CN110040733A - A kind of process units and method of oxygen thermal method calcium carbide - Google Patents
A kind of process units and method of oxygen thermal method calcium carbide Download PDFInfo
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- CN110040733A CN110040733A CN201910319892.4A CN201910319892A CN110040733A CN 110040733 A CN110040733 A CN 110040733A CN 201910319892 A CN201910319892 A CN 201910319892A CN 110040733 A CN110040733 A CN 110040733A
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- rotary kiln
- calcium carbide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/90—Carbides
- C01B32/914—Carbides of single elements
- C01B32/942—Calcium carbide
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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
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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
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- Inorganic Chemistry (AREA)
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The present invention relates to the process units and method of a kind of oxygen thermal method calcium carbide, device includes rotary kiln, gasifying furnace, limekiln and CO2Recyclable device.The offgas outlet of rotary kiln is connected to gasifying furnace by injector, and gasifying furnace recycles CO2Outlet is connected to the CO in limekiln all the way2Entrance is connected to the circulation CO of rotary kiln all the way2Entrance.The exhanst gas outlet in limekiln is connected to CO all the way2Recyclable device is connected to the injection gas import of injector all the way.Calcium carbide tail gas and pure oxygen burning generate CO in gasifying furnace2And H2O, the product CO with coal dust and pure oxygen burning2And H2O merges from circulation CO2Outlet discharge enters rotary kiln heating and calcining carbide raw material all the way and produces calcium carbide, and another way enters lime shaft kiln production lime.The present invention combines production calcium carbide by gasifying furnace, rotary kiln and limekiln and lime, the high-temperature flue gas that coal gasification obtains improve coal heat type heat utilization rate to calcium carbide kiln and limekiln heat supply, reduce coal-fired consumption.
Description
Technical field
The invention belongs to the energy and mineral manufacture field, are related to the process units and method of a kind of oxygen thermal method calcium carbide.
Technical background
Calcium carbide production energy consumption is high, and traditional calcium carbide production method is electrothermal way, i.e., former from calcium carbide by electrically heated method
Material obtains calcium carbide product.The specific gravity that the Energy Consumption Cost of calcium carbide production accounts for total cost of production is larger, belongs to high energy consumption industry.Cause
Electricity is secondary energy sources (heat utilization rate of thermal power generation is about 30% ~ 40%), and electrothermal way production calcium carbide will lead to the production of calcium carbide
Cost is high, and industrial calcium carbide is made to lack competitiveness on the market.The production of coal gasification calcium carbide is not exclusively fired with coal or coke
It burns (high-temperature gasification) and heat is provided, eliminate the limitation of generating efficiency, provided theoretically to improve the utilization rate of non-renewable energy
A possibility that.
The carbon in carbide raw material can be consumed in the calcium carbide production environment of the great amount of carbon dioxide generated of burning at high temperature
(CO2+ C=2CO).Because other oxidants in calcium carbide reaction system may consume the carbon or calcium carbide that can be used as reducing agent, institute
It must be carried out in reducing atmosphere with the generation reaction of calcium carbide.It can produce high-purity with the imperfect combustion of coal or coke
CO gas, and heat required for calcium carbide produces is provided.By heat chemistry it is found that the standard enthalpy of formation of CO is less than CO2's
30%, same heat is provided, imperfect combustion usually consumes more carbon raw materials (coke or coal).
When the outlet temperature of calcium carbide tail gas is set as 1500 DEG C, CO is used2High-temperature gasification with the mixture of pure oxygen as coal
When agent, fuel the consumption of coal is 5.8 times as carbide raw material coal.Under above-mentioned operating condition, consumed by the production of coal gasification calcium carbide
The coal overwhelming majority has been used as fuel, and fuel be actually used in calcium carbide production ratio it is very low.This is because after calcium carbide unit
Gasification gas is present in the CO in high-temperature tail gas, and leaves system for producing calcium carbide, and coal-fired energy is mainly with calcium carbide tail gas sensible heat
System for producing calcium carbide has been discharged with the form of the combustion heat.To guarantee that certain calcium carbide yield only increases Coal Gasification amount, this is just
It is very high to be bound to cause coal-fired consumption.Therefore, the fuel availability of coal gasification calcium carbide production how is improved, fuel is reduced and disappears
Consumption, becomes technical problem urgently to be resolved.
Summary of the invention
The object of the present invention is to provide a kind of process units of oxygen thermal method calcium carbide, obtain high temperature CO by gasifying furnace2
To calcium carbide production equipment and limekiln direct heating, the temperature of coal gasification is controlled using circulation of tail gas, improves coal heat type heat benefit
With rate, coal-fired consumption is reduced.The object of the present invention is to provide a kind of methods of oxygen thermal method calcium carbide production.
