CN113028423A - Furnace and method for treating solid waste - Google Patents
Furnace and method for treating solid waste Download PDFInfo
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- CN113028423A CN113028423A CN201911356487.6A CN201911356487A CN113028423A CN 113028423 A CN113028423 A CN 113028423A CN 201911356487 A CN201911356487 A CN 201911356487A CN 113028423 A CN113028423 A CN 113028423A
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- 239000002910 solid waste Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 124
- 230000008018 melting Effects 0.000 claims abstract description 124
- 238000002485 combustion reaction Methods 0.000 claims abstract description 95
- 239000002893 slag Substances 0.000 claims abstract description 81
- 238000001816 cooling Methods 0.000 claims abstract description 52
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000003546 flue gas Substances 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 26
- 239000001301 oxygen Substances 0.000 claims description 26
- 229910052760 oxygen Inorganic materials 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000002826 coolant Substances 0.000 claims description 18
- 239000010802 sludge Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000009270 solid waste treatment Methods 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 239000010813 municipal solid waste Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 150000002978 peroxides Chemical class 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003570 air Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 27
- 239000010881 fly ash Substances 0.000 abstract description 24
- 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 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- -1 meanwhile Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000010868 animal carcass Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 239000007921 spray Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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- 239000010888 waste organic solvent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
The invention discloses a treatment furnace and a treatment method for solid waste. The furnace body of the treatment furnace comprises a melting chamber, a necking section and a combustion chamber; the straight cylinder section of the melting chamber is provided with more than 3 first nozzles, the included angle alpha between the axis of each first nozzle and the radial direction of the furnace body is 0-15 degrees, and the distance h1 between the intersection point of the axis of each first nozzle and the inner wall surface of the straight cylinder section of the melting chamber and the bottom surface of the straight cylinder section of the melting chamber is 0.1-2.0 m; the ratio x1 of the length of the straight section of the melting chamber to the inner diameter is 0.5-8; the treatment furnace is also provided with a granulating device, a first cooling device, a second nozzle and a second cooling device. The treatment furnace can realize smooth slag discharge and slag blockage prevention at the slag discharge port, reduce the fly ash content of flue gas discharged out of the furnace body, form solidified granular slag with better form and more uniform granularity, reduce the amount of the fly ash adhered to the water-cooled wall of a combustion chamber, reduce the generation amount of nitrogen oxides and realize that the flue gas discharged out of the furnace body does not contain dioxin.
Description
Technical Field
The invention relates to a solid waste treatment furnace and a treatment method.
Background
With the rapid development of socioeconomic in China, a large amount of harmful solid wastes such as sludge, waste residues and garbage are generated in daily life and industrial production processes, and if the harmful solid wastes are not properly treated, the harmful solid wastes can cause great harm to the ecological environment. Incineration is one of the main methods for treating solid waste at present, but secondary pollution of harmful substances such as dioxin, fly ash and nitrogen oxides generated by conventional incineration is serious, the treatment cost is high, and a clean and efficient solid waste recycling, reduction and harmless technology is urgently needed in modern society.
Based on this, patent document CN102537980B, published japanese patent No. 2012.07.04 discloses a high temperature melting treatment system and method for sludge, the treatment system includes a furnace body and other equipment behind the furnace body, the furnace body has a melting chamber and a secondary combustion chamber located above the melting chamber, the melting chamber is provided with a tangential feed inlet for feeding dry sludge powder and primary air tangentially into the melting chamber and forming a vortex; in the melting chamber, under the condition of high-temperature gasification, sludge powder is melted and liquefied to form liquid slag, meanwhile, flue gas containing combustible gas is generated, then, the liquid slag enters a slag pool through an overflow type slag discharge port, the liquid slag is quenched and recycled by water in the slag pool, unburned dry sludge powder and combustible gas enter a secondary combustion chamber, secondary air tangentially enters the secondary combustion chamber through a secondary air nozzle, the unburned dry sludge powder and combustible gas continue to combust under the action of oxygen and rise to a shrinkage area of the secondary combustion chamber; in the area of the reducing opening, urea aqueous solution or ammonia water sprayed in the radial direction carries out denitration in an SNCR furnace on the smoke, and then the smoke is discharged out of the furnace body; after sequentially passing through a heat exchanger for cooling, a denitration system for processing, a heat exchanger for cooling, a flue gas chilling tower, a bag-type dust remover and a wet desulphurization system, the flue gas is sucked into a chimney by a draught fan and is discharged.
Disclosure of Invention
The invention aims to solve the technical problem of providing a treatment furnace and a treatment method of solid waste in order to overcome the defects that the treatment furnace in a sludge high-temperature melting treatment system in the prior art has high fly ash content in flue gas discharged out of a furnace body, a slag discharge port is difficult to smoothly carry out slag tapping, and the slag discharge port is easy to block slag.
The inventor of the invention researches and discovers that the vertical distance h1 between the axis of the first nozzle and the radial direction of the furnace body is 0-15 degrees, the intersection point of the axis of the first nozzle and the inner wall surface of the straight cylinder section of the melting chamber and the bottom surface of the straight cylinder section of the melting chamber is 0.1-2.0 m, and the ratio x1 of the length of the straight cylinder section of the melting chamber to the inner diameter of the straight cylinder section of the melting chamber is 0.5-8, so that the negative pressure area in the center of the hearth can be eliminated and more liquid slag can be thrown to the inner wall surface of the hearth, thereby realizing smooth slag discharge and slag blockage prevention of a slag discharge port and simultaneously reducing the content of fly ash in the flue gas discharged out of the furnace body.
