CN213913082U - Clean efficient waste incineration flue gas purification system - Google Patents
Clean efficient waste incineration flue gas purification system Download PDFInfo
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- CN213913082U CN213913082U CN202121528953.7U CN202121528953U CN213913082U CN 213913082 U CN213913082 U CN 213913082U CN 202121528953 U CN202121528953 U CN 202121528953U CN 213913082 U CN213913082 U CN 213913082U
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Abstract
The true bookThe novel clean and efficient waste incineration flue gas purification system comprises a waste heat boiler and a dust and dioxin removal integrated device, wherein a flue gas inlet of the integrated device is connected with a flue gas outlet of a coal economizer of the waste heat boiler, a flue gas outlet of the integrated device is sequentially connected with a deacidification tower and a bag-type dust remover, and a flue gas outlet of the bag-type dust remover is connected with a chimney through a draught fan; the integrated device smoke dust outlet is connected with the hydrothermal reaction kettle through the storage bin, and the outlet of the hydrothermal reaction kettle is sequentially connected with the first filter, the ultrafiltration device, the first nanofiltration device and the reverse osmosis device; the reverse osmosis concentrated solution outlet of the reverse osmosis device, the deacidification tower and the ash outlet of the bag-type dust remover are all connected with a salt chemical device which is used for generating salts and NaHCO3And the like. The utility model discloses guaranteed to burn up to standard emission of flue gas and do not produce waste water and waste residue, also do not have the flying dust to deal with landfill area-occupied or secondary pollution problem, improved the treatment effeciency of msw incineration flue gas.
Description
Technical Field
The utility model relates to a msw incineration flue gas handles technical field, concretely relates to clean efficient msw incineration flue gas purification system.
Background
As shown in fig. 1, in a conventional process flow for purifying waste incineration flue gas, flue gas at an outlet of an economizer of a waste heat boiler is deacidified by a lime semidry method, slaked lime dry powder injection, activated carbon injection and cloth bag dust removal;
the cloth bag dust removal is rich in various heavy metals such as Zn, Cu, Pb, Cd and the like, and also contains activated carbon adsorbing dioxin, because the HCl content of the waste incineration flue gas is high, and lime slurry and slaked lime dry powder are adopted as deacidification agents, the calcium and chlorine content of the cloth bag fly dust is very high, the components are very complex, and the difficulty of resource treatment and utilization is very high. Therefore, a clean and efficient waste incineration flue gas purification system is urgently needed.
Disclosure of Invention
To the weak point that exists among the prior art, the utility model provides a clean efficient msw incineration flue gas purification system.
The utility model discloses a clean and efficient waste incineration flue gas purification system, which comprises a waste heat boiler and a dust and dioxin removal integrated device, wherein a flue gas inlet of the dust and dioxin removal integrated device is connected with a flue gas outlet of a waste heat boiler economizer, a flue gas outlet of the dust and dioxin removal integrated device is sequentially connected with a deacidification tower and a bag-type dust remover, and a flue gas outlet of the bag-type dust remover is connected with a chimney through a draught fan;
a smoke dust outlet of the dust removal and dioxin removal integrated device is connected with a hydrothermal reaction kettle through a storage bin, and an outlet of the hydrothermal reaction kettle is sequentially connected with a first filter, an ultrafiltration device, a first nanofiltration device and a reverse osmosis device;
the reverse osmosis concentrated solution outlet of the reverse osmosis device, the deacidification tower and the ash outlet of the bag-type dust remover are all connected with a salt chemical device, and the salt chemical device is used for generating salts and NaHCO3And the like.
As a further improvement, the dust removal and dioxin removal integrated device comprises a cloth bag, a ceramic or metal fiber base filtration and catalysis integrated device.
