CN107990320B - Method and system for cooperatively treating organic waste salt and high-salt organic wastewater by cement kiln - Google Patents
Method and system for cooperatively treating organic waste salt and high-salt organic wastewater by cement kiln Download PDFInfo
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- CN107990320B CN107990320B CN201711472370.5A CN201711472370A CN107990320B CN 107990320 B CN107990320 B CN 107990320B CN 201711472370 A CN201711472370 A CN 201711472370A CN 107990320 B CN107990320 B CN 107990320B
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- 239000004568 cement Substances 0.000 title claims abstract description 147
- 150000003839 salts Chemical class 0.000 title claims abstract description 86
- 239000002351 wastewater Substances 0.000 title claims abstract description 78
- 239000010815 organic waste Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000001704 evaporation Methods 0.000 claims abstract description 31
- 230000008020 evaporation Effects 0.000 claims abstract description 26
- 239000002699 waste material Substances 0.000 claims abstract description 22
- 239000000779 smoke Substances 0.000 claims abstract description 13
- 239000002918 waste heat Substances 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- 230000018044 dehydration Effects 0.000 claims abstract description 11
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 88
- 239000003546 flue gas Substances 0.000 claims description 88
- 238000001035 drying Methods 0.000 claims description 69
- 239000007789 gas Substances 0.000 claims description 53
- 238000004062 sedimentation Methods 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 34
- 238000001816 cooling Methods 0.000 claims description 31
- 238000000926 separation method Methods 0.000 claims description 31
- 239000000843 powder Substances 0.000 claims description 25
- 239000007787 solid Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 15
- 238000011084 recovery Methods 0.000 claims description 15
- 238000009826 distribution Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- 230000009471 action Effects 0.000 claims description 8
- 239000012752 auxiliary agent Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 6
- 241000251131 Sphyrna Species 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000003517 fume Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000002912 waste gas Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 4
- 238000010336 energy treatment Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 41
- 238000005265 energy consumption Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 239000012452 mother liquor Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000012024 dehydrating agents Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
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- 238000000227 grinding Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 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 description 1
- 150000001412 amines Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000001397 quillaja saponaria molina bark Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229930182490 saponin Natural products 0.000 description 1
- 150000007949 saponins Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
- C04B7/475—Cooling ; Waste heat management using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam
-
- 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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
-
- 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
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention provides a method and a system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln, which are characterized in that the waste heat of the waste smoke of the cement kiln is utilized to carry out low-temperature evaporation, dehydration and concentration on the high-salt organic wastewater to prepare concentrated solution with low water content, and then the high-temperature smoke of the cement kiln is used to carry out twice incineration on organic matters in the concentrated solution or organic matters in the organic waste salt to generate clean industrial salt, and waste gas generated in the process enters a cement kiln system to carry out high-temperature alkali treatment, so that secondary pollution of the organic waste salt and the high-salt organic wastewater is thoroughly eliminated, harmless, recycling, energy treatment and low-cost treatment of the organic waste salt and the high-salt organic wastewater are realized, and the environment-friendly and safe production is ensured.
Description
Technical Field
The invention relates to the technical field of waste treatment, in particular to a method and a system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln.
Background
The technology for cooperatively treating solid waste in cement kiln is waste treatment means for decomposing, degrading, eliminating, inerting, stabilizing and other toxic components of solid waste through high temperature burning and mineralizing cement clinker. The cement kiln has the technical advantages of wide application range, large consumption, strong adaptability to various wastes, large heat capacity, large thermal inertia and high heat transfer efficiency, and the technology for cooperatively disposing the solid wastes in the cement kiln is rapidly developed at present.
The high-salt organic wastewater and organic waste salt mainly come from wastewater or byproducts discharged in the industries of chemical industry, pharmacy, food processing, printing and dyeing, saponin, petroleum exploitation, papermaking, pesticide and the like. Due to the continuous development of economy, the total amount of high-salt organic wastewater and organic waste salt is huge and tends to increase year by year, and the main salt in the high-salt organic wastewater and the organic waste salt (such as NaCl and Na 2 SO 4 Etc.) are adsorbed with a great amount of toxic organic matters (such as benzene, amine, phenols, resins, ethers, phenols, etc.) which are difficult to degrade naturally, and are defined as dangerous wastes by environmental departments, if the soil and water system are damaged without effective treatment, the volatilization of the organic matters will lead to serious environmental disasters.
The high-salt organic wastewater is different from organic waste salt in that: the high-salt organic wastewater is an organic waste salt solution containing a large amount of water, and the organic waste salt is solid waste with lower water content. And dehydrating the high-salt organic wastewater to obtain organic waste salt. The disposal of high-salt organic wastewater increases the significant difficulty of removing a large amount of water over the disposal of organic waste salts. Therefore, at present, the water resource is gradually in shortage, and the effective treatment technology of high-salt organic wastewater and organic waste salt is actively discussed, so that the technology has become a hot spot field and technical problem of solid waste treatment research.
At present, the high-salt organic wastewater treatment method relates to a physicochemical and biological treatment method such as an incineration method, a deep oxidation method, a leaving exchange method, an electrochemical method, a membrane separation method, a biological method and the like. The methods have certain feasibility in theory, but the high-salt organic wastewater has high water content due to complex chemical components, and cannot achieve the ideal target in the practical implementation process.
Among them, the use of biochemistry to treat high-salt organic wastewater has lower disposal cost, but when the salt content in brine exceeds 1%, it is very difficult to maintain a suitable biological growth environment, which brings risks to long-term stable operation of the biological treatment system.
By adopting technologies such as electrolysis and membrane separation, the high-salt organic wastewater is not pure brine, contains complex other impurities, seriously influences the separation effect, and is easy to block or cause membrane failure due to complex pipelines. The equipment has high cost, large investment and high treatment cost.
The incineration method is adopted to make the organic matters in the high-salt organic wastewater react with oxygen in the air under the high temperature condition of 800-1000 ℃ to release energy and produce high-temperature combustion gas and solid residues with stable properties, thus being a very effective recycling treatment mode. However, the incineration method for evaporating a large amount of water requires a large amount of energy, and has high operation cost, and meanwhile, as the incineration gas contains Cl & lt- & gt and organic matters, dioxin possibly exists, the waste gas treatment system is complex, and the potential risk of secondary pollution exists.
