CN113277760B - Method and system for cooperatively disposing electrolytic manganese slag by cement kiln - Google Patents
Method and system for cooperatively disposing electrolytic manganese slag by cement kiln Download PDFInfo
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- CN113277760B CN113277760B CN202110735911.9A CN202110735911A CN113277760B CN 113277760 B CN113277760 B CN 113277760B CN 202110735911 A CN202110735911 A CN 202110735911A CN 113277760 B CN113277760 B CN 113277760B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/364—Avoiding environmental pollution during cement-manufacturing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention discloses a method and a system for cooperatively disposing electrolytic manganese slag by a cement kiln, belonging to the utilization technology of electrolytic manganese slag. In the novel dry cement clinker production line, electrolytic manganese slag and coal are added into a coal mill according to a proportion, and the electrolytic manganese slag and the coal are mixed, dried and ground at the same time, so that the obtained coal dust containing the electrolytic manganese slag is stored, the stored coal dust is sprayed into a decomposing furnace through a coal spraying pipe, and the decomposing furnace is kept to normally operate. The invention utilizes the existing cement clinker production line of the pre-decomposition kiln to carry out harmless treatment and resource utilization on electrolytic manganese slag.
Description
Technical Field
The invention relates to the technical field of electrolytic manganese slag utilization, in particular to a method and a system for cooperatively disposing electrolytic manganese slag by a cement kiln.
Background
The cement producing process is mainly "two grinding and one burning" and is made up by mixing calcareous raw material and siliceous raw material according to a certain proportion, grinding into raw material, then calcining at high temp. in kiln system to form cement clinker, adding gypsum and grinding. During the calcination of cement clinker, a large amount of nitrogen oxides (NOx) are generated, and statistics data related to environmental protection departments show that the emission of nitrogen oxides in the cement industry accounts for about 10-12% of the total national amount. NOx is various in hazard, and can enter the deep part of the lung of a human body through breathing to cause bronchitis or emphysema, and can generate photochemical reaction with other pollutants in the atmosphere to form photochemical smog pollution, and meanwhile, the NOx is one of causes of acid rain. For this reason, the emission limit of NOx in the flue gas of the cement industry is more and more strict in China, and denitration is a big task facing the cement industry.
SNCR is a flue gas denitration technology widely applied in cement industry in China, and utilizes a proper temperature range (900-1100 ℃) in a decomposing furnace to spray an ammonia-water mixture into the decomposing furnace, and ammonia (NH) is sprayed into the decomposing furnace at the temperature 3 ) With NO in flue gas x Reaction to produce N 2 And H 2 O. However, this technique consumes a large amount of ammonia water.
The electrolytic manganese slag is acid slag produced by acid leaching, neutralization, press filtration and other procedures of manganese carbonate ore in the electrolytic manganese production process, and contains SiO 2 、CaO、Al 2 O 3 、Fe 2 O 3 、SO 3 、MgO、R 2 Chemical formation of O and heavy metalsThe main pollutants of the ecological water-saving agent are heavy metals, ammonia and residual acid, and the ecological water-saving agent can permeate into surrounding water and soil when stacked, so that ecological environment and human health are endangered. The method is a large country for producing electrolytic manganese, and electrolytic manganese slag produced in the production process reaches more than 1000 ten thousand tons/year, so that an economic and safe disposal method is not available so far, and therefore, the serious disposal pressure is faced.
Cement kiln co-disposal of solid waste is a hotspot in research and practice of the cement industry, including attempts at cement kiln co-disposal of electrolytic manganese slag. The utilization and treatment of manganese slag in the existing cement production comprise: manganese slag is used as raw material of raw material, combustion improver component material, admixture component material and the like. When the manganese slag is used as a combustion improver composition material, the manganese slag consumption is small in proportion, the disposal amount is very limited, and the disposal requirement on the manganese slag cannot be met. As a cement admixture or raw material, the electrolytic manganese slag needs to be subjected to high-temperature calcination desulfurization to be applied in a large amount, and the electrolytic manganese slag pretreatment equipment is generally needed, so that the treatment cost is high. The existing cement kiln is used for cooperatively disposing electrolytic manganese slag, and a disposal method which does not need to add new important equipment and does not influence the cement production of the existing production line is not provided.
CN1837120a discloses a method for producing cement by utilizing electrolytic manganese slag, limestone, electrolytic manganese slag, iron powder, fluorite and anthracite are mixed and ground into raw materials, and the raw materials are sintered into clinker by ball forming. The method is only suitable for cement production in the vertical kiln, which is a lagged production process equipment, and is eliminated in China due to low yield, poor cement quality and the like.
CN201911374625.3 discloses a device and a method for cooperatively treating electrolytic manganese slag based on a dry rotary kiln cement production line, which also utilizes equipment such as a rotary kiln, a kiln tail smoke chamber, a decomposing furnace and the like for cement production, and is also provided with a metering, conveying and national entering device for adding manganese slag into the kiln tail smoke chamber. The electrolytic manganese slag is heated and decomposed in a kiln tail smoke chamber, inorganic components of the electrolytic manganese slag are cement clinker components, ammonia is volatilized and then enters a decomposing furnace, and the electrolytic manganese slag also plays a role in denitration. However, this method has the following disadvantages: (1) The raw manganese slag containing water is directly added from a kiln tail smoke chamber, so that the manganese slag cannot be uniformly dispersed, and the manganese slag and other materials cannot be uniformly mixed and reacted, so that the quality of cement clinker is affected; (2) The moisture in the manganese slag is high, and after the manganese slag is added into a kiln tail smoke chamber, the moisture is evaporated, more heat is required to be absorbed, so that the heat consumption is improved, the thermal system is disturbed, and the normal production is influenced; (3) The flow field characteristic of the kiln tail smoke chamber and the NOx formation and reduction reaction characteristic in the cement kiln have little effect on reducing NOx in the smoke by ammonia in the manganese slag.
