CN105036133A - Technology and system for combined use of calcium carbide furnace and vertical furnace - Google Patents
Technology and system for combined use of calcium carbide furnace and vertical furnace Download PDFInfo
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- CN105036133A CN105036133A CN201510441080.9A CN201510441080A CN105036133A CN 105036133 A CN105036133 A CN 105036133A CN 201510441080 A CN201510441080 A CN 201510441080A CN 105036133 A CN105036133 A CN 105036133A
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- calcium carbide
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- spray gun
- reducing gas
- coal dust
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 title claims abstract description 234
- 239000005997 Calcium carbide Substances 0.000 title claims abstract description 233
- 238000005516 engineering process Methods 0.000 title abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000002829 reductive effect Effects 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims description 125
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 71
- 239000002817 coal dust Substances 0.000 claims description 71
- 239000001301 oxygen Substances 0.000 claims description 71
- 229910052760 oxygen Inorganic materials 0.000 claims description 71
- 239000007789 gas Substances 0.000 claims description 69
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 46
- 239000003546 flue gas Substances 0.000 claims description 45
- 230000008878 coupling Effects 0.000 claims description 19
- 238000010168 coupling process Methods 0.000 claims description 19
- 238000005859 coupling reaction Methods 0.000 claims description 19
- 238000006722 reduction reaction Methods 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 238000007670 refining Methods 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000004308 accommodation Effects 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 9
- 238000006477 desulfuration reaction Methods 0.000 claims description 8
- 230000023556 desulfurization Effects 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000005261 decarburization Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 20
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000000779 smoke Substances 0.000 abstract description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000003245 coal Substances 0.000 description 14
- 238000010891 electric arc Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 230000009471 action Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 241000196324 Embryophyta Species 0.000 description 9
- 238000009826 distribution Methods 0.000 description 9
- 238000000746 purification Methods 0.000 description 8
- 239000003610 charcoal Substances 0.000 description 7
- -1 calcium carbides Chemical class 0.000 description 6
- 239000000571 coke Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 238000005842 biochemical reaction Methods 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 230000036284 oxygen consumption Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 235000012364 Peperomia pellucida Nutrition 0.000 description 1
- 240000007711 Peperomia pellucida Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a technology and system for combined use of a calcium carbide furnace and a vertical furnace. The system for combined use of the calcium carbide furnace and the vertical furnace comprises the calcium carbide furnace used for preparing calcium carbide and obtaining reducing gas, a purifying device connected with the calcium carbide furnace and used for purifying the reducing gas for conveniently obtaining the clean reducing gas, a heating furnace connected with the purifying device and used for heating the clean reducing gas for conveniently obtaining the high-temperature reducing gas, and the vertical furnace connected with the heating furnace and used for conducting a reducing reaction through the high-temperature reducing gas. Smoke which is high in reducing gas content and generated in the process of preparing the calcium carbide through the calcium carbide furnace can provide heat and a reducing agent for the vertical furnace after being purified and heated, waste is utilized, system investment for preparing the reducing gas is reduced, and the production cost of vertical furnace products is reduced.
Description
Technical field
The present invention relates to field of metallurgy, particularly, relate to technique and the system of furnace of calcium carbide and shaft furnace coupling.
Background technology
Calcium carbide is the main raw material producing ethene, in the industry in occupation of very consequence, it is that furnace charge is sent into electric furnace by pay-off and tremie pipe by a certain proportion of unslaked lime and blue charcoal (coke) mixing that calcium carbide is produced, electric furnace primary structure comprises body of heater and electrode, electric arc is produced after relying on energising during furnace of calcium carbide work, rely on the heat furnace charge that electric arc is formed, furnace charge is made to reach chemical reaction institute heat requirement, wherein, electric arc send region that high temperature can be applied directly in electric arc working district or molten bath, the position in this region below electrode tip until furnace bottom, traditional furnace of calcium carbide, its structure formation is circular three-phase electrode structure, three electrodes are that equilateral triangle is arranged in furnace interior, outside body of heater is circular, this form furnace of calcium carbide structural disadvantages: stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, i.e. non-molten bath zone, the temperature in these places is made not reach reaction requirement, this region furnace charge just can not or be difficult to react, because heat distribution difference is too large, cause furnace of calcium carbide productivity low, power consumption is high, blue charcoal (coke) consumption is relatively large, cost is high.
Shaft furnace is widely used in oxidizing roasting or the direct-reduced iron field of iron ore pellets, for the oxidizing roasting of iron ore pellets or directly pelletizing is reduced to iron in iron and steel metallurgical industry, it is indispensable processing unit in ferrous metallurgy, shaft furnace directly needs a large amount of heats and consumes a large amount of reducing gass in smelting process, increases production cost.
Therefore, the technique reducing shaft furnace production cost requires study.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.For this reason, one object of the present invention is the technique proposing a kind of furnace of calcium carbide and shaft furnace coupling, and this technology utilization furnace of calcium carbide provides heat and reducing gas for shaft furnace, realizes the Appropriate application of the energy.
