CN105170052A - Method and system for treating cracking flue gas of acetylene furnace - Google Patents
Method and system for treating cracking flue gas of acetylene furnace Download PDFInfo
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- CN105170052A CN105170052A CN201510635458.9A CN201510635458A CN105170052A CN 105170052 A CN105170052 A CN 105170052A CN 201510635458 A CN201510635458 A CN 201510635458A CN 105170052 A CN105170052 A CN 105170052A
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Abstract
The invention discloses a method and a system for treating cracking flue gas of an acetylene furnace. According to the method, the cracking flue gas of the acetylene furnace is cooled indirectly through liquid metal to 220 DEG C and then subjected to dust separation through a dust collector, gas subjected to dust separation through the dust collector is cooled to 80 DEG C through a quench tower, and the liquid metal finishing cooling of cracking flue gas is used for heating softened water of a boiler. According to the method, coke gathering on the inner wall of a reactor of an acetylene cracking furnace can be prevented effectively, waste heat of the cracking flue gas can be recovered effectively, the present situation that an enterprise for producing acetylene from natural gas never recycles the waste heat of the cracking flue gas is changed, the production technology for recovering solid waste such as powdery carbon black, lump coke and the like with a wet process is eliminated, the present situation of direct landfill or incineration is changed, the powdery carbon black is recovered with a dry process, pollution of wastewater to the surrounding environment is reduced, and good social environmental protection benefits and economic values are realized.
Description
Technical field
The present invention relates to processing method and the system of partial oxidation reactor cracking flue gas in gas by partial oxidation of natural acetylene, belong to industrial exhaust heat and solid waste recycling technical field.
Background technology
In gas by partial oxidation of natural acetylene production, natural gas generates the cracking flue gas containing acetylene through partial oxidation reaction, and this cracking flue-gas temperature is up to 1000-1500 DEG C, and wherein powdery content of carbon black is 3g/m
3.Existing production technology directly cools cracking flue gas with three ring water, as shown in Figure 1, natural gas enters at high temperature cracking in the reactor 1-1 on acetylene pyrolysis furnace 1 top and forms cracking flue gas containing acetylene, and then this cracking flue gas directly cools to go out pyrolysis furnace after to 78 ~ 80 DEG C and enter scrubbing tower 2 and carry out subsequent handling through the cooling water that acetylene pyrolysis furnace 1 bottom sprays into.The object of cracking flue gas of directly cooling in prior art is: one is stop cracking reaction; Two is the powdery carbon blacks in cooling removing cracking flue gas, meets the demand of the production technology such as subsequent wash, electric precipitation.Therefore, in acetylene production, just create a large amount of carbon black sewage, meanwhile, the technique that directly cools also causes physics heat energy in cracking flue gas to recycle.
First, owing to containing powdery carbon black in cracking flue gas, in the process directly cooled through three ring Water spray, powdery carbon black is just washed and is separated from cracking flue gas, thus defines a large amount of carbon black waste waters containing carbon black.If this carbon black waste water is not processed directly discharge, environmental pollution is very big.At present, the large-scale state-owned enterprise of the domestic employing gas by partial oxidation of natural acetylene such as Sinopec Sichuan vinylon company, Salt Lake Industry, Qinghai company, be equipped with carbon black waste water treating apparatus, through this device to process such as the separation of carbon black waste water, sedimentation, concentrated, vacuum dehydrations, carbon black waste water after removing impurities can do recirculated water and use, carbon black waste water finally by vacuum dehydration process, year the carbon black mud of recyclable about 100,000 ton moisture 85 ± 5%.Because carbon black mud water content is high, and it is complicated containing organic matter, as organic polymers such as diacetylene, vinylacetylene, unsaturated hydrocarbon, aromatic hydrocarbons, at present, these enterprises domestic further do not deepen processing recycling measure to carbon black mud, are all regarded as solid waste, take the method for garbage loading embeading or burning to dispose, so both cause the underground water pollution of landfill surrounding enviroment, waste a large amount of renewable resources.