CN201611095267.9 discloses a method for treating high-salt organic wastewater, which combines concentrated salt extraction and biochemical treatment, and removes inorganic salts and organic matters step by step, thus realizing standard discharge of wastewater. The specific technical steps are as follows: adding a dehydrating agent into the wastewater heated to 40-80 ℃ until the wastewater is saturated, cooling the saturated wastewater to-5 ℃, separating out mixed salt crystals, centrifugally separating the devitrified wastewater to obtain mixed salt crystals and high-organic concentrated mother liquor, washing the mixed salt crystals to obtain dehydrating agent hydrate crystals, evaporating and concentrating the washing mother liquor to extract salt, heating the dehydrating agent hydrate crystals to 95-150 ℃ for carrying out crystal transformation and dehydration to obtain regenerated dehydrating agent and condensed water, concentrating and extracting the high-organic concentrated mother liquor for 3-5 times to obtain salt-containing high-organic concentrated mother liquor, diluting the salt-containing high-organic concentrated mother liquor with the condensed water, and carrying out biochemical treatment to obtain wastewater reaching the standard. The patent adopts a biochemical treatment combined technology, biological residues can be in a water body for a long time, the influence on the environment can not be completely eliminated, and the technology has certain limitation.
CN201710205937.6 relates to a method for treating high-salt organic wastewater, which belongs to the field of wastewater treatment; mainly solves the problem of high-salt and high-organic matter wastewater, and adopts a mode of combining resin adsorption, multiple-effect or MVR evaporation and biochemical treatment to treat the wastewater, so that the removal rate of salt and COD reaches more than 99.5 percent; the resin adsorption can recycle the effective components in the wastewater to a great extent, can reduce the content of organic matters in salt, and can also reduce the subsequent biochemical cost; the salt content in the wastewater can be reduced by evaporating to remove salt, so that the wastewater can be biochemically treated. The patent adopts a biochemical treatment combined technology, biological residues can be in a water body for a long time, the influence on the environment can not be completely eliminated, and the technology has certain limitation.
Therefore, the treatment method for the organic waste salt and the high-salt organic wastewater, which have low treatment cost, reduced secondary pollution risk and low incineration treatment energy consumption, has important practical significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln, which aim to realize the treatment of the organic waste salt and high-salt organic wastewater with low cost, low pollution and low energy consumption by utilizing the process characteristics of the cement kiln, utilizing the flue gas waste heat in the cement production process and adopting the process method of combining low-temperature dehydration concentration and high-temperature incineration, thereby ensuring the environment-friendly and safe production.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in one aspect, the present invention provides a system for collaborative treatment of organic waste salts in a cement kiln, comprising: the device comprises a cement kiln system, a first incineration device, a second incineration device and a cooling recovery device;
the first incineration device comprises a vertical sleeve scattering grading drying furnace and a cyclone separator;
the vertical sleeve pipe scattering grading drying furnace is connected with the discharging port of the waste salt storage warehouse; the air outlet of the vertical sleeve scattering grading drying furnace is connected with the inlet of the cyclone separator;
The material outlet of the cyclone separator and the material outlet of the vertical sleeve scattering grading drying furnace are connected with the inlet of the secondary incineration device;
the material outlet of the secondary incineration device is connected with the inlet of the cooling recovery device;
the cooling recovery device comprises a single-cylinder cooler, a vertical elevator and a finished product storage warehouse which are connected in sequence;
the cement kiln system comprises a cooler high-temperature chamber and a cement kiln head cover;
the gas outlet of the cyclone separator is connected with a cooler high-temperature chamber;
the gas inlet of the secondary incineration device is connected with the smoke outlet of the kiln head cover of the cement kiln;
the gas outlet of the secondary incineration device is connected with the air inlet of the vertical sleeve scattering grading drying furnace.
Further, the vertical sleeve scattering grading drying furnace comprises an equipment body, wherein the equipment body comprises a cylinder body, a feeding hole, a discharging hole, an air inlet and an air outlet which are arranged on the cylinder body, and the cylinder body comprises an outer sleeve shell, an inner cylinder, a V-shaped shell and a sedimentation chamber; the V-shaped shell is connected to the bottom of the inner cylinder; the outer sleeve shell is sleeved outside the inner cylinder; the sedimentation chamber is arranged at the bottom of the outer sleeve shell; the feeding port is arranged above the V-shaped shell; the air inlet is arranged at the bottom of the V-shaped shell; the discharge port is arranged below the sedimentation chamber; the air outlet is arranged at the side edge of the sedimentation chamber;
The feeding port is provided with a scattering device, the scattering device comprises a bearing seat arranged on the V-shaped shell, a bearing connected with the bearing seat and a rotating shaft arranged on the bearing, and the bearing seat is connected with the power device through a belt pulley and a belt; the power device is arranged outside the cylinder body; and a hammer head is arranged on the rotating shaft.
Further, the shape of the hammerhead of the vertical sleeve scattering grading drying furnace is preferably triangular prism shape.
Further, hammers of the vertical sleeve scattering grading drying furnace are arranged on the rotating shaft in a staggered mode.
Further, an air inlet of the vertical sleeve scattering grading drying furnace is connected with a gas outlet of the second incineration device through a pipeline.
Further, an air outlet of the vertical sleeve pipe scattering grading drying furnace is connected with an inlet of the cyclone separator through a pipeline.
Further, the second incineration device is a high-temperature cyclone.
In one aspect, the invention provides a system for cooperatively treating high-salt organic wastewater in a cement kiln, comprising: the device comprises a pretreatment device, a cement kiln system, a first incineration device, a second incineration device and a cooling recovery device;
the pretreatment device comprises a waste liquid pool, a blending station, a sedimentation concentration pool, a bin evaporator and a concentration liquid pool which are connected in sequence;
The first incineration device comprises a vertical sleeve scattering grading drying furnace and a cyclone separator;
the outlet of the concentrated solution tank is connected with the feed inlet of the vertical sleeve scattering grading drying furnace; the air outlet of the vertical sleeve scattering grading drying furnace is connected with the inlet of the cyclone separator;
the material outlet of the cyclone separator and the material outlet of the vertical sleeve scattering grading drying furnace are connected with the inlet of the secondary incineration device;
the material outlet of the secondary incineration device is connected with the inlet of the cooling recovery device;
the cooling recovery device comprises a single-cylinder cooler, a vertical elevator and a finished product storage warehouse which are connected in sequence;
the cement kiln system comprises a cement kiln flue gas treatment system, a circulating water tank of a cement plant, a cement kiln waste heat power generation system, a cooler high-temperature chamber and a cement kiln head cover;
the flue gas inlet of the bin evaporator is connected with the flue gas outlet of the cement kiln waste heat power generation system;
the flue gas outlet of the bin evaporator is connected with the inlet of the cement kiln flue gas treatment system;
the gas outlet of the bin evaporator is connected with a circulating water tank of a cement plant and a cooler high-temperature chamber through a condenser;
the gas outlet of the cyclone separator is connected with a cooler high-temperature chamber;
The gas inlet of the secondary incineration device is connected with the smoke outlet of the kiln head cover of the cement kiln;
the gas outlet of the secondary incineration device is connected with the air inlet of the vertical sleeve scattering grading drying furnace.
