CN218561134U - Phosphogypsum comprehensive utilization system - Google Patents
Phosphogypsum comprehensive utilization system Download PDFInfo
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- CN218561134U CN218561134U CN202223146999.XU CN202223146999U CN218561134U CN 218561134 U CN218561134 U CN 218561134U CN 202223146999 U CN202223146999 U CN 202223146999U CN 218561134 U CN218561134 U CN 218561134U
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- flue gas
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- gas
- phosphogypsum
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- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 136
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 204
- 239000003546 flue gas Substances 0.000 claims abstract description 198
- 239000007789 gas Substances 0.000 claims abstract description 191
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 101
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 101
- 239000001301 oxygen Substances 0.000 claims abstract description 101
- 238000001354 calcination Methods 0.000 claims abstract description 95
- 239000000428 dust Substances 0.000 claims abstract description 95
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 88
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 84
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 82
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 70
- 230000009467 reduction Effects 0.000 claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 claims abstract description 60
- 239000002918 waste heat Substances 0.000 claims abstract description 55
- 238000011084 recovery Methods 0.000 claims abstract description 47
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000446 fuel Substances 0.000 claims abstract description 41
- 238000002360 preparation method Methods 0.000 claims abstract description 39
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 35
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 31
- 230000018044 dehydration Effects 0.000 claims abstract description 30
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000292 calcium oxide Substances 0.000 claims abstract description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002309 gasification Methods 0.000 claims description 90
- 239000003245 coal Substances 0.000 claims description 82
- 238000006722 reduction reaction Methods 0.000 claims description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 230000001105 regulatory effect Effects 0.000 claims description 36
- 238000001816 cooling Methods 0.000 claims description 33
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 28
- 239000002994 raw material Substances 0.000 claims description 19
- 239000000047 product Substances 0.000 claims description 15
- 239000002737 fuel gas Substances 0.000 claims description 13
- 239000003345 natural gas Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000006479 redox reaction Methods 0.000 claims description 9
- 238000003786 synthesis reaction Methods 0.000 claims description 9
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 239000003250 coal slurry Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000007800 oxidant agent Substances 0.000 claims description 7
- 239000006227 byproduct Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 46
- 239000001569 carbon dioxide Substances 0.000 abstract description 23
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 23
- 239000001117 sulphuric acid Substances 0.000 abstract description 4
- 235000011149 sulphuric acid Nutrition 0.000 abstract description 4
- 239000002253 acid Substances 0.000 abstract description 2
- 230000035425 carbon utilization Effects 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000002485 combustion reaction Methods 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 239000002686 phosphate fertilizer Substances 0.000 description 3
- 241000282414 Homo sapiens Species 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 150000001723 carbon free-radicals Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The utility model discloses a system is used multipurposely to ardealite, including fuel supply device, the burning furnace reduction section is forged to the ardealite, burning furnace dehydration section, flue gas waste heat recovery device, flue gas dust collector, sulphuric acid apparatus for producing, flue gas heat sink, flue gas fan I, oxygen prepare device, carbon group nitrogen-insulated gas mixer I, calcium carbonate apparatus for producing. The utility model discloses a preparation of nitrogen-free gas and be applied to the calcination of phosphogypsum, calcine the production that the back calcium oxide was applied to the calcium carbonate, sulfur dioxide's entrapment is applied to the production of sulphuric acid in the calcination flue gas, the entrapment of carbon base nitrogen insulation gas is applied to and the production of calcium carbonate is retrieved to the entrapment of carbon base in the system acid tail gas, it is combustion-supporting to retrieve the in-process waste heat of calcining, adopt the carbon base nitrogen insulation gas to replace the air simultaneously, finally realize the utilization with the calcium carbonate product replacement phosphogypsum, sulfur dioxide and the carbon dioxide entrapment and cyclic utilization that will generate, realize the green low carbon utilization and the comprehensive utilization of phosphogypsum low carbon of the fossil energy.
Description
Technical Field
The utility model relates to a technical field, concretely relates to ardealite comprehensive utilization system are calcined to ardealite.
Background
As global warming comes into contact with various aspects such as ecological safety, water resource safety, grain safety and the like, the risk of extreme climate disasters is increased, and the living environment of human beings is seriously threatened. The emission of greenhouse gases is the most main factor causing global warming, wherein the greenhouse effect generated by carbon dioxide accounts for more than 70% of all greenhouse gases, so the emission reduction of the carbon dioxide is a problem to be solved urgently and is important for controlling the greenhouse effect and relieving the global warming.
The phosphogypsum is solid waste residue produced when phosphorite is treated by sulfuric acid in the production process of phosphate fertilizer, the main component of the phosphogypsum is calcium sulfate dihydrate, besides, the phosphogypsum also contains a plurality of impurities which are harmful to the environment, such as phosphorus, fluorine, organic matters, alkali metals and the like, and the harmful substances can pollute the environment and generate great harm to the health of human bodies due to overlong stacking time. With the rapid development of the phosphate fertilizer industry in China, china has become the largest phosphate fertilizer producing country in the world and also becomes the first phosphogypsum byproduct country, so that the treatment of phosphogypsum by adopting a low-carbon environment-friendly technology is an important task at present.
At present, most of phosphogypsum is calcined by air for supporting combustion, only 21 percent of oxygen in the air participates in combustion, 78 percent of nitrogen does not participate in combustion, a large amount of nitrogen is uselessly heated and is discharged into the atmosphere at high temperature, so that a large amount of heat loss is caused, and the fuel consumption is high; meanwhile, nitrogen also reacts with oxygen at high temperature to generate NO x ，NO x The gas is discharged into the atmosphere to easily form acid rain to cause environmental pollution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a phosphogypsum comprehensive utilization system to solve the not enough of prior art.
