CN114522538A - Boiler flue gas desulfurization system and desulfurization method - Google Patents
Boiler flue gas desulfurization system and desulfurization method Download PDFInfo
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- CN114522538A CN114522538A CN202210274216.1A CN202210274216A CN114522538A CN 114522538 A CN114522538 A CN 114522538A CN 202210274216 A CN202210274216 A CN 202210274216A CN 114522538 A CN114522538 A CN 114522538A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 136
- 230000023556 desulfurization Effects 0.000 title claims abstract description 136
- 239000003546 flue gas Substances 0.000 title claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008929 regeneration Effects 0.000 claims abstract description 88
- 238000011069 regeneration method Methods 0.000 claims abstract description 88
- 239000000243 solution Substances 0.000 claims abstract description 76
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000003860 storage Methods 0.000 claims abstract description 32
- 238000001556 precipitation Methods 0.000 claims abstract description 30
- 239000007921 spray Substances 0.000 claims abstract description 24
- 239000012492 regenerant Substances 0.000 claims abstract description 20
- 239000011550 stock solution Substances 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 3
- 239000010959 steel Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 67
- 239000012535 impurity Substances 0.000 claims description 35
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 19
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 18
- 239000000779 smoke Substances 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 4
- 230000001172 regenerating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 14
- 238000004064 recycling Methods 0.000 abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 54
- 239000000047 product Substances 0.000 description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 7
- 239000010440 gypsum Substances 0.000 description 7
- 229910052602 gypsum Inorganic materials 0.000 description 7
- 229910052938 sodium sulfate Inorganic materials 0.000 description 7
- 235000011152 sodium sulphate Nutrition 0.000 description 7
- 239000003245 coal Substances 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- General Chemical & Material Sciences (AREA)
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Abstract
The application relates to a boiler flue gas desulfurization system and a desulfurization method, which comprises a desulfurization tower, a desulfurization component and a regeneration component, wherein the desulfurization component and the regeneration component are arranged on the desulfurization tower; the desulfurization component can spray a desulfurizing agent solution in the desulfurization tower, the regeneration component comprises a liquid storage tank, a regeneration tank, a precipitation tank, a sieve tube and a stock solution tank, and the liquid storage tank 5 is communicated with the desulfurization tower and is used for collecting a desulfurization product solution; the regeneration tank is communicated with the liquid storage tank 5 and is used for introducing a regenerant solution; the settling tank is communicated with the regeneration tank and is used for introducing the regenerated product; the inner cavity of the sieve tube is filled with steel wire meshes, the two ends of the sieve tube are respectively communicated with the stock solution tank and the precipitation tank, and the two ends of the sieve tube are respectively provided with a sieve. The method and the device can reduce the conditions of pipeline scaling, nozzle blockage and the like in the recycling process, so that the desulfurizer is sprayed more smoothly, and the desulfurization effect of the flue gas is ensured.
Description
Technical Field
The application relates to the technical field of boiler flue gas treatment, in particular to a boiler flue gas desulfurization system and a desulfurization method.
Background
The boiler is an energy converter, which is a device for heating working medium water or other fluids to certain parameters by using heat energy released by fuel combustion or other heat energy. Coal is the most important natural energy in China, and is used as the second major coal field in China, coal coking is one of the main pollution sources in the industrial coal field, acid gas is generated by combustion of coal and is discharged into the atmosphere to cause air pollution, haze, acid rain, photochemical smog and the like, so that human health is harmed, and therefore, flue gas is required to be subjected to desulfurization treatment.
Flue gas desulfurization refers to the removal of sulfur oxides from flue gases or other industrial waste gases, and a commonly used desulfurization method is a double-alkali method using two basic substances, sodium hydroxide and lime. The desulfurizing tower is tower equipment for desulfurizing industrial waste gas, a spray gun is installed in the desulfurizing tower, a prepared sodium hydroxide solution is directly pumped into the spray gun and sprayed into the desulfurizing tower along the spray gun by using the sodium hydroxide solution as a desulfurizing agent, the flue gas rises along the desulfurizing tower to react with sulfur dioxide sprayed by the spray gun to form a solution and fall down, and finally, a desulfurization product is reduced into sodium hydroxide by using lime as a regenerant and then is pumped back into the desulfurizing tower for recycling, so that desulfurization is realized.
In view of the above-mentioned related technologies, the inventor believes that the desulfurizing agent generates gypsum in the regeneration process, and may cause the conditions of pipe scaling, nozzle blockage and the like in the recycling process, and further, the spraying of the desulfurizing agent solution in the tower is blocked, which affects the desulfurizing effect.
