CN102925195A - Ethylene cracking furnace combustion system taking water-coal-slurry as fuel - Google Patents
Ethylene cracking furnace combustion system taking water-coal-slurry as fuel Download PDFInfo
- Publication number
- CN102925195A CN102925195A CN201210387479XA CN201210387479A CN102925195A CN 102925195 A CN102925195 A CN 102925195A CN 201210387479X A CN201210387479X A CN 201210387479XA CN 201210387479 A CN201210387479 A CN 201210387479A CN 102925195 A CN102925195 A CN 102925195A
- Authority
- CN
- China
- Prior art keywords
- furnace
- slag
- coal
- water
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to a water-coal-slurry alternative technology, aiming to provide an ethylene cracking furnace combustion system taking water-coal-slurry as fuel. The system has the technical scheme that slap tapping vertical cyclone furnaces are used as extended furnaces of an ethylene cracking furnace; each slap tapping vertical cyclone furnace is provided with a columnar furnace body, the top of the furnace body is provided with a combustor, and the combustor is provided with a methane hydrogen burner nozzle and a water-coal-slurry atomizing nozzle; primary air outlets are arranged at the combustors, tangential secondary air nozzles are arranged at the upper parts of the furnace chambers, and tangential combustion secondary air nozzles are arranged at the lower parts of the furnace chambers; horizontal transition gas ducts are arranged between the bottoms of the furnace chambers and the bottom of an ethylene cracking furnace radiation section, and vertical slag capture pipe bundles are arranged at the inlets of the horizontal transition gas ducts in a staggered way; the bottom of each slap tapping vertical cyclone furnace is provided with a slag fence, and a slag well is arranged under the slag fence. According to the ethylene cracking furnace combustion system taking the water-coal-slurry as the fuel, disclosed by the invention, the water-coal-slurry is used for replacing methane hydrogen, so that the utilization efficiency and the value of the methane hydrogen are greatly enhanced; the slag capture efficiency of the vertical cyclone furnaces is improved to over 90%, and liquid ashes can be comprehensively utilized, therefore the application value and the economic benefit are wide.
Description
Technical field
The present invention relates to the alternative methane hydrogen of coal water slurry is the alternative techniques of fuel, relates in particular to a kind of firing system of the ethane cracking furnace take coal water slurry as fuel.
Background technology
The coal resource of China is abundant, but the oil and natural gas scarcity of resources,, thereby develops a kind of technology take coal as the replacement of fuel oil and natural gas and has great strategic importance long-term existence take coal as main energy structure; From utilization of resources angle, with coal through complicated technological process become oil product, again with oil product as fuel, not as utilizing new technology, novel process that coal is directly more direct, efficient as the technical process of industrial fuel.
Coal water slurry is a kind of coal-based liquid fuel, generally refers to the mixture that is comprised of 65% ~ 70% coal dust, 30% ~ 35% water and a small amount of chemical additive.It is the oil replacement technology of replace oil with coal, has both kept the original physics-chem characteristic of coal, have again with petroleum-type like mobile, stability and atomization characteristics, and technological process is simple, less investment, the products of combustion less pollution has very strong practicality and business promotion and is worth.The feed coal of preparation coal water slurry is through washing, and ash content and sulphur content all greatly reduce, the flying dust and the SO that produce after the burning
2All the coal firing boiler than general is low.Because the moisture in the coal water slurry also has reductive action when burning, theoretical combustion temperature also hangs down about 100 ℃ than the coal dust firing of identical ature of coal, therefore can reduce to a certain extent NO simultaneously
xQuantity discharged.
What the fuel of Furnace of Ethylene Cracking Plant generally used now is self-produced methane hydrogen (its chemical ingredients is similar to Sweet natural gas), if can develop the technology of using coal water slurry to do pyrolyzer fuel, can substitute out a large amount of methane hydrogen for the production of the higher product of added value (as: as the device for producing hydrogen raw material).Therefore, develop a kind of with coal water slurry directly as pyrolyzer fuel substituting the new technology of methane hydrogen, forward-looking, strategic importance and long-range economic implications.
Owing to do not use coal water slurry to do the precedent of fuel at pyrolyzer, and the characteristics such as the combustioncharacteristics of coal water slurry, knot ash and existing fuel (methane hydrogen) difference are very big, therefore need to be in conjunction with theory, technology and the experience of coal water slurry research aspect, and the production technology of pyrolyzer and experience, develop a kind of technology that required high-temperature flue gas can be provided as ethane cracking furnace take coal water slurry as fuel.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, and a kind of ethane cracking furnace firing system take coal water slurry as fuel with good prospects for commercial application is provided.
Be the technical solution problem, solution of the present invention is:
A kind of ethane cracking furnace firing system take coal water slurry as fuel is provided, has comprised ethane cracking furnace; This firing system is with the extended furnace of slag tap vertical cyclone furnace as ethane cracking furnace; Described slag tap vertical cyclone furnace has the body of heater of column, and burner is established at its top, and burner has methane hydrogen burning mouth and water-coal-slurry atomizing nozzle; Establish a wind outlet at the burner place, arrange tangential overfire air port in upper furnace, arrange tangential burning overfire air port in lower furnace portion; Between burner hearth bottom and ethane cracking furnace radiation section bottom the horizontal transition flue is set, the ingress of horizontal transition flue is staggered in arrangement vertical slag collecting bunch; Establish the slag hurdle in the bottom, the below on slag hurdle is provided with the slag well.