The invention solves the technical problems through the following technical scheme:
the invention provides a solid waste treatment furnace, which is provided with a furnace body enclosed by a water-cooled wall, wherein the furnace body comprises a melting chamber, a necking section, a combustion chamber and an outlet pipe, wherein the melting chamber, the necking section and the combustion chamber are arranged from bottom to top;
the straight cylinder section of the melting chamber is provided with more than 3 first nozzles, the included angle alpha between the axis of each first nozzle and the radial direction of the furnace body is 0-15 degrees, and the vertical distance h1 between the intersection point of the axis of each first nozzle and the inner wall surface of the straight cylinder section of the melting chamber and the bottom surface of the straight cylinder section of the melting chamber is 0.1-2.0 m; the ratio x1 of the length of the straight cylinder section of the melting chamber to the inner diameter of the straight cylinder section of the melting chamber is 0.5-8; a slag discharge pipe extending into the lower conical section of the melting chamber is arranged at the bottom of the lower conical section of the melting chamber;
the treatment furnace is also provided with a granulating device, the granulating device is provided with a central channel and a liquid storage cavity surrounding the central channel, the top of the central channel is communicated with the bottom of the slag discharge pipe, the bottom of the central channel is used for discharging granular slag, a through hole is formed in the inner side of the liquid storage cavity, the through hole penetrates through the liquid storage cavity and the central channel, and the through hole is used for introducing quenching medium into the central channel;
the upper conical section of the melting chamber is provided with a first cooling device, and the first cooling device is used for spraying a cooling medium into the melting chamber;
the straight cylinder section of the combustion chamber is provided with more than one layer of second nozzles, the included angle beta between the axis of each second nozzle and the radial direction of the furnace body is 0-15 degrees, and the vertical distance h2 between the intersection point of the axis of the second nozzle positioned at the lowermost layer and the inner wall surface of the straight cylinder section of the combustion chamber and the bottom surface of the straight cylinder section of the combustion chamber is 0.1-2.0 m; the ratio x2 of the length of the straight cylinder section of the combustion chamber to the inner diameter of the straight cylinder section of the combustion chamber is 2-20;
and the outlet pipe is provided with a second cooling device which is used for spraying a cooling medium into the outlet pipe.
The inventor of the invention researches and discovers that the form of the solidified granular slag formed after slag tapping of the comparison document mentioned in the background technology part is poor, and the solidified granular slag with better form and more uniform granularity can be formed after the granulating device of the invention is adopted; if the first cooling device is not adopted, the problem that the fly ash adheres to the inner wall of the combustion chamber more and more seriously is caused, and the generation amount of nitrogen oxides is larger; the included angle beta between the axis of the second nozzle and the radial direction of the furnace body is 0-15 degrees, the vertical distance h2 between the intersection point of the axis of the second nozzle positioned at the lowermost layer and the inner wall surface of the straight cylinder section of the combustion chamber and the bottom surface of the straight cylinder section of the combustion chamber is 0.1-2.0 m, and the ratio x2 of the length of the straight cylinder section of the combustion chamber to the inner diameter of the straight cylinder section of the combustion chamber is 2-20, so that the smoke discharged out of the furnace body does not contain dioxin.
In the invention, the inner space of the water-cooled wall is a hearth. The water-cooled wall can be a membrane water-cooled wall, and the membrane water-cooled wall can be a jacket water-cooled wall, or a water-cooled wall formed by an airtight tube panel formed by welding flat steel and tubes in a spliced manner.
In the present invention, the melting chamber may be of a structure conventional in the art, for example, the melting chamber has a lower conical section, a straight cylindrical section and an upper conical section from bottom to top.
In the present invention, the half-cone angle of the lower conical section of the melting chamber may be conventional, for example, from 15 ° to 60 °, preferably from 30 ° to 45 °.
In the invention, the inner diameter of the straight cylinder section of the melting chamber refers to the diameter of a hearth of the straight cylinder section of the melting chamber, wherein the hearth refers to the inner space of the water-cooled wall.
In the present invention, the ratio x1 of the length of the straight section of the melting chamber to the inner diameter of the straight section of the melting chamber is preferably 2 to 5, such as 3 or 4.
In the present invention, the half-cone angle of the upper conical section of the melting chamber may be conventional, for example, from 5 ° to 75 °, preferably from 10 ° to 45 °, for example 30 °.
In the present invention, the first nozzles may be uniformly distributed in the circumferential direction of the straight cylinder section of the melting chamber in a manner conventional in the art.
In the present invention, the first nozzle may be used to introduce solid waste particles and a gasifying agent (e.g., an oxygen-containing gas such as air and/or oxygen-enriched air) into the melting chamber as is conventional in the art. The first nozzle may be a conventional two-channel nozzle or a three-channel nozzle.
Wherein, when the heat value of the solid waste can realize the slag tapping at the bottom of the melting chamber, the first nozzle can be a two-channel nozzle, and the first nozzle is used for introducing solid waste particles and gasifying agents (such as oxygen-containing gas, such as air and/or oxygen-enriched air) into the melting chamber.