The utility model adopts the following technical scheme:
a comprehensive utilization system of phosphogypsum comprises a fuel supply device, a reduction section of a phosphogypsum calcining furnace, a dehydration section of the phosphogypsum calcining furnace, a flue gas waste heat recovery device, a flue gas dust removal device, a sulfuric acid production device, a flue gas cooling device, a flue gas fan I, an oxygen preparation device, a carbon-based nitrogen-insulating gas mixer I and a calcium carbonate production device;
the fuel supply device is used for supplying fuel to the reduction section of the phosphogypsum calcining furnace;
the phosphogypsum calcining furnace reduction section is used for calcining the dehydrated phosphogypsum into calcium oxide;
the phosphogypsum calcining furnace dehydration section is used for dehydrating phosphogypsum by using the smoke generated by the phosphogypsum calcining furnace reduction section;
the flue gas waste heat recovery device is used for recovering the flue gas waste heat sent out from the dehydration section of the phosphogypsum calcining furnace and generating byproduct steam;
the flue gas dust removal device is used for removing dust from the flue gas after waste heat recovery;
the sulfuric acid production device is used for capturing sulfur dioxide in the flue gas after waste heat recovery and dust removal so as to produce a sulfuric acid product;
the flue gas cooling device is used for cooling the flue gas sent out by the sulfuric acid production device;
the flue gas fan I is used for pressurizing and conveying part of the cooled flue gas to the carbon-based nitrogen-insulating gas mixer I;
the oxygen preparation device is used for preparing oxygen;
the carbon-based nitrogen-insulating gas mixer I is used for mixing part of the oxygen prepared by the oxygen preparation device with the flue gas conveyed by the flue gas fan I to prepare carbon-based nitrogen-insulating gas;
the calcium carbonate production device is used for recovering part of the cooled flue gas and calcium oxide sent out from the reduction section of the phosphogypsum calcining furnace to produce calcium carbonate;
the method comprises the following steps that a fuel outlet of a fuel supply device is connected with a reduction section of a phosphogypsum calcining furnace, a calcium oxide outlet of the reduction section of the phosphogypsum calcining furnace is connected with a calcium carbonate production device, a flue gas outlet of the reduction section of the phosphogypsum calcining furnace is connected with a dehydration section of the phosphogypsum calcining furnace, a phosphogypsum outlet of the phosphogypsum supply device is connected with the dehydration section of the phosphogypsum calcining furnace, a dehydrated phosphogypsum outlet of the dehydration section of the phosphogypsum calcining furnace is connected with the reduction section of the phosphogypsum calcining furnace, and a flue gas outlet of the dehydration section of the phosphogypsum calcining furnace is connected with a flue gas waste heat recovery device; the steam product outlet of the flue gas waste heat recovery device is connected with the steam utilization device, and the flue gas outlet of the flue gas waste heat recovery device is connected with the flue gas dust removal device; the flue gas outlet of the flue gas dust removal device is connected with a sulfuric acid production device, the sulfuric acid product outlet of the sulfuric acid production device is connected with a sulfuric acid storage device, and the flue gas outlet of the sulfuric acid production device is connected with a flue gas cooling device; the flue gas outlet of the flue gas cooling device is respectively connected with a flue gas fan I and a calcium carbonate production device, and the flue gas cooling device is also provided with a flue gas emptying pipeline; a flue gas outlet of the flue gas fan I is connected with the carbon-based nitrogen-insulating gas mixer I, and a flow regulating valve is arranged on a connecting pipeline; an oxygen outlet of the oxygen preparation device is respectively connected with the carbon-based nitrogen-insulating gas mixer I and the sulfuric acid production device, and flow regulating valves are arranged on connecting pipelines; and a carbon-based nitrogen-insulating gas outlet of the carbon-based nitrogen-insulating gas mixer I is connected with a reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline.
Further, the fuel supply device comprises a fluidized bed gasification furnace, a flue gas fan II, a carbon-based nitrogen-insulating gas mixer II and a nitrogen-free gas dust removal device;
the fluidized bed gasification furnace is used for generating partial oxidation reduction reaction to generate crude synthesis gas, namely nitrogen-free fuel gas, by taking lump coal as a raw material, taking part of steam produced by the flue gas waste heat recovery device as an oxidant and taking carbon-based nitrogen-insulating gas prepared by the carbon-based nitrogen-insulating gas mixer II as a gasification agent;
the flue gas fan II is used for pressurizing and conveying the cooled part of flue gas to the carbon-based nitrogen-insulating gas mixer II;
the carbon-based nitrogen-insulating gas mixer II is used for mixing part of the oxygen prepared by the oxygen preparation device with the flue gas conveyed by the flue gas fan II to prepare carbon-based nitrogen-insulating gas;
the nitrogen-free gas dust removal device is used for removing dust from the nitrogen-free gas sent out from the fluidized bed gasification furnace;
a lump coal outlet of the lump coal supply device is connected with the fluidized bed gasification furnace, and a steam outlet of the flue gas waste heat recovery device is also connected with the fluidized bed gasification furnace; the flue gas outlet of the flue gas cooling device is also connected with a flue gas fan II, the flue gas outlet of the flue gas fan II is connected with a carbon-based nitrogen-insulating gas mixer II, and a flow regulating valve is arranged on a connecting pipeline between the flue gas outlet of the flue gas fan II and the carbon-based nitrogen-insulating gas mixer II; the oxygen outlet of the oxygen preparation device is also connected with a carbon-based nitrogen-insulating gas mixer II, and a flow regulating valve is arranged on the connecting pipeline; a carbon-based nitrogen insulation gas outlet of the carbon-based nitrogen insulation gas mixer II is connected with the fluidized bed gasification furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on the connecting pipeline; the nitrogen-free gas outlet of the fluidized bed gasification furnace is connected with the nitrogen-free gas dust removal device, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device and the reduction section of the phosphogypsum calcining furnace.
