CN104446823A - Silicon-calcium-potassium fertilizer cooling process and equipment - Google Patents
Silicon-calcium-potassium fertilizer cooling process and equipment Download PDFInfo
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- CN104446823A CN104446823A CN201410812278.9A CN201410812278A CN104446823A CN 104446823 A CN104446823 A CN 104446823A CN 201410812278 A CN201410812278 A CN 201410812278A CN 104446823 A CN104446823 A CN 104446823A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G1/00—Mixtures of fertilisers belonging individually to different subclasses of C05
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses a silicon-calcium-potassium fertilizer cooling process, comprising the following steps: 1) cooling drawn silicon-calcium-potassium fertilizer clinker to 500-700 DEG C with a first single-cylinder cooler by spraying water; 2) crushing the silicon-calcium-potassium fertilizer clinker cooled by spraying water to be less than 25mm by adopting a high-temperature roll crusher; 3) carrying out air cooling on the crushed silicon-calcium-potassium fertilizer clinker to be less than 100 DEG C by adopting a grate cooler or a second single-cylinder cooler, and simultaneously introducing the hot air discharged from the grate cooler or the second single-cylinder cooler into a rotary kiln and a decomposing furnace to respectively serve as secondary air and ternary air for supporting the combustion of a fuel. The invention also discloses equipment for implementing the silicon-calcium-potassium fertilizer cooling process. The process can be applied to drawn high-temperature sticky clinker or caked clinker, can be used for effectively cooling the high-temperature silicon-calcium-potassium fertilizer clinker and recovering waste heat, can improve the running rate of the equipment and has the characteristics of saving energy and reducing the production cost.
Description
Technical field
The invention belongs to silicon-calcium-potafertilizer fertilizer production technical field, be specifically related to the process for cooling of a kind of silicon-calcium-potafertilizer fertilizer after calcined by rotary kiln and equipment.
Background technology
The thinking of original single utilization potassium is broken away from the utilization in water-insoluble potassium ore deposit in recent years gradually, develops into the technical thought fully utilizing the wherein element such as silicon, calcium, potassium.Silicon-calcium-potafertilizer fertilizer contains the elements such as potassium, silicon, calcium, magnesium, is a kind of soil conditioner of high-quality, big area can improves China's soil fertility.With water-insoluble potassium ore deposit (as potassium felspar sand) and Wingdale (or rhombspar) for raw material production silicon-calcium-potafertilizer fertilizer, mainly contain traditional pyrogenic process, tunnel kiln sintering method and static hydrothermal method three kinds at present.
Tradition pyrogenic process take potassium ore as raw material, with addition of Wingdale and coal, and high-temperature calcination in shaft kiln after abrasive dust, balling-up, then pulverize and make.The subject matter that the method exists is, sintering degree is uneven, and quality product does not pass a test; And sinter easily lumps and sticky furnace wall in stove, not easily stirring and blanking, not only cause operational difficulty, and have a strong impact on seed output and quality.Patent ZL92111690.X discloses " a kind of production method of potash-lime fertilizer ", its technological process is: make bulk after potassium ore powder and limestone powder or ground dolomite mix by a certain percentage, be placed in annular kiln, tunnel furnace or down-draft kiln again and calcine, sinter forms potash-lime fertilizer product or silicon-magnesium potash fertilizer product through pulverizing.There is not yet the report that tunnel kiln sintering silicon-calcium-potafertilizer fertilizer reclaims high temperature chamotte heat content.Static hydrothermal method is the stirring and evenly mixing that adds water by a certain percentage after rich potassium silicate rock and unslaked lime is broken, grinding, then autoclave is inserted, pass into high pressure steam, 190 ~ 200 DEG C, under the temperature and pressure of 1.1 ~ 1.3MPa static state constant-temperature reaction take out after 10 ~ 12 hours, thus obtain the microporous mineral fertilizer of half wet condition.