As a further improvement of the utility model, the deacidification tower is NaHCO3Dry deacidification column, said NaHCO3The bottom ash hopper of the dry deacidification tower is connected with the salt chemical device, and NaHCO is used3The flue gas outlet of the dry deacidification tower is connected with the bag-type dust remover;
the flue gas from the economizer of the waste heat boiler passes through the integrated dedusting and dioxin removing device and then passes through the NaHCO3And (4) performing dry deacidification in a dry deacidification tower.
As a further improvement of the utility model, the hydrothermal reaction kettle comprises a reaction kettle and a first stirrer;
the reaction kettle is provided with a feed inlet, a discharge outlet, an oxygen inlet and a steam inlet, the feed inlet is arranged above the reaction kettle, the steam inlet is arranged at the bottom of the reaction kettle, and the oxygen inlet and the discharge outlet are respectively arranged at two sides of the bottom of the reaction kettle; the first stirrer is arranged in the reaction kettle and used for stirring materials in the reaction kettle.
As a further improvement of the utility model, the reaction kettle is also provided with a pressure release valve, a thermometer and a pressure gauge;
when a plurality of reaction kettles are connected, the pressure release valve of one reaction kettle is connected with the steam inlet of the other reaction kettle through a conduit, so that secondary utilization of the pressure release steam is realized.
As a further improvement, the feed inlet of the reaction kettle and the storage bin are provided with an auxiliary material feed inlet, the auxiliary material feed inlet is used for feeding the additive rich in silicon oxide and aluminum oxide into the smoke dust in the reaction kettle.
As a further improvement of the present invention, the outlet of the hydrothermal reaction kettle is connected with the first filter, the filtrate outlet of the first filter is connected with the ultrafiltration device, and the sludge outlet of the first filter produces zeolite;
a filtrate outlet of the ultrafiltration device is connected with the first nanofiltration device, and filter mud produced by a filter mud outlet of the ultrafiltration device returns to the reaction kettle;
a concentrated liquid outlet of the first nanofiltration device is connected with the auxiliary material feeding port through a nanofiltration concentrated liquid storage tank and is used for adjusting the water quantity ratio in the hydrothermal reaction kettle, and a dilute liquid outlet of the first nanofiltration device is connected with an inlet of the reverse osmosis device;
the reverse osmosis concentrated solution outlet of the reverse osmosis device is connected with the salt chemical device, the water outlet of the reverse osmosis device can be connected with the salt chemical device, and reverse osmosis produced water is recycled to the salt chemical device or is supplied to each device of a waste incineration plant as circulating cooling water.
As a further improvement of the utility model, the salt chemical device comprises a dissolving tank, a liquid storage tank, a soda ash production device, a second nanofiltration device, a second filter, a third filter, a fourth filter, an evaporation concentration device, a first cooling crystallizer and a second cooling crystallizer;
the reverse osmosis concentrated solution outlet, the deacidification tower and the ash outlet of the bag-type dust remover are all connected with a dissolving tank through pipelines; and the outlet of the dissolving tank is connected with the second nanofiltration device.
As a further improvement, the second nanofiltration device and the second filter are arranged between the dissolving tanks, the concentrated solution outlet of the second nanofiltration device is connected with the third filter through the first cooling crystallizer, the filtrate outlet of the third filter is connected with the inlet of the liquid storage tank, and the filtered mud outlet of the third filter is discharged with Na2SO4·10H2O and K2SO4A crystal;
the second nanofiltration device dilute liquid outlet with the evaporation concentration device is connected, the liquid storage pot outlet passes through the heat exchanger with the dissolving tank inlet is connected, the evaporation concentration device outlet passes through connect gradually behind the heat exchanger second cooling crystallizer, fourth filter and soda production device and be connected, soda production device is used for generating ammonium salt product and NaHCO3A product, the fourth filter filtering the discharged potassium salt product.