Thus, according to an aspect of the present invention, the invention provides the technique of a kind of furnace of calcium carbide and shaft furnace coupling.According to embodiments of the invention, this technology utilization furnace of calcium carbide provides reducing gas for shaft furnace, and wherein, described furnace of calcium carbide comprises: body of heater, limits calcium carbide production space in described body of heater; Multiple electrode, described multiple electrode is connected with described body of heater and stretches in described calcium carbide production space; Multiple spray gun, described multiple spray gun is connected with described body of heater and stretches in described calcium carbide production space, and wherein, the method for furnace of calcium carbide and shaft furnace coupling comprises: joined by furnace charge in described calcium carbide production space; The described furnace charge in calcium carbide production space described in described multiple electrode pair is utilized to heat; Described multiple spray gun is utilized to supply coal dust and oxygen in described calcium carbide production space, a part for described coal dust and oxygen generation combustion reactions provide heat to described calcium carbide production space, the remainder of described coal dust as the reductive agent in described furnace charge, to obtain calcium carbide and flue gas; Described flue gas is carried out purifying treatment, to obtain clean reducing gas; The reducing gas of described cleaning is carried out heat treated, to obtain high-temperature reducing gas; And described high-temperature reducing gas is delivered to described shaft furnace, described shaft furnace utilizes described high-temperature reducing gas to carry out reduction reaction.
According to embodiments of the invention, by rationally arranging spray gun at the roof of furnace of calcium carbide body of heater and sidewall, injecting oxygen and coal dust in stove, oxygen and coal dust generation chemical reaction release of heat, heat can be delivered to stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, uniform heat distribution in furnace of calcium carbide; It is low that calcium carbide produces power consumption, in addition, the coal dust sprayed into can also with calcium carbide generation reduction reaction, thus calcium carbide production cost is low, and flue gas turnout is large.In the technique of furnace of calcium carbide of the present invention and shaft furnace coupling, the flue gas that the reducing gas content produced in the process preparing calcium carbide by furnace of calcium carbide of the present invention is high can provide heat and reductive agent for shaft furnace after purification and heating, realize utilization of waste material, this flue gas can provide heat and reductive agent for shaft furnace after purification and heating, save the system investments of preparation reducing gas, reduce the production cost of shaft furnace product.
In addition, the technique of furnace of calcium carbide according to the above embodiment of the present invention and shaft furnace coupling can also have following additional technical characteristic:
According to embodiments of the invention, the ratio of described coal dust and described oxygen is: 1 ton of described coal dust: the described oxygen of (350-800) cubic meter.Thus, coal dust and oxygen carry out oxygen debt formula burning, generate carbon monoxide, provide the reducing atmosphere described in calcium carbide production.
According to embodiments of the invention, the particle diameter of described coal dust is not more than 1mm.Thus, the contact area of coal dust and oxygen is large, is easy to burning.
According to a further aspect in the invention, the invention provides the system of a kind of furnace of calcium carbide and shaft furnace coupling.According to embodiments of the invention, this system comprises: furnace of calcium carbide, for the preparation of calcium carbide, and obtains flue gas, and wherein, described furnace of calcium carbide comprises: body of heater, limits calcium carbide production space in described body of heater; Multiple electrode, described multiple electrode is embedded into described calcium carbide production space from described body of heater; Multiple spray gun, described multiple spray gun is embedded into described calcium carbide production space from the roof of described body of heater and/or sidewall, for providing coal dust and oxygen in described calcium carbide production space, refining plant, described refining plant is connected with described furnace of calcium carbide, for carrying out purifying treatment to described flue gas, to obtain clean reducing gas; Process furnace, described process furnace is connected with described refining plant, for heating the reducing gas of described cleaning, to obtain high-temperature reducing gas; Shaft furnace, described shaft furnace is connected with described process furnace, utilizes described high-temperature reducing gas to carry out reduction reaction.
According to embodiments of the invention, by rationally arranging spray gun between the roof and the electrode of sidewall of furnace of calcium carbide body of heater, injecting oxygen and coal dust in stove, oxygen and coal dust generation chemical reaction release of heat, heat can be delivered to stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, uniform heat distribution in furnace of calcium carbide; It is low that calcium carbide produces power consumption, in addition, the coal dust sprayed into can also with calcium carbide generation reduction reaction, thus, calcium carbide production cost is low, and produce and obtain the high flue gas of reducing gas content, in the system of furnace of calcium carbide of the present invention and shaft furnace coupling, the flue gas that the reducing gas content produced in the process preparing calcium carbide by furnace of calcium carbide of the present invention is high can provide heat and reductive agent for shaft furnace after purification and heating, realize utilization of waste material, save the system investments of preparation reducing gas, reduce the production cost of shaft furnace product.
