CN103968671B - A kind of cement kiln utilizes the device and method of liquid oxygen and liquid nitrogen cooling grog - Google Patents

A kind of cement kiln utilizes the device and method of liquid oxygen and liquid nitrogen cooling grog Download PDF

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Publication number
CN103968671B
CN103968671B CN201410240969.6A CN201410240969A CN103968671B CN 103968671 B CN103968671 B CN 103968671B CN 201410240969 A CN201410240969 A CN 201410240969A CN 103968671 B CN103968671 B CN 103968671B
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temperature
air
cooling
cooler
grate
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CN103968671A (en
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陈晓东
郝利炜
顾军
谌玉双
熊运贵
户宁
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Beijing Co Ltd Of Jinyu Group
Beijing Building Materials Academy of Sciences Research
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Beijing Co Ltd Of Jinyu Group
Beijing Building Materials Academy of Sciences Research
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding
    • Y02P40/121Energy efficiency measures, e.g. improving or optimising the production methods

Abstract

The invention discloses the device and method that a kind of cement kiln utilizes liquid oxygen and liquid nitrogen cooling grog.Described device is that cement-kiln grate-cooler high temperature cooling area is provided with liquid oxygen input interface, middle temperature drop warm area is provided with liquid nitrogen input interface, described method is the liquid oxygen adding total blast volume 1% to 12% in the cooling-air sent at the air blast of cement-kiln grate-cooler high temperature section, adds the liquid nitrogen of total blast volume 1% to 45% in the cooling-air that the air blast of cement-kiln grate-cooler middle-temperature section is sent into.In the present invention, liquid oxygen passes into and improves clinker cooling speed, makes high temperature chamotte quenching, prevents or reduces C 3s, the decomposition of 1250 DEG C, prevent or reduces MgO crystal and separates out, improve grog stability; Prevent C 3the crystal of S is grown up, and improves the grindability of grog.Liquid nitrogen passes into and effectively prevent or reduces C 2the crystal transfer of S.

Description

A kind of cement kiln utilizes the device and method of liquid oxygen and liquid nitrogen cooling grog
Technical field
The present invention relates to cement kiln oxygen-enriched combusting field, utilizing the device and method of liquid oxygen and liquid nitrogen cooling grog in particular to a kind of cement kiln, is that a kind of liquid oxygen and liquid nitrogen of utilizing cools grog and strengthen the device and method of preheating in rotary kiln decomposing system burning.
Background technology
Oxygen-enriched combusting refers to the burning in the oxygen-enriched air higher than air (containing oxygen 20.9%) oxygen concentration: it is an energy-efficient combustion technology, all has application in glass industry, metallurgical industry and Thermal Power Engineering Field.Only have the oxygen of 20.9% in usual air, fuel because anoxic can reduce caloric value, causes energy waste when air burning: coal (comprising oil product, natural gas), when 26% ~ 31% oxygen concentration, obtains best efficiency of combustion.Oxygen-enriched combusting mechanism sends in combustion apparatus by high-concentration oxygen, improves the oxygen content of combustion air, thus improve kiln efficiency of combustion, makes fuel change into heat energy greatly in oxygen-enriched combusting.
Along with the aggravation of global energy crisis, rising steadily of fuel price and improving constantly of environmental requirement, the production cost of enterprise is more and more higher, and energy-saving and cost-reducing and protection of the environment is the major issue of each enterprise development.Oxygen-enriched combusting is as the premium properties of newer combustion technology in energy-conservation and reduction of discharging, and the application in industrial furnace obtains popularization energetically.Along with cement production enterprise energy-saving and emission-reduction put more effort, reduce energy resource consumption and become the important means reduced costs, oxygen-enriched combustion technology reaches its maturity.
The patent of invention of publication number CN102434890 describes employing membrane separation technique, is separated the oxygen rich gas of acquisition two kinds of different purity in air, then sends into the different portions of multicenter combustor of cement rotary kiln respectively
Position, carries out oxygen-enriched combustion-supporting.This invention is without the need to improving existing burner, enhancing the modulability of oxygen-enriched combusting.But to improve and under improving the prerequisite of combustibility, cement kiln also will solve another problem, prevent from the excessive decomposition of tricalcium silicate when temperature is more than 1250 DEG C exactly and prevent or reduce MgO crystal separating out, improve grog stability; Prevent C 3the crystal of S is grown up, and improves the grindability of grog.In addition, rotary kiln clinker, at the middle-temperature section of grate-cooler, also needs to solve C 2the crystal formation transfer problem of S, especially at the high C of production 2during S grog product, more need the mode by cooling rapidly, make grog interval quickly through crystal formation inversion temperature, therefore cement kiln is provided with clinker cooling section, its objective is and is cooled by the grog of high temperature, to improve above-mentioned problem, but what current cooling section adopted is that powerful Air cooler uses natural air, and it is large to there is cooling energy consumption in the change along with environment temperature, the problem of cooling effect instability, and then the problem affecting cement product quality.
