51 results about "Calcifuge" patented technology

The invention discloses a method for producing cement clinkers from dried carbide slag completely instead of natural limy materials, which relates to the field of building materials. Firstly, three auxiliary materials (including sand rock, coal ash and sulfur acid residue) are compounded, pulverized and sieved, and the fine powder is fed into a dryer. Then, the carbide slag with a water content less than or equal to 12% is fed into the dryer, and undergoes intensive heat exchange with the hot flue gas at the charge side, realizing complete drying and mixture. The crude material powder is fed into first-stage, second-stage and third-stage cyclone cylinders to undergo multiple suspension heat exchange with the hot flue gas, and then enter a rotary kiln for calcination. The hot flue gas inside the klin undergoes the heat exchange in a pipeline calciner and a wind pipe and then reversely flows into the third-stage, second-stage and first-stage third-stage cyclone cylinders, the dryer, a cyclone dust collector, a system fan and an airbox pulse bag-shaped dust collector sequentially, and the purified gas is discharged into the external atmosphere. The coal powder jets into the calciner at the charge side for further combustion, and the crude material powder undergoes decomposition reactions: Ca(OH)2-H2O+CaO. The clinker burned in the rotary kiln is cooled by a grate cooler and then delivered to a clinker storage room. In the invention, the waste carbide slag is completely dried by using the exhaust gas at the discharge side, and the heat consumption for clinker combustion is reduced by about 25%, thereby realizing energy conservation and exhaust reduction.

The invention provides a low nitrogen type decomposition furnace and a method for reducing the nitrogen oxide concentration in the clinker calcination process. The technical problems that in the cement line production in the prior art, the denitration treatment of flue gas corresponding to clinker production consumes a large amount of ammonia water, and the denitration cost is high are solved. Thedecomposition furnace comprises a furnace body, the furnace body comprises an upper pipe section, a middle pipe section, a lower pipe section and a cone pipe section from top to bottom in sequence; the lower pipe section is connected with an upper coal injection pipe for pulverized coal feed and a third air main pipe, and is connected with a low position material separation pipe for raw materialfeed; and the third air main pipe is connected with a lower pipeline of the furnace body, and the third air main pipe is further connected with a third air branch pipe. According to the low nitrogen type decomposition furnace and the method for reducing the nitrogen oxide concentration in the clinker calcination process, an intermediate product produced in the process of fuel combustion is used for denitration, no additional denitration reducing agent is used, the emission of flue gas pollutants can be fundamentally reduced, the amount of ammonia water consumed by flue gas denitration in a cement kiln can be reduced accordingly, so that the operation cost of denitration is reduced.

A method for producing active admixture materials by treating electrolytic manganese slag with a non-homogenization process, comprising the following steps: (1) continuously feeding electrolytic manganese slag into the kiln tail smoke chamber through an air lock feeding system; (2) adjusting minerals The raw material powder is preheated by the preheater system into the calciner, and then continuously sent into the kiln tail smoke chamber, and mixed with electrolytic manganese slag; (3) The mixture of electrolytic manganese slag and mineral adjustment material powder enters through the kiln tail smoke chamber In the rotary kiln, the kiln tail smoke chamber and the rotary kiln are further mixed and calcined at the same time to obtain cooked slag; (4) The obtained cooked slag is discharged from the kiln head of the rotary kiln into a grate cooler for cooling to obtain active admixtures. The invention utilizes the dry-process rotary kiln cement production line equipment equipped with an air lock feeding system, adopts a non-homogenization process to process the electrolytic manganese slag to produce active admixtures, does not need to dry and grind the electrolytic manganese slag, and can save a lot of energy consumption; effective use of silicon, aluminum, iron, calcium and calcium sulfate and other components in electrolytic manganese slag; avoiding environmental pollution by volatile pollutants; low production investment.

The invention discloses a cement decomposition furnace temperature control method based on BFCM-iWM fuzzy rule self-extraction. The method includes the steps that through analysis of the decompositionfurnace technology and on-site experience summarization, values related to the outlet temperature of a decomposition furnace are analyzed, and an outlet temperature control strategy of the decomposition furnace is determined; data in the operation process of the decomposition furnace is collected by inquiring an industrial field database; when the coal feeding amount of the decomposition furnaceis changed, elimination is conducted according to the condition and the 3 sigma criterion; the temperature deviation and the deviation change rate of the decomposition furnace and the domain range ofthe coal feeding increment of the decomposition furnace are determined after elimination; sample data is clustered by using a BFCM clustering method, and the credibility of the sample data is determined; a rule is extracted on the basis of the iWM method added with credibility; a fuzzy controller is built on the basis of the rule, and temperature control is achieved. According to the method, the rule is automatically extracted from the data by using the iWM method added with the data credibility, the subjectivity and limitation of manual rule making rule are avoided, and the accuracy and robustness of the rule are improved.

The invention discloses a system and a method for co-processing waste by utilizing industrial waste heat, and belongs to the technical field of co-processing waste. It includes a pre-disposal furnace and a clinker calcination system for burning and disposing of waste. The tertiary air from the grate cooler is introduced into the pre-disposal furnace, and the top of the pre-disposal furnace is connected to the upper end of the calciner through a flue gas channel. The pretreatment furnace is provided with an oxygen-enriched air inlet; the oxygen-enriched air inlet faces the main combustion area of ​​the pretreatment furnace and forms an included angle of 30°-45° with the level of the pretreatment furnace. The present invention adopts oxygen-enrichment to achieve an oxidative environment, allowing waste particles to be fully burned; and the excess oxygen-enriched gas is passed into the decomposition furnace through a flue gas pipeline, thereby providing favorable conditions for suppressing the production of sulfur dioxide in the decomposition furnace.

The invention relates to a method of using carbide slag to replace all limestone for calcining cement, which belongs to the inorganic non-metallic material technological field. The invention uses the carbide slag as the calcareous raw material and adopts the dry process pre-decomposition cement production technology out of kiln. The invention is characterized in that the carbide slag is used to replace the limestone in 100 percent for calcining the cement clinker, and the invention includes: firstly, the preheating and the pre-decomposition of the carbide slag: a cyclone preheater and a calciner system are adopted for the preheating and the pre-decomposition of the carbide slag green stock; the decomposition temperature of the carbide is 380-550 DEG C, and the outlet temperature of the calciner is 550-750 DEG C; secondly, the coal powder burning and the green stock decomposition: the coal powder and the green stock enter the calciner respectively through a distributor; the adding position and the adding amount of wind, materials and coal of the calciner are controlled; the coal powder is burned at the condition of 850 DEG C above; the green stock is decomposed; thirdly, the materials enter a rotary kiln to be calcined into the cememt clinker. The invention has the advantages of resource saving performance, little CO2 emission, low cost, circular economy, etc.

The application provides a method for quenching pyrolysis products, more specifically, the method for quenching pyrolysis products includes: supplying the discharge stream from the liquid decomposition furnace to the first quenching tower; The upper effluent stream of is supplied to the second quench tower; the effluent stream from the first gas decomposition furnace is supplied to the second quench tower; and the effluent stream from the second gas decomposition furnace is supplied to the second quench tower.

The invention provides a method for preheating and pre-combusting pulverized coal in the tertiary air duct of a cement precalcining kiln. A decomposition furnace is set between the rotary kiln and the suspension preheater as the second heat source of the system. A certain proportion of pulverized coal is sprayed into the wall of the tertiary air duct at a certain distance, so that the pulverized coal and the tertiary hot air enter the calciner together. Generally, pulverized coal is sprayed 5-10m away from the tertiary air inlet of the calciner. The pulverized coal sprayed into the tertiary air duct from the wall of the tertiary air duct is divided into two to four symmetrical injections. The ratio of the pulverized coal entering the tertiary air pipe to the pulverized coal directly entering the calciner is 2:8-3:7. The gas-solid ratio of pulverized coal entering the tertiary air duct is subject to the tertiary air temperature of the calciner reaching 950°C-1000°C. Generally, the first branch pipe is led from the pulverized coal air pipe to the calciner to the third air pipe.

The invention relates to a method for producing sintered material from organic raw materials (11), said method being carried out in a device comprising: cyclone preheater (1), rotary furnace (2), grate cooler (3), And wherein, the raw material (11) is preheated in the cyclone preheater (1), the preheated material is calcined and sintered in the rotary furnace (2), and the cooling air (4, 40) is blown in the grate cooler (3) Cooling the calcined material generates hot air. According to the invention, from upstream to downstream, the hot air is divided into three parts, according to the direction of progress of the material in the grate cooler, said three parts of hot air are at a decreasing temperature, respectively comprising at least The possible presence of a first air fraction (5) in the combustion zone of the precalciner used as combustion air, an intermediate second air fraction (6) larger than the required combustion air for energy generation and at a lower temperature The third air portion (7) is directed at least a portion (71) of the third air portion (7) towards said combustion zone of the device for use as combustion air together with said first air portion (5).

The invention discloses a self-denitrification system and process for zoned tissue combustion with a reduction furnace and a decomposition furnace. A reduction furnace is installed between the kiln tail smoke chamber and the decomposition furnace. The bottom of the calciner cone is connected to form a horizontally partitioned combustion environment with a central oxygen-rich zone and a peripheral low-oxygen zone on the calciner cross-section; The space inside the calciner below the upper branch pipe is the weak reduction zone, and the space inside the calciner above the upper branch pipe of the tertiary air is the burnout zone, forming a longitudinal gradient combustion environment combining strong reduction zone-weak reduction zone-burnout zone. The horizontal partition combustion environment is realized by the tertiary air entering vertically upward from the bottom center of the calciner, and the flue gas is realized by the spiral tangential rotating air entering from the side of the calciner; the vertical gradient combustion environment is realized by fuel graded feeding and tertiary air distribution. The present invention realizes self-denitrification through zoned organization combustion as a whole, and improves self-denitrification efficiency.

The invention relates to a method for preparing high-activity light-burned magnesia in a fixed bed-fluidized bed multi-fluid state, using magnesite with a particle size of 30-300 mm as raw material, and sending the magnesite to a fixed bed for calcining and decomposition through a feeding system The massive magnesite decomposes into smaller chunks and powders, and 10-80% of the magnesite undergoes a decomposition reaction, which is decomposed in an accumulation state; the material particles from the fixed bed calcining and decomposition furnace are passed through The pipeline is sent to the fluidized bed boiling state decomposition furnace, so that the material particles are in a boiling state, and the undecomposed magnesite can continue to decompose in the process of simmering in the fluidized bed boiling state decomposition furnace. This decomposition reaction is boiling state decomposition; completely The decomposed light-burned magnesia enters the cooling device through the pipeline along with the hot flue gas and is collected from the discharge port after being cooled. The material presents a multi-fluid combination in the whole process. This multi-fluid combination is conducive to the full progress of the decomposition reaction of magnesite, which can ensure that the decomposition rate of magnesite is greater than 99%, and the product quality is uniform and stable.

The invention discloses a calciner gradient combustion self-denitration system with an external ignition chamber, which belongs to the technical field of cement production and includes a calciner. The interior of the calciner sequentially forms a strong reduction zone, a weak reduction zone and a burnout zone from bottom to top. area, the calciner is provided with a calciner fuel feed port and a calciner raw meal lower feed port connected with the strong reduction area, and the calciner is provided with an upper calciner raw meal feed port connected with the weak reduction area, and the calciner is equipped with There is an upper tertiary air inlet connected to the burnout area, and it is characterized in that it includes an ignition chamber, the ignition chamber has a column cavity, the column cavity is provided with a volute, and the upper part of the column cavity is provided with an ignition chamber fuel feeder. The material port and the volute part are provided with the lower tertiary air inlet, and the volute part introduces the tertiary air entering from the lower tertiary air inlet into the column cavity along the direction tangent to the inner side of the column cavity, and the ignition chamber is close to the lower The tertiary air inlet is provided with the raw material feeding port of the ignition chamber, and the lower part of the column cavity is provided with the outlet of the ignition chamber, and the outlet of the ignition chamber communicates with the weak reduction zone of the calciner.