Patent (application number 2014100155479) discloses " a kind of production technique of silicon-calcium-potafertilizer fertilizer and equipment ", its technological process is: with water-insoluble potassium ore deposit and Wingdale or rhombspar for raw material, sequentially through fragmentation, grinding, calcined by rotary kiln, cooler cooling, broken and grinding, obtain silicon-calcium-potafertilizer fertilizer.The equipment that wherein process for cooling adopts can be grate cooler, can be single cylinder cooling machine, or the cooler of other structural shape.In order to obtain high-quality silicon-calcium-potafertilizer fertilizer product, need in production process to improve calcining temperature until product is molten state.Grate-cooler belongs to quenching formula gas-solid heat exchange equipment, and cooling air through the grog bed of material, makes grog be cooled with vertical direction.The subject matter that direct employing grate-cooler cooling silicon-calcium-potafertilizer fertilizer grog exists is: in rotary kiln high-temperature burning process, silicon-calcium-potafertilizer fertilizer grog can be semi-melting state, may occur that grog is clamminess and block the problem such as comb seam, " making a snowman " that grate-cooler fixes grate plate, maybe may there is grog knot bulk, cannot normal cooling, and then have a strong impact on the safe operation of equipment and the effective cooling of grog.These the clinker massess cannot thoroughly cool usually, and its center partial heat is comparatively large, and heat is difficult to effective utilization.Therefore, develop a kind of process for cooling and the equipment that can be widely used in silicon-calcium-potafertilizer fertilizer production field, the high temperature stickness grog of kiln discharge and bulk grog are cooled, recovery part heat simultaneously, burn till hear rate for reduction, improve operation rate, the meaning reducing production cost is very great.
Summary of the invention
The present invention is directed to the technical problem existed in calcined by rotary kiln technology, provide a kind of silicon-calcium-potafertilizer fertilizer process for cooling and equipment, this Processes and apparatus can effective cooling grog, reduces and burns till hear rate, and then reduces silicon-calcium-potafertilizer fertilizer production cost, has the feature of energy-conserving and environment-protective.
The present invention is directed to the technical scheme that the technical problem that exists in calcined by rotary kiln technology takes is: a kind of silicon-calcium-potafertilizer fertilizer process for cooling, adopts following steps:
One) adopt the first single cylinder cooling machine of the built-in water pipeline of band and air draft pipe by kiln discharge silicon-calcium-potafertilizer fertilizer grog water-spraying control to 500 ~ 700 DEG C, wherein, the process of water-spraying control is: the water of water pipeline ejection contacts with the high temperature stickiness grog or bulk silicon-calcium-potafertilizer fertilizer grog entering the first single cylinder cooling machine, high temperature stickiness grog or bulk grog surface temperature reduce rapidly, become water vapour and be drawn to steam treatment system by air draft pipe after water heat absorption;
Two) high temperature roller crusher is adopted by the silicon-calcium-potafertilizer fertilizer chamotte crushing after water-spraying control to below 25mm;
Three) grate-cooler or the second single cylinder cooling machine is adopted by air-cooled for the silicon-calcium-potafertilizer fertilizer grog after fragmentation to less than 100 DEG C, the hot blast going out grate-cooler or the second single cylinder cooling machine is introduced in rotary kiln Sum decomposition stove, the secondary air combustion-supporting respectively as fuel combustion and tertiary air simultaneously.
