CN103105058A - Rotary kiln combustion system utilizing low heating value coal gas - Google Patents
Rotary kiln combustion system utilizing low heating value coal gas Download PDFInfo
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- CN103105058A CN103105058A CN2011103589175A CN201110358917A CN103105058A CN 103105058 A CN103105058 A CN 103105058A CN 2011103589175 A CN2011103589175 A CN 2011103589175A CN 201110358917 A CN201110358917 A CN 201110358917A CN 103105058 A CN103105058 A CN 103105058A
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Abstract
The invention relates to a rotary kiln combustion system utilizing low heating value coal gas and belongs to the technical field of industrial furnace smoke waste-heat utilization. The rotary kiln combustion system utilizing the low heating value gas is characterized by comprising a metal heat exchanger (1) which is used for preheating coal gas, or the metal heat exchanger (1) and a metal heat exchanger (2), wherein the metal heat exchanger (1) is used for preheating the gas and the metal heat exchanger (2) which is used for preheating the primary air, a burning mouth (3), a rotary kiln (4), a material-sliding gas hood (5), a furnace burden preheater (6), a dust remover (7), a primary air fan (12) and the like. The high-temperature gas from a rotary kiln is divided into two paths or three paths to respectively preheat furnace burden and burning medium. The rotary kiln combustion system utilizing the low heating value coal gas has the advantages of replacing high heating value fuel by cheap coal gas and reducing cost and energy consumption of products. The rotary kiln combustion system utilizing the low heating value coal gas is wide in application prospect for energy conservation technology transformation of rotary process and rotary kiln processes of roasting, calcining, solid reduction, mineral aggregate and the like.
Description
1. technical field
A kind of rotary kiln combustion system of utilizing low-heat value gas, relate to the industrial furnace fume afterheat and utilize technical field, be mainly used in the industries such as building materials, chemical industry, iron and steel industry and non-ferrous metal metallurgy, the techniques such as the rotary kiln baking of piece granular material, calcining, solid reduction smelting and mineral aggregate pretreatment, and the energy saving technical reconstruction of rotary kiln technology.
2. background technology
From Chinese patented technology, near field invention and utility model patent retrieval situation, the background technology situation is as follows.
In November, 1996 is applied for what disclosed Li Jun of in May, 1998 peak was invented at the Li Jun peak, and a kind of combustion system for cement rotary kiln, be a kind of facility that utilizes cement to who knows the cooler warm-up combustion-supporting air; Application Shenyang Aluminium Magnesium Design & Research Inst in August, 2007, in inventions such as state friend Wang Zhongxin, a kind of dolomite calcination heat-recovering method and system (2009.3.4 bulletin), proposition be a kind of method for the waste heat recovery of rotary kiln end product; Jiangsu University's application, Zhang Xiliang, Mao Cuiyun, Feng like neoteric, pellet production equipment waste heat inner-outer circulation comprehensive recycling method and hot air flow system thereof (application number 200910031988.7), proposition be that a kind of iron baking rotary kiln fume afterheat is received back and forth with drying grate preheating furnace charge; The precious bright application design of Binzhou, Shandong Province dan, new type nonaqueous cement rotary kiln burner primary air utilizes afterheat energy-saving device (utility model application number 201020510790.5), proposes to utilize clinker cooler low-temperature zone cooling air as an air blast air inducing; The application of the Shandong of bulletin roc industry and trade difficult to understand Co., Ltd, the calcination system of energy-saving rotary kiln (utility model application number 200920227150.0) of the design such as Li Junyuan, Yang Weizhen, announced a kind of calcined by rotary kiln system of utilizing economizer bank preheating furnace charge in June, 2010.Above-mentioned patent does not all relate to take rotary kiln technology or the rotary kiln combustion system that low-heat value gas is fuel.
Zhongye Coke Resistance Engineering Technology Co., Ltd's in September, 2006 application, the low heat value gas oxygen-enriched burning process in rotary lime kiln of the invention such as Yang Geng peach king turbulent waves, proposed to mix pure oxygen in combustion air and utilized low-heat value gas as rotary kiln fuel.Although " low heat value gas oxygen-enriched burning process in rotary lime kiln " of Zhongye Coke Resistance Engineering Technology Co., Ltd proposed to do with low-heat value gas the fuel of lime rotary kiln is feasible technically, really be a kind of effective ways that reduce the combustion product gases volume, but there is following problems, one, below 25%, be not more than 2000 * 4.18kJ/Nm at the oxygen enrichment degree
3the coal gas of calorific capacity, what the rotary kiln exhaust gas temperature can be than higher calorific value fuel turnaround kiln is much higher, and kiln tail material preheater thermal balance is difficult to guarantee, and the flue-gas temperature that enters deduster can be too high.In conventional production, to increase the amount of being blended into of cold wind, this can cause again dedusting smoke evacuation system machine utilization excessive.Two, industrial oxygen cost of manufacture is high, from economically far away less than free air.Three, industrial oxygen belongs to the high energy consumption product, and the working medium energy consumption is up to 0.4kgce/m
3, the reduction of product sequence energy consumption has been played to negative impact.Four, to (2000～2500) * 4.18kJ/Nm
3the coal gas of calorific capacity scope, do not have situation more than needed to industrial oxygen, and the gas oxygen-enriched burning of rotary kiln technology has sizable limitation.This patent intention is avoided and is addressed the above problem.
From domestic and foreign literature data-searching, although, with the metallic recuperator Mist heat recovering, with combustion medium preheater and the combustion medium preheater of preheated burning medium, on the industrial furnace flue system of many techniques, by wide sending out, applied, but, aspect two of rotary kiln combustion system and rotary kiln technology configurations, but also do not have.Tracing it to its cause, may be that low-heat value gas reclaims and the manufacturing technology progress causes the decline of low-heat value gas calorific capacity, fuel to appreciate and rotary kiln burning condition uniqueness.This patent attempts to fill up above-mentioned technological gap.
From the domestic production present situation, in piece granular material rotary kiln baking or calcining or solid reduction smelting process, only be confined to utilize material preheater (6) to carry out the waste heat recovery of rotary kiln exit gas.Material preheater (6) comprises, early stage cement produced with the dry method calcining and lime calcining drying grate, cement dilute phase fludization preheater now and lime calcining shaft preheater.The rotary kiln technology of the industries such as many building materials, pottery, chemical industry, metallurgical particularly nonferrous metallurgy, only rest on, and utilizes on the steam product of rotary kiln exit gas output low parameter, poor efficiency.What have even also sprays water or blowing in employing, indirectly to cool back the rotary kiln flue gas.Calcined by rotary kiln, roasting or solid state reduction technique, general kiln temperature is all more than 1200 ℃.The rotary kiln combustion system need to adopt the fuel as high heating values such as coal dust, coke powder, coke-stove gas, natural gases.Minority need so adopt low-calorie fuel, but still mix, has burnt a large amount of exotic fuels, and even not stinting of having allocated raw coal, petroleum coke or the coke powder of high heating value into exceeding the reducing agent consumption in furnace charge.
Current energy crisis, caused the fuel applications situation of following rotary kiln technology: expensive fuel oil is applied to the rotary kiln combustion system, in China, substantially bans; The price of high heating value high-quality coal is in quick rise, and supplies unstable; The high heating value gas price goes up fast and supplies limited.In order to avoid ature of coal, constantly descend, ash content constantly increases, and has a strong impact on the problems such as the required calcining completed of rotary kiln, roasting or solid state reduction technique, and the trend that poor gas is changed into to low-heat value gas is arranged greatly.With steel mill, reclaim as the low-heat value gas such as blast furnace gas, coal gas of converter, the vaporising fuel of high ash content colm, more and more have cheap economic advantages.The burning feature of these low-heat value gas is: the requirement of combustion medium preheat temperature is high, the exhaust gas volumn of unit product output is large, the combustion air requirement is also large.
Select trend in order to adapt to this fuel of low-heat value gas, solve above-mentioned technical barrier, inventor herein person directly turns back to the basic ideas of energy-saving of rotary kiln itself in line with recovery rotary kiln fume afterheat, utilize furnace charge, coal gas, the air preheat equipment of prior art maturation to design novel rotary kiln energy saving technique and rotary kiln combustion system technical scheme---a kind of rotary kiln combustion system of utilizing low-heat value gas.
3. summary of the invention
A kind of rotary kiln combustion system of utilizing low-heat value gas, its basic technical features is, it is by the metallic recuperator (1) of preheating gas, or the metallic recuperator of preheating primary air (2), or the metallic recuperator (2) of the metallic recuperator of preheating gas (1) and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 roads or 3 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas or the metallic recuperator (2) of preheating primary air, perhaps there is the 3rd tunnel to enter with the second tunnel and form the metallic recuperator (2) of preheating primary air of two preheated burning media or the metallic recuperator (1) of preheating gas, finally lump enters deduster (7) again.Slipping slightly variant at industry-by-industry of material petticoat pipe (5), as the rotary kiln lime calcining is called transfer slide, is charge pipe and expansion chamber at the rotary kiln baking of nonferrous smelting industry.Material preheater (6), comprise shaft preheater, chain grate machine, perpendicular Tong, whirlwind, suspension, ebullated dryer etc.Deduster (7) comprises, cyclone dust collectors, sack cleaner, electrostatic precipitator, spraying semidry method deduster, all kinds of alkali hydrofilters that add, and combination.
A kind of rotary kiln combustion system of utilizing low-heat value gas with above-mentioned basic technical features, its technical characterictic is, metallic recuperator (1) and burner (3) by preheating gas, rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium coal gas respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).Material preheater (6) comprises, shaft cooler, chain grate cooler, cylinder cooler etc.
A kind of rotary kiln combustion system of utilizing low-heat value gas with above-mentioned basic technical features, its technical characterictic is, metallic recuperator (2) and burner (3) by the preheating primary air, rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium primary air respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (2) of preheating primary air, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).
A kind of rotary kiln combustion system of utilizing low-heat value gas with above-mentioned basic technical features, its technical characterictic is, by the metallic recuperator (2) of the metallic recuperator (1) of preheating gas and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 3 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas, the 3rd tunnel enters the metallic recuperator (2) that forms the preheating primary air of two preheated burning media with the second tunnel, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).
A kind of rotary kiln combustion system of utilizing low-heat value gas with above-mentioned basic technical features, its technical characterictic is, metallic recuperator (2) by the preheating primary air is connected with the metallic recuperator (1) of preheating gas, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (2) of preheating primary air, then enter the metallic recuperator (1) of the preheating gas of arranged in series, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).
A kind of rotary kiln combustion system of utilizing low-heat value gas with above-mentioned all technical characteristic, its technical characterictic is, the metallic recuperator of preheating gas (1), or the metallic recuperator of preheating primary air (2), or the metallic recuperator (2) of the metallic recuperator of preheating gas (1) and preheating primary air simultaneously, be connected between the gas approach of the exhaust opening of rotary kiln (4) and stock column that flue gas enters material preheater (6) or material bed the position of the duct arrangement that is convenient to arbitrarily to smoke.
4. accompanying drawing explanation
Accompanying drawing 1: a kind of rotary kiln combustion system invention part block diagram that utilizes low-heat value gas.Thick line box indicating equipment in figure, dashed rectangle means material or medium, and solid line and arrow thereof mean combustion medium (coal gas, air) or flue gas flow, and dotted line and arrow thereof mean furnace charge (material) flow process.In dashed rectangle, the implication of digitized representation is respectively:
101one cooled coal gas,
102coal gas after one preheating,
201-primary air, after 202 1 preheatings-inferior air,
302auxiliary air after-preheating,
401-rotary kiln is discharged flue gas,
402-material preheater is discharged flue gas,
403the second road flue gas that-rotary kiln is extracted out,
404the second road flue gas after-preheating gas,
405the Third Road flue gas that-rotary kiln is extracted out,
406flue gas after-preheating primary air,
501-furnace charge,
502furnace charge after-preheating,
503-rotary kiln hot product.In the thick line square frame, the implication of digitized representation is respectively: 1-combustion medium preheater (1), and 3-coal gas burner (3), 4-rotary kiln (4), 5-kiln tail slips expects petticoat pipe (5), 6-material preheater (6), 7-deduster (7).
Accompanying drawing 2: a kind of rotary kiln combustion system block diagram that utilizes low-heat value gas of preheating furnace charge in parallel and coal gas.Thick line box indicating equipment in figure, dashed rectangle means material or medium, and solid line and arrow thereof mean combustion medium (coal gas, air) or flue gas flow, and dotted line and arrow thereof mean furnace charge (material) flow process.In dashed rectangle, the implication of digitized representation is respectively: 101 1 cooled coal gas, the coal gas after the 102-preheating, 201-primary air, the 301-auxiliary air, auxiliary air after the 302-preheating, the 401-rotary kiln is discharged flue gas, and the 402-material preheater is discharged flue gas, the second road flue gas that the 403-rotary kiln is extracted out, the second road flue gas after 404 1 preheating gas, 501-furnace charge, the furnace charge after the 502-preheating, 503-rotary kiln hot product, the cooling rear product of 504-.In the thick line square frame, the implication of digitized representation is respectively: 1-combustion medium preheater (1), 3-coal gas burner (3), 4-rotary kiln (4), 5-kiln tail slips expects petticoat pipe (5), 6-material preheater (6), 7-deduster (7), the 8-air-introduced machine, the 9-chimney, 10-reactor product cooler, 11-overfire air fan.
Accompanying drawing 3: a kind of rotary kiln combustion system block diagram that utilizes low-heat value gas of preheating furnace charge in parallel and primary air.Thick line box indicating equipment in figure, dashed rectangle means material or medium, and solid line and arrow thereof mean combustion medium (coal gas, air) or flue gas flow, and dotted line and arrow thereof mean furnace charge (material) flow process.In dashed rectangle, the implication of digitized representation is respectively:
101-cooled coal gas,
201-primary air,
202primary air after-preheating,
301-auxiliary air,
302auxiliary air after-preheating,
401-rotary kiln is discharged flue gas,
402-material preheater is discharged flue gas,
403the second road flue gas that-rotary kiln is extracted out,
406flue gas after-preheating primary air,
501-furnace charge,
502furnace charge after-preheating,
503-rotary kiln hot product,
504-cooling rear product.In the thick line square frame, the implication of digitized representation is respectively: 2-combustion medium preheater (2), 3-coal gas burner (3), 4-rotary kiln (4), 5-kiln tail slips expects petticoat pipe (5), 6-material preheater (6), 7-deduster (7), the 8-air-introduced machine, 9-chimney, 10-reactor product cooler, the 11-overfire air fan, the 12-primary air fan.
Accompanying drawing 4: a kind of rotary kiln combustion system block diagram that utilizes low-heat value gas of preheating furnace charge in parallel, coal gas and primary air.Thick line box indicating equipment in figure, dashed rectangle means material or medium, and solid line and arrow thereof mean combustion medium (coal gas, air) or flue gas flow, and dotted line and arrow thereof mean furnace charge (material) flow process.In dashed rectangle, the implication of digitized representation is respectively:
101-cooled coal gas,
102coal gas after-preheating,
201-primary air,
202primary air after-preheating,
301-auxiliary air,
302auxiliary air after-preheating,
401-rotary kiln is discharged flue gas,
402-material preheater is discharged flue gas,
403the second road flue gas that-rotary kiln is extracted out,
404the second road flue gas after-preheating gas,
405the Third Road flue gas that-rotary kiln is extracted out,
406-flue gas after preheating-inferior air,
501-furnace charge,
502furnace charge after-preheating,
503-rotary kiln hot product,
504-cooling rear product.In the thick line square frame, the implication of digitized representation is respectively: 1-combustion medium preheater (1), 2-combustion medium preheater (2), 3-coal gas burner (3), 4-rotary kiln (4), 5-kiln tail slips expects petticoat pipe (5), 6-material preheater (6), 7-deduster (7), 8-air-introduced machine, the 9-chimney, the 10-reactor product cooler, 11-overfire air fan, 12-primary air fan.
Accompanying drawing 5: a kind of rotary kiln combustion system block diagram that utilizes low-heat value gas of preheating furnace charge in parallel, series connection preheated burning medium.Thick line box indicating equipment in figure, dashed rectangle means material or medium, and solid line and arrow thereof mean combustion medium (coal gas, air) or flue gas flow, and dotted line and arrow thereof mean furnace charge (material) flow process.In dashed rectangle, the implication of digitized representation is respectively:
101-cooled coal gas,
102coal gas after-preheating,
201-primary air, the primary air after the 202-preheating,
301-auxiliary air,
302auxiliary air after-preheating,
401-rotary kiln is discharged flue gas,
402-material preheater is discharged flue gas,
403the second road flue gas that-rotary kiln is extracted out,
404the second road flue gas after-(series connection) preheating (primary air with) coal gas,
501-furnace charge,
502furnace charge after-preheating,
503-rotary kiln hot product,
504-cooling rear product.In the thick line square frame, the implication of digitized representation is respectively: 1-combustion medium preheater (1), 2-combustion medium preheater (2), 3-coal gas burner (3), 4-rotary kiln (4), 5-kiln tail slips expects petticoat pipe (5), 6-material preheater (6), 7-deduster (7), 8-air-introduced machine, the 9-chimney, the 10-reactor product cooler, 11-overfire air fan, 12-primary air fan.
5. the specific embodiment
A kind of essential characteristic part of utilizing the rotary kiln combustion system of low-heat value gas, metallic recuperator (1) by preheating gas, or the metallic recuperator of preheating primary air (2), or the metallic recuperator (2) of the metallic recuperator of preheating gas (1) and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 roads or 3 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas or the metallic recuperator (2) of preheating primary air, perhaps there is the 3rd tunnel to enter with the second tunnel and form the metallic recuperator (2) of preheating primary air of two preheated burning media or the metallic recuperator (1) of preheating gas, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, enter Atmospheric Diffusion by air-introduced machine from smoke stack emission.From the metallic recuperator (1) of preheating gas out, or from the metallic recuperator (2) of preheating primary air out, or simultaneously from the metallic recuperator (1) of preheating gas and metallic recuperator (2) heating gas out of preheating primary air, enter burner (3), spray into after mixing in rotary kiln and form combustion flame, entrainment the auxiliary air of preheating, in the heat release of rotary kiln internal combustion, the output flue gas is discharged and is entered flue system from the afterbody of rotary kiln (4).
According to above-mentioned a kind of distinct device configuration mode that utilizes the rotary kiln combustion system of low-heat value gas, can be designed to a kind of rotary kiln combustion system of utilizing low-heat value gas of various ways, now contrast accompanying drawing and further illustrate as follows.
A kind of rotary kiln combustion system of utilizing low-heat value gas of embodiment 1-preheating furnace charge in parallel and coal gas
As shown in Figure 2, be a kind of rotary kiln combustion system of utilizing low-heat value gas of preheating furnace charge in parallel and coal gas.It is formed with burner (3), rotary kiln (4), the equipment configurations such as material petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), primary air fan (12) of slipping by the metallic recuperator (1) of preheating gas, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium coal gas respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas, the two-way flue gas enters deduster (7) after merging lump.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).Metallic recuperator (1) heating gas out from preheating gas, enter burner (3), spray into formation combustion flame in rotary kiln after mixing primary air, combustion flame further entrainments the auxiliary air by reactor product cooler (10) preheating, in the heat release of rotary kiln internal combustion, the output flue gas is discharged and is entered flue system from the afterbody of rotary kiln (4).
A kind of rotary kiln combustion system of utilizing low-heat value gas of embodiment 2-preheating furnace charge in parallel and primary air
As shown in Figure 3, be a kind of rotary kiln combustion system of utilizing low-heat value gas of preheating furnace charge in parallel and primary air.It is formed with burner (3), rotary kiln (4), the equipment configurations such as material petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), primary air fan (12) of slipping by the metallic recuperator (2) of preheating primary air, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium primary air respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (2) of preheating primary air, and finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).Metallic recuperator (2) hot primary air out from the preheating primary air, enter burner (3), form combustion flame with spraying in rotary kiln after coal gas mixes, combustion flame further entrainments the auxiliary air by reactor product cooler (10) preheating, in the heat release of rotary kiln internal combustion, the output flue gas is discharged and is entered flue system from the afterbody of rotary kiln (4).
A kind of rotary kiln combustion system of utilizing low-heat value gas of embodiment 3-preheating furnace charge in parallel, coal gas and primary air
As shown in Figure 4, be a kind of rotary kiln combustion system of utilizing low-heat value gas of preheating furnace charge in parallel, coal gas and primary air.It by the metallic recuperator (2) of the metallic recuperator (1) of preheating gas and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 3 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas, the 3rd tunnel enters the metallic recuperator (2) that forms the preheating primary air of two preheated burning media with the second tunnel, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).Metallic recuperator (1) heating gas out from preheating gas, enter burner (3), metallic recuperator (2) hot primary air out from the preheating primary air, also enter burner (3), these two kinds of combustion mediums spray into after mixing in burner (3) in rotary kiln and form combustion flame, combustion flame further entrainments the auxiliary air by reactor product cooler (10) preheating, in the heat release of rotary kiln internal combustion, the output flue gas is discharged and is entered flue system from the afterbody of rotary kiln (4).
A kind of rotary kiln combustion system of utilizing low-heat value gas of embodiment 4-preheating furnace charge in parallel, series connection preheated burning medium
As shown in Figure 5, be a kind of rotary kiln combustion system of utilizing low-heat value gas of preheating furnace charge in parallel, series connection preheated burning medium.It is connected with the metallic recuperator (1) of preheating gas by the metallic recuperator (2) of preheating primary air, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (2) of preheating primary air, then enter the metallic recuperator (1) of the preheating gas of arranged in series, finally lump enters deduster (7) again.Flue gas after deduster (7) dedusting or desulfurization or while dust-removal and desulfurizing, discharge from chimney (9) through air-introduced machine (8).Metallic recuperator (1) heating gas out from preheating gas, enter burner (3), metallic recuperator (2) hot primary air out from the preheating primary air, also enter burner (3), these two kinds of combustion mediums spray into after mixing in burner (3) in rotary kiln and form combustion flame, combustion flame further entrainments the auxiliary air by reactor product cooler (10) preheating, in the heat release of rotary kiln internal combustion, the output flue gas is discharged and is entered flue system from the afterbody of rotary kiln (4).
In each embodiment of above-mentioned a kind of rotary kiln combustion system of utilizing low-heat value gas, the metallic recuperator of preheating gas (1), or the metallic recuperator of preheating primary air (2), or the metallic recuperator (2) of the metallic recuperator of preheating gas (1) and preheating primary air simultaneously, be connected between the gas approach of the exhaust opening of rotary kiln (4) and stock column that flue gas enters material preheater (6) or material bed the position of the duct arrangement that is convenient to arbitrarily to smoke.As: offer metallic recuperator (1) that smoke extracting tube can connect preheating gas or the metallic recuperator (2) of preheating primary air at the shaft preheater furred ceiling of shaft preheater-lime rotary kiln system; Extend smoking cover at the color upside of the stream of slipping of shaft preheater-lime rotary kiln system, expecting petticoat pipe (5) (also claiming transfer slide), at the joint smoke extracting tube, can connect the metallic recuperator (1) of preheating gas or the metallic recuperator (2) of preheating primary air; In roasting, the calcining of nonferrous metallurgy system or reduce the heavy top, dirt chamber of kiln exit gas gravity of industrial rotary system or thereafter before waste heat boiler on flue, metallic recuperator (1) that smoke pipe connects preheating gas or the metallic recuperator (2) of preheating primary air can be set.
6. practicality
Due to, a kind of invention of the rotary kiln combustion system of utilizing low-heat value gas and the Foundation of innovative design are following energy-conservation with on can theory: one, take full advantage of the rotary kiln high-temperature flue gas and come preheating gas and air, the smoke pre-heating of recovery is turned back in the rotary kiln burner hearth; Two,, by improving the means of combustion medium temperature, the exotic fuels that utilize cheap low-heat value gas replacement or part to replace existing rotary kiln, as coke-stove gas, super sea coal, petroleum coke etc.; Three, be practically applicable to producer heating gas and other low calorific value gas fuel of colm.So, the various configurations scheme that this patent proposes all has, the flue-gas temperature that both can control discharge material preheater (6) is no more than follow-up flue gas and processes the operating temperature that exhaust dust device with bag commonly used allows, direct Mist heat recovering again, also can improve the fuel combustion temperature and realize substitute exotic fuels, etc. advantage.In industries such as building materials, direct ironmaking, metallurgical refractory material, lime calcining, the pretreatment of ferroalloy mineral aggregate and non-ferrous metals, calcined by rotary kiln, roasting or solid reduction smelting technology, have the wide application of sending out and the prospect of reducing energy consumption.
For example, in rotary kiln lime calcining system, when fuel is got cheap low heat value, (calorific value is lower than (2000～2500) * 4.18kJ/Nm
3) during coal gas (as high coke mixed gas, turn burnt mixed gas), the combustion product gases amount is more much bigger than the combustion product gases amount of the exotic fuels such as fine coal, coke-stove gas, after the preheating building stones, material preheater (6) exit gas temperature is also up to more than 350 ℃.As the cement burning system, adopt the further Mist heat recovering generating of low-temperature flue gas waste heat boiler, because the too little problem of scale can cause infeasible economically.Flue gas, after the preheating furnace charge, then is used for the preheated burning medium, although be feasible technically, the too small meeting of the indirect heat transfer temperature difference causes heat exchange efficiency low.Adopt the art of this patent scheme can solve above-mentioned contradiction.
And for example, at 600t/d scale 8360kJ/Nm
3the gas of calorific value burns in rotary kiln lime calcining system, adopt preheating furnace charge in parallel, a kind of rotary kiln combustion system of low-heat value gas of utilizing of coal gas and primary air is carried out coal gas and the two preheatings of wind, extract 12～20% high-temperature flue gas from the top of material preheater (6), a wind is preheating to 400 ℃, low-heat value gas is preheating to 200 ℃, can fuel saving 10～12%, improve approximately 150 ℃ of fuel combustion temperature, the coal dust or the coke-stove gas that reduce high heating value arrive minimum amount simultaneously, can make in addition material preheater (6) exhaust gas temperature be reduced to 200～250 ℃ by 300～350 ℃, meet the requirement of follow-up sack cleaner heatproof.The low calorie fuels oxygen-enriched combustion technology of promoting from being much better than especially economically country.
Claims (6)
1. a rotary kiln combustion system of utilizing low-heat value gas, it is characterized in that, metallic recuperator (1) by preheating gas, or the metallic recuperator of preheating primary air (2), or the metallic recuperator (2) of the metallic recuperator of preheating gas (1) and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 roads or 3 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas or the metallic recuperator (2) of preheating primary air, perhaps there is the 3rd tunnel to enter with the second tunnel and form the metallic recuperator (2) of preheating primary air of two preheated burning media or the metallic recuperator (1) of preheating gas, finally lump enters deduster (7) again.
2. a kind of rotary kiln combustion system of utilizing low-heat value gas according to claim 1, it is characterized in that, metallic recuperator (1) and burner (3) by preheating gas, rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium coal gas respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas, finally lump enters deduster (7) again.
3. a kind of rotary kiln combustion system of utilizing low-heat value gas according to claim 1, it is characterized in that, metallic recuperator (2) and burner (3) by the preheating primary air, rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium primary air respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (2) of preheating primary air, finally lump enters deduster (7) again.
4. a kind of rotary kiln combustion system of utilizing low-heat value gas according to claim 1, it is characterized in that, by the metallic recuperator (2) of the metallic recuperator (1) of preheating gas and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 3 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (1) of preheating gas, the 3rd tunnel enters the metallic recuperator (2) that forms the preheating primary air of two preheated burning media with the second tunnel, finally lump enters deduster (7) again.
5. a kind of rotary kiln combustion system of utilizing low-heat value gas according to claim 1, it is characterized in that, by the metallic recuperator (2) of the metallic recuperator (1) of preheating gas and preheating primary air simultaneously, with burner (3), rotary kiln (4), slip and expect petticoat pipe (5), material preheater (6), deduster (7), air-introduced machine (8), chimney (9), reactor product cooler (10), overfire air fan (11), the configuration of the equipment such as primary air fan (12) forms, rotary kiln high-temperature flue gas out, be divided into 2 tunnels preheating furnace charge and combustion medium respectively, the first via enters the material preheater (6) of preheating furnace charge, the second tunnel enters the metallic recuperator (2) of preheating primary air, then enter the metallic recuperator (1) of the preheating gas of arranged in series, finally lump enters deduster (7) again.
6. according to claim 1,2,3,4,5 described a kind of rotary kiln combustion systems of utilizing low-heat value gas, it is characterized in that, the metallic recuperator of preheating gas (1), or the metallic recuperator of preheating primary air (2), or the metallic recuperator (2) of the metallic recuperator of preheating gas (1) and preheating primary air simultaneously, be connected between the gas approach of the exhaust opening of rotary kiln (4) and stock column that flue gas enters material preheater (6) or material bed the position of the duct arrangement that is convenient to arbitrarily to smoke.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106048211A (en) * | 2016-07-15 | 2016-10-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Reduction roasting process for iron ore rotary kiln |
| CN106766846A (en) * | 2016-11-24 | 2017-05-31 | 新奥泛能网络科技股份有限公司 | A kind of heat recovery system |
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Application publication date: 20130515 |