Summary of the invention
The object of this invention is to provide the device and method that a kind of cement kiln utilizes liquid oxygen and liquid nitrogen cooling grog.That a kind of liquid oxygen and liquid nitrogen of utilizing cools grog and strengthen the device and method of preheating in rotary kiln decomposing system burning.
To achieve these goals, technical scheme of the present invention is:
A kind of cement kiln utilizes the device of liquid oxygen and liquid nitrogen cooling grog, comprise cement-kiln grate-cooler, the high temperature chamotte of cement kiln out falls into cement-kiln grate-cooler afterwards from rotary kiln, described cement-kiln grate-cooler is sequentially set with high temperature cooling area, middle temperature drop warm area, low temperature cooling area, described high temperature chamotte is through high temperature cooling area, next process section is proceeded to behind middle temperature drop warm area and low temperature cooling area, air-cooled air blast is respectively arranged with in described grate-cooler high temperature cooling area and middle temperature drop warm area, the output or input channel of the air-cooled air blast in described high temperature cooling area are provided with liquid oxygen input interface, the output or input channel of the air-cooled air blast of described middle temperature drop warm area are provided with liquid nitrogen input interface, a liquid oxygen source is connected with liquid oxygen input interface by liquid oxygen tube connector, a liquid nitrogen source is connected with liquid nitrogen input interface by liquid nitrogen connecting tube, control circuit controls liquid oxygen and the feeding ratio of air and the feeding ratio of liquid nitrogen and air according to the temperature of high temperature cooling area and middle temperature drop warm area.
Scheme is further: described control circuit comprises industrial control unit (ICU), air velocity transducer, flow control electromagnetic valve, variable frequency power controller, temperature sensor;
When liquid oxygen input interface and liquid nitrogen input interface are separately positioned on air blast output channel time, the described air velocity transducer for measuring air quantity is set described high temperature cooling area air-cooled air blast output channel is from air blast delivery outlet to liquid oxygen input interface and described middle temperature drop warm area air-cooled air blast delivery outlet to liquid nitrogen input interface respectively;
When liquid oxygen input interface and liquid nitrogen input interface are separately positioned on air blast input channel time, the described air velocity transducer for measuring air quantity is set between the air-cooled air blast input channel air inlet to liquid oxygen input interface of described high temperature cooling area and between described middle temperature drop warm area air-cooled air blast input channel air inlet to liquid nitrogen input interface respectively;
Described liquid oxygen tube connector and liquid nitrogen connecting tube are respectively arranged with described flow control electromagnetic valve, what the motor of described air-cooled air blast connected is described variable frequency power controller, high temperature cooling area and the middle temperature drop warm area of described grate-cooler are respectively arranged with described temperature sensor, described air velocity transducer, temperature sensor are connected to the signal input circuit of industrial control unit (ICU), and the control output circuit of described industrial control unit (ICU) connects variable frequency power controller, flow control electromagnetic valve respectively.
A kind of cement kiln utilizes the method for liquid oxygen and liquid nitrogen cooling grog, it is the method utilizing liquid oxygen and liquid nitrogen cooling grog of described device, it is characterized in that, described method is the liquid oxygen containing total blast volume 1% to 12% in the cooling-air sent at the air blast of cement-kiln grate-cooler high temperature section, contains the liquid nitrogen of total blast volume 1% to 45% in the cooling-air that the air blast of cement-kiln grate-cooler middle-temperature section is sent into.
Scheme is further: described method comprises further:
A, after cement kiln works well, open liquid oxygen transfer passage, in grate-cooler high temperature section centre position, when gas temperature is higher than 1150 DEG C, increase the cooling air delivery that air blast is sent into, liquid oxygen containing total blast volume 1% to 12% in cold air flows, when gas temperature is lower than 1050 DEG C, reduce the cooling air delivery that air blast is sent into, or close liquid oxygen transfer passage;
B, after cement kiln works well, open liquid nitrogen transfer passage, in grate-cooler middle-temperature section centre position, when gas temperature is higher than 550 DEG C, increase the cold air flows that air blast is sent into, containing the liquid nitrogen of 1% to 45% of total blast volume in cold air flows, promote cooling rapidly, when gas temperature is lower than 400 DEG C, reduce the cooling air delivery that air blast is sent into.