The present invention is directed to another technical scheme that the technical problem that exists in calcined by rotary kiln technology takes is: a kind of equipment realizing above-mentioned silicon-calcium-potafertilizer fertilizer process for cooling, comprise the first single cylinder cooling machine, high temperature roller crusher and the grate-cooler or the second single cylinder cooling machine that are connected in turn, described first single cylinder cooling machine inside arranges water pipeline and air draft pipe, described water pipeline is connected with water spray system, and described air draft pipe is connected with steam treatment system; The water exit position of described water pipeline is arranged on the feed end of described first single cylinder cooling machine, and the opening for feed of described first single cylinder cooling machine is connected with rotary kiln head-shield, and discharge opening is connected with the opening for feed of described high temperature roller crusher; The discharge opening of described high temperature roller crusher is connected with the opening for feed of described grate-cooler or the second single cylinder cooling machine; Described grate-cooler or the second single cylinder cooling machine are provided with hot-blast outlet, and the hot-blast outlet of described grate-cooler or described second single cylinder cooling machine is connected with rotary kiln head-shield Sum decomposition stove respectively by sirocco reclamation airduct.
Described water pipeline is provided with injection flow rate setting device.
Described sirocco reclamation airduct is provided with dust-precipitator.
Described sirocco reclamation airduct is provided with blower fan.
Described sirocco reclamation airduct is connected respectively with rotary kiln head-shield Sum decomposition stove, and described sirocco reclamation airduct is provided with valve, and the pipeline connecting described sirocco reclamation airduct and rotary kiln head-shield and decomposing furnace is provided with valve.
The beneficial effect that the present invention has is: the present invention can be applicable to kiln discharge high temperature stickiness grog or bulk grog, and has the function of high temperature silicon-calcium-potafertilizer fertilizer grog effective cooling and waste heat recovery concurrently.Under the temperature that the silicon-calcium-potafertilizer fertilizer grog going out rotary kiln can be born by water-spraying control to high temperature roller crusher in the first single cylinder cooling machine of band waterworks, achieve high temperature stickness grog surface chilling, improve Clinker Flow; Bulk chamotte crushing after water-spraying control can be become fritter by high temperature roller crusher, and then fully contacts with cooling air in follow-up grate cooler or the second single cylinder cooling machine, thoroughly cools; Bulk grog is after high temperature roll-type crusher in crushing, the heat at bulk grog center also fully can be reclaimed by grate-cooler or the second single cylinder cooling machine, hot blast enters secondary air combustion-supporting as fuel combustion in rotary kiln Sum decomposition stove and tertiary air through sirocco reclamation airduct, can significantly reduce firing system hear rate.Relative to the technique directly adopting grate-cooler cooling, the present invention can the high temperature stickness grog of effective cooling kiln discharge and bulk grog, improves operation rate, has save energy and reduces the feature of production cost.
Accompanying drawing explanation
Fig. 1 is that the first realizes the equipment schematic diagram of silicon-calcium-potafertilizer fertilizer process for cooling of the present invention;
Fig. 2 is the equipment schematic diagram that the second realizes silicon-calcium-potafertilizer fertilizer process for cooling of the present invention.
In figure: band arrow dotted line is air flow line, band arrow solid line is stream direction, and 1 be the first single cylinder cooling machine, 2 are high temperature roller crushers, 3 are grate-coolers, 4 are dust-precipitators, 5 are blower fans, 6 are sirocco reclamation airducts, 7 are rotary kiln head-shields, 8 are rotary kilns, 9 are decomposing furnaces, 11 are water pipelines, 12 are air draft pipes, 13 are water spray systems, 14 are steam treatment systems, 31 is second single cylinder cooling machines.
Embodiment
For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
See Fig. 1 and Fig. 2, a kind of silicon-calcium-potafertilizer fertilizer process for cooling, comprises the following steps:
One) adopt the first single cylinder cooling machine of the built-in water pipeline of band and air draft pipe by kiln discharge silicon-calcium-potafertilizer fertilizer grog water-spraying control to 500 ~ 700 DEG C; Wherein, the process of water-spraying control is: the water of water pipeline ejection contacts with the high temperature stickiness grog or bulk silicon-calcium-potafertilizer fertilizer grog entering the first single cylinder cooling machine, high temperature stickiness grog or bulk grog surface temperature reduce rapidly, become water vapour and be drawn to steam treatment system by air draft pipe after water heat absorption;
Two) high temperature roller crusher is adopted by the silicon-calcium-potafertilizer fertilizer chamotte crushing after water-spraying control to below 25mm;
Three) grate-cooler or the second single cylinder cooling machine is adopted by air-cooled for the silicon-calcium-potafertilizer fertilizer grog after fragmentation to less than 100 DEG C, the hot blast going out grate-cooler or the second single cylinder cooling machine is introduced in rotary kiln Sum decomposition stove, the secondary air combustion-supporting respectively as fuel combustion and tertiary air simultaneously.