When the heat value of the solid waste can not realize slag tapping at the bottom of the melting chamber, the first nozzle can be a three-channel nozzle and is used for introducing solid waste particles, gasifying agents (such as air and/or oxygen enrichment) and fuel into the melting chamber.
In the present invention, the angle α between the axis of the first nozzle and the radial direction of the furnace body is preferably 1 ° to 15 °, more preferably 4 ° to 8 °, for example 6 °. According to the technical scheme, the fly ash content in the flue gas discharged out of the furnace body can be further reduced, and the slag can be discharged more smoothly.
In the present invention, the angle γ between the axis of the first nozzle and the cross section of the furnace body is preferably 0 ° to 15 °, more preferably 2 ° to 10 °, for example 3 °. According to the technical scheme, the fly ash content in the flue gas discharged out of the furnace body can be further reduced, and the slag can be discharged more smoothly.
In the present invention, the vertical distance h1 between the "intersection of the axis of the first nozzle and the inner wall surface of the straight cylindrical section of the melting chamber" and the bottom surface of the straight cylindrical section of the melting chamber is preferably 0.3m to 1.2m, for example, 1 m. According to the technical scheme, the fly ash content in the flue gas discharged out of the furnace body can be further reduced, and the slag can be discharged more smoothly.
In the present invention, the number of the first nozzles is preferably 4 or more, and more preferably 4 to 6. According to the technical scheme, the fly ash content in the flue gas discharged out of the furnace body can be further reduced, and the slag can be discharged more smoothly.
In the invention, the structure of the slag discharge pipe can be a round pipe, and the arrangement of the slag discharge pipe can ensure that the slag in the melting chamber is discharged in an overflow mode.
In the invention, the structure of the through hole can be a circular ring.
In the present invention, the quenching medium may be water.
In the invention, the lower part of the melting chamber can be provided with a slag pool according to the conventional method in the field, and preferably, the slag pool is sleeved outside the lower conical section of the melting chamber and forms an integrated furnace body structure with the melting chamber, the necking section and the combustion chamber. And those skilled in the art will appreciate that the level of quenching medium (e.g., water) in the slag bath is below the granulating device.
In the present invention, the first cooling device is preferably adapted to inject the cooling medium in a radial direction of the melting chamber.
In the present invention, the first cooling device may be a ring of pipes provided along a circumferential direction of an upper tapered section of the melting chamber.
In the present invention, the first cooling means is preferably provided at the top, e.g. the top surface, of the upper conical section of the melting chamber.
In the present invention, the cooling medium sprayed into the melting chamber by the first cooling device may be a liquid medium and/or a gaseous medium, and the cooling medium may be one or more of water, an aqueous solution containing a solute, steam, flue gas and nitrogen, preferably liquid water or an aqueous solution containing ammonia. The first cooling device can reduce the temperature of the fly ash particles in the combustible gas, reduce the adhesion of the fly ash, reduce the amount of the fly ash adhered to the water-cooled wall of the combustion chamber and simultaneously reduce the generation of nitrogen oxides.
In the present invention, the structure of the necking section may be a conventional cylindrical shape.
In the present invention, the length of the constriction section may be 0.5-3m, preferably 1-2m, for example 1.5 m.
In the present invention, the combustion chamber may be of a structure conventional in the art, for example, the combustion chamber has a lower conical section, a straight cylindrical section and an upper conical section from bottom to top.
In the present invention, the half-cone angle of the lower cone section of the combustion chamber may be conventional.
In the present invention, the half-cone angle of the upper cone section of the combustion chamber may be conventional.
In the present invention, the second nozzle may be used to inject an oxygen containing gas (e.g., air and/or oxygen enriched) into the combustion chamber as is conventional in the art.
In the present invention, the second nozzles may be uniformly distributed in the circumferential direction of the straight cylinder section of the combustion chamber in a conventional arrangement in the art.
In the present invention, the angle β of the second nozzle with respect to the radial direction of the furnace body is preferably 1 ° to 15 °, more preferably 4 ° to 8 °.
In the present invention, the angle δ between the axis of the second nozzle and the cross section of the furnace body is preferably 0 ° to 15 °, more preferably 2 ° to 10 °.
In the present invention, the vertical distance h2 between the "intersection of the axis of the second nozzle located at the lowermost layer and the inner wall surface of the straight tube section of the combustion chamber" and the bottom surface of the straight tube section of the combustion chamber is preferably 0.3m to 1.2m, for example, 0.5 m.
In the present invention, the straight section of the combustion chamber may be provided with a layer of second nozzles, and in this case, the number of the second nozzles may be 2 to 10, preferably 2 to 6, for example 4.
In the present invention, the straight cylinder section of the combustion chamber is preferably provided with two to four layers of second nozzles, more preferably two layers of second nozzles.
Wherein, in each layer, the number of the second nozzles can be 2-10, preferably 2-6, such as 4.
The distance between the axes of two adjacent layers of the second nozzles is preferably 0.5 to 6 times the inner diameter of the straight cylinder section of the combustion chamber, more preferably 1 to 3 times the inner diameter of the straight cylinder section of the combustion chamber, for example 2 times the inner diameter of the straight cylinder section of the combustion chamber. Wherein, the inner diameter of the straight-tube section of the combustion chamber refers to the diameter of a hearth of the straight-tube section of the combustion chamber, and the hearth refers to the inner space of the water-cooled wall.