As a further improvement, the utility model also comprises an SCR denitration device, the SCR denitration device is arranged at the smoke outlet of the bag-type dust remover, the smoke outlet of the SCR denitration device passes through the draught fan with the chimney is connected.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a set up the dust removal and remove dioxin integrated device between deacidification tower and exhaust-heat boiler economizer exhanst gas outlet, will contain heavy metal and the smoke and dust of dioxin independent processing when can effectively catch dioxin in the flue gas, no longer get into the sack cleaner with flue gas deacidification product together, and the chlorine content of smoke and dust is showing and is less than lime thick liquid semi-dry method-flying dust of sack dust removal technology moreover to greatly reduced the dust removal and remove the harmful effects of the smoke and dust hydrothermal treatment that dioxin integrated device collected;
the utility model has the advantages that the smoke outlet of the integrated device for removing dust and dioxin is connected with the hydrothermal reaction kettle, and the smoke is treated by a hydrothermal method, so that the harmless treatment of the smoke is realized, the zeolite is produced, and the waste is changed into valuable;
the utility model discloses a set up salt chemical industry device, realized to sack cleaner and NaHCO3Deep processing of ash discharged from dry deacidification tower to convert the ash into ammonium salt, potassium salt and NaHCO3Product, Na2SO4·10H2O and K2SO4The product of crystallization, NaHCO3Recycled into NaHCO3The other products are sold in the dry deacidification tower, so that the resource recycling of the waste incineration smoke dust and the flue gas deacidification fly ash is realized;
the utility model discloses a process flow need not supporting landfill or cement kiln, also does not have the environmental risk problem of flying dust solidification result, has thoroughly solved the processing problem of msw incineration gas cleaning and smoke and dust, flying dust, has improved the protection to the environment.
Drawings
FIG. 1 is a process flow diagram of a conventional flue gas purification system for waste incineration;
FIG. 2 is a piping connection diagram of a clean and efficient flue gas purification system for waste incineration, which is disclosed by the present invention;
FIG. 3 is a structural diagram of a salt chemical treatment device of a clean and efficient waste incineration flue gas purification system disclosed by the utility model;
fig. 4 is a schematic connection diagram of two hydrothermal reaction kettles of a clean and efficient waste incineration flue gas purification system disclosed by the utility model;
fig. 5 is the utility model discloses a clean efficient waste incineration flue gas purification system's process flow diagram.
In the figure:
1. the outlet of the economizer contains dust-laden flue gas; 2. a dust and dioxin removal integrated device; 3. low dust flue gas; 4. smoke dust; 5. storing in a warehouse; 6. a water inlet pipe; 7. an auxiliary material charging port; 8. a pressure relief valve; 9. a hydrothermal kettle; 10. a thermometer; 11. a pressure gauge; 12-1, a first stirrer; 12-2, a second stirrer; 13 oxygen hose(ii) a 14. A steam pipe; 15-1, a first filter; 15-2, a second filter; 15-3, a third filter; 15-4, a fourth filter; 16. filtering the solution; 17. a zeolite; 18. an ultrafiltration device; 19. filtering mud; 20. performing ultrafiltration to obtain water; 21-1, a first nanofiltration device; 21-2, a second nanofiltration device; 22. a nanofiltration concentrated solution storage tank; 23. nanofiltration water outlet; 24. a reverse osmosis unit; 25. reverse osmosis yielding water; 26. a reverse osmosis concentrate storage tank; 27. a salt chemical plant; 28. NaHCO 23A dry deacidification tower; 29. depositing ash at the bottom of the tower; 30. a bag-type dust collector; 31. dedusting flue gas; 32. cloth bag fly ash; 33. an SCR denitration device; 34. an induced draft fan; 35. a chimney; 36. a dissolving tank; 37-1, a first cooling crystallizer; 37-2, a second cooling crystallizer; 38. a liquid storage tank; 39. an evaporation concentration device; 40. a soda production device; 41. a heat exchanger; 42. a potassium salt product; 43. NaHCO 23Producing a product; 44. an ammonium salt product; 45. na (Na)2SO4·10H2O and K2SO4And (4) crystal products.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the accompanying drawings:
the utility model discloses a clean and efficient waste incineration flue gas purification system, which comprises a waste heat boiler and a dust and dioxin removal integrated device 2, wherein a flue gas inlet of the dust and dioxin removal integrated device 2 is connected with a flue gas outlet of a waste heat boiler economizer, a flue gas outlet of the dust and dioxin removal integrated device 2 is sequentially connected with a deacidification tower, a bag-type dust remover 30 and an SCR denitration device 33, and a flue gas outlet of the SCR denitration device 33 is connected with a chimney 35 through an induced draft fan 34; a smoke dust outlet of the dust removal and dioxin removal integrated device 2 is connected with a hydrothermal reaction kettle through a storage bin 5, and an outlet of the hydrothermal reaction kettle is sequentially connected with a first filter 15-1, an ultrafiltration device 18, a first nanofiltration device 21-1 and a reverse osmosis device 24; the reverse osmosis concentrated solution outlet of the reverse osmosis device 24, the deacidification tower and the ash outlet of the bag-type dust remover 30 are connected with a salt chemical device 27, and the salt chemical device 27 is used for generating salts and NaHCO3And the like.
The utility model discloses a set up the dust removal and remove dioxin integrated device 2 between deacidification tower and exhaust-heat boiler economizer exhanst gas outlet, will contain the smoke and dust 4 and the independent processing of heavy metal and dioxin in the time of can effectively gathering dioxin in the flue gas, no longer get into sack cleaner 30 with flue gas deacidification product together, the chlorine content of smoke and dust 4 is showing and is being less than the flying dust of lime thick liquid semi-dry method-sack dust removal technology in addition to greatly reduced the department of smoke and dustDifficulty in management; the smoke dust outlet of the dust removal and dioxin removal integrated device 2 is connected with the hydrothermal reaction kettle, and the smoke dust 4 is treated by a hydrothermal method, so that the harmless treatment of the smoke dust 4 is realized, the zeolite 17 is produced, and waste is changed into valuable; by arranging the salt chemical device 27, the advanced processing of the ash discharged from the bag-type dust remover 30 and the deacidification tower is realized, so that the ash is converted into an ammonium salt product 44, a sylvite product 42 and NaHCO3The product 43 improves the recovery efficiency while protecting the environment, and is more beneficial to treatment and resource utilization; just the utility model discloses a process flow need not supporting landfill or cement kiln, also does not have the environmental risk problem of flying dust solidification result, has thoroughly solved the processing problem of msw incineration gas cleaning and smoke and dust flying dust, has improved the protection to the environment.
Specifically, the method comprises the following steps:
as shown in fig. 2, the utility model discloses a dust removal removes dioxin integrated device 2 includes one kind of sack, pottery or metal fiber base filtration catalysis integrated device, also can adopt other dust removals that can realize the equivalent function to remove dioxin integrated device 2.
Further, the deacidification tower of the utility model is NaHCO3 Dry deacidification column 28, NaHCO3The bottom ash bucket of the dry deacidification tower 28 is connected with a salt chemical device 27, NaHCO3The flue gas outlet of the dry deacidification tower 28 is connected with a bag-type dust remover 30, the dust-containing flue gas 1 at the outlet of the economizer of the waste heat boiler is converted into low-dust flue gas 3 and smoke 4 after being treated by the dust and dioxin removing integrated device 2, wherein the low-dust flue gas 3 is converted into the low-dust flue gas 3 through NaHCO3The dry deacidification tower 28 is used for dry deacidification, the smoke 4 is conveyed to a storage bin 5 through a pipeline and conveyed to a hydrothermal reaction kettle through the storage bin 5, and NaHCO is used for simultaneous treatment3The bottom settled ash 29 in the bottom ash hopper of the dry deacidification tower 28 is conveyed to the salt chemical plant 27 through a pipeline.
