303 results about "Lime kiln" patented technology

The invention relates to the technical field of lime kiln control, and discloses a lime kiln partition intelligent temperature control system and a storage medium, and the system comprises a data collection unit which is used for collecting state data of each region of a lime kiln; the working condition recognition unit recognizes working conditions based on the state data; the temperature control unit is provided with a PID (Proportion Integration Differentiation) control strategy and a prediction control strategy, and the opening degrees of the fuel regulating valves and the air regulating valves in different areas in the lime kiln are calculated according to the corresponding control strategies selected on the basis of working conditions; the discharging control unit is provided with a balance control strategy, the balance control strategy obtains the current discharging speed through the current productivity of the lime kiln and the material level height in the lime kiln, and the execution unit correspondingly controls the lime kiln according to the control quantity. The method effectively solves the problems of difficulty in multi-area coordination, poor working condition adaptability, high energy consumption and the like in a traditional control mode, and has the remarkable advantages of improving the temperature control precision, ensuring the production stability and reducing the energy consumption.

The invention discloses a lime kiln monitoring system based on multi-source data dynamic fusion, which is characterized by comprising a thermal imager, an infrared sensor, a pressure sensor, a gas analyzer and an edge computing node, the edge computing node is configured with a Raspberry Pi platform and an LSTM neural network accelerator and is used for executing multi-source data preprocessing and feature compression, and the Raspberry Pi platform and the LSTM neural network accelerator are connected with the thermal imager. The system also comprises a working condition analysis system, and the working condition analysis system comprises a ring formation prediction model based on ST-GCN, a combustion optimization model based on DDPG, and an anomaly detection model based on an isolated forest and automatic encoder hybrid model. The invention aims to solve the limitation of a traditional monitoring system, realize real-time monitoring and accurate control, improve the equipment health management and predictive maintenance capability, optimize waste heat recovery and energy utilization, and enhance man-machine interaction and operation convenience.

The invention relates to the technical field of industrial environmental protection, in particular to a double-hearth lime kiln low-emission collaborative dust removal system and a control method. The control method comprises the steps that a flue gas sensing module collects real-time flue gas parameters and kiln body working condition data; the working condition linkage regulation and control unit dynamically adjusts operation parameters of the dust removal equipment through a fuzzy PID working condition matching algorithm; the regional collaborative dust removal assembly performs differential dust removal according to flue gas characteristics and treatment requirements of different dust raising points, and flue gas flow guide is performed through a double-hearth time sequence valve group during kiln body switching; the noise elimination and vibration isolation cooperation unit adjusts the noise elimination amount and the vibration isolation damping according to the rotating speed of the draught fan and controls noise and vibration. The tail gas deep purification unit evaluates the dust removal state through a flue gas and dust coupling model, carries out deep treatment on the dedusted tail gas and controls the tail gas emission concentration; the anti-blocking optimization unit carries out cooperative anti-blocking through dynamic rapping and airflow purging based on historical operation data and real-time working conditions. Therefore, the problems of poor dust removal stability, high operation energy consumption and the like in the prior art are solved.

The invention relates to the technical field of metallurgical automation control, and particularly discloses a method for applying a two-stage process control technology to automatic combustion of a lime kiln, an automatic combustion control system of the lime kiln comprises data acquisition and two-stage process control, the data acquisition is realized through Kepware, and first-stage PLC data is acquired and stored in a database table; the set value of the secondary process control calculation is stored in the database table and is issued to the primary PLC through the Kepware; the preheater center temperature presetting module controls the center temperature of a preheater by adjusting the opening degree of a coal gas adjusting valve, and the center temperature of the lime kiln preheater is automatically controlled through fuzzy control, case reasoning, a Bang-Bang controller and rule operation. Automatic combustion of the lime kiln is achieved, the kiln temperature, the kiln pressure and the discharging temperature of the lime kiln are accurately controlled within the set range, reasonable matching of pulverized coal, coal gas and air is achieved through case-based reasoning, energy is saved, consumption is reduced, and labor intensity is relieved.