The technical scheme is that
A kind of process units of oxygen thermal method calcium carbide, including rotary kiln, raw material cabin and products transportation vehicle, the rotary kiln are equipped with tail gas
Outlet, feed(raw material)inlet, circulation CO2Entrance and products export, the raw material cabin are connect with feed(raw material)inlet, and raw material cabin adds equipped with raw material
Entrance, the products export are connected to products transportation vehicle by calcium carbide waste-heat recovery device, described device be equipped with gasifying furnace,
Limekiln and CO2Recyclable device.The gasifying furnace is equipped with circulation CO2Outlet, injector, slag notch and nozzle, the injection
Device is equipped with the import of injection gas, CO2Injection entrance and jet port, the jet port are connected to gasifying furnace, and the slag notch is logical
It crosses lime-ash waste-heat recovery device and is connected to slag bath.The offgas outlet of the rotary kiln is connected to CO2Injection entrance.The limekiln
Equipped with CO2Entrance and exhanst gas outlet, the circulation CO of the gasifying furnace2Outlet is divided into two-way, passes through CO all the way2Circulation line
It is connected to the circulation CO of rotary kiln2Entrance passes through CO all the way2Transfer pipeline is connected to the CO in limekiln2Entrance.The limekiln
Exhanst gas outlet be divided into two-way, be connected to CO all the way2Recyclable device passes through CO all the way2Circulating pump is connected to the injection gas of injector
Import.
The rotary kiln is equipped with kiln head cover, and sealing room is equipped between the kiln head cover and kiln body, and kiln head cover is equipped with circulation CO2
Entrance and products export, the circulation CO2Entrance is located in the middle part of sealing room, and the products export is located at the lower part of sealing room, institute
It states and is sealed into including but not limited to edge of a knife dynamic sealing, it can be using including but not limited to multiple labyrinth seal.The limekiln
Exhanst gas outlet passes through CO all the way2Circulating pump is connected to sealing room all the way.
The nozzle is coaxial sleeve core structure, and the center of nozzle is coal dust channel, is led to around coal dust channel for oxygen
Road.The sealing room can be heavy or multi-sealed with one, can be static seal or dynamic sealing, carbon dioxide, nitrogen gas and water can be used
Steam, inert gas or their mixture carry out gas curtain seals, guarantee that the gas in rotary kiln does not enter atmosphere, atmosphere not into
Enter in rotary kiln.
The limekiln be lime shaft kiln or partition rotary kiln, the lime shaft kiln be beam type kiln, sleeve kiln, double thorax kilns or
Annular is to firing.
The partition rotary kiln is equipped with inlet port and outlet port, and the rotary kiln is equipped with hot charging feed inlet.The partition returns
The hot charging feed inlet that the discharge port of rotary kiln passes through heated conveying piping connection to rotary kiln.
A kind of production method of oxygen thermal method calcium carbide production equipment, raw material enter rotary kiln through feed(raw material)inlet, the coal after drying
Powder, pure oxygen spray into gasifying furnace via nozzle, and calcium carbide tail gas and pure oxygen burning generate CO in gasifying furnace2And H2O, with
The product CO of coal dust and pure oxygen burning2And H2O merges from circulation CO2Outlet discharge, all the way through CO2Circulation line and circulation CO2Enter
Mouth enters rotary kiln heating carbide raw material and produces calcium carbide, and another way is through CO2Transfer pipeline and CO2Entrance enters limekiln sensible heat
Heating and calcining lime stone produces lime.The calcined flue gas in limekiln is divided into two-way through exhanst gas outlet, arrives CO all the way2Recyclable device
The pure CO of Recovery Purifying2, another way is through CO2Injection working gas is made in the injection gas import of circulating pump to injector.CO2Circulating pump
A part of CO of outlet2Make sealing gas to sealing room.CO of the calcium carbide tail gas of rotary kiln through offgas outlet and injector2Injection
Entrance, which enters gasifying furnace, to be made gas and so expects.Guarantee reasonable circulating flow rate.
The amount of the recyclegas requires determination according to gasification process, and the titanium dioxide in tail gas can be made using the method
Carbon can participate in circulation or not enter injector.The coal dust can be substituted by other carbonaceous materials, in the device into
Row injection, the method for carrying out gas circulation while gasification can be such that the consumption of carbonaceous material significantly reduces.
Coal dust after the drying is by CO2Make carrier gas and enters gasifying furnace through nozzle.
The circulation CO of the gasifying furnace2The CO of outlet2Temperature is 800 DEG C ~ 3000 DEG C.The temperature of the offgas outlet
It is 100 DEG C ~ 2000 DEG C.