Further, the bin evaporator comprises a bin body; the bin body comprises a bin chamber and a plurality of flue gas pipelines arranged in the bin chamber; the outlet of the flue gas pipeline is converged at the air outlet of the first flue gas distribution chamber; the inlet of the flue gas pipeline is converged at the air inlet of the flue gas distribution chamber II; the top of the bin body is provided with a feed inlet and an air outlet, and the bottom of the bin body is provided with a discharge outlet.
Still further, the storehouse body includes square cylinder and the cone of intercommunication each other, flue gas pipeline sets up in the square cylinder.
Furthermore, the flue gas pipeline is obliquely arranged in the bin chamber, and the included angle between the flue gas pipeline and the bin body is 30-60 degrees.
Further, the bin evaporators are arranged in series, namely, the discharge port and the feed port are arranged in series through a pipeline, and the air outlet and the air inlet are arranged in series through a pipeline.
Further, the vertical sleeve scattering grading drying furnace comprises an equipment body, wherein the equipment body comprises a cylinder body, a feeding hole, a discharging hole, an air inlet and an air outlet which are arranged on the cylinder body, and the cylinder body comprises an outer sleeve shell, an inner cylinder, a V-shaped shell and a sedimentation chamber; the V-shaped shell is connected to the bottom of the inner cylinder; the outer sleeve shell is sleeved outside the inner cylinder; the sedimentation chamber is arranged at the bottom of the outer sleeve shell; the feeding port is arranged above the V-shaped shell; the air inlet is arranged at the bottom of the V-shaped shell; the discharge port is arranged below the sedimentation chamber; the air outlet is arranged at the side edge of the sedimentation chamber;
The feeding port is provided with a scattering device, the scattering device comprises a bearing seat arranged on the V-shaped shell, a bearing connected with the bearing seat and a rotating shaft arranged on the bearing, and the bearing seat is connected with the power device through a belt pulley and a belt; the power device is arranged outside the cylinder body; and a hammer head is arranged on the rotating shaft.
Further, the shape of the hammerhead of the vertical sleeve scattering grading drying furnace is preferably triangular prism shape.
Further, hammers of the vertical sleeve scattering grading drying furnace are arranged on the rotating shaft in a staggered mode.
Further, an air inlet of the vertical sleeve scattering grading drying furnace is connected with a gas outlet of the second incineration device through a pipeline.
Further, an air outlet of the vertical sleeve pipe scattering grading drying furnace is connected with an inlet of the cyclone separator through a pipeline.
Further, the second incineration device is a high-temperature cyclone.
In one aspect, the invention provides a method for cooperatively treating organic waste salt in a cement kiln, which comprises the following steps:
step 1), organic waste salt is subjected to scattering, dehydration and desiccation, primary incineration and sedimentation treatment; the fume generated in the primary incineration process is subjected to sedimentation and cyclone separation to realize the separation of powder and gas; the separated gas enters a high-temperature chamber of a cement kiln cooler for preparing cement clinker in the cement kiln; the flue gas required by the primary incineration is from hot air exhausted after the secondary incineration;
Step 2) collecting the settled solids after the primary incineration in the step 1) and the separated powder, and carrying out secondary incineration, separation and cooling to obtain the industrial salt.
Further, in the step 1), the primary incineration is performed in a vertical sleeve scattering and grading drying furnace, organic waste salt is scattered and suspended by a high-speed rotating rotor after entering, dehydration, drying and incineration are performed under the action of a large amount of high-temperature flue gas, small-particle powder is wrapped by hot air, carried and separated out, and large-particle solids are screened out and then settled out through a discharge port to be discharged.
Furthermore, in the step 1), the small-particle powder is wrapped by hot air, carried and separated out and then enters a cyclone separator for sedimentation and cyclone separation, so that the separation of powder and gas is realized; the temperature of the separated gas is close to 400 ℃, and the separated gas is sent into a cement kiln cooler high-temperature chamber for treatment.
Further, in the step 2), the secondary incineration and separation are realized by adopting a high-temperature cyclone; the hot air in the high-temperature cyclone cylinder is from 1100 ℃ high-temperature flue gas sucked by a tertiary air pipe of the cement kiln and 900 ℃ hot air after heat exchange; the hot air discharged after the secondary incineration is the flue gas required by the primary incineration.
Further, in the step 2), a single-cylinder cooler is adopted for cooling, and the cooled materials are directly stored after being lifted.
In one aspect, the invention provides a method for cooperatively treating high-salt organic wastewater in a cement kiln, which comprises the following steps:
step 1), adding an auxiliary agent into the high-salt organic wastewater, adjusting the pH value, and then carrying out preliminary concentration and sedimentation;
step 2), evaporating the high-salt organic wastewater treated in the step 1) at a low temperature; the flue gas required by the low-temperature evaporation is 150-200 ℃ low-temperature flue gas generated by waste heat of a cement kiln;
step 3), the concentrated solution obtained after the evaporation and crystallization in the step 2) and the solid settled in the step 1) are subjected to primary incineration; the primary incineration process comprises scattering, dehydrating and drying, incinerating and settling of concentrated solution; the fume generated in the primary incineration process is subjected to sedimentation and cyclone separation to realize the separation of powder and gas; the separated gas enters a high-temperature chamber of a cement kiln cooler for preparing cement clinker in the cement kiln; the flue gas required by the primary incineration is from hot air exhausted after the secondary incineration;
and step 4), collecting the solid subjected to primary incineration in step 3) and the separated powder, and carrying out secondary incineration, separation and cooling to obtain the industrial salt.
Further, in the step 1), an auxiliary agent is added into the high-salt organic wastewater to adjust the pH to 7.5-8, and the auxiliary agent is an acid solution or an alkali solution. Preferably, the acid solution is hydrochloric acid solution or the like; the alkali solution is lime water, sodium bicarbonate solution, sodium carbonate solution, etc.
In step 2), condensing the water vapor generated by low-temperature evaporation and then feeding the condensed water vapor into a circulating water tank of a cement plant for use; non-condensable gas generated by low-temperature evaporation is sucked and then enters a cement kiln for incineration and then returns to a cement kiln flue gas treatment system for unified treatment; and the low-temperature flue gas returns to the cement kiln flue gas treatment system for unified treatment after heat exchange.
Further, in the step 3), the primary incineration is performed in a vertical sleeve scattering and grading drying furnace, concentrated solution is scattered and suspended by a high-speed rotating rotor after entering, dehydration, drying and incineration are performed under the action of a large amount of high-temperature smoke, small-particle powder is wrapped by hot air, carried and separated out, and large-particle solids are screened out and then settled and discharged through a discharge hole.