Among the present invention, the body of heater of described slag tap vertical cyclone furnace is film water cold wall structure: adiabator layer is established in the outside, the centre is water wall tube, and the inner surface of water wall tube gathers, and slag is followed closely and follow closely the surperficial carborundum coating layer that coating is set at inner surface and slag; The furnace bottom place establishes the cooling water inlet that connects water wall tube, and upper of furnace body is established vapour outlet, and vapour outlet is connected to water wall tube through drum.
Among the present invention, between the body of heater of the burner of described slag tap vertical cyclone furnace and film water cold wall structure, also be provided with an adiabatic stable burning room, its furnace wall is the adiabatic wall of laying fireproof bricks.
Among the present invention, described tangential overfire air port and burning overfire air port respectively have four, and every kind of spout is divided into two-layer layout.
Among the present invention, the bottom of described horizontal transition flue is the inclined-plane that is 5 ° of angles with horizontal direction, and its end that is connected to ethane cracking furnace radiation section bottom is a higher end; The horizontal transition flue has the two-part structure: the main part that connects burner hearth bottom is film water cold wall structure, its outside establishes adiabator layer, middle is water wall tube, gather slag nail and the carborundum coating layer of coating is set on inner surface and slag nail surface of the inner surface of water wall tube; The part that connects ethane cracking furnace radiation section bottom is water-cooling jacket.
Among the present invention, the outside encirclement of each pipe fitting of described slag collecting bunch arranges water-cooling jacket, and the carborundum refractory layer of coating is established in the outside of water-cooling jacket.
Among the present invention, described slag tap vertical cyclone furnace has 6, is located at respectively the both sides of ethane cracking furnace, each one of per two groups of heating surface left and right sides.
Among the present invention, this system also comprises:
By unloading pump, water coal slurry tank, pump for mortar transmission, stokehold stirred pot, slurry supply pump, pot strainer that pipeline connects successively, pot strainer is connected to the burner at body of heater top through magnetic flow meter;
Be connected in the coal water slurry steam atomizing system of body of heater top burner by pipeline;
By gas blower butterfly valve, the differential pressure pickup that pipeline connects successively, differential pressure pickup is connected to the burner and each spout of being located in the burner hearth at body of heater top by the road;
By SCR denitrification apparatus, sack cleaner, circulating fluid bed semi-drying method desulfurizer, induced draft fan and chimney that pipeline connects successively, the SCR denitrification apparatus is connected to the exhanst gas outlet of ethane cracking furnace;
Be located at the scraper type slag extractor of slag downhole, scraper type slag extractor is connected to the granulation case.
Based on the use of firing system described in the present invention, form a kind of ethane cracking furnace combustion method take coal water slurry as fuel, be with the extended furnace of slag tap vertical cyclone furnace as ethane cracking furnace; Specifically comprise: use the igniting that acts as a fuel of methane hydrogen, after the fire box temperature of slag tap vertical cyclone furnace reaches cool water mixture burning and requires, make and spray into burner hearth through the coal water slurry of steam atomizing by the coal-water slurry nozzle of burner and burn, under the strong swirling eddy effect of coal slurry particle in burner hearth, adherent burning occurs and form the liquid slag film of protecting furnace wall refractory; High-temperature flue gas leaves burner hearth and is entered by ethane cracking furnace radiation section bottom by the horizontal transition flue, for the cracking of ethylene of the reaction tubes that is arranged in ethane cracking furnace radiation section heating surface provides required high-temperature flue gas; High-temperature flue gas enters sack cleaner through the SCR denitrification apparatus after leaving ethane cracking furnace, and sends into desulfurizer by induced draft fan, finally by entering atmosphere by chimney; The scraper slagging machine that is arranged in slag tap vertical cyclone furnace bottom is connected with the slag well, is responsible for cooling off and the slag of granulation is constantly discharged by the granulation case.
Compared with prior art, the invention has the beneficial effects as follows:
1, traditional ethane cracking furnace technique acts as a fuel with methane hydrogen, and main source is Sweet natural gas, and the price of Sweet natural gas is progressively ascendant trend at present, in view of present international Gas Prices has reached 4.0 yuan/Nm
3And the impact of the energy dilemma that the gradually minimizing of considering oil, natural gas reserves causes, domestic Sweet natural gas also will certainly be in line with international standards, is high gradually trend; therefore, ethane cracking furnace fuel transform combusting coal water slurry as and has in the long term good economic outlook and profit space.
2, traditional ethane cracking furnace technique acts as a fuel with methane hydrogen, thereby causes a large amount of methane hydrogen to lose for the production of the higher Chemicals of added value, is that fuel can address this problem with coal water slurry, has greatly improved utilising efficiency and the value of methane hydrogen.
3, at present traditional slag tap cyclone furnace all coal dust act as a fuel, both kept the original physics-chem characteristic of coal and act as a fuel with coal water slurry, have again with petroleum-type like mobile, stability and atomization characteristics, and technological process is simple, less investment, the products of combustion less pollution has very strong practicality and business promotion and is worth.In conjunction with the characteristics of slag tap cyclone furnace, the vertical cyclone furnace retention efficiency can be brought up to more than 90%, especially be fit to the environment of the low grey clean flue gas of needs high temperature such as petrochemical industry.
