CN104874253B - A kind of calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesizes device of air - Google Patents

A kind of calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesizes device of air Download PDF

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CN104874253B
CN104874253B CN201510289768.XA CN201510289768A CN104874253B CN 104874253 B CN104874253 B CN 104874253B CN 201510289768 A CN201510289768 A CN 201510289768A CN 104874253 B CN104874253 B CN 104874253B
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calcium carbide
temperature
gas
tail gas
waste heat
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CN104874253A (en
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曹松
阙志建
马委元
韦存福
汪俊锋
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Hongyang Metallurgical Engineering Technology Co Ltd
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Hongyang Metallurgical Engineering Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals

Abstract

Device of air is synthesized the invention discloses a kind of calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production, including the furnace of calcium carbide connected successively with pipeline, high temperature calcium carbide tails dedusting system, calcium carbide tail gas composition reforming system, high temperature calcium carbide tail gas waste heat recovering system, low temperature calcium carbide tail-gas deep cleaning system, the low temperature calcium carbide tail-gas deep cleaning system is provided with gas fan.The dust carried in calcium carbide stove exhaust can be removed at high temperature, recycle calcium carbide stove exhaust high temperature in itself and sulfur-bearing to carry out sulphur-resistant conversion and CO Partial Transformations in tail gas are adjusted into C/Hratio in tail gas, then the waste heat production steam of high-temperature tail gas is reclaimed, the steam of recovery waste heat production simultaneously enters system as conversion steam as the blowback air of high-temperature dust removal again, final purification mixed tail gas, obtains that the pure synthesis gas of the Chemical Manufacture of carbon one requirement can be met.

Description

A kind of calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesizes device of air
Technical field
The present invention relates to calcium carbide stove exhaust energy and resource high-efficiency recycling field, and in particular to a kind of calcium carbide stove exhaust Dry method dust-waste heat recovery-production synthesis device of air.
Background technology
Calcium carbide is basic Organic Chemicals, and China is calcium carbide producing country maximum in the world, but calcium carbide row simultaneously Industry is the industry of highly energy-consuming, high pollution, and calcium carbide stove exhaust Treatment process is all always the problem of calcium carbide industry for many years and is difficult Solve.
Calcium carbide produces calcium carbide by-product furnace gas per ton about 400Nm3, composition of fumes is mainly high temperature CO, and high-temperature furnace gas has in itself Substantial amounts of waste heat is available, at the same be also used as exotic fuels by the use of or as the chemical industry of carbon one raw material utilize.
Calcium carbide stove exhaust temperature is high, complicated component, using, difficulty of governance than larger.The temperature that calcium carbide tail gas is come out of the stove is normal It is 500-800 DEG C or so, 50-200g/Nm of tail gas dust-laden3, and the Nature comparison of dust is special, and dust granules are thin, compare table Area is big, light specific gravity, while also having certain viscosity, it is difficult to deashing;Contain in dust in more coke dust, dust Ratio resistance is also higher.
Current calcium carbide stove exhaust purification and the technique utilized are mainly the work of waste heat boiler+bag-type dust (or electric precipitation) The technique of skill, the technique for forcing cooling+bag-type dust or conditioning Tower+electric precipitation.Can producing steam and hair with waste heat boiler technique Electricity, it is that the scope that can bear cigarette temperature drop to cloth bag is purified again to force cooling plus bag-type dust, conditioning Tower+electric precipitation work Skill is that dust specific resistance is dropped into the electricity consumption dust separation again of suitable scope.
The problem of purification technique of waste heat boiler+bag-type dust is present is due to the shadow of the dust of high content in calcium carbide tail gas Ring, cause boiler heating surface dust stratification to deteriorate heat-transfer effect, boiler efficiency drastically declines and exhaust temperature is difficult to be cooled to design temperature Degree, follow-up sack cleaner causes cloth bag to burn due to that can not bear high temperature, so this process operation effect is undesirable, surely Surely the difficulty run is very big.