In a preferred embodiment of the present invention, the second nozzles are divided into an upper layer and a lower layer, and the number of the second nozzles in each layer is 2 to 10, and the distance between the axis of the second nozzle in the upper layer and the axis of the second nozzle in the lower layer is 0.5 to 6 times the inner diameter of the straight cylinder section of the combustion chamber. The technical scheme can reduce the combustion temperature, and the inventor of the invention finds in research that the technical scheme can reduce the generation of thermal nitrogen oxides by more than 20 percent relative to the comparison document mentioned in the background technology.
In a preferred embodiment of the present invention, the first nozzle is biased toward one side in a radial direction of the furnace body, and the second nozzle is biased toward the other side in the radial direction of the furnace body. The inventor of the present invention found that, in the comparison documents mentioned in the background art, air is introduced into the secondary combustion chamber tangentially, which causes strong swirling flow at the inner wall, and the disturbance to the center is insufficient, so that complete combustion effect cannot be achieved in the secondary combustion chamber.
In the present invention, the second cooling device is preferably adapted to spray the cooling medium in a radial direction of the outlet pipe.
In the present invention, the second cooling means may be a ring of pipes arranged in a circumferential direction of the outlet pipe.
In the present invention, the second cooling means is preferably provided at the bottom of the outlet pipe, for example, the bottom surface.
In the present invention, the cooling medium sprayed into the outlet pipe by the second cooling device may be water or an aqueous solution containing ammonia, which is used for reducing the temperature of the flue gas.
In the invention, preferably, a cyclone separation device is further arranged outside the furnace body, the top of the furnace body is communicated with the cyclone separation device, the bottom of the cyclone separation device is communicated with one or more of the first nozzles, and an ejector is arranged on a pipeline communicated with the first nozzles and at the bottom of the cyclone separation device.
Wherein, the cyclone separation device can be provided with a smoke outlet at the top according to the conventional method.
The gas used by the ejector can be one or more of flue gas, nitrogen and air.
The invention also provides a method for treating the solid waste, which comprises the following steps:
(1) feeding the particles of the solid waste and a gasifying agent into the melting chamber through the first nozzle to obtain liquid slag and flue gas containing combustible gas;
(2) the liquid slag enters the granulating device through the slag discharge pipe, is cooled by quenching medium introduced through the through hole and is discharged from the bottom of the central channel; and the flue gas containing the combustible gas enters the necking section after being cooled by the first cooling device, then is combusted in the combustion chamber, and is discharged out of the outlet pipe after being cooled by the second cooling device.
In step (1), the solid waste is conventionally understood in the art to mean solid waste material and/or semi-solid waste material generated by human beings in production, consumption, living and other activities, and mainly includes one or more of solid particles, garbage, slag, sludge, waste products, broken vessels, defective goods, animal carcasses, spoiled food and human and animal excreta. The solid waste can also be one or more of high-concentration liquid such as waste acid, waste alkali, waste oil, waste organic solvent and the like.
In step (1), the solid waste may be one or more of sludge, garbage, waste residue and waste material, preferably dried sludge, and the water content of the dried sludge is 15 wt% to 25 wt%, for example 20 wt%.
In step (1), the calorific value of the solid waste may be, for example, 10 to 15MJ/kg, for example 13 MJ/kg.
In step (1), the D50 of the particles of the solid waste is preferably 5-2000 μm, for example 150 μm.
In step (1), the gasifying agent may be of a type conventional in the art, such as air and/or oxygen-enriched, preferably air.
In step (1), the temperature of the gasifying agent can be 20-600 ℃, preferably 250-450 ℃, for example 400 ℃.
In step (1), the melting chamber preferably has an oxygen peroxide coefficient of 0.60 to 0.95, for example 0.8 or 0.9, the oxygen peroxide coefficient of the melting chamber being the ratio of oxygen introduced into the melting chamber to the oxygen required for complete combustion of the material in the melting chamber.
In the step (1), the melting chamber can be operated under negative pressure or normal pressure, and the operating pressure of the melting chamber is preferably-50 kPa-0.1 MPa.
In step (1), the gas velocity of the straight barrel section of the melting chamber is preferably 0.5 to 5m/s, for example 1 m/s.
In the step (2), the flow velocity of the quenching medium in the through-hole is preferably 5 to 20m/s, for example, 10 m/s.
In the step (2), the cooling medium injected by the first cooling device preferably reduces the temperature of the passing flue gas to 600-. According to the preferable and better technical scheme, the surfaces of the fly ash particles in the flue gas can be cooled and solidified, the adhesion of the fly ash is eliminated, the amount of the fly ash adhered to the water-cooled wall of the combustion chamber is kept not to be increased, and the generation of nitrogen oxides is reduced.
In step (2), the gas velocity of the constriction section is preferably 1 to 30m/s, more preferably 5 to 15m/s, for example 10 m/s. The gas velocity in the range is selected, so that the fly ash content in the flue gas discharged out of the furnace body can be further reduced.
In step (2), the gas containing oxygen fed into the combustion chamber is preferably air.
In step (2), the temperature of the oxygen-containing gas introduced into the combustion chamber is preferably 350-450 ℃, for example 400 ℃.
In step (2), the combustion chamber preferably has an oxygen peroxide coefficient of 1.1 to 1.6, for example 1.4, the oxygen peroxide coefficient of the combustion chamber being the ratio of oxygen introduced into the combustion chamber to the oxygen required for complete combustion of the material in the combustion chamber.