Next is block coke, wall of reactor due to existing acetylene pyrolysis furnace top all adopts metal material (such as iron plate) to be made, in order to ensure that the temperature of reactor wall temperature and internal cleavage flue gas is consistent, as shown in Figure 3, the working environment that water leg 1-11 carrys out guard reactor is provided with outside iron plate 1-12, due to the reason of water leg protection steel plate, surface of steel plate temperature is lower, about about 100 degree, under this operating mode, the organic polymers such as unsaturated aromatic hydrocarbon just easily produce phase transformation and adhesion and aggregation at surface of steel plate, so just cause the organic polymers such as the unsaturated aromatic hydrocarbon in cracking flue gas, the easily carbonization coking in reactor wall gathering dehydrogenation under high temperature and the insufficient condition of oxygen, reactor wall is periodically aggregated just defines block coke.Process for block coke is very thorny in acetylene production process, normal production will be cleared up once with manipulator for 2-3 hour, due to block coke not easy to clean, and accumulated plugging gradually, apparatus for producing ethyne is approximately quarterly had to stop production and is cleared up, and every annual periodicity start-stop car causes larger economic loss to acetylene production enterprise.
Summary of the invention
Object of the present invention is just the deficiency proposed for above-mentioned prior art, a kind of method and system of process acetylene cracking flue gas is newly provided, it effectively can prevent the gathering of coke on existing acetylene pyrolysis furnace reactor wall, effective recovery cracking fume afterheat, change current natural gas acetylene enterprise never to the present situation of cracking flue gas heat recovery, eliminate the production technology of the solid waste such as hydrometallurgic recovery powdery carbon black and block coke, change the present situation taking direct landfill or burning, Dry recovery powdery carbon black, reduce waste water to pollute surrounding enviroment, there is good social enviroment protection benefit and economic worth.
To achieve these goals, the invention provides a kind of method processing partial oxidation reactor cracking flue gas, it be after partial oxidation reactor cracking flue gas liquid metal is cooled to 220 DEG C indirectly with dust-precipitator to its dust separation, and then the gas after dust-precipitator dust separation is cooled to 80 DEG C by quench tower; Liquid metal after cooling cracking flue gas is used for heating boiler demineralized water; Described indirect cooling adopts heat exchanger cooling, and cracking flue gas walks heat exchanger tube pass, and liquid metal walks heat exchanger shell pass; Temperature before described liquid metal cooling cracking flue gas is 120 DEG C; The physical and chemical index of described liquid metal is: fusing point 8 DEG C, density 6363kg/m3, boiling point 2000 DEG C, thermal conductivity 30-50w/m2.k, specific heat 0.4kJ/kg. DEG C.
Wherein, be: first, Quick stop cracking reaction with liquid metal by cracking flue gas cool-down to the reason of 220 DEG C, the temperature range stopping cracking reaction is 450-550 DEG C; Secondly, consider that cracking flue gas organic polymer is complicated, after temperature is too low, may phase transformation be produced; 3rd, take into account follow-up dust-precipitator dust separation optimum working temperature, current domestic membrane bag filter maximum operating temperature is 300 DEG C, and optimum working temperature interval is 200-260 DEG C.
Further, adopt liquid metal as heat transferring medium, one is boiling point 2000 DEG C, and in this high temperature, medium does not gasify, and medium is very micro-to tube wall pressure, not easily leaks; Two is liquid metals is the blending ingredients of Multimetal oxide, non-corrosiveness; Three is thermal conductivity 30-50w/m
2.k, than the thermal conductivity coefficient 0.5w/m of water
2.k nearly greatly 100 times, the time requirement that acetylene cracking reaction requires to stop cracking reaction in 3%0 seconds can be met, if be thermal medium with water, the very difficult time requirement reaching such Quick stop cracking reaction.