It is that high-temperature tail gas is cooled by (usually direct-cooled) cold between cooling water or direct-cooled to force cooling plus bag-type dust The scope that can bear to cloth bag, then enter sack cleaner dedusting, this technology one is loss high-temperature tail gas waste heat, and two be desirable Substantial amounts of cooling water circulation sprinkling, water consumption power consumption is big and produces reluctant sewage, and economy and environment friendly be not good.
Electrostatic precipitation technology purifying calcium carbide furnace tail gas major problem is that the Nature comparison of contained dust is special in calcium carbide tail gas, The ratio resistance contained in dust in more coke dust, dust is also higher, even by damping or other technological adjustment Dust specific resistance, also still efficiency of dust collection is low and fluctuation is big, it is difficult to ensures system stable operation and meets purification requirement.
To sum up, existing calcium carbide stove exhaust treatment technology can not meet the purification of furnace of calcium carbide high-temperature tail gas and the energy, resource are returned The requirement of receipts, the energy, the level of resources utilization are low.
The content of the invention
It is an object of the invention to provide a kind of furnace of calcium carbide tail recycled for calcium carbide stove exhaust energy and resource high-efficiency Air drying dedusting-waste heat recovery-production synthesizes device of air.
The purpose of the present invention is achieved through the following technical solutions:
Calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesis the device of air of the present invention, including connected successively with pipeline Furnace of calcium carbide, high temperature calcium carbide tails dedusting system, calcium carbide tail gas composition reforming system, the high temperature calcium carbide waste heat from tail gas connect reclaims system System, low temperature calcium carbide tail-gas deep cleaning system, the low temperature calcium carbide tail-gas deep cleaning system are provided with gas fan.
As seen from the above technical solution provided by the invention, calcium carbide furnace tail gas dry process provided in an embodiment of the present invention is removed Dirt-waste heat recovery-production synthesis device of air, due to the furnace of calcium carbide including being connected successively with pipeline, high temperature calcium carbide tails dedusting System, calcium carbide tail gas composition reforming system, high temperature calcium carbide tail gas waste heat recovering system, low temperature calcium carbide tail-gas deep cleaning system, The low temperature calcium carbide tail-gas deep cleaning system is provided with gas fan, can first pass through high temperature calcium carbide tails dedusting system in high temperature The dust carried in lower removing calcium carbide stove exhaust, recycles calcium carbide stove exhaust high temperature in itself and sulfur-bearing to pass through calcium carbide tail gas composition Reforming system carries out sulphur-resistant conversion and CO Partial Transformations in tail gas is adjusted into C/Hratio in tail gas, then by more than high temperature calcium carbide tail gas Heat recovery system reclaims the waste heat production steam of high-temperature tail gas, while the steam of recovery waste heat production is used as the anti-of high-temperature dust removal again Blow and enter system as conversion steam, final purification mixed tail gas obtains that the pure conjunction of the Chemical Manufacture of carbon one requirement can be met Into gas, advanced technology is stable, realizes the maximization of the high temperature calcium carbide stove exhaust energy and resource reclaim benefit.
Brief description of the drawings
Fig. 1 is that calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production provided in an embodiment of the present invention synthesizes device of air Structural representation.
In figure:
The high temperature calcium carbide tails dedusting system of 1 furnace of calcium carbide 2
The high temperature calcium carbide tail gas waste heat recovering system of 3 calcium carbide tail gas composition reforming system 4
The gas fan of 5 low temperature calcium carbide tail-gas deep cleaning system 6
The cyclone separator of 201 high-temperature filter 202
The low temperature coal gas circulating fan of 301 calcium carbide tail gas shift-converter 302
The steam drum of 401 steam generator 402
403 steam superheaters
The back-blowing dust removing device of 2011 high temperature filtration component 2012
Embodiment
The embodiment of the present invention will be described in further detail below.
Calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesis the device of air of the present invention, it is preferably embodied Mode is as shown in Figure 1:
System is reformed including the furnace of calcium carbide 1 connected successively with pipeline, high temperature calcium carbide tails dedusting system 2, calcium carbide tail gas composition System 3, high temperature calcium carbide tail gas waste heat recovering system 4, low temperature calcium carbide tail-gas deep cleaning system 5, the low temperature calcium carbide tail-gas deep Cleaning system 5 is provided with gas fan 6.
Described furnace of calcium carbide 1 is closed calcium carbide furnace, there is one or many.
Described high temperature calcium carbide tails dedusting system 2 includes high-temperature filter 201, cyclone separator 202.
High temperature filtration component 2011 is set in described high-temperature filter 201, and the high temperature filtration component 2011 is porous Ceramic filter component or sintered porous metal filter assemblies, the high-temperature filter 201 are provided with back-blowing dust removing device 2012.
Described calcium carbide tail gas composition reforming system 3 includes calcium carbide tail gas shift-converter 301, the calcium carbide tail gas composition Reforming system 3 is additionally provided with low temperature coal gas circulating fan 302.
Described high temperature calcium carbide tail gas waste heat recovering system 4 includes steam generator 401, steam drum 402, steam superheating Device 403.
Described steam superheater 403 is arranged between the furnace of calcium carbide 1 and the calcium carbide stove exhaust hot precipitator 2.
High temperature calcium carbide stove exhaust is pooled to the calcium carbide stove exhaust hot precipitator 2 by described furnace of calcium carbide 1 by pipeline;
The operation temperature of the high temperature filtration component 2011 is between normal temperature --- between 900 DEG C;
It is clear that the control of back-blowing dust removing device 2012 carries out blowback using purge gas to the high temperature filtration component 2011 Ash, the purge gas is any one or more, the purge gas pressure among superheated steam, the CO gas of pressurization, nitrogen Between 0.2 --- 0.6MPa;
Using Co-Mo sulfur-tolerant shift catalyst to calcium carbide tail gas carry out portion in the calcium carbide tail gas shift-converter 301 Divide the mol ratio that transformationreation adjusts carbon monoxide and hydrogen in tail gas to 10~0.5;
Low temperature coal gas circulating fan 302 is used for the coal gas that will cool by the high temperature calcium carbide tail gas waste heat recovering system 4 It is partly recirculated in the calcium carbide tail gas shift-converter 301;
The steam generator 401 produces low by reclaiming the tail gas sensible heat after the calcium carbide tail gas composition reforming system 3 Saturated vapor is pressed, steam production closes the corresponding tail gas recycle waste heat by-product 0.6MPa saturated vapors 100 of calcium carbide yield per ton --- 150Kg, temperature of the mixed gas after the waste heat recovery processing of high temperature calcium carbide tail gas waste heat recovering system 4 is 20~50 ℃;
Described steam superheater 403 controls calcium carbide stove exhaust to enter the furnace of calcium carbide tail by vapor absorption tail gas heat quantity The temperature of gas hot precipitator 2 is at 250-450 DEG C.
Sulfur-bearing, phosphorus, arsenic, cyanogen, fluorine in the described removing mixed gas of low temperature calcium carbide tail-gas deep cleaning system 5 etc. are harmful Gas and CO2H in system after impurity, deep purifying2S < 0.03ppm, COS < 0.03ppm, CS2< 0.03ppm, PH3< 0.1ppm、AsH3< 0.1ppm, HF < 0.1ppm, HCN < 0.1ppm, HCl < 0.1ppm, metal carbonyl < 0.1ppm, O2< 500ppm。
Calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesis the device of air of the present invention, for calcium carbide stove exhaust energy Amount and resource high-efficiency are recycled, and the dust carried in calcium carbide stove exhaust can be removed at high temperature, recycle calcium carbide stove exhaust sheet The high temperature and sulfur-bearing of body carry out sulphur-resistant conversion and CO Partial Transformations in tail gas are adjusted into C/Hratio in tail gas, then reclaim high-temperature tail gas Waste heat production steam, while recovery waste heat production steam again as high-temperature dust removal blowback air enter system be used as conversion steam Vapour, final purification mixed tail gas obtains that the pure synthesis gas of the Chemical Manufacture of carbon one requirement can be met, advanced technology is stable, Realize the maximization of the high temperature calcium carbide stove exhaust energy and resource reclaim benefit.