Further, the fuel supply device comprises a pulverized coal gasification furnace and a nitrogen-free fuel gas dust removal device;
the pulverized coal gasification furnace is used for generating a crude synthesis gas, namely a nitrogen-free fuel gas, by taking pulverized coal as a raw material, taking part of steam produced by the flue gas waste heat recovery device as an oxidant and taking part of oxygen produced by the oxygen production device as a gasification agent, and performing partial oxidation-reduction reaction;
the nitrogen-free gas dust removal device is used for removing dust from the nitrogen-free gas sent out by the pulverized coal gasification furnace;
the coal powder outlet of the coal powder supply device is connected with the pulverized coal gasification furnace, the steam outlet of the flue gas waste heat recovery device is also connected with the pulverized coal gasification furnace, the oxygen outlet of the oxygen preparation device is also connected with the pulverized coal gasification furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the oxygen outlet of the oxygen preparation device and the pulverized coal gasification furnace; the nitrogen-free gas outlet of the pulverized coal gasification furnace is connected with the nitrogen-free gas dust removal device, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device and the reduction section of the phosphogypsum calcining furnace.
Further, the fuel supply device comprises a water-coal-slurry gasification furnace and a nitrogen-free gas dust removal device;
the coal water slurry gasification furnace is used for generating partial oxidation-reduction reaction to generate crude synthesis gas, namely nitrogen-free fuel gas by taking coal water slurry as a raw material and taking partial oxygen prepared by the oxygen preparation device as a gasification agent;
the nitrogen-free gas dust removal device is used for removing dust from the nitrogen-free gas sent out by the water-coal-slurry gasification furnace;
the coal water slurry outlet of the coal water slurry supply device is connected with the coal water slurry gasification furnace, the oxygen outlet of the oxygen preparation device is also connected with the coal water slurry gasification furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the oxygen outlet of the oxygen preparation device and the coal water slurry gasification furnace; the nitrogen-free gas outlet of the water-coal-slurry gasification furnace is connected with a nitrogen-free gas dust removal device, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device and the reduction section of the phosphogypsum calcining furnace.
Furthermore, the nitrogen-free fuel gas dust removal device is a cyclone dust removal device.
Furthermore, the fuel supply device is a natural gas supply device, the natural gas supply device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow regulating valve is arranged on the connecting pipeline.
Further, the flue gas waste heat recovery device is a waste heat boiler.
Further, the flue gas dust removal device is a cyclone dust removal device.
Further, the flue gas cooling device is a water cooling device.
The utility model has the advantages that:
1. the utility model discloses a flue gas that the burning furnace reduction section of burning ardealite comes out heats the dehydration for the raw materials ardealite of burning furnace dehydration section of burning ardealite, and the ardealite after will dehydrating is sent into burning furnace reduction section of burning ardealite again and is calcined into the calcium oxide, fully retrieves the heat, reduces the consumption of fuel simultaneously, is a big breakthrough on energy saving and emission reduction.
2. The utility model discloses carry out waste heat recovery before the flue gas that the burning furnace comes out is forged to ardealite and by-product steam, not only can be used for fluidized bed gasifier, fine coal gasifier production nitrogen-free gas as the oxidant, unnecessary steam still can sell outward, improves the added value.
3. The utility model discloses carry out the entrapment with the sulfur dioxide in the flue gas after waste heat recovery, dust removal and process into sulphuric acid product, carry out comprehensive utilization to sulfur dioxide, have positive effect to reducing acid rain.
4. The utility model discloses waste heat recovery, remove dust, flue gas (making sour tail gas) principal ingredients behind the sulfur dioxide entrapment is the carbon dioxide, content is more than 95v%, carry out the comprehensive utilization to carbon dioxide, firstly carbon dioxide and oxygen mix become carbon group nitrogen insulation gas as the combustion improver of the burning furnace reduction section is forged to the ardealite, and the gasifying agent when fluidized bed gasifier preparation does not have nitrogen gas, secondly carbon dioxide and calcine the calcium oxide reaction production calcium carbonate that the ardealite produced, have carbon emission reduction, control greenhouse effect, slow down the positive effect of global warming.
5. The utility model discloses a nitrogen-free gas is prepared as the fuel that the ardealite was calcined as the gasifying agent to the carbon radical nitrogen insulation gas of oxygen or oxygen + carbon dioxide, greatly reduced raw materials type nitrogen oxide's production to the carbon radical nitrogen insulation gas of oxygen + carbon dioxide has stopped heating power type nitrogen oxide's production as the combustion improver that the ardealite was calcined, reduces discharging to have great significance to the atmosphere.
6. The utility model discloses carbon dioxide reaction production calcium carbonate in calcium oxide and the flue gas that the ardealite produced after calcining, calcium carbonate purity is at 80 ~ 90wt%, can directly regard as cement clinker's raw materials, building prefabricated member's raw materials, the raw materials of artificial board, the aggregate of concrete, still can further purify and obtain micrite calcium carbonate product.
7. The utility model discloses a preparation of nitrogen-free gas and be applied to the calcination of ardealite, the production of calcium carbonate is applied to the calcium oxide after the calcination, calcine the production of sulphuric acid is applied to the entrapment of the sulfur dioxide in the flue gas, the production of the carbon base nitrogen-insulating gas preparation and calcium carbonate of oxygen + carbon dioxide is applied to the entrapment of the carbon base of carbon dioxide in the system acid tail gas, retrieve the waste heat among the calcination process, it is combustion-supporting to adopt the carbon base nitrogen-insulating gas substitution air of oxygen + carbon dioxide simultaneously, finally realize substituting the utilization of ardealite (principal ingredients are calcium sulfate dihydrate) with the calcium carbonate product resource utilization, sulfur dioxide and the carbon dioxide entrapment and cyclic utilization that will generate, realize the green low carbon utilization and the low carbon comprehensive utilization of the fossil energy and ardealite, and has the green, the environmental protection, energy-saving great significance.