CN201610840058.6 is a composite coal injection combustion improver for cement kiln and application thereof, and discloses a combustion improver comprising the following raw materials in proportion: 25-40% of manganese slag, 15-25% of red mud, 20-35% of lead-zinc tailings, 5-10% of rare earth tailings, 8-20% of nickel slag and 2-6% of industrial permanganate. The raw materials are weighed and mixed according to the proportion, then the raw materials and raw coal are fed into a mill according to the mass proportion, and the raw materials and the raw coal are ground together into mixed powder and are fed into a cement kiln system. Or the raw materials are weighed and mixed according to a proportion, and are singly ground into powder in a mill and then mixed with pulverized coal. When the coal for cement calcination is brown coal, the mass consumption of the composite coal injection combustion improver for the cement kiln is 0.2.6% of the mass of the coal; when the coal is bituminous coal, the mass consumption of the composite coal injection combustion improver for the cement kiln is 0.4-0.8% of the mass of the coal; when the coal is anthracite, the mass dosage of the composite coal injection combustion improver for the cement kiln is 0.5 to 1.2 percent of the mass of the coal. In the patent, manganese slag is used as one of the components of the combustion improver to be mixed with coal dust, but the consumption of the combustion improver is low, and the large-scale treatment of the manganese slag cannot be realized.
If the defect of the existing cement kiln for cooperatively disposing electrolytic manganese slag can be overcome, inorganic components in the manganese slag are components of cement clinker, and simultaneously ammonia in the manganese slag is effectively utilized to remove NOx in smoke, so that the manganese slag is turned into wealth, and multiple effects of protecting environment, saving resources, reducing cement production cost and the like are achieved.
Disclosure of Invention
The invention aims to solve the problems and provide a method and a system for cooperatively disposing electrolytic manganese slag by a cement kiln, which utilize the existing cement clinker production line of a pre-decomposition kiln to perform harmless disposal and resource utilization on the electrolytic manganese slag.
In a novel dry cement clinker production line, electrolytic manganese slag and coal are added into a coal mill in proportion, and the electrolytic manganese slag and the coal are mixed, dried and ground at the same time, so that the obtained coal dust containing the electrolytic manganese slag is stored, the stored coal dust is sprayed into a decomposing furnace through a coal spraying pipe, and the decomposing furnace keeps normal operation.
Preferably, the water content of the electrolytic manganese slag is 15-30%, and the addition amount of the electrolytic manganese slag is 5-15% of that of coal.
The system for cooperatively disposing the electrolytic manganese slag in the cement kiln comprises a coal powder burner, wherein the coal powder burner is used for spraying coal powder obtained by uniformly mixing and grinding the electrolytic manganese slag to be disposed in a coal mill into an electrolytic furnace of a novel dry cement clinker production line for combustion, so that the electrolytic manganese slag is cooperatively disposed.
The pulverized coal burner comprises a central ignition tube, a central air tube, a pulverized coal tube and a shell which are coaxially sleeved in sequence from inside to outside, and a channel formed by the pulverized coal burner from the center to the outside in sequence is a central ignition channel, a central air channel, a pulverized coal channel and a regulating air channel; the outlet end of the air adjusting channel is provided with an air adjusting structure, and the air adjusting structure comprises adjusting blades, guide rails, guide blocks and an adjusting push rod device, wherein the guide rails, the guide blocks and the adjusting push rod device are arranged along the length direction of the air adjusting channel; the regulating blade is an alloy sheet with toughness and heat resistance; the guiding rails are uniformly arranged at intervals along the circumferential direction of the air adjusting channel, each guiding rail is composed of corresponding guiding grooves respectively arranged on the pulverized coal pipe and the shell, and one end of each guiding rail extends obliquely relative to the curved surface of the air adjusting channel and relatively penetrates through the outlet end of each guiding rail; the guide blocks are positioned at the other ends of the guide rails and correspond to the guide rails one by one, and guide holes for adjusting the blades to pass through are formed in the guide blocks; one end of each adjusting blade is arranged on the guide rail, the length edge ends of the adjusting blades are respectively arranged in the corresponding guide grooves in a sliding manner, the adjusting blades can move along the guide rails, and the other ends of the adjusting blades penetrate through the guide blocks and are parallel and coplanar with the central axis of the adjusting wind channel; the adjusting push rod device comprises a driving device, a push rod and a push ring, wherein the push ring is annularly arranged and is connected with one end, far away from a guide rail, of an adjusting blade, the push rod is arranged in a circumferential interval along an adjusting wind channel, one end of the push rod is connected with the push ring, the other end of the push rod is connected with the driving device, the driving device enables the adjusting blade connected with the push ring to synchronously move by pushing the push rod, so that the adjusting blade can move along the guide rail, and the adjusting wind channel interval forms a spiral wind outlet channel.
Preferably, the guide rail is 8-16cm long.
Preferably, the thickness of the regulating blade is 0.1-0.5mm.
Preferably, the length edge of the adjusting blade is slidably sleeved on the sliding part, the sliding part is correspondingly arranged in the guide groove, and the sliding part is internally provided with an elastic clamping opening corresponding to the adjusting blade and an adjusting cavity which is positioned in the sliding part and is connected with the clamping opening.
Preferably, the device comprises two groups of adjusting push rod devices, wherein each group of adjusting push rod devices is respectively connected with adjusting blades arranged at intervals and can respectively push the adjusting blades to move along the guide track.