Further, the utility model discloses a hydrothermal reaction kettle includes reation kettle 9 and first agitator 12-1, be equipped with the feed inlet on reation kettle 9, the discharge gate, the oxygen entry, steam inlet, wherein the feed inlet sets up the top at reation kettle 9, steam inlet sets up the bottom at reation kettle 9, oxygen inlet sets up respectively in reation kettle 9 bottom both sides with the discharge gate, first agitator 12-1 sets up inside reation kettle 9, be used for stirring the inside material of reation kettle, in practical application, through oxygen hose 13 and steam pipe 14 and reation kettle 9's oxygen entry, steam inlet is connected, the setting of oxygen hose 13, make the decomposition efficiency of the inside dioxin of reation kettle 9 accelerate, guarantee that the dioxin can be fully decomposed and destroy.
As shown in fig. 4, it is further, the utility model discloses a still be equipped with relief valve 8 on reation kettle 9, thermometer 10 and manometer 11, when a plurality of reation kettle 9 connect, one of them reation kettle 9's relief valve 8 passes through the pipe and is connected with another reation kettle 9's steam inlet, after hydrothermal reaction in an reation kettle 9 ended, the system can be through relief valve 8 with pressure release steam escape, carry to another reation kettle 9 in through the pipe, realize the reutilization of pressure release steam, thermometer 10 and manometer 11's setting, the real-time supervision to the temperature in reation kettle 9 and pressure has been realized, make things convenient for operating personnel in time to master reation kettle 9 inside operating mode.
Further, the utility model discloses a still be equipped with auxiliary material charge door 7 between reation kettle 9's feed inlet and the storage 5, auxiliary material charge door 7 is arranged in adding the additive that is rich in silicon oxide and alumina to smoke and dust 4 from reation kettle 9 in to satisfy the component requirements that adopt special materials such as hydrothermal method synthetic zeolite 17.
Further, the utility model discloses a discharge gate and first filter 15-1 of reation kettle 9 are connected, the filtrating export of first filter 15-1 is connected with ultrafiltration device 18, the sludge outlet of first filter 15-1 is used for output zeolite 17, the filtrating export of ultrafiltration device 18 is connected with first nanofiltration device 21-1 for be connected the sludge outlet of ultrafiltration device 18 that ultrafiltration device 18 produced with exhaust-heat boiler, can carry ultrafiltration play water 20 to first nanofiltration device 21-1 in, retrieve reation kettle 9 again by a small amount of sludge 19 that ultrafiltration device 18 produced, carry out the reutilization.
Further, the utility model discloses a thick liquid export of first nanofiltration device 21-1 is connected with nanofiltration thick liquid storage tank 22 through the pipeline, and nanofiltration thick liquid storage tank 22 is connected with auxiliary material charge door 7 through inlet tube 6, and the thin liquid export and the reverse osmosis of first nanofiltration device 21-1 are adornedThe device 24 is connected and used for conveying nanofiltration effluent 23 generated by the first nanofiltration device 21-1 into the reverse osmosis device 24, a reverse osmosis concentrated solution outlet of the reverse osmosis device 24 is connected with the salt chemical device 27 through a reverse osmosis concentrated solution storage tank 26 to provide reverse osmosis concentrated solution for the salt chemical device 27 to be used as dissolved NaHCO3The solvent of settled ash is discharged from the ash outlets at the bottoms of the dry-method deacidification tower 28 and the bag-type dust remover 30.
Further, the reverse osmosis effluent 25 of the reverse osmosis device 24 of the present invention is recycled to the salt chemical plant 27 or supplied as the circulating cooling water to each equipment of the waste incineration plant. Particularly, when the chlorine content in the filtrate 16 generated after the hydrothermal reaction kettle reaches the first filter 15-1 meets the requirement of the hydrothermal reaction on the heavy metal solidification effect, the chlorine content can be directly recycled into the hydrothermal reaction kettle for recycling without passing through the ultrafiltration device 18, and when the chlorine content in the filtrate 16 exceeds a certain level, the filtrate is treated and recycled by the ultrafiltration device 18 and the reverse osmosis device 24.
