61results about How to "Reduce the amount of fly ash" patented technology

The invention discloses a waste burning smoke purification process. The process comprises a denitration step and an acid removal step. The denitration step comprises a combination step of a smoke recycling process and a selective non-catalytic reduction (SNCR) denitration process; the acid removal step comprises a primary acid removal step and a secondary acid removal step; and a spray drying method is used for removing acid in the primary acid removal step, and a suspension boiling method is used for removing acid in the secondary acid removal step. The generation of NOx is inhibited by the smoke recycling process, acidic gases in the smoke are removed by the secondary acid removal process, and the burned smoke is efficiently purified with relatively low operating cost. The deep purification effect of the smoke is achieved by organically combining several processes.

The invention relates to a coal pyrolysis and gasification coproduction method. The method comprises the following steps: 1, separating coarse coal dusts and fine coal dusts from raw coal; 2, pyrolyzing the coarse coal dusts in a fluidized bed mode to obtain coal tar and semicoke; 3, gasifying the semicoke generated after pyrolysis in a fluidized bed mode to obtain a gas flow and high temperature semicoke, separating a product gas and solid particles from the gas flow, and returning at least parts of the high temperature semicoke and/or at least parts of the product gas to the above pyrolysis process in order to be used as a heat source in the pyrolysis process; and 4, carrying out coal dust gasification on the fine coal dusts separated in step 1 and the solid particles separated in step 3. The coal pyrolysis and gasification coproduction method realizes combined supply of heat, gas, oil and a chemical substance, and also realizes a high carbon conversion rate.

The invention discloses a dust collection and mercury removal integrated electric-bag composite dust collector, and relates to a dust collector. The dust collector comprises a preheater, an electric-bag composite dust collector and an active carbon adsorbent spraying device, wherein an air inlet of the preheater is connected with a smoke outlet of a boiler; the electric-bag composite dust collector consists of a pre-level electric field dust collection area and a post-level filter-bag filtering area; a smoke inlet of the pre-level electric field dust collection area is connected with a smoke outlet of the preheater; a smoke outlet of the pre-level electric field dust collection area is connected with a smoke inlet of the post-level filter-bag filtering area; the active carbon adsorbent spraying device is arranged between the pre-level electric field dust collection area and the post-level filter-bag filtering area; and the smoke flowing to the post-level filter-bag filtering area is discharged to the atmosphere through a chimney. The dust collector disclosed by the invention has higher efficiency in collecting fine dust PM2.5 than an electrostatic dust collector and bag-type dust collector, and also has a good effect in collecting tiny mercury particles. Due to the long ash removal period, the acting time of the adsorbent on mercury is prolonged, and the mercury collection efficiency is improved.

The invention relates to an ash internal cycle fluid afterburning device, based on high-temperature separation, wherein the invention uses furnace and secondary wind to realize initial high-temperature separation and sets high-temperature combined water cooling separator at the heated surface of water condense slag tube beam at the outlet of high-temperature smoke to realize ash high-temperature separation; and the separated ash is feedback to the high-temperature area to be cycle fluidized burnt, to meet the burning conditions as temperature, time, and disturbing mixing, to improve the burning rate and reduce the pollution. The invention can improve the burnt rate and the burning efficiency of coal.

The invention relates to a boiler which is used for incinerating household garbage and generating steam to be used for steam supply and electricity generation. According to the technical scheme, the waste incineration boiler with a furnace dedusting device comprises a steel frame, a boiler chamber and a fire grate, wherein the boiler chamber is composed of a hearth, a burned ash chamber and three smoke flues, and a horizontal flue and a flue with a U-shaped tail portion are arranged behind the boiler chamber. By mean of the technical scheme, the compound-type waste incineration boiler is capable of guaranteeing timely drying, full burning and burning out of the household garbage which is low in calorific value, high in moisture and high in ash specification and effectively reducing flying ash amount in smoke.

The invention discloses a J-shaped entrained-flow gasifier. The J-shaped entrained-flow gasifier is characterized in that the gasifier has a J-shaped design, a slag-drip opening is formed in the lowest point at the bent position of the J-shaped gasifier, and a slag collection chamber is formed in the lower part of the slag-drip opening; a gasifying raw material inlet is formed in the higher side of the J-shaped gasifier, and a synthesized gas outlet is formed in the lower side of the J-shaped gasifier. According to the entrained-flow gasifier, the gasifier is designed into J shape, flying gas carried in synthesized gas is collected by the wall surface of the bent position, so that the carbon conversion rate can be effectively improved, and the ash carrying capacity at the synthesized gas outlet can be reduced; and slag bonding and ash accumulation can be prevented when heat of a synthesized gas is reclaimed by a radiant syngas cooler and a convective syngas cooler. The slag-drip opening is close to the high-temperature region of the gasifier, so that the temperature of the slag-drip opening is higher, and smooth slag drip can be ensured.

