CN106595227A - Ammonium chloride drying and cooling system and process - Google Patents
Ammonium chloride drying and cooling system and process Download PDFInfo
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- CN106595227A CN106595227A CN201611062124.8A CN201611062124A CN106595227A CN 106595227 A CN106595227 A CN 106595227A CN 201611062124 A CN201611062124 A CN 201611062124A CN 106595227 A CN106595227 A CN 106595227A
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- Prior art keywords
- ammonium chloride
- dried
- cooling
- gas
- ammonia
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- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 title claims abstract description 333
- 235000019270 ammonium chloride Nutrition 0.000 title claims abstract description 165
- 238000001816 cooling Methods 0.000 title claims abstract description 163
- 238000001035 drying Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 80
- 239000007789 gas Substances 0.000 claims abstract description 144
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 140
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 79
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 70
- 238000010521 absorption reaction Methods 0.000 claims abstract description 47
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 39
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 38
- 239000007787 solid Substances 0.000 claims abstract description 24
- 239000006227 byproduct Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 7
- 238000011084 recovery Methods 0.000 claims abstract 2
- 239000000428 dust Substances 0.000 claims description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 238000011010 flushing procedure Methods 0.000 claims description 22
- 239000004531 microgranule Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229910001868 water Inorganic materials 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 239000000047 product Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 7
- 150000003863 ammonium salts Chemical class 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 230000004087 circulation Effects 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 3
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 230000017531 blood circulation Effects 0.000 claims description 2
- 239000000112 cooling gas Substances 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims 1
- 239000006096 absorbing agent Substances 0.000 description 9
- 230000018044 dehydration Effects 0.000 description 7
- 238000006297 dehydration reaction Methods 0.000 description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 4
- 238000005660 chlorination reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004094 preconcentration Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002453 shampoo Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
- F26B3/084—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed with heat exchange taking place in the fluidised bed, e.g. combined direct and indirect heat exchange
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D1/00—Devices using naturally cold air or cold water
- F25D1/02—Devices using naturally cold air or cold water using naturally cold water, e.g. household tap water
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/005—Treatment of dryer exhaust gases
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to an ammonium chloride drying and cooling system. The ammonium chloride drying and cooling system comprises a dryer and a cooler and is integrated with a first absorption device, wherein the first absorption device is designed to be used for capturing a solid and gas mixture in exhaust stream of the dryer and converting the solid and gas mixture into byproducts of solids, liquid and gases. The invention further relates to an ammonium chloride drying and cooling process, which comprises a drying step, an absorption step and a cooling step after finish of ammonium chloride drying, wherein in the absorption step, ammonia and carbon dioxide in circulating air are subjected to wet recovery by a washing process and a condensing process, and the solid and gas mixture in the circulating air is captured and converted into the byproducts of solids, liquid and gases.
Description
Technical field
The present invention relates to a kind of ammonium chloride is dried and cooling system.Moreover, it relates to a kind of corresponding ammonium chloride
It is dried and cooling technique.
Background technology
Ammonium chloride, the product being for example taken as when integrated soda production carries out soda manufacture, generally by ammonia and chloride salt
Produce, salt is also containing other ions from process upstream chain, such as sodium ion and carbonic acid hydrogen ion.Ammonia chloride craft is generally wrapped
Containing crystallisation by cooling, mechanical dehydration and the heat-force dry as main technological steps and cooling, it is easy to store, packs to obtain
With shipment be dried ammonium chloride.
Mechanical dehydration is carried out using filtering centrifuge typically, with countercurrent drier and cooler to the chlorine through mechanical dehydration
Changing ammonium carries out heat-force dry and cooling.Generally, they are fluid bed dryer and fluid bed cooler, the fluid bed dryer
The heat exchanger surface for conduct heat (be dried and cool down), immersion fluosolids is utilized with fluid bed cooler.With pure with to draining off
Dry to compare with cooling, fluidization is lower to the gas flow that waste gas stream is provided, therefore generally more energy efficient.
The ammonia chloride crystal of the ammonium chloride crystallisation by cooling production of integrated soda production is typically suspended in mother solution salt, salt mother solution
Comprising ammonium chloride, other ammonium salts, Sodium Chloride and dissolve in the ammonia in water.After mechanical dehydration, these side-product components generally with 3% to
15% ratio is sticked on ammonia chloride crystal.Wash filter cake to be possible to reduce the impurity of adhesion in dehydration, but can not be sufficient
It is enough effectively to ensure substantially reducing for ammonia and CO2 emission in dry run.Additionally, would generally be because ammonium chloride be in water
High-dissolvability and bring the loss of obvious ammonium chloride product.
