CN212440755U - High-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system - Google Patents
High-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system Download PDFInfo
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- CN212440755U CN212440755U CN202021840416.1U CN202021840416U CN212440755U CN 212440755 U CN212440755 U CN 212440755U CN 202021840416 U CN202021840416 U CN 202021840416U CN 212440755 U CN212440755 U CN 212440755U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 239000003546 flue gas Substances 0.000 title claims abstract description 92
- 239000002918 waste heat Substances 0.000 title claims abstract description 59
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 title claims abstract 12
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 66
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052740 iodine Inorganic materials 0.000 claims description 3
- 239000011630 iodine Substances 0.000 claims description 3
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- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
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- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 2
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Classifications
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Treating Waste Gases (AREA)
Abstract
The utility model discloses a high-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system, include dry process deacidification tower along flue gas flow direction in proper order, waste heat recovery heat exchanger, connect the flue, the sack cleaner, draught fan and chimney, the other feeder who supplies with the baking soda that is connected with of cominging in and going out of dry process deacidification tower, waste heat recovery heat exchanger's medium entry passes through the boiler and feeds water the pump and links to each other with boiler oxygen-eliminating device, the medium exit linkage has exhaust-heat boiler, be connected with the second feeder who is used for spouting into active carbon powder on the connection flue. After high-temperature flue gas generated by waste incineration is treated, SO in the flue gas can be efficiently removed3、SO2Pollutants such as HCl and dioxin can be cooled by the flue gas without water spraying, corrosion of flue gas condensation on a dust remover and bag pasting risks are reduced, visual pollution cannot be caused when the temperature of the discharged flue gas is above a dew point, and finally, waste heat utilization of the flue gas system is realized, and the purposes of energy conservation and emission reduction are achieved.
Description
Technical Field
The utility model belongs to the environmental protection equipment field, concretely relates to high-efficient deacidification of flue gas, take off dioxin and waste heat utilization system in coordination.
Background
The incineration process of solid waste and hazardous waste can generate smoke, and the smoke is a mixture of gas and smoke dust. The composition is complex and includes various pollutants such as sulfur trioxide, sulfur dioxide, hydrogen chloride, carbon monoxide, nitrogen oxides, hydrocarbons and dioxins. The smoke dust contains fuel ash, unburned oil droplets, high-temperature cracking products and the like, and the smoke gas contains a large amount of water vapor. The generation and discharge of these substances have become the most limiting factors in the promotion of waste incineration disposal technology.
At present, the treatment of incineration flue gas of waste generally comprises four parts of denitration, deacidification, dioxin removal, dust removal and the like, wherein the deacidification and dioxin removal parts are difficult points in flue gas treatment, and the low-temperature acid corrosion of system equipment is prevented from being pain points in the flue gas treatment.
The method mainly adopts a powdered activated carbon adsorption process for removing dioxin from flue gas, the efficiency of adsorbing dioxin by activated carbon is reduced along with the rise of the temperature of the flue gas, and the adsorption effect is sharply reduced when the temperature of the flue gas exceeds 170 ℃; the traditional process generally adopts water spray to cool flue gas, but the risk of bag pasting and dew formation corrosion of the bag-type dust remover is aggravated by spraying a large amount of water into the flue gas, and the actual flue gas amount of the dust remover is increased by spraying water.
Chinese patent CN1120955C, entitled "method for treating dioxin in waste incineration exhaust gas" discloses a method for adsorbing dioxin in flue gas by spraying powdered activated carbon, which is used for recycling and incinerating the dioxin-adsorbing activated carbon. Chinese patent "dioxin activated carbon adsorption device" with application number CN106422661A discloses a vertical activated carbon adsorption tank for removing dioxin. However, the above two patents do not relate to the optimum working temperature of activated carbon for adsorbing dioxin, and do not describe corresponding temperature control methods.
The traditional external deacidification process comprises a calcium agent dry method, a calcium agent semi-dry method, a calcium agent wet method or a sodium agent wet method and the like. The deacidification efficiency by the wet method is high, but new pollutant waste water is generated, a waste water disposal system is needed, the wet method has serious corrosion to subsequent equipment, and a large amount of aerosol is contained in the smoke discharged by a chimney; the calcium agent dry method generally adopts slaked lime as deacidification agent, but the molar volume of the slaked lime reaction product is highly expanded, and the product CaSO3Etc. can quickly plug the reactant surfaces and channels, leading to intraparticle cloggingThe utilization rate of the part is very low, so the deacidification efficiency is generally not more than 50 percent; a large amount of water is added into the calcium agent semi-dry deacidification flue gas, so that the risks of bag pasting and dew formation corrosion of the bag-type dust remover are increased; and generally, for burning high-sulfur or high-chlorine wastes, the stable standard-reaching discharge of acid pollutants is difficult to ensure by singly setting a semidry deacidification method.