Preferably, the guide block at least divides the wind adjusting channel into two channels, and the air inlet end of the guide block opposite to the wind adjusting channel is in a sharp angle structure.
By adopting the technical scheme, the invention has the following beneficial effects:
1. according to the invention, the coal mill can dry the moisture in the manganese slag through the high-temperature flue gas from the grate cooler, so that the link of independently drying the moisture in the manganese slag is reduced.
2. According to the invention, the manganese slag is mixed into the coal in proportion, mixed and ground in the coal mill, so that the uniformity and stability of the manganese slag added into a cement kiln system are fully ensured.
3. According to the invention, the pulverized coal doped with the manganese slag is added into the decomposing furnace through the coal injection pipe, so that on one hand, the heat required by carbonate decomposition can be ensured, and meanwhile, ammonia formed by volatilization of ammonia in the manganese slag is subjected to chemical reaction with NOx in the decomposing furnace, so that a good auxiliary denitration effect is achieved, the consumption of ammonia water can be saved, and the denitration cost is saved.
4. The inorganic component in the electrolytic manganese slag finally becomes a component of cement clinker, and the heavy metal also has the effect of promoting calcination and is well solidified in the clinker.
5. The invention can carry out innocent treatment on the manganese slag in a large scale at low cost. The yield of cement clinker in the predecomposition kiln is generally up to more than 5000 tons/d, and if 10 percent of the cement clinker is mixed in the coal dust of the decomposing furnace, the annual treatment manganese slag amount is more than 7000 tons.
Drawings
FIG. 1 is a schematic illustration of the process flow of the present invention.
FIG. 2 is a schematic view showing the structure of a burner for a decomposing furnace according to the present invention.
FIG. 3 is a schematic cross-sectional view of one end of a burner port of the present invention.
Fig. 4 is a schematic diagram of a regulated wind architecture according to the present invention.
Fig. 5 is a schematic view of section A-A of fig. 3.
Fig. 6 is a schematic view of another state structure in fig. 5.
Fig. 7 is a schematic cross-sectional view of the adjusting blade of the present invention on a guide rail.
Fig. 8 is an example of a circumferentially developed view of a corresponding guide rail on a pulverized coal pipe according to the present invention.
Fig. 9 is a circumferentially expanded view of a corresponding guide rail on a pulverized coal pipe according to another embodiment of the present invention.
In the drawings, a 1-electrolytic manganese slag bin, a 2-decomposing furnace raw coal bin, a 3-decomposing furnace coal mill, a 4-decomposing furnace coal bin, a 5-coal burner, a 6-rotary kiln raw coal bin, a 7-rotary kiln coal mill, an 8-rotary kiln coal bin, a 9-rotary kiln burner, a 10-grate cooler, an 11-rotary kiln, a 12-decomposing furnace, a 13-fifth stage cyclone preheater, a 14-fourth stage cyclone preheater, a 15-third stage cyclone preheater, a 16-second stage cyclone preheater, a 17-first stage cyclone preheater, a 51-central ignition tube, a 52-central air tube, a 53-coal powder tube, a 54-outer shell, a 55-central ignition channel, a 56-central air channel, a 57-coal powder channel, a 58-adjusting air channel, a 59-adjusting air structure, 591-adjusting blades, 592-guide rails, 593-guide blocks, 594-push rings, 595-push rods, 596-driving devices, 597-sliding pieces, 598-adjusting cavities, 599-elastic clamping ports, 510-burner bodies, 520-air inlet tubes, 530-540-inlet tubes and air inlet tubes.
Detailed Description
The following is a further description of the specific embodiments of the invention with reference to the accompanying drawings.
The electrolytic manganese slag is taken as acid waste slag in electrolytic manganese production and is classified as class II general industrial solid waste, and the electrolytic manganese slag contains Al 2 O 3 、SiO 2、 Fe 2 O 3 CaO and SO 3 And the like, and also contains more heavy metals and ammonia nitrogen, which is unfavorable for the large-scale reuse of electrolytic manganese slag.
According to the method for cooperatively disposing electrolytic manganese slag in the cement kiln, in a novel dry cement clinker production line, electrolytic manganese slag is proportionally added into a coal mill, and the electrolytic manganese slag and the coal mill are mixed, dried and ground at the same time, so that the obtained coal dust containing the electrolytic manganese slag is stored, the stored coal dust is sprayed into a decomposing furnace 12 through a coal spraying pipe, and the decomposing furnace 12 is kept in normal operation, so that the electrolytic manganese slag is cooperatively disposed. The electrolytic manganese slag accounts for 5-15% of the weight of the coal. The coal powder is sprayed normally, so that the electrolytic manganese slag is treated cooperatively, the existing cement production equipment is not required to be changed, the electrolytic manganese slag is dried in a coal mill and added into the coal powder, and the coal powder operates according to the normal coal powder. Compared with the prior art, the method has the advantages that complicated pretreatment such as drying and deamination is not needed, and the manganese slag can be cooperatively treated on the existing novel dry cement clinker production line, so that the cost is low and the efficiency is high.
According to the invention, coal dust and electrolytic manganese slag powder are sprayed into the decomposing furnace 12 through the coal spraying pipe, the coal powder is combusted in the decomposing furnace 12, generated heat is used for decomposing carbonate, and ammonia in the electrolytic manganese slag is volatilized; the ammonia gas formed is combined in the decomposing furnace 12 with NO generated mainly from fuel x Chemical timely reaction occurs to generate denitration effect; the use of ammonia water in the decomposing furnace 12 can be effectively reduced; the electrolytic manganese slag is fully mixed with other materials in the decomposing furnace 12, and finally becomes the components of cement clinker after being calcined by a kiln system.