Disclosure of Invention
In order to ensure that a desulfurizer is sprayed more smoothly and the desulfurization effect of flue gas is ensured, the application provides a boiler flue gas desulfurization system and a desulfurization method.
In a first aspect, the present application provides a boiler flue gas desulfurization system, which adopts the following technical scheme:
a boiler flue gas desulfurization system comprises a desulfurization tower, a desulfurization assembly and a regeneration assembly, wherein the desulfurization assembly and the regeneration assembly are arranged on the desulfurization tower; the desulfurization component can spray a desulfurizing agent solution in the desulfurization tower, the regeneration component comprises a liquid storage tank, a regeneration tank, a precipitation tank, a sieve tube and a stock solution tank, and the liquid storage tank is communicated with the desulfurization tower and is used for collecting a desulfurization product solution; the regeneration tank is communicated with the liquid storage tank and is used for introducing a regenerant solution; the settling tank is communicated with the regeneration tank and is used for introducing the regenerated product; the inner cavity of the sieve tube is filled with steel wire meshes, the two ends of the sieve tube are respectively communicated with the stock solution tank and the precipitation tank, and the two ends of the sieve tube are respectively provided with a sieve mesh.
By adopting the technical scheme, after flue gas generated by boiler combustion enters the desulfurizing tower, the flue gas rises along the desulfurizing tower, a desulfurizing agent solution is sprayed into the desulfurizing tower through the desulfurizing component, the flue gas reacts with sulfur dioxide in the flue gas and falls to the bottom of the tower together with impurities adhered with water vapor in the flue gas, and the rest flue gas is continuously discharged; the desulfurization product enters a liquid storage tank from the desulfurization tower for storage, then is continuously introduced into a regeneration tank to react with a regenerant in the regeneration tank to form a desulfurizing agent and partial precipitate, then the regeneration product is introduced into a precipitation tank for precipitation, and then the desulfurizing agent after precipitation is introduced into the desulfurization tower through a desulfurization assembly through a sieve tube for desulfurization, so that the recycling of the desulfurizing agent is completed; the liquid storage tank, the regeneration tank and the precipitation tank are arranged, so that the states of storage, regeneration and separation of the desulfurization product can be separated, the mixing of the desulfurization product and the regenerated product is reduced, and the purity of the regenerated desulfurizer is ensured; the screen pipe that sets up can be so that the in-process that gets into former cistern passes through stricter screening, and the impurity that the flow in former cistern that significantly reduces avoids gypsum scale deposit to block up in the pipeline for spraying of desulfurizer keeps smoothly, and then improves the desulfurization effect of flue gas.
Optionally, an impurity box communicated with the sieve tube is arranged between the two ends of the sieve tube, the two ends of the sieve tube are higher than the middle part of the sieve tube, the impurity box is arranged at the lowest position of the sieve tube, and the sieve tube is led in along the bottom wall of the stock solution tank.
Through adopting above-mentioned technical scheme, the impurity case that sets up for the desulfurizer in the thing of producing again gets into the impurity case along the screen pipe, and blocks another regeneration precipitation result at the in-process that passes through, and the desulfurizer rises gradually in the impurity case, and goes into former cistern along the screen pipe with the mode of overflowing, further reduces the impurity that gets into former cistern, guarantees the unobstructed of hydrojet pipeline.
Optionally, the precipitation tank includes material passing area and at least two independent material placing areas side by side, and the material passing area sets up in a plurality of material placing area both sides to put the material zone intercommunication with a plurality of simultaneously, regeneration tank and arbitrary material passing area intercommunication, another material passing area and screen pipe intercommunication, material placing area is provided with the ooff valve, and can be right material placing area seals or opens with the passageway in material passing area.
Through adopting above-mentioned technical scheme, the logical material district that sets up with put the material district, can produce the thing again at a batch volume and carry out the in-process that deposits, through leading to the material district, let in next batch volume reproduction thing in addition and put the material district and deposit, each other not influence to make the product after the filtration converge the discharge in another logical material district, avoid adding material to cause the continuous muddy situation of reproduction thing in the sedimentation process many times, guarantee the precipitation effect.
Optionally, all be provided with the liquid level measurement appearance in regeneration tank and the reservoir, communicate through the reaction tube between regeneration tank and the reservoir, be provided with the reaction pump on the reaction tube, the material end that adds of regeneration tank is provided with adds the material pump.