With reference to figure 3, according to embodiments of the invention, this furnace of calcium carbide 1000 comprises further: spray gun setting device 500, and this spray gun setting device 500 is connected with spray gun 200, is inserted into position in calcium carbide production space 400 for regulating spray gun 200.Thus, the on position of spray gun can be adjusted as required, thus heat can be delivered to stove inside circumference there is a lot of electric arc not act on or the place of the non-constant of action effect, and uniform heat distribution in furnace of calcium carbide, heats more fully to material.
According to embodiments of the invention, each in described multiple spray gun includes: housing, limits spatial accommodation in described housing; Coal dust jet pipe, described coal dust jet pipe is arranged in described spatial accommodation; Multiple oxygen spray pipe, described multiple oxygen spray pipe is arranged in described spatial accommodation, and described multiple oxygen spray pipe distributes along the circumference of described coal dust jet pipe; And cooling water pipeline, described cooling water pipeline is arranged on the outer wall of described housing.Thus, utilize this spray gun, oxygen and coal dust can be provided efficiently in furnace of calcium carbide, and the cooling water pipeline of spray gun outer wall can reduce the temperature of spray gun, prevent in the too high spray gun shortening in work-ing life caused of body of heater internal cause temperature.
According to embodiments of the invention, described spray gun extend into described calcium carbide production space from the roof of described body of heater, and the angle between described spray gun and described furnace of calcium carbide roof is 15 ~ 90 degree.Thus, be convenient to spray gun be inserted in the material on top, furnace of calcium carbide molten bath.
According to embodiments of the invention, described spray gun extend into described calcium carbide production space from the sidewall of described body of heater, and the angle between described spray gun and described furnace of calcium carbide sidewall is 15 ~ 90 degree.Thus, be convenient to spray gun be inserted in the material on top, furnace of calcium carbide molten bath.
According to embodiments of the invention, the spout of described spray gun and the distance of described calcium carbide central axis are the 2/3-5/6 of the radical length of the furnace of calcium carbide at the spout place place of described spray gun.Thus, the oxygen of spray gun ejection and the heat of coal dust firing release have a lot of electric arc not act on stove inside circumference or the place of the non-constant of action effect respectively, ensure that furnace heat is evenly distributed.
The technique of furnace of calcium carbide of the present invention and shaft furnace coupling and system, at least can have one of following advantages:
(1) furnace of calcium carbide furnace heat is evenly distributed.Existing furnace of calcium carbide structure and production technique, the power consumption of ton calcium carbide is about 3100kwh/t. calcium carbide, the high temperature arc light produced by electrode, the region that arc light can not arrive is there is in stove, this region origin of heat mainly relies between furnace charge and conducts heat, and heat transmission is comparatively slow, and thermosteresis is high.The present invention is by arranging spray gun at the top cover of body of heater and/or sidewall, injecting oxygen and coal dust in stove, winding-up process oxygen coal combustion generation heat can be radiated arc light to be difficult to reach position, relatively traditional furnace of calcium carbide, furnace heat distribution is more even, calcium carbide smelting energy consumption is low, and the cycle is short, and the production cost of calcium carbide per ton can reduce by 120 yuan-223 yuan.
(2) utilize furnace of calcium carbide of the present invention to produce calcium carbide, the coal dust that spray gun sprays into can the blue charcoal (or coke) of Substitute For Partial calcium carbide reductive agent, and the consumption of blue charcoal (or coke) reduces, and calcium carbide production cost declines.
(3) process utilizing furnace of calcium carbide of the present invention to produce calcium carbide can combine with shaft kiln directly reduced process, realize duplex to produce, the flue gas that furnace of calcium carbide produces is heated to 850-1000 DEG C send shaft furnace through dedusting, washing, dehumidifying, compression, cleaning and desulfurization decarburization conversion, process furnace, for shaft furnace production provides heat and reductive agent, the flue gas that the furnace of calcium carbide producing 900000 tons of calcium carbides per year produces after treatment, the demand of the reducing gas of the shaft furnace production of 28-36 ten thousand tons of DRI can be met, save the investment of coal reducing gas system, the cost of investment of shaft furnace product DRI significantly reduces.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 shows the structural representation in furnace of calcium carbide longitudinal section according to an embodiment of the invention;
Fig. 2 shows the structural representation of spray gun according to an embodiment of the invention;
Fig. 3 shows the plan structure schematic diagram of spray gun according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, term " longitudinal direction ", " transverse direction ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", the orientation of the instruction such as " end " or position relationship be based on orientation shown in the drawings or position relationship, be only the present invention for convenience of description instead of require that the present invention with specific azimuth configuration and operation, therefore must can not be interpreted as limitation of the present invention.