Example 1
Fig. 1 is a schematic diagram of a process flow in this embodiment, in which the dashed lines represent gas and material trends and the solid lines represent material trends. The coal-fired disposal equipment of the original decomposing furnace 12 in the novel dry cement clinker production line comprises: the device for treating the fire coal of the rotary kiln comprises a raw coal bin 2 of the decomposing furnace, a coal mill 3 of the decomposing furnace and a coal powder bin 4 of the decomposing furnace, wherein the fire coal treatment device of the rotary kiln comprises a raw coal bin 6 of the rotary kiln, a coal mill 7 of the rotary kiln (the rotary kiln and the coal mill of the decomposing furnace can commonly share one mill), a coal powder bin 8 of the rotary kiln and a burner 9 of the rotary kiln. The electrolytic manganese slag bin 1 is used for pre-storing and discharging manganese slag. The electrolytic manganese slag bin 1, the raw coal bin 2 of the decomposing furnace, the coal mill 3 of the decomposing furnace, the coal powder bin 4 of the decomposing furnace, the coal powder burner 5 and the decomposing furnace 12 form a main unit for the cooperative treatment of the electrolytic manganese slag. The decomposing furnace 12 is connected with five-stage cyclone preheaters, wherein the five-stage cyclone preheaters are respectively a fifth-stage cyclone preheater 13, a fourth-stage cyclone preheater 14, a third-stage cyclone preheater 15, a second-stage cyclone preheater 16 and a first-stage cyclone preheater 17; the decomposing furnace 12 is communicated with the kiln tail of the rotary kiln 11, the kiln head of the rotary kiln 11 is provided with a rotary kiln burner 9, and the kiln head of the rotary kiln 11 corresponds to the grate cooler 10.
On a novel dry cement clinker production line with 5000 tons of daily products, 10 percent of electrolytic manganese slag is doped into coal through a metering device and a conveying device, and the water content of the electrolytic manganese slag is about 22 percent. The method is characterized in that transported electrolytic manganese slag to be treated is firstly stored in a manganese slag bin 1, the electrolytic manganese slag is conveyed into a coal mill through a metering device and a conveying device and is treated together with raw coal, high-temperature waste gas of a rotary kiln is introduced into the coal mill, and the manganese slag is dried while being mixed with coal dust and is ground. The pulverized coal containing the manganese slag is stored in a pulverized coal bin dedicated to combustion in the decomposing furnace 12. The coal powder in the coal powder bin is sprayed into the decomposing furnace 12 through a coal spraying pipe of the decomposing furnace 12, and the generated heat is used for decomposing carbonate by burning the coal powder in the decomposing furnace 12.
The ammonia nitrogen in the manganese slag is volatilized by heating and reacts with NO in the decomposing furnace 12 x Contact reaction plays a role in assisting denitration. The raw material of the decomposing furnace 12 enters a rotary kiln and is calcined into cement clinker at high temperature, and Al in manganese slag 2 O 3 、SiO 2、 Fe 2 O 3 Inorganic components such as CaO and the like are all cement clinker components. Cement clinker having a value of kh=0.910, n=2.48, p=1.43 and a coal consumption of 100kg (standard coal), wherein the ratio in the decomposing furnace 1240%. NO in flue gas before disposal of manganese slag x 300mg/m 3 After the manganese slag is treated, NO in the flue gas x 255mg/m 3 。
Example 2
On a novel dry cement clinker production line with 5000 tons of daily products, 5 percent of electrolytic manganese slag is doped into coal through a metering device and a conveying device, and the water content of the electrolytic manganese slag is about 30 percent. The method is characterized in that transported electrolytic manganese slag to be treated is firstly stored in a manganese slag bin 1, the electrolytic manganese slag is conveyed into a coal mill through a metering device and a conveying device and is treated together with raw coal, high-temperature waste gas of a rotary kiln is introduced into the coal mill, and the manganese slag is dried while being mixed with coal dust and is ground. The pulverized coal containing the manganese slag is stored in a pulverized coal bin dedicated to combustion in the decomposing furnace 12. The coal powder in the coal powder bin is sprayed into the decomposing furnace 12 through a coal spraying pipe of the decomposing furnace 12, and the generated heat is used for decomposing carbonate by burning the coal powder in the decomposing furnace 12.
The ammonia nitrogen in the manganese slag is volatilized by heating and reacts with NO in the decomposing furnace 12 x Contact reaction plays a role in assisting denitration. The raw materials of the decomposing furnace 12 enter a rotary kiln and are calcined into cement clinker and Al in manganese slag at high temperature 2 O 3 、SiO 2、 Fe 2 O 3 Inorganic components such as CaO and the like are all cement clinker components. Cement clinker values kh=0.920, n=2.25, p=1.53, coal consumption 102kg (standard coal), with a proportion in the decomposing furnace 12 of 41%. NO in flue gas before disposal of manganese slag x 220mg/m 3 After the manganese slag is treated, NO in the flue gas x 190mg/m 3 。
Example 3
On a novel dry cement clinker production line with 5000 tons of daily products, 15 percent of electrolytic manganese slag is mixed into coal through a metering device and a conveying device, and the water content of the electrolytic manganese slag is about 15 percent. The method is characterized in that transported electrolytic manganese slag to be treated is firstly stored in a manganese slag bin 1, the electrolytic manganese slag is conveyed into a coal mill through a metering device and a conveying device and is treated together with raw coal, high-temperature waste gas of a rotary kiln is introduced into the coal mill, and the manganese slag is dried while being mixed with coal dust and is ground. The pulverized coal containing the manganese slag is stored in a pulverized coal bin dedicated to combustion in the decomposing furnace 12. The coal powder in the coal powder bin is sprayed into the decomposing furnace 12 through a coal spraying pipe of the decomposing furnace 12, and the generated heat is used for decomposing carbonate by burning the coal powder in the decomposing furnace 12.