Further, in the step 3), the powder with small particles is wrapped by hot air, carried and separated out and then enters a cyclone separator for sedimentation and cyclone separation, so that the separation of the powder and the gas is realized; the temperature of the separated gas is about 400 ℃, and the gas is sent into a cement kiln cooler high-temperature chamber for treatment.
Further, in the step 4), the secondary incineration and separation are realized by adopting a high-temperature cyclone; the hot air in the high-temperature cyclone cylinder is from a tertiary air pipe of the cement kiln to suck 1100 ℃ high-temperature flue gas and 900 ℃ hot air after heat exchange; the hot air discharged after the secondary incineration is the flue gas required by the primary incineration.
Further, in the step 4), a single-cylinder cooler is adopted for cooling, and the cooled materials are directly stored after being lifted.
Compared with the prior art, the invention has the following advantages:
the invention provides a method and a system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln, which are characterized in that the waste heat of the waste smoke of the cement kiln is utilized to carry out low-temperature evaporation, dehydration and concentration on the high-salt organic wastewater to prepare concentrated solution with low water content, and then the high-temperature smoke of the cement kiln is used to carry out twice incineration on organic matters in the concentrated solution or organic matters in the organic waste salt to generate clean industrial salt, and waste gas generated in the process enters a cement kiln system to carry out high-temperature alkali treatment, so that secondary pollution of the organic waste salt and the high-salt organic wastewater is thoroughly eliminated, harmless, recycling, energy treatment and low-cost treatment of the organic waste salt and the high-salt organic wastewater are realized, and the environment-friendly and safe production is ensured.
1) The water content in the high-salt organic wastewater is reduced by low-temperature evaporation, so that pure condensed water and concentrated solution are obtained, the waste gas heat source of the cement kiln is effectively utilized, and the energy consumption is reduced;
2) The concentrated solution with low water content is directly incinerated by one-time incineration, so that organic matters in the concentrated solution are thoroughly incinerated and a large amount of heat energy is generated, the energy consumption required by incinerating the concentrated solution is facilitated, and the energy consumption is reduced; the secondary incineration is adopted, so that the organic matters in the solid are completely combusted, and secondary pollution is reduced;
3) The burnt flue gas enters a cement kiln cooler high-temperature chamber after sedimentation and cyclone separation to be used as cooling air, so that the cooling of cement kiln high-temperature clinker is realized, and meanwhile, the water vapor in the cooling air has a strong heat absorption effect, so that the rapid cooling of the clinker can be realized, the consumption of free CaO can be realized, and the stability of the quality of the clinker is facilitated; a small amount of Cl-is absorbed in cement clinker, residual organic gas can be continuously and thoroughly burnt at high temperature in a cement kiln system, and is discharged after being treated by a cement kiln flue gas treatment system, so that secondary pollution is thoroughly eliminated, and the cement kiln energy conservation is facilitated;
4) The industrial salt generated after incineration can be sold as industrial raw material, and also can be used as raw material of grinding aid for cement production, so that the high-salt organic wastewater can be reused after being treated.
Drawings
FIG. 1 is a schematic diagram of a system for co-processing organic waste salts in a cement kiln in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic view of a vertical sleeve break-up classifying drying oven according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural view of a scattering device of a vertical type sleeve scattering classifying drying furnace according to a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of a system for collaborative treatment of high-salt organic wastewater by a cement kiln in accordance with a preferred embodiment of the present invention;
Fig. 5 is a schematic structural view of a bin evaporator according to a preferred embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Example 1
As shown in fig. 1 to 3, the present invention provides a system for collaborative treatment of organic waste salts in a cement kiln, comprising: a cement kiln system, a first incineration device, a second incineration device 4 and a cooling recovery device;
the first incineration device comprises a vertical sleeve scattering grading drying furnace 2 and a cyclone separator 3;
The feeding port of the vertical sleeve scattering grading drying furnace 2 is connected with the discharging port of the waste salt storage warehouse 1; the air outlet of the vertical sleeve scattering grading drying furnace 2 is connected with the inlet of the cyclone separator 3;
the material outlet of the cyclone separator 3 and the material outlet of the vertical sleeve scattering grading drying furnace 2 are connected with the inlet of the secondary incineration device 4;
the material outlet of the secondary incineration device 4 is connected with the inlet of the cooling recovery device;
the cooling recovery device comprises a single-cylinder cooler 5, a vertical elevator 6 and a finished product storage warehouse 7 which are connected in sequence;
the cement kiln system comprises a cooler high-temperature chamber 8 and a cement kiln head cover 9;
the gas outlet of the cyclone separator 3 is connected with a cooler high-temperature chamber 8;
the gas inlet of the secondary incineration device 4 is connected with the flue gas outlet of the kiln head cover 9 of the cement kiln;
the gas outlet of the secondary incineration device 4 is connected with the air inlet of the vertical sleeve scattering grading drying furnace 2.
Preferably, the vertical sleeve scattering classifying drying furnace 2 comprises an equipment body, wherein the equipment body comprises a cylinder body, a feed inlet 21, a discharge outlet 22, an air inlet 23 and an air outlet 24 which are arranged on the cylinder body, and the cylinder body comprises an outer sleeve shell 25, an inner cylinder 26, a V-shaped shell 27 and a sedimentation chamber 28; the V-shaped shell 27 is connected to the bottom of the inner cylinder 26; the outer sleeve shell 25 is sleeved outside the inner cylinder 26; the sedimentation chamber 28 is arranged at the bottom of the outer sleeve shell 25; the feed inlet 21 is arranged above the V-shaped shell 27; the air inlet 23 is arranged at the bottom of the V-shaped shell 27; the discharge port 22 is arranged below the sedimentation chamber 28; the air outlet 24 is arranged at the side of the sedimentation chamber 28; the vertical double-layer sleeving of the outer sleeve shell 25 and the inner sleeve 26 is adopted, hot air passes through the inner sleeve 26 and then enters the outer sleeve shell 25, so that materials are suspended in the hot air all the time, the outer sleeve shell 25 provides heat preservation for the inner sleeve 26, the loss of radiant heat of equipment is reduced, meanwhile, the absolute height of a pipeline can be reduced, and the construction cost is reduced; the outer shell 25 is tightly connected with the inner barrel 26, and the diameter and the height of the outer shell depend on the moisture, the hot air quantity and the particle characteristics of the materials; the outer casing 25 takes into account the wind speed of the wind downstream, selecting a lower downstream wind speed and a larger barrel diameter;
The feeding hole 21 is provided with a scattering device 29, the scattering device 29 comprises a bearing seat 2901 arranged on the V-shaped shell 27, a bearing 2902 connected with the bearing seat 2901, and a rotating shaft 2903 arranged on the bearing 2902, and the bearing seat 2901 is connected with a power device 2906 through a belt pulley 2904 and a belt 2905; the power device 2906 is arranged outside the cylinder body; a hammer 2907 is provided on the rotation shaft 2903.