The rotary kiln can be applied to any metal smelt, high-temperature calcination, Boiler Steam power generation and other techniques, revolution
Kiln can be replaced by various vertical heater kilns, this vertical heater kiln include but is not limited to be metal smelt, or can
With high-temperature calcination, or can generate electricity.The coal dust can be substituted by other carbonaceous materials, and carrier of coal powder can be dioxy
Change carbon, water vapour, water, nitrogen, helium, argon gas, other inert gases or their mixture.The injector can be by other
As long as the power device that can reach injection purpose substituted.The injector and nozzle are as close as possible in order to coal dust, oxygen
It is sufficiently mixed contact with imflammable gas, increases the reaction efficiency of imflammable gas.The raw material and the original recycled from tail gas
Material is conveyed by carrier gas, is sprayed onto rotary kiln or various vertical heater kilns through feed(raw material)inlet, this process can be made using any
Tail gas carries the method and apparatus that raw material powder goes out rotary kiln or various vertical heater kilns less, to reduce raw material entrained by tail gas
Powder.It is including but not limited to conveyed using raw material by carbon dioxide and other stabilizing gas, is laterally sprayed onto rotary kiln through feed(raw material)inlet
Or on the material inner wall of various vertical heater kiln high-temperature fusions, it is bonded in raw material powder on high-temperature molten material, reduce tail gas
The method of entrained raw material powder.
According to process condition, in the circulation CO of gasifying furnace2Outlet can also retain except CO2And H2A part other than O
Fuel gas, if it were to be so, from CO2Transfer pipeline goes the gas in limekiln to need to increase oxygen progress in limekiln
Afterburning, and these gases are to the circulation CO of rotary kiln2Entrance Shi Jike with afterburning can not also afterburning, be directly entered rotary kiln.
It is no in gasifying furnace to introduce the inert substances such as nitrogen, calcium carbide present invention employs calcium carbide tail gas circulation technology
The percentage composition of carbon monoxide is higher in tail gas (calculating the mass content of CO up to 90% or more according to simulation), passes through gasification
Carbon/oxygen in heating furnace than ingredient, may make coal dust imperfect combustion in gasifying furnace generate carbon monoxide position mainly at
The high-temperature gasification gas divided.Amount by adjusting circulation calcium carbide tail gas can control the temperature that gasifying furnace exports coal gas.Calcium carbide
Unit tail gas concentration is high, can save the expense that its recycling purification or burning recycle.
The process units of oxygen thermal method calcium carbide of the present invention combines production calcium carbide by gasifying furnace, rotary kiln and limekiln
And lime, the high-temperature flue gas that Coal Gasification obtains are controlled to calcium carbide production equipment and limekiln direct heating using circulation of tail gas
The temperature of coal gasification processed improves coal heat type heat utilization rate, reduces coal-fired consumption.The present invention is by adjusting oxygen/carbon ratio tune
The concentration of carbon monoxide in throttled furnace outlet coal gas, compared with low temperature calcium carbide tail gas be recycled to gasifying furnace after can drop
The theoretical temperature combustion of low-carbon element in pure oxygen, until gasifying furnace temperature of exit gas reaches specified value 2200 DEG C ~ 2300
℃.Using injector injection calcium carbide tail gas, the method for carrying out gas circulation while gasification can make the consumption of carbonaceous material
Amount significantly reduces, while can use the usage amount of the carbon dioxide in tail gas and vapor reduction oxygen, realizes titanium dioxide
The zero-emission of carbon, reduces costs simultaneously, realizes environmentally protective production method, while going back the renewable energy of by-product green
Hydrogen.
Detailed description of the invention
Fig. 1 is the schematic diagram of the process units of oxygen thermal method calcium carbide of the present invention；
Fig. 2 is the schematic diagram that rotary kiln of the present invention discharges and seals；
Fig. 3 is the structural schematic diagram of burner of the present invention；
Fig. 4 is the flow diagram of another embodiment of the present invention.
Wherein: 1-gasifying furnace, 2-rotary kilns, 3-offgas outlets, 4-circulation CO2Outlet, 5-tail gas injections enter
Mouth, 6-nozzles, 7-products transportation vehicles, 8-feed(raw material)inlets, 9-circulation CO2Entrance, 10-products exports, 11-CO2Circulation pipe
Road, 12-sealing gland rooms, 13-oxygen channels, 14-kiln head covers, 15-coal dust channels, 16-raw material cabins, 17-CO2Recycling dress
It sets, 18-lime shaft kilns, 19-CO2Transfer pipeline, 20-CO2Entrance, 21-injection gas imports, 22-injectors, 23-CO2
Mouth, the outlet of 26-lime-ash, 27-slag notches, 28-chargings are added in circulating pump, 24-lime-ash waste-heat recovery devices, 25-raw materials
Mouth, 29-discharge ports, 30-hot charging feed inlets, 31-partition rotary kilns, 32-calcium carbide waste-heat recovery devices.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention is described in detail.The scope of protection of the present invention is not limited to the embodiment,
Those skilled in the art make any change within the scope of the claims and also belong to the scope of protection of the invention.