Scheme is further: the liquid oxygen including total blast volume 1% in described grate-cooler high temperature section cooling air delivery, includes the liquid nitrogen of total blast volume 1% in described grate-cooler middle-temperature section cooling air delivery.
Scheme is further: the liquid oxygen including total blast volume 12% in described grate-cooler high temperature section cooling air delivery, includes the liquid nitrogen of total blast volume 45% in described grate-cooler middle-temperature section cooling air delivery.
The present invention compared with prior art tool has the following advantages:
The advantage that liquid oxygen passes into:
1, accelerate the heat exchange of grog, make high temperature chamotte quenching, prevent or reduce C3S the decomposition of 1250 DEG C, prevent or reducing MgO crystal and separate out, improve grog stability; Prevent C 3the crystal of S is grown up, and improves the grindability of grog.
2, the ignition temperature passing into reduction fuel of liquid oxygen and minimizing tail-off time, accelerate burning velocity, promote to burn completely; Make flame have higher flame temperature and blackness simultaneously.
3, reduce excess air coefficient, reduce the exhaust gas volumn after burning.
The advantage that liquid nitrogen passes into:
Effectively prevent or reduce C 2the crystal transfer of S.At grog through about 500 DEG C temperature sections, passing into of liquid nitrogen, makes grog quickly through this temperature section, effectively prevents β-C 2s is to γ-C 2the crystal transfer of S, prevents the powder phenomenon-tion of grog, improves the intensity of grog.
Below in conjunction with drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is that cement-kiln grate-cooler liquid oxygen of the present invention and liquid nitrogen add structural representation;
Fig. 2 is that the another kind of liquid oxygen of cement-kiln grate-cooler of the present invention and liquid nitrogen add structural representation;
Fig. 3 is control circuit logic schematic diagram of the present invention.
Detailed description of the invention
Embodiment 1:
A kind of cement kiln utilizes the device of liquid oxygen and liquid nitrogen cooling grog, as depicted in figs. 1 and 2, comprise cement-kiln grate-cooler 1, the high temperature chamotte 2 of cement kiln out falls into cement-kiln grate-cooler afterwards from rotary furnace 3, described cement-kiln grate-cooler is sequentially set with high temperature cooling area 1-1, middle temperature drop warm area 1-2 and low temperature cooling area 1-3, described high temperature chamotte is through high temperature cooling area, next process section is proceeded to behind middle temperature drop warm area and low temperature cooling area, air-cooled air blast 4 and 5 is respectively arranged with in described grate-cooler high temperature cooling area and middle temperature drop warm area, the output channel 4-1 of the air-cooled air blast in described high temperature cooling area is provided with liquid oxygen input interface 6, the output channel 5-1 of the air-cooled air blast of described middle temperature drop warm area is provided with liquid nitrogen input interface 7, or as shown in Figure 2, the input channel 4-2 of the air-cooled air blast in described high temperature cooling area is provided with liquid oxygen input interface, the input channel 5-2 of the air-cooled air blast of described middle temperature drop warm area is provided with liquid nitrogen input interface, a liquid oxygen source 8 is connected with liquid oxygen input interface by liquid oxygen tube connector 9, a liquid nitrogen source 10 is connected with liquid nitrogen input interface by liquid nitrogen connecting tube 11, control circuit controls liquid oxygen and the feeding ratio of air and the feeding ratio of liquid nitrogen and air according to the temperature of high temperature cooling area and middle temperature drop warm area.