8. The utility model is suitable for a newly-built supporting or transformation supporting of phosphogypsum calcining furnace types such as rotary kiln calcining furnace, fluidized bed pyrolysis furnace, vertical pyrolysis furnace.
Drawings
Fig. 1 is a schematic diagram of the system structure (fluidized bed gasification furnace) of the present invention.
Fig. 2 is a schematic diagram of the system structure of the present invention (pulverized coal gasification furnace).
FIG. 3 is a schematic view of the system structure of the present invention (water-coal-slurry gasification furnace).
Fig. 4 is a schematic diagram of the system structure (natural gas supply device) of the present invention.
The device comprises a reduction section 1 of the phosphogypsum calcining furnace, a dehydration section 2 of the phosphogypsum calcining furnace, a flue gas waste heat recovery device 3, a flue gas dust removal device 4, a sulfuric acid production device 5, a flue gas cooling device 6, a flue gas fan I7, an oxygen preparation device 8, a carbon-based nitrogen-insulating gas mixer I9, a calcium carbonate production device 10, a nitrogen-free gas dust removal device 11, a flue gas fan II12, a carbon-based nitrogen-insulating gas mixer II13, a fluidized bed gasification furnace 14, a pulverized coal gasification furnace 15, a coal water slurry gasification furnace 16 and a natural gas supply device 17.
Detailed Description
The invention is further explained below with reference to examples and figures. The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
The utility model relates to a reaction mechanism:
(1) Coal/coke powder gasification reaction (fluidized bed gasifier, pulverized coal gasifier, coal water slurry gasifier):
2C+O 2 →2CO
C+H 2 O→CO+H 2
C+CO 2 →2CO
(2) Nitrogen-insulating combustion reaction (reduction section of phosphogypsum calcining furnace):
2CO+O 2 →2CO 2
2H 2 +O 2 →2H 2 O
when the fuel is natural gas, the reaction firstly occurs:
CH 4 +1/2O 2 →CO+2H 2
CH 4 +H 2 O→CO+3H 2
CH 4 +CO 2 →2CO+2H 2
and (3) carrying out a reaction again:
2CO+O 2 →2CO 2
2H 2 +O 2 →2H 2 O
(3) Phosphogypsum dehydration (phosphogypsum calciner dehydration section) and calcination (phosphogypsum calciner reduction section) reaction:
dehydration reaction CaSO 4 ·2H 2 O→CaSO 4 +2H 2 O
Calcination reaction CaSO 4 +CO→CaO+SO 2 +CO 2
CaSO 4 +H 2 →CaO+SO 2 +H 2 O
(4) Sulfuric acid production reaction (sulfuric acid production apparatus):
2SO 2 +O 2 →2SO 3
SO 3 +H 2 O→H 2 SO 4
(5) Calcium carbonate production reaction (calcium carbonate production apparatus):
CaO+CO 2 →CaCO 3
a comprehensive utilization system of phosphogypsum is shown in figures 1-4 and comprises a fuel supply device, a reduction section 1 of a phosphogypsum calcining furnace, a dehydration section 2 of the phosphogypsum calcining furnace, a flue gas waste heat recovery device 3, a flue gas dust removal device 4, a sulfuric acid production device 5, a flue gas cooling device 6, a flue gas fan I7, an oxygen preparation device 8, a carbon-based nitrogen-insulating gas mixer I9 and a calcium carbonate production device 10.
The fuel supply device is used for supplying fuel to the reduction section 1 of the phosphogypsum calcining furnace; the fuel is nitrogen-free gas or natural gas, wherein the nitrogen-free gas is prepared by fluidized bed gasification, pulverized coal gasification or coal water slurry gasification; the method is determined according to the conditions of local coal quality, coal price, natural gas price, device scale and the like, and factors such as which is most economical and appropriate and is suitable for local examination and approval policies are considered.
The fuel is nitrogen-free gas, and when the fuel is prepared by fluidized bed gasification, the fuel supply device comprises a fluidized bed gasification furnace 14, a flue gas fan II12, a carbon-based nitrogen-insulating gas mixer II13 and a nitrogen-free gas dust removal device 11;
the fluidized bed gasification furnace 14 is used for generating a partial oxidation-reduction reaction (gasification reaction) by taking proper lump coal as a raw material, part of steam produced by the flue gas waste heat recovery device 3 as an oxidant and carbon-based nitrogen-insulating gas prepared by the carbon-based nitrogen-insulating gas mixer II13 as a gasification agent to generate a crude synthesis gas, namely nitrogen-free fuel gas; typical gas components (according to dry basis and volume percentage) are 38 to 42 percent of hydrogen, 30 to 33 percent of carbon monoxide, 18 to 22 percent of carbon dioxide, 3 to 5 percent of methane and 2 to 5 percent of nitrogen, and the pressure is 0.2 to 1.0MPa;
the flue gas fan II12 is used for pressurizing and conveying the cooled part of flue gas to the carbon-based nitrogen-insulating gas mixer II13;
the carbon-based nitrogen-insulating gas mixer II13 is used for mixing part of the oxygen prepared by the oxygen preparation device 8 with the flue gas conveyed by the flue gas fan II12 to prepare carbon-based nitrogen-insulating gas; according to the requirement of the fluidized bed gasification furnace 14, the oxygen and the flue gas (CO) entering the carbon-based nitrogen-insulating gas mixer II13 are controlled 2 ) Flow, adjusting the oxygen concentration of the carbon-based nitrogen-insulating gas to 21-45 v%; the structure of the carbon-based nitrogen-insulating gas mixer II13 can adopt the structure of the carbon-based nitrogen-insulating gas mixer in CN202111466784.3 patent;
the nitrogen-free gas dust removal device 11 is used for removing dust from the nitrogen-free gas sent out from the fluidized bed gasification furnace 14; the nitrogen-free gas dust removal device 11 is preferably a cyclone dust removal device;
a lump coal outlet of the lump coal supply device is connected with the fluidized bed gasification furnace 14, and a steam outlet of the flue gas waste heat recovery device 3 is also connected with the fluidized bed gasification furnace 14; the flue gas outlet of the flue gas cooling device 6 is also connected with a flue gas fan II12, the flue gas outlet of the flue gas fan II12 is connected with a carbon-based nitrogen-insulating gas mixer II13, and a flow regulating valve is arranged on a connecting pipeline between the flue gas outlet of the flue gas fan II12 and the carbon-based nitrogen-insulating gas mixer II13; the oxygen outlet of the oxygen preparation device 8 is also connected with a carbon-based nitrogen-insulating gas mixer II13, and a flow regulating valve is arranged on the connecting pipeline; a carbon-based nitrogen insulation gas outlet of the carbon-based nitrogen insulation gas mixer II13 is connected with the fluidized bed gasification furnace 14, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline; the nitrogen-free gas outlet of the fluidized bed gasification furnace 14 is connected with the nitrogen-free gas dust removal device 11, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device 11 is connected with the reduction section 1 of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline between the nitrogen-free gas outlet of the nitrogen-free gas dust removal device 11 and the reduction section 1 of the phosphogypsum calcining furnace.