4, the slag tap cyclone furnace can utilize deslagging to make cement by mixing the scoria lime stone, can also utilize liquid slag directly to pour into a mould cast stone according to the chemical ingredients of lime-ash, and liquid lime-ash can also fully utilize.The coal water slurry liquid slag forms through over-quenching, equally can brickmaking, the making cement batching, or the higher wear-resisting masonry of economic worth.Therefore, be with a wide range of applications and economic benefit.
5, the present invention is directed to slag tap vertical cyclone furnace take coal water slurry as fuel, proposed feasible decoration form, realized the smooth and easy deslagging of body of heater, thereby guaranteed body of heater Operation safety and stability to have good prospects for commercial application.
Description of drawings
Fig. 1 is slag tap cyclone furnace body and the pyrolyzer radiation section body synoptic diagram of combusting coal water slurry type ethane cracking furnace.
Reference numeral: 1 is burner; 2 is insulating layer of furnace body; 3 is membrane wall; 4 is coat of silicon carbide; 5 is the cooling water inlet; 6 is vapour outlet; 7 is the slag well; 8 is scraper type slag extractor; 9 is slag collecting bunch; 10 is water-cooling jacket; 11 is burner hearth; 12 is the horizontal transition flue; 13 is the ethane cracking furnace radiation section; 14 is the ethane cracking furnace burner on sidewall; 15 is ethane cracking furnace radiation section heating surface reaction tubes.
Fig. 2 is the slag tap cyclone furnace decoration form vertical view of combusting coal water slurry type ethane cracking furnace
Reference numeral: 21 is the slag tap vertical cyclone furnace; 12 is the horizontal transition flue; 23 is the pyrolyzer body; 8 is scraper type slag extractor; 9 is slag collecting bunch; 10 is water-cooling jacket;
Fig. 3 is the firing system schema of combusting coal water slurry type ethane cracking furnace.
Reference numeral: 31 is unloading pump; 32 is the coal water slurry hold-up vessel; 33 is pump for mortar transmission; 34 is the stokehold stirred pot; 35 is slurry supply pump; 36 is the coal water slurry pot strainer; 21 is the slag tap vertical cyclone furnace; 38 is gas blower; 39 are the steam atomizing system; 13 is the ethane cracking furnace radiation section; 41 is the SCR denitrating system; 42 is sack cleaner; 43 is the circulating fluid bed semi-drying method flue gas desulfurization system; 44 is induced draft fan; 45 is chimney; 8 is scraper type slag extractor.
Embodiment
The invention thinking:
The furnace bottom of ethane cracking furnace can't be arranged water coal slurry burner, thereby needs expansion furnace of design as settling chamber.Coal water slurry is ignition in expansion furnace, and coal water slurry is burnt cinder substantially in expansion furnace, and as much as possible with the ash content in the coal water slurry from.The comparatively clean high-temperature flue gas of precell burning enters and carries out heat exchange in the pyrolyzer, reaches the similar temperature distribution of former combustion gas in the cracking burner hearth.
Consider the pyrolyzer radiation section to the requirement of high-temperature flue gas and low grey environment, the design of expansion furnace selects the slag tap cyclone furnace to have the following advantages: intensity of combustion is high, and the volume of precell is little, and compact construction is easy to arrange; Temperature of combustion is high, and burning is strong, and burnout rate Gao Keda is more than 97%; The retention efficiency of ash is up to 70% ~ 80%; High-temperature flue gas is easy to realize that temperature field similar in the pyrolyzer distributes after entering pyrolyzer, guarantees thermal exchange in the pyrolyzer; Lime-ash is easily processed and comprehensive utilization.And the problem that the dry bottom furnace scheme exists mainly contains: temperature is about 1300 ℃ in the stove in order to keep, and necessary high excess air ratio operation has obviously increased exhaust gas volumn.Main problem is after entering convection heating surface, because the increase of exhaust gas volumn, larger variation occurs the calorie distribution of each section heating surface, must adjust back-end surfaces; The diameter of precell is large, and is highly high.Layout can be had any problem when industrial application in the future.Turn to by high-temperature flue gas, the inferior separating effect of ash has about 70% ashes and brings in the stove, and heating surface and the furnace wall of pyrolyzer brought the problem of dust stratification, slagging scorification.And vertical cyclone furnace is vertical, and hot strength is high, and secondary wind speed is at 60 ~ 80 m/s, with cut to or tangential air intake, produce strong rotation in the stove, coal slurry particle and ash are separated to wall, coal mainly burns at the furnace wall face.Along with the flue gas rotation flows downward, liquid slag flows into slag bath from top to bottom.Because there is not annular inverted draft in it, thereby its retention efficiency is more lower slightly than horizontal cyclone stove, its retention efficiency is 70 ~ 80%.
Because the characteristics of cyclone furnace: water coal slurry slag-tap outlet of still flue-gas temperature high (1500 ~ 1600 ℃), excess air coefficient low (1.05 ~ 1.10), high (〉 95% of burnout rate), retention efficiency high (〉=70%).Low grey high-temperature flue gas possessed in pyrolyzer, reach and Gas phase Smoke like the condition of temperature distribution and heat exchange.