The ammonia nitrogen in the manganese slag is volatilized by heating and reacts with NO in the decomposing furnace 12 x Contact reaction plays a role in assisting denitration. Sulfide in the manganese slag reacts with carbon at the same time, and plays a role in calcining and desulfurizing. The raw materials of the decomposing furnace 12 enter a rotary kiln and are calcined into cement clinker and Al in manganese slag at high temperature 2 O 3 、SiO 2、 Fe 2 O 3 Inorganic components such as CaO and the like are all cement clinker components. Cement clinker values kh=0.930, n=2.25, p=1.57, coal consumption 105kg (standard coal), with a proportion in the decomposing furnace 12 of 42%. NO in flue gas before disposal of manganese slag x 240mg/m 3 After the manganese slag is treated, NO in the flue gas x 185mg/m 3 。
The existing research shows that the electrolytic manganese slag contains sulfate, can partially replace gypsum to be used as retarder of cement clinker, and at the moment, heavy metal in the manganese slag can be solidified in the hydration hardening process of cement, so that the harm to the environment is reduced. However, since the manganese slag contains substances such as ammonia nitrogen and the like, the cement performance is obviously and negatively affected, and in practice, the doping amount of the electrolytic manganese slag as a retarder is limited. After high-temperature desulfurization and ammonia nitrogen removal treatment are carried out on the electrolytic manganese slag, the electrolytic manganese slag can be used as a cement mixture, the addition amount can reach more than 30%, however, the electrolytic manganese slag is required to be subjected to high-temperature pretreatment, the process is complex, and the treatment cost is high.
According to the invention, electrolytic manganese slag is added into a coal mill according to a proportion in a novel dry cement clinker production line, and the electrolytic manganese slag and the coal mill are mixed and dried, and are simultaneously ground, uniformly mixed with coal and ground, so that the obtained coal dust containing the electrolytic manganese slag is stored, the stored coal dust is sprayed into a decomposing furnace through a coal spraying pipe, and the decomposing furnace is kept to normally operate, so that the electrolytic manganese slag is cooperatively treated. The method does not need to change the equipment for producing the existing cement, does not need to carry out complex pretreatment such as drying, deamination and the like on the manganese slag, and can carry out cooperative treatment on the existing novel dry cement clinker production line, thereby having low cost and high efficiency.
The system for cooperatively disposing electrolytic manganese slag in a cement kiln comprises a coal powder burner 5, wherein the coal powder burner 5 is used for adding electrolytic manganese slag to be disposed in a coal mill, uniformly mixing and grinding coal, and spraying the obtained coal powder into an electrolytic furnace of a novel dry cement clinker production line for combustion, so that the electrolytic manganese slag is cooperatively disposed. Here, the system for co-disposing electrolytic manganese slag can co-dispose electrolytic manganese slag by utilizing the existing process equipment, but adjusts the spraying condition of coal dust by the coal dust burner 5, specifically, adjusts by setting the adjusting air channel 58 to make the sprayed coal dust and air mix more uniformly, so that the electrolytic manganese slag contained in the coal dust can diffuse uniformly along with the coal dust upwards along the decomposing furnace 12, and ammonia generated by decomposing the electrolytic manganese slag can be used for NO x The contact reaction plays a role in assisting denitration, so that concentration and uneven distribution of ammonia generated by decomposing electrolytic manganese slag are avoided, the denitration effect is enhanced, and the use of ammonia water is reduced.
As shown in fig. 2, the external structure of the pulverized coal burner 5 includes a burner body 510, a coal inlet pipe 520, an air inlet pipe 530, and a fuel pipe 540, wherein the burner body 510 is the core of the pulverized coal burner 5, the coal inlet pipe 520 is communicated with the pulverized coal pipe 53, the air inlet pipe 530 is communicated with the central air channel 56 and the adjusting air channel 58, and the fuel pipe 540 is communicated with the central ignition pipe 51.
As shown in fig. 3, the pulverized coal burner 5 or the burner body 510 includes a central ignition tube 51, a central air tube 52, a pulverized coal tube 53 and a housing 54 coaxially sleeved in sequence from inside to outside, and passages formed by the pulverized coal burner 5 from the center to the outside in sequence are a central ignition passage 55, a central air passage 56, a pulverized coal passage 57 and a regulating air passage 58. The outlet end of the adjusting wind channel 58 is provided with an adjusting wind structure 59, and the adjusting wind structure 59 comprises an adjusting blade 591, a guide rail 592 arranged along the length direction of the adjusting wind channel 58, a guide block 593 and an adjusting push rod 595.
As shown in fig. 4 to 6, the adjustment blade 591 is an alloy sheet having toughness and heat resistance. The thickness of the adjusting vane 591 is 0.1-0.5mm. The guide rails 592 are uniformly spaced circumferentially along the regulated air channel 58, and the guide rails 592 are formed by corresponding guide grooves respectively formed in the pulverized coal pipe 53 and the housing 54, and one end of the guide rails 592 extends obliquely relative to the curved surface of the regulated air channel 58 and extends through the outlet end of the guide rails 592. The guide blocks 593 are positioned at the other ends of the guide rails 592 and are in one-to-one correspondence with the guide rails 592, and guide holes for adjusting the passage of the blades 591 are formed in the guide blocks 593. One end of the adjusting blade 591 is arranged on the guide rail 592, the length edge ends of the adjusting blade 591 are respectively arranged in the corresponding guide grooves in a sliding manner, the adjusting blade 591 can move along the guide rail 592, and the other end of the adjusting blade 591 penetrates through the guide block 593 and is parallel and coplanar with the central axis of the adjusting wind channel 58.