By adopting the technical scheme, when the regenerant in the regeneration tank is less than a certain liquid level, the feeding pump feeds the material into the regeneration tank until the material exceeds the specified liquid level, the feeding is stopped after the desulfurization product in the liquid storage tank reaches a certain liquid level, and the desulfurization product in the liquid storage tank is fed into the regeneration tank through the reaction pump for reaction; the liquid level measurement appearance that sets up for the volume of the desulfurization product in the control regeneration tank and regenerant and reservoir, and then make desulfurization product and regenerant in the reaction tank can fully react, reduce the waste of raw materials simultaneously, improve the effect and the efficiency of reaction.
Optionally, be provided with stirring rake and agitator motor on the regeneration tank, the stirring rake rotates to be connected regeneration tank inner chamber, agitator motor is used for driving the stirring rake rotates.
Through adopting above-mentioned technical scheme, stirring rake and the agitator motor of setting drive the stirring rake through agitator motor and rotate, and the contact of desulfurization product and regenerant in the increase reaction tank, and then make both fully react, improve reaction efficiency and reaction effect.
Optionally, the desulfurization subassembly includes injection pipe and a plurality of atomizer, the injection pipe is including adding the material section and spraying the section, the setting of spraying the section is at the desulfurizing tower inner wall and is encircleed the desulfurizing tower setting, the atomizer evenly set up in the spraying section and with spray the section intercommunication.
Through adopting above-mentioned technical scheme, the injection pipe and the atomizer of setting, the injection section is around setting up at the desulfurizing tower inner wall along circumference, can make atomizer cover whole desulfurizing tower inner chamber, and the desulfurizer of being convenient for covers the desulfurizing tower cross-section for the desulfurizer fully contacts and reacts with the sulfur dioxide in the flue gas, improves the desulfurization effect of flue gas.
Optionally, the spraying section is spirally arranged along the height direction of the desulfurizing tower, and the spraying sections are adjacent along the height direction and the spraying directions of the atomizing nozzles are staggered.
Through adopting above-mentioned technical scheme, the spiral helicine injection section that sets up forms the multilayer spraying on the injection tower height, and the certain region that sprays that forms for the flue gas continuously receives at the in-process that rises and sprays, and atomizer staggers the setting simultaneously, makes spun desulfurizer spray distribution more even, further improves the desulfurization effect of boiler flue gas.
Optionally, the desulfurizing tower inner chamber is provided with solution chamber, sieve, desulfurization section and exhaust section from bottom to top, the sieve sets up to the back taper, the sieve bottom be provided with the blow off pipe of desulfurization section intercommunication, the blow off pipe other end passes the solution chamber and wears out the desulfurizing tower sets up, be provided with the blowoff valve on the blow off pipe.
By adopting the technical scheme, a desulfurization product generated by the reaction of the desulfurizer solution and sulfur dioxide in the flue gas falls onto the sieve plate, impurities falling along with water flow fall onto the sieve plate, and the rest solution falls into the solution cavity and is retained; the sieve and the blowoff valve that set up can carry out the first time screening to the desulfurization product in the desulfurizing tower, filters impurity wherein, are convenient for follow-up and regenerant reaction, reduce impurity, the collection and the recycle of the gypsum deposit of the follow-up generation of being convenient for.
Optionally, a plurality of smoke outlets are formed in the desulfurizing tower, the smoke outlets are communicated with the chimney through smoke exhaust pipes, the exhaust section is provided with a water-gas separator, and the smoke exhaust pipes are provided with exhaust fans.
Through adopting above-mentioned technical scheme, the moisture separator that sets up separates remaining vapor and gas in the flue gas, and the gas outgoing of being convenient for reduces the corruption of vapor to the chimney.
In a second aspect, the present application provides a desulfurization method for a boiler flue gas desulfurization system, which adopts the following technical scheme:
a desulfurization method of a boiler flue gas desulfurization system comprises the following steps:
s1: flue gas enters a desulfurizing tower from a boiler and rises from bottom to top;
s2: and (3) desulfurization: the desulfurization component sprays a desulfurizer solution into the tower, sulfur dioxide and impurities in the adsorbed flue gas fall to the bottom of the tower to be collected, and the residual flue gas continuously rises and is discharged;
s3: introducing the solution in the desulfurization product into a liquid storage tank and storing the solution to a certain amount;
s4: and (3) regeneration of a desulfurizing agent: introducing the desulfurization product in the liquid storage tank into a regeneration tank, and reacting with a regenerant in the regeneration tank to regenerate the desulfurizer;
s5: introducing the regenerated product into a settling tank for settling;
s6: and introducing the desulfurizer in the precipitated re-production product into a stock solution tank through a sieve tube for collection, and spraying the desulfurizer in the stock solution tank into the desulfurizing tower again through a desulfurizing component to realize circulation.