The difference of existing power station slag tap cyclone furnace and combusting coal water slurry type pyrolyzer testing apparatus is: it is coal dust that the power station slag tapping boiler uses fuel, and temperature of combustion is high, reaches about 1700 ℃; And coal water slurry contains moisture content more than 30%, and temperature of combustion is relatively low, about 1500-1600 ℃; Simultaneously, the power station stove all is large capacity, and that minimum is 65t/h, and the testing apparatus capacity is about 1/6 of the liquid stove in minimum power station, has huge otherness.Therefore, the report that does not all have the high-moisture fuel slurry in slag tapping boiler, to use both at home and abroad.
The present invention includes coal water slurry supply system, steam atomizing system, gas burning system and air and gas system, composition of the control system, below will introduce respectively flow process and the major equipment of each system.
1, coal water slurry supply system
The technical process of the supply system of coal water slurry is that coal water slurry is starched tank car through portable unloading pump by fortune, it is for subsequent use to be discharged into storage tank, coal water slurry is sent into stirred pot by pump for mortar transmission during operation, and the coal water slurry after stirring enters the coal-water slurry nozzle atomization system by slurry supply pump through coal water slurry pot strainer, coal water slurry under meter.The coal water slurry amount of jet combustion is controlled with the slurry supply pump speed control by frequency variation, and is back to the stirred pot auxiliary adjustment with the part coal water slurry.Coal water slurry refluxes and also has when spray nozzle clogging, the function that the protection water-coal slurry pump avoids superpressure to damage.
2, steam atomizing system
Atomizing steam is by factory's self-produced steam supply, and the required steam parameter of wherein steam atomizing system is P=0.15MPa, and T=300 ℃, steam flow calculates according to 0.3kg steam/kg coal water slurry.The atomizing steam of coal water slurry is by this system supply.
3, gas ignition system
Gas burning system is to use methane hydrogen as igniting and guarantee fuel, methane hydrogen is through gas meter, (emergency shutdown valve and flame detector are chain for emergency shutdown valve, emergency shutdown when combustion gas is put out a fire, warranty test stove safety), the gas ignition device that enters at last burner burns, and is furnished with safety valve, tensimeter etc. in system.
4, air and gas system
Air and gas system is air feed and the flue gas system of body of heater burning.Air feed system is blown by high pressure positive blower, and the measuring apparatus of total blast volume is installed in total air delivery duct, and the remote control adjustment air door is installed.Total wind is dispensed to airduct, combustion gas airduct, burner secondary air channel one time.Upper Tangential Wind is two nozzles totally four spouts and tangential spout of lower after-flame wind each side, about each two totally four spouts, each airduct all is equipped with flow measurement device and damper is respectively arranged, the air quantity of each spout is regulated according to the operating mode of burning.
Flue gas enters convection zone through the outlet of pyrolyzer radiation section and cools off, arrange the SCR denitrification apparatus in the zone that flue-gas temperature is down to about 300 ~ 400 ℃, the flue gas that leaves pyrolyzer after denitration enters sack cleaner and carries out dedusting, send into thionizer by induced draft fan afterwards and carry out desulfurization, enter atmosphere through chimney afterwards.
5, supervisory system
The supervisory system of pyrolyzer adopts the computer centralized monitoring system, realizes the monitoring of each system operational parameters and the automatic control of each equipment.
The design coal that the present invention relates to considers that China Firing Shenhua Coal coal source is abundant, ash fusion point low (1200 ℃), ash is low, but difficult slurrying, concentration is hanged down 62-64%, the practical situation of calorific value about 4300Kcal/Kg, most coal water slurry are that applicable Industrial Boiler uses simultaneously, its ash fusion point requires more than 1300 ℃, and Firing Shenhua Coal interpolation high-ash-fusion coal is made, and inapplicable slag tapping boiler.Therefore, the following coal water slurry of final choice is as design coal:
| C | H | O | N | S | A | W |
| 49.47 | 2.85 | 5.13 | 0.56 | 0.38 | 6.49 | 35.12 |
Further specify below in conjunction with accompanying drawing 1 and accompanying drawing 2, Fig. 1, Fig. 2 are slag tap cyclone furnace body and the pyrolyzer radiation section body synoptic diagram of specific embodiment 1 combusting coal water slurry type ethane cracking furnace.Described water coal slurry slag-tap cyclone furnace body is as the expansion furnace of pyrolyzer, according to the maximum methane hydrogen consumption 5200Nm3/h of SRT-IV type ethane cracking furnace, its calorific value 12850Kcal/Nm
3And the coal water slurry parameter carries out heat conversion, consider simultaneously base burning device combustion gas share 70%, and with reference to combustion methane hydrogen efficiency (94%), combusting coal water slurry efficient (92.02%) revised, and calculating combustion slurry total amount is 10.924t/h.SRT-IV pyrolyzer base burning device gas quantity is 70%, and totally 24 both sides are arranged, 12 of every sides, and pyrolyzer width 16050mm divides three to stride, and span 5473mm whenever strides and arranges 4 gas burners.Consider the homogeneity that slag tap vertical cyclone furnace high-temperature flue gas introducing pyrolyzer and flue gas distribute, design 6 slag tap vertical cyclone furnace schemes, 3 of every sides, the per two groups of heating surfaces of pyrolyzer are a slag tap vertical cyclone furnace each side, and every slag tap vertical cyclone furnace substitutes four base burning devices.