In step (2), the gas velocity of the straight tube section of the combustion chamber is preferably 0.2 to 10m/s, for example, 1 m/s.
In the step (2), the temperature of the flue gas passing through the second cooling device is preferably reduced to 700-.
The above preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention without departing from the common general knowledge in the art.
The reagents and starting materials used in the present invention are commercially available.
The positive progress effects of the invention are as follows:
compared with the furnace body of patent document CN102537980B, the treatment furnace of the invention enables the particles of the solid waste and the gasifying agent fed into the melting chamber to form a collision type weak rotational flow through the arrangement mode position of the first nozzle and the selection of the ratio of the length to the inner diameter of the straight cylinder section of the melting chamber, so that the negative pressure area in the center of the hearth can be eliminated and more liquid slag can be thrown to the inner wall surface of the hearth, thereby realizing the smooth slag discharge of a slag discharge port and no slag blockage, and simultaneously reducing the content of fly ash in the flue gas discharged out of the furnace body; according to the treatment furnace, the solidified granular slag with good shape and uniform granularity can be formed through the arrangement of the granulating device; according to the treatment furnace, the amount of the fly ash adhered to the water-cooled wall of the combustion chamber can be reduced and the generation amount of nitrogen oxides can be reduced by arranging the first cooling device; according to the treatment furnace, the flue gas discharged out of the furnace body can be free of dioxin through the arrangement mode and the position of the second nozzle and the selection of the ratio of the length to the inner diameter of the straight cylinder section of the combustion chamber.
Drawings
FIG. 1 is a schematic view of the structure of a treating furnace according to examples 1 to 4;
FIG. 2a is a view from direction A to direction A of embodiment 1, and FIG. 2B is a view from direction B to direction B of embodiment 1;
FIG. 3a is a view from direction A to direction A of embodiment 2, and FIG. 3B is a view from direction B to direction B of embodiment 2;
FIG. 4a is a view from direction A to direction A of embodiment 3, and FIG. 4B is a view from direction B to direction B of embodiment 3;
FIG. 5a is a view from direction A to direction A of the embodiment 4, and FIG. 5B is a view from direction B to direction B of the embodiment 4;
description of reference numerals:
melting chamber 1
Necking section 2
First cooling device 7
Second cooling device 9
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Examples 1 to 4
1. Solid waste treatment furnace
The solid waste treatment furnace shown in fig. 1 comprises a furnace body enclosed by a water wall, wherein the furnace body comprises a melting chamber 1, a necking section 2, a combustion chamber 3 and an outlet pipe which is arranged above the combustion chamber 3 and communicated with the combustion chamber 3 from bottom to top;
the straight cylinder section of the melting chamber 1 is provided with a first nozzle 4, the included angle between the axis of the first nozzle 4 and the radial direction of the furnace body is alpha, and the vertical distance between the intersection point of the axis of the first nozzle 4 and the inner wall surface of the straight cylinder section of the melting chamber 1 and the bottom surface of the straight cylinder section of the melting chamber 1 is h 1; the ratio of the length of the straight cylindrical section of the melting chamber 1 to the inner diameter of the straight cylindrical section of the melting chamber 1 is x 1; the bottom of the lower conical section of the melting chamber 1 is provided with a slag discharge pipe 5 extending into the lower conical section of the melting chamber 1;
the treatment furnace is also provided with a granulating device 6, the granulating device 6 is provided with a central channel and a liquid storage cavity surrounding the central channel, the top of the central channel is communicated with the bottom of the slag discharge pipe 5, the bottom of the central channel is used for discharging granular slag, the inner side of the liquid storage cavity is provided with a through hole, the through hole penetrates through the liquid storage cavity and the central channel, and the through hole is used for introducing quenching medium into the central channel;
the upper conical section of the melting chamber 1 is provided with a first cooling device 7, and the first cooling device 7 is used for spraying a cooling medium into the melting chamber 1;
more than one layer of second nozzles 8 are arranged on the straight cylinder section of the combustion chamber 3, the included angle between the axis of each second nozzle 8 and the radial direction of the furnace body is beta, and the vertical distance between the intersection point of the axis of the second nozzle 8 positioned at the lowermost layer and the inner wall surface of the straight cylinder section of the combustion chamber 3 and the bottom surface of the straight cylinder section of the combustion chamber 3 is h 2; the ratio of the length of the straight cylindrical section of the combustion chamber 3 to the inner diameter of the straight cylindrical section of the combustion chamber 3 is x 2;
the outlet pipe is provided with a second cooling device 9, which second cooling device 9 is used for spraying a cooling medium into the outlet pipe.
Wherein, the inner space of the water-cooled wall is a hearth. The water-cooled wall is a membrane water-cooled wall, and the membrane water-cooled wall is a jacket water-cooled wall.
Wherein the melting chamber 1 has a lower conical section, a straight cylindrical section and an upper conical section from bottom to top.
Wherein the inner diameter of the straight cylinder section of the melting chamber 1 refers to the diameter of the hearth of the straight cylinder section of the melting chamber 1, wherein the hearth refers to the inner space of the water-cooled wall.
Wherein, the first nozzles 4 are uniformly distributed on the circumference of the straight cylinder section of the melting chamber 1.
Wherein the first nozzle 4 is used for introducing solid waste particles and gasifying agent air into the melting chamber 1.