Through adopting above-mentioned technical scheme, the desulfurization product, regenerant and regeneration product pass through the reservoir, regeneration tank and precipitation tank are independently placed and the pay-off, reduce the mixture of various solutions, regenerated desulfurizer gets into former cistern storage after precipitating through the precipitation tank and collects, so that recycle, the material of sediment also can continue to collect and continue to utilize, whole desulfurization and regeneration process, the situation that various different solutions that the increase has reduced and have produced the mixture, obtain comparatively pure desulfurizer former liquid and continue cyclic utilization, not only protect whole equipment that sprays, the desulfurization effect of flue gas has also been improved simultaneously.
In summary, the present application includes at least one of the following beneficial technical effects:
the liquid storage tank, the regeneration tank and the precipitation tank are arranged, so that the states of storage, regeneration and separation of the desulfurization product can be separated, the mixing of the desulfurization product and the regenerated product is reduced, and the purity of the regenerated desulfurizer is ensured; the sieve tube can be used for carrying out stricter screening in the process of entering the raw liquid tank, so that impurities flowing into the raw liquid tank are greatly reduced, the gypsum is prevented from scaling and blocking in a pipeline, the spraying of a desulfurizer is kept smooth, and the desulfurization effect of flue gas is improved;
the feeding area and the material placing area are arranged in the precipitation tank, so that the next batch of regenerated products can be fed into the other material placing area for precipitation through the feeding area in the process of precipitating a batch of regenerated products, the precipitation is not influenced mutually, the filtered products are converged and discharged in the other feeding area, the condition that the regenerated products are continuously turbid due to repeated feeding in the precipitation process is avoided, and the precipitation effect is ensured;
by adopting the desulfurization method, the desulfurization product, the regenerant and the regeneration product pass through the liquid storage tank, the regeneration tank and the precipitation tank are independently placed and fed, the mixing of various solutions is reduced, the regenerated desulfurizer is precipitated through the precipitation tank and then enters the stock solution tank for storage and collection, so that the desulfurizer can be recycled, the precipitated substance can be continuously collected and continuously utilized, the whole desulfurization and regeneration process is realized, the condition that various different solutions are mixed is increased and reduced, the pure desulfurizer stock solution is continuously recycled, the whole spraying equipment is protected, and the desulfurization effect of flue gas is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a boiler flue gas desulfurization system according to an embodiment of the present application.
Fig. 2 is a sectional view of fig. 1.
Fig. 3 is a schematic view of the interior of the sink tank.
Description of reference numerals: 1. a desulfurizing tower; 11. a solution chamber; 12. a sieve plate; 13. a desulfurization section; 14. an exhaust section; 15. a blow-off pipe; 16. a water-gas separator; 17. a smoke exhaust pipe; 18. an exhaust fan; 2. a chimney; 3. an injection pipe; 31. a material adding section; 32. a spraying section; 4. an atomizing spray head; 5. a liquid storage tank; 51. a feed pump; 52. a reaction tube; 53. a reaction pump; 6. a regeneration tank; 61. a feeding pipe; 62. a feeding pump; 63. a liquid level meter; 64. a stirring paddle; 65. a stirring motor; 7. a settling tank; 71. a material passing area; 72. a material placing area; 73. a screen pipe; 74. a pressure pump; 8. an impurity box; 9. a stock solution tank; 91. a circulation pipe; 92. and a circulating pump.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a boiler flue gas desulfurization system. Referring to fig. 1, the boiler flue gas desulfurization system comprises a desulfurization tower 1, a desulfurization assembly and a regeneration assembly which are arranged on the desulfurization tower 1, wherein a smoke inlet of the desulfurization tower 1 is communicated with a smoke pipe of a boiler, and a smoke outlet of the desulfurization tower 1 is arranged on the top wall and is communicated with a chimney 2; the desulfurization subassembly can spray desulfurizer solution in desulfurizing tower 1, and sodium hydroxide solution is selected to this application desulfurizer solution.