In the present invention, the high temperature calcium carbide tails dedusting system is that front end undertakes rough dusting, rear end by cyclone separator The combined system of refined dedusting is undertaken by high-temperature filter, the high-temperature filter is separated filter space by high-temperature dust removal component Into dust-laden space and clean room, the high-temperature dust removal component can be porous ceramic film material or sintered porous metal material, The filtering accuracy of the high-temperature dust removal component is at 0.2 micron --- 5 microns, it is allowed to which running temperature is in normal temperature --- 900 DEG C.
Preferably, steam superheater, saturation are set before calcium carbide stove exhaust enters the high temperature calcium carbide tails dedusting system Steam source controls calcium carbide stove exhaust to enter the high temperature in residual neat recovering system described in rear end by vapor absorption tail gas heat quantity The temperature of calcium carbide tail gas dust pelletizing system is at 300-450 DEG C, while anti-required for providing the high temperature calcium carbide tails dedusting system Blowing-out ash gas, the effect of this some vapor also reside in simultaneously be the follow-up calcium carbide tail gas composition reforming system reaction vapor.
The calcium carbide tail gas composition reforming system mainly uses calcium carbide tail gas shift-converter by the high temperature Jing Guo dedusting Tail gas by Partial Transformation react regulation tail gas in carbon monoxide and hydrogen ratio with reach subsequent production artificial oil, methanol or The requirement of the chemical products such as person's ethylene glycol carbon monoxide/hydrogen ratio.Preferably, adjusted through the calcium carbide tail gas composition reforming system Carbon monoxide/hydrogen ratio (mol ratio) of whole rear tail gas is 10~0.5.
Preferably, calcium carbide tail gas shift-converter is divided to two sections or multistage filling Co-Mo sulfur-tolerant shift catalyst, intersegmental The coal gas cooled down by the follow-up high temperature calcium carbide tail gas waste heat recovering system is supplemented by low temperature coal gas circulating fan to circulate Quench coal gas come control transformationreation temperature and improve CO transformationreations conversion ratio.
The high temperature calcium carbide tail gas waste heat recovering system reclaims high temperature calcium carbide stove exhaust and the sensible heat of transformationreation, will mix Gas cools to normal temperature in favor of further deep purifying synthesis gas.Preferably, the high temperature calcium carbide tail gas waste heat recovering system Reclaiming the steam of waste heat from tail gas production is used for the carbon monodixe conversion steam of the calcium carbide tail gas composition reforming system.
The crude synthesis gas that the low temperature calcium carbide tail-gas deep cleaning system is produced front end system carry out deep purifying with The material purity requirement of the chemical products such as subsequent production artificial oil, methanol or ethylene glycol is reached, it is de- using industry as needed Sulphur agent, Dephosphorising agent, Hydrodearsenic Catalyst, defluorinating agent, de- HCN catalyst, antichlor, decarbonylation based metal catalysts and deoxidier removing are mixed H in system after the impurity such as pernicious gas and CO2 such as sulfur-bearing, phosphorus, arsenic, cyanogen, fluorine in conjunction gas, deep purifying2S < 0.03ppm, COS < 0.03ppm, CS2< 0.03ppm, PH3< 0.1ppm, AsH3< 0.1ppm, HF < 0.1ppm, HCN < 0.1ppm, HCl < 0.1ppm, metal carbonyl < 0.1ppm, O2< 500ppm.