Simultaneously, present invention also offers a kind of system processing partial oxidation reactor cracking flue gas formulated according to said method, it comprises acetylene pyrolysis furnace, acetylene pyrolysis furnace top arranges reactor, its wall is nonmetallic composite wall, below reactor, in acetylene pyrolysis furnace, heat exchanger is set, reactor exhanst gas outlet connects heat exchanger tube pass import, heat exchanger shell pass import connects electromagnetic pump, electromagnetic pump is connected with waste heat boiler liquid metal outlet, waste heat boiler refluxing opening connects heat exchanger shell pass outlet, bottom waste heat boiler, water inlet is set, water inlet connects softening water pump, liquid metal heat exchanger tube is set in waste heat boiler, acetylene pyrolysis furnace exhanst gas outlet connects dust-precipitator, and dust-precipitator gas vent connects quench tower, described dust-precipitator dust mouth connects airtight valve, and airtight valve connects auger conveyor.
Preferably, above-mentioned auger conveyor is water leg auger conveyor.Because be about 200 DEG C through dust-precipitator isolated powdery carbon black temperature, can cool to 70 DEG C through water leg auger conveyor, allow powdery carbon black far below its ignition temperature, be convenient to storage package.
Further, above-mentioned dust-precipitator adopts the impulse bag type dust collector of polyfluortetraethylefilm film coated filter bag.
Above-mentioned nonmetallic composite wall comprises pink fused alumina plate, refractory material pour and hollow ball pour from the inside to the outside successively; Pink fused alumina plate is built by laying bricks or stones by chrome corundum brick and is formed, and refractory material pour forms by building based on the high-temperature refractory of aluminium oxide, chromium oxide, and hollow ball pour is built by alumina hollow ball and formed.
Above-mentioned heat exchanger is tubular heat exchanger.
Compared with prior art, first cracking flue gas directly changes into by water cooling and indirectly cooling with liquid metal by the inventive method, the mode of liquid metal heat exchanger is adopted to cool partial oxidation reactor cracking flue gas, can by the cracking flue gas fast cooling of 1000-1500 in tube side DEG C to 220 DEG C, stop cracking reaction, the heat exchange mode that the present invention adopts is indirect heat exchange mode, through being warmed up to 550 DEG C with the liquid metal temperature of flue gas heat exchange from 120 DEG C, can be used to carry out heat exchange with demineralized water, produce high steam, realize UTILIZATION OF VESIDUAL HEAT IN, liquid metal under simultaneously cooling is capable of circulation for cooling cracking flue gas,
Secondly; the wall of reactor material of the acetylene pyrolysis furnace that present system provides adopts nonmetallic composite; instead of the metal material that pre-existing reactors uses; thus the protection of water leg is eliminated; nonmetallic composite main component of the present invention is based on the high-temperature refractory of aluminium oxide, chromium oxide; its normal refractory temperature is 1500-1900 DEG C; higher than the cracking environment temperature of partial oxidation reactor; be equipped with hollow ball Lightweight aluminum oxide castable to be incubated; so, the working environment of water leg guard reactor need not be used completely.Reactor provided by the invention ensure that the temperature of reactor wall temperature and internal cleavage flue gas is consistent, to avoid in cracking flue gas the organic polymers such as unsaturated aromatic hydrocarbon produce phase transformation at reactor wall and assemble, thus ultimately improve the operating mode that organic polymer assembles dehydrogenation and carbonization coking under high temperature.
Accompanying drawing explanation
Fig. 1 is existing acetylene cracking technology schematic flow sheet;
(A:1000 ~ 1500 DEG C; B:80 DEG C; C: recirculated water)
Fig. 2 is the structural representation of the system of process partial oxidation reactor cracking flue gas of the present invention;
（a：1000～1500℃；b：120℃；c：550～580℃；d：200～220℃；e：180℃；f：80℃；g：25℃）
Fig. 3 is the part-structure schematic diagram of pre-existing reactors;
Fig. 4 is the part-structure schematic diagram of reactor of the present invention;
Fig. 5 is the structural representation of heat exchanger of the present invention.