The shape of the hammerhead 2907 of the vertical sleeve scattering classification drying furnace 2 is preferably a triangular prism shape.
The hammers 2907 of the vertical sleeve scattering grading drying furnace 2 are arranged on the rotating shaft 2903 in a staggered manner.
The air inlet 23 of the vertical sleeve scattering grading drying furnace 2 is connected with the air outlet of the secondary incineration device 4 through a pipeline. The wet organic waste salt dough or block material is rapidly broken up by the breaking device 29, facilitating subsequent drying and sorting. The hammer 2907 is made of wear-resistant material, and is preferably triangular prism-shaped. The mass of each hammer head is about 5-10 Kg, and the cross distribution is beneficial to dispersion. The power device 2906 is operated to drive the rotating shaft 2903 and the hammer head 2907 to rotate at a high speed so as to break up all materials.
The air outlet 24 of the vertical sleeve pipe scattering grading drying furnace 2 is connected with the inlet of the cyclone separator 3 through a pipeline.
The secondary incineration device 4 is a high-temperature cyclone.
The method for realizing the synergistic treatment of the organic waste salt by the cement kiln by using the system of the embodiment comprises the following steps:
step 1) organic waste salt is directly discharged into a waste salt storage warehouse through a special vehicle transportation factory, the waste salt storage warehouse is poured into a closed structure by reinforced concrete, a forced ventilation opening is formed in the top of the warehouse, forced air exhaust is performed by a suction machine, and an air-fed person cooler is used as cooling air. The side of the waste salt storage warehouse is provided with an automatic automobile in-out sealing door, so that the automobile can enter and discharge conveniently. The bottom of the warehouse is provided with a discharging mechanism. The plate type metering feeder is adopted for metering feeding, and the belt conveyor is adopted for directly conveying the organic waste salt into the vertical sleeve scattering classification drying furnace. The organic waste salt is subjected to scattering, dehydration and drying, primary incineration and sedimentation treatment in a vertical sleeve scattering and grading drying furnace: after the organic waste salt enters, the organic waste salt is scattered and suspended by a high-speed rotating rotor, and is dehydrated, dried and burned under the action of a large amount of high-temperature flue gas, a large amount of organic matters are burned out in a high-temperature state, a large amount of heat energy is generated, and the energy consumption required by the evaporation of a small amount of water in the organic waste salt can be basically met; the powder material of the small particles after incineration is wrapped by hot air and carried into a cyclone separator for sedimentation and cyclone separation, so that the separation of the powder material and the gas is realized; the separated gas is sent into a cement kiln cooler high-temperature chamber 8 at the temperature of about 400 ℃, water vapor in the gas meets high-temperature clinker (1200-1300 ℃) in a cement kiln, the water vapor is absorbed and digested by free calcium oxide in the water vapor to enter the cement clinker, unburnt organic matters are thoroughly burnt in the environment of 1450-1550 ℃ of the cement kiln again, the heat is used as sintering heat required by cement production, and after the treatment, the gas enters a cement kiln flue gas treatment system again for unified treatment. The burned large-particle solid is screened out and then settled and discharged through a discharge hole; the fume generated in the primary incineration process is subjected to sedimentation and cyclone separation to realize the separation of powder and gas; the separated gas enters a high-temperature chamber of a cement kiln cooler for preparing cement clinker in the cement kiln; the flue gas required by the primary incineration is from hot air exhausted after the secondary incineration;
Step 2) collecting the settled solids after the primary incineration in the step 1) and the separated powder, and then carrying out secondary incineration on the collected solids in a high-temperature cyclone; the hot air in the high-temperature cyclone cylinder is from 1100 ℃ high-temperature flue gas pumped by a tertiary air pipe of the cement kiln and 900 ℃ hot air after cooling heat exchange of a single-cylinder cooler; the hot air discharged after the secondary incineration is the flue gas required by the primary incineration; the separated powder is cooled by a single-cylinder cooler, and the cooled material is directly stored after being lifted to obtain industrial salt.
Example 2
As shown in fig. 2 to 5, a system for cooperatively treating high-salt organic wastewater in a cement kiln, comprising: a pretreatment device, a cement kiln system, a first incineration device, a second incineration device 4 and a cooling recovery device;
the pretreatment device comprises a waste liquid pool 16, a blending station 15, a sedimentation concentration pool 14, a bin evaporator 11 and a concentration liquid pool 13 which are connected in sequence;
the first incineration device comprises a vertical sleeve scattering grading drying furnace 2 and a cyclone separator 3;
the outlet of the concentrated solution tank 13 is connected with the feed inlet of the vertical sleeve scattering grading drying furnace 2; the air outlet of the vertical sleeve scattering grading drying furnace 2 is connected with the inlet of the cyclone separator 3;
The material outlet of the cyclone separator 3 and the material outlet of the vertical sleeve scattering grading drying furnace 2 are connected with the inlet of the secondary incineration device 4;
the material outlet of the secondary incineration device 4 is connected with the inlet of the cooling recovery device;
the cooling recovery device comprises a single-cylinder cooler 5, a vertical elevator 6 and a finished product storage warehouse 7 which are connected in sequence;
the cement kiln system comprises a cement kiln flue gas treatment system, a circulating water tank 10 of a cement plant, a cement kiln waste heat power generation system 17, a cooler high-temperature chamber 8 and a cement kiln head cover 9;
the flue gas inlet of the bin evaporator 11 is connected with the flue gas outlet of the cement kiln waste heat power generation system 17;
the flue gas outlet of the bin evaporator 11 is connected with the inlet of the cement kiln flue gas treatment system;
the gas outlet of the bin evaporator 11 is connected with a circulating water tank 10 of a cement plant and a cooler high-temperature chamber 8 through a condenser 12;
the gas outlet of the cyclone separator 3 is connected with a cooler high-temperature chamber 8;
the gas inlet of the secondary incineration device 4 is connected with the flue gas outlet of the kiln head cover 9 of the cement kiln;
the gas outlet of the secondary incineration device 4 is connected with the air inlet of the vertical sleeve scattering grading drying furnace 2.
