CN85104678A

CN85104678A - A kind of tunnel furnace to the carbon product re-baking behind bituminizing

Info

Publication number: CN85104678A
Application number: CN198585104678A
Authority: CN
Inventors: 林小峰; 梁兆华
Original assignee: JILIN CARBON FACTORY; Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Current assignee: JILIN CARBON FACTORY; Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Priority date: 1985-06-10
Filing date: 1985-06-10
Publication date: 1987-08-19

Abstract

A kind of tunnel furnace to the carbon product re-baking behind bituminizing.The need baked article is contained in the sealed sagger on the kiln car.The bitumen flue gas that produces in the roasting is derived outside the kiln from the different export mouths of saggar respectively with pitch.Derive bitumen flue gas by sealing-duct and burn as part of heat energy, eu-bitumen can be made fuel also can make raw material usefulness.Hot gas also is used as stirring and heated air in the kiln, thereby improves kiln thermo-efficiency, decontamination, has improved quality product, and construction investment is also economized.The present invention is not only applicable to the re-baking of carbon product, and is applicable to the roasting through bitumen-impregnated refractory materials.

Description

A kind of tunnel furnace to the carbon product re-baking behind bituminizing

The present invention is to bakes to burn the article after the tunnel furnace of bitumen-impregnated carbon product re-baking belongs to International Classification of Patents COlB 31/04.

Common re-baking method is, with the carbon product behind the eu-bitumen dipping bakes to burn the article, it is placed in the saggar of pottery or metal carries out re-baking in tunnel furnace.Become at present the effective means of carbon products such as preparation big specification, superpower and ultra-high power graphite electrode.For the reasonable utilization of kiln heat, problems such as bitumen flue gas that produces in the roasting and bituminous utilization, some charcoal ink factory men have made a few thing recently, are exactly wherein a kind of as United States Patent (USP) 4128394 described technology.The principal character of this technology is that the middle part of kiln is provided with a.The saggar (the saggar loam cake has left a lot of holes) of open type that the carbon product of re-baking is housed is placed on the mobile kiln car.Gas face circulation device is housed on the roasting band of kiln.When the hot gas in the kiln rises, baking carbon product in the saggar and in the glance coal that produces and the kiln gas collect in a together and expel from kiln.These high-temperature flue gas are drawn into the combustion chamber, run into the flame of fuel combustion there and burnt, become clean high-temperature gas, send into through high-temperature blower and to come the roasting carbon product in the kiln, and the contained pitch of the carbon product of re-baking, a part flows down in giving heat, roasting process, the pitch that accumulates in the saggar bottom receives in the chassis, and along with the carrying out of roasting, pitch is become semicoke by destructive distillation.

This invention exists following shortcoming:

1, the bitumen flue gas in the saggar mixes the back extraction with kiln atmosphere, its shortcoming is that bitumen flue gas is an inflammable gas, and be oxidizing atmosphere in the kiln, both are blended in the concentration that must adopt strict scientific method control oxygen in the extraction, otherwise can be easy to blow out or explosive accident in the pipeline of extracting out, incinerator, blower fan system.

2, so-called control oxygen concn, the actual ratio that will control exactly between interior gas volume of kiln and the glance coal amount, but the factor that constitutes this amount ratio is a lot, very complicated, is difficult to grasp.Specification, batch, the differences such as content of bituminizing in goods such as the carbon product of re-baking, at any time change, the goods difference, the roasting curve is also not the same or the like, one of them factor changes, the ratio of two kinds of above-mentioned amounts will change, and kiln temperature, pressure change slightly also can influence the ratio of two kinds of amounts.Control its concentration more accurately, just must complicated Controlling System and the regulation system of one cover be set with considerable fund.And still keep away unavoidable complicated operation, regulate the shortcoming of difficulty.

3, gas mixes the processing method of extracting out in glance coal and the kiln, in case temperature control is bad, glance coal is easy to catch fire in exhaust ports generation local irregularities's property of saggar loam cake, causes partial combustion to cause the saggar early oxidation to destroy, and improves the roasting cost; Oxidizing gas might enter at any time and cause the goods oxidation in the saggar in the kiln.

Saying according to United States Patent (USP) 4128394, they adopt the gas recirculation system of quadruplet complexity (to comprise incinerator, high-temperature blower, pipeline etc.) and Controlling System solve this two problems, but this blower fan, complex structure and material requirements height, involve great expense, production control needs tight means.And to increase power consumption all the year round.

4, pitch destructive distillation in the saggar chassis becomes semicoke, though can be used as coke recycles, but facts have proved, the burnt all coking of this destructive distillation is on the chassis, close-burning gets very solid, also be difficult to take off with pneumatic pick, this just needs a large amount of cleaning labour cost of spend, or special cleaning mechanical means is set.