Compared with the purification of existing calcium carbide tail gas and using technology, had using the present invention of above-mentioned technical proposal following excellent Point:
1. go out in calcium carbide stove exhaust under the condition of high temperature of furnace of calcium carbide, i.e., it is dust therein is cleared, follow-up equipment processing Calcium carbide stove exhaust no longer dust-laden, it is to avoid waste heat boiler dust stratification, equipment pipe abrasion, equipment pipe such as block at the hair of rough sledding It is raw;
2. the dedusting of this technology is high-temperature dry dedusting, exhaust temperature is not reduced after dedusting, components unchanged, is subsequent high temperature Waste heat from tail gas is reclaimed, CO gas reclaims and provides necessary condition;
3. this technology produces steam using calcium carbide stove exhaust itself waste heat, and the steam of by-product is immediately available for exhaust gas component Reform, realize the slitless connection that the conversion of calcium carbide stove exhaust energy and composition are reformed, the efficiency of energy utilization and matter utilization is most Height, to reduction calcium carbide energy consumption, the profitability for improving calcium carbide production is significant;
4. this technology realizes the recycling recovery to calcium carbide tail gas, the by-product CO gas of calcium carbide production can all reclaim conversion Into the high-quality synthesis gas produced available for chemical products such as artificial oil, methanol or ethylene glycol, the maximum of economy of resources is realized Change.
Specific embodiment 1:
200,000 tons/year of calcium carbide production lines of certain factory one are equipped with 2 48000KVA closed calcium carbide furnaces, and calcium carbide stove exhaust is normal Flow adds up to 11000Nm3/ h, normal 400~600 DEG C of temperature, exhaust gas component and Dust Characteristics are shown in Tables 1 and 2, table 3:
The calcium carbide stove exhaust composition of table 1. constitutes table
Title CO H2 CO2 N2 O2 Other Dust
Content (V%) 70~90 2~6 1~3 2~5 0.2~1 ~1 120g/Nm3
The calcium carbide stove exhaust of table 2. carries dust composition
Dust CaO C SiO2 Fe2O3 Al2O3 Other
Percentage (W%) 37.2 34.1 15.8 0.96 7.1 ~4.84
The calcium carbide stove exhaust of table 3. carries dust size distribution
Particle diameter μm 0~2 2~5 5~10 10~20 20~40 > 40
Percentage (W%) 37.9 19.2 20.8 17.1 3.9 1.1
As shown in Figure 1, go out the tail gas of the furnace of calcium carbide flow after flue collects and add up to 11000Nm3/ h enters steam mistake Hot device 403 is exchanged heat with the saturated vapor that high temperature calcium carbide tail gas waste heat recovering system 4 is brought, and the temperature of calcium carbide stove exhaust is lowered To 300 DEG C, while producing 0.5MPa, 250 DEG C of superheated steam.
The advanced rough dusting of cyclone separator 202 of calcium carbide tail gas come out from steam superheater 403, in cyclone separator 67% big particle diameter dust can be about removed in 202, remaining dust size concentrates on 0-5 μm, into high-temperature filter 201 Refined dedusting.The high temperature filtration component 2011 installed in high-temperature filter 201 is Co-based alloy powder sintered filter core, unsymmetrical knot Structure, the filtering precision of filter core in itself is 1 μm, during actual filtration, due to playing the mainly filter cake of filtering interception function Layer, so most dust for being less than 1 μm can also be removed, finally goes out the tail gas dust-laden < 20mg/m of high-temperature filter 2013
With the extension of filtration time, the dust thickness increase on high temperature filtration component 2011, the resistance of filtering are attached to Increase, when the resistance of high-temperature filter 201 increases to 3KPa, system automatically turns on the blowing function of back-blowing dust removing device 2012, Guiding 0.5MPa superheated steam reverse blow high temperature filtration component 2011 removes the cake layer accumulated above, recovers high temperature filtration The filter capacity of device 201.Meanwhile, the need for meeting calcium carbide tail gas composition reforming system 3 to steam, system is automatically controlled 3600Kg/h injection amount enters superheated steam to the blowback of high temperature filtration component 2011, and the effect of injection can also make high-temperature filter 201 run under relatively low pressure drop level.