The fuel is nitrogen-free gas, and when the fuel is prepared by gasifying pulverized coal, the fuel supply device comprises a pulverized coal gasification furnace 15 and a nitrogen-free gas dust removal device 11;
a pulverized coal gasification furnace 15 for generating a partial oxidation-reduction reaction (gasification reaction) to generate a raw synthesis gas, i.e., a nitrogen-free fuel gas, using pulverized coal (pulverized coal produced by fossil energy sources such as raw material coal and coke breeze) as a raw material, using a part of steam produced by the flue gas waste heat recovery device 3 as an oxidant, and using a part of oxygen produced by the oxygen production device 8 as a gasification agent; typical gas components (according to dry basis and volume percentage) are 28 to 32 percent of hydrogen, 57 to 62 percent of carbon monoxide, 9 to 11 percent of carbon dioxide, and about 0.5 percent of methane and nitrogen, and the pressure is 0.2 to 1.0MPa;
the nitrogen-free gas dust removal device 11 is used for removing dust from the nitrogen-free gas sent out from the pulverized coal gasification furnace 15; the nitrogen-free gas dust removal device 11 is preferably a cyclone dust removal device;
a coal powder outlet of the coal powder supply device is connected with a pulverized coal gasification furnace 15, a steam outlet of the flue gas waste heat recovery device 3 is also connected with the pulverized coal gasification furnace 15, an oxygen outlet of the oxygen preparation device 8 is also connected with the pulverized coal gasification furnace 15, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the oxygen outlet of the oxygen preparation device 8 and the pulverized coal gasification furnace 15; a nitrogen-free gas outlet of the pulverized coal gasification furnace 15 is connected with a nitrogen-free gas dust removal device 11, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device 11 is connected with the phosphogypsum calcining furnace reduction section 1, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device 11 and the phosphogypsum calcining furnace reduction section 1.
The fuel is nitrogen-free fuel gas, and when the coal water slurry is gasified and prepared, the fuel supply device comprises a coal water slurry gasification furnace 16 and a nitrogen-free fuel gas dust removal device 11;
a coal water slurry gasification furnace 16 for generating a partial oxidation-reduction reaction (gasification reaction) to generate a raw synthesis gas, i.e., a nitrogen-free fuel gas, using coal water slurry (which is prepared from fossil energy such as raw material coal, coke breeze and water) as a raw material and using part of the oxygen prepared by the oxygen preparation device 8 as a gasification agent; typical gas components (according to dry basis and volume percentage) are 42 to 46 percent of hydrogen, 35 to 38 percent of carbon monoxide, 17 to 20 percent of carbon dioxide, and about 0.5 percent of methane and nitrogen, and the pressure is 0.2 to 1.0MPa;
the nitrogen-free gas dust removal device 11 is used for removing dust from the nitrogen-free gas sent out from the coal water slurry gasification furnace 16; the nitrogen-free gas dust removal device 11 is preferably a cyclone dust removal device;
a coal water slurry outlet of the coal water slurry supply device is connected with the coal water slurry gasification furnace 16, an oxygen outlet of the oxygen preparation device 8 is also connected with the coal water slurry gasification furnace 16, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the oxygen outlet of the oxygen preparation device 8 and the coal water slurry gasification furnace 16; the nitrogen-free gas outlet of the water-coal-slurry gasification furnace 16 is connected with the nitrogen-free gas dust removal device 11, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device 11 is connected with the reduction section 1 of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline between the nitrogen-free gas outlet of the nitrogen-free gas dust removal device 11 and the reduction section 1 of the phosphogypsum calcining furnace.
When the fuel is natural gas, the fuel supply device is a natural gas supply device 17, the natural gas supply device 17 is connected with the phosphogypsum calcining furnace reduction section 1, and a flow regulating valve is arranged on a connecting pipeline.
And the phosphogypsum calcining furnace reduction section 1 is used for calcining the dehydrated phosphogypsum into calcium oxide.
And the phosphogypsum calcining furnace dehydration section 2 is used for dehydrating phosphogypsum by using the smoke generated by the phosphogypsum calcining furnace reduction section 1.
The flue gas waste heat recovery device 3 is used for recovering the flue gas waste heat sent out by the dehydration section 2 of the phosphogypsum calcining furnace and generating steam as a byproduct; the flue gas waste heat recovery device 3 is preferably a waste heat boiler.
The flue gas dust removal device 4 is used for removing dust from the flue gas after waste heat recovery; the flue gas dust removal device 4 is preferably a cyclone dust removal device.