Embodiment 1:
The process units of oxygen thermal method calcium carbide of the present invention is as shown in Figure 1, include rotary kiln 2, gasifying furnace 1, raw material cabin 16, product
Transport vehicle 7, lime shaft kiln 8 and CO2Recyclable device 17.Rotary kiln is equipped with offgas outlet 3, feed(raw material)inlet 8, circulation CO29 He of entrance
Products export 10, products export 10 are connected to products transportation vehicle 7, raw material cabin and feed(raw material)inlet by calcium carbide waste-heat recovery device 32
Connection, raw material cabin are equipped with raw material and mouth 25 are added.Gasifying furnace is equipped with circulation CO2Outlet 4, injector 22, slag notch 27 and spray
Mouth 6, injector 22 are equipped with injection gas import 21, CO2Injection entrance 5 and jet port, jet port are connected to gasifying furnace 1, out
Cinder notch 27 is connected to slag bath by lime-ash waste-heat recovery device 24.The offgas outlet 3 of rotary kiln 2 is connected to the CO of injector2Draw
Entry portal 5.Lime shaft kiln 18 is equipped with CO2Entrance 20 and exhanst gas outlet, the circulation CO of gasifying furnace 12Outlet 4 points be two-way, one
Road passes through CO2Circulation line 11 is connected to the circulation CO of rotary kiln 22Entrance 9, passes through CO all the way2Transfer pipeline 19 is connected to lime
The CO of shaft furnace 182Entrance 20.The exhanst gas outlet of lime shaft kiln 18 is divided into two-way, is connected to CO all the way2Recyclable device 17, a-road-through
Cross CO2Circulating pump 23 is connected to the injection gas import 21 of injector 22.As shown in Fig. 2, rotary kiln is equipped with kiln head cover 14, kiln head cover
Sealing room 12 is equipped between kiln body, kiln head cover is equipped with circulation CO2Entrance 9 and products export 10 recycle CO2Entrance 9 is located at sealing
12 middle part of room, products export 10 are located at the lower part of sealing room 12, are sealed into edge of a knife dynamic sealing.The exhanst gas outlet one of lime shaft kiln 18
Road passes through CO2Circulating pump 23 is connected to sealing room 12.As shown in figure 3, nozzle 6 is coaxial sleeve core structure, the center of nozzle is
Coal dust channel 15 is oxygen channel 13 around coal dust channel.
The production method of the process units of oxygen thermal method calcium carbide of the present invention, carbide raw material are added mouth 25 through raw material and enter raw material cabin
16, the raw material that raw material cabin 16 exports enters rotary kiln 2 through feed(raw material)inlet 8.Coal dust after drying is by CO2Make carrier gas and pure oxygen via
Nozzle 6 sprays into gasifying furnace 1, and coal dust and the pure oxygen completely burned in gasifying furnace 1 generate CO2, the circulation of gasifying furnace 1
CO2The gas temperature control of outlet 4 is 2300 DEG C.CO2Gas is by recycling CO2Outlet 4 is through CO2Circulation line 11 passes through circulation CO2Enter
Mouth 9 enters 2 heating and calcining carbide raw material of rotary kiln, and the material of rotary kiln 2 is heated to 2000 DEG C of generation calcium carbides and tail gas.Liquid
Calcium carbide is through in the calcium carbide pot on products export 10 to products transportation vehicle 7, liquid calcium carbide temperature is 2000 DEG C.Calcium carbide tail gas is through tail gas
Outlet 3 is connected to the tail gas injection entrance 5 of injector 22, and the injection gas outlet spraying cycle of injector 22 enters gasifying furnace
1.The main component of calcium carbide tail gas is CO2、CO、H2And H2O, calcium carbide tail gas and pure oxygen burning generate CO in gasifying furnace 12
And H2O, the product CO with coal dust and pure oxygen burning2And H2O merges from circulation CO2Outlet discharge.A part of CO2Through CO2Circulation pipe
Road 11 and circulation CO2Entrance 9 enters 2 heating and calcining carbide raw material of rotary kiln and produces calcium carbide, another part CO2Through CO2Transfer pipeline
19 and CO2Entrance 20 enters lime shaft kiln 18 and produces lime with sensible heat heating and calcining lime oxide spinel calcium.In lime shaft kiln 18
The CO of heating2The CO generated with calcium carbonate decomposition of limestone2Merge from CO2Outlet discharge, temperature is about 150 DEG C, discharge
CO2Be divided into two tunnels, all the way with CO2Recyclable device 17 connects, CO2Food is made after removing moisture is purified in recyclable device 17
Grade or technical grade CO2Product.All the way with CO2Recovery pump 23 connects, CO2The outlet of recovery pump 23 is divided into two-way, all the way with kiln head cover
14 sealing gland room 12 connects, the CO in sealing gland room 122It can prevent air from entering rotary kiln, while prevent outside the gas in rotary kiln
It lets out；The injection gas import 21 of another way and injector 22 is connected to the working gas of injector.It is discharged from gasifying furnace 1
High-temperature ash enters lime-ash waste-heat recovery device 24, and the lime-ash after recovery waste heat exports 26 outlets from lime-ash and recycles.