Subsequent heat-force dry process can really remove the ammonia in moisture and ammonia in crystal.Additionally, by drying machine
The thermal decomposition of the ammonium salt (such as ammonium carbonate) under high temperature state, release carbon dioxide, water and ammonia.
In this way, by the exhaust stream during heat-force dry, ammonia and carbon dioxide are discharged into air in a large number
In.Although ammonia can be removed to a certain extent by the washing process of acidic cleaning device.But the efficiency of washing process has
Limit, and need to carry out acid reaction with other materials, acid reaction unavoidably produces the sewage discharge for needing further to process.
Additionally, the carbon dioxide in exhaust stream is diluted, and it is discharged to air.
The content of the invention
Therefore, the technical problem to be solved is to provide a kind of ammonium chloride to be dried and cooling system, the chlorination
Ammonium is dried and undesirable solid and gaseous compound in drying machine aerofluxuss can be captured by cooling system and changes into solid
Body, liquids and gases side-product.These side-products can be recycled, and (such as in connection alkali work in other production processes
In skill) it is recycled.The ammonium chloride is dried can substantially reduce the capacity of ammonia and carbon dioxide with cooling system.
Above-mentioned technical problem is dried by a kind of ammonium chloride as described below and cooling system is solved.The ammonium chloride is done
Dry and cooling system includes：Drying machine, in the drying machine, wet ammonium chloride is heated to technological temperature, produces water vapour, and
Ammonia, water and carbon dioxide are discharged in ammonium salt thermal decomposition；Cooler, the cooler are designed to cool down and complete dry chlorination
Ammonium, obtains dry ammonium chloride product；Wherein, the ammonium chloride is dried and cooling system is integrated with the first absorption plant, and described first inhales
Receiving apparatus be designed to the solid and admixture of gas captured in the exhaust stream of the drying machine and convert them to solid,
The side-product of liquids and gases, wherein, the ammonium chloride is dried and cooling system is included for dry gas system, the drying
Machine and first absorption plant are included in the gas system for drying, wherein, the row of first absorption plant
Gas is supplied to back the drying machine to form the gas circulation in dry gas system.
Ammonium chloride of the invention be dried and cooling system a kind of preferred implementing form, the drying machine and described cold
But at least one of machine is the mixed form between convection type or contact, or convection type and contact.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, the drying machine and cooler
At least one of be equipped with immersion fluidised prods layer heat exchanger fluid bed.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and first absorption plant is
The condenser in the drying machine downstream is arranged in, the condenser is designed to be suitable to reclaim ammonia and the wet type of carbon dioxide is reclaimed
Device.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the condenser is designed to
It is suitable to while playing a part of scrubber.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the ammonium chloride is dried and cold
But system also includes the single scrubber being arranged between the drying machine and the condenser.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the ammonium chloride is dried and cold
But system is additionally included in first dust arrester of the drying machine arranged downstream in the condenser upstream, the first dedusting dress
Put the dry type retracting device for being designed to be suitable to reclaim the microgranule from the drying machine.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and first dust arrester is
If individually bag filter or single cyclone separator or in any way some cyclone separator of series and parallel with
The combination of dry bag filter.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, described for dry gas
System also includes one or more blower fans for compressed recycle gas body.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, under the condenser
Trip, was disposed with the heater for heat cycles air-flow before the drying machine.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the ammonium chloride is dried and cold
But system includes stripper plant, and the stripper plant is designed to remove between the microgranule of Production of Ammonium Chloride stream in volume
The ammonia of ammonia, the ammonia of surface adsorption and capillary attraction, and be the self-contained unit outside the cooler.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the ammonium chloride is dried and cold
But system includes stripper plant, and the stripper plant is used for ammonia of the removing between the microgranule of Production of Ammonium Chloride stream in volume, table
The ammonia of the ammonia and capillary attraction of face absorption, and be the ingredient of the cooler.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the ammonium chloride is dried and cold
But system also includes the gas system for cooling, and the stripper plant is comprised in the gas system for cooling.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, the gas for cooling
System also includes the second dust arrester for being arranged in the cooler downstream.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, the gas for cooling
One or more blower fans for compressed recycle gas body are there also is provided in system.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, the gas for cooling
System is open system or blood circulation.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the cooler is contact
, the gas for cooling after the ammonium chloride drying and cooling system is flowed through is directly entered air or processes through absorption
Air is entered afterwards.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, and the ammonium chloride is dried and cools down
System also includes the device for providing controlled flushing gas stream, the flushing gas stream by vapor, carbon dioxide, ammonia, nitrogen,
One kind in air is constituted containing the mixture of one or more in vapor, carbon dioxide, ammonia, nitrogen, air.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling system, through the stripper plant
Afterwards, the flushing gas stream is supplied in the gas system for drying or as excess air in the second absorption plant
In be processed.