Slag tap vertical cyclone furnace scantlings of the structure and design variable are as follows:
Table 1 cyclone furnace scantlings of the structure
| The capacity of cyclone furnace | Coal water slurry 1820kg/h |
| The coal water slurry calorific value | 4373Kcal/kg |
| Thermal load of |
9*10^6Kcal/m2*h |
| Testing apparatus Qf | 6.874*10^6?Kcal/m2*h |
| Volume heat load Qv | 2.*10^6Kcal/m3*h |
| Testing apparatus Qv | 2.291?*10^6Kcal/m3*h |
| The effective inside diameter D n of cyclone furnace | Ф1070mm |
| Cyclone furnace virtual height H | 5800mm |
| Water cooling tube diameter D/s | 38/5mm |
| Cyclone cylinder relative length L/D | 5.42 |
| Solid, liquid attitude thickness of slag layer | 80mm |
| Silicon carbide casting material thickness | 20mm |
| Insulation layer thickness | 350mm |
| The cylindrical shell external diameter | Ф2030mm |
| The cyclone furnace outlet size | 1400*1000mm |
The structure of water coal slurry slag-tap stove is seen accompanying drawing 1.The internal diameter Ф 1070mm of test precell 11, height 5800mm, burner 1 is arranged in the top of test furnace, and two-layer (four) tangential overfire air port is arranged on expansion furnace 11 tops, at lower disposed two-layer (four) tangential firing overfire air port.Slag hurdle and slag well 7 are in the bottom of burner hearth, and liquid slag is fallen water-cooled slag well, by scraper slagging machine 8 slag are entered the slag car and transport.
There are the defectives such as long construction period that refractory brick life is short, cost is high and change maintenance in the slag tap vertical cyclone furnace as adopting adiabatic furnace wall, comparatively reasonably arranges it is to adopt water cooled furnace wall, i.e. film water cold wall structure.The water wall tube scantlings of the structure is Ф 38*5, the slag nail that gathers on the surface of water cooling tube 3, and slag nail L/d=15/10mm smears carborundum coating 4 at the membrane wall inner surface that is abound with the slag nail, silicon carbide bed thickness 20mm wherein, the thick 80mm of the slag blanket of formation in service.Lay the lagging material 2 of appropriate size at the membrane wall outer surface.The water coolant of water wall tube cooling system is entered by the cooling water inlet 5 near furnace bottom, and after furnace wall heat exchange and the separation of drum carbonated drink, steam is discharged by the vapour outlet 6 of upper furnace.
Membrane wall can cause certain influence to the temperature of cyclone cylinder, and temperature of combustion is reduced, and considers in the adiabatic stable burning room that all arranges long about a meter on the slag tap vertical cyclone furnace.Therefore use the laying fireproof bricks adiabatic wall in the 1000mm scope of the top of burner hearth, can improve the temperature of coal water slurry fire area, the furnace wall is not subjected to the erosion of liquid slag without liquid slag, to the catching fire and burn favourablely of coal water slurry, can reduce again the steam generation.
The design of table 2 slag film thickness
| Title | Unit | Design result |
| Theoretical combustion temperature | ℃ | 1677 |
| Inlet air temp | ℃ | 30 |
| Slag film surface temperature | ℃ | 1490 |
| Slag membrane flow layer thickness | mm | 7 |
| The motionless layer thickness of slag film | mm | 73 |
| The slag blanket total thickness | mm | 80 |
| Pin size l/d | mm/mm | 15/10 |
| The slag nail is arranged density | 0.2(about 2300/m 2） | |
| Slag nails on lining thickness | mm | 3 |
| The water wall tube size | mm | Ф38*5 |
The water coolant of the screen tube 9 of transition flue duct adopts and the same system in combustion chamber, system is simple and reliable, is 1.5 times of cyclone combustion chamber according to the share of calculating its heat absorption, and the spacing of screen tube is little, consider coating and solid-state slag blanket, the external diameter of screen tube is Ф about 80.
Below in conjunction with accompanying drawing 2 and specific embodiment the present invention is described in further detail.
A kind of slag tap vertical cyclone furnace take coal water slurry as fuel comprises following processing step as the technical scheme of pyrolyzer precell:
(1) the special-purpose pyrolyzer burner 1 of coal water slurry/gas is arranged in the top of precell 11, coal water slurry sprays into burner by the atomizing of burner center coal water slurry rifle, the flow angle of water-coal-slurry atomizing nozzle adopts 45 ° ~ 55 ° scopes, increases in allowed limits flow angle and can make fuel be rotated rapidly pneumatic separation after leaving burner to carry out adherent burning to the furnace wall.But excessive flow angle can cause fuel do not leave the burner settling chamber or do not catch fire before contact the furnace wall, be unfavorable for the burning.The primary and secondary air outlet of burner all arranges the swirl vane of certain angle, in conjunction with the tangential secondary air that enters burner hearth by cylinder secant direction, can make and form stronger vortex gas-flow in the stove, and because the effect of entrainmenting forms certain axial inverted draft, be referred to as to reflux.Backflow is the furnace high-temperature flue gas, is favourable to catching fire of coal water slurry.