Preferably, the bin evaporator 11 comprises a bin body; the bin body comprises a bin chamber and a plurality of flue gas pipelines 1101 arranged in the bin chamber; the outlets of the flue gas pipelines 1101 are converged at an air outlet 1110 of a flue gas distribution chamber I1109; the inlet of the flue gas pipeline 1101 is converged at an air inlet 1106 of the flue gas distribution chamber II 1105; the top of the bin body is provided with a feed inlet 1108 and an air outlet 1107, and the bottom of the bin body is provided with a discharge outlet 1104. The flue gas pipeline 1101 penetrates through the bin and carries out rapid heat exchange with high-salt organic wastewater in the bin, so that the evaporation of water in the wastewater is realized, part of industrial salt is saturated after low-temperature evaporation to precipitate crystals, and the crystals are discharged through a discharge hole 1104 at the bottom of the bin body; the vaporized moisture is discharged into the conduit through the air outlet 1107.
Preferably, the bin body comprises a square cylinder 1102 and a cone 1103 which are communicated with each other, and the flue gas pipeline 1101 is arranged in the square cylinder 1102. The lower cone 1103 facilitates the discharge of concentrated waste liquid. Preferably, an insulating layer is arranged outside the bin body, so that the subsequent low-temperature evaporation and heat preservation are facilitated. Preferably, the flue gas pipeline 1101 is obliquely arranged in the bin, and the included angle between the flue gas pipeline 1101 and the bin body is 30-60 degrees. The inclined arrangement can prevent ash from being blocked, and the flue gas pipeline is uniformly arranged in the bin, so that the uniform distribution of flue gas is facilitated, and the rigidity of the flue gas pipeline is ensured.
Preferably, a plurality of the bin evaporators 11 are arranged in series, namely, the discharge port 1104 and the feed port 1108 are arranged in series through a pipeline, and the air outlet 1110 and the air inlet 1106 are arranged in series through a pipeline. According to the water content of the waste liquid and the actual requirement, a plurality of bin evaporators can be connected in series (in fig. 4 of this embodiment, two bin evaporators are connected in series schematically), so that the concentrated solution obtained by evaporating the high-salt organic waste water meets the requirement of subsequent incineration. The high-salt organic wastewater with the water content of up to 90 percent can reduce the water content to below 40 percent after being evaporated, and the device has simple mechanism, small smoke resistance, high evaporation capacity and reliable operation.
Preferably, the vertical sleeve scattering classifying drying furnace 2 comprises an equipment body, wherein the equipment body comprises a cylinder body, a feed inlet 21, a discharge outlet 22, an air inlet 23 and an air outlet 24 which are arranged on the cylinder body, and the cylinder body comprises an outer sleeve shell 25, an inner cylinder 26, a V-shaped shell 27 and a sedimentation chamber 28; the V-shaped shell 27 is connected to the bottom of the inner cylinder 26; the outer sleeve shell 25 is sleeved outside the inner cylinder 26; the sedimentation chamber 28 is arranged at the bottom of the outer sleeve shell 25; the feed inlet 21 is arranged above the V-shaped shell 27; the air inlet 23 is arranged at the bottom of the V-shaped shell 27; the discharge port 22 is arranged below the sedimentation chamber 28; the air outlet 24 is arranged at the side of the sedimentation chamber 28; the vertical double-layer sleeving of the outer sleeve shell 25 and the inner sleeve 26 is adopted, hot air passes through the inner sleeve 26 and then enters the outer sleeve shell 25, so that materials are suspended in the hot air all the time, the outer sleeve shell 25 provides heat preservation for the inner sleeve 26, the loss of radiant heat of equipment is reduced, meanwhile, the absolute height of a pipeline can be reduced, and the construction cost is reduced; the outer shell 25 is tightly connected with the inner barrel 26, and the diameter and the height of the outer shell depend on the moisture, the hot air quantity and the particle characteristics of the materials; the outer casing 25 takes into account the wind speed of the wind downstream, selecting a lower downstream wind speed and a larger barrel diameter;
The feeding hole 21 is provided with a scattering device 29, the scattering device 29 comprises a bearing seat 2901 arranged on the V-shaped shell 27, a bearing 2902 connected with the bearing seat 2901, and a rotating shaft 2903 arranged on the bearing 2902, and the bearing seat 2901 is connected with a power device 2906 through a belt pulley 2904 and a belt 2905; the power device 2906 is arranged outside the cylinder body; a hammer 2907 is provided on the rotation shaft 2903.
The shape of the hammerhead 2907 of the vertical sleeve scattering classification drying furnace 2 is preferably a triangular prism shape.
The hammers 2907 of the vertical sleeve scattering grading drying furnace 2 are arranged on the rotating shaft 2903 in a staggered manner.
The air inlet 23 of the vertical sleeve scattering grading drying furnace 2 is connected with the air outlet of the secondary incineration device 4 through a pipeline. The wet organic waste salt dough or block material is rapidly broken up by the breaking device 29, facilitating subsequent drying and sorting. The hammer 2907 is made of wear-resistant material, and is preferably triangular prism-shaped. The mass of each hammer head is about 5-10 Kg, and the cross distribution is beneficial to dispersion. The power device 2906 is operated to drive the rotating shaft 2903 and the hammer head 2907 to rotate at a high speed so as to break up all materials.
The air outlet 24 of the vertical sleeve pipe scattering grading drying furnace 2 is connected with the inlet of the cyclone separator 3 through a pipeline.
The secondary incineration device 4 is a high-temperature cyclone.
The method for realizing the synergistic treatment of the high-salt organic wastewater by the cement kiln by using the system of the embodiment comprises the following steps:
step 1), high-salt organic wastewater is directly transported from a waste production unit into a waste liquid pool of a special high-salt organic wastewater treatment station of a cement plant by adopting a special transport vehicle (tank truck), is pumped into a blending station from the waste liquid pool by adopting a vacuum pump, is added with an auxiliary agent to adjust the pH value to 7.5-8, and is pumped into a sedimentation concentration pool by adopting the vacuum pump to carry out preliminary concentration and sedimentation; the auxiliary agent is acid solution or alkali solution. Preferably, the acid solution is hydrochloric acid solution or the like; the alkali solution is lime water, sodium bicarbonate solution, sodium carbonate solution, etc.
Step 2), pumping the high-salt organic wastewater treated in the step 1) into a bin evaporator for low-temperature evaporation; the flue gas required by the low-temperature evaporation is 150-200 ℃ low-temperature flue gas generated by waste heat of a cement kiln; condensing water vapor generated by low-temperature evaporation by a condenser and then entering a circulating water tank of a cement plant for use; the non-condensable gas generated by low-temperature evaporation is sucked by a fan and enters a cement kiln for incineration, and the generated tail gas is introduced into a cement kiln flue gas treatment system for centralized treatment; and the low-temperature flue gas is introduced into a cement kiln flue gas treatment system for centralized treatment under the action of a boiler induced draft fan after heat exchange.