By dedusting and the exhaust temperature for being mixed with steam at 280 DEG C or so, steam-to-gas ratio 0.51 enters exhaust gas component and reformed System 3 adjusts exhaust gas component.One section of progress CO shift reaction of the advanced calcium carbide tail gas shift-converter 301 of tail gas, electricity The one section outlet of stone tail gas shift-converter 301 is blended after the low temperature coal gas cooling brought from low temperature coal gas circulating fan 302 Enter the second-stage reaction of calcium carbide tail gas shift-converter 301, catalyst for water-gas shift reaction uses Co-Mo sulfur-tolerant shift catalyst, goes out tail The gas componant of gas composition reforming system 3 is CO/H2=1, remaining is CO2And impurity, 450 DEG C of temperature.
The gas come out from exhaust gas component reforming system 3 enters high temperature calcium carbide tail gas waste heat recovering system 4 and reclaims waste heat from tail gas 0.5MPa saturated vapor 5.5t/h are produced, some vapor devaporation superheater 403 is made outside blowback air and conversion steam, some vapor Send, while exhaust temperature, which is reduced to 50 DEG C, enters low temperature calcium carbide tail-gas deep cleaning system 5.
Mixed gas removes sulfur-bearing, phosphorus, arsenic, cyanogen, fluorine in mixed gas by low temperature calcium carbide tail-gas deep cleaning system 5 Deng impurity such as pernicious gas and CO2, H in system after deep purifying2S < 0.03ppm, COS < 0.03ppm, CS2< 0.03ppm, PH3< 0.1ppm, AsH3< 0.1ppm, HF < 0.1ppm, HCN < 0.1ppm, HCl < 0.1ppm, metal carbonyl < 0.1ppm、O2< 500ppm.
Finally give CO/H2=1 ︰ 1 (mol ratios) Clean synthesis gas 8800Nm3/ h, this synthesis gas makees LNG raw materials for production gas Produce ten thousand tons of LNG1.1 per year.
Specific embodiment 2:
What 200,000 tons/year of calcium carbide production lines of certain factory one were equipped with is the complete set of equipments of heat accumulating type calcium carbide production, and this device exists Raw material of calcium carbide furnace pretreatment stage by-product H2≈8700Nm3/ h, supporting then similar to embodiment 1, the calcium carbide tail of closed calcium carbide furnace The yield and constitutive property of gas are also similar to embodiment 1, and this example reclaims CO gas using calcium carbide stove exhaust and matched with by-product hydrogen Carry out ten thousand tons/year of LNG2.2 of methanation reaction production.
This production decision is similar to Example 1, the difference is that this example is not set after high temperature calcium carbide tails dedusting system Calcium carbide tail gas composition reforming system 3, all effective CO gases are through high temperature calcium carbide tail gas waste heat recovering system 4 and low temperature calcium carbide Tail-gas deep cleaning system 5 is reclaimed completely, this device recovery waste heat by-product 0.5MPa saturated vapor about 3t/h, reclaims clean effective CO gas ≈ 8800Nm3/h。
The CO gas that this device is reclaimed and the H in raw material of calcium carbide furnace pretreatment stage by-product2Coordinate production LNG, produce LNG per year about 2.2 ten thousand tons.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in, It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims Enclose and be defined.