In process aspect, above-mentioned technical problem is dried by a kind of ammonium chloride and cooling technique is solved.The ammonium chloride
It is dried and cooling technique includes：Drying steps, in the drying steps, wet ammonium chloride quilt in for dry gas system
Technological temperature is heated to, the ammonia produced in the water vapour of generation and decomposition reaction and carbon dioxide enter described for dry gas
Circulating current in system system；Absorption step, in absorption step, is carried out to the ammonia and carbon dioxide in the circulating current wet
Formula is reclaimed, and is captured solid and admixture of gas in the circulating current and is converted them to the pair of solid, liquids and gases
Product；Cooling step, in the cooling step, cooling has completed dry ammonium chloride, obtains dry ammonium chloride product.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, in the absorption step
Washing process is realized in condensation process.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, and the washing process is described
Independent step before absorption step.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, is additionally included in the dry step
After rapid, the first dust removal step before the absorption step, first dust removal step is for reclaiming from described dry
The dry type recycling step of the microgranule of dry step.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, and first dust removal step is led to
Cross single bag filter or single cyclone separator or in any way some cyclone separator of series and parallel with
The combination of some bag filters is performing.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, also presses including one or more
Contracting step, in the compression step, with one or more blower fan compression circulating air in dry gas system
Stream.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, also including heating stepses,
In the heating stepses, circulating current was heated before drying steps are reentered.
Ammonium chloride of the invention be dried and cooling technique a kind of preferred implementing form, also including cooling step outside
Independent stripping process, in the stripping process, remove ammonia between the microgranule of Production of Ammonium Chloride stream in volume, table
The ammonia of the ammonia and capillary attraction of face absorption.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, is additionally included in cooling step
The stripping process for carrying out simultaneously, in the stripping process, ammonia of the removing between the microgranule of Production of Ammonium Chloride stream in volume,
The ammonia of the ammonia and capillary attraction of surface adsorption.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, and the stripping process is being used for
Carry out in the gas system of cooling.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, is additionally included in the cooling step
Second dust removal step in rapid downstream, second dust removal step are returned for reclaiming the dry type of the microgranule from the cooling step
Receive step.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, also presses including one or more
Contracting step, in the compression step, with the air-flow in one or more described gas systems for cooling of blower fan compression.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, the aerofluxuss of the condensation process
A part become the circulating current for being recycled to the drying steps, and remaining non-circulating current is then controllably emitted into
Excess air stream.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, adopts in the cooling step
Cooler for contact, for cooling gas through the ammonium chloride be dried and cooling technique after be directly entered it is big
Gas enters air after absorption is processed.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, also includes to the dry step
The rinsing step of controlled flushing gas stream is provided at least one of rapid and described cooling step gas system, it is described controlled
Flushing gas stream by the one kind in vapor, carbon dioxide, ammonia, nitrogen, air or contain vapor, carbon dioxide, ammonia, nitrogen
The mixture composition of several gases in gas, air.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, leaves described ammonium chloride and does
Other of the factory that the excess air for mainly containing water vapour, carbon dioxide, ammonia, nitrogen and oxygen is located of dry and cooling technique
Production technology is recycled or is discharged to air.
Ammonium chloride of the invention is dried a kind of preferred implementing form with cooling technique, also absorbs step including second
Suddenly, the excess air was absorbed described second before being recycled or being discharged to air by other production technologies of place factory
Process through one or multi-step absorption in step.
Fig. 1 shows the schematic diagram of the ammonium chloride drying and cooling system reclaimed with solid, liquids and gases side-product.