Chinese patent No. CN108114591A, "a flue gas treatment method", discloses a treatment process for synchronous desulfurization and denitrification by using sodium bicarbonate powder, wherein the sodium bicarbonate powder and nitrogen oxides and sulfur oxides in flue gas undergo chemical reaction at 120-200 ℃ to remove nitrogen oxides and sulfur oxides, but the bag-type dust remover disclosed by the patent is placed at the front end of the desulfurization and denitrification process, and is discharged by washing, which obviously cannot meet the requirement of standard emission of particulate pollutants in flue gas, and the applicability of practical engineering is not strong.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a high-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system to solve the problem that the calcium agent dry process deacidification that the waste incineration flue gas that exists now does not spray water the cooling and lead to is inefficiency, active carbon absorption dioxin inefficiency, avoid flue gas water spray cooling aggravation sack cleaner dewfall corruption and stick with paste the risk of bag, prevent and treat the visual pollution that the chimney emits white cigarette, realize energy saving and emission reduction.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
the embodiment of the utility model provides a high-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system, its characterized in that includes dry process deacidification tower, waste heat recovery heat exchanger, connection flue, sack cleaner, draught fan and chimney in proper order along flue gas flow direction, the other feed arrangement who is used for providing the baking soda that still is connected with of cominging in and going out of dry process deacidification tower, waste heat recovery heat exchanger's medium entry passes through the boiler feed pump and links to each other with the boiler oxygen-eliminating device, waste heat recovery heat exchanger's medium exit linkage has exhaust-heat boiler, be connected with the second feed arrangement who is used for spouting into active carbon powder on the connection flue.
Further, the flue gas is discharged from an outlet of a waste heat boiler economizer or a quenching tower.
Further, the temperature of the flue gas is 200-230 ℃.
Further, the particle size of the baking soda is as follows: 700 to 825 mesh.
Further, after the flue gas is subjected to heat exchange through the waste heat recovery heat exchanger, the temperature of the flue gas is reduced to 145-160 ℃.
Further, the circulating medium of the waste heat recovery heat exchanger is boiler feed water at 104 ℃.
Further, the average pore diameter of the activated carbon powder is 3.0-5.0 nm, and the iodine value is more than 700.
Furthermore, the first feeding device comprises a baking soda storage bin, a first dust removal fan, a fluidizing wind power heater and a first conveying fan, the first dust removal fan is arranged on the upper portion of the baking soda storage bin, the fluidizing wind power heater is arranged on the lower portion of the baking soda storage bin, and the first conveying fan is connected to an outlet of the baking soda storage bin.
Further, the second feeding device comprises an activated carbon storage bin, a second dust removal fan and a conveying fan, the second dust removal fan is arranged on the upper portion of the activated carbon storage bin, and the second conveying fan is connected to an outlet in the lower portion of the activated carbon storage bin.
According to above technical scheme, compare with prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a flue gas processing system, the step is succinct reasonable, is suitable for places such as solid useless, the useless incineration of danger. Efficiently deacidifying by using baking soda at the temperature of 140-250 ℃; set up waste heat exchanger before the active carbon adsorption is dealt with, both solved the high temperature and lead to the decline problem of active carbon adsorption efficiency, avoided the dust remover dewfall that water spray cooling caused in the flue gas again to corrode and stick with paste the bag, still retrieve the waste heat and improve boiler thermal efficiency. The cloth bag is arranged for dust removal after the activated carbon adsorption, so that the overall treatment efficiency of the smoke particles is improved. The system has good overall flue gas treatment effect and stable operation, and achieves the purposes of energy conservation and emission reduction.
(2) The utility model discloses a flue gas processing technology, the position that waste heat recovery heat exchanger arranged, the control of medium parameter make it can not take place the acid dew point and corrode, choose for use the equal material of exhaust-heat boiler economizer can, equipment long service life.
(3) The utility model discloses a flue gas treatment process adopts the waste heat recovery heat exchanger to reduce the flue gas temperature, has reduced the actual flue gas volume of sack cleaner for the water spray cooling, has reduced the investment construction cost of sack cleaner.