See Fig. 1 and Fig. 2, realize the equipment of above-mentioned silicon-calcium-potafertilizer fertilizer process for cooling, comprise the first single cylinder cooling machine 1, high temperature roller crusher 2 and the grate-cooler 3 or the second single cylinder cooling machine 31 that are connected in turn, described first single cylinder cooling machine 1 inside arranges water pipeline 11 and air draft pipe 12, described water pipeline 11 is connected with water spray system 13, and described air draft pipe 12 is connected with steam treatment system 14; The water exit position of described water pipeline 11 is arranged on the feed end of described first single cylinder cooling machine 1, and the opening for feed of the first single cylinder cooling machine 1 is connected with rotary kiln head-shield 7, and discharge opening is connected with the opening for feed of high temperature roller crusher 2; The discharge opening of high temperature roller crusher 2 is connected with the opening for feed of grate-cooler 3 or the second single cylinder cooling machine 31; Grate-cooler 3 or the second single cylinder cooling machine 31 are provided with hot-blast outlet, and hot-blast outlet is connected with rotary kiln head-shield 7 Sum decomposition stove 9 respectively by sirocco reclamation airduct 6.
High temperature roll-type crusher's rollers circle material heatproof more than 700 DEG C, and can ensure its wear resisting property at the working temperature.Grate-cooler 3 can be third generation grate-cooler or forth generation grate-cooler, also can be the grate-cooler of other type; Above-mentioned water pipeline is provided with injection flow rate setting device, to make injection flow rate controlled.
The Main Function of above-mentioned first single cylinder cooling machine 1 is to go out the high temperature silicon-calcium-potafertilizer fertilizer grog water-spraying control of rotary kiln, controls the first single cylinder cooling machine outlet silicon-calcium-potafertilizer fertilizer clinker temperature at 500 ~ 700 DEG C by regulating injection flow rate.Spraying water water droplet in water-spraying control process can not be too small, namely can not " be atomized ", otherwise the water drop contact of ejection has just been taken away by air draft pipe less than grog, does not reach cooling performance; Spray water water droplet can not be excessive simultaneously, otherwise can not flash evapn after water drop contact grog, on the one hand disadvantageous effect is caused to the refractory materials of the first single cylinder cooling machine inside, shorten its life-span, the water content in grog can be strengthened on the other hand, affect heat recovery efficiency.The size of water spray water droplet needs by regulating the design of injection flow rate and shower nozzle to realize.Water is introduced in water pipeline 11 by water spray system 13, the water spray position of water pipeline 11 is positioned at the feed end of the first single cylinder cooling machine 1, the water of ejection contacts with the silicon-calcium-potafertilizer fertilizer grog entering the first single cylinder cooling machine, silicon-calcium-potafertilizer fertilizer grog surface temperature is reduced to rapidly certain control temperature, become water vapour after water heat absorption, injection flow rate can regulate automatically according to the first single cylinder cooling machine exhaust end silicon-calcium-potafertilizer fertilizer clinker temperature.The feed end of the first single cylinder cooling machine 1 is provided with air draft pipe 12, the water vapour that water spray produces is drawn to steam treatment system 14, avoids water vapour to enter in rotary kiln, affect the normal calcining of silicon-calcium-potafertilizer fertilizer grog.Water pipeline 11 and air draft pipe 12 reach its feed end through the first single cylinder cooling machine 1, cool the high temperature silicon-calcium-potafertilizer fertilizer grog going out rotary kiln, take the water vapour of generation in time away simultaneously.