According to an aspect of the present invention, the invention provides the technique of a kind of furnace of calcium carbide and shaft furnace coupling.With reference to figure 1, according to embodiments of the invention, be described in detail to the technique of furnace of calcium carbide and shaft furnace coupling, this technology utilization furnace of calcium carbide provides heat and reducing gas for shaft furnace.With reference to figure 3, according to embodiments of the invention, furnace of calcium carbide comprises: electrode 100, spray gun 200, body of heater 300, wherein, limits calcium carbide production space in body of heater 300; Multiple electrode 100 is connected with body of heater 300 and stretches in calcium carbide production space 400; Multiple spray gun 200 is connected with body of heater 300 and stretches in calcium carbide production space 400, for providing coal dust and oxygen in calcium carbide production space 400, wherein, a part and the oxygen generation combustion reactions of this coal dust provide heat to calcium carbide production space 400, the remainder of this coal dust, as reductive agent, reduces to calcium carbide.Thus, by rationally arranging spray gun at the roof of furnace of calcium carbide body of heater and sidewall, injecting oxygen and coal dust in stove, oxygen and coal dust generation chemical reaction release of heat, heat can be delivered to stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, uniform heat distribution in furnace of calcium carbide; It is low that calcium carbide produces power consumption, in addition, the coal dust sprayed into can also with calcium carbide generation reduction reaction, thus calcium carbide production cost is low, and produces and obtain the high flue gas of reducing gas content.With reference to figure 1, according to embodiments of the invention, the method for furnace of calcium carbide and shaft furnace coupling comprises:
S100: according to embodiments of the invention, joins furnace charge in described calcium carbide production space.Thus, furnace charge is utilized to start to prepare calcium carbide.
S200: utilize multiple electrode 100 to heat the furnace charge in described calcium carbide production space.Thus, the heat provided by electrode, makes furnace charge react, and generates calcium carbide.
S300: utilize multiple spray gun 200 to supply coal dust and oxygen in calcium carbide production space, a part and the oxygen generation combustion reactions of this coal dust provide heat to calcium carbide production space, the remainder of this coal dust as reductive agent, to obtain calcium carbide and flue gas.Thus, by spray gun to injecting oxygen in stove and coal dust, oxygen and coal dust generation chemical reaction release of heat, heat can be delivered to stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, uniform heat distribution in furnace of calcium carbide; It is low that calcium carbide produces power consumption, in addition, the coal dust sprayed into can also with calcium carbide generation reduction reaction, thus calcium carbide production cost is low, and produces and obtain the high a large amount of flue gases of reducing gas content.
According to some embodiments of the present invention, the ratio of coal dust and oxygen is: 1 ton of coal dust: (350-800) cubic meter oxygen, and wherein, oxygen is the oxygen under standard state.Thus, coal dust and oxygen carry out oxygen debt formula burning, generate a large amount of carbon monoxide, make to be in reducing atmosphere in furnace of calcium carbide, promote that the reduction reaction of calcium carbide is carried out, simultaneously, burning produces heat smoke after dedusting, washing, dehumidifying, compressor compresses, desulfurization and decarburization conversion, process furnace are heated to 800-1000 DEG C, can send into shaft furnace, provide heat and reducing gas for shaft kiln directly reduced, thus make full use of the energy, economic benefit is provided.
According to a particular embodiment of the invention, the particle diameter of coal dust is not more than 1mm.Thus, the contact area of coal dust and oxygen is large, is easy to burning.
S400: flue gas is carried out purifying treatment, obtains clean reducing gas.Thus, remove water vapour, impurity and the non-reducing gas such as carbonic acid gas, sulfurous gas in flue gas, obtain clean reducing gas, be convenient to later use.
S500: the reducing gas of cleaning is carried out heat treated, obtains high-temperature reducing gas.Thus, high-temperature reducing gas can provide sufficient heat for shaft furnace, is convenient to the carrying out of perpendicular reaction in furnace.
S600: high-temperature reducing gas is delivered to shaft furnace, shaft furnace utilizes high-temperature reducing gas to carry out reduction reaction.Thus, the reducing gas produced in the process preparing calcium carbide by furnace of calcium carbide of the present invention can provide heat and reductive agent for shaft furnace after purification and heating, realize utilization of waste material, this reducing gas can provide heat and reductive agent for shaft furnace after purification and heating, save the system investments of preparation reducing gas, reduce the production cost of shaft furnace product.
According to embodiments of the invention, by rationally arranging spray gun at the roof of furnace of calcium carbide body of heater and sidewall, injecting oxygen and coal dust in stove, oxygen and coal dust generation chemical reaction release of heat, heat can be delivered to stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, uniform heat distribution in furnace of calcium carbide; It is low that calcium carbide produces power consumption, in addition, the coal dust sprayed into can also with calcium carbide generation reduction reaction, thus calcium carbide production cost is low, and produces and obtain the high flue gas of reducing gas content.In the technique of furnace of calcium carbide of the present invention and shaft furnace coupling, the flue gas that the reducing gas content produced in the process preparing calcium carbide by furnace of calcium carbide of the present invention is high can provide heat and reductive agent for shaft furnace after purification and heating, realize utilization of waste material, this flue gas can provide heat and reductive agent for shaft furnace after purification and heating, save the system investments of preparation reducing gas, reduce the production cost of shaft furnace product.