As shown in fig. 3, the salt chemical device 27 of the present invention comprises a dissolving tank 36, a liquid storage tank 38, a soda ash production device 40, a second nanofiltration device 21-2, a second filter 15-2, a third filter 15-3, a fourth filter 15-4, an evaporation concentration device 39, a first cooling crystallizer 37-1, a second cooling crystallizer 37-2 and a heat exchanger 41, wherein the outlets of the reverse osmosis concentrated solution, the deacidification tower and the bag-type dust collector 30 are all connected with the dissolving tank 36 through pipelines, and the outlet of the dissolving tank 36 is connected with the second nanofiltration device 21-2.
Further, the utility model discloses a be equipped with second filter 15-2 between second nanofiltration device 21-2 and dissolving tank 36, the concentrated liquid export of receiving filtration of second nanofiltration device 21-2 is connected with third filter 15-3 through first cooling crystallizer 37-1, the filtrating export of third filter 15-3 is connected with liquid storage pot 38, the mud outlet of straining of third filter 15-3 discharges Na2SO4·10H2O and K2SO4The crystal product 45, the main component of the nanofiltration concentrated solution produced by the second nanofiltration device 21-2 of the utility model is the sulfate solution of Na and K.
Furthermore, the second nanofiltration device 21-2 of the utility model has a dilute liquid outlet and an evaporation concentration device39, an outlet 38 of the liquid storage tank is connected with an inlet of the dissolving tank 36 through a heat exchanger 41, an outlet of the evaporation concentration device 39 is sequentially connected with a second cooling crystallizer 37-2, a fourth filter 15-4 and a soda production device 40 after passing through the heat exchanger 41, and the soda production device is used for generating an ammonium salt product and NaHCO3A product, the fourth filter filtering the discharged potassium salt product. The utility model discloses a principal ingredients of the thin liquid export of second nanofiltration device 21-2 are sodium chloride and potassium chloride solution, through evaporation concentration device 39 evaporation concentration back, rethread heat exchanger 41 and second cooling crystallizer 37-2 cool down the crystallization, through the potassium salt product 42 of 15-4 separation discharge of fourth filter, the surplus mother liquor is the sodium chloride solution of high concentration, directly carries to soda production device 40, generates ammonium salt product 44 and NaHCO through soda production device 403 Product 43, NaHCO produced3 Product 43 can be recycled to NaHCO3And a dry deacidification tower 28 for secondary utilization.
Furthermore, the utility model discloses a still be equipped with second agitator 12-2 in the dissolving tank 36, second agitator 12-2 is used for stirring the salt solution in dissolving tank 36, dissolves and the homogenization with higher speed.