The utility model discloses a carbon-rich lime kiln production system which comprises a kiln body and a kiln cavity, the kiln cavity comprises a calcining chamber, a carbon cooling chamber, a water cooling chamber and an oxygen cooling chamber which are sequentially connected in series from top to bottom; a carbon dioxide injection mechanism is arranged at the lower part of the carbon cooling chamber; a water vapor injection mechanism is arranged at the lower part of the water cooling chamber; and an oxygen injection mechanism is arranged at the lower part of the oxygen cooling chamber. A single air or carbon dioxide cooling structure independently adopted by a traditional lime kiln cooling section is replaced with a multi-medium multi-stage cooling structure, CO2 enrichment is achieved, meanwhile, the lime cooling effect can be guaranteed and improved, and the quality of lime products is guaranteed; and the difficulty of capturing and recycling the carbon dioxide in the subsequent lime kiln flue gas can be greatly reduced. The device has the advantages of simple structure, easiness in operation, flexibility in adjustment, low investment cost and the like, and realizes effective compatibility of good carbon enrichment effect and good lime product quality.

The disclosure herein sets forth processes and compositions for producing carbonated materials comprising calcium carbonates through a mechanochemical process. The present disclosure concerns the production of calcium carbonate by sequestrating CO2. Certain processes herein include providing alkaline-rich mineral materials that include carbonatable solid wastes such as lime kiln dust, cement kiln dust, and coal combustion residues, and simultaneously fractioning the alkaline-rich mineral materials, while contacting the alkaline-rich mineral materials with a CO2-containing gas in carbonation reactor at low temperature and ambient pressure. In some embodiments, the alkaline-rich mineral materials are partially carbonated before being used in the processes disclosed herein. After contacting the alkaline-rich mineral materials with a CO2-containing gas in carbonation reactor at low temperature and ambient pressure, solid calcium carbonate is produced. In aqueous reactors, the solid calcium carbonate is filtered from a solution in which it precipitated, and the remaining solution includes hydroxide as well as alkaline metal ions. The solution filtered from the solid calcium carbonate can be sequentially contacted with a CO2-containing gas stream to precipitate additional calcium carbonate. The carbonated materials formed from these processes can be used in the form of a slurry, as a moist powder, as a dried powder, as a reactive filler or as a supplementary cementitious material in a mixture that is used to make concrete.

The utility model relates to a pulverized coal and coal gas co-combustion device for a Merz double-chamber lime kiln, and belongs to the technical field of lime calcination equipment in the metallurgical industry. According to the technical scheme, the device comprises a coal gas access pipe (1), a pulverized coal access pipe (2), a spray gun flange (3), a double-pipeline parallel combined spray gun pipe (4), a kiln shell (9) and an elbow (10), the coal gas access pipe (1) and the pulverized coal access pipe (2) are fixed to the kiln shell (9) through the spray gun flange (3), and the coal gas access pipe (1) and the pulverized coal access pipe (2) are transversely arranged up and down; the double-pipeline parallel combined spray gun pipe (4) consists of two pipelines which are vertically arranged in parallel, the upper ends of the two pipelines are respectively connected with the coal gas access pipe (1) and the pulverized coal access pipe (2) through an elbow (10), the lower ends of the two pipelines extend into a kiln to form a spray gun opening, and a cavity between the two pipelines is filled with a wear-resistant material. The pulverized coal and coal gas dual-fuel combustion device has the advantage that the purpose of pulverized coal and coal gas dual-fuel combustion is achieved.

The invention discloses a lime kiln flue gas recovery system and a flue gas recycling method in iron and steel smelting, and belongs to the technical field of iron and steel smelting resource recycling. The system comprises a lime production system, a fly ash utilization system and a preheated flue gas utilization system, the lime production system communicates with the fly ash utilization system and the preheated flue gas utilization system, the lime production system conveys fly ash flue gas to the fly ash utilization system, and the lime production system conveys preheated flue gas to the preheated flue gas utilization system; and the preheated flue gas utilization system conveys fuel to the lime production system through the fly ash utilization system. According to the invention, flue gas and substances and energy derived in the flue gas recycling process are fully utilized by adopting abundant flue gas recycling means, so that the emission of available substances and energy is reduced to the greatest extent, and the flue gas generated in the lime production process and the substances and energy derived in the flue gas recycling process have higher utilization rate; the energy consumption is obviously reduced, the waste is reduced, and the flue gas pollution is reduced.

The lime kiln lining structure comprises a kiln top lining and a kiln body lining, and the kiln body lining comprises a first refractory brick layer, a second refractory brick layer, a first heat insulation layer, a second heat insulation layer and a third heat insulation layer which are sequentially arranged from inside to outside. Contact surfaces between two adjacent bricks in the first refractory brick layer are in concave-convex fit and are in sealed connection; the strength of the kiln top lining is higher than that of the first refractory brick layer, the second refractory brick layer, the first heat insulation layer, the second heat insulation layer and the third heat insulation layer, and the kiln top lining extends downwards to form a reinforcing part; kiln protecting plates are arranged on the inner side face of the kiln top lining and the upper side surface of the side, away from the second refractory brick layer, of the first refractory brick layer. The stability of the lime kiln lining can be enhanced, and the service life of the lime kiln can be prolonged; meanwhile, the heat preservation performance of the lime kiln can be enhanced, and heat loss is reduced.

The invention discloses a method for sequestration of carbon by using strong brine wastewater of a steel plant and a used device, and belongs to the technical field of tempering co-production process production. The method comprises a sodium carbonate production process I and an ammonium chloride production process II which form a cycle; raw materials NH3, salt NaCl and gas carbon dioxide are continuously added into the circulating system, and meanwhile sodium carbonate and ammonium chloride products are continuously produced; the raw material carbon dioxide comes from steel mill blast furnace top gas, steel rolling heating furnace tail gas or lime kiln tail gas; the raw material salt NaCl comes from concentrated salt wastewater of a steel mill; the raw material NH3 is from a byproduct coke oven gas generated in the production process of a steel enterprise and a coking plant. According to the method, sodium carbonate is prepared by fully utilizing three wastes, the situation that soxhlet and Hou's alkali production is adopted in the traditional alkali production industry to damage natural ecology and generate a large amount of waste gas, waste water and waste residues is broken, and double protection of resource recycling and environment is realized.

The invention relates to the technical field of lime kiln combustion control, and discloses a lime kiln combustion control method which comprises the following steps: acquiring lime kiln temperature data, and constructing a lime kiln temperature field; analyzing temperature deviation based on the temperature field, and judging whether a temperature abnormal region exists; when no temperature abnormal area exists, working condition parameters and environment parameters are collected, and the air-fuel ratio is calculated according to the working condition parameters; the environment parameters and the air-fuel ratio are input into a fuzzy control strategy, and adjustment control parameters are obtained through operation; smoke components generated in the combustion process are collected, heat efficiency is calculated according to component analysis, and whether the heat efficiency reaches the standard or not is judged; when the air-fuel ratio does not reach the standard, parameter self-learning is carried out on the fuzzy control strategy, the fuzzy control strategy is updated again, the air-fuel ratio is calculated again, and the control parameters are adjusted; combustion parameters can be adjusted in real time, heat efficiency is improved, uniformity of a temperature field in the kiln is improved, combustion control precision and energy utilization efficiency are improved, and the phenomenon of underburning or overburning is effectively reduced.

The invention relates to the technical field of environmental protection equipment, in particular to a double-chamber lime kiln tail gas dust multi-stage synergistic trapping device which comprises a cyclone dust collector, a condensation dehumidification unit and a graded filtering unit which are sequentially connected through a pipeline. The condensation dehumidification unit comprises a condensation dehumidification box, a refrigeration coil arranged in a snake shape is arranged in the condensation dehumidification box in the horizontal transverse direction, and the water inlet end and the water outlet end of the refrigeration coil penetrate through the side wall of the condensation dehumidification box and extend to the outer side; the graded filtering unit comprises a filtering box, a first filtering net, a second filtering net, a third filtering net and a fourth filtering net are transversely and sequentially arranged in the filtering box in the tail gas flowing direction, and a gas outlet pipe is arranged at the position, close to the fourth filtering net, of the filtering box; the problems of hardening, corrosion and the like of the filter bag caused by high humidity are solved, the stable proceeding of the subsequent filtering process is ensured, the service life of a filtering part is prolonged, and the maintenance cost and the replacement frequency of equipment are reduced.

The utility model discloses a system for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, which is characterized in that the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.

The utility model relates to a single-chamber lime shaft kiln with a central burner, and belongs to the technical field of kiln chamber structures of lime kilns. Comprising a furnace body (1) and a central burner (8), the outermost layer of the furnace body (1) is of a steel plate structure, the interior of the furnace body (1) is a lime kiln chamber built by refractory materials, the furnace body (1) is sequentially provided with a preheating section (3), a calcining section (6) and a cooling section (9) from top to bottom, an inner cavity of the preheating section (3) is of a straight barrel type structure, and inner cavities of the calcining section (6) and the cooling section (9) are of a big-end-down circular truncated cone type structure. And the central burner (8) is arranged at the central position of the bottom of the furnace body (1) and is of a thin circular truncated cone structure with a small upper part and a large lower part. The device has a simple structure, is convenient to manufacture, can reduce the formation of suspended materials of the lime kiln, prolongs the normal operation time of the lime kiln, can improve the yield of the lime kiln, ensures the good operation of the lime kiln, and improves the production benefit of the lime kiln.

The application provides a heat comprehensive utilization system based on a lime kiln and a combustion beam, belongs to the technical field of calcining equipment, and comprises a beam body, a cooling oil circulation pipeline, a steam pipeline and a combustion air pipeline; the cooling oil circulation pipeline is in communication with an oil cooling cavity. A fan is arranged on the combustion air pipeline, the fan can make gas flow to form an air flow; the steam pipeline is in communication with a gas cooling cavity, a steam valve is arranged between the steam pipeline and the gas cooling cavity, the steam pipeline further has a tempering branch in communication with a hollow cavity, and a tempering valve is arranged on the tempering branch; the combustion air pipeline is in communication with the gas cooling cavity; a combustion valve is arranged between the combustion air pipeline and the gas cooling cavity, the combustion air pipeline further has a combustion branch in communication with the hollow cavity, and an air inlet valve is arranged on the combustion branch. The heat comprehensive utilization system based on the lime kiln and the combustion beam provided by the application realizes energy saving to the maximum by means of liquid and gas collaborative cooling.

A bottom seal head is fixedly mounted on a bottom plate of a tower body and inclines towards the bottom of the tower body by 3 degrees, and a washing liquid outlet is formed in the lower end of the bottom seal head, so that washing liquid can be discharged conveniently without residual liquid; the gas distributor is arranged at the middle lower part of the tower body, is provided with a side lower opening and is fixedly supported at one end of the tower body; a washing liquid inlet is formed above the anti-blocking tower tray, and an impingement plate is arranged at the part, entering the tower body, of the washing liquid inlet, so that washing liquid is prevented from washing tower internals to cause damage; the blade type demister is mounted above the anti-blocking tower tray, the upper part of the blade type demister is connected with the tower body through an upper sealing plate, and the lower part of the blade type demister is connected with the tower body through a lower sealing plate; a spraying and flushing device is arranged in front of the blade type demister, so that the blade type demister is prevented from being blocked by dust; a downcomer is arranged at the bottom of the blade type demister, so that liquid drops intercepted by the blade type demister flow onto the anti-blocking tower tray. The utility model has the characteristics of anti-clogging, efficient cooling and dust removal.

The utility model relates to the technical field of lime kilns, and discloses a lime kiln tail gas filtering and dust removing device which comprises a smoke exhaust pipe. According to the lime kiln tail gas filtering and dust removing device, the device is installed at a designated position, the T-shaped frame is placed in the T-shaped groove and pressed, when the T-shaped frame moves downwards, the T-shaped frame is fixed in the T-shaped groove through the fixing assembly, smoke dust is filtered through the filter screen, when the filter screen is contaminated with much dust, the T-shaped frame is released through the fixing assembly, and the T-shaped frame is fixed through the T-shaped groove. A reciprocating screw rod of the replaced T-shaped frame is rotated, the reciprocating screw rod is matched with a sliding rod to enable a moving plate to do reciprocating motion in the vertical direction, the moving plate drives a cleaning brush to move, and therefore one side of the filter screen is cleaned. And meanwhile, the production cost is saved, the filter screen can be cleaned easily, and actual application and operation are facilitated.

The invention discloses a furnace bottom sealing and bearing structure of a lime kiln and other roasting kilns and a construction method, and relates to the technical field of construction of furnace bottom structures of lime kilns and other roasting kilns. According to the invention, the furnace bottom bearing beam transmits the received force to the upper surface of the reinforced concrete ring beam through the bearing inclined strut; the furnace wall ring beam transmits received force to the upper surface of the reinforced concrete ring beam through the supporting columns, the furnace bottom sealing steel shell, the embedded iron and the like, sealing and consolidation force transmission are completed through a secondary pouring ring, fatigue damage of the furnace bottom sealing steel shell is avoided, a furnace body can resist typhoon of more than 17 levels or 9-degree seismic intensity, and the service life of the furnace body is prolonged. And meanwhile, the sealing capacity of the furnace body exceeds 80 kPa. In addition, each large force is dispersed to the four sealing force transmission systems to be borne together and cooperate with one another, so that the maximum load value of each sealing force transmission system under the special structure condition is reduced, the sealing bearing reliability is improved through the simple structure, and meanwhile investment is saved.

The utility model relates to the technical field of equipment shells, in particular to a dustproof shell of lime kiln temperature control equipment, which comprises a fixed seat, a limiting block is fixedly connected to the surface of the fixed seat, a front plate is movably connected to the upper surface of the fixed seat, a control panel is arranged on the surface of the front plate, and sliding columns are arranged at two ends of the front plate. A side plate is movably connected to the upper surface of the fixing base, sliding grooves are formed in the two ends of the side plate, fixing bolts are movably connected to the two ends of the surface of the side plate, an air inlet structure is arranged on the surface of the side plate, and an air outlet is formed in the surface of the side plate. The air inlet structure is arranged, the filter screen can shake along with rotation of the fan, dust on the filter screen is shaken down, manual disassembly and cleaning are not needed, all components are connected through the sliding grooves and the fixing bolts, assembly and disassembly are convenient, and applicability is good.

The utility model discloses a lime kiln burner nozzle structure which comprises a connecting pipe, a nozzle body is arranged on the connecting pipe, a connecting port is arranged on the connecting pipe, the nozzle body is connected with the connecting port in an inserted mode, the nozzle body is connected with the connecting pipe through a flange, a sealing ring is arranged between the nozzle body and the connecting pipe, and the nozzle body is connected with the connecting pipe through a flange. A filtering assembly is arranged on the spray head body, a collecting box is arranged on the spray head body, and the filtering assembly and the collecting box are correspondingly arranged. By arranging the structures such as the filter plate and the like, the filter plate can effectively intercept solid particles in fuel or air and prevent the solid particles from entering the nozzle during use, so that the occurrence of nozzle blockage is reduced, the service life of the nozzle is prolonged, the maintenance frequency and cost are reduced, the cleanness of the fuel and the air is ensured, and the service life of the nozzle is prolonged. And mixing of fuel and air is optimized, combustion is more sufficient, fuel waste is reduced, and the operation cost is reduced.

The utility model discloses a device for preparing calcium carbonate and calcium sulfate from desulfurized fly ash through wet carbon sequestration. Comprising a lime kiln, a lime digestion and emulsification tank, a leaching tank, a first filtering unit, a second filtering unit, a third filtering unit, a fourth filtering unit, a purification reaction kettle, a carbonization and oxidation reaction kettle, a light calcium synthesis reaction kettle, a calcium carbonate synthesis reaction kettle, a common calcium carbonate drying unit, a calcium sulfate drying unit and an ammonia chloride solution buffer tank, the first recovery tank is used for collecting ammonia gas escaped from the leaching tank, the first filtering unit, the purification reaction kettle, the second filtering unit, the third filtering unit and the calcium sulfate synthesis reaction kettle and supplying the ammonia gas to the light calcium synthesis reaction kettle. The ammonia gas is used for adjusting the PH, so that carbon dioxide is dissolved in water to form carbonic acid, and carbonate reacts with calcium ions to form calcium carbonate. And the escaped ammonia gas is collected and reused. The ammonia gas utilization rate is improved. And the consumption of ammonia gas is reduced.

The device comprises a flash replacement kiln, the flash replacement kiln comprises a powder-fuel gas heat exchanger and an oxygen-powder bin, slag sludge is ground by a Reynolds mill after moisture is evaporated and falls into the oxygen-powder bin, oxygen powder and fuel gas in the kiln are mixed and then subjected to fuel gas combustion, powder vapor is heated to 550-650 DEG C and subjected to a replacement reaction, slaked lime powder is generated, and the slaked lime powder is discharged into the flash replacement kiln. And the powder-fuel gas heat exchange tube is frequently impacted to reduce the temperature to 80-90 DEG C, CO2-enriched gas flow enters the drying kiln and the CO2-enriched gas-oxygen heat exchanger to be cooled, and part of condensed water is separated out by the cyclone dehydrator and sprayed into the kiln. The particle size of the limestone powder is smaller than 200 meshes, the temperature of an upper inner cavity is 550-650 DEG C, and the steam supply coefficient is 1.03-1.05. The limestone slag sludge can be recycled. The method is low in investment, high in waste heat recovery rate, low in emission, free of burning reduction of products, long in service life and large in carbon capture potential, and the key management object lime kiln device of the national two-high project is prevented from being used.

The invention relates to the technical field of lime cooling, and discloses a continuous lime cooling method and system for double-loop waste heat recovery. The method comprises the following steps: acquiring an initial temperature and a mass flow parameter of high-temperature lime at an outlet of a lime kiln, and extracting a target temperature threshold and a heat exchange medium basic parameter in a cooling process standard from a preset database; then, a double-loop waste heat recovery path comprising a main cooling loop and an auxiliary recovery loop is constructed, and based on the difference value between the initial temperature and the target temperature, the flow speed of the first type of media in the main loop and the flow of the second type of media in the auxiliary loop are dynamically regulated and controlled; the real-time temperature of the high-temperature lime in the main loop, the outlet temperature of the first type of media and the inlet and outlet temperature data of the second type of media in the auxiliary loop are collected in real time at the same time; and finally, judging whether the high-temperature lime meets a cooling standard corresponding to the target temperature or not according to the collected temperature data and a preset heat balance relationship. According to the method, efficient cooling and waste heat recovery are achieved.

The invention discloses a material distribution structure of a lime kiln or other roasting kilns and a material distribution method of the material distribution structure, and relates to the technical field of material distributors. Spiral multi-ring material distribution is achieved through the variable-speed spiral material distributor, material distribution in the kiln is more uniform, and compared with a previous rotary chute dip angle adjusting structure, the variable-speed spiral material distributor is simpler in structure and low in manufacturing cost and maintenance difficulty; compared with an idle spiral distributor, the distributor can uninterruptedly distribute materials in real time, the efficiency is obviously improved, and the distributor is suitable for the material distribution requirements of large-yield and large-diameter kilns; the upper portion and the lower portion of the multi-pipe distributing device are filled with normal-temperature materials, the multi-pipe distributing device has a material sealing function, trace normal-temperature air moves downwards, it is guaranteed that the height of the material level in the furnace is constant, meanwhile, the area corresponding to the height of the multi-pipe distributing device is a stable free space and is in a micro-negative-pressure state, stable distribution of airflow in the furnace is facilitated, and the energy consumption is reduced. Meanwhile, the multi-pipe distributing device is protected from being damaged by high temperature, the equipment structure is simplified, debugging, maintenance and replacement are convenient, and reliability and safety are improved.

The utility model belongs to the technical field of desulfurization and denitrification equipment, and particularly relates to a lime kiln ultra-low emission desulfurization and denitrification device which comprises a reaction tower, the reaction tower comprises an upper tower body and a lower tower body, a denitrification mechanism is fixedly mounted in the upper tower body and comprises a first liquid inlet pipe, and a second liquid inlet pipe is fixedly mounted in the lower tower body. A first liquid inlet pipe is fixedly mounted in the lower tower body, a plurality of first flow dividing pipes are fixedly mounted on the two sides of the first liquid inlet pipe, a plurality of first atomizing nozzles are fixedly mounted at the bottoms of the first flow dividing pipes, a desulfurization mechanism is fixedly mounted in the lower tower body and comprises a second liquid inlet pipe, and second flow dividing pipes are fixedly mounted on the two sides of the second liquid inlet pipe; through the structural design of the upper tower body, the lower tower body, the denitration mechanism and the desulfurization mechanism, the function of reducing mutual interference among purification processes is realized, so that the operation conditions of denitration and desulfurization can be optimized in a targeted manner, the overall efficiency of desulfurization and denitration is improved, and meanwhile, secondary pollutants caused by improper mixing are reduced.

The invention relates to a method for removing lime mud depositions (30) from internal surfaces (10a) of a rotary lime kiln (10), wherein the lime mud is lime mud formed in pulp production and in which rotary lime kiln (10) the lime mud is heated in the interior space of the rotary lime kiln (10) with an internal heater to calcinate the lime mud, and wherein the method comprises method steps of -providing an external temperature control arrangement (20) being capable to change the internal surface temperature of the rotary lime kiln (10) at least in one location from outside the interior space (12) of the rotary lime kiln (10), -changing the internal surface temperature of the rotary lime kiln (10) at least in one location by the external temperature control arrangement (20) to remove lime mud depositions (30) from the internal surface (10a) at the at least one location, -increasing the temperature at the internal surface at least to 800°C, preferably at least to 900 °C. The invention relates also to an apparatus for removing lime mud depositions (30) from internal surfaces (10a) of a rotary lime kiln (10).

The utility model belongs to the technical field of oxygen-enriched combustion, and particularly relates to a lime kiln oxygen-enriched combustion oxygen concentration adjusting device which comprises a gas mixing bin, an oxygen generator and an air blower. An oxygen conveying pipe and an air conveying pipe are arranged on the upper side and the lower side respectively, air inlet buckets are fixedly connected to the ends, close to the gas mixing bin, of the oxygen conveying pipe and the air conveying pipe, a plurality of arc-shaped blades are fixedly connected to the inner surfaces of the air inlet buckets, and the diffusion area of oxygen and air entering the gas mixing bin is increased; the oxygen concentration of the mixed air after stirring and mixing is more uniform, so that the oxygen concentration measurement is more accurate, and the oxygen concentration adjustment failure of the device is avoided.

The present invention relates to a special corundum composite brick and a preparation method thereof, belonging to the technical field of refractory materials. The special corundum composite brick comprises the following raw materials: 50-70 parts of corundum mixture, 10-20 parts of fused mullite powder, 4-7 parts of alumina powder, 0.5-1.5 parts of fused magnesia, 10-15 parts of zircon sand, 10-15 parts of silicon carbide powder, 0.5-1.5 parts of silicon powder, 5-7 parts of sillimanite powder, 5-8 parts of andalusite, and 3-4 parts of binder; the corundum mixture is compounded by tabular corundum, white corundum and brown corundum with a weight ratio of (0-1):(1-3):(3-5). In the special corundum composite brick provided by the present invention, the raw materials cooperate with each other, and the performance of the obtained special corundum composite brick is significantly improved under the joint action. It can be widely applied to various parts of the whole cement rotary kiln line, various parts of the whole lime kiln rotary kiln line and the requirements under different usage scenarios, and has a wide range of uses.

The utility model discloses a denitration device for a lime shaft kiln, which structurally comprises a main body unit and a denitration unit, the main body unit comprises a tank body, a filter plate and a shunt pipe are arranged in the tank body, and a spray head is mounted on the shunt pipe; the supporting unit comprises a water storage tank and a medicament tank, a top cover is arranged on the water storage tank and the medicament tank, and a fixing frame is detachably connected to the top cover through bolts. When the device is used, flue gas enters the fixed box through the gas inlet, the temperature of the flue gas is sensed through the temperature sensor, and when the temperature of the flue gas is too high, cold water in the water storage tank is pumped out through the first water pump and conveyed into the snake-shaped copper pipe through the water conveying pipe, so that heat in the flue gas is taken away, and the flue gas is cooled; circulating cold water enters the water storage tank through the drainage pipe to circulate, the cooled flue gas is guided into the tank body to be filtered and denitrated, cooling is conducted in a cold water circulation heat exchange mode, heat in the flue gas can be rapidly absorbed, the temperature of the flue gas is reduced, and the situation that a filter screen is burnt or a spray head structure is damaged due to overheated flue gas is prevented.

The utility model discloses a system for reducing boiler nitrogen oxide, and relates to the field of nitrogen oxide purification. Comprising a gas-fired boiler, a lime kiln, a dust remover, a multi-pipe cooler, a variable-frequency induced draft fan, a circulating fan and a gas suspension fan, a chimney outlet of the lime kiln is connected with the dust remover through a flue gas return pipe, the dust remover is connected with the multi-pipe cooler through a pipeline, the multi-pipe cooler is connected with the circulating fan, and the circulating fan is connected with one end of a branch pipe. A first fork of the branch pipe is connected with the air suspension fan, the air suspension fan is connected with a driving air system of the lime kiln, a second fork of the branch pipe is connected with a lime cooling air system of the lime kiln, the gas-fired boiler is connected with the variable-frequency induced draft fan through a pipeline, and the variable-frequency induced draft fan is connected with the flue gas return pipe through a pipeline. The device is used for solving the problem that nitric oxide exceeds the standard in the production process of the calcium carbide furnace tail gas gas-fired boiler, and powerful technical support and guarantee are provided for green development of the calcium carbide industry and effective utilization of resources.