According to a further aspect in the invention, the invention provides the system of a kind of furnace of calcium carbide and shaft furnace coupling.With reference to figure 2, according to embodiments of the invention, this system comprises: furnace of calcium carbide 1000, refining plant 2000, process furnace 3000 and shaft furnace 4000.With reference to figure 3, according to embodiments of the invention, furnace of calcium carbide 1000 for the preparation of calcium carbide, and obtains flue gas, and this furnace of calcium carbide comprises: electrode 100, spray gun 200, body of heater 300, wherein, limits calcium carbide production space 400 in body of heater 300; Multiple electrode 100 is connected with body of heater 300 and stretches in calcium carbide production space 400, for providing heat in calcium carbide production space 400; Multiple spray gun 200 is connected with body of heater 300 and stretches in calcium carbide production space 400, for providing coal dust and oxygen in calcium carbide production space 400.According to embodiments of the invention, refining plant 2000 is connected with furnace of calcium carbide 1000, for carrying out purifying treatment to flue gas, obtains clean reducing gas.According to embodiments of the invention, process furnace 3000 is connected with refining plant 2000, for heating the reducing gas of cleaning, obtains high-temperature reducing gas.According to embodiments of the invention, shaft furnace 4000 is connected with process furnace 3000, and shaft furnace 4000 utilizes high-temperature reducing gas to carry out reduction reaction.
According to embodiments of the invention, by rationally arranging spray gun at the roof of furnace of calcium carbide body of heater and sidewall, injecting oxygen and coal dust in stove, oxygen and coal dust generation chemical reaction release of heat, heat can be delivered to stove inside circumference has a lot of electric arc not act on or the place of the non-constant of action effect, uniform heat distribution in furnace of calcium carbide; It is low that calcium carbide produces power consumption, in addition, the coal dust sprayed into can also with calcium carbide generation reduction reaction, thus, calcium carbide production cost is low, and produce and obtain the high flue gas of reducing gas content, in the system of furnace of calcium carbide of the present invention and shaft furnace coupling, the flue gas that the reducing gas content produced in the process preparing calcium carbide by furnace of calcium carbide of the present invention is high can provide heat and reductive agent for shaft furnace after purification and heating, realize utilization of waste material, save the system investments of preparation reducing gas, reduce the production cost of shaft furnace product.
According to some embodiments of the present invention, this furnace of calcium carbide comprises further: setting device, (setting device and spray gun can be man-to-man relations for this setting device and multiple spray gun, also can a setting device be connected with multiple spray gun) be connected, be inserted into position in described calcium carbide production space for regulating described spray gun.Thus, can according to the position of material and molten bath, adjustment spray gun on position, to make bottom spray gun between top, molten bath and solid materials.
According to a particular embodiment of the invention, each spray gun includes: housing, and coal dust jet pipe, oxygen spray pipe and cooling water pipeline wherein, limit spatial accommodation in housing; Coal dust jet pipe is arranged in this spatial accommodation; Multiple oxygen spray pipe is arranged in this spatial accommodation, and oxygen spray pipe distributes along the circumference of coal dust jet pipe; Cooling water pipeline is arranged on the outer wall of housing, wherein, cooling water pipeline can be wrapped on the outer wall of housing in snakelike, comprise inlet segment and backwater section, water coolant flow to the other end from the inlet segment along pipeline from one end of housing, arrive the top of inlet segment, then return along the backwater section of this pipeline, final outflow conduit.
According to some embodiments of the present invention, spray gun is positioned on the sidewall of body of heater, and the spout of spray gun is positioned at solid charge district, does not stretch in the district of molten bath.Thus, the heat that the coal dust firing of spray gun ejection produces fully heats material, and increases the contact of coal dust and material, promotes that coal dust and material reaction generate calcium carbide, thus reduce the consumption of coke and blue charcoal in calcium carbide production, production cost is low.
According to embodiments of the invention, coal dust jet pipe in spray gun is connected by pipeline with high pressure coal filler bin, oxygen spray pipe is connected by high pressure oxygen pipeline with oxygen pressing station, the leading portion of spray gun arranges valve, when jetting in stove, pulverized coal channel, oxygen channel and valve open, coal dust/oxygen enters spray gun, and in the spout and stove of spray gun, following chemical reaction occurs:
C+O
2＝CO+Q(1)
A small amount of C+O
2=CO
2+ Q (2)
C+CaO＝CaC
2+CO(3)
Wherein, formula (1) and formula (2) are thermopositive reaction, release heat for heating furnace charge to reduce power consumption.Part charcoal in coal dust and calcium oxide generation reduction reaction, blue charcoal (coke) usage quantity can be reduced, and, burning produces heat smoke after dedusting, washing, dehumidifying, compressor compresses, desulfurization and decarburization conversion, process furnace are heated to 800-1000 DEG C, shaft furnace can be sent into, there is provided heat and reducing gas for shaft kiln directly reduced, thus make full use of the energy, increase economic efficiency.In addition, because calcium carbide in-furnace temperature is very high, the cooling water pipeline of spray gun outer wall can reduce the temperature of spray gun, prevents the too high spray gun shortening in work-ing life caused of temperature in body of heater.
According to some embodiments of the present invention, spray gun extend into calcium carbide production space 400 from the roof of body of heater 300, and the angle between spray gun 200 and furnace of calcium carbide 300 roof is 15 ~ 90 degree.Thus, be convenient to the angle of the distributing position adjustment spray gun according to material in stove and electrode, ensure that spray gun inserts in the middle part of the material on top, furnace of calcium carbide molten bath, and not with molten bath contact.
According to some embodiments of the present invention, spray gun 200 extend into calcium carbide production space 400 from the sidewall of body of heater 300, and the angle between spray gun 200 and furnace of calcium carbide 300 sidewall is 15 ~ 90 degree, be convenient to the angle of the distributing position adjustment spray gun according to material in stove and electrode, ensure spray gun insert top, furnace of calcium carbide molten bath material in the middle part of, and not with molten bath contact.
According to some embodiments of the present invention, the distance of the spout of spray gun 200 and the central axis of furnace of calcium carbide 1000 is the 2/3-5/6 of the radical length of the furnace of calcium carbide at the spout place place of spray gun 200.Wherein, radical length refers to and extends radially outward length to the radial line segments crossing with sidewall from medullary ray, and the radical length at spout place place refers to the length of the radial line segments at spout place.Thus, the oxygen of spray gun ejection and the heat of coal dust firing release have a lot of electric arc not act on stove inside circumference or the place of the non-constant of action effect respectively, ensure that furnace heat is evenly distributed.
According to embodiments of the invention, refining plant 2000 can comprise: gas water scrubber 2100, moisture trap 2200, compressor 2300 and desulfurization and decarburization umformer 2400.Thus utilize aforesaid device to wash reducing gas, except water vapour, pressurization and desulfurization decarbonisation, remove the impurity in flue gas and the non-reducing gas such as carbonic acid gas, sulfurous gas, the ratio of reducing gas in the component of flue gas is significantly increased, obtain clean reducing gas, prevent the dust occluding device pipeline in reducing gas, affect the normal operation of equipment pipe.
Below with reference to specific embodiment, the present invention will be described, it should be noted that, these embodiments are only illustrative, and can not be interpreted as limitation of the present invention.
Embodiment 1:
With a furnace of calcium carbide for spray gun, comprise bell, gun body, spray gun lifting gear, insulated enclosure cover.Described furnace of calcium carbide is the furnace of calcium carbide that bell is provided with spray gun, and spray gun is copper spray gun.In the present embodiment, spray gun structure as shown in Figure 2, spray gun inside is provided with jetting oxygen tube, coal powder jetting tube and water-cooled tube, jetting oxygen tube/coal powder jetting tube is connected with external oxygen pipeline/high pressure coal dust transfer lime, pipe connecting is equipped with control valve, when carrying out oxygen coal to furnace of calcium carbide and mixing spray, open by-pass valve control control pressure and flow.Spray gun water-cooled tube is connected with high pressure clean circulating water pipe, makes water coolant Rapid Circulation in spray gun, guarantees inflow temperature <35 DEG C, leaving water temperature(LWT) <50 DEG C.Spray gun is connected with lifting gear, spray gun can be regulated to enter stove position according to melt pool height and work loading height.Be heated more evenly to make furnace of calcium carbide furnace charge and calorific loss reduces, calcium carbide furnace cover spray gun is evenly arranged in outside electrode concentric(al) circles, perforate direction and horizontal plane, and spray gun arranges insulating sealing materials with calcium carbide bell or furnace wall, prevents from conducting electricity and altering outside flue gas.When calcium carbide smelted by this device furnace of calcium carbide, large calorimetric is released in the biochemical reaction of the mixed eruption of oxygen coal, can Substitute For Partial electric energy, reduction power consumption; Heat can be delivered to the non-molten bath zone that arclight is difficult to arrive simultaneously, and calcium carbide furnace heat is more even, reduces calcium carbide tap to tap time and energy consumption.
When calcium carbide furnace charge loads in furnace of calcium carbide, adjustment electrode and spray gun, make the spout of spray gun insert the furnace charge pars intermedia on top, molten bath, the power transmission starting the arc, opens spray gun early gate simultaneously, carries out oxygen coal mixed injection, and winding-up pulverized anthracite 130kg/t. calcium carbide, oxygen consumption are 95NM
3/ t. calcium carbide, is heated to 2000-2200 DEG C and smelts by bath temperature.Tradition calcium carbide produces the about 3100kwh/t. calcium carbide of power consumption, and after calcium carbide prepared by use furnace of calcium carbide of the present invention, power consumption is reduced to 2600kwh/t. calcium carbide, production cost reduces by 165 yuan/t. calcium carbide, meanwhile, coal dust and oxygen reaction generate a large amount of CO, make exhaust gas volumn increase about 210Nm
3/ t. calcium carbide, total exhaust gas volumn is about 650NM
3/ t.Flue gas is passed into refining plant and carry out dedusting, washing, dehumidifying, compression, cleaning and desulfurization decarburization conversion process, obtain clean flue gas, the flue gas of cleaning is passed in process furnace and is heated to 850-1000 DEG C, obtain high-temperature flue gas.High-temperature flue gas is passed into shaft furnace, and shaft furnace utilizes high-temperature flue gas to reduce to ferric oxide, obtains iron.Usually, the flue gas that the furnace of calcium carbide producing 900000 tons of calcium carbides per year produces can meet the demand of the reducing gas of the DRI shaft furnace production of annual output 300000 tons substantially.
Embodiment 2:
With a furnace of calcium carbide for spray gun, comprise bell, gun body, spray gun lifting gear, insulated enclosure cover.Described furnace of calcium carbide is the furnace of calcium carbide that bell is provided with spray gun, and spray gun is copper spray gun.In the present embodiment, spray gun structure as shown in Figure 2, spray gun inside is provided with jetting oxygen tube, coal powder jetting tube and water-cooled tube, jetting oxygen tube/coal powder jetting tube is connected with external oxygen pipeline/high pressure coal dust transfer lime, pipe connecting is equipped with control valve, when carrying out oxygen coal to furnace of calcium carbide and mixing spray, open by-pass valve control control pressure and flow.Spray gun water-cooled tube is connected with high pressure clean circulating water pipe, makes water coolant Rapid Circulation in spray gun, guarantees inflow temperature <35 DEG C, leaving water temperature(LWT) <50 DEG C.Spray gun is connected with lifting gear, spray gun can be regulated to enter stove position according to melt pool height and work loading height.Be heated more evenly and calorific loss minimizing to make furnace of calcium carbide furnace charge, furnace of calcium carbide installs copper spray gun in the perforate of furnace of calcium carbide furnace wall, furnace wall tapping is positioned at top, furnace of calcium carbide molten bath, perforate direction becomes 35 ° with horizontal plane, spray gun and calcium carbide bell or furnace wall arrange insulating sealing materials, prevent from altering outside conduction and flue gas.When calcium carbide smelted by this device furnace of calcium carbide, large calorimetric is released in the biochemical reaction of the mixed eruption of oxygen coal, can Substitute For Partial electric energy, reduction power consumption; Heat can be delivered to the non-molten bath zone that arclight is difficult to arrive simultaneously, and calcium carbide furnace heat is more even, reduces calcium carbide tap to tap time and energy consumption.
When calcium carbide furnace charge loads in furnace of calcium carbide, adjustment electrode and spray gun, make the spout of spray gun insert the furnace charge pars intermedia on top, molten bath, the power transmission starting the arc, opens spray gun early gate simultaneously, carries out oxygen coal mixed injection, and winding-up pulverized anthracite 200kg/t. calcium carbide, oxygen consumption are 145NM
3/ t. calcium carbide, is heated to 2000-2200 DEG C and smelts by bath temperature.Tradition calcium carbide produces the about 3100kwh/t. calcium carbide of power consumption, and after calcium carbide prepared by use furnace of calcium carbide of the present invention, power consumption is reduced to 2500kwh/t. calcium carbide, production cost reduces by 233 yuan/t. calcium carbide, meanwhile, coal dust and oxygen reaction generate a large amount of CO, make CO exhaust gas volumn increase about 350Nm
3/ t. calcium carbide, total exhaust gas volumn is about 800NM
3/ t.Flue gas is passed into refining plant and carry out dedusting, washing, dehumidifying, compression, cleaning and desulfurization decarburization conversion process, obtain clean flue gas, the flue gas of cleaning is passed in process furnace and is heated to 850-1000 DEG C, obtain high-temperature flue gas.High-temperature flue gas is passed into shaft furnace, and shaft furnace utilizes high-temperature flue gas to reduce to ferric oxide, obtains iron.Usually, the flue gas that the furnace of calcium carbide producing 900000 tons of calcium carbides per year produces can meet the demand of the reducing gas of direct-reduced iron (DRI) shaft furnace production of annual output 380000 tons substantially.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (10)
1. a technique for furnace of calcium carbide and shaft furnace coupling, is characterized in that, utilizes furnace of calcium carbide to provide reducing gas for shaft furnace,
Wherein, described furnace of calcium carbide comprises:
Body of heater, limits calcium carbide production space in described body of heater;
Multiple electrode, described multiple electrode is connected with described body of heater and stretches in described calcium carbide production space;
Multiple spray gun, described multiple spray gun is connected with described body of heater and stretches in described calcium carbide production space,
Wherein, the technique of described furnace of calcium carbide and described shaft furnace coupling comprises:
Furnace charge is joined in described calcium carbide production space;
The described furnace charge in calcium carbide production space described in described multiple electrode pair is utilized to heat;
Described multiple spray gun is utilized to supply coal dust and oxygen in described calcium carbide production space, a part and the described oxygen generation combustion reactions of described coal dust provide heat to described calcium carbide production space, the remainder of described coal dust as the reductive agent in described furnace charge, to obtain calcium carbide and flue gas;
Described flue gas is carried out purifying treatment, to obtain clean reducing gas;
The reducing gas of described cleaning is carried out heat treated, to obtain high-temperature reducing gas; And
Described high-temperature reducing gas is delivered to described shaft furnace, and described shaft furnace utilizes described high temperature reduction gas to carry out reduction reaction.