(2) burner 1 adopts little primary air ratio about 10 ~ 15%, low wind speed, simultaneously under the effect of the strong rotation of at a high speed tangential secondary air, make coal slurry particle and lime-ash under the effect of centrifugal force, be separated to wall, the silicon carbide wall and near acutely burn and form liquid slag blanket 4.The liquid slag blanket 4 of furnace wall flows in the slag bath of furnace bottom from top to bottom.Slag is in the slag bath overflow weir flow to water-cooled slag hurdle and slag well 7.The wall burning of the combustion system of slag tap vertical cyclone furnace for forming by strong swirling eddy, the liquid slag film that wall forms has certain flowability and viscosity, the lime-ash that fuel combustion is generated has stronger capturing ability, can reduce fly ash granule and enter pyrolyzer radiation section 13.
(3) bottom of horizontal transition flue 12 is 5 ° inclined-plane, in order to allow the liquid slag of the interior cohesion of transition flue duct can flow automatically to the liquid slag pond.Arranged the slag collecting bunch 9 that four misarrangements are listed as in the import of transition flue duct, screen tube 9 adopts water-cooling structures, and the outside is coated with carborundum refractory.The High Temperature Rotating air flow divert is by slag collecting bunch 9, and the thin liquid slag particle of flue gas further catches at interbank quilt, and it can catch the slag more than 20%.Through the high-temperature flue gas of screen tube, through horizontal transition flue 12, arrive the import of pyrolyzer radiation section 13.Afterwards high-temperature flue gas in pyrolyzer radiation section 13 with heating surface reaction tubes 15 in feed naphtha generation heat exchange, thereby pyrolysis generation ethene.30% heat in the pyrolyzer radiation section 13 uses methane hydrogen by burner on sidewall 14 to be provided.
(4) liquid slag of horizontal transition flue 12 and screen tube 9 seizure also flows back to slag well 7.The volume of slag tap cyclone furnace is compact, and coal water slurry is very short at residing time in furnace, because thumping majority coal slurry particle separation to wall, in the wall burning, only has very thin particle at space combustion, its burnout rate reaches more than 95%.Can reach more than 97% through its burnout rate behind the horizontal flue.
(5) in the situation of slag tap, most furnace bottom slag is to be the attached wall slag that liquid state flows down to consist of.Furnace wall thermal insulation layer material 2 and the carborundum coating 4 of cyclone cylinder cause certain thermal resistance, thereby improved the temperature levels of combustion chamber, be beneficial to the fusing of lime-ash, the lime-ash that has liquefied is attached on the furnace wall at first, because water wall tube 3 makes its cooling, new slag continuously adheres on the furnace wall, when reaching certain thickness, just the layer of solid slag that keeps one deck substantially to remain static on the furnace wall, be referred to as the slag film, on the surface of slag film, because the increase of thermal resistance, reach at last the slag that is deposited on the slag film and can not get well cooling and be flow state on the surface of slag film, form liquid slag blanket 4.The continuous viscous of slag is on the slag film, and along wall inflow slag bath, the thickness of slag film changes with the temperature of burner hearth, temperature is higher, slag film attenuate, but because the attenuate of slag film, the burner hearth caloric receptivity is increased, have influence on again conversely fire box temperature, last burner hearth caloric receptivity, slag film thickness, fire box temperature level reach an equilibrium state, and this equilibrium state will reach with the variation of operation condition new balance.
It is a kind of for realizing that coal water slurry substitutes methane hydrogen as the equipment of ethane cracking furnace fuel that the present invention also provides, 3 in detail this device systems is described in detail by reference to the accompanying drawings, mainly comprises unloading pump 1, water coal slurry tank 2, pump for mortar transmission 3, stokehold stirred pot (containing liquidometer) 4, slurry supply pump 5, pot strainer 6, slag tap cyclone furnace body 7, coal water slurry steam atomizing system 9, gas blower 8, SCR denitrification apparatus 11, sack cleaner 12, circulating fluid bed semi-drying method desulfurizer 13, induced draft fan 14, chimney 15, combusting coal water slurry in scraper slagging machine 16 and the accompanying drawing 1/gas two-purpose burner 1.
The decoration form of slag tap cyclone furnace is the scheme of 12 cyclone cylinders in the specific embodiment 2,6 of the every sides of pyrolyzer, and every substitutes two base burning devices.Its parameters of structural dimension sees Table 3.All the other steps are all identical with specific embodiment 1.
12 cyclone furnace scenario-frames of table 3 size
| 12 cyclone furnace schemes | |
| The capacity of cyclone furnace | Coal water slurry 910kg/h |
| The coal water slurry calorific value | 4373Kcal/kg |
| Thermal load of |
9*10^6Kcal/m2*h |
| Testing apparatus Qf | 6.874*10^6?Kcal/m2*h |
| Volume heat load Qv | 2.*10^6Kcal/m3*h |
| Testing apparatus Qv | 2.291?*10^6Kcal/m3*h |
| The effective inside diameter D n of cyclone furnace | Ф750mm |
| Cyclone furnace virtual height H | 4500mm |
| Water cooling tube diameter D/s | 38/5mm |
| Cyclone cylinder relative length L/D | 6 |
| Solid, liquid attitude thickness of slag layer | 80mm |
| Silicon carbide casting material thickness | 20mm |
| Insulation layer thickness | 350mm |
| The cylindrical shell external diameter | Ф1700mm |
| The cyclone furnace outlet size | 750*650mm |
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged, such as coal water slurry coal type change, slag tap cyclone furnace load variations etc.