The utility model discloses a work flow:
1) the dust-containing flue gas 1 at the outlet of the economizer of the waste heat boiler is firstly subjected to primary purification by the dust removal and dioxin removal integrated device 2, solid particles carried in the flue gas are collected into a storage bin 5 in a smoke and dust 4 mode, and dioxin in the flue gas is decomposed into CO2HCl and H2O; the remaining low dust flue gas 3 is sent to NaHCO3The dry deacidification tower 28 performs a dry deacidification to remove most of the HCl and SO2When the acidic gas is equal, the flue gas after the dry deacidification continuously enters a bag-type dust remover 30, the fly ash containing sylvite and sodium salt is collected by an ash bucket through the bag-type dust remover 30, and the fly ash and NaHCO are mixed3The tower bottom settled ash 29 of the dry deacidification tower 28 is conveyed to a salt chemical device 27 together for deep processing;
2) the dedusting flue gas 31 after passing through the bag-type dust collector 30 is treated by an SCR denitration device 33 and then is conveyed to a chimney 35 through an induced draft fan 34 to be discharged;
3) in a storage bin5, adding the auxiliary materials into the smoke dust 4 in the hydrothermal reaction kettle through an auxiliary material feeding port 7 to meet the component requirements of special materials such as zeolite 17 synthesized by a hydrothermal method, then adding a proper amount of water to obtain a proper liquid-solid ratio, uniformly stirring, introducing steam under a closed condition, heating and pressurizing for several hours, fully curing heavy metals in the smoke dust 4, and fully decomposing and destroying dioxin. In order to accelerate decomposition and destruction of dioxin, O can be introduced into the hydrothermal process2. After the hydrothermal reaction is finished, filtering the liquid-solid mixture to obtain coarse-particle zeolite;
4) after the smoke 4 is subjected to hydrothermal reaction in the step 3, filtering through a filter to produce zeolite 17, wherein soluble components in filtrate 16 passing through the filter mainly comprise NaCl and KCl, passing through an ultrafiltration device 18, a first nanofiltration device 21-1 and a reverse osmosis device 24, and then supplying reverse osmosis concentrated solution rich in NaCl and KCl obtained by separation and produced water to a salt chemical device 27 through the reverse osmosis device 24 for processing;
5) the salt chemical engineering device 27 finally generates Na after dissolving the cloth bag fly ash 32 containing sodium salt and discharged by the cloth bag dust remover 30, the tower bottom settled ash 29 of the NaHCO3 dry deacidification tower 28 and the reverse osmosis concentrated solution2SO4·10H2O and K2SO4Crystal product 45, potassium salt product 42, ammonium salt product 44 and NaHCO3Producing a product;
6) NaHCO produced in step 53The product 43 can be treated by milling and recycled to NaHCO3And a dry deacidification tower 28 for secondary utilization.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (10)
1. A clean and efficient waste incineration flue gas purification system comprises a waste heat boiler and is characterized by further comprising a dust and dioxin removal integrated device, wherein a flue gas inlet of the dust and dioxin removal integrated device is connected with a flue gas outlet of an economizer of the waste heat boiler, a flue gas outlet of the dust and dioxin removal integrated device is sequentially connected with an deacidification tower and a bag-type dust remover, and a flue gas outlet of the bag-type dust remover is connected with a chimney through a draught fan;
a smoke dust outlet of the dust removal and dioxin removal integrated device is connected with a hydrothermal reaction kettle through a storage bin, and an outlet of the hydrothermal reaction kettle is sequentially connected with a first filter, an ultrafiltration device, a first nanofiltration device and a reverse osmosis device;
the reverse osmosis concentrated solution outlet of the reverse osmosis device, the deacidification tower and the ash outlet of the bag-type dust remover are all connected with a salt chemical device, and the salt chemical device is used for generating salts and NaHCO3By-products.
2. The clean and efficient flue gas purification system for waste incineration of claim 1, wherein the integrated dust and dioxin removal device comprises one of a cloth bag, a ceramic or metal fiber-based filtration and catalysis integrated device.
3. The clean and efficient flue gas purification system for waste incineration of claim 1, wherein the deacidification tower is NaHCO3Dry deacidification column, said NaHCO3The bottom ash hopper of the dry deacidification tower is connected with the salt chemical device, and NaHCO is used3The flue gas outlet of the dry deacidification tower is connected with the bag-type dust remover;
the flue gas from the economizer of the waste heat boiler passes through the integrated dedusting and dioxin removing device and then passes through the NaHCO3And (4) performing dry deacidification in a dry deacidification tower.
4. The clean and efficient flue gas purification system for waste incineration of claim 1, wherein the hydrothermal reaction kettle comprises a reaction kettle and a first stirrer;
the reaction kettle is provided with a feed inlet, a discharge outlet, an oxygen inlet and a steam inlet, the feed inlet is arranged above the reaction kettle, the steam inlet is arranged at the bottom of the reaction kettle, and the oxygen inlet and the discharge outlet are respectively arranged at two sides of the bottom of the reaction kettle; the first stirrer is arranged in the reaction kettle and used for stirring materials in the reaction kettle.