The ammonium chloride is dried and cooling system includes：Drying machine, in the drying machine, wet ammonium chloride is heated to technological temperature, produces
Water vapour simultaneously produces ammonia and carbon dioxide in decomposition reaction；Cooler, the cooler are designed to cooling and have completed drying
Ammonium chloride, obtain dry ammonium chloride product.The ammonium chloride is dried and cooling system is also included for dry gas system, described
For including drying machine, the first dust arrester, the first absorption plant in dry gas system.Wet ammonium chloride is fed into drying
Machine, here, drying machine 2 is the fluid bed dryer with immersion heat exchanger, but can also adopt any other form
Drying machine.Ammonium chloride is heated to technological temperature in drying machine 2, and moisture is evaporated, the ammonia produced in decomposition reaction and dioxy
Change carbon to be diluted, into drying machine exhaust stream.Drying machine exhaust stream then passes through the dry state carried out in the first dust arrester and removes
Dirt and the wet dust removal carried out in the first absorption plant.Here, the first absorption plant is designed to capture the drying machine
Exhaust stream in solid and admixture of gas convert them to the side-product of solid, liquids and gases.Then, a part
It is circulated back in drying machine again, and the gas that another part is not circulated then is discharged as excess air.Chlorination in drying machine
After ammonium completes to be dried, it is transported in cooler and is cooled down, so as to obtain dry ammonium chloride product.
It should be appreciated that in schematic diagram shown in Fig. 1, for the first dust arrester is included in dry gas system, but
According to the difference of process conditions, dust arrester as arranging before absorption plant is not required in that.Accordingly it is also possible to
Design in a kind of form of implementation of deformation it is a kind of only include drying machine and absorption plant for dry gas system.
In addition, in schematic diagram shown in Fig. 1, dried ammonium chloride is transported in cooler and is cooled down.Cooler
Type and model here arbitrarily can select.The cooler of the mixed form of common convection type, contact and both
Can be used for implementing technical scheme.When being cooled down using convection type cooler, the cooler is in use
In the gas system of cooling, and this gas system for being used for cooling can be the gas system of the closed loop for wherein having recyclegas
System, or aerofluxuss are directly entered air or after treatment into the opening gas system of air.Adopting contact
When cooler is cooled down, as the work of contact cooler itself need not introduce gas.Therefore, the cooler is just no longer
It is used in the gas system of cooling in one.
As shown in figure 1, the solid in recyclegas is mainly reclaimed in above-mentioned dry state dedusting (function of the first dust arrester)
Microgranule, and wet dust removal (function of the first absorption plant) then removes ammonium salt in recyclegas, other salt, dissolved ammonia, dissolving
Carbon dioxide, water.
Description of the drawings
Fig. 1 is schematically illustrated with solid, the ammonium chloride drying of liquids and gases side-product recovery and cooling technique
Schematic diagram；
Fig. 2 schematically illustrates ammonium chloride shown in Fig. 1 and is dried a kind of preferred implementing form with cooling technique, and which carries defeated
Enter to the flushing gas in the gas system of drying machine and/or cooler.
Specific embodiment
Fig. 2 shows that the ammonium chloride with the flushing gas being input in the gas system of drying machine and/or cooler is done
Dry and cooling system.
The ammonium chloride is dried and cooling system includes：Drying machine, here are the fluid bed dryings with immersion heat exchanger
Machine；In the drying machine, wet ammonium chloride is heated to technological temperature, and moisture is evaporated, the ammonia produced in decomposition reaction and dioxy
Change carbon to be diluted, into drying machine exhaust stream；Cooler, the cooler are designed to cool down and complete dry ammonium chloride,
Obtain dry ammonium chloride.Here, drying machine is the fluid bed dryer with immersion heat exchanger, but can also using it is any its
The drying machine of its form.
In addition, there is the ammonium chloride that various ways can prepare the present invention to be dried and the ammonium chloride raw material needed for cooling system.
In the embodiment depicted in figure 2, ammonium chloride of the invention is dried and the ammonium chloride raw material (wet ammonium chloride) needed for cooling system passes through
It is prepared by centrifuge, the centrifuge for carrying out mechanical dehydration to obtain wet ammonium chloride filter cake to ammonium chloride suspension, filter from
Scheming 1 can be furnished with or be unworthy of filter cake flushing.Filter cake is directly sent into drying machine 2 or drying machine 2 is sent into after conveyer.