2. technique according to claim 1, is characterized in that, the ratio of described coal dust and described oxygen is: 1 ton of described coal dust: the described oxygen of (350-800) cubic meter.
3. technique according to claim 1, is characterized in that, the particle diameter of described coal dust is not more than 1mm.
4. a system for furnace of calcium carbide and shaft furnace coupling, is characterized in that, comprising:
Furnace of calcium carbide, for the preparation of calcium carbide, and obtains flue gas, and wherein, described furnace of calcium carbide comprises body of heater, limits calcium carbide production space in described body of heater; Multiple electrode, described multiple electrode is embedded into described calcium carbide production space from described body of heater; Multiple spray gun, described multiple spray gun is embedded into described calcium carbide production space, for providing coal dust and oxygen in described calcium carbide production space from the roof of described body of heater and/or sidewall;
Refining plant, described refining plant is connected with described furnace of calcium carbide, for carrying out purifying treatment to described flue gas, to obtain clean reducing gas;
Process furnace, described process furnace is connected with described refining plant, for heating the reducing gas of described cleaning, to obtain high-temperature reducing gas;
Shaft furnace, described shaft furnace is connected with described process furnace, utilizes described high-temperature reducing gas to carry out reduction reaction.
5. system according to claim 4, is characterized in that, described furnace of calcium carbide comprises further:
Spray gun setting device, described spray gun setting device is connected with described spray gun, for the position and the angle that regulate described coal dust and oxygen to enter described calcium carbide production space.
6. system according to claim 4, is characterized in that, each in described multiple spray gun includes:
Housing, limits spatial accommodation in described housing;
Coal dust jet pipe, described coal dust jet pipe is arranged in described spatial accommodation;
Multiple oxygen spray pipe, described multiple oxygen spray pipe is arranged in described spatial accommodation, and described multiple oxygen spray pipe distributes along the circumference of described coal dust jet pipe; And
Cooling water pipeline, described cooling water pipeline is arranged on the outer wall of described housing.
7. system according to claim 4, is characterized in that, described spray gun extend into described calcium carbide production space from the roof of described body of heater, and the angle between described spray gun and described furnace of calcium carbide roof is 15 ~ 90 degree.
8. system according to claim 4, is characterized in that, described spray gun extend into described calcium carbide production space from the sidewall of described body of heater, and the angle between described spray gun and described furnace of calcium carbide sidewall is 15 ~ 90 degree.
9. system according to claim 4, is characterized in that, the spout of described spray gun and the distance of described calcium carbide central axis are the 2/3-5/6 of the radical length of the furnace of calcium carbide at the spout place place of described spray gun.
10. system according to claim 4, is characterized in that, described refining plant comprises gas water scrubber, moisture trap, compressor and desulfurization and decarburization umformer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105647588A (en) * | 2016-03-17 | 2016-06-08 | 江苏省冶金设计院有限公司 | Calcium carbide furnace and shaft furnace combined system |
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| CN103708462A (en) * | 2013-12-25 | 2014-04-09 | 北京神雾环境能源科技集团股份有限公司 | Method for preparing calcium carbide |
| CN204917989U (en) * | 2015-07-24 | 2015-12-30 | 北京神雾环境能源科技集团股份有限公司 | System for carbide stove and shaft furnace ally oneself with to be used |
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Patent Citations (4)
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| CN101830464A (en) * | 2010-05-14 | 2010-09-15 | 山西亿众公用事业有限公司 | Technique for producing calcium carbide and cogeneration by two-stage method and device thereof |
| CN103408013A (en) * | 2013-08-03 | 2013-11-27 | 石家庄新华能源环保科技股份有限公司 | Calcium carbide furnace with combination of oxygen heating method and electric heating method |
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| CN204917989U (en) * | 2015-07-24 | 2015-12-30 | 北京神雾环境能源科技集团股份有限公司 | System for carbide stove and shaft furnace ally oneself with to be used |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105647588A (en) * | 2016-03-17 | 2016-06-08 | 江苏省冶金设计院有限公司 | Calcium carbide furnace and shaft furnace combined system |
| CN105647588B (en) * | 2016-03-17 | 2018-12-04 | 江苏省冶金设计院有限公司 | System associated with furnace of calcium carbide and shaft furnace |
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