(4) The utility model discloses a flue gas treatment process does not have waste water to produce, can not cause the chimney to emit the visual pollution of white cigarette.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a synergistic system for efficiently deacidifying flue gas, removing dioxin and utilizing waste heat according to an embodiment of the present invention;
in the figure: 1. flue gas; 2. a first feeding device; 3. a dry deacidification tower; 4. a boiler deaerator; 5. a boiler feed pump; 6. a waste heat recovery heat exchanger; 7. a waste heat boiler; 8. a second feeding device; 9. connecting the flue; 10. a bag-type dust collector; 11. an induced draft fan; 12. and (4) a chimney.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the embodiment of the utility model provides a high-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system includes dry process deacidification tower 3, waste heat recovery heat exchanger 6, connection flue 9, sack cleaner 10, draught fan 11 and chimney 12 in proper order along 1 flow direction of flue gas, the other feed arrangement 2 that is used for providing the baking soda that still is connected with of cominging in and going out of dry process deacidification tower 3, waste heat recovery heat exchanger's medium entry passes through boiler feed pump 5 and links to each other with boiler oxygen-eliminating device 4, waste heat recovery heat exchanger's medium exit linkage has exhaust-heat boiler 7, be connected with the second feed arrangement 8 that is used for spouting into activated carbon powder on the connection flue 9.
The first feeding device 2 is mainly used for storing and finally feeding the baking soda and comprises a baking soda storage bin, a first dust removal fan, a fluidized wind power heater and a first conveying fan, wherein the first dust removal fan is arranged at the upper part of the baking soda storage bin and is used for absorbing dust generated during baking soda feeding; the fluidized wind power heater is arranged at the lower part of the baking soda storage bin, so that the flowability of the baking soda is increased, and the possibility of powder condensation and moisture change is reduced; the first conveying fan is connected with the outlet of the baking soda storage bin, so that the powder can be conveniently sprayed into the baking soda storage bin through the lower part of the dry-method deacidification tower 3.
The second feeding device 8 is mainly used for storing and feeding the active carbon and comprises an active carbon storage bin, a second dust removal fan and a conveying fan, wherein the second dust removal fan is arranged at the upper part of the active carbon storage bin and is used for absorbing the raised dust generated during the feeding of the active carbon; the second conveying fan is connected with the outlet at the lower part of the activated carbon storage bin, so that activated carbon can be conveniently sprayed in through the connecting flue 9.
In this embodiment, the flue gas 1 is discharged from an outlet of a waste heat boiler economizer or a quench tower. Generally, cooling flue gas generated by burning solid waste to 200-230 ℃ through a waste heat boiler; or the temperature of the flue gas generated by burning the hazardous waste is reduced to about 550-500 ℃ through a waste heat boiler, and then the flue gas enters a quench tower, and the temperature is reduced to 200-230 ℃ at a very high speed. And the flue gas 1 at the outlet of the economizer or the quench tower of the waste heat boiler enters a dry-method deacidification tower 3.
In the embodiment, the baking soda dry deacidification is that when the flue gas temperature reaches above 140 ℃, the superfine baking soda rapidly generates popcorn (by using high temperature in the flue gas) reaction in the flue gas, the superfine baking soda is changed into fluffy popcorn from powder, the surface area is greatly increased, the reaction activity is extremely high, the deacidification reaction speed is greatly accelerated, and the flue gas temperature of the optimal reaction is about 200-250 ℃; the deacidified product and the dust are captured by a dust collector, the smoke generated by the incineration of the compatible wastes can completely meet the standard emission requirement of acid pollutants through the deacidification of the baking soda, no waste water is generated, and the smoke emitted by a chimney is above the dew point, so that the visual pollution can be avoided. The grain size of the baking soda is as follows: 700 to 825 mesh. And (3) injecting the baking soda with the particle size of 700-825 meshes into the dry deacidification system 3, so that acidic pollutants in the flue gas and the baking soda react violently and are removed in a large amount.
In this embodiment, after the flue gas exchanges heat through the waste heat recovery heat exchanger 6, the temperature of the flue gas is reduced to 145-160 ℃. Flue gas from the dry deacidification tower 3 enters a waste heat recovery heat exchanger 6, the heat exchanger is connected with the waste heat boiler deoxygenated water 4 at 104 ℃, the temperature of the flue gas is reduced to 145-160 ℃, and the water after heat exchange enters the waste heat boiler.
In the embodiment, activated carbon powder with the aperture of 3-5 nm and the iodine value of more than 700 is sprayed into a connecting flue 9 of a bag-type dust collector at the rear end of a waste heat recovery heat exchanger, so that the optimal adsorption of dioxin in flue gas is realized at 145-160 ℃.