The present invention has done improvement at above-mentioned shortcoming, and its content accompanying drawings is as follows:

Accompanying drawing 1 for the I among the system diagram figure of re-baking device of the present invention for giving the torrid zone; II is the roasting band; III is a cooling zone;

1 is tunnel furnace, and 2 is exhaust blower, and 3 is the glance coal export agency, and 4 is that hot flue gas stirs blower fan, and 5 is the gas burner, and 6 for bitumen flue gas burns the cinder chamber, and 7 is pitch burning chamber, and 8 is burner blower, and 9 for forcing cooling to use blower fan, and 10 is the pitch take-up gear, and 11 is pitch

Groove; 12 is bitumenpump, enters in several bitumen flue gas burning chamber 6 after bitumen flue gas is derived by take-up gear to burn.Eu-bitumen enters pitch after take-up gear is derived from kiln

Jar.Burn with being pumped to pitch burning chamber after filtering in 11, or return production system.

Accompanying drawing 2 is sectional drawings of after baking device of the present invention, is 13 for the saggar loam cake among the figure, and 14 is the saggar chassis, and 15 is the pitch conduit, and 16 is pitch burning chamber, and 17 is the pitch burner.

Accompanying drawing 3 is enlarged views of I in the accompanying

drawing

2, and 18 is inner catheter among the figure, and 19 is the glance coal outlet, and 20 is outer catheter, 21 is conduit outlet, and 22 are cover, and 23 is actuating unit such as cylinder, and 24 is valve body, 25 are the end bar, and 26 is flashboard, and 27 is sealing material, and 28 is the saggar loam cake.

Accompanying drawing 4 is enlarged views of II in the accompanying

drawing

2,29 is the saggar chassis among the figure, and 30 for pitch flows out bell, and 31 is tapered plug, 32 is turning handle, 33 is turning handle, and 34 is the turning handle bar, and 35 is actuating unit such as cylinder, 36 is power push-rod, 37 is the pitch conduit, and 38 is the tunnel furnace side wall, and 39 is the refractory materials building block of hot-gas channel.

The present invention is the tunnel cave to the carbon product after baking behind the bituminizing, and tunnel cave 1 is divided into and gives the torrid zone, roasting band and salband as shown in Figure 1. The kiln lower sidewall is provided with heated air and sprays into the hole, the mobile kiln car that some connect together in the kiln, the built on stilts saggar that filling on each kiln car, the carbon product that needs after baking is housed in the saggar, and each saggar is for what seal, and saggar is made up of chassis 29 and loam cake 13, sealed by encapsulant between chassis 29 and the loam cake 13, a bitumen flue gas export mouth that automatic valve 26 is housed is arranged on each sealed sagger top, and as shown in Figure 3, valve is realized with closing by counterweight. Be provided with as shown in Figure 4 pitch in the saggar bottom and flow out bell 30, this mouthful closed by conical plug 31 at ordinary times, keeps to the side to be provided with by turning handle 32, turning handle plate 33, and turning handle bar 34 forms mechanism. When turning handle plate 33 was promoted by push rod 36 by actuating unit such as cylinder 35, handle handle 33 rotated, turning handle bar 34 jack-up conical plugs 31, and the liquid asphalt in the saggar chassis 29 flows out, and the pitch conduit 37 below flowing into is derived outside the kilns. The bitumen flue gas that produces in the saggar is derived by top derivation mechanism 3, and the bitumen flue gas of derivation is introduced into burning chamber's 6 burnings, and the hot flue gas after the burning enters heating saggar in the kiln. The liquid asphalt of deriving enters Asphalt tank 11, burns with being pumped to pitch burning chamber after filtering, or returns production system as raw material.

When kiln car stops by instruction, cylinder 23 actions, inner catheter 18 and cover 22 descend and are inserted in 27 li of saggar loam cake 13 sealing materials, cylinder 23 continues to descend and promotes, valve body 24 is opened, and by holding bar 25 to back down flashboard 26, the glance coal outlet and inner catheter 18 passages of saggar loam cake 28 are connected, and the glance coal outlet 19 of conduit outlet 21 and outer catheter 20 is connected simultaneously.Saggar, bitumen flue gas export agency and glance coal burner constitute a glance coal siphunculus that is hedged off from the outer world at this moment.By the injection negative pressure of malleation in the saggar and glance coal burner, the glance coal that produces in the saggar is introduced in the burner burnt.So both guaranteed that the glance coal in the saggar did not escape in the kiln, guaranteed also that gas did not escape into the interior accidents such as causing combustion explosion and oxidation goods of mixing with glance coal of saggar in the kiln.At first instruct cylinder 23 upwards to move by instrument when kiln car is intended moving forward, earlier valve body 24 is closed, end bar 25 makes progress simultaneously, disengages with flashboard 26, and then flashboard 26 cuts out automatically owing to the counterweight effect.Carry inner catheter 18 then, cover 22 rises thereupon, and outlet 21 and pitch outlet 19 stagger, and after the cut-out 19 and 21, kiln car moves forward a parking stall.Promptly in the short period of time that kiln car moves, saggar is still located air-tight state.Bitumen flue gas does not promptly leak, and gas can not enter in the kiln, and valve body 24 is in closing condition in the derivation mechanism simultaneously, makes in bitumen flue gas extraction channel and the kiln isolated yet.