The invention provides a fly ash smelting pre-treatment system which comprises a raw material storage bin, a pelleting device and a smelting furnace, wherein the rear part of the raw material storage bin is connected to the pelleting device; the rear part of the pelleting device is connected with a first hoister; the rear part of the first hoister is connected to a finished product bin; the rear part of the finished product bin is connected to a second hoister; the rear part of the second hoister is connected to the smelting furnace; the pelleting device comprises a forced feeding machine connected with the raw material storage bin; the rear part of the forced feeding machine is connected to a piece rolling main engine; the rear part of the piece rolling main engine is connected to a crushing machine; the rear part of the crushing machine is connected to a straightening granulator; the rear part of the straightening granulator is connected with a grading sieve; the grading sieve is connected with the first hoister. According to the fly ash smelting pre-treatment system provided by the invention, powdered fine fly ash are compressed to be blocky, are crushed into particles with proper size by using the crushing machine, and cannot diffuse into air during the transportation process; the particulate matters cannot drift into a tail gas treating system along with tail gas after being conveyed to the thermolysis smelting furnace; therefore, the bridging phenomenon and the phenomenon that particles are adhered to a wall are avoided.

The invention discloses a filter bag dust collector, and belongs to the technical field of dust removal. In view of the problem of uneven distribution of smoke on the surface of a filter bag in an existing filter bag dust collector, the filter bag dust collector comprises a case and a filter plate, the filter plate is provided with the filter bag, the filter plate is installed above the inside ofthe case, two vertical flow passage partition plates are disposed under the filter plate, and the two flow passage partition plates divide the case into a smoke flow passage and two dust removal chambers. The collector increases the smoke flow distance and the residence time through the two flow passage partition plates, adds an airflow uniforming device, makes the smoke flow over to uniformly cover the entire dust removal chambers, and has the advantages of improving the surface area utilization rate of the filter bag, improving the dust removal efficiency and reducing filter bag wear probability.

The invention provides a household waste sorting and drying system. The waste heating value can be increased, the moisture content of household waste is decreased, most of recycled items such as metaland plastic can be effectively recycled, the waste resource degree is high, and the waste is changed into fuel with the high heating value. A waste front sorting system comprises a raw waste grab bucket crane, a bag break crusher, a first front sorting conveyor, a second front sorting conveyor, a third front sorting conveyor, a fourth front sorting conveyor, a fifth front sorting conveyor, a sixth front sorting conveyor, a seventh front sorting conveyor, a first magnetic separator, a front sorting drum screen, a first bounce screen, a second bounce screen, a first photometric sorter, a secondphotometric sorter, a third photometric sorter, a fourth photometric sorter, other plastic belt bins, an HDPE plastic belt bin, an LDPE plastic belt bin and a front sorting packing machine; a waste drying system comprises a drying bin grab bucket crane, a drying bin, a first drying conveyor and a drying front temporary-storing bin; and a waste rear sorting system comprises a first rear sorting conveyor, a second rear sorting conveyor, a third rear sorting conveyor, a fourth rear sorting conveyor, a fifth rear sorting conveyor, a sixth rear sorting conveyor, a seventh rear sorting conveyor, aneighth rear sorting conveyor, a first belt bin, a second belt bin, a rear sorting drum screen, a flip-flow screen, a glass sorter, a disc homogenizer, a second magnetic separator, a winnowing machine, an eddy current sorter, a rear sorting packing machine and an outer transportation conveyor.

The invention discloses a rural household waste incineration method and device, and belongs to the technical field of waste disposal. The problems of rural household waste disposal at present are solved. The method comprises the steps that a circulating fluidized bed incinerator is used for incinerating dried waste with the moisture content being 15% or below, and water vapor released by waste drying is drawn to be injected into a hearth for cooling in the incineration process. The device comprises the circulating fluidized bed incinerator. A vapor inject-in port is formed in the side wall ofthe hearth of the circulating fluidized bed incinerator. A tubular heat exchanger, a vapor heater, a secondary air preheater and a primary air preheater are sequentially arranged in a tail flue of thecirculating fluidized bed incinerator. A vapor outlet of the vapor heater is connected with a vapor inlet of a rotary kiln roller dryer. The roller wall of the rotary kiln roller dryer is of a hollowrow tube structure. An inlet and an outlet of the tubular heat exchanger communicate with the two ends of the roller wall correspondingly. The rural household waste incineration method and device areused for waste disposal.