The main component of calcium carbide tail gas is CO2、CO、H2And H2O, the mainly CO of gasifying furnace outlet 42And H2O.But according to
Process condition recycles CO in gasifying furnace2Outlet 4 can also retain except CO2And H2A part of fuel gas other than O, if
It is in this case, from CO2Transfer pipeline 19 goes the gas of lime shaft kiln 18 that the increase oxygen in lime shaft kiln 18 is needed to be mended
Combustion, and these gases are to the circulation CO of rotary kiln 229 Shi Jike of entrance with afterburning can not also afterburning, be directly entered rotary kiln 2.
As shown in Fig. 2, the kiln head cover of rotary kiln is fixed when rotary kiln does rotary motion.The liquid electricity flowed out from rotary kiln
Stone first flows into kiln head cover, and from the calcium carbide pot that its underpart flows to products transportation vehicle.The rotary kiln of rotation and fixed kiln hood
Cover keeps certain interval, guarantees not having the solid-state calcium carbide of condensation when rotary kiln stops production for cylinder of rotary kiln and fixed kiln head cover
It is bonded together, does not influence the driving operation of rotary kiln next time.The effect of sealing gland room is that atmospheric air is prevented to enter in rotary kiln.
As shown in figure 3, being entered nozzle by the coal dust and oxygen of carbon dioxide conveying and coal dust and oxygen can be realized from nozzle
Gasifying furnace is sprayed into individual passage, gas-solid material channel is coaxially distributed, and not only can guarantee the safety of material conveying, but also can protect
Exhibit material is sufficiently mixed after spraying into gasifying furnace by injection kinetic energy, is that coal dust and oxygen combustion create necessary condition.Raw material
Powder is conveyed by carbon dioxide, through 8 side of feed(raw material)inlet on the material inner wall for being sprayed onto rotary kiln high-temperature fusion, is bonded in raw material powder
On high-temperature molten material, reduces tail gas and carry raw material powder.
Gasifying furnace recycles CO2The high-temperature heat carrier gas main component of outlet 4 is CO2And H2O, temperature can according to return
The adjustment of rotary kiln design parameter, is in the present embodiment 2300 DEG C, and rotary kiln exhaust gas outlet temperature is 1500 DEG C.The electricity of the present embodiment
Stone yield is that 253 kg/h(purity are 80%, converts into pure 202.3 kg/h of calcium carbide, refers both to 80% industrial calcium carbide below).Calcium carbide is former
Expect anthracitic specification are as follows: phosphorus content be 83% containing ash amount be 10% consumption 140kg/h, the specification of carbide raw material lime are as follows:
CaO content is that 92% free water content is 1.5% consumption 145kg/h.Use proper amount of 1500 DEG C of rotary kiln exhaust gas as following
Ring gas is passed through gasifying furnace 1 simultaneously and after oxygen combustion, and the outlet temperature of gasifying furnace coal gas can be controlled in 2300 DEG C.It returns
Percentage by volume in rotary kiln tail gas containing CO is 25%, CO2Percentage by volume is 50%, H2Volume fraction be 12%, into CO2It returns
150 DEG C of CO of 17 outlet of receiving apparatus2Amount be 213Nm3/ h(418Kg/h), wherein 71Nm3The CO of/h, 139Kg/h2It is lime
Kiln exhaust gas (the CO that Decomposition of Calcium Carbonate generates2), remaining is the CO of 1 outlet of gasifying furnace2Tail gas.By controlling rotary kiln material
Residence time (main by control rotary kiln revolving speed realize) allow solid material to be sufficiently heated in rotary kiln, carbide liquid
Temperature is 1750 DEG C ~ 2000 DEG C.There are enough heat transfer temperature differences (at least 300 DEG C) to release in rotary kiln by the gas phase flowed in kiln
It puts sensible heat and provides chemical reaction heat for calcium carbide production.Recycle CO2The fluid temperature (F.T.) of entrance 9 is 2300 DEG C, the air-flow of offgas outlet 3
When temperature is 1500 DEG C, the coal-fired consumption sprayed into from nozzle 6 is 152kg/h.
Oxygen thermal method calcium carbide production equipment of the present invention generates CO using rotary kiln exhaust gas circulation and pure oxygen burning2, Coal-fired capacity and
Oxygen demand is greatly reduced, and the calcium carbide purity of production is higher.Mass balance shows, it is contemplated that the coal-fired ash after gasifying furnace
70% can be substantially removed by dividing, and the ash content in carbide raw material can be carried by rotary kiln gas and remove 20%, and the purity of calcium carbide is reachable
85%.If suitable iron powder is added into calcium carbide fusant, by carbide liquid lime-ash element silicon and ferro element with the shape of ferrosilicon
Formula removes, and ferro-silicon process can remove the 50%, the 30% of the lime quantity of slag of carbide raw material coal institute dregginess, then the purity of calcium carbide can reach
90% or more.