Wherein, the included angle between the axis of the first nozzle 4 and the cross section of the furnace body is gamma.
The slag discharge pipe 5 is a circular pipe, and the slag discharge pipe 5 can ensure that the slag in the melting chamber 1 is discharged in an overflow mode.
Wherein, the structure of through-hole is the ring shape.
Wherein the quenching medium is water.
Wherein, the lower part of the melting chamber 1 is provided with a slag pool 10, the slag pool 10 is sleeved outside the lower conical section of the melting chamber 1, and the slag pool, the melting chamber 1, the necking section 2 and the combustion chamber 3 form an integrated furnace body structure. And those skilled in the art will appreciate that the level of the quenching medium in the slag bath 10 is below the granulation device 6.
Wherein the first cooling device 7 is a ring of pipes arranged along the circumference of the top surface of the upper conical section of the melting chamber 1.
Wherein the cooling medium sprayed into the melting chamber 1 by the first cooling device 7 is liquid water. The first cooling device 7 can reduce the temperature of the fly ash particles in the combustible gas, reduce the adhesion of the fly ash, reduce the amount of the fly ash adhering to the water wall of the combustion chamber 3, and reduce the generation of nitrogen oxides.
Wherein, the structure of the necking section 2 is cylindrical.
Wherein, the combustion chamber 3 has a lower conical section, a straight cylinder section and an upper conical section from bottom to top.
Wherein the second nozzle 8 is used for injecting air into the combustion chamber 3.
Wherein, the second nozzles 8 are uniformly distributed in the circumferential direction of the straight cylinder section of the combustion chamber 3.
Wherein, the included angle between the axis of the second nozzle 8 and the cross section of the furnace body is delta.
Wherein, the inner diameter of the straight cylinder section of the combustion chamber 3 refers to the diameter of the hearth of the straight cylinder section of the combustion chamber 3, and the hearth refers to the inner space of the water-cooled wall.
Wherein the second cooling means 9 is a ring of pipes arranged in the circumferential direction of the bottom surface of the outlet pipe.
Wherein the cooling medium sprayed into the outlet pipe by the second cooling device 9 is water, which is used for reducing the temperature of the flue gas.
Wherein, still be equipped with cyclone 11 outside the furnace body, the top and the cyclone 11 intercommunication of furnace body, one or more intercommunication in cyclone 11's the bottom and the first nozzle 4, be equipped with ejector 12 on the pipeline of cyclone 11's bottom and the first nozzle 4 intercommunication.
Wherein the cyclone separation device 11 is provided with a flue gas outlet at the top.
The gas used by the ejector 12 is air.
Specific structural parameters are shown in the following table, wherein fig. 2 to 5 are directional views of the first nozzle 4 and the second nozzle 8 of each embodiment.
2. Method for treating solid waste
The method for treating the solid waste is carried out in the treatment furnace, and comprises the following steps:
(1) the particles of the solid waste and the gasifying agent are sent into the melting chamber 1 through the first nozzle 4 to obtain liquid slag and flue gas containing combustible gas;
(2) liquid slag enters the granulating device 6 through the slag discharge pipe 5, is cooled by quenching medium introduced through the through hole and is discharged from the bottom of the central channel; and the flue gas containing combustible gas enters the necking section 2 after being cooled by the first cooling device 7, then is combusted in the combustion chamber 3, is cooled by the second cooling device 9 and then is discharged out of the outlet pipe, namely is discharged out of the furnace body.
In the step (1), the solid waste is dried sludge, and the treatment capacity of the dried sludge is 50 t/d.
In step (1), the peroxide coefficient of the melting chamber 1 refers to the ratio of oxygen introduced into the melting chamber 1 to oxygen required for complete combustion of the materials in the melting chamber 1.
In step (2), the peroxide coefficient of the combustion chamber 3 refers to the ratio of oxygen introduced into the combustion chamber 3 to oxygen required for complete combustion of the material in the combustion chamber 3.
In the step (2), the flue gas passing through the second cooling device 9 is cooled and then discharged out of the furnace body.
Wherein, the specific process parameters are shown in the following table.
The technical effects of examples 1 to 4 are shown in the following table:
comparative example 1
The angle alpha between the axis of the first nozzle and the radial direction of the furnace body is 90 degrees, the first cooling device is not arranged, the angle beta between the axis of the first nozzle and the radial direction of the furnace body is 90 degrees, the second cooling device is not arranged, and the rest is the same as the embodiment 1.
Comparative example 2
The included angle alpha between the axis of the first nozzle and the radial direction of the furnace body is 20 degrees, and the vertical distance h1 between the intersection point' of the axis of the first nozzle and the inner wall surface of the straight cylinder section of the melting chamber and the bottom surface of the straight cylinder section of the melting chamber is 2.5 m; the ratio x1 between the length of the cylindrical section of the melting chamber and the inner diameter of the cylindrical section of the melting chamber was 10, as in example 1.