Marginal data:
1, acetylene pyrolysis furnace; 2, scrubbing tower; 3, electromagnetic pump; 4, waste heat boiler; 5, softening water pump; 6, dust-precipitator; 7, airtight valve; 8; Water leg auger conveyor; 9, storage bin; 10, quench tower; 11, cracking flue gas; 12, liquid metal;
1-1: reactor; 1-11: water leg; 1-12: iron plate; 1-13: pink fused alumina plate; 1-14: refractory material pour; 1-15: hollow ball pour;
1-2: heat exchanger; 1-21: tube side import; 1-22: shell side import; 1-23: shell-side outlet.
Detailed description of the invention
In order to the object of the present invention of understanding clearly, technical scheme and beneficial effect, below the present invention is described further, but not by protection scope of the present invention limit in the examples below.
See Fig. 2, Fig. 4 and Fig. 5, a kind of system processing partial oxidation reactor cracking flue gas provided by the invention, it comprises acetylene pyrolysis furnace 1, acetylene pyrolysis furnace top arranges reactor 1-1, its wall is nonmetallic composite wall, and its nonmetallic composite wall comprises pink fused alumina plate 1-13, refractory material pour 1-14 and hollow ball pour 1-15 from the inside to the outside successively; Below reactor, in acetylene pyrolysis furnace, heat exchanger 1-2 is set, reactor exhanst gas outlet connects heat exchanger tube pass import 1-21, heat exchanger shell pass import 1-22 connects electromagnetic pump 3, electromagnetic pump 3 is connected with waste heat boiler 4 liquid metal outlet, waste heat boiler 4 refluxing opening connects heat exchanger shell pass outlet 1-23, arrange water inlet bottom waste heat boiler, water inlet connects softening water pump 5, arranges liquid metal heat exchanger tube in waste heat boiler; Acetylene pyrolysis furnace exhanst gas outlet connects dust-precipitator 6, and dust-precipitator 6 gas vent connects quench tower 10; The dust mouth of described dust-precipitator 6 connects airtight valve 7, and airtight valve 7 connects water leg auger conveyor 8, and isolated for dust-precipitator powdery carbon black cools and sends into storage bins 9 to 70 DEG C and store preservation by water leg auger conveyor 8.
See Fig. 2, during work, natural gas enters at high temperature cracking in the reactor 1-1 on acetylene pyrolysis furnace 1 top and forms the cracking flue gas containing acetylene, then the liquid metal 12 of this cracking flue gas 11 tube side and shell fluid flow of entering heat exchanger 1-2 carries out heat exchange, in tube side, the cracking flue gas fast cooling of 1000-1500 DEG C is to 220 DEG C, stops cracking reaction; Liquid metal in shell side is warmed up to 550 DEG C by 120 DEG C, be delivered in waste heat boiler 4 through shell-side outlet 1-23 and carry out heat exchange with the demineralized water in waste heat boiler, produce high steam, reach the object reclaiming cracking flue gas physics heat energy, liquid metal under simultaneously cooling through electromagnetic pump 3 enter again in heat exchanger 1-2 with cracking flue gas 11 heat exchange, realize recycling of liquid metal.The cracking flue gas being cooled to 220 DEG C goes out heat exchanger and pyrolysis furnace, enters to send into original device equipment for washing tower again after quench tower 10 recirculated cooling water continues to be cooled to 80 DEG C and carry out subsequent reactions after entering dust-precipitator 6 dust separation.After cracking flue gas is separated by dust-precipitator 6, the powdery carbon black of about 200 DEG C is delivered to water leg auger conveyor 8 through airtight valve 7 and is carried out cooling to 70 DEG C, allows powdery carbon black far below its ignition temperature, is convenient to storage package.Dust-precipitator 6 preferred pulse bag hose, its operating temperature is less than 300 DEG C, adopts polyfluortetraethylefilm film coated glass fiber filter to filter, by the 3g/m in cracking flue gas
3powdery carbon black carries out dry method separation, its efficiency of dust collection can reach 99.99%, after gas-particle separation, flue gas sends into quench tower continuation cooling, be separated the solids such as powdery carbon black and be delivered to chuck auger by airtight valve, the high-pressure air source of electromagnetic impulse valve adopts 0.3Mpa Boiler Steam, and Main Function is the new component not increasing cracking flue gas.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred embodiment should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. one kind processes the method for partial oxidation reactor cracking flue gas, it is characterized in that: after partial oxidation reactor cracking flue gas liquid metal is cooled to 220 DEG C indirectly with dust-precipitator to its dust separation, and then the gas after dust-precipitator dust separation is cooled to 80 DEG C by quench tower; Liquid metal after cooling cracking flue gas is used for heating boiler demineralized water.