Referring to fig. 2, a solution cavity 11, a sieve plate 12, a desulfurization section 13 and an exhaust section 14 are arranged in an inner cavity of a desulfurization tower 1 from bottom to top, the sieve plate 12 is in an inverted cone shape, the bottom of the sieve plate 12 is connected with a sewage discharge pipe 15 communicated with the desulfurization section 13 in a coaxial flange manner, and the other end of the sewage discharge pipe 15 vertically penetrates through the solution cavity 11 and penetrates out of the desulfurization tower 1; the solid particle impurity in the flue gas gravity under the steam effect increases to on the desulfurization result whereabouts to sieve 12, flange joint has the blowoff valve on the blow off pipe 15, and blow off pipe 15 is used for regularly discharging the impurity that accumulates on the sieve 12.
Referring to fig. 2, the desulfurization assembly is arranged in the desulfurization section 13, and includes a spray pipe 3 and a plurality of atomizer nozzles 4, the spray pipe 3 includes an integrally arranged feeding section 31 and a spray section 32, and the feeding section 31 penetrates out of the desulfurization tower 1 for feeding sodium hydroxide solution; the injection section 32 is fixed on the inner wall of the desulfurizing tower 1 through bolts, and the injection section 32 is spirally arranged along the height direction of the desulfurizing tower 1 and is coaxially arranged with the desulfurizing tower 1; the plurality of atomizing spray heads 4 are circumferentially distributed along the desulfurization tower 1, are uniformly welded on the spraying section 32 and are communicated with the spraying section 32, and are arranged in a staggered mode along the spraying directions of the atomizing spray heads 4 on the spraying sections 32 adjacent to each other in the height direction.
Referring to fig. 2, a water-gas separator 16 is installed at the exhaust end, water vapor in the residual flue gas is collected and discharged separately, a plurality of exhaust ports are formed in the top of the desulfurization tower 1, a flue gas exhaust pipe 17 is connected to the position of each exhaust port in a flange mode and communicated with the chimney 2 through the flue gas exhaust pipe 17, and an exhaust fan 18 is installed at one end, communicated with the chimney 2, of the flue gas exhaust pipe 17 and used for exhausting the flue gas in the flue gas exhaust pipe 17.
Referring to fig. 2, the regeneration assembly comprises a liquid storage tank 5, a regeneration tank 6, a precipitation tank 7, a sieve pipe 73, an impurity box 8 and a stock solution tank 9, wherein the liquid storage tank 5 is communicated with a solution cavity 11 of the desulfurizing tower 1 through a pipeline, and a feeding pump 51 is connected to the pipeline through a flange; connect through reaction tube 52 between regeneration tank 6 and the reservoir 5, and reaction tube 52 is close to reservoir 5 inner chamber bottom parallel and level, and flange joint has reaction pump 53 on the reaction tube 52, and flange mounting and intercommunication have material adding pipe 61 on the regeneration tank 6, and flange joint has material adding pump 62 on the material adding pipe 61 for add regenerant solution in the regeneration tank 6, this application regenerant solution adopts calcium hydroxide solution. The regeneration tank 6 pumps the regenerated product to the precipitation tank 7 through a pipe and a water pump. All install level measurement appearance 63 in regeneration tank 6 and the reservoir 5 to the volume of solution in the control regeneration tank 6, inject a quantitative desulfurization product sodium sulfate solution into reservoir 5 through feed pump 51, inject a quantitative calcium hydroxide solution into regeneration tank 6 through adding material pump 62, let in the sodium sulfate solution through reaction pump 53 at last and react with the calcium hydroxide solution in regeneration tank 6, be convenient for divide batch to react, improve the regeneration efficiency of sodium hydroxide.
Referring to fig. 2, a stirring paddle 64 and a stirring motor 65 are arranged on the regeneration tank 6, the stirring paddle 64 is horizontally and rotatably connected to the inner cavity of the regeneration tank 6, the stirring motor 65 is fixed on the outer wall of the regeneration tank 6 through a bolt, and an output shaft of the stirring motor 65 is connected with one end of the stirring paddle 64 through a coaxial key.
Referring to fig. 3, the settling tank 7 includes a material passing area 71 and three material placing areas 72 which are independent side by side, the material passing area 71 is arranged on two sides of the material placing areas 72 and is communicated with the material placing areas 72, the bottom of the regeneration tank 6 is communicated with any material passing area 71 through a pipeline, the other material passing area 71 is communicated with a sieve pipe 73, the material placing areas 72 are provided with through pipes which are communicated with the material placing areas 72 and the material passing areas 71 at positions close to the two material passing areas 71, and opening and closing valves are arranged on the through pipes to close or open the through pipes.