Step 3), collecting the concentrated solution obtained after the evaporation and crystallization in the step 2) and the solid settled in the step 1) in a concentrated waste liquid pool for storage, then directly sending the concentrated solution into a vertical sleeve scattering classification drying furnace under the action of a screw pump, and performing scattering, dehydration and drying, primary incineration and settlement treatment: the concentrated solution of the high-salt organic wastewater is scattered and suspended by a high-speed rotating rotor after entering, and is dehydrated, dried and burnt under the action of a large amount of high-temperature smoke, a large amount of organic matters are burnt out in a high-temperature state, a large amount of heat energy is generated, and the energy consumption required by evaporation of a small amount of water in the organic waste salt can be basically met; the powder material of the small particles after incineration is wrapped by hot air and carried into a cyclone separator for sedimentation and cyclone separation, so that the separation of the powder material and the gas is realized; the separated gas is sent into a cement kiln cooler high-temperature chamber at about 400 ℃, water vapor in the gas meets high-temperature clinker (1200-1300 ℃) in a cement kiln, the water vapor is absorbed and digested by free calcium oxide in the water vapor to enter the cement clinker, unburned organic matters are thoroughly burnt in the environment of 1450-1550 ℃ of the cement kiln again, the heat is used as sintering heat required by cement production, and after the treatment, the gas enters a cement kiln flue gas treatment system again for unified treatment. The burned large-particle solid is screened out and then settled and discharged through a discharge hole; the fume generated in the primary incineration process is subjected to sedimentation and cyclone separation to realize the separation of powder and gas; the separated gas enters a cement kiln cooler high-temperature chamber under the action of a high-temperature fan and is used for preparing cement clinker in a cement kiln; the flue gas required by the primary incineration is from hot air exhausted after the secondary incineration;
Step 4) collecting the settled solids subjected to the primary incineration in the step 3) and the separated powder, and then carrying out secondary incineration on the collected solids in a high-temperature cyclone; the hot air in the high-temperature cyclone cylinder is from 1100 ℃ high-temperature flue gas sucked by a tertiary air pipe of the cement kiln and 900 ℃ hot air after heat exchange of the single-cylinder cooler; the hot air discharged after the secondary incineration is the flue gas required by the primary incineration; the separated powder is cooled by a single-cylinder cooler, and the cooled material is directly stored after being lifted to obtain industrial salt.
The invention provides a method and a system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln, which are characterized in that the waste heat of the waste smoke of the cement kiln is utilized to carry out low-temperature evaporation, dehydration and concentration on the high-salt organic wastewater to prepare concentrated solution with low water content, and then the high-temperature smoke of the cement kiln is used to carry out twice incineration on organic matters in the concentrated solution or organic matters in the organic waste salt to generate clean industrial salt, and waste gas generated in the process enters a cement kiln system to carry out high-temperature alkali treatment, so that secondary pollution of the organic waste salt and the high-salt organic wastewater is thoroughly eliminated, harmless, recycling, energy treatment and low-cost treatment of the organic waste salt and the high-salt organic wastewater are realized, and the environment-friendly and safe production is ensured.
1) The water content in the high-salt organic wastewater is reduced by low-temperature evaporation, so that pure evaporation water and concentrated solution are obtained, the waste gas heat source of the cement kiln is effectively utilized, and the energy consumption is reduced;
2) The concentrated solution with low water content is directly incinerated by one-time incineration, so that organic matters in the concentrated solution are thoroughly incinerated and a large amount of heat energy is generated, the energy consumption required by incinerating the concentrated solution is facilitated, and the energy consumption is reduced; the secondary incineration is adopted, so that the organic matters in the solid are completely combusted, and secondary pollution is reduced;
3) The burnt flue gas enters a cement kiln cooler high-temperature chamber as cooling air after sedimentation and cyclone separation, so that the cement kiln high-temperature clinker is cooled, and meanwhile, water vapor in the cooling air has a strong heat absorption effect, so that the rapid cooling of the clinker can be realized, the consumption of free CaO can be realized, and the stability of the quality of the clinker is facilitated; a small amount of Cl-is absorbed in cement clinker, residual organic gas can be continuously and thoroughly burnt at high temperature in a cement kiln system, and is discharged after being treated by a cement kiln flue gas treatment system, so that the possibility of secondary pollution is thoroughly eliminated, and the cement kiln energy conservation is facilitated;
4) The industrial salt generated after incineration can be sold as industrial raw material, and also can be used as raw material of grinding aid for cement production, so that the high-salt organic wastewater can be reused after being treated.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln, which is characterized by comprising: the device comprises a cement kiln system, a first incineration device, a second incineration device and a cooling recovery device;
the first incineration device comprises a vertical sleeve scattering grading drying furnace and a cyclone separator;
the vertical sleeve pipe scattering grading drying furnace is connected with the discharging port of the waste salt storage warehouse; the air outlet of the vertical sleeve scattering grading drying furnace is connected with the inlet of the cyclone separator;
the material outlet of the cyclone separator and the material outlet of the vertical sleeve scattering grading drying furnace are connected with the inlet of the secondary incineration device;
the material outlet of the secondary incineration device is connected with the inlet of the cooling recovery device;
the cooling recovery device comprises a single-cylinder cooler, a vertical elevator and a finished product storage warehouse which are connected in sequence;
The cement kiln system comprises a cooler high-temperature chamber and a cement kiln head cover;
the gas outlet of the cyclone separator is connected with a cooler high-temperature chamber;
the gas inlet of the secondary incineration device is connected with the smoke outlet of the kiln head cover of the cement kiln;
the gas outlet of the secondary incineration device is connected with the air inlet of the vertical sleeve scattering grading drying furnace.
2. The system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln according to claim 1, wherein the vertical sleeve pipe scattering classifying and drying furnace comprises an equipment body, wherein the equipment body comprises a barrel, a feed inlet, a discharge outlet, an air inlet and an air outlet which are arranged on the barrel, and the barrel comprises an outer sleeve shell, an inner barrel, a V-shaped shell and a settling chamber; the V-shaped shell is connected to the bottom of the inner cylinder; the outer sleeve shell is sleeved outside the inner cylinder; the sedimentation chamber is arranged at the bottom of the outer sleeve shell; the feeding port is arranged above the V-shaped shell; the air inlet is arranged at the bottom of the V-shaped shell; the discharge port is arranged below the sedimentation chamber; the air outlet is arranged at the side edge of the sedimentation chamber;
the feeding port is provided with a scattering device, the scattering device comprises a bearing seat arranged on the V-shaped shell, a bearing connected with the bearing seat and a rotating shaft arranged on the bearing, and the bearing seat is connected with the power device through a belt pulley and a belt; the power device is arranged outside the cylinder body; and a hammer head is arranged on the rotating shaft.