In embodiment: as shown in Figure 3, described control circuit comprises industrial control unit (ICU) 12, air velocity transducer 13, flow control electromagnetic valve 14, variable frequency power controller 15, temperature sensor 16;
When liquid oxygen input interface and liquid nitrogen input interface are separately positioned on air blast output channel time, the described air velocity transducer 13 for measuring air quantity is set described high temperature cooling area air-cooled air blast output channel is from air blast delivery outlet to liquid oxygen input interface and described middle temperature drop warm area air-cooled air blast delivery outlet to liquid nitrogen input interface respectively;
When liquid oxygen input interface and liquid nitrogen input interface are separately positioned on air blast input channel time, the described air velocity transducer 13 for measuring air quantity is set between the air-cooled air blast input channel air inlet 4-2-1 to liquid oxygen input interface of described high temperature cooling area and between described middle temperature drop warm area air-cooled air blast input channel air inlet 5-2-1 to liquid nitrogen input interface respectively;
Described liquid oxygen tube connector and liquid nitrogen connecting tube are respectively arranged with described flow control electromagnetic valve 14, what the motor of described air-cooled air blast connected is described variable frequency power controller, high temperature cooling area and the middle temperature drop warm area of described grate-cooler are respectively arranged with described temperature sensor, described air velocity transducer, temperature sensor are connected to the signal input circuit of industrial control unit (ICU), and the control output circuit of described industrial control unit (ICU) connects variable frequency power controller, flow control electromagnetic valve respectively; Industrial control unit (ICU) is wherein PLC ripe on market.
In the above embodiments, described high-temperature region is that the temperature of different usual high-temperature region entrance is the highest from high-temperature region entrance to the temperature of outlet (namely grog entrance sends mouth to grog), and temperature sensor is also arranged on high-temperature region entrance or entrance between exporting.Equally, described middle warm area therefrom warm area entrance is that the temperature of different middle warm area entrance is usually the highest to the temperature of outlet (namely grog entrance sends mouth to grog), and temperature sensor is also arranged on middle warm area entrance or entrance between exporting.
The cold air entered in grate-cooler by the air compartment below grate-cooler is heated to form high-temperature hot-air and draws from the upper end of grate-cooler and form Secondary Air and tertiary air after carrying out sufficient heat exchange with the high temperature chamotte in grate, is sent into rotary kiln (Secondary Air) Sum decomposition stove (tertiary air) respectively combustion-supporting.Therefore, in the above embodiments, described high temperature cooling area is the grate region that Secondary Air and high temperature cooling area tertiary air and grog carry out the grate-cooler of heat exchange, temperature sensor is arranged on high temperature section and the middle-temperature section of grate-cooler, high temperature cooling area refer in grate-cooler with grog heat exchange after gas temperature higher than the region of 700 DEG C, middle temperature drop warm area refer in grate-cooler with grog heat exchange after gas temperature in the region of 700 DEG C-300 DEG C.
Embodiment 2:
A kind of cement kiln utilizes the method for liquid oxygen and liquid nitrogen cooling grog, it is the method utilizing liquid oxygen and liquid nitrogen cooling grog based on device described in embodiment 1, described method is the liquid oxygen containing total blast volume 1% to 12% in the cooling-air sent at the air blast of cement-kiln grate-cooler high temperature section, contains the liquid nitrogen of total blast volume 1% to 45% in the cooling-air that the air blast of cement-kiln grate-cooler middle-temperature section is sent into.
In embodiment, described method comprises further:
A, after cement kiln works well, open liquid oxygen transfer passage, in grate-cooler high temperature section centre position, when gas temperature is higher than 1150 DEG C, increase the cooling air delivery that air blast is sent into, the liquid oxygen containing total blast volume 1% to 12% in cold air flows, the content of liquid oxygen is regulated to make it produce the effect of rapid drawdown temperature, i.e. temperature decrease within 10 seconds weeks; When gas temperature is lower than 1050 DEG C, reduce the cooling air delivery that air blast is sent into, or close liquid oxygen transfer passage;
B, after cement kiln works well, open liquid nitrogen transfer passage, in grate-cooler middle-temperature section centre position, when gas temperature is higher than 550 DEG C, increase the cold air flows that air blast is sent into, containing the liquid nitrogen of 1% to 45% of total blast volume in cold air flows, regulate the liquid nitrogen in cold air flows, make it within 10 seconds, be cooled to rapidly 450 DEG C, when gas temperature is lower than 400 DEG C, reduce the cooling air delivery that air blast is sent into.
Centre position wherein refers to the position between this section of both sides, and location point is determined according to on-the-spot practical operation situation, can be described as a dynamic ad-hoc location.
Described increase, reduce cooling air delivery that air blast sends into and ensure that liquid oxygen, the percentage of liquid nitrogen in cooling air delivery are: industrial control unit (ICU) controls output circuit control connection variable frequency power controller and flow control electromagnetic valve respectively according to control instruction by it.
In embodiment, a preferred plan is: the liquid oxygen including total blast volume 1% in described grate-cooler high temperature section cooling air delivery, includes the liquid nitrogen of total blast volume 1% in described grate-cooler middle-temperature section cooling air delivery.