And the sulfuric acid production device 5 is used for capturing sulfur dioxide in the flue gas after waste heat recovery and dust removal so as to produce a sulfuric acid product.
The flue gas cooling device 6 is used for cooling the flue gas sent out by the sulfuric acid production device 5; the flue gas cooling device 5 is preferably a water cooling device, and is indirectly cooled by circulating water.
And the flue gas fan I7 is used for pressurizing and conveying the cooled part of flue gas to the carbon-based nitrogen-insulating gas mixer I9.
An oxygen producing device 8 for producing oxygen; the oxygen preparation device 8 adopts a deep cooling method or a pressure swing adsorption method to prepare oxygen with the purity of more than 90v% and the pressure of 0.05-0.2 MPa.
The carbon-based nitrogen-insulating gas mixer I9 is used for mixing part of the oxygen prepared by the oxygen preparation device 8 with the flue gas conveyed by the flue gas fan I7 to prepare carbon-based nitrogen-insulating gas; according to the requirement of the reduction section 1 of the phosphogypsum calcining furnace, oxygen and flue gas (CO) entering a carbon-based nitrogen-insulating gas mixer I9 are controlled 2 ) Flow, adjusting the oxygen concentration of the carbon-based nitrogen-insulating gas to 21-45 v%; the structure of the carbon-based nitrogen-insulating gas mixer I9 can adopt the structure of the carbon-based nitrogen-insulating gas mixer in CN202111466784.3 patent.
And the calcium carbonate production device 10 is used for recovering part of the cooled flue gas and calcium oxide sent out from the reduction section 1 of the phosphogypsum calcining furnace to produce calcium carbonate.
The method comprises the following steps that a fuel outlet of a fuel supply device is connected with a reduction section 1 of a phosphogypsum calcining furnace, a calcium oxide outlet of the reduction section 1 of the phosphogypsum calcining furnace is connected with a calcium carbonate production device 10, a flue gas outlet of the reduction section 1 of the phosphogypsum calcining furnace is connected with a dehydration section 2 of the phosphogypsum calcining furnace, a phosphogypsum outlet of the phosphogypsum supply device is connected with the dehydration section 2 of the phosphogypsum calcining furnace, a dehydrated phosphogypsum outlet of the dehydration section 2 of the phosphogypsum calcining furnace is connected with the reduction section 1 of the phosphogypsum calcining furnace, and a flue gas outlet of the dehydration section 2 of the phosphogypsum calcining furnace is connected with a flue gas waste heat recovery device 3; the steam product outlet of the flue gas waste heat recovery device 3 is connected with the steam utilization device, and the flue gas outlet of the flue gas waste heat recovery device 3 is connected with the flue gas dust removal device 4; a flue gas outlet of the flue gas dust removal device 4 is connected with a sulfuric acid production device 5, a sulfuric acid product outlet of the sulfuric acid production device 5 is connected with a sulfuric acid storage device, and a flue gas outlet of the sulfuric acid production device 5 is connected with a flue gas cooling device 6; the flue gas outlet of the flue gas cooling device 6 is respectively connected with a flue gas fan I7 and a calcium carbonate production device 10, and the flue gas cooling device 6 is also provided with a flue gas emptying pipeline; the flue gas outlet of the flue gas fan I7 is connected with a carbon-based nitrogen-insulating gas mixer I9, and a flow regulating valve is arranged on the connecting pipeline; an oxygen outlet of the oxygen preparation device 8 is respectively connected with the carbon-based nitrogen-insulating gas mixer I9 and the sulfuric acid production device 5, and flow regulating valves are arranged on connecting pipelines; the carbon-based nitrogen-insulating gas outlet of the carbon-based nitrogen-insulating gas mixer I9 is connected with the reduction section 1 of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline.
The comprehensive utilization of the phosphogypsum by utilizing the system comprises the following steps:
1) In the initial stage, air is used for supporting combustion in a reduction section 1 of a phosphogypsum calciner, low-load empty burning is carried out on fuel, after smoke is generated, the smoke enters a dehydration section 2 of the phosphogypsum calciner to heat, remove adsorbed water and part of crystal water from the phosphogypsum, and then the dehydrated phosphogypsum is sent to the reduction section 1 of the phosphogypsum calciner to be calcined into calcium oxide; and carbon-based nitrogen-insulating gas prepared by mixing the treated flue gas and oxygen is used for gradually replacing air to support combustion, after a period of circulation, the carbon-based nitrogen-insulating gas completely replaces air to support combustion, the carbon-based nitrogen-insulating gas supports combustion and enters a normal operation state, and the reduction section 1 of the phosphogypsum calcining furnace also enters a normal load operation state;
2) Dehydrating and reducing calcining phosphogypsum: introducing flue gas from a reduction section 1 of a phosphogypsum calciner into a dehydration section 2 of the phosphogypsum calciner to heat the phosphogypsum to 750-850 ℃ to remove adsorbed water and part of crystal water, sending the dehydrated phosphogypsum into the reduction section 1 of the phosphogypsum calciner, reducing and calcining the dehydrated phosphogypsum into calcium oxide at 1000-1100 ℃ by taking nitrogen-free gas or natural gas as fuel and carbon-based nitrogen-insulating gas as combustion improver, and sending the calcium oxide into a calcium carbonate production device 10;
3) Flue gas waste heat recovery: introducing the flue gas from the dehydration section 2 of the phosphogypsum calcining furnace into a flue gas waste heat recovery device 3 for waste heat recovery and byproduct steam, wherein the temperature of the flue gas after waste heat recovery is 400-430 ℃, and the steam is sent into a steam utilization device;
4) Flue gas dust removal: sending the flue gas after waste heat recovery into a flue gas dust removal device for dust removal 4;