Referring to fig. 3, the sieve tube 73 is arranged in a V shape, two ends of the sieve tube 73 are respectively communicated with the stock solution tank 9 and the material passing area 71, the middle of the sieve tube 73 is low, two ends of the sieve tube 73 are high, and the impurity box 8 is arranged at the lowest position of the sieve tube 73 and is communicated with the sieve tube 73; the inner cavity of the impurity box 8 is divided into two parts by a partition plate, and the bottom of the material placing area 72 is communicated with a part of the impurity box 8, which is far away from the sieve tube 73. Be provided with force pump 74 on the screen pipe 73 between logical material district 71 and impurity case 8, the screen pipe 73 inner chamber is filled through the wire net, can filter the solution that passes through screen pipe 73, and the screen pipe 73 lets in and leads to both ends of expecting district 71 and former liquid tank 9 and all have the screen cloth through the flange, and can change regularly. The raw liquid tank 9 is communicated with the injection section 32 of the injection pipe 3 through a circulating pipe 91, and a circulating pump 92 is connected to the circulating pipe 91 in a flange manner and supplies regenerated sodium hydroxide solution to the injection section 32.
The implementation principle of the boiler flue gas desulfurization system in the embodiment of the application is as follows: after flue gas generated by boiler combustion enters the desulfurizing tower 1, the flue gas rises along the desulfurizing tower 1, and the added sodium hydroxide solution enters the spraying section 32 in the desulfurizing tower 1 along the feeding section 31 of the spraying pipe 3, is atomized under the action of the atomizing spray head 4 and is sprayed in the desulfurizing tower 1; the flue gas is ascending to the in-process that passes injection section 32 and is continuously received and sprays, and sodium hydroxide solution reacts with the sulfur dioxide in the flue gas and generates sodium sulfate solution, and the desulfurization product falls to sieve 12 with the impurity of adhesion steam simultaneously in the flue gas on, falls on sieve 12 along with the impurity of solution whereabouts, and along blow off pipe 15 discharges behind certain stock volume, sodium sulfate solution falls to and remains in solution chamber 11. And the rest of the flue gas continuously rises, the residual water vapor in the flue gas is separated from the gas through the water-gas separator 16, and the dried gas enters the chimney 2 along the smoke exhaust pipe 17 until being exhausted, so that the desulfurization of the boiler flue gas is completed.
When the regenerant in the regeneration tank 6 is less than a certain liquid level, feeding the regenerant to the regeneration tank 6 to exceed the specified liquid level of the liquid level meter 63 through the feeding pump 62; a certain amount of sodium sulfate solution as a desulfurization product is injected into the liquid storage tank 5 through the feeding pump 51 until the specified liquid level of the liquid level measuring instrument 63 is reached, the feeding is stopped, the desulfurization product in the liquid storage tank 5 is introduced into the regeneration tank 6 through the reaction pump 53 to react, the stirring motor 65 is started to drive the stirring paddle 64 to rotate, the solution in the regeneration tank 6 is driven to be better mixed, the sodium hydroxide solution is regenerated again, and the precipitate of the gypsum is generated.
Pumping the regeneration product in the regeneration tank 6 to the material passing area 71, simultaneously opening any vacant opening and closing valve, enabling the regeneration product to enter the material placing area 72 for precipitation, enabling the solution after precipitation to enter the other material passing area 71, screening the solution through a screen pipe 73, enabling the solution to flow along the screen pipe 73 to enter the impurity box 8, collecting the solution in the impurity box 8, gradually overflowing the impurity box 8, enabling the solution to enter the raw liquid tank 9 along the screen pipe 73 on the other side, and collecting the solution, wherein the sodium hydroxide solution in the raw liquid tank 9 is finally pumped into the injection section 32 of the injection pipe 3 through a circulating pipe 91 and a circulating pump 92, so that the recycling of the desulfurizer is completed.