As shown in Fig. 2 ammonium chloride is dried with cooling system also including separate for dry gas system and for cold
But gas system；Wherein, it is described for including drying machine, the first dust arrester in dry gas system, wherein, it is described dry
Dry machine is dried to the centrifuge dehydration product from the centrifuge, first dust arrester be designed to be suitable to reclaim from
The drying machine brings the dry type retracting device of the microgranule of the closed-loop gas system into.The ammonium chloride carried in drying machine exhaust stream
Microgranule is substantially excluded in so-called dry state dust removal step.Be usually used cyclone separator and/or bag filter as with
In the first dust arrester 3 of dry state dedusting.
Similar to the explanation to Fig. 1, although in the embodiment depicted in figure 2, for including in dry gas system
First dust arrester, but dust arrester as arranging before absorption plant is not required in that.Those skilled in the art
Other variant embodiments without the first dust arrester can be proposed according to the different of process conditions completely.
The ammonium chloride is dried and cooling system is also integrated with the first absorption plant, and first absorption plant is designed to
Capture solid and admixture of gas in the exhaust stream of the drying machine and convert them to the by-product of solid, liquids and gases
Product, here it include scrubber 5 and condenser 6.
Scrubber 5 performs so-called wet dust removal step.Scrubber 5 can be the integrated component of condenser 6, or
Independently of the other part of condenser 6.In the case where scrubber 5 is other individual components, it is particularly advantageous in realizing so
Secondary process goal：The maximum pre-concentration device that scrubber 5 is used as ammonium chloride only is remaining after dry state dust removal step to dissolve
Particulate Emission.
Condenser 6 is run using the cooling liquid again of circulation at least in part, and for removing the steaming of gas phase in drying machine 2
Shampoo point.Cooling down again for liquid is to remove the gas in condensation heat, the heat of solution for removing vapour and removal condenser 6
Body and solid.Complete to cool down again using cooling water and/or chilled water.
Condenser 6 plays a part of the absorber of carbon dioxide and ammonia, the main ammonia removed in gas return path simultaneously.Condensation
Device/absorber can be single stage type or multi-stag.
In gas return path, the partial pressure of carbon dioxide is higher, by the operation temperature of the gas phase and solid phase of condenser/absorber
Degree is lower, then the ammonia concentration for leaving condenser/absorber into excess air and/or drying machine is lower.
In this form of implementation, a part for the aerofluxuss of condenser/absorber becomes the circulating air for being recycled to drying machine 2
Stream, and remaining non-circulating current is then controllably emitted into excess air stream, to be further processed.
Optionally, the circulating current of condenser/absorber output is further compressed in the second blower fan 7.Generally, exist
Before drying machine 2 is again introduced into as fluidizing gas, above-mentioned circulating current is heated to appearance in an indirect gas heater 8
Perhaps or possible hot air temperature.
The dry ammonium chloride for leaving drying machine 2 removes most ammonia in product by a stripper plant.Stripper plant
Operation adopts non-active gas, such as carbon dioxide, nitrogen, air, low concentration of water steam and low concentration ammonia.Stripper plant appoint
Business is the ammonia for exchanging volume and surface and capillary attraction between microgranule.In the form of implementation, stripper plant is cooling
The ingredient of machine 9, cooler 9 are run in closed-loop gas system.
In other variant embodiment, cooler 9 can also be designed to open in gas system, now, pass through
The gas of cooler cooling is directly discharged in air or (is for example being absorbed through one the similar 3rd processing through absorption
In the absorption plant of device) after be directly discharged in air.
Here, cooler 9 is the fluid bed cooler for being furnished with immersion heat exchanger, using cooling water or chilled water or other
Coolant runs.The exhaust stream of cooler 9 is cleaned microgranule in microgranule dust removal step, and the second cleaner unit 10 is cyclone separator
And/or bag filter.One or more the 3rd blower fans 11 are used to recompress the fluidizing gas of cooler 9.
Similar with mentioned above, the cooler in embodiment illustrated in fig. 2 can also have above-mentioned in other variant embodiments
Multiple choices outside fluid bed cooler, heat exchange mode either convection type, contact, or both mixed forms any
.
The ammonium chloride product of cooling is discharged from cooler 9, for further storing and processing.