This embodiment still provides a flue gas high efficiency deacidification, takes off dioxin and waste heat utilization collaborative process, and this technology is realized in foretell system, and this technology includes:
(1) after the flue gas 1 is discharged from an outlet of a waste heat boiler economizer or a quench tower, the temperature of the flue gas is 200-230 ℃, the flue gas enters a dry deacidification tower 3, and a first feeding device 2 sprays 700-825-mesh baking soda to the dry deacidification tower 3 to perform a dry deacidification reaction;
(2) after the flue gas passes through the dry deacidification tower 3, the circulating medium entering the waste heat recovery heat exchanger 6 adopts boiler feed water at 104 ℃, after the flue gas passes through the waste heat recovery heat exchanger 6, the water in the waste heat recovery heat exchanger 6 recovers the waste heat in the flue gas, and then the flue gas flows back to a waste heat boiler matched with the incinerator;
(3) after heat exchange is carried out on the flue gas by the waste heat recovery heat exchanger 6, the temperature of the flue gas is reduced to 145-160 ℃, and when the flue gas passes through the connecting flue 9, the activated carbon powder sprayed in by the second feeding device 8 adsorbs dioxin pollutants in the flue gas;
(4) and finally, the flue gas is discharged from a chimney 12 after being subjected to cloth bag dust removal treatment. The flue gas sprayed with the activated carbon enters a bag-type dust collector 10, so that the activated carbon powder with saturated adsorption, deacidification products and dust in the flue gas are removed together.
By combining the incineration flue gas co-treatment method and the waste heat utilization system, the test is carried out on site, and the specific treatment results are as follows:
after passing through the bag-type dust collector, the discharged flue gas 12 is monitored on line to find SO2The removal rate is 90-96%, the total removal rate of HCl is 95-99%, and the dust emission is less than 10mg/Nm3Content of dioxin<0.1ng TEQ/Nm3And all indexes completely meet corresponding emission standards.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a high-efficient deacidification of flue gas, take off dioxin and waste heat utilization cooperative system, its characterized in that includes dry process deacidification tower, waste heat recovery heat exchanger, connection flue, sack cleaner, draught fan and chimney in proper order along flue gas flow direction, the other feeder who is used for providing the baking soda that still is connected with in and out of dry process deacidification tower, waste heat recovery heat exchanger's medium entry passes through the boiler feed water pump and links to each other with the boiler oxygen-eliminating device, waste heat recovery heat exchanger's medium exit linkage has exhaust-heat boiler, be connected with the second feeder who is used for spouting into active carbon powder on the connection flue.
2. The synergistic system for efficient deacidification, dioxin removal and waste heat utilization of flue gas as claimed in claim 1, wherein the flue gas is discharged from an outlet of a waste heat boiler economizer or a quenching tower.
3. The synergistic system for efficient deacidification, dioxin removal and waste heat utilization of flue gas as claimed in claim 1, wherein the temperature of the flue gas is 200-230 ℃.
4. The synergistic system for efficient deacidification of flue gas, dioxin removal and waste heat utilization as claimed in claim 1, wherein the grain size of the baking soda sprayed into the deacidification tower is as follows: 700 to 825 mesh.
5. The synergistic system for efficient deacidification, dioxin removal and waste heat utilization of flue gas as claimed in claim 1, wherein the temperature of the flue gas is reduced to 145-160 ℃ after the flue gas is subjected to heat exchange by a waste heat recovery heat exchanger.
6. The synergistic system for efficient flue gas deacidification, dioxin removal and waste heat utilization as claimed in claim 1, wherein the circulating medium of the waste heat recovery heat exchanger is boiler feed water at 104 ℃.
7. The synergistic system for efficient deacidification of flue gas, dioxin removal and waste heat utilization as claimed in claim 1, wherein the average pore diameter of the activated carbon powder is 3.0-5.0 nm, and the iodine value is more than 700.
8. The synergistic system for efficient flue gas deacidification, dioxin removal and waste heat utilization as claimed in claim 1, wherein the first feeding device comprises a baking soda bin, a first dust removal fan, a fluidizing wind power heater and a first conveying fan, the first dust removal fan is arranged at the upper part of the baking soda bin, the fluidizing wind power heater is arranged at the lower part of the baking soda bin, and the first conveying fan is connected to an outlet of the baking soda bin.
9. The synergistic system for efficiently deacidifying the flue gas, removing the dioxin and utilizing the waste heat according to claim 1, wherein the second feeding device comprises an activated carbon storage bin, a second dust removal fan and a conveying fan, the second dust removal fan is arranged at the upper part of the activated carbon storage bin, and the second conveying fan is connected to an outlet at the lower part of the activated carbon storage bin.
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| CN111957197A (en) * | 2020-08-28 | 2020-11-20 | 浙江物华天宝能源环保有限公司 | Efficient flue gas deacidification, dioxin removal and waste heat utilization cooperative system and process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957197A (en) * | 2020-08-28 | 2020-11-20 | 浙江物华天宝能源环保有限公司 | Efficient flue gas deacidification, dioxin removal and waste heat utilization cooperative system and process |
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