The embodiment of the application also discloses a desulfurization method of the boiler flue gas desulfurization system, referring to fig. 2, the boiler flue gas desulfurization system comprises the following steps:
s1: the boiler burns to generate flue gas, and the flue gas enters the desulfurizing tower 1 from the boiler and rises from bottom to top along the height direction of the desulfurizing tower 1;
s2: and (3) desulfurization: the desulfurization component sprays a desulfurizer solution into the tower, sulfur dioxide and impurities in the adsorbed flue gas fall to the bottom of the tower to be collected, and the residual flue gas continuously rises and is discharged;
s11: the added sodium hydroxide solution enters a spraying section 32 in the desulfurizing tower 1 through a material adding section 31 of a spraying pipe 3, an atomizing nozzle 4 is opened, the solution is atomized and sprayed in the desulfurizing tower 1, and the flue gas is continuously sprayed in the process of rising to pass through the spraying section 32 to absorb sulfur dioxide to generate a sodium sulfate solution;
s12: impurities which are simultaneously adhered with water vapor in the desulfurization product and the flue gas fall onto the sieve plate 12, the impurities falling along with the solution fall onto the sieve plate, the sodium sulfate solution falls into the solution cavity 11 for retention, the rest flue gas continuously rises, the rest water vapor in the flue gas is separated from the gas through the water-gas separator 16, and the dried gas enters the chimney 2 along the smoke exhaust pipe 17 until being exhausted;
s3: starting the feeding pump 51, introducing the desulfurization product into the liquid storage tank 5, and stopping introducing the desulfurization product until the desulfurization product reaches the specified liquid level of the liquid level measuring instrument 63;
s4: and (3) regeneration of a desulfurizing agent: introducing the desulfurization product in the liquid storage tank 5 into the regeneration tank 6, and reacting with the regenerant in the regeneration tank 6 to regenerate the desulfurizer;
s41: when the regenerant in the regeneration tank 6 is less than a certain liquid level, starting the feeding pump 62, and adding the calcium hydroxide solution into the regeneration tank 6 until the specified liquid level of the liquid level meter 63 is exceeded;
s42: starting a reaction pump, introducing the desulfurization product in the liquid storage tank 5 into a regeneration tank, starting a stirring motor to drive the solution in the regeneration tank to mix, regenerating a sodium hydroxide solution, and generating a precipitate of gypsum;
s5: pumping the sodium hydroxide solution and gypsum regenerated in the regeneration tank into a material passing area, opening an opening and closing valve of any empty material placing area, allowing the regenerated product to enter the material placing area for precipitation, allowing the regenerated product in the next batch of regeneration tank to enter another material placing area for precipitation, and allowing the solution after precipitation to enter another material passing area;
s6: the sodium hydroxide solution is screened by the sieve tube and flows along the sieve tube to enter the impurity box, is collected in the impurity box, gradually rises in the liquid level to overflow the impurity box, enters the stock solution tank along the sieve tube on the other side to be collected, starts the circulating pump, pumps the sodium hydroxide solution in the stock solution tank into the injection section of the injection pipe through the circulating pipe, and injects the sodium hydroxide solution into the desulfurizing tower to complete the recycling of the desulfurizing agent.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A boiler flue gas desulfurization system which characterized in that: the device comprises a desulfurizing tower (1), and a desulfurizing assembly and a regenerating assembly which are arranged on the desulfurizing tower (1), wherein a smoke inlet of the desulfurizing tower (1) is communicated with a smoke tube of a boiler, and a smoke outlet of the desulfurizing tower (1) is arranged on the top wall and is communicated with a chimney (2); the desulfurization component can spray a desulfurizing agent solution in the desulfurization tower (1), the regeneration component comprises a liquid storage tank (5), a regeneration tank (6), a precipitation tank (7), a sieve tube (73) and a stock solution tank (9), and the liquid storage tank (5) is communicated with the desulfurization tower (1) and is used for collecting a desulfurization product solution; the regeneration tank (6) is communicated with the liquid storage tank (5) and is used for introducing a regenerant solution; the settling tank (7) is communicated with the regeneration tank (6) and is used for introducing a regeneration product; the inner cavity of the sieve tube (73) is filled with steel wire meshes, the two ends of the sieve tube (73) are respectively communicated with the stock solution tank (9) and the precipitation tank (7), and the two ends of the sieve tube (73) are respectively provided with a sieve mesh.
2. The boiler flue gas desulfurization system of claim 1, characterized in that: an impurity box (8) communicated with the sieve tube (73) is arranged between the two ends of the sieve tube (73), the two ends of the sieve tube (73) are higher than the middle part, the impurity box (8) is arranged at the lowest position of the sieve tube (73), and the sieve tube (73) is communicated with the bottom wall of the raw liquid tank (9).