The technical effects of comparative examples 1-2 are shown in the following table:
| technical effects | Comparative example 1 | Comparative example 2 |
| Slag discharge condition of slag discharge pipe | Slag blockage | Slag blockage |
Comparing example 1 with comparative example 1, it can be seen that when the included angle α between the axis of the first nozzle and the radial direction of the furnace body is 90 °, smooth slag discharge of the slag discharge pipe cannot be realized; comparing example 1 with comparative example 2, it was found that smooth slag discharge from the slag discharge pipe could not be achieved when the angle α between the axis of the first nozzle and the radial direction of the furnace body, the distance h1 between the axis of the first nozzle and the lower edge of the straight cylindrical section of the melting chamber, and the ratio x1 between the length of the straight cylindrical section of the melting chamber and the inner diameter of the straight cylindrical section of the melting chamber were not within the protection range defined by the present invention.
However, it is understood from the embodiments of the present invention that when the number of the first nozzles, the angle α between the axis of the first nozzle and the radial direction of the furnace body, the distance h1 between the axis of the first nozzle and the lower edge of the straight cylindrical section of the melting chamber, and the ratio x1 between the length of the straight cylindrical section of the melting chamber and the inner diameter of the straight cylindrical section of the melting chamber are within the protection range defined by the present invention, the slag can be smoothly discharged from the slag discharge pipe.
Compared with the furnace body of patent document CN102537980B, the treatment furnace of the invention can eliminate the negative pressure area in the center of the furnace chamber and throw more liquid slag to the inner wall surface of the furnace chamber through the arrangement mode position of the first nozzle and the selection of the ratio of the length to the inner diameter of the straight cylinder section of the melting chamber, thereby realizing the smooth slag discharge of the slag discharge port and no slag blockage, and simultaneously reducing the fly ash content in the flue gas discharged out of the furnace body; according to the treatment furnace, the solidified granular slag with good shape and uniform granularity can be formed through the arrangement of the granulating device; according to the treatment furnace, the amount of the fly ash adhered to the water-cooled wall of the combustion chamber can be reduced and the generation amount of nitrogen oxides can be reduced by arranging the first cooling device; according to the treatment furnace, the flue gas discharged out of the furnace body can be free of dioxin through the arrangement mode and the position of the second nozzle and the selection of the ratio of the length to the inner diameter of the straight cylinder section of the combustion chamber.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A solid waste treatment furnace is provided with a furnace body enclosed by a water-cooled wall, wherein the furnace body comprises a melting chamber, a necking section, a combustion chamber and an outlet pipe, wherein the melting chamber, the necking section and the combustion chamber are arranged from bottom to top; it is characterized in that the preparation method is characterized in that,
the straight cylinder section of the melting chamber is provided with more than 3 first nozzles, the included angle alpha between the axis of each first nozzle and the radial direction of the furnace body is 0-15 degrees, and the vertical distance h1 between the intersection point of the axis of each first nozzle and the inner wall surface of the straight cylinder section of the melting chamber and the bottom surface of the straight cylinder section of the melting chamber is 0.1-2.0 m; the ratio x1 of the length of the straight cylinder section of the melting chamber to the inner diameter of the straight cylinder section of the melting chamber is 0.5-8; a slag discharge pipe extending into the lower conical section of the melting chamber is arranged at the bottom of the lower conical section of the melting chamber;
the treatment furnace is also provided with a granulating device, the granulating device is provided with a central channel and a liquid storage cavity surrounding the central channel, the top of the central channel is communicated with the bottom of the slag discharge pipe, the bottom of the central channel is used for discharging granular slag, a through hole is formed in the inner side of the liquid storage cavity, the through hole penetrates through the liquid storage cavity and the central channel, and the through hole is used for introducing quenching medium into the central channel;
the upper conical section of the melting chamber is provided with a first cooling device, and the first cooling device is used for spraying a cooling medium into the melting chamber;
the straight cylinder section of the combustion chamber is provided with more than one layer of second nozzles, the included angle beta between the axis of each second nozzle and the radial direction of the furnace body is 0-15 degrees, and the vertical distance h2 between the intersection point of the axis of the second nozzle positioned at the lowermost layer and the inner wall surface of the straight cylinder section of the combustion chamber and the bottom surface of the straight cylinder section of the combustion chamber is 0.1-2.0 m; the ratio x2 of the length of the straight cylinder section of the combustion chamber to the inner diameter of the straight cylinder section of the combustion chamber is 2-20;
and the outlet pipe is provided with a second cooling device which is used for spraying a cooling medium into the outlet pipe.
2. The solid waste treatment furnace of claim 1, wherein the water-cooled wall is a membrane wall;
and/or the melting chamber is provided with a lower conical section, a straight cylinder section and an upper conical section from bottom to top;
and/or the lower conical section of the melting chamber has a half-cone angle of 15 ° to 60 °, preferably 30 ° to 45 °;
and/or the ratio x1 of the length of the straight cylinder section of the melting chamber to the inner diameter of the straight cylinder section of the melting chamber is 2-5;
and/or the upper conical section of the melting chamber has a half-cone angle of 5 ° to 75 °, preferably 10 ° to 45 °;
and/or the first nozzles are uniformly distributed in the circumferential direction of the straight cylinder section of the melting chamber;
and/or the included angle alpha between the axis of the first nozzle and the radial direction of the furnace body is 1-15 degrees, preferably 4-8 degrees;
and/or the included angle gamma between the axis of the first nozzle and the cross section of the furnace body is 0-15 degrees, preferably 2-10 degrees;
and/or the vertical distance h1 between the intersection point of the axis of the first nozzle and the inner wall surface of the straight cylinder section of the melting chamber and the bottom surface of the straight cylinder section of the melting chamber is 0.3m-1.2 m;
and/or the number of the first nozzles is more than 4, preferably 4-6.