Wherein, adjust push rod 595 device includes drive arrangement 596, push rod 595 and push ring 594, and push ring 594 is the annular setting and is connected with the one end that keeps away from guide rail 592 on the regulation blade 591, push rod 595 is along adjusting wind passageway 58 circumference interval in, and push rod 595 one end connection push ring 594, and drive arrangement 596 is connected to the push rod 595 other end, drive arrangement 596 makes the regulation blade 591 that push ring 594 connects synchronous movement through pushing push rod 595 to make regulation blade 591 can follow guide rail 592 and form spiral air-out passageway with adjusting wind passageway 58 interval.
Here, two sets of adjustment pushers 595 are included, each set of adjustment pushers 595 being respectively connected to the adjustment blades 591 arranged at intervals and being capable of respectively pushing the adjustment blades 591 along the guide rail 592. The guide blocks 593 at least divide the air adjusting passage 58 into two passages, and the air inlet end of the guide blocks 593 opposite to the air adjusting passage 58 is in a sharp angle structure.
As shown in fig. 7, the length edge of the adjusting blade 591 is slidably sleeved on the sliding piece 597, the sliding piece 597 is correspondingly installed in the guide groove, the elastic clamping opening 599 corresponding to the adjusting blade 591 is arranged in the sliding piece 597, and the adjusting cavity 598 which is positioned in the sliding piece 597 and connected with the clamping opening is arranged in the sliding piece 597. The adjustment cavity 598 may allow a margin to be provided at the length edge of the adjustment blade 591, so that when the adjustment blade 591 moves along the guide rail 592 to deform, the adjustment blade 591 is prevented from being blocked in the guide rail 592 due to insufficient width.
Wherein, fig. 8 is a circumferential expansion view of the corresponding guide rail 592 on the pulverized coal pipe 53, the guide rail 592 is 15cm long, the guide rail 592 is spirally arranged along the wall of the pulverized coal pipe 53, so that when the adjusting blade 591 is pushed along the guide rail 592, the guide rail 592 plays a role in deforming the adjusting blade 591, namely, the spiral air outlet of the adjusting air channel 58 formed by the adjusting blade 591 is under the action of the guide rail 592.
In fig. 9, a guide rail 592 is provided which is different from the guide rail 592 of fig. 8, the guide rail 592 being 12cm long; the guide rails 592 are arranged in parallel and then spirally along the wall of the pulverized coal pipe 53, and the spiral angle of the tail end of the guide rails 592 is larger. The guide rail 592 is provided as a guide table for adjusting the deformation of the adjusting blade 591, and particularly, the guide rail 592 not used can enable the adjusting blade 591 to be deformed differently, so as to form different air outlets of the adjusting air channel 58, and thus different rotary air is generated.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (2)
1. A system for cooperatively disposing electrolytic manganese slag by a cement kiln, which is characterized in that:
the device comprises a coal powder burner, wherein the coal powder burner is used for spraying coal powder obtained by adding electrolytic manganese slag to be treated and coal into a coal mill, uniformly mixing and grinding the mixture into an electrolytic furnace of a novel dry-method cement clinker production line for combustion, so that the electrolytic manganese slag is cooperatively treated;
the pulverized coal burner comprises a central ignition tube, a central air tube, a pulverized coal tube and a shell which are coaxially sleeved in sequence from inside to outside, and a channel formed by the pulverized coal burner from the center to the outside in sequence is a central ignition channel, a central air channel, a pulverized coal channel and a regulating air channel; the outlet end of the air adjusting channel is provided with an air adjusting structure, and the air adjusting structure comprises adjusting blades, guide rails, guide blocks and an adjusting push rod device, wherein the guide rails, the guide blocks and the adjusting push rod device are arranged along the length direction of the air adjusting channel; the regulating blade is an alloy sheet with toughness and heat resistance; the guiding rails are uniformly arranged at intervals along the circumferential direction of the adjusting wind channel, each guiding rail is composed of corresponding guiding grooves respectively arranged on the pulverized coal pipe and the shell, one end of each guiding rail extends obliquely relative to the curved surface of the adjusting wind channel and relatively penetrates through the outlet end of the adjusting wind channel, the guiding rails are arranged in a first parallel and then spiral mode along the wall of the pulverized coal pipe, and the spiral angle of the tail end of each guiding rail is larger; the guide blocks are positioned at the other ends of the guide rails and correspond to the guide rails one by one, and guide holes for adjusting the blades to pass through are formed in the guide blocks; one end of the adjusting blade is arranged on the guide rail, the adjusting blade can move along the guide rail, and the other end of the adjusting blade passes through the guide block and is parallel and coplanar with the central axis of the adjusting wind channel; the length edge ends of the adjusting blades are respectively arranged in the corresponding guide grooves in a sliding manner; the adjusting push rod device comprises a driving device, a push rod and a push ring, wherein the push ring is annularly arranged and connected with one end, far away from the guide rail, of the adjusting blade, the push rod is arranged in a circumferential interval along the adjusting wind channel, one end of the push rod is connected with the push ring, the other end of the push rod is connected with the driving device, and the driving device enables the adjusting blade connected with the push ring to synchronously move by pushing the push rod so that the adjusting blade can move along the guide rail, and the adjusting wind channel interval forms a spiral wind outlet channel;
the length of the guide rail is 8-16cm; the length edge of the adjusting blade is sleeved on the sliding part in a sliding way, the sliding part is correspondingly arranged in the guide groove, and the sliding part is internally provided with an elastic clamping opening corresponding to the adjusting blade and an adjusting cavity which is positioned in the sliding part and is connected with the clamping opening; the device comprises two groups of adjusting push rod devices, wherein each group of adjusting push rod devices is respectively connected with adjusting blades arranged at intervals and can respectively push the adjusting blades to move along the guide track.
2. The system for co-processing electrolytic manganese slag in a cement kiln according to claim 1, wherein: the thickness of the regulating blade is 0.1-0.5mm.
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| CN202110735911.9A CN113277760B (en) | 2021-06-30 | 2021-06-30 | Method and system for cooperatively disposing electrolytic manganese slag by cement kiln |
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| CN202110735911.9A CN113277760B (en) | 2021-06-30 | 2021-06-30 | Method and system for cooperatively disposing electrolytic manganese slag by cement kiln |
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| CN113277760B (en) * | 2021-06-30 | 2023-08-15 | 崇左南方水泥有限公司 | Method and system for cooperatively disposing electrolytic manganese slag by cement kiln |
| CN114110608B (en) * | 2021-11-29 | 2022-06-24 | 崇左南方水泥有限公司 | System and method for co-processing waste by utilizing industrial waste heat |
Citations (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB182034A (en) * | 1921-09-02 | 1922-06-29 | Kai Petersen | Improvements in and connected with furnaces adapted to burn various kinds of fuel |
| GB447996A (en) * | 1935-02-09 | 1936-05-29 | Gas Light & Coke Co | Improvements in or relating to gas governors |
| FR1441201A (en) * | 1965-07-23 | 1966-06-03 | Texaco Development Corp | Improvements to oil burners |
| US4206712A (en) * | 1978-06-29 | 1980-06-10 | Foster Wheeler Energy Corporation | Fuel-staging coal burner |
| GB8530734D0 (en) * | 1985-12-13 | 1986-01-22 | Peabody Holmes Ltd | Burner |
| CN1056518A (en) * | 1990-05-12 | 1991-11-27 | 张斯恒 | Combustion-supporting agent for fuel coal |
| CA2201578A1 (en) * | 1996-04-03 | 1997-10-03 | The Babcock & Wilcox Company | Rotated multi-cylinder air delivery port |
| WO2000061992A1 (en) * | 1999-04-09 | 2000-10-19 | Mcdermott Technology, Inc. | Tunneled multi-blade swirler/gas injector for a burner |
| CN101306425A (en) * | 2008-06-24 | 2008-11-19 | 卿富安 | Electrolytic manganese slag comprehensive utilization technique |
| WO2009034626A1 (en) * | 2007-09-12 | 2009-03-19 | Taiheiyo Cement Corporation | Cement kiln burner apparatus, and method for running the burner apparatus |
| WO2010016168A1 (en) * | 2008-08-08 | 2010-02-11 | 株式会社Ihi | Burner |
| KR20110136199A (en) * | 2010-06-14 | 2011-12-21 | 한국에너지기술연구원 | A burner structure of the kiln furnace for cement |
| CN102809151A (en) * | 2012-08-23 | 2012-12-05 | 上海三融环保工程有限公司 | Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace |
| CN103075729A (en) * | 2012-12-10 | 2013-05-01 | 傅宁芳 | Cement rotary kiln coal powder burner with oxygen-enriched micro-oil ignition device |
| CN203687028U (en) * | 2014-01-20 | 2014-07-02 | 淄博科邦热工科技有限公司 | Combined flow field decomposing furnace burner |
| CN104555947A (en) * | 2015-01-28 | 2015-04-29 | 重庆市淡水河谷矿业有限公司 | Method and system for recovering electrolytic manganese slag |
| CN104696953A (en) * | 2013-12-07 | 2015-06-10 | 黄冈圣嘉高新机电设备有限公司 | Blade angle adjustable four-channel whirl pulverized coal burner |
| CN105130217A (en) * | 2015-07-21 | 2015-12-09 | 湖南省小尹无忌环境能源科技开发有限公司 | Method of producing ecological activated slag through treatment on electrolytic manganese residue in vertical kiln factory |
| CN105217580A (en) * | 2015-09-18 | 2016-01-06 | 花垣县强桦矿业有限责任公司 | A kind of electrolytic manganese residues high temperature desulfurizing enriched flue gas prepares the method for sulfuric acid |
| CN205746817U (en) * | 2016-06-15 | 2016-11-30 | 辽宁春成矿山机械制造有限公司 | Spiral coal powder burner secondary wind adjustment of blade angle device |
| CN206683420U (en) * | 2017-04-07 | 2017-11-28 | 中材株洲水泥有限责任公司 | A kind of hypoxemia flameless combustion nitrogen rejection facility for cement kiln tail smoke-box |
| CN107474862A (en) * | 2017-08-29 | 2017-12-15 | 太原理工大学 | A kind of civilian clean coke and its processing method |
| CN110981231A (en) * | 2019-12-27 | 2020-04-10 | 湖南省小尹无忌环境能源科技开发有限公司 | Equipment and method for cooperatively treating electrolytic manganese slag on basis of dry-process rotary kiln cement production line |
| CN111594872A (en) * | 2020-04-13 | 2020-08-28 | 南京航空航天大学 | Deformable swirler air flow distribution intelligent adjusting system and method |
| KR20200104177A (en) * | 2019-02-26 | 2020-09-03 | 두산중공업 주식회사 | Turbine vane and turbine blade and gas turbine comprising the same |
| CN112066361A (en) * | 2020-09-04 | 2020-12-11 | 金丽颖 | Wet dust-removing energy-saving coal-fired boiler |
| CN112830699A (en) * | 2021-02-24 | 2021-05-25 | 北京科技大学 | Cement admixture, preparation method and application |
| CN113277760A (en) * | 2021-06-30 | 2021-08-20 | 崇左南方水泥有限公司 | Method and system for cooperatively treating electrolytic manganese slag in cement kiln |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5369899B2 (en) * | 2009-05-27 | 2013-12-18 | 株式会社Ｉｈｉ | Burner |
-
2021
- 2021-06-30 CN CN202110735911.9A patent/CN113277760B/en active Active
Patent Citations (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB182034A (en) * | 1921-09-02 | 1922-06-29 | Kai Petersen | Improvements in and connected with furnaces adapted to burn various kinds of fuel |
| GB447996A (en) * | 1935-02-09 | 1936-05-29 | Gas Light & Coke Co | Improvements in or relating to gas governors |
| FR1441201A (en) * | 1965-07-23 | 1966-06-03 | Texaco Development Corp | Improvements to oil burners |
| US4206712A (en) * | 1978-06-29 | 1980-06-10 | Foster Wheeler Energy Corporation | Fuel-staging coal burner |
| GB8530734D0 (en) * | 1985-12-13 | 1986-01-22 | Peabody Holmes Ltd | Burner |
| CN1056518A (en) * | 1990-05-12 | 1991-11-27 | 张斯恒 | Combustion-supporting agent for fuel coal |
| CA2201578A1 (en) * | 1996-04-03 | 1997-10-03 | The Babcock & Wilcox Company | Rotated multi-cylinder air delivery port |
| WO2000061992A1 (en) * | 1999-04-09 | 2000-10-19 | Mcdermott Technology, Inc. | Tunneled multi-blade swirler/gas injector for a burner |
| WO2009034626A1 (en) * | 2007-09-12 | 2009-03-19 | Taiheiyo Cement Corporation | Cement kiln burner apparatus, and method for running the burner apparatus |
| CN101306425A (en) * | 2008-06-24 | 2008-11-19 | 卿富安 | Electrolytic manganese slag comprehensive utilization technique |
| WO2010016168A1 (en) * | 2008-08-08 | 2010-02-11 | 株式会社Ihi | Burner |
| KR20110136199A (en) * | 2010-06-14 | 2011-12-21 | 한국에너지기술연구원 | A burner structure of the kiln furnace for cement |
| CN102809151A (en) * | 2012-08-23 | 2012-12-05 | 上海三融环保工程有限公司 | Oxygen-deficient combustion denitration combustor arranged in cement decomposing furnace |
| CN103075729A (en) * | 2012-12-10 | 2013-05-01 | 傅宁芳 | Cement rotary kiln coal powder burner with oxygen-enriched micro-oil ignition device |
| CN104696953A (en) * | 2013-12-07 | 2015-06-10 | 黄冈圣嘉高新机电设备有限公司 | Blade angle adjustable four-channel whirl pulverized coal burner |
| CN203687028U (en) * | 2014-01-20 | 2014-07-02 | 淄博科邦热工科技有限公司 | Combined flow field decomposing furnace burner |
| CN104555947A (en) * | 2015-01-28 | 2015-04-29 | 重庆市淡水河谷矿业有限公司 | Method and system for recovering electrolytic manganese slag |
| CN105130217A (en) * | 2015-07-21 | 2015-12-09 | 湖南省小尹无忌环境能源科技开发有限公司 | Method of producing ecological activated slag through treatment on electrolytic manganese residue in vertical kiln factory |
| CN105217580A (en) * | 2015-09-18 | 2016-01-06 | 花垣县强桦矿业有限责任公司 | A kind of electrolytic manganese residues high temperature desulfurizing enriched flue gas prepares the method for sulfuric acid |
| CN205746817U (en) * | 2016-06-15 | 2016-11-30 | 辽宁春成矿山机械制造有限公司 | Spiral coal powder burner secondary wind adjustment of blade angle device |
| CN206683420U (en) * | 2017-04-07 | 2017-11-28 | 中材株洲水泥有限责任公司 | A kind of hypoxemia flameless combustion nitrogen rejection facility for cement kiln tail smoke-box |
| CN107474862A (en) * | 2017-08-29 | 2017-12-15 | 太原理工大学 | A kind of civilian clean coke and its processing method |
| KR20200104177A (en) * | 2019-02-26 | 2020-09-03 | 두산중공업 주식회사 | Turbine vane and turbine blade and gas turbine comprising the same |
| CN110981231A (en) * | 2019-12-27 | 2020-04-10 | 湖南省小尹无忌环境能源科技开发有限公司 | Equipment and method for cooperatively treating electrolytic manganese slag on basis of dry-process rotary kiln cement production line |
| CN111594872A (en) * | 2020-04-13 | 2020-08-28 | 南京航空航天大学 | Deformable swirler air flow distribution intelligent adjusting system and method |
| CN112066361A (en) * | 2020-09-04 | 2020-12-11 | 金丽颖 | Wet dust-removing energy-saving coal-fired boiler |
| CN112830699A (en) * | 2021-02-24 | 2021-05-25 | 北京科技大学 | Cement admixture, preparation method and application |
| CN113277760A (en) * | 2021-06-30 | 2021-08-20 | 崇左南方水泥有限公司 | Method and system for cooperatively treating electrolytic manganese slag in cement kiln |
Non-Patent Citations (1)
| Title |
|---|
| Preparation of Geopolymer Using Electrolytic Manganese Residue;Zhao,R et al;《TESTING AND EVANLUATION OF INORGANIC》;第130页 * |
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