The present invention can summarize with other the specific form without prejudice to spirit of the present invention and principal character.Therefore, no matter from which point, above-mentioned embodiment of the present invention all can only be thought can not limit the present invention to explanation of the present invention, claims have been pointed out scope of the present invention, and scope of the present invention is not pointed out in above-mentioned explanation, therefore, in the implication suitable with claims of the present invention and any change in the scope, all should think to be included in the scope of claims.
Claims (8)
1. the ethane cracking furnace firing system take coal water slurry as fuel comprises ethane cracking furnace, it is characterized in that, this firing system is with the extended furnace of slag tap vertical cyclone furnace as ethane cracking furnace; Described slag tap vertical cyclone furnace has the body of heater of column, and burner is established at its top, and burner has methane hydrogen burning mouth and water-coal-slurry atomizing nozzle; Establish a wind outlet at the burner place, arrange tangential overfire air port in upper furnace, arrange tangential burning overfire air port in lower furnace portion; Between burner hearth bottom and ethane cracking furnace radiation section bottom the horizontal transition flue is set, the ingress of horizontal transition flue is staggered in arrangement vertical slag collecting bunch; Establish the slag hurdle in the bottom, the below on slag hurdle is provided with the slag well.
2. firing system according to claim 1, it is characterized in that, the body of heater of described slag tap vertical cyclone furnace is film water cold wall structure: adiabator layer is established in the outside, the centre is water wall tube, and the inner surface of water wall tube gathers, and slag is followed closely and follow closely the surperficial carborundum coating layer that coating is set at inner surface and slag; The furnace bottom place establishes the cooling water inlet that connects water wall tube, and upper of furnace body is established vapour outlet, and vapour outlet is connected to water wall tube through drum.
3. firing system according to claim 2 is characterized in that, between the body of heater of the burner of described slag tap vertical cyclone furnace and film water cold wall structure, also is provided with an adiabatic stable burning room, and its furnace wall is the adiabatic wall of laying fireproof bricks.
4. firing system according to claim 1 is characterized in that, described tangential overfire air port and burning overfire air port respectively have four, and every kind of spout is divided into two-layer layout.
5. firing system according to claim 1 is characterized in that, the bottom of described horizontal transition flue is the inclined-plane that is 5 ° of angles with horizontal direction, and its end that is connected to ethane cracking furnace radiation section bottom is a higher end; The horizontal transition flue has the two-part structure: the main part that connects burner hearth bottom is film water cold wall structure, its outside establishes adiabator layer, middle is water wall tube, gather slag nail and the carborundum coating layer of coating is set on inner surface and slag nail surface of the inner surface of water wall tube; The part that connects ethane cracking furnace radiation section bottom is water-cooling jacket.
6. firing system according to claim 1 is characterized in that, the outside encirclement of each pipe fitting of described slag collecting bunch arranges water-cooling jacket, and the carborundum refractory layer of coating is established in the outside of water-cooling jacket.
7. according to claim 1 to the firing system described in 6 any one, it is characterized in that described slag tap vertical cyclone furnace has 6, be located at respectively the both sides of ethane cracking furnace, each one of per two groups of heating surface left and right sides.
8. according to claim 1 to the firing system described in 6 any one, it is characterized in that this system also comprises:
By unloading pump, water coal slurry tank, pump for mortar transmission, stokehold stirred pot, slurry supply pump, pot strainer that pipeline connects successively, pot strainer is connected to the burner at body of heater top through magnetic flow meter;
Be connected in the coal water slurry steam atomizing system of body of heater top burner by pipeline;
By gas blower butterfly valve, the differential pressure pickup that pipeline connects successively, differential pressure pickup is connected to the burner and each spout of being located in the burner hearth at body of heater top by the road;
By SCR denitrification apparatus, sack cleaner, circulating fluid bed semi-drying method desulfurizer, induced draft fan and chimney that pipeline connects successively, the SCR denitrification apparatus is connected to the exhanst gas outlet of ethane cracking furnace;
Be located at the scraper type slag extractor of slag downhole, scraper type slag extractor is connected to the granulation case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210387479.XA CN102925195B (en) | 2012-10-12 | 2012-10-12 | Ethylene cracking furnace combustion system taking water-coal-slurry as fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210387479.XA CN102925195B (en) | 2012-10-12 | 2012-10-12 | Ethylene cracking furnace combustion system taking water-coal-slurry as fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102925195A true CN102925195A (en) | 2013-02-13 |