The opening for feed of above-mentioned high temperature roller crusher 2 connects the discharge opening of the first single cylinder cooling machine 1, the Main Function of high temperature roller crusher 2 be by water-spraying control after bulk chamotte crushing become fritter, and then be conducive to follow-uply fully contacting with cooling air in grate cooler or the second single cylinder cooling machine, thorough cooling, is also conducive to the recovery of bulk grog center heat simultaneously.
The opening for feed of grate-cooler 3 or the second single cylinder cooling machine 31 connects the discharge opening of high temperature roller crusher 2, the Main Function of grate-cooler 3 or the second single cylinder cooling machine 31 is the heat content of the silicon-calcium-potafertilizer fertilizer grog reclaiming out high temperature roller crusher, and by below silicon-calcium-potafertilizer fertilizer clinker cooling to 100 DEG C.Grate-cooler 3 or the second single cylinder cooling machine 31 connect sirocco reclamation airduct 6, sirocco reclamation airduct 6 is provided with dust-precipitator 4 and blower fan 5, wind is drawn by blower fan 5, the hot blast going out grate-cooler 3 or the second single cylinder cooling machine 31 is introduced in rotary kiln head-shield 7 Sum decomposition stove 9, the secondary air combustion-supporting respectively as fuel combustion and tertiary air.The effect of dust-precipitator 4 is that the hot blast grate-cooler 3 or the second single cylinder cooling machine 31 is carried out separation dedusting, and dust-precipitator 4 is provided with blanking airlock.Sirocco reclamation airduct 6 is connected respectively with rotary kiln head-shield 7 Sum decomposition stove 9, sirocco reclamation airduct 6 is provided with valve, the pipeline connecting sirocco reclamation airduct 6 and rotary kiln head-shield 7 and decomposing furnace 9 is provided with valve, the hot blast going out grate-cooler 3 or the second single cylinder cooling machine 31 can be carried out properly distributed, enter rotary kiln 8 Sum decomposition stove 9 respectively.
Principle of work of the present invention and key problem in technology are:
1) high temperature silicon-calcium-potafertilizer fertilizer grog secondary cooling: the present invention adopts the first single cylinder cooling machine 1 and grate-cooler 3 or the second single cylinder cooling machine 31 to form secondary cooling.The silicon-calcium-potafertilizer fertilizer grog going out rotary kiln enters in the first single cylinder cooling machine 1 by wicket cover 7, regulates injection flow rate to control the first single cylinder cooling machine 1 export silicon-calcium-potafertilizer fertilizer clinker temperature at 500 ~ 700 DEG C by water spray system 13.Grate-cooler 3 or the second single cylinder cooling machine 31 adopt air-cooled mode by air-cooled to being less than 100 DEG C for the fritter silicon-calcium-potafertilizer fertilizer grog after going out high temperature roll-type crusher in crushing.The object of first step cooling that wherein the first single cylinder cooling machine 1 is formed is under the temperature in order to high temperature bulk grog surface cool be born to high temperature roll-type crusher's rollers cover.The second stage cooling that grate-cooler 3 or the second single cylinder cooling machine 31 are formed is the main body of heat recuperation.First step cooling is the service of high temperature roller crusher, and second stage cooling is the key ensureing higher thermal organic efficiency.
2) heat recuperation: the hot blast going out grate-cooler 3 or the second single cylinder cooling machine 31 blower fan 5 draw wind under, after dust-precipitator 4 gathers dust, enter in sirocco reclamation airduct 6, sirocco reclamation airduct 6 is divided into two-way to connect rotary kiln head-shield 7 Sum decomposition stove 9 respectively, the hot blast entering rotary kiln head-shield 7 is called secondary air, the hot blast entering decomposing furnace 9 is called tertiary air, and the air force of secondary air and tertiary air is adjustable by the valve on sirocco reclamation airduct 6.Origin of heat is the sensible heat of high temperature roller crusher outlet silicon-calcium-potafertilizer fertilizer grog.