Claims (1)

1. a kind of calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesizes device of air, it is characterised in that including using successively Furnace of calcium carbide (1), high temperature calcium carbide tails dedusting system (2), calcium carbide tail gas composition reforming system (3), the high temperature calcium carbide of pipeline connection Tail gas waste heat recovering system (4), low temperature calcium carbide tail-gas deep cleaning system (5), the low temperature calcium carbide tail-gas deep cleaning system (5) it is provided with gas fan (6);
Described furnace of calcium carbide (1) is closed calcium carbide furnace, there is one or many;
Described high temperature calcium carbide tails dedusting system (2) includes high-temperature filter (201), cyclone separator (202);
Described calcium carbide tail gas composition reforming system (3) includes calcium carbide tail gas shift-converter (301), the calcium carbide tail gas composition Reforming system (3) is additionally provided with low temperature coal gas circulating fan (302);
Described high temperature calcium carbide tail gas waste heat recovering system (4) includes steam generator (401), steam drum (402), steam mistake Hot device (403);
High temperature filtration component (2011) is set in described high-temperature filter (201), and the high temperature filtration component (2011) is many Hole ceramic filter component or sintered porous metal filter assemblies, the high-temperature filter (201) are provided with back-blowing dust removing device (2012);
Described steam superheater (403) be arranged on the furnace of calcium carbide (1) and the high temperature calcium carbide tails dedusting system (2) it Between;
High temperature calcium carbide stove exhaust is pooled to the high temperature calcium carbide tails dedusting system (2) by described furnace of calcium carbide (1) by pipeline;
The operation temperature of the high temperature filtration component (2011) is between normal temperature --- between 900 DEG C;
It is clear that back-blowing dust removing device (2012) control carries out blowback using purge gas to the high temperature filtration component (2011) Ash, the purge gas is any one or more, the purge gas pressure among superheated steam, the CO gas of pressurization, nitrogen Between 0.2 --- 0.6MPa;
It is anti-to calcium carbide tail gas progress Partial Transformation using sulfur-resistant transformation catalyst in the calcium carbide tail gas shift-converter (301) The mol ratio of carbon monoxide and hydrogen in tail gas should be adjusted to 10~0.5;
Low temperature coal gas circulating fan (302) is used for the coal gas that will cool by the high temperature calcium carbide tail gas waste heat recovering system (4) It is partly recirculated in the calcium carbide tail gas shift-converter (301);
The steam generator (401) produces low by reclaiming the tail gas sensible heat after the calcium carbide tail gas composition reforming system (3) Saturated vapor is pressed, steam production closes the corresponding tail gas recycle waste heat by-product 0.6MPa saturated vapors 100 of calcium carbide yield per ton --- 150Kg, temperature of the mixed gas after high temperature calcium carbide tail gas waste heat recovering system (4) waste heat recovery processing is 20~50 ℃;
Described steam superheater (403) controls calcium carbide stove exhaust to enter the high temperature calcium carbide tail by vapor absorption tail gas heat quantity The temperature of gas dust pelletizing system (2) is at 250-450 DEG C;
Contain pernicious gas and CO in described low temperature calcium carbide tail-gas deep cleaning system (5) removing mixed gas2Impurity, it is deep H in system after degree purification2S < 0.03ppm, COS < 0.03ppm, CS2< 0.03ppm, PH3< 0.1ppm, AsH3< 0.1ppm, HF < 0.1ppm, HCN < 0.1ppm, HCl < 0.1ppm, metal carbonyl < 0.1ppm, O2< 500ppm, the pernicious gas bag Include sulphur, phosphorus, arsenic, cyanogen, fluorine.
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CN108180763B (en) * 2018-01-11 2019-05-24 重庆岩昱节能科技有限公司 A kind of calcium carbide device for recycling heat and application method
CN109160563B (en) * 2018-09-06 2021-05-18 国家海洋局天津海水淡化与综合利用研究所 Seawater desalination system based on water vapor capture and waste heat recovery in power plant flue gas
CN109647119A (en) * 2018-12-06 2019-04-19 安徽华塑股份有限公司 It is a kind of for improving the production technology of calcium carbide stove exhaust comprehensive utilization ratio
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