Pass through CO2Circulating pump, the working gas CO of injection2Injector 22 can not be entered, 6 knot of injector 22 and nozzle
It closes, recyclegas is introduced in gasifying furnace 1 using the carrier gas of nozzle 6 or recyclegas is directly entered gasifying furnace 1
It is interior.According to process condition, can carry out completely heated up all gas being made to become CO in gasifying furnace 12And H2O, can also be into
Row not exclusively heating, in addition to CO2And H2There are also other fuel gas, such as H other than O2And CO.
Calcium carbide is being introduced into calcium carbide waste-heat recovery device 32 into sack for transporting calcium carbide Chinese herbaceous peony, and the energy for recycling waste heat enters figure
1 system, the energy for calcium carbide production.
Embodiment 2:
The process units of oxygen thermal method calcium carbide of the present invention is as shown in figure 4, include rotary kiln 2, gasifying furnace 1, raw material cabin 16, product
Transport vehicle 7, partition rotary kiln 31 and CO2Recyclable device 17.Rotary kiln is equipped with offgas outlet 3, feed(raw material)inlet 8, circulation CO2Entrance 9
With products export 10, products export 10 is connected to products transportation vehicle 7, and raw material cabin is connect with feed(raw material)inlet, and raw material cabin is equipped with raw material
Mouth 25 is added.Gasifying furnace is equipped with circulation CO2Outlet 4, injector 22, slag notch 27 and nozzle 6, injector 22 are equipped with injection
Gas import 21, CO2Injection entrance 5 and jet port, jet port are connected to gasifying furnace 1, and slag notch 27 is returned by lime-ash waste heat
Receiving apparatus 24 is connected to slag bath.The offgas outlet 3 of rotary kiln 2 is connected to the CO of injector2Injection entrance 5.Rotary kiln is equipped with tail
Gas outlet 3, feed(raw material)inlet 8, circulation CO2Entrance 9, hot charging feed inlet 30 and products export 10, partition rotary kiln 31 are equipped with CO2Enter
Mouth 20, exhanst gas outlet, feed inlet 28 and discharge port 29, discharge port 29 are fed by the hot charging of heated conveying piping connection to rotary kiln
Mouth 30.The circulation CO of gasifying furnace 124 points of outlet is two-way, passes through CO all the way2Circulation line 11 is connected to following for rotary kiln 2
Ring CO2Entrance 9, passes through CO all the way2Transfer pipeline 19 is connected to the CO of partition rotary kiln 312Entrance 20.The cigarette of partition rotary kiln 31
Gas outlet is divided into two-way, is connected to CO all the way2Recyclable device 17, passes through CO all the way2Circulating pump 23 is connected to the injection of injector 22
Gas import 21.
The production method of the process units of oxygen thermal method calcium carbide of the present invention, carbide raw material anthracite are added mouth 25 through raw material and enter
Raw material cabin 16, the raw material that raw material cabin 16 exports enter rotary kiln 2 through feed(raw material)inlet 8.Coal dust after drying is by CO2Make carrier gas and pure
Oxygen sprays into gasifying furnace 1 via nozzle 6, and coal dust and the pure oxygen completely burned in gasifying furnace 1 generate CO2, gasification heating
Furnace 1 recycles CO2The gas temperature control of outlet 4 is 2300 DEG C.CO2Gas is by recycling CO2Outlet 4 is through CO2Circulation line 11 is by following
Ring CO2Entrance 9 enters 2 heating and calcining carbide raw material of rotary kiln, and the material of rotary kiln 2 is heated to 2000 DEG C of generation calcium carbides and tail
Gas.The calcium carbide of liquid is through in the calcium carbide pot on products export 10 to products transportation vehicle 7, liquid calcium carbide temperature is 2000 DEG C.Calcium carbide
Tail gas is connected to the tail gas injection entrance 5 of injector 22 through offgas outlet 3, and the injection gas outlet spraying cycle of injector 22 enters
Gasifying furnace 1.The main component of calcium carbide tail gas is CO2、CO、H2And H2O, calcium carbide tail gas and pure oxygen fire in gasifying furnace 1
It burns and generates CO2And H2O, the product CO with coal dust and pure oxygen burning2And H2O merges from circulation CO2Outlet discharge.A part of CO2Through
CO2Circulation line 11 and circulation CO2Entrance 9 enters 2 heating and calcining carbide raw material of rotary kiln and produces calcium carbide, another part CO2Through
CO2Transfer pipeline 19 and CO2Entrance 20 enters the kiln thorax of partition rotary kiln 31, with the lime in sensible heat indirect heating calcining partition
Raw material powdery calcium carbonate produce powdered lime, powdered lime from discharge port come out after, through carbon dioxide conveying hot charging pass through hot charging
Feed inlet 30 enters in rotary kiln 2.Raw material powder and coal dust interval conveyed by carbon dioxide, through 8 side of feed(raw material)inlet to be sprayed onto revolution
It on the material inner wall of kiln high-temperature fusion, is bonded in raw material powder and coal dust on high-temperature molten material, reduces tail gas and carry raw material powder
And coal dust.