For the derivation of eu-bitumen, the present invention is exactly on the appropriate position of kiln, and fixed eu-bitumen conduit is set, and to the top-pushing mechanism that is provided with on a left side, for example cylinder pushing tow.When kiln car is stated specified location by instructing to, tapered plug is pushed in the cylinder action open, accumulates in the pitch in the saggar, flows to the pitch that is fixed in the kiln from bell and accepts to draw outside the kiln in the funnel.After pitch flow to end in the saggar, cylinder push-rod returned, and tapered plug 31 is clogged bell 30 by deadweight, makes saggar airtight.

Saggar of the present invention be knockdown, can join by several piece pottery and metal sheet device and form, but adopt the thin plate assembling of heat resisting iron material better, when local oxidation, only need change a certain block of plate and get final product, need not saggar is all scrapped, the saggar life-span is long, and the roasting cost is low.

Kiln of the present invention is to utilize the hot gas of cooling zone as combustion air, blower fan 9 by accompanying drawing 1 is sent cold wind into the cooling zone refrigerated product, and then will give gas hot and extract out sending in each combustion chamber 5,6,7 as combustion air by blower fan 8 and go, to make full use of the waste heat of cooling zone, improve thermo-efficiency.Kiln of the present invention also is provided with hot flue gas recirculation system, after extracting out, the hot flue gas that will give tropical high-temperature zone and roasting band cold zone with blower fan 4 sends into the cold zone that gives the torrid zone, as the stirring gas that gives tropical cold zone, reduce upper and lower temperature difference, with the heat of giving of quickening these district's goods, reduce and give the hot time, improve thermo-efficiency.Give heat, roasting, the cooling of kiln respectively are with temperature and negative pressure all can regulate in addition, make it near or reach the roasting effect of setting.

In sum compared with the prior art, gas is separately led to separately and is incinerated in the burning chamber in bitumen flue gas that the present invention produces in the time of making roasting and the kiln, avoid a large amount of glance coals ease in kiln, not only saved the energy but also perfect the pollution that has solved environment; The present invention during with roasting from pickled product effusive pitch derive outside the kiln, both can be used as fuel in kiln body burning chamber internal combustion as the energy, also can return production system as raw material, thus avoided pitch in kiln to outer trickling or coking and cause cleaning difficulty on the saggar chassis.Therefore, the present invention has less energy-consumption.Pollution-free, high-level efficiency, low cost, reduced investment and equipment is advantage such as solution easily.It is not only applicable to the re-baking of carbon product, is applicable to the roasting of bitumen-impregnated refractory materials yet.

Claims

1, a kind of tunnel furnace to the carbon product re-baking behind bituminizing, kiln is divided into and gives the torrid zone, roasting band and cooling zone, kiln lower sidewall are provided with heated air and spray into the hole, on the mobile kiln car that some connect together in the kiln, each car saggar is housed all, interior dress needs the carbon product of re-baking, it is characterized in that each saggar of the carbon product of dress re-baking all is sealing and fabricated.A bitumen flue gas export mouth that automatic valve is housed is arranged on sealed sagger top; An eu-bitumen export mouth that automatic valve is housed is arranged at the bottom, and bitumen flue gas that produces in the roasting and pitch are derived outside the kiln by two export mouths respectively, acts as a fuel, and the high-temperature flue gas after the burning is directly sent in the kiln as the part thermal source.The pitch of deriving also can be used as raw material and uses.

2, it is characterized in that on the specified location of tunnel furnace, being provided with several bitumen flue gas delivery lines by the said bitumen flue gas take-up gear of claim 1, the bitumen flue gas delivery line is the telescopic sleeve pipe structure, and constitute an open valve, be provided with seal closure in the conduit lower end.

3,, it is characterized in that bitumen flue gas is to be extracted out by the burner that has ejection structure by the deriving method that in the described roasting of claim 1 bitumen flue gas is acted as a fuel.

4, it is characterized in that by the described roasting medium pitch of claim 1 take-up gear, on the tunnel furnace specified location, be provided with automatic jacking mechanism and conduit that pitch is derived valve.

5, the assembled saggar by the described sealing of claim 1 is characterized in that saggar is to be assembled by the several piece metal sheet, and metal sheet is as the criterion with heat resisting iron.

6, the described tunnel furnace molecule of claim 1 is for giving the torrid zone, roasting band and cooling zone, it is characterized in that utilizing the combustion air of the hot flue gas of cooling zone, utilize the hot flue gas that gives tropical high-temperature zone and roasting band cold zone as the gas that gives the heating and the stirring of tropical cold zone as roasting band burning usefulness.