The present invention can be applicable to kiln discharge high temperature stickiness or bulk grog, and have the function of high temperature silicon-calcium-potafertilizer fertilizer grog effective cooling and waste heat recovery concurrently, reduce and burn till hear rate, expand the suitability of rotary system, improve operation rate, contribute to the reduction of silicon-calcium-potafertilizer fertilizer production cost.
Why adopting the first single cylinder cooling machine by kiln discharge silicon-calcium-potafertilizer fertilizer grog water-spraying control to 500 ~ 700 DEG C, is because be subject to the restriction of high temperature roll-type crusher's rollers loop material heat-resistant, wear-resistant performance.After the heat-resistant antifriction performance of high temperature roll-type crusher's rollers loop material gets a promotion, also the first single cylinder cooling machine can be adopted to be sprayed water by kiln discharge silicon-calcium-potafertilizer fertilizer grog the temperature be chilled to higher than 700 DEG C, then adopt grate-cooler or the second single cylinder cooling machine to carry out cooling and recovery of heat.If roller loop material heatproof, more than 1100 DEG C, also can cancel the first single cylinder cooling machine, directly take high temperature roller crusher to carry out fragmentation the high temperature chamotte going out rotary kiln, then only adopt grate-cooler or the second single cylinder cooling machine to carry out cooling and recovery of heat.
Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above, protection scope of the present invention is not limited in above-mentioned embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (2)
1. a silicon-calcium-potafertilizer fertilizer process for cooling, is characterized in that, adopts following steps:
One) adopt the first single cylinder cooling machine of the built-in water pipeline of band and air draft pipe by kiln discharge silicon-calcium-potafertilizer fertilizer grog water-spraying control to 500 ~ 700 DEG C, wherein, the process of water-spraying control is: the water of water pipeline ejection contacts with the high temperature stickiness grog or bulk silicon-calcium-potafertilizer fertilizer grog entering the first single cylinder cooling machine, high temperature stickiness grog or bulk grog surface temperature reduce rapidly, become water vapour and be drawn to steam treatment system by air draft pipe after water heat absorption;
Two) high temperature roller crusher is adopted by the silicon-calcium-potafertilizer fertilizer chamotte crushing after water-spraying control to below 25mm;
Three) grate-cooler or the second single cylinder cooling machine is adopted by air-cooled for the silicon-calcium-potafertilizer fertilizer grog after fragmentation to less than 100 DEG C, the hot blast going out grate-cooler or the second single cylinder cooling machine is introduced in rotary kiln Sum decomposition stove, the secondary air combustion-supporting respectively as fuel combustion and tertiary air simultaneously.
2. one kind realizes the equipment of silicon-calcium-potafertilizer fertilizer process for cooling as claimed in claim 1, it is characterized in that, comprise the first single cylinder cooling machine, high temperature roller crusher and the grate-cooler or the second single cylinder cooling machine that are connected in turn, described first single cylinder cooling machine inside arranges water pipeline and air draft pipe, described water pipeline is connected with water spray system, and described air draft pipe is connected with steam treatment system; The water exit position of described water pipeline is arranged on the feed end of described first single cylinder cooling machine, and the opening for feed of described first single cylinder cooling machine is connected with rotary kiln head-shield, and discharge opening is connected with the opening for feed of described high temperature roller crusher; The discharge opening of described high temperature roller crusher is connected with the opening for feed of described grate-cooler or the second single cylinder cooling machine; Described grate-cooler or the second single cylinder cooling machine are provided with hot-blast outlet, and the hot-blast outlet of described grate-cooler or described second single cylinder cooling machine is connected with rotary kiln head-shield Sum decomposition stove respectively by sirocco reclamation airduct.
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