The CO of heating in partition rotary kiln 312The CO generated with calcium carbonate decomposition of limestone2Merge from CO2Outlet discharge,
Temperature is about 150 DEG C, the CO of discharge2Be divided into two tunnels, all the way with CO2Recyclable device 17 connects, CO2It is removed in recyclable device 17
Food-grade or technical grade CO are made after moisture is purified2Product.All the way with CO2Recovery pump 23 connects, CO2The outlet of recovery pump 23
It is divided into two-way, is connect all the way with the sealing gland room 12 of kiln head cover 14, and connects with the sealing gland room 12 of the kiln head cover 14 of partition rotary kiln 31
It connects, the CO in sealing gland room 122It can prevent air from entering rotary kiln and partition rotary kiln；The injection gas of another way and injector 22 into
Mouth 21 connects.From gasifying furnace 1 be discharged high-temperature ash enter lime-ash waste-heat recovery device 24, the lime-ash after recovery waste heat from
Lime-ash exports 26 outlets and recycles.
Other technical process are same as Example 1.
Claims (11)
1. a kind of process units of oxygen thermal method calcium carbide, including rotary kiln (2), raw material cabin (16) and products transportation vehicle (7), described time
Rotary kiln is equipped with offgas outlet (3), feed(raw material)inlet (8), circulation CO2Entrance (9) and products export (10), the raw material cabin and raw material
Entrance connection, raw material cabin are equipped with raw material and mouth (25) are added, and the products export (10) is connected by calcium carbide waste-heat recovery device (32)
Products transportation vehicle (7) are connected to, it is characterized in that: described device is equipped with gasifying furnace (1), limekiln and CO2Recyclable device (17)；
The gasifying furnace is equipped with circulation CO2Export (4), injector (22), slag notch (27) and nozzle (6), the injector
(22) injection gas import (21), CO are equipped with2Injection entrance (5) and jet port, the jet port are connected to gasifying furnace (1),
The slag notch (27) is connected to slag bath by lime-ash waste-heat recovery device (24)；The offgas outlet (3) of the rotary kiln (2) is even
It is connected to CO2Injection entrance (5)；The limekiln is equipped with CO2Entrance (20) and exhanst gas outlet, the circulation of the gasifying furnace (1)
CO2Outlet (4) is divided into two-way, passes through CO all the way2Circulation line (11) is connected to the circulation CO of rotary kiln (2)2Entrance (9), all the way
Pass through CO2Transfer pipeline (19) is connected to the CO in limekiln2Entrance (20)；The exhanst gas outlet in the limekiln is divided into two-way, all the way
It is connected to CO2Recyclable device (17), passes through CO all the way2Circulating pump (23) is connected to the injection gas import (21) of injector (22).
2. the process units of oxygen thermal method calcium carbide according to claim 1, it is characterized in that: the rotary kiln is equipped with kiln head cover
(14), sealing room (12) is equipped between the kiln head cover and kiln body, kiln head cover is equipped with circulation CO2Entrance (9) and products export
(10), the circulation CO2Entrance (9) is located in the middle part of sealing room (12), and the products export (10) is located under sealing room (12)
Portion, it is described to be sealed into including but not limited to edge of a knife dynamic sealing, it can be using including but not limited to multiple labyrinth seal；The stone
Ash furnace exhanst gas outlet passes through CO all the way2Circulating pump (23) is connected to sealing room (12) all the way.
3. the process units of oxygen thermal method calcium carbide according to claim 1, it is characterized in that: the nozzle (6) is coaxial sleeve
Formula structure, the center of nozzle are coal dust channel (15), are oxygen channel (13) around coal dust channel；The sealing room (12) can
With one weight or it is multi-sealed, can be static seal or dynamic sealing, can be used carbon dioxide, nitrogen, vapor, inert gas or
Their mixture carries out gas curtain seals, guarantees that the gas in rotary kiln does not enter atmosphere, atmosphere does not enter in rotary kiln.
4. the process units of oxygen thermal method calcium carbide according to claim 1, it is characterized in that: the limekiln is lime shaft kiln
(18) or partition rotary kiln (31), the lime shaft kiln are beam type kiln, sleeve kiln, double thorax kilns or annular to firing.