In embodiment, another preferred plan is: the liquid oxygen including total blast volume 12% in described grate-cooler high temperature section cooling air delivery, includes the liquid nitrogen of total blast volume 45% in described grate-cooler middle-temperature section cooling air delivery.
Liquid oxygen refers to industrial liquid oxygen.The method of industrial manufacture liquid oxygen is that liquid towards air carries out fractionation, and its Main physical character is as follows: air pressure (101.325 kPa) lower density 1.141 g/ usually , freezing point 50.5 K(-222.65 ° of C), boiling point 90.188 K(-182.96 ° of C).
Add the heat exchange that liquid oxygen accelerates grog in high-temperature region in embodiment, make high temperature chamotte quenching, prevent or reduce C 3s, the decomposition of 1250 DEG C, adds liquid nitrogen at middle warm area and prevent or reduces the precipitation of MgO crystal, improve grog stability; Prevent C 3the crystal of S is grown up, and improves the grindability of grog.
The ignition temperature passing into reduction fuel of liquid oxygen and minimizing tail-off time, accelerate burning velocity, promote to burn completely; Make flame have higher flame temperature and blackness reduces excess air coefficient simultaneously simultaneously, reduce the exhaust gas volumn after burning.
In cement production process, liquid oxygen enters grate-cooler with air, and liquid runs into high temperature chamotte, and liquid becomes gas, and this is an endothermic reaction, therefore accelerates caloric value and changes;
Clinker for primary raw material, is mixed with raw material by proper proportion with lime stone and clay, ferriferous raw material, burns to part or all of melting, and the semi-finished product obtained through cooling.Grog, after rotary kiln burns till, be sent into grate-cooler and carry out extremely cold.
The high temperature chamotte of grate-cooler is fallen at about 1350 DEG C from kiln head cover.While high temperature chamotte falls into grate-cooler from kiln head cover, below grate-cooler, strong cold wind is blasted grate-cooler lower air chamber and through clinker layer by high pressure air-cooler, now in grate, grog is in suspended state substantially, high temperature chamotte and cold air complete sufficient heat exchange within a short period of time, cold wind makes high temperature chamotte cool rapidly, multi mineral composition in grog crystallizes into metastable crystalline phase and reaches stable state rapidly, and the cold air that high pressure air-cooler blasts then is heated rapidly.Thin clinker particles flows into the aggregate bin below grate by the pore of grate, the grog of larger particles then keeps certain thickness to move to discharge end with certain speed with grate plate, after the cold wind of middle warm area and low-temperature space continues cooling, the conveying equipment falling into grate-cooler after the fragmentation of grate-cooler disintegrating machine enters clinker warehouse, technique requires the clinker temperature going out grate-cooler is now ambient temperature about+65 DEG C, the cold air entered in grate-cooler by the air compartment below grate-cooler is heated to form high-temperature hot-air after carrying out sufficient heat exchange with the high temperature chamotte in grate, enter rotary kiln (Secondary Air) Sum decomposition stove (tertiary air) respectively combustion-supporting.After Pure Low Temperature Waste Heat Power Generation Plant in Cement system puts into operation, will from grate-cooler Extraction parts hot blast, kiln hood AQC stove utilizes these used heat to carry out cogeneration or heating etc., to reach the object of heat recovery energy-saving and emission-reduction.
Grate-cooler is the key equipment in cement produced with the dry method production process, the effect that high temperature chamotte in grate-cooler is cooled not only is carry in the middle of whole cement production process, but also be improved out grate-cooler clinker quality, improve grog and prepare the grindability of link at cement, improve Secondary Air, tertiary air temperature, the effect such as combustion-supporting to rotary system.The equipment such as the grate-cooler of clinker cooling system and the five-stage cyclone preheater of firing system, dore furnace, rotary kiln combine mutually, together constitute a cement production process cooling and firing system system.The function of grate-cooler can from following two aspect introductions:
(1) from cement industry aspect, grate-cooler primary responsibility is also named quenching to the high temperature chamotte fast cooling falling into grate-cooler.High temperature chamotte falls into grate-cooler from kiln head cover, cold air is pressed as in the air compartment of grate-cooler by the high pressure cooling blower below grate-cooler, then cold wind penetrates rapidly the clinker layer in grate from comb, make high temperature chamotte cool the recovery simultaneously realizing heat rapidly, in this process there is the physical-chemical reaction of series of complex in high temperature chamotte in grate-cooler.The grindability of the crystal of good cooling results also can be fine in the process.