5. The clean and efficient flue gas purification system for waste incineration as claimed in claim 4, wherein a pressure release valve, a thermometer and a pressure gauge are further arranged on the reaction kettle;
when a plurality of reaction kettles are connected, the pressure release valve of one reaction kettle is connected with the steam inlet of the other reaction kettle through a conduit, so that secondary utilization of the pressure release steam is realized.
6. The clean and efficient flue gas purification system for waste incineration as claimed in claim 4, wherein an auxiliary material charging port is further arranged between the charging port of the reaction kettle and the storage bin, and the auxiliary material charging port is used for adding an additive rich in silica and alumina to the smoke dust in the reaction kettle.
7. The clean and efficient flue gas purification system for waste incineration of claim 6, wherein the outlet of the hydrothermal reaction kettle is connected with the first filter, the filtrate outlet of the first filter is connected with the ultrafiltration device, and the sludge outlet of the first filter produces zeolite;
a filtrate outlet of the ultrafiltration device is connected with the first nanofiltration device, and filter mud produced by a filter mud outlet of the ultrafiltration device returns to the reaction kettle;
a concentrated liquid outlet of the first nanofiltration device is connected with the auxiliary material feeding port through a nanofiltration concentrated liquid storage tank and is used for adjusting the water quantity ratio in the hydrothermal reaction kettle, and a dilute liquid outlet of the first nanofiltration device is connected with an inlet of the reverse osmosis device;
the reverse osmosis concentrated solution outlet of the reverse osmosis device is connected with the salt chemical device, the water outlet of the reverse osmosis device is connected with the salt chemical device, and reverse osmosis produced water is recycled to the salt chemical device or is supplied to each device of a garbage incineration plant as circulating cooling water.
8. The clean and efficient flue gas purification system for waste incineration as claimed in claim 1, wherein the salt chemical plant comprises a dissolving tank, a liquid storage tank, a soda ash production plant, a second nanofiltration plant, a second filter, a third filter, a fourth filter, an evaporation concentration plant, a first cooling crystallizer and a second cooling crystallizer;
the reverse osmosis concentrated solution outlet, the deacidification tower and the ash outlet of the bag-type dust remover are all connected with a dissolving tank through pipelines; and the outlet of the dissolving tank is connected with the second nanofiltration device.
9. The system of claim 8, wherein a second filter is disposed between the second nanofiltration device and the dissolution tank, a concentrated solution outlet of the second nanofiltration device is connected to the third filter through a first cooling crystallizer, a filtrate outlet of the third filter is connected to an inlet of the liquid storage tank, and a sludge outlet of the third filter discharges Na2SO4·10H2O and K2SO4A crystal;
the second nanofiltration device dilute liquid outlet with the evaporation concentration device is connected, the liquid storage tank outlet is connected with the dissolving tank inlet through a heat exchanger, the evaporation concentration device outlet is connected with a second cooling crystallizer, a fourth filter and a soda production device in sequence after passing through the heat exchanger, and the soda production device is used for generating ammonium salt products and NaHCO3A product, the fourth filter filtering the discharged potassium salt product.
10. The clean and efficient waste incineration flue gas purification system of claim 1, further comprising an SCR denitration device, wherein the SCR denitration device is arranged at a flue gas outlet of the bag-type dust remover, and the flue gas outlet of the SCR denitration device is connected with the chimney through the induced draft fan.
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| CN115780486A (en) * | 2022-10-28 | 2023-03-14 | 辽宁海天阁环保科技有限公司 | Pollutant nano-resistance control material and preparation method thereof |
| CN115780486B (en) * | 2022-10-28 | 2023-09-01 | 辽宁海天阁环保科技有限公司 | Pollutant nano resistance control material and preparation method thereof |
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