5) Production of sulfuric acid: conveying flue gas (the main components of carbon dioxide, sulfur dioxide and a small amount of inert gases such as nitrogen) subjected to waste heat recovery and dust removal into a sulfuric acid production device 5 to produce sulfuric acid products, specifically, oxidizing the sulfur dioxide in the flue gas into sulfur trioxide by oxygen, absorbing the sulfur trioxide by 98wt% of concentrated sulfuric acid to obtain fuming sulfuric acid with the concentration of more than 100%, and then preparing the fuming sulfuric acid into sulfuric acid products such as concentrated sulfuric acid and dilute sulfuric acid, wherein the temperature of the flue gas discharged from the sulfuric acid production device 5 is 80-100 ℃, the main component of the flue gas is carbon dioxide, the content of the carbon dioxide is more than 95v%, and a small amount of inert gases such as nitrogen are contained; the carbon dioxide is used as circulating flue gas, after long-time circulation, nitrogen is accumulated and increased, and part of circulating gas can be released to the atmosphere periodically to ensure the balance of the nitrogen content in the circulating gas;
6) Cooling flue gas: the main component of the flue gas from the sulfuric acid production device 5 is carbon dioxide, the carbon dioxide is introduced into a flue gas cooling device 6 for cooling, and the temperature of the flue gas from the flue gas cooling device 6 is 40-60 ℃;
7) Recycling the treated flue gas: part of the cooled flue gas is sent into a flue gas fan I, and is mixed with part of oxygen prepared by an oxygen preparation device 8 to prepare carbon-based nitrogen-insulating gas which is used as a combustion improver and is sent into a reduction section 1 of the phosphogypsum calcining furnace; the cooled smoke part is sent into a calcium carbonate production device 10 to react with calcium oxide to produce calcium carbonate, the purity of the calcium carbonate is 80-90 wt%, and the calcium carbonate can be directly used as a raw material of cement clinker, a raw material of building prefabricated parts, a raw material of artificial plates and an aggregate of concrete, and can be further purified to obtain a microcrystalline calcium carbonate product.
Claims (9)
1. A comprehensive utilization system of phosphogypsum is characterized by comprising a fuel supply device, a reduction section of a phosphogypsum calcining furnace, a dehydration section of the phosphogypsum calcining furnace, a flue gas waste heat recovery device, a flue gas dust removal device, a sulfuric acid production device, a flue gas cooling device, a flue gas fan I, an oxygen preparation device, a carbon-based nitrogen-insulating gas mixer I and a calcium carbonate production device;
the fuel supply device is used for supplying fuel to the reduction section of the phosphogypsum calcining furnace;
the phosphogypsum calcining furnace reduction section is used for calcining the dehydrated phosphogypsum into calcium oxide;
the phosphogypsum calcining furnace dehydration section is used for dehydrating phosphogypsum by using the smoke generated by the phosphogypsum calcining furnace reduction section;
the flue gas waste heat recovery device is used for recovering the flue gas waste heat sent out from the dehydration section of the phosphogypsum calcining furnace and generating byproduct steam;
the flue gas dust removal device is used for removing dust from the flue gas after waste heat recovery;
the sulfuric acid production device is used for collecting sulfur dioxide in the flue gas after waste heat recovery and dust removal so as to produce a sulfuric acid product;
the flue gas cooling device is used for cooling the flue gas sent out by the sulfuric acid production device;
the flue gas fan I is used for pressurizing and conveying the cooled part of flue gas to the carbon-based nitrogen-insulating gas mixer I;
the oxygen preparation device is used for preparing oxygen;
the carbon-based nitrogen-insulating gas mixer I is used for mixing part of the oxygen prepared by the oxygen preparation device with the flue gas conveyed by the flue gas fan I to prepare carbon-based nitrogen-insulating gas;
the calcium carbonate production device is used for recovering part of the cooled flue gas and calcium oxide sent out from the reduction section of the phosphogypsum calcining furnace to produce calcium carbonate;
the method comprises the following steps that a fuel outlet of a fuel supply device is connected with a reduction section of a phosphogypsum calcining furnace, a calcium oxide outlet of the reduction section of the phosphogypsum calcining furnace is connected with a calcium carbonate production device, a flue gas outlet of the reduction section of the phosphogypsum calcining furnace is connected with a dehydration section of the phosphogypsum calcining furnace, a phosphogypsum outlet of the phosphogypsum supply device is connected with the dehydration section of the phosphogypsum calcining furnace, a dehydrated phosphogypsum outlet of the dehydration section of the phosphogypsum calcining furnace is connected with the reduction section of the phosphogypsum calcining furnace, and a flue gas outlet of the dehydration section of the phosphogypsum calcining furnace is connected with a flue gas waste heat recovery device; the steam product outlet of the flue gas waste heat recovery device is connected with the steam utilization device, and the flue gas outlet of the flue gas waste heat recovery device is connected with the flue gas dust removal device; the flue gas outlet of the flue gas dust removal device is connected with a sulfuric acid production device, the sulfuric acid product outlet of the sulfuric acid production device is connected with a sulfuric acid storage device, and the flue gas outlet of the sulfuric acid production device is connected with a flue gas cooling device; the flue gas outlet of the flue gas cooling device is respectively connected with a flue gas fan I and a calcium carbonate production device, and the flue gas cooling device is also provided with a flue gas emptying pipeline; a flue gas outlet of the flue gas fan I is connected with the carbon-based nitrogen-insulating gas mixer I, and a flow regulating valve is arranged on the connecting pipeline; an oxygen outlet of the oxygen preparation device is respectively connected with the carbon-based nitrogen-insulating gas mixer I and the sulfuric acid production device, and flow regulating valves are arranged on connecting pipelines; and a carbon-based nitrogen-insulating gas outlet of the carbon-based nitrogen-insulating gas mixer I is connected with a reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline.