(2) from thermal technology's angle, the high temperature chamotte in the cold wind blasted by high pressure cooling blower under combing while grog realizes quenching in grate-cooler and grate realizes quick-cooling, heating heat convection, thus realizes the recovery to heat entrained by high temperature chamotte.Reclaim the hot blast that obtains except a part as Secondary Air and tertiary air combustion-supporting, some enters kiln hood AQC stove generating of Pure Low Temperature Waste Heat Power Generation Plant in Cement system after kiln hood dust-precipitator.Therefore, if reclaim the hot blast that obtains to remain on a higher temperature always, so this is to the hear rate reducing rotary kiln Sum decomposition ring joint, is all favourable to the generated energy of afterheat generating system.On the contrary, if the heat recovery efficiency of grate-cooler is lower, so this not only has impact to the cooling quality of grog, and the coal consumption to firing system and the generated energy to afterheat generating system all have adverse effect, and then energy-saving and cost-reducing unfavorable to enterprise.
(3) grate-cooler bears cooling to high temperature chamotte and conveying task, and he is convenient to transport to high temperature chamotte and storage to the cooling of high temperature chamotte.If without the cooling of grate-cooler, high temperature chamotte be carried must to adopt resistant to elevated temperatures equipment, this can improve production cost and also very serious to the damage of equipment.

Claims (3)

1. a cement kiln utilizes liquid oxygen and liquid nitrogen to cool the method for grog, it is the method utilizing liquid oxygen and liquid nitrogen cooling grog device based on cement kiln, described device comprises cement-kiln grate-cooler, the high temperature chamotte of cement kiln out falls into cement-kiln grate-cooler afterwards from rotary kiln, described cement-kiln grate-cooler is sequentially set with high temperature cooling area, middle temperature drop warm area, low temperature cooling area, described high temperature chamotte is through high temperature cooling area, next process section is proceeded to behind middle temperature drop warm area and low temperature cooling area, air-cooled air blast is respectively arranged with in described grate-cooler high temperature cooling area and middle temperature drop warm area, the output or input channel of the air-cooled air blast in described high temperature cooling area are provided with liquid oxygen input interface, the output or input channel of the air-cooled air blast of described middle temperature drop warm area are provided with liquid nitrogen input interface, a liquid oxygen source is connected with liquid oxygen input interface by liquid oxygen tube connector, a liquid nitrogen source is connected with liquid nitrogen input interface by liquid nitrogen connecting tube, control circuit controls liquid oxygen and the feeding ratio of air and the feeding ratio of liquid nitrogen and air according to the temperature of high temperature cooling area and middle temperature drop warm area, it is characterized in that, described method is the liquid oxygen containing total blast volume 1% to 12% in the cooling-air sent at the air blast of cement-kiln grate-cooler high temperature section, liquid nitrogen containing total blast volume 1% to 45% in the cooling-air that the air blast of cement-kiln grate-cooler middle-temperature section is sent into,
Concrete steps comprise:
A, after cement kiln works well, open liquid oxygen tube connector, in grate-cooler high temperature section centre position, when gas temperature is higher than 1150 DEG C, increase the cooling air delivery that air blast is sent into, liquid oxygen containing total blast volume 1% to 12% in cold air flows, when gas temperature is lower than 1050 DEG C, reduce the cooling air delivery that air blast is sent into, or close liquid oxygen tube connector;
B, after cement kiln works well, opens liquid nitrogen connecting tube, in grate-cooler middle-temperature section centre position, when gas temperature is higher than 550 DEG C, increase the cold air flows that air blast is sent into, containing the liquid nitrogen of 1% to 45% of total blast volume in cold air flows, promote to lower the temperature rapidly; When gas temperature lower than 400 DEG C constantly, reduce air blast send into cooling air delivery.
2. a kind of cement kiln according to claim 1 utilizes the method for liquid oxygen and liquid nitrogen cooling grog, it is characterized in that, include the liquid oxygen of total blast volume 1% in described grate-cooler high temperature section cooling air delivery, in described grate-cooler middle-temperature section cooling air delivery, include the liquid nitrogen of total blast volume 1%.
3. a kind of cement kiln according to claim 1 utilizes the method for liquid oxygen and liquid nitrogen cooling grog, it is characterized in that, include the liquid oxygen of total blast volume 12% in described grate-cooler high temperature section cooling air delivery, in described grate-cooler middle-temperature section cooling air delivery, include the liquid nitrogen of total blast volume 45%.
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