5. the process units of oxygen thermal method calcium carbide according to claim 4, it is characterized in that: the partition rotary kiln (31) is equipped with
Feed inlet (28) and discharge port (29), the rotary kiln are equipped with hot charging feed inlet (30)；The discharge port of the partition rotary kiln
(29) pass through the hot charging feed inlet (30) of heated conveying piping connection to rotary kiln.
6. a kind of production method of oxygen thermal method calcium carbide production equipment described in claim 1, raw material enter back through feed(raw material)inlet (8)
Rotary kiln (2), it is characterized in that: the coal dust, pure oxygen after dry spray into gasifying furnace (1) via nozzle (6), in gasifying furnace
Calcium carbide tail gas and pure oxygen burning generate CO2And H2O, the product CO with coal dust and pure oxygen burning2And H2O merges from circulation CO2Outlet
(4) it is discharged, all the way through CO2Circulation line (11) and circulation CO2Entrance (9) enters rotary kiln (2) heating carbide raw material production electricity
Stone, another way is through CO2Transfer pipeline (19) and CO2Entrance (20) enters limekiln and produces lime with sensible heat heating and calcining lime stone；
The calcined flue gas in limekiln is divided into two-way through exhanst gas outlet, arrives CO all the way2Recyclable device (17) pure CO of Recovery Purifying2, another
Road is through CO2Injection working gas is made in the injection gas import (21) of circulating pump (23) to injector (22)；CO2Circulating pump (23) outlet
A part of CO2Make sealing gas to sealing room (12)；The calcium carbide tail gas of rotary kiln is through offgas outlet (3) and injector (22)
CO2Injection entrance (5) is made gas into gasifying furnace (1) and is so expected；Guarantee reasonable circulating flow rate.
7. the production method of oxygen thermal method calcium carbide production equipment according to claim 6, it is characterized in that: the recyclegas
Amount according to gasification process require determine, can be allow using the method the carbon dioxide in tail gas participate in circulation and also not
Into injector；The coal dust can be substituted by other carbonaceous materials, carry out injection in the device, be carried out while gasification
The method of gas circulation can be such that the consumption of carbonaceous material significantly reduces.
8. the production method of oxygen thermal method calcium carbide production equipment according to claim 6, it is characterized in that: the coal after the drying
Powder is by CO2Make carrier gas and enters gasifying furnace (1) through nozzle (6).
9. the production method of oxygen thermal method calcium carbide production equipment according to claim 6, it is characterized in that: the gasifying furnace
(1) circulation CO2Export the CO of (4)2Temperature is 800 DEG C ~ 3000 DEG C；The temperature of the offgas outlet (3) is 100 DEG C ~ 2000
℃。
10. the process units of oxygen thermal method calcium carbide according to claim 1, it is characterized in that: the rotary kiln (2) can be applied
It can be by various vertical heaters in any metal smelt, high-temperature calcination, Boiler Steam power generation and other techniques, rotary kiln (2)
Kiln is replaced, this vertical heater kiln include but is not limited to be metal smelt, or can be with high-temperature calcination, or can generate electricity
's；The coal dust can be substituted by other carbonaceous materials, and carrier of coal powder can be carbon dioxide, water vapour, water, nitrogen, helium
Gas, argon gas, other inert gases or their mixture；The injector (22) is as long as can reach injection mesh by others
Power device substituted；The injector (22) and nozzle (6) are as close as possible in order to coal dust, oxygen and flammable gas
Body is sufficiently mixed contact, increases the reaction efficiency of imflammable gas；The raw material and the raw material recycled from tail gas are defeated by carrier gas
It send, is sprayed onto rotary kiln or various vertical heater kilns through feed(raw material)inlet (8), this process can be such that tail gas lacks to take using any
The method and apparatus that carrying raw material powder goes out rotary kiln or various vertical heater kilns, to reduce raw material powder entrained by tail gas；Including
But it is not limited to be conveyed using raw material by carbon dioxide and other stabilizing gas, rotary kiln or each is laterally sprayed onto through feed(raw material)inlet (8)
It on the material inner wall of kind vertical heater kiln high-temperature fusion, is bonded in raw material powder on high-temperature molten material, reduces tail gas and taken
The method of the raw material powder of band.
11. the process units of oxygen thermal method calcium carbide according to claim 1, it is characterized in that: being added according to process condition in gasification
The circulation CO of hot stove2Outlet can also retain except CO2And H2A part of fuel gas other than O, if it were to be so, from CO2
Transfer pipeline (19) goes the gas in limekiln to need to increase in limekiln oxygen and carries out afterburning, and these gases are to rotary kiln
(2) circulation CO2Entrance (9) Shi Jike with afterburning can not also afterburning, be directly entered rotary kiln (2).
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| CN113184852A (en) * | 2021-05-23 | 2021-07-30 | 上海柯来浦能源科技有限公司 | Production device for calcium carbide co-production lime |
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