3. The system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln according to claim 2, wherein the hammer head of the vertical sleeve scattering classifying and drying furnace is triangular prism-shaped;
the hammerheads of the vertical sleeve scattering grading drying furnace are arranged on the rotating shaft in a staggered manner;
the air inlet of the vertical sleeve scattering grading drying furnace is connected with the air outlet of the secondary incineration device through a pipeline;
and an air outlet of the vertical sleeve pipe scattering grading drying furnace is connected with an inlet of the cyclone separator through a pipeline.
4. The system for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln according to claim 1, wherein the second incineration device is a high-temperature cyclone.
5. The system for collaborative treatment of organic waste salt, high salt organic wastewater in a cement kiln of claim 1 further comprising: a pretreatment device;
the pretreatment device comprises a waste liquid pool, a blending station, a sedimentation concentration pool, a bin evaporator and a concentration liquid pool which are connected in sequence;
the outlet of the concentrated solution tank is connected with the feed inlet of the vertical sleeve scattering grading drying furnace;
the cement kiln system also comprises a cement kiln flue gas treatment system, a circulating water tank of a cement plant and a cement kiln waste heat power generation system;
The flue gas inlet of the bin evaporator is connected with the flue gas outlet of the cement kiln waste heat power generation system;
the flue gas outlet of the bin evaporator is connected with the inlet of the cement kiln flue gas treatment system;
the gas outlet of the bin evaporator is connected with a circulating water tank of a cement plant and a cooler high-temperature chamber through a condenser.
6. The system for cooperatively treating organic waste salt and high-salt organic wastewater in a cement kiln according to claim 5, wherein the bin evaporator comprises a bin body; the bin body comprises a bin chamber and a plurality of flue gas pipelines arranged in the bin chamber; the outlet of the flue gas pipeline is converged at the air outlet of the first flue gas distribution chamber; the inlet of the flue gas pipeline is converged at the air inlet of the flue gas distribution chamber II; the top of the bin body is provided with a feed inlet and an air outlet, and the bottom of the bin body is provided with a discharge outlet; the flue gas pipeline is obliquely arranged in the bin, the included angle between the flue gas pipeline and the bin body is 30-60 degrees, and the first flue gas distribution chamber and the second flue gas distribution chamber are respectively positioned at two sides of the side wall of the corresponding bin and are respectively communicated with two ends of the flue gas pipeline in the corresponding bin, and the height of an air outlet of each first flue gas distribution chamber is larger than that of an air inlet of the corresponding second flue gas distribution chamber.
7. A method for realizing the cooperative treatment of organic waste salt and high-salt organic wastewater by using the system as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:
step 1), scattering, dehydrating and drying concentrated solution of organic waste salt or high-salt organic wastewater, and carrying out primary incineration and sedimentation treatment; the fume generated in the primary incineration process is subjected to sedimentation and cyclone separation by a cyclone separator to realize the separation of powder and gas; the gas separated by the cyclone separator enters a high-temperature chamber of a cement kiln cooler for preparing cement clinker in the cement kiln; the flue gas required by the primary incineration is from hot air exhausted after the secondary incineration;
step 2) collecting the settled solids after the primary incineration in the step 1) and the separated powder, and carrying out secondary incineration, separation and cooling to obtain the industrial salt.
8. The method for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln according to claim 7, wherein in the step 1), the primary incineration is carried out in a vertical sleeve scattering and grading drying furnace, concentrated solution of the organic waste salt or the high-salt organic wastewater is scattered and suspended by a high-speed rotating rotor after entering, dehydration, drying and incineration are carried out under the action of a large amount of high-temperature flue gas, small-particle powder is wrapped by hot air, carried and separated, and large-particle solid is screened out and then settled and discharged through a discharge hole;
In the step 1), small-particle powder is wrapped by hot air, carried and separated out, and then enters a cyclone separator for sedimentation and cyclone separation, so that separation of powder and gas is realized; the gas separated by the cyclone separator is sent to a cement kiln cooler high-temperature chamber for treatment at 400 ℃.
9. The method for cooperatively treating organic waste salt and high-salt organic wastewater in a cement kiln according to claim 7, wherein in the step 2), the secondary incineration and separation are realized by adopting a high-temperature cyclone; the hot air in the high-temperature cyclone cylinder is from 1100 ℃ high-temperature flue gas sucked by a tertiary air pipe of the cement kiln and 900 ℃ hot air after heat exchange of the single-cylinder cooler; the hot air discharged after the high-temperature cyclone tube is subjected to secondary incineration enters a vertical sleeve scattering fan drying furnace so as to provide smoke required by primary incineration;
and 2) cooling by adopting a single-cylinder cooler, and directly storing the cooled material after lifting.
10. The method for cooperatively treating organic waste salt and high-salt organic wastewater by a cement kiln according to claim 7, wherein the preparation process of the concentrated solution of the high-salt organic wastewater is as follows:
step a), adding an auxiliary agent into the high-salt organic wastewater, regulating the pH to 7.5-8, and then carrying out preliminary concentration and sedimentation, wherein the auxiliary agent is an acid solution or an alkali solution;
Step b), the liquid obtained after the low-temperature evaporation of the high-salt organic wastewater treated in the step a) and the solid obtained by sedimentation in the step a) are collected together to obtain a concentrated solution of the high-salt organic wastewater; the flue gas required by the low-temperature evaporation is 150-200 ℃ low-temperature flue gas generated by waste heat of a cement kiln;
condensing the water vapor generated by the low-temperature evaporation and then enabling the condensed water vapor to enter a circulating water tank of a cement plant for use; non-condensable gas generated by low-temperature evaporation is sucked and then enters a cement kiln for incineration and then returns to a cement kiln flue gas treatment system for unified treatment; and the low-temperature flue gas returns to the cement kiln flue gas treatment system for unified treatment after heat exchange.
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| CN108679628B (en) * | 2018-08-23 | 2023-09-15 | 长沙中硅环保科技有限公司 | System and method for disposing overhaul slag of aluminum electrolysis cell by cement kiln bypass incineration |
| CN111924922B (en) * | 2020-09-17 | 2021-04-13 | 成都建筑材料工业设计研究院有限公司 | System and method for realizing cement production, seawater desalination and power generation in coastal region in combined manner |
| CN113603376A (en) * | 2021-08-31 | 2021-11-05 | 董文渊 | Harmless treatment method for byproduct industrial salt |
| CN114162889A (en) * | 2022-02-11 | 2022-03-11 | 中国能源建设集团山西省电力勘测设计院有限公司 | Zero discharge method for wastewater treatment of household garbage incineration power plant |
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