2. a kind of method processing partial oxidation reactor cracking flue gas according to claim 1, is characterized in that: described indirect cooling adopts heat exchanger cooling, and cracking flue gas walks heat exchanger tube pass, and liquid metal walks heat exchanger shell pass.
3. a kind of method processing partial oxidation reactor cracking flue gas according to claim 1 and 2, is characterized in that: the temperature before described liquid metal cooling cracking flue gas is 120 DEG C.
4. a kind of method processing partial oxidation reactor cracking flue gas according to claim 1, is characterized in that: the physical and chemical index of described liquid metal is: fusing point 8 DEG C, density 6363kg/m3, boiling point 2000 DEG C, thermal conductivity 30-50w/m2.k, specific heat 0.4kJ/kg. DEG C.
5. a kind of system processing partial oxidation reactor cracking flue gas of method formulation according to claim 2, comprise acetylene pyrolysis furnace, it is characterized in that: described acetylene pyrolysis furnace top arranges reactor, wall of reactor is nonmetallic composite, in acetylene pyrolysis furnace, below reactor, heat exchanger is set, reactor exhanst gas outlet connects heat exchanger tube pass import, heat exchanger shell pass import connects electromagnetic pump, electromagnetic pump is connected with waste heat boiler liquid metal outlet, waste heat boiler refluxing opening connects heat exchanger shell pass outlet, bottom waste heat boiler, water inlet is set, water inlet connects softening water pump, liquid metal heat exchanger tube is set in waste heat boiler, acetylene pyrolysis furnace exhanst gas outlet connects dust-precipitator, and dust-precipitator gas vent connects quench tower.
6. a kind of system processing partial oxidation reactor cracking flue gas according to claim 5, is characterized in that: described dust-precipitator dust mouth connects airtight valve, and airtight valve connects auger conveyor.
7. a kind of system processing partial oxidation reactor cracking flue gas according to claim 6, is characterized in that: described auger conveyor is water leg auger conveyor.
8. a kind of system processing partial oxidation reactor cracking flue gas according to any one of claim 5-7, is characterized in that: described dust-precipitator is the impulse bag type dust collector adopting polyfluortetraethylefilm film coated filter bag.
9. a kind of system processing partial oxidation reactor cracking flue gas according to claim 5, is characterized in that: described nonmetallic composite wall comprises pink fused alumina plate, refractory material pour and hollow ball pour from the inside to the outside successively.
10. a kind of system processing partial oxidation reactor cracking flue gas according to claim 5, is characterized in that: described heat exchanger is tubular heat exchanger.
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Cited By (4)
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| CN107219251A (en) * | 2017-06-28 | 2017-09-29 | 西安交通大学 | A kind of device and method for being used to test smoke gas afterheat heat exchanger dust stratification characteristic |
| CN108007223A (en) * | 2018-01-12 | 2018-05-08 | 重庆岩昱节能科技有限公司 | Crawler type calcium carbide waste-heat recovery device and recovery method |
| CN108087850A (en) * | 2018-01-12 | 2018-05-29 | 重庆岩昱节能科技有限公司 | A kind of pyrolysis furnace residual neat recovering system |
| CN114213877A (en) * | 2021-12-21 | 2022-03-22 | 焦作市和兴化学工业有限公司 | Acetylene black production system, acetylene black and preparation method thereof |
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| CN114213877A (en) * | 2021-12-21 | 2022-03-22 | 焦作市和兴化学工业有限公司 | Acetylene black production system, acetylene black and preparation method thereof |
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