3. The boiler flue gas desulfurization system of claim 1, characterized in that: the settling tank (7) comprises a material passing area (71) and at least two material placing areas (72) which are independent side by side, the material passing areas (71) are arranged on two sides of the material placing areas (72) and are communicated with the material placing areas (72) simultaneously, the regeneration tank (6) is communicated with any material passing area (71), the other material passing area (71) is communicated with a sieve pipe (73), and the material placing areas (72) are provided with switch valves and can be closed or opened to channels of the material placing areas (72) and the material passing areas (71).
4. The boiler flue gas desulfurization system of claim 1, characterized in that: all be provided with liquid level measurement appearance (63) in regeneration tank (6) and reservoir (5), communicate through reaction tube (52) between regeneration tank (6) and reservoir (5), be provided with reaction pump (53) on reaction tube (52), the material end of adding of regeneration tank (6) is provided with and adds material pump (62).
5. The boiler flue gas desulfurization system of claim 1, characterized in that: be provided with stirring rake (64) and agitator motor (65) on regeneration tank (6), stirring rake (64) rotate to be connected regeneration tank (6) inner chamber, agitator motor (65) are used for driving stirring rake (64) rotate.
6. The boiler flue gas desulfurization system of claim 1, characterized in that: desulfurization subassembly includes injection pipe (3) and a plurality of atomizer (4), injection pipe (3) are including adding material section (31) and injection section (32), injection section (32) set up at desulfurizing tower (1) inner wall and encircle desulfurizing tower (1) setting, atomizer (4) evenly set up in injection section (32) and with injection section (32) intercommunication.
7. The boiler flue gas desulfurization system of claim 6, characterized in that: the injection section (32) is spirally arranged along the height direction of the desulfurizing tower (1), and the injection section (32) is adjacent along the height direction and the injection directions of the atomizing nozzles (4) are staggered.
8. The boiler flue gas desulfurization system of claim 1, characterized in that: the desulfurization tower (1) inner chamber is provided with solution chamber (11), sieve (12), desulfurization section (13) and exhaust section (14) from bottom to top, sieve (12) set up to the back taper, sieve (12) bottom be provided with blow off pipe (15) of desulfurization section (13) intercommunication, blow off pipe (15) other end is passed solution chamber (11) is worn out desulfurization tower (1) sets up, be provided with the blowoff valve on blow off pipe (15).
9. The boiler flue gas desulfurization system of claim 8, wherein: the desulfurization tower (1) is provided with a plurality of smoke outlets, the smoke outlets are communicated with the chimney (2) through smoke exhaust pipes (17), the exhaust section (14) is provided with a water-gas separator (16), and the smoke exhaust pipes (17) are provided with exhaust fans (18).
10. A desulfurization method of a boiler flue gas desulfurization system is characterized in that: use of a boiler flue gas desulfurization system according to any one of claims 1 to 9, comprising the steps of:
s1: flue gas enters a desulfurizing tower (1) from a boiler and rises from bottom to top;
s2: and (3) desulfurization: the desulfurization component sprays a desulfurizer solution into the tower, sulfur dioxide and impurities in the adsorbed flue gas fall to the bottom of the tower to be collected, and the residual flue gas continuously rises and is discharged;
s3: introducing the solution in the desulfurization product into a liquid storage tank (5) and storing the solution to a certain amount;
s4: and (3) regeneration of a desulfurizing agent: introducing the desulfurization product in the liquid storage tank (5) into the regeneration tank (6), and reacting with the regenerant in the regeneration tank (6) to regenerate the desulfurizer;
s5: introducing the regenerated product into a settling tank for settling;
s6: and (3) introducing the desulfurizer in the precipitated regeneration product into the raw liquid tank (9) through a sieve tube (73) for collection, and spraying the desulfurizer in the raw liquid tank (9) into the desulfurizing tower (1) again through a desulfurizing component to realize circulation.
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| CN202210274216.1A CN114522538A (en) | 2022-03-21 | 2022-03-21 | Boiler flue gas desulfurization system and desulfurization method |
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| CN215208825U (en) * | 2020-12-29 | 2021-12-17 | 徐州美斯特建材有限公司 | Waste water treatment device for stone processing |
| CN215233270U (en) * | 2021-06-23 | 2021-12-21 | 山东中禹环境工程有限公司 | Semi-dry desulfurization device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101502754A (en) * | 2009-02-09 | 2009-08-12 | 河南省泰隆科技开发应用有限公司 | Dual alkali desulphurization energy-saving technique |
| CN203593718U (en) * | 2013-09-26 | 2014-05-14 | 颍上县天好食品有限公司 | Stirring and water circulating system with communicated starch sedimentation tanks |
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