3. The furnace for treating solid waste according to claim 1, wherein the first cooling means is adapted to inject the cooling medium in a radial direction of the melting chamber;
and/or the first cooling device is a ring of pipelines arranged along the circumferential direction of the upper conical section of the melting chamber;
and/or the cooling medium sprayed into the melting chamber by the first cooling device is one or more of water, an aqueous solution containing solute, steam, flue gas and nitrogen, preferably liquid water or an aqueous solution containing ammonia;
and/or the length of the constriction section is 0.5-3m, preferably 1-2 m.
4. The furnace for treating solid waste according to claim 1, wherein the angle β of the second nozzle with respect to the radial direction of the furnace body is 1 ° to 15 °, preferably 4 ° to 8 °;
and/or the axis of the second nozzle forms an included angle delta of 0-15 degrees, preferably 2-10 degrees with the cross section of the furnace body;
and/or the vertical distance h2 between the intersection point of the axis of the second nozzle at the lowest layer and the inner wall surface of the straight cylinder section of the combustion chamber and the bottom surface of the straight cylinder section of the combustion chamber is 0.3m-1.2 m;
and/or the straight cylinder section of the combustion chamber is provided with a layer of second nozzles, and the number of the second nozzles is 2-10, preferably 2-6.
5. The furnace for solid waste treatment according to claim 1, wherein the straight section of the combustion chamber is provided with two to four layers of second nozzles, preferably two layers of second nozzles;
wherein, in each layer, the number of the second nozzles is 2-10, preferably 2-6;
and the distance between the axes of two adjacent layers of the second nozzles is 0.5-6 times of the inner diameter of the straight cylinder section of the combustion chamber, and preferably 1-3 times of the inner diameter of the straight cylinder section of the combustion chamber.
6. The solid waste treatment furnace of claim 1, wherein the second cooling means is adapted to inject the cooling medium in a radial direction of the outlet pipe;
and/or the second cooling device is a ring of pipelines arranged along the circumferential direction of the outlet pipe;
and/or the cooling medium sprayed into the outlet pipe by the second cooling device is water or an aqueous solution containing ammonia.
7. The furnace for treating solid waste according to claim 1, wherein a cyclone separation device is further arranged outside the furnace body, the top of the furnace body is communicated with the cyclone separation device, the bottom of the cyclone separation device is communicated with one or more of the first nozzles, and an ejector is arranged on a pipeline communicating the bottom of the cyclone separation device with the first nozzles;
the cyclone separation device is preferably provided with a top flue gas outlet;
the gas used by the ejector is preferably one or more of flue gas, nitrogen and air.
8. A method for treating solid waste, which is carried out in a furnace for treating solid waste according to any one of claims 1 to 7, comprising the steps of:
(1) feeding the particles of the solid waste and a gasifying agent into the melting chamber through the first nozzle to obtain liquid slag and flue gas containing combustible gas;
(2) the liquid slag enters the granulating device through the slag discharge pipe, is cooled by quenching medium introduced through the through hole and is discharged from the bottom of the central channel; and the flue gas containing the combustible gas enters the necking section after being cooled by the first cooling device, then is combusted in the combustion chamber, and is discharged out of the outlet pipe after being cooled by the second cooling device.
9. The method for treating solid waste according to claim 8, wherein in step (1), the solid waste is one or more of sludge, garbage, waste residue and waste material, preferably dried sludge, and the water content of the dried sludge is 15 wt% to 25 wt%;
and/or in the step (1), the heat value of the solid waste is 10-15 MJ/kg;
and/or, in step (1), the D50 of the solid waste particles is 5-2000 μm;
and/or, in the step (1), the gasifying agent is air and/or oxygen-enriched air, preferably air;
and/or, in the step (1), the temperature of the gasifying agent is 20-600 ℃, preferably 250-450 ℃;
and/or, in step (1), the peroxide coefficient of the melting chamber is 0.60-0.95;
and/or, in step (1), the operating pressure of the melting chamber is-50 kPa-0.1 MPa;
and/or, in the step (1), the gas velocity of the straight cylinder section of the melting chamber is 0.5-5 m/s.
10. The method for treating solid waste according to claim 8, wherein in the step (2), the flow velocity of the quenching medium in the through-hole is 5 to 20 m/s;
and/or, in the step (2), the temperature of the passing flue gas is reduced to 600-;
and/or, in step (2), the gas velocity of the necking section is 1-30m/s, preferably 5-15 m/s;
and/or in the step (2), the gas containing oxygen fed into the combustion chamber is air;
and/or in the step (2), the temperature of the gas containing oxygen fed into the combustion chamber is 350-450 ℃;
and/or, in step (2), the peroxide coefficient of the combustion chamber is 1.1-1.6;
and/or, in the step (2), the gas velocity of the straight cylinder section of the combustion chamber is 0.2-10 m/s;
and/or, in the step (2), after the temperature of the flue gas passing through the second cooling device is reduced to 700-900 ℃, the flue gas is discharged out of the outlet pipe; preferably, the temperature of the flue gas passing through the second cooling device is reduced to 850-.
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| CN114394656A (en) * | 2022-01-18 | 2022-04-26 | 中国矿业大学 | Shale atmospheric pressure splits and returns flowing back flocculation treatment reactor |
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