| CN102925195B CN102925195B (en) | 2014-09-03 |
Family
ID=47640128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210387479.XA Expired - Fee Related CN102925195B (en) | 2012-10-12 | 2012-10-12 | Ethylene cracking furnace combustion system taking water-coal-slurry as fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102925195B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111423898A (en) * | 2020-05-09 | 2020-07-17 | 重庆科技学院 | Double-cyclone furnace type waste plastic recycling system and process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57202380A (en) * | 1981-06-09 | 1982-12-11 | Niigata Eng Co Ltd | Tubular heating furnace |
| JPS62190314A (en) * | 1986-01-17 | 1987-08-20 | Takuma Co Ltd | High load combustion method for coal and water slurry and device thereof |
| CN201093483Y (en) * | 2007-08-28 | 2008-07-30 | 南京圣诺热管有限公司 | Chemical industry heating furnace with coal water slurry as fuel |
| WO2010027541A1 (en) * | 2008-09-05 | 2010-03-11 | Exxonmobil Chemical Patents Inc. | Furnace and process for incinerating a decoke effluent in a twin-tube-plane furnace |
| CN101743439A (en) * | 2007-05-18 | 2010-06-16 | 鲁姆斯科技公司 | Heater and operation method |
| CN102295461A (en) * | 2011-06-02 | 2011-12-28 | 江苏君耀耐磨耐火材料有限公司 | Junya red brick for petrochemical heater and preparation process thereof |
| CN102337147A (en) * | 2010-07-20 | 2012-02-01 | 上海紫成信息科技有限公司 | Method for efficiency improvement of horizontal tube bottom combustion vertical furnace |
-
2012
- 2012-10-12 CN CN201210387479.XA patent/CN102925195B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57202380A (en) * | 1981-06-09 | 1982-12-11 | Niigata Eng Co Ltd | Tubular heating furnace |
| JPS62190314A (en) * | 1986-01-17 | 1987-08-20 | Takuma Co Ltd | High load combustion method for coal and water slurry and device thereof |
| CN101743439A (en) * | 2007-05-18 | 2010-06-16 | 鲁姆斯科技公司 | Heater and operation method |
| CN201093483Y (en) * | 2007-08-28 | 2008-07-30 | 南京圣诺热管有限公司 | Chemical industry heating furnace with coal water slurry as fuel |
| WO2010027541A1 (en) * | 2008-09-05 | 2010-03-11 | Exxonmobil Chemical Patents Inc. | Furnace and process for incinerating a decoke effluent in a twin-tube-plane furnace |
| CN102337147A (en) * | 2010-07-20 | 2012-02-01 | 上海紫成信息科技有限公司 | Method for efficiency improvement of horizontal tube bottom combustion vertical furnace |
| CN102295461A (en) * | 2011-06-02 | 2011-12-28 | 江苏君耀耐磨耐火材料有限公司 | Junya red brick for petrochemical heater and preparation process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 周俊虎，张传名，曹晓哲，赵卫东，刘建忠，岑可法: "低挥发分水煤浆在筒形炉内燃烧特性的实验研究", 《动力工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111423898A (en) * | 2020-05-09 | 2020-07-17 | 重庆科技学院 | Double-cyclone furnace type waste plastic recycling system and process |
| CN111423898B (en) * | 2020-05-09 | 2024-03-01 | 重庆科技学院 | Double cyclone furnace type waste plastic recycling treatment system and process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102925195B (en) | 2014-09-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101707893B (en) | Air heater | |
| CN105674232B (en) | A kind of biomass micron fuel hot industry boiler of clean and effective | |
| CN101334164B (en) | Industrial boiler combustion method | |
| CN202675267U (en) | Coal powder combustion device with high temperature but low NOx | |
| CN101666489A (en) | Combustion device of petroleum coke slurry | |
| CN101220299A (en) | Device and method for production synthesis gas energy conservation and emission reduction of static bed gas making furnace | |
| CN105737140A (en) | Cyclone combustion apparatus, combustion device and combustion method | |
| CN102816605A (en) | Two-section type multi-nozzle gasifying furnace with hierarchical oxygen supplying function and gasifying method of gasifying furnace | |
| CN105299626A (en) | Combustion system and combustion method for retarding slagging and contamination of high-alkali coal boiler for combustion | |
| CN104819472A (en) | Biomass solid waste and hazardous waste combustion gas production system | |
| CN101586805B (en) | Combustion device for biomass granular fuel | |
| CN103937555A (en) | Single-nozzle water-coal-slurry entrained-flow bed gasifier and gasification method of same | |
| CN104312634A (en) | Composite thermal oxidative nozzle and application thereof | |
| CN102925195B (en) | Ethylene cracking furnace combustion system taking water-coal-slurry as fuel | |
| CN102911707B (en) | Ethylene cracking furnace production method adopting burning coal water slurry as fuel | |
| CN209524497U (en) | A kind of stable biomass solid fuel high efficient combustion device | |
| CN104180385A (en) | Carbocoal heat carrier system and method for preventing pulverized coal furnace from contamination | |
| CN103383143A (en) | Novel efficient air heater | |
| WO2021043241A1 (en) | Pulverized coal boiler with bottom combustor, and control method therefor | |
| CN101852550B (en) | Tubular industrial heating furnace | |
| CN203845998U (en) | Single-nozzle water-coal-slurry entrained-flow bed gasifier | |
| CN101825276B (en) | Energy-saving environment-friendly liquid slag removal type coal-fired heating system | |
| CN201772450U (en) | Low-NOx solid-liquid deslagging double-whirl pulverized coal combustion device | |
| CN204174180U (en) | A kind of combined type heat oxygen nozzle | |
| CN207527565U (en) | A kind of circle of contact pulverized coal decoupling combustor group and burner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20161012 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |