130 results about "Sludge incineration" patented technology

The invention discloses a method for recovering phosphorus through anaerobic digestion by adding sludge-based biochar, which comprises the following steps of: firing dewatered sludge serving as a raw material under an anaerobic condition to obtain carbonized carbon; or firing under an aerobic condition to obtain pyrolytic carbon, adding any sludge-based biochar obtained by firing into the hydrothermal dewatered sludge, and carrying out anaerobic digestion on the hydrothermal dewatered sludge; the hydrothermal dewatered sludge is obtained by performing hydrothermal pretreatment on dewatered sludge; and carrying out phosphorus recovery on the sludge-based biochar subjected to anaerobic digestion by utilizing a magnetic separation method. Compared with the traditional method for recovering the phosphate fertilizer from the sludge incineration ash, the recovery method disclosed by the invention is green and pollution-free, belongs to a sludge treatment mode of treating waste with waste, realizes effective combination of a heat treatment mode and a biological treatment mode, and has a good practical application value. Moreover, the prepared sludge-based biochar has the property of magnetism, so that the recovery rate of the subsequent blue iron ore is increased, and the separation difficulty and economic investment are reduced.

The invention relates to a high-gloss black decorative glass prepared from sludge incineration ash by an all-electric melting method. The high-gloss black decorative glass comprises the following raw material components in percentage by mass: 75-79% of fly ash, 5-7% of calcium carbonate, 9-10% of sodium carbonate, 5-6% of potassium alkali, 1-1.4% of boric acid, 0.03-0.04% of porous carbon, 0.06-0.08% of semi-coke powder, 0.16-0.22% of cobaltosic oxide, 0.1-0.2% of cerium dioxide, 0.04-0.06% of neodymium oxide, 0.5-0.7% of waste zircon brick powder and 0.03-0.05% of yttrium oxide. The dedusting ash is electrostatic dedusting ash collected by incineration of filtered sludge in a municipal sewage treatment plant, and belongs to hazardous waste; the porous carbon is rich in a hierarchical pore structure of sub-nano pores (0.5-1.0 nm). According to the method, a closed-loop production mode that waste is used for treating waste is constructed, high-added-value decorative materials are produced while energy consumption is reduced, and environmental protection investment is converted into economic benefits.

The invention provides a coal-based solid waste acid-activated cementing material and a preparation method thereof, and the preparation method comprises the following steps: fully crushing, calcining and ball-milling coal gangue, coal series kaolin and kaolin tailing slag to obtain a ball-milled material; grinding and sieving the sludge incineration ash to obtain screen underflow, and adding an extracting solution into the screen underflow to prepare an acid activator; mixing and stirring an acid activator and the ball-milled material to obtain neat paste; and carrying out pouring molding on the neat paste, and carrying out sealing maintenance to obtain the coal-based solid waste acid-activated gel material. The coal-based solid waste acid-activated cementing material prepared by the preparation method provided by the invention has good cementing property and mechanical property, and the preparation process is low in energy consumption, less in carbon dioxide emission, easily available in raw materials and low in price, so that the resource utilization of solid wastes is effectively realized; an engineering application foundation is laid for replacing cement on a large scale or preparing concrete for buildings, and the method can also be applied to soil remediation of contaminated sites.

The application discloses a process method for directly drying sludge by using hot flue gas of sludge incineration, and a process system used mainly comprises a sludge incinerator, a sludge dryer, a drying tower, a dust removal system, a flue gas condensing tower, a regenerative thermal incinerator 10, a wet deacidification tower, a cold flue reheater and a chimney. The sludge is dried by using the hot flue gas generated by the sludge incineration, the dried sludge is incinerated again, the flue gas waste heat is utilized and discharged, the synchronous disposal of the sludge drying and incineration is realized, the sludge dryer is a rotary gas flow bed dryer, the sludge does not need to be crushed, granulated, made into strips or atomized by a nozzle, and the types of equipment are simplified. By adopting partial flue gas backflow, the flue gas emission and waste heat loss are reduced; the sludge drying process is operated under high humidity airflow, the oxygen content is not increased in the drying process, and the possibility of sludge explosion in the drying process is reduced. The regenerative thermal incinerator is used for removing VOCs and CO, and the problem of flue gas exceeding the standard caused by the sludge drying is solved.

The invention discloses a sludge incineration ash treatment method based on mineralization reaction, a mineralization product and application, and belongs to the technical field of solid waste treatment and resource utilization. The method comprises the following steps: crushing and screening sludge incineration ash, carrying out acid leaching activation on the ash by using diluted hydrochloric acid, adjusting the pH value to 3-5, and filtering to obtain a pretreated ash solution; and carrying out mineralization reaction on the pretreated ash solution and CO2, and carrying out solid-liquid separation to obtain a carbonate mineralizer. The sludge incineration ash is used for replacing traditional natural minerals to serve as a CO2 mineralization reaction raw material, the purpose of treating waste with waste is achieved, calcium and magnesium ions in the ash are efficiently extracted through an acid leaching activation technology, heavy metal impurities are synchronously removed, and the problems of high raw material cost, large mining energy consumption and solid waste landfill pollution of a traditional mineralization technology are solved; the defects of an existing sludge incineration ash residue resource utilization method in the aspects of heavy metal solidification and harmlessness are overcome, the CO2 storage amount of a single ton of ash residues reaches 0.2-0.3 ton, and the cost is reduced by 40%-50%.

The invention discloses a sludge dewatering flocculant and a preparation method and application thereof.The sludge dewatering flocculant is a natural polymer modified corn straw powder flocculant, natural corn straw is smashed into powder to serve as a base material, and cationic groups are carried by the base material through alkalization and graft copolymerization; and the cation group is quaternary ammonium group methyl. The modified corn straw powder flocculant is used for conditioning municipal sludge, is beneficial to flocculation and dehydration of the sludge, is extremely good in solubility, can be easily and fully dispersed in the sludge, is extremely small in addition amount, and has the characteristics of environment friendliness and high efficiency; the biomass fuel is prepared by modifying the corn straws, so that the biomass fuel also has the advantages of high calorific value similar to that of the corn straws and the like, and subsequent sludge incineration disposal is facilitated. Municipal sludge is conditioned through the modified corn straw powder flocculating agent and dehydrated, the water content of an obtained sludge cake can be as low as 65%, and the specific resistance SRF of the sludge can be as low as 6.25 * 10 <-12 > m.kg <-1 >.

The utility model relates to the technical field of sludge treatment, in particular to a sludge incineration system capable of preventing high-temperature feeding blockage of sludge, which comprises an incinerator, a flue gas cooler, a bag-type dust collector and a chimney which are sequentially connected, a sludge feeding pipe is arranged at the top of the incinerator, and a sludge water-cooled jacket is sleeved outside the sludge feeding pipe. A sludge feeding pipe is inserted into the sludge feeding pipe, the sludge feeding pipe is connected with the sludge feeding pipe through a flange, a plurality of communicated vent holes are formed in the flange and the sludge feeding pipe, the outer ends of the vent holes are connected with a cooling air pipe, and cooling air introduced by the cooling air pipe is blown into a circular seam between the sludge feeding pipe and the sludge feeding pipe. An auxiliary material feeding pipe is arranged on the side face of the incinerator, and an auxiliary material water cooling sleeve is arranged outside the auxiliary material feeding pipe in a sleeving mode. Sludge is prevented from being heated and coked through double cooling of water cooling and air cooling.

This utility model discloses a mechanical cold-press sludge treatment device, including a sludge mechanical cold-press deep dewatering system, a dried sludge incineration waste heat recovery system, and a flue gas purification system; it includes a wet sludge storage silo, a primary sludge conveying pump, a sludge conditioning machine, a secondary sludge conveying pump, a sludge distributor, a sludge cold press, a sludge feeder, a dry sludge storage silo, a sludge feeder, a sludge incinerator system, a waste heat boiler system, an SNCR in-furnace denitrification system, an electrostatic precipitator, a dry deacidification tower, an activated carbon injection system, a bag filter, a lime-gypsum wet deacidification tower, a low-temperature SCR denitrification system, an induced draft fan, and a chimney; this utility model achieves sludge dewatering and drying at room temperature through mechanical cold-pressing technology to reach the conditions for self-sustaining combustion, and then incinerates the dried sludge through a bubbling circulating fluidized bed incineration, fully recovering the heat released from sludge incineration for power generation or heating, thereby realizing the resource utilization of sludge.

The invention relates to a sludge incineration treatment system, and belongs to the field of sludge treatment. Comprising a sludge feeding system, an incineration system, an ash delivery system and an ash circulation system. By means of the double-sleeve type ash feeding pipeline, the air feeding quality can be improved, the problem that the rear section of a traditional air feeding system is small in pressure and prone to blockage is solved, high-pressure blowing is matched, and the stability of a sludge feeding system is guaranteed. A wear-resistant protective sleeve is additionally arranged at the elbow of the ash conveying pipeline, so that normal operation of equipment is ensured. The sleeve type high-temperature protection pipe is additionally designed, so that the problem of pipeline breakage caused by thermal expansion is completely eradicated; through the design structure of the valve, the flashboard is prevented from being clamped due to the fact that ash residues are accumulated in the supporting plate or gaps. By designing a cooling water line of the cooler, the steam heat efficiency of the circulating fluidized bed boiler is ensured. And an ash circulating system is additionally arranged, carbon particles which are not completely combusted in ash are fed into the hearth again, and the fuel utilization rate is increased.

The invention relates to the technical field of sludge treatment, in particular to high-activity papermaking sludge incineration ash as well as a preparation method and application thereof. The preparation method of the high-activity paper mill sludge incineration ash comprises the following steps: S1, carrying out sectional type hot air drying on dewatered paper mill sludge, so that the water content of the sludge is reduced to 15-25%; s2, feeding the dried sludge into a circulating fluidized bed incinerator, and pyrolyzing the papermaking sludge at 450-550 DEG C under an anoxic condition; carrying out activated combustion on the pyrolysis product under the conditions of oxygen enrichment and superheated steam injection at the temperature of 650-750 DEG C; then carrying out short-time stabilizing treatment on ash particles generated by activated combustion at 850-950 DEG C, and quenching; and S3, the cooled ash is ground, and the high-activity paper mill sludge incineration ash is obtained. The high-water-absorption material is prepared from the sludge incineration ash, and efficient treatment and resource utilization of dredged soil, river and lake bottom mud and engineering slurry are achieved.

This application relates to the field of solid waste resource utilization technology, specifically disclosing a method for synthesizing lithium iron phosphate based on sludge incineration ash through electrocoagulation-lithiation. The method involves leaching sludge incineration ash with dilute sulfuric acid to obtain a phosphate-containing acid leachate, followed by purification with a cation exchange resin to remove multivalent metal impurities. Using the purified phosphate solution as the base electrolyte, a lithium source, electrolyte, and organic carbon source are added, and the pH is adjusted. An iron plate is used as the anode and an inert electrode as the cathode for electrocoagulation. Fe²⁺ dissolved at the anode co-precipitates with PO₄³⁻ and Li⁺ in the solution to form a LiFePO₄ precursor slurry. Finally, solid-liquid separation, washing, drying, and programmed temperature sintering are performed to obtain a carbon-coated lithium iron phosphate composite material. This application has the advantage of achieving high-value utilization of sludge incineration ash.

The embodiment of the invention provides a sludge drying and incineration treatment system, which comprises a sludge drying unit, a crushing and screening unit, a sludge incineration unit and a sludge incineration unit, wherein the sludge drying unit is used for reducing the water content of sludge through heat exchange and conveying the treated sludge to the crushing and screening unit; the crushing and screening unit crushes the sludge into a preset particle size range and then quantitatively conveys the sludge to the multi-fuel incineration unit; the multi-fuel incineration unit dynamically adjusts fuel combination and combustion-supporting parameters according to combustion working conditions and guides generated flue gas into the flue gas purification unit; and the flue gas purification unit purifies flue gas through a multi-stage treatment process and then discharges the flue gas. Through modular design and an intelligent control strategy, the system realizes efficient utilization of energy and deep purification of pollutants. The heat energy recovery mechanism of the drying unit greatly reduces the treatment energy consumption, the multi-fuel adaptation function of the incineration unit improves the operation stability, and the cascade treatment process of the flue gas purification unit ensures that the emission index is superior to the standard.

This invention discloses an environmentally friendly shale brick based on multi-source waste and its preparation method. Using shale as the matrix, it is compounded with fine powder from construction waste, sludge incineration ash, waste ceramic powder, and rice husk charcoal. Simultaneously, calcined kaolin, red mud, silane coupling agent, calcium stearate, sodium carboxymethyl cellulose, polyvinyl alcohol, and sodium lignosulfonate are introduced to form a composite system of "inorganic solid waste + mineral reinforcement + organic modification + low-temperature segmented sintering." The organic components play a role in plasticizing, binding, water retention, and crack reduction during the green body stage. They completely pyrolyze at high temperatures without residue and do not affect mineral phase formation. In synergy with the inorganic system, the green body achieves crack-free construction, extremely low shrinkage, and significantly improved strength.

The application discloses a sludge incineration device and method for a rotary kiln with staged air distribution and flue gas recirculation, which sends sludge and primary air into the rotary kiln from the kiln head; sends secondary air from the kiln head to the ignition section of the rotary kiln; and sends recirculated flue gas from the kiln head to the stable combustion section of the rotary kiln. The staged air distribution can form an oxygen-deficient fuel-rich zone in the initial combustion stage to inhibit the generation of NO x ; and the remaining air required for combustion is sent in the form of secondary air in the later combustion stage to make the fuel burn out; the flue gas recirculation can moderately reduce the oxygen content in the furnace and strengthen the reducing atmosphere in the combustion zone, which is beneficial to further reducing the emission of NO x in the sludge incineration process. The application uses the staged air distribution and flue gas recirculation, not only reduces the emission of NO x , but also avoids the problem that the SNCR method commonly used in the denitration of the rotary kiln incinerator needs to add ammonia water and external equipment, thereby reducing the operation cost and having good economic efficiency and application prospect.

The invention belongs to the technical field of environmental protection, and particularly relates to a multi-pollutant cooperative control method for ultralow emission of solid waste incineration flue gas. The solid waste incineration flue gas is deacidified by a semi-dry method, and then enters a biological absorption device to remove acidic pollutants such as sulfur dioxide and hydrogen chloride in the flue gas by adopting biological washing absorption, and then enters a thermophilic composite catalytic biological purification device to carry out synergistic pollution reduction on pollutants such as nitrogen oxides, heavy metals and dioxin in the flue gas; meanwhile, a wastewater treatment recycling system with a biochemical system is arranged, so that ultralow emission of flue gas is realized; the method can replace medium and low temperature SCR denitration, activated carbon jet adsorption and wet deacidification, and solves the problems that in the existing flue gas multi-pollutant synergistic pollution reduction technology, the low temperature SCR denitration is unstable, the operation cost is high, the adsorption method is easy to saturate, the adsorption and purification efficiency is low, secondary pollution is easy to generate and the like; the device is suitable for deep purification treatment of flue gas pollutants in waste incineration, sludge incineration, hazardous waste incineration and other solid waste incineration.

The utility model belongs to the technical field of flue gas treatment, and particularly discloses a municipal sludge incineration flue gas system for increasing the flue gas temperature of a bag-type dust collector, which comprises an incineration kiln and a secondary combustion chamber connected with the incineration kiln, and the secondary combustion chamber is sequentially connected with a spray drying tower, a cyclone dust collector and the bag-type dust collector through a main pipe. A branch pipe is connected to the main pipe between the secondary combustion chamber and the spray drying tower, the other end of the branch pipe is connected to the main pipe between the cyclone dust collector and the bag-type dust collector, a heat exchanger is arranged on the branch pipe and used for reducing the flue gas temperature, and a first valve is arranged on the branch pipe between the heat exchanger and the secondary combustion chamber; compared with an incineration flue gas system in the prior art, the sludge incineration flue gas system has the advantages that the inlet temperature of the bag-type dust collector can be increased, the moisture content of flue gas can be reduced, the bag pasting phenomenon of the bag-type dust collector is avoided, and the stable pressure difference between the inlet and the outlet of a bag is ensured, so that the incineration efficiency of an incineration kiln is improved, and the energy consumption of a fan is reduced.

The invention discloses a biomass fuel combustion-supporting method for a sludge incineration circulating fluidized bed boiler, and solves the problems of large fluctuation of a sludge combustion heat value and how to scientifically and reasonably carry out blending combustion on sludge fuel and biomass fuel in a hearth so as to realize safe and stable combustion of the boiler. The sludge fuel and the biomass fuel are designed to be respectively fed into a furnace; a bottom material is laid on an air distribution plate, biomass particle fuel entering a furnace is ignited through oil ignition, and when the temperature of a hearth is increased to 850 DEG C or above, sludge fuel is fed, so that the blanking point of the sludge fuel entering the hearth is arranged above the blanking point of material returning of a cyclone separator; a blanking point of biomass particle fuel entering a hearth is arranged above a blanking point of sludge fuel entering the hearth, and a single-row secondary air inlet is arranged above the blanking point of the biomass particle fuel entering the hearth, so that after the sludge fuel begins to be fed, a combustion structural form that combustion sludge rises and then is mixed with the biomass fuel entering the hearth for combustion is constructed.

The present application relates to a kind of sludge incineration fly ash phosphorus resource preparation multifunctional water-soluble fertilizer method, multifunctional water-soluble fertilizer;With biological sludge incineration fly ash as core raw material, by weak acid directional solvus-potassium sulfate synergistic cooperation-alkaline complex liquid selective chelation heavy three-stage type core process, realize the efficient solvus of phosphorus, heavy metal and arsenic are removed in depth and multifunctional nutrient in situ coupling.The process of the present application is normal temperature and pressure, mild and efficient, fly ash and alkaline complex liquid are zero-cost raw materials, only a small amount of sulfuric acid, potassium sulfate adjuvant, with high phosphorus solvus rate (≥80%), heavy metal and arsenic removal rate (≥99%) and low production cost, solve the biological sludge incineration fly ash phosphorus-heavy metal-arsenic associated separation difficult, agricultural and building material path double limited industry pain points, realize solid waste resource, phosphorus resource high value and the coordinated development of green agriculture, overall technology reaches international leading level, some core innovation is unique in the world.

The invention discloses a sludge drying incineration control system and method utilizing coupled pyrolysis gas, and belongs to the technical field of sludge incineration treatment.The sludge drying incineration control system comprises a treatment system and a monitoring control system.The treatment system sequentially comprises a pretreatment device, a drying device, an incinerator, a waste heat utilization device and a flue gas purification device; a shunting regulation and control device is further arranged between the drying device and the incinerator, the shunting regulation and control device comprises a shunting three-way valve, a direct combustion branch pipeline and a pyrolysis branch pipeline, and the outlet end of the pyrolysis branch pipeline is further provided with a pyrolysis device, a pyrolysis gas purification device and a coupling supply device. On the basis of split-flow treatment of sludge from the same source, the pyrolysis unit serves as an internal energy supply unit of the incineration unit, and combustible gas generated by pyrolysis is used for preferentially replacing auxiliary natural gas needed by incineration and carrying out bottom-covering regulation and control, so that an energy self-coupling closed loop in the sludge treatment system is constructed.

The invention relates to a heavy metal removal system for sludge incineration boiler flue gas, which comprises a fan, a first flue, a first desulfurization tower, a second flue, a second desulfurization tower, a third flue and a chimney which are sequentially arranged outside an incinerator flue gas outlet in a communicating manner, the economizer is arranged on the first flue, and the tubular heat exchanger is arranged on the third flue. The device has the beneficial effects that the tubular heat exchanger is arranged on the third flue, water vapor is condensed and liquefied through heat exchange, heavy metal is attached to liquefied water and is discharged from the liquefied water outlet of the tubular heat exchanger, and heavy metal aerosol is prevented from being formed; the water vapor is condensed and liquefied, the humidity of the flue gas is reduced, acid gas in the flue gas can be prevented from being combined with the water vapor to generate strong acid, and corrosion to equipment in the system is reduced.

The H-shaped dry and wet sludge mixed incinerator can directly receive wet sludge as a material, and compared with the prior art, dewatering or drying equipment does not need to be independently arranged for the wet sludge, so that the system complexity is reduced, and the system operation cost is also reduced; meanwhile, sludge incineration and flue gas incineration are respectively arranged in the incineration chamber and the secondary combustion chamber based on an H-shaped structure, the solid incineration chamber and the flue gas incineration chamber are separately arranged, high-temperature flue gas generated after dry and wet sludge on the bubbling fluidized bed is combusted is directly subjected to secondary combustion in the secondary combustion chamber from the flue gas guide channel, and the combustion efficiency is high; compared with an existing integrated furnace body, combustion-supporting heat does not need to be additionally increased, and the overall operation cost of the system is further reduced.

The invention discloses a method for extracting phosphorus from sludge incineration ash and recycling residues, and belongs to the field of sludge recycling. The method comprises the following steps: firstly, conditioning municipal sludge to dehydrate by adopting calcium salt, reducing the water content of the sludge and fixing phosphorus in a liquid phase; then, the obtained calcium-containing sludge and an alkali metal reagent are mixed and incinerated, and insoluble metal phosphate in the sludge is promoted to be converted into water-soluble phosphate; the incineration ash is subjected to water leaching treatment, and a phosphorus-rich solution can be obtained through separation (the phosphorus recovery rate is gt; 90%) and leaching residues; finally, the leaching residues are directly mixed with cement, sand and water in proportion, and the strength of the prepared mortar test block meets the GB 175-2007 standard requirement. In the sludge treatment process, efficient recycling of phosphorus resources in the sludge and complete recycling of incineration ash leaching residues are synchronously achieved, the method has the advantages of being simple in process and controllable in cost, the mature incineration process is coupled, and industrial application is easy to achieve.

This invention discloses a system and method for direct incineration of high-moisture-content sludge, including a high-moisture-content sludge direct incineration device, a flue gas heat exchanger, a blower, flue gas treatment equipment, an induced draft fan, and a chimney. The high-moisture-content sludge direct incineration device includes a multi-pass rotating device and a settling chamber. In this system, the sludge is dried in the first pass, pyrolyzed in the second pass, and burned in the third pass. High-temperature air serves as the heat source for sludge drying and also as the combustion air during sludge incineration. This device is the core of the system, integrating multiple sludge disposal processes into one, resulting in a relatively simple and easy-to-control system. The high-moisture-content sludge direct incineration device in this system can effectively dry, pyrolyze, and incinerate sludge. The exhaust gas generated during drying is also treated during incineration, eliminating the need for separate treatment lines.

The application discloses a method for realizing simultaneous denitrification and desulfurization by coupling sludge incineration flue gas and sludge drying condensate water, which comprises the following steps: carrying out oxidation treatment on the dust and ash removed incineration flue gas by ozone oxidation; using sludge drying condensate water anaerobic digestion effluent as the only absorption liquid to absorb the incineration flue gas, so that NO x and SO x in the flue gas are transferred to the liquid phase; the absorption liquid is introduced into a short-cut denitrification reactor, and short-cut denitrification anaerobic ammonia oxidation and sulfate reduction anaerobic ammonia oxidation are utilized to realize simultaneous denitrification and desulfurization. The application realizes flue gas desulfurization and denitrification and sludge drying condensate water denitrification by coupling the incineration flue gas and the sludge drying condensate water and utilizing anaerobic ammonia oxidation and sulfate reduction anaerobic ammonia oxidation, and the reagent adding and operation cost are greatly saved.

The invention discloses a controllable low-strength material based on sludge incineration fly ash of a sewage treatment plant and a construction waste regenerated mixture and a preparation method of the controllable low-strength material. The controllable low-strength material is prepared from the following raw materials in parts by mass: 10-15 parts of cement, 0-8 parts of blast furnace slag powder, 2-15 parts of sludge incineration fly ash of a sewage treatment plant, 100-130 parts of a construction waste regenerated mixture and 30-70 parts of water. The solid waste generated in the urban operation and maintenance process can be treated in a harmless and low-cost mode, and the production cost of the controllable low-strength material is greatly reduced.

The invention relates to the technical field of energy utilization and energy conservation and emission reduction, and discloses a sludge incineration tail gas treatment system based on an energy storage heat exchanger. The system comprises a tail gas purification module, a carbon capture and solidification module, a circulating power generation module, an air dehumidification heat pump module and a cascade energy storage module. The tail gas purification module is used for sequentially carrying out particulate matter filtration, desulfurization, electrostatic dust collection and denitration treatment on tail gas discharged by the incinerator; the carbon capture and solidification module is used for collecting CO2 in the tail gas through a temperature swing adsorption and low-temperature cooling technology; the circulating power generation module is used for converting low-grade waste heat in the tail gas into electric energy through an organic Rankine cycle technology; the air dehumidification heat pump module is used for dehumidifying and preheating air entering the incinerator; the stepped energy storage module is used for conducting graded recovery and management on waste heat of different temperature zones in tail gas in the purification process. According to the system, various pollutants in the tail gas are efficiently removed, and waste heat of different temperature grades is recycled and utilized in a graded mode.

The utility model relates to the technical field of sludge incinerators, and discloses a circulating fluidized bed incinerator for incinerating sludge, which comprises an incinerator main body, an igniter is mounted on the front side of the incinerator main body, a pretreatment assembly is arranged on the rear side of the incinerator main body, and the pretreatment assembly comprises a treatment box arranged on the rear side of the incinerator main body. And an extrusion cylinder is fixed to the top face of the treatment box in a penetrating mode, a pressing plate is slidably arranged in the extrusion cylinder, the bottom face of the extrusion cylinder abuts against a separation base, and a filtering plate is fixed to the top face of the separation base. According to the sludge incineration device, sewage is firstly extruded and removed, the water content of residual sludge is greatly reduced, the incineration process can be more efficient, dry sludge is easier to burn and high in heat value, and extra energy consumption is reduced; high-temperature flue gas generated in the incineration process can be effectively utilized to evaporate moisture, the moisture is prevented from taking away a large amount of heat in the incineration process, and the overall sludge combustion efficiency is improved.

According to the sludge pretreatment system and the sludge incineration system, the sludge from the sludge bin is conveyed into the vacuum belt dehydrator through the first conveying device to be filtered and adsorbed, and the vacuum belt dehydrator separates moisture in the sludge and then conveys the sludge to the stock bin. Due to the fact that the heating jacket is arranged on the outer side of the stock bin, high-temperature flue gas from the boiler flue gas pipeline enters the heating jacket and preheats and dries the sludge in the stock bin, moisture in the sludge is reduced, the moisture content of the sludge entering the heating and drying device is lower, and steam generated by drying the sludge is less. And the sludge in the stock bin is conveyed into the heating and drying device through the second conveying device, and high-temperature flue gas of the boiler flue gas pipeline enters the heating and drying device to be subjected to rotary drying treatment with the sludge. And the dried sludge is finally fed into a boiler of the sludge incineration system to be incinerated. Through the arrangement, the sludge moisture entering the boiler can be effectively reduced, so that the burning coal quantity of the boiler is reduced.

The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a sludge incineration slag resource utilization method. The method comprises the following steps: mixing the sludge incineration slag, water and acid for acid leaching to obtain an acid leaching solution; the pH value of the acid leaching liquid is adjusted to be 3-5 with alkali, first alkali treatment is conducted, and first alkali treatment residues are obtained; adjusting the pH value of the first alkali treatment slag to 11.5-13.5 by using alkali, and carrying out second alkali treatment to obtain a second alkali treatment solution; and preparing an iron phosphate product and / or a calcium superphosphate product by taking the second alkali treatment solution as a raw material. According to the method, the high dissolution rate of phosphorus in the sludge incineration slag is achieved, so that resource recycling of phosphorus in incineration slag waste is effectively achieved, meanwhile, a ferric hydroxide precipitation product and an aluminum hydroxide precipitation product are obtained, the recycling cost is low, consumption of raw materials such as phosphate ore is reduced, and resource utilization of the sludge incineration slag is achieved.

The invention relates to the technical field of tail gas purification, and provides a sludge incineration tail gas purification system which comprises a plurality of dust removal towers, and the dust removal towers are used for preliminarily removing dust particles from tail gas generated by sludge incineration through dust removal bags in the dust removal towers; the dust removal bag is in a curled state under the action of the multiple folded offset blocks, the multiple offset blocks are unfolded through a traction assembly to synchronously pull the dust removal bag to be unfolded so as to shake off dust particles on the surface of the dust removal bag, and the dust particles are rapidly discharged through an ash discharging channel installed at the bottom end of the dust removal tower. Heat of tail gas in the gas inlet pipe can be recycled for heating reaction liquid, the reaction capacity of the reaction liquid and substances in the tail gas is improved, the efficiency of removing acid and alkaline gas through catalytic reaction is enhanced, and efficient utilization of energy is achieved; the problems that in an existing sludge incineration tail gas purification technology, the acid gas removal efficiency is low, the dust removal effect is poor, and the heat recycling rate is low are effectively solved.