Here, controlled rinses air-flow for desired technique is realized in drying machine and/or cooler gas system
Condition.In this example, select carbon dioxide as controlled flushing air-flow, it is possible to use air, nitrogen, carbon dioxide or this
Any mixture of several gases.It is desirable to reduce carbon dioxide in cooling and/or dry gas system using such mixture
Partial pressure.
Especially in Sodium Carbonate Plant, it is favourable as controlled flushing air-flow from carbon dioxide, because in main technique stream just
There is available carbon dioxide.Equally, in integrated soda production factory, main technique stream also has available nitrogen.
Flushing gas is reserved as cleaning the compressed gas of bag filter and introduces dry and cooling air circuit.If
The flushing gas ratio of needs by bag filter introduce it is more, then required gas flow be preferably introduced into cooler gas return
Road, so that ammonia dilution/steam stripped maximum efficiency is realized in cooler 9 itself.
Drying machine gas return path (as shown in Figure 2) is introduced into from the excess air of cooler 9, or is directly added
To in the carbon dioxide recycle or nitrogen circulation of place factory, or optionally in the carbon dioxide recycle for adding place factory or
It is processed (not shown in Fig. 2) in absorber independent in addition before nitrogen circulation, or situation about allowing in selected process conditions
It is lower to be directly discharged into air.
The excess air of drying machine gas system is rich in carbon dioxide or is rich in nitrogen, but ammonia content is few.Can be further
Ammonia content, or the carbon dioxide recycle for directly adding place factory are reduced in the second absorber 12.
Technical scheme as an alternative, the excess air of the gas return path of drying machine 2 and cooler 9 are discharged to air.According to
The process conditions and temperature of condenser and the second absorber 12, can be in line if ammonia content is low, after otherwise further processing directly
Enter air.
Dust arrester in the system and technique of the present invention, either in the gas system for drying still for cold
But, used in gas system, there can be the form of implementation of various replacements, for example, single bag filter, individually
Cyclone separator, some cyclone separator of series connection, some cyclone separator in parallel, series and parallel is some in any way
The combination of cyclone separator and single bag filter.
The blower fan of the present invention is used to promoting gas motion in the loop and overcomes the pressure drop that produces in gas system.It
Can equally there are various different modification forms of implementation.It is possible, firstly, to for dry gas system and/or for cooling
A Fans are arranged only in gas system, it is also possible to arrange many Fans wherein, these blower fans may be at gas return path
Optional position.Secondly, although for improving the consideration of ammonia absorbance preferably by wind turbine layout before condenser/absorption plant,
But such step can cause higher power consumption.Therefore, in condenser, former and later two positions are respectively arranged as illustrated in fig. 2
Blower fan just becomes a kind of efficiency and the preferred of cost is traded off.
The present invention's is designed to closed-loop gas system for dry gas system and the gas system for cooling down, real
The protection to greatest extent to environment is showed.It is noted that first, in the present invention, so-called closed-loop gas system is not
It is 100% closing, still allows for the inflow of flushing gas and the outflow of excess air, only flushing gas and excess air
Amount it is very insignificant compared with the gas content of total gas stream of gas system.Next, is cooling in stripper plant
In the case of separate part outside machine, stripper plant can use flushing gas, and flushing gas leaves stripping in carrying ammonia
Can be fed into after device described for dry gas system or the process that is absorbed in a separate step.Now, by
Device is stripped in most of ammonia to remove, thus cooler gas system can be open systemss, can now arrange more than one
Individual blower fan.In addition, using single stripper plant and in the case that cooler is contact, without the need for the gas system of cooling
System, without the blower fan in the gas system for cooling arranged as described above and/or dry dust removal apparatus.
It will be appreciated by those skilled in the art that said system and technique may have several modifications, to adapt to different showing
The order of priority of time target in field process conditions and special process device.
More than describe the preferred embodiments of the present invention, but the spirit and scope of the present invention be not limited to it is disclosed herein
Particular content.Those skilled in the art can it is of the invention teaching and make more embodiments and application, these realities
Apply mode and application would be within the spirit and scope of the present invention.The spirit and scope of the present invention not by specific embodiment limiting,
And be defined by the claims.
Reference numerals list
1 centrifuge
2 drying machines
3 first dust arresters
4 first blower fans
5 scrubbers
6 condensers
7 second blower fans
8 heaters
9 coolers
10 second dust arresters
11 the 3rd blower fans
12 second absorption plants
The wet ammonium chloride of A
The dry ammonium chloride of B
C solid particles are reclaimed
D ammonium salts, other salt, dissolved ammonia, dissolved carbon dioxide, water
E ammonium chloride solutions
F cleanout fluid
G ammonium chloride suspensions
H flushing gas.
Claims (36)
1. a kind of ammonium chloride is dried and cooling system, and which includes：
Drying machine, in the drying machine, wet ammonium chloride is heated to technological temperature, produces water vapour, and in ammonium salt thermal decomposition
Release ammonia, water and carbon dioxide；
Cooler, the cooler are designed to cool down and complete dry ammonium chloride, obtain dry ammonium chloride product；
Characterized in that,
The ammonium chloride is dried and cooling system is integrated with the first absorption plant, and first absorption plant is designed to capture institute
State solid and admixture of gas in the exhaust stream of drying machine and convert them to the side-product of solid, liquids and gases,
Wherein, the ammonium chloride is dried and cooling system includes that, for dry gas system, the drying machine and described first is inhaled
Receiving apparatus be included in it is described in dry gas system, wherein, described in the aerofluxuss of first absorption plant are supplied to back
Drying machine is circulated with forming the gas in dry gas system.
2. ammonium chloride according to claim 1 is dried and cooling system, it is characterised in that the drying machine and the cooling
At least one of machine is the mixed form between convection type or contact, or convection type and contact.
3. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that in the drying machine and cooler
At least one be equipped with immersion fluidised prods layer heat exchanger fluid bed.
4. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that first absorption plant is cloth
The condenser in the drying machine downstream is put, the condenser is designed to be suitable to reclaim ammonia and the wet type of carbon dioxide reclaims dress
Put.
5. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that the condenser is designed to fit
Play a part of scrubber in simultaneously.
6. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that the ammonium chloride is dried and cools down
System also includes the single scrubber being arranged between the drying machine and the condenser.
7. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that the ammonium chloride is dried and cools down
System is additionally included in first dust arrester of the drying machine arranged downstream in the condenser upstream, first dust arrester
It is designed to the dry type retracting device for being suitable to reclaim the microgranule from the drying machine.
8. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that first dust arrester is single
Only bag filter or single cyclone separator or in any way some cyclone separator of series and parallel with it is some
Bag filter combination.
9. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that described for dry gas system
System also includes one or more blower fans for compressed recycle gas body.
10. ammonium chloride according to claim 2 is dried and cooling system, it is characterised in that in the downstream of the condenser,
The heater for heat cycles air-flow is disposed with before the drying machine.
11. ammonium chloride according to claim 2 are dried and cooling system, it is characterised in that the ammonium chloride is dried and cold
But system includes stripper plant, and the stripper plant is designed to remove between the microgranule of Production of Ammonium Chloride stream in volume
The ammonia of ammonia, the ammonia of surface adsorption and capillary attraction, and be the self-contained unit outside the cooler.
12. ammonium chloride according to claim 2 are dried and cooling system, it is characterised in that the ammonium chloride is dried and cold
But system includes stripper plant, and the stripper plant is used for ammonia of the removing between the microgranule of Production of Ammonium Chloride stream in volume, table
The ammonia of the ammonia and capillary attraction of face absorption, and be the ingredient of the cooler.
13. ammonium chloride according to claim 11 or 12 are dried and cooling system, it is characterised in that the ammonium chloride is dried
Also include the gas system for cooling with cooling system, the stripper plant is comprised in the gas system for cooling
It is interior.
14. ammonium chloride according to claim 13 are dried and cooling system, it is characterised in that the gas for cooling
System also includes the second dust arrester for being arranged in the cooler downstream.
15. ammonium chloride according to claim 13 are dried and cooling system, it is characterised in that the gas for cooling
One or more blower fans for compressed recycle gas body are there also is provided in system.
16. ammonium chloride according to claim 13 are dried and cooling system, it is characterised in that the gas for cooling
System is open system or blood circulation.
17. ammonium chloride according to claim 11 are dried and cooling system, it is characterised in that the cooler is contact
, the gas for cooling after the ammonium chloride drying and cooling system is flowed through is directly entered air or processes through absorption
Air is entered afterwards.
18. ammonium chloride according to claim 11 or 12 are dried and cooling system, it is characterised in that the ammonium chloride be dried and
Cooling system also includes the device for providing controlled flushing gas stream, the flushing gas stream by vapor, carbon dioxide, ammonia,
One kind in nitrogen, air or the mixture group containing one or more in vapor, carbon dioxide, ammonia, nitrogen, air
Into.
19. ammonium chloride according to claim 18 are dried and cooling system, it is characterised in that through the stripper plant
Afterwards, the flushing gas stream is supplied in the gas system for drying or as excess air in the second absorption plant
In be processed.
A kind of 20. ammonium chloride are dried and cooling technique, and which includes：
Drying steps, in the drying steps, wet ammonium chloride is heated to technological temperature in for dry gas system,
The ammonia produced in the water vapour of generation and decomposition reaction and carbon dioxide enter the circulation in dry gas system
Air-flow；
Absorption step, in absorption step, carries out wet type recovery to the ammonia and carbon dioxide in the circulating current, and capture is described
Solid and admixture of gas in circulating current simultaneously convert them to the side-product of solid, liquids and gases；
Cooling step, in the cooling step, cooling has completed dry ammonium chloride, obtains dry ammonium chloride product.
21. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that in the absorption step
Washing process is realized in condensation process.
22. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that the washing process is described
Independent step before absorption step.
23. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that be additionally included in the dry step
After rapid, the first dust removal step before the absorption step, first dust removal step is for reclaiming from described dry
The dry type recycling step of the microgranule of dry step.
24. ammonium chloride according to claim 23 are dried and cooling technique, it is characterised in that first dust removal step is led to
Cross single bag filter or single cyclone separator or in any way some cyclone separator of series and parallel with
The combination of some bag filters is performing.
25. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that also press including one or more
Contracting step, in the compression step, with one or more blower fan compression circulating air in dry gas system
Stream.
26. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that also including heating stepses,
In the heating stepses, circulating current was heated before drying steps are reentered.
27. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that outside also including cooling step
Independent stripping process, in the stripping process, remove ammonia between the microgranule of Production of Ammonium Chloride stream in volume, table
The ammonia of the ammonia and capillary attraction of face absorption.
28. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that be additionally included in cooling step
The stripping process for carrying out simultaneously, in the stripping process, ammonia of the removing between the microgranule of Production of Ammonium Chloride stream in volume,
The ammonia of the ammonia and capillary attraction of surface adsorption.
29. ammonium chloride according to claim 27 or 28 are dried and cooling technique, it is characterised in that the stripping process exists
Carry out in gas system for cooling.
30. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that be additionally included in the cooling step
Second dust removal step in rapid downstream, second dust removal step are returned for reclaiming the dry type of the microgranule from the cooling step
Receive step.
31. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that also press including one or more
Contracting step, in the compression step, with the air-flow in one or more described gas systems for cooling of blower fan compression.
32. ammonium chloride according to claim 21 or 22 are dried and cooling technique, it is characterised in that the condensation process
A part for aerofluxuss becomes the circulating current for being recycled to the drying steps, and remaining non-circulating current is then controllably arranged
Put to excess air stream.
33. ammonium chloride according to claim 27 are dried and cooling technique, it is characterised in that adopt in the cooling step
Cooler for contact, for cooling gas through the ammonium chloride be dried and cooling technique after be directly entered it is big
Gas enters air after absorption is processed.
34. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that also include to the dry step
The rinsing step of controlled flushing gas stream is provided at least one of rapid and described cooling step gas system, it is described controlled
Flushing gas stream by the one kind in vapor, carbon dioxide, ammonia, nitrogen, air or contain vapor, carbon dioxide, ammonia, nitrogen
The mixture composition of several gases in gas, air.
35. ammonium chloride according to claim 20 are dried and cooling technique, it is characterised in that leave described ammonium chloride and do
Other of the factory that the excess air for mainly containing water vapour, carbon dioxide, ammonia, nitrogen and oxygen is located of dry and cooling technique
Production technology is recycled or is discharged to air.
36. ammonium chloride according to claim 35 are dried and cooling technique, it is characterised in that also absorb step including second
Suddenly, the excess air was absorbed described second before being recycled or being discharged to air by other production technologies of place factory
Process through one or multi-step absorption in step.
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