2. The comprehensive phosphogypsum utilization system according to claim 1, wherein the fuel supply device comprises a fluidized bed gasification furnace, a flue gas fan II, a carbon-based nitrogen-insulating gas mixer II and a nitrogen-free gas dust removal device;
the fluidized bed gasification furnace is used for generating partial oxidation reduction reaction to generate crude synthesis gas, namely nitrogen-free fuel gas, by taking lump coal as a raw material, taking part of steam produced by the flue gas waste heat recovery device as an oxidant and taking carbon-based nitrogen-insulating gas prepared by the carbon-based nitrogen-insulating gas mixer II as a gasification agent;
the flue gas fan II is used for pressurizing and conveying the cooled part of flue gas to the carbon-based nitrogen-insulating gas mixer II;
the carbon-based nitrogen-insulating gas mixer II is used for mixing part of the oxygen prepared by the oxygen preparation device with the flue gas conveyed by the flue gas fan II to prepare carbon-based nitrogen-insulating gas;
the nitrogen-free gas dust removal device is used for removing dust from the nitrogen-free gas sent out from the fluidized bed gasification furnace;
a lump coal outlet of the lump coal supply device is connected with the fluidized bed gasification furnace, and a steam outlet of the flue gas waste heat recovery device is also connected with the fluidized bed gasification furnace; the flue gas outlet of the flue gas cooling device is also connected with a flue gas fan II, the flue gas outlet of the flue gas fan II is connected with a carbon-based nitrogen-insulating gas mixer II, and a flow regulating valve is arranged on a connecting pipeline between the flue gas outlet of the flue gas fan II and the carbon-based nitrogen-insulating gas mixer II; the oxygen outlet of the oxygen preparation device is also connected with a carbon-based nitrogen-insulating gas mixer II, and a flow regulating valve is arranged on the connecting pipeline; a carbon-based nitrogen insulation gas outlet of the carbon-based nitrogen insulation gas mixer II is connected with the fluidized bed gasification furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on the connecting pipeline; the nitrogen-free gas outlet of the fluidized bed gasification furnace is connected with the nitrogen-free gas dust removal device, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device and the reduction section of the phosphogypsum calcining furnace.
3. The comprehensive phosphogypsum utilization system according to claim 1, wherein the fuel supply device comprises a pulverized coal gasification furnace and a nitrogen-free gas dust removal device;
the pulverized coal gasification furnace is used for generating a crude synthesis gas, namely a nitrogen-free fuel gas, by taking pulverized coal as a raw material, taking part of steam produced by the flue gas waste heat recovery device as an oxidant and taking part of oxygen produced by the oxygen production device as a gasification agent, and performing partial oxidation-reduction reaction;
the nitrogen-free gas dust removal device is used for removing dust from the nitrogen-free gas sent out by the pulverized coal gasification furnace;
the coal powder outlet of the coal powder supply device is connected with the pulverized coal gasification furnace, the steam outlet of the flue gas waste heat recovery device is also connected with the pulverized coal gasification furnace, the oxygen outlet of the oxygen preparation device is also connected with the pulverized coal gasification furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the oxygen outlet of the oxygen preparation device and the pulverized coal gasification furnace; the nitrogen-free gas outlet of the pulverized coal gasification furnace is connected with the nitrogen-free gas dust removal device, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device and the reduction section of the phosphogypsum calcining furnace.
4. The comprehensive phosphogypsum utilization system according to claim 1, wherein the fuel supply device comprises a coal water slurry gasification furnace and a nitrogen-free gas dust removal device;
the coal water slurry gasification furnace is used for generating partial oxidation-reduction reaction to generate crude synthesis gas, namely nitrogen-free fuel gas by taking coal water slurry as a raw material and taking partial oxygen prepared by the oxygen preparation device as a gasification agent;
the nitrogen-free gas dust removal device is used for removing dust from the nitrogen-free gas sent out by the water-coal-slurry gasification furnace;
the coal water slurry outlet of the coal water slurry supply device is connected with the coal water slurry gasification furnace, the oxygen outlet of the oxygen preparation device is also connected with the coal water slurry gasification furnace, and a flow meter, a temperature sensor, a pressure sensor, an oxygen purity detector and a flow regulating valve are arranged on a connecting pipeline of the oxygen outlet of the oxygen preparation device and the coal water slurry gasification furnace; the nitrogen-free gas outlet of the water-coal-slurry gasification furnace is connected with a nitrogen-free gas dust removal device, the nitrogen-free gas outlet of the nitrogen-free gas dust removal device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow meter, a temperature sensor, a pressure sensor and a flow regulating valve are arranged on a connecting pipeline of the nitrogen-free gas outlet of the nitrogen-free gas dust removal device and the reduction section of the phosphogypsum calcining furnace.
5. The comprehensive utilization system of phosphogypsum as claimed in claim 2, 3 or 4, wherein the nitrogen-free gas dust-removing device is a cyclone dust-removing device.
6. The comprehensive phosphogypsum utilization system according to claim 1, wherein the fuel supply device is a natural gas supply device, the natural gas supply device is connected with the reduction section of the phosphogypsum calcining furnace, and a flow regulating valve is arranged on a connecting pipeline.
7. The comprehensive utilization system of phosphogypsum as claimed in claim 1, wherein the flue gas waste heat recovery device is a waste heat boiler.
8. The comprehensive phosphogypsum utilization system according to claim 1, wherein the flue gas dust removal device is a cyclone dust removal device.
9. The comprehensive phosphogypsum utilization system according to claim 1, wherein the flue gas cooling device is a water cooling device.
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| CN115925295B (en) * | 2022-11-26 | 2024-04-26 | 上海源晗能源技术有限公司 | Phosphogypsum comprehensive utilization method |
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Denomination of utility model: A comprehensive utilization system for phosphogypsum Effective date of registration: 20231018 Granted publication date: 20230303 Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Pudong branch Pledgor: SHANGHAI YUANHAN ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2023310000653 |