The invention relates to a U-shaped coal gasification reaction device and a process for coal gasification by using the device, and aims to solve the problems of large flying ash generation amount, high flying ash carbon content, low carbon conversion rate and low energy utilization rate of an existing entrained flow gasifier. The U-shaped coal gasification reaction device consists of a gasifier body, a horizontal flue and a waste pan, wherein the gasifier consists of a gasifier nozzle, a gasifier hearth, a water cooling wall pipe and a slag basin; the waste pan is divided into a radiation heat exchange chamber and a convection heat exchange chamber through a middle furnace wall; the gasifier body, the horizontal flue and a second gasification chamber form a U-shaped coal gasification reaction region. The U-shaped coal gasification reaction device is used for coal gasification.

The invention relates to a smoke recycling rubbish incineration boiler. The smoke recycling rubbish incineration boiler comprises a boiler steel frame and a furnace arranged on the boiler steel frame. A grate mounting frame is arranged under the furnace, and a reciprocating machinery grate is arranged on the grate mounting frame. The rear part, of a smoke outlet, on the top of the furnace is provided with a first shaft flue, a second shaft flue, a third shaft flue, a horizontal flue, a first vertical rear flue and a second vertical rear flue which are connected in order. A smoke outlet A formed in the upper portion of the second vertical rear flue is connected with the smoke recycling nozzles arranged on the back wall and the front wall of a furnace exit through a smoke recycling system. A precipitator is arranged between the exit of the first vertical rear flue and the entrance of the second vertical rear flue. The smoke recycling rubbish incineration boiler has the advantages that the drying sludge can be burned at the time of rubbish incineration disposal, the heat loss due to exhaust gas of the boiler is decreased by more than 15%, the heat efficiency is increased by more than 2.2%, the dust capacity of the smoke in the exit of the boiler is decreased by more than 90%, the continuous running time is long, and effects of high efficiency, energy conservation and emission reduction can be achieved.

The invention discloses a quantitative compressing device for fly ash solidification, and belongs to the technical field of waste incineration. The quantitative compressing device comprises a scale hopper, a compressing box, a power mechanism and a supporting mechanism. The scale hopper is mounted on a feed inlet of the compressing box. The compressing box is mounted on the supporting mechanism. Opening and closing of the compressing box and dynamic extending and contracting movement of the supporting mechanism are powered by the power mechanism. A bottom panel of the compressing box is oblique in the initial state. One end of the compressing box is a material compressing end, the other end of the compressing box is a motion end of a compressing rod of the power mechanism, and the initial height of the motion end is greater than that of the material compressing end. The scale hopper is arranged on the compressing box, the material extrusion quantity each time of the compressing box and the size of the compressing box are controlled, the problem that solidification blocks in the fly ash solidification process are different in size is solved, and the quantitative compressing device for fly ash solidification has the advantages that materials are input quantitatively, and solidification blocks equal in density are output.

The invention relates to a device for producing a crude gas containing CO or H2 by gasification of an ash-containing fuel with oxygen-containing gas at temperatures above the fusion temperature of the ash in a gasification reactor and with a connected gas cooling chamber and a tapered connecting channel running from one chamber to the other. The aim of the invention is avoiding known problems and reducing the amount of fly ash and the amount of ungasified fuel, wherein a weak eddy is achieved in the inlet to the subsequent apparatuses in order to avoid deposits there with a very compact device, wherein the risk of solidification of the slag in the outlet is also avoided. The aim is achieved, wherein in the tapered connection channel (5) eddy reducing or eliminating wall surfaces (6) running over only a part of the cross-section of the connection channel are provided.

The invention discloses a leather tanning chromium-containing waste treatment method, which aims to solve the problems that hazardous wastes including chromium leather shavings and chromium mud can be generated during leather tanning, a small amount of trivalent chromium is converted into hexavalent chromium due to direct incineration of the chromium leather shavings, the toxicity of waste residues after combustion is increased, the treatment difficulty is increased, the nitrogen content of the chromium leather shavings is high, the nitric oxide content in combustion smoke is high, and the smoke treatment cost is high. The chromium leather shavings and chromium mud are treated through the four working stages of pretreatment, roasting, post-treatment and smoke treatment, the problem existing in landfill after direct incineration or direct landfill of the chromium leather shavings is solved, and recycling of waste resources is achieved,. The leather tanning chromium-containing waste treatment method has good environmental benefits and economic benefits.

A method for lowering the quantity and toxicity of the flying ash of a household garbage incineration plant is characterized by including the steps of firstly, mixing cream-colored mud and existing flying ash of the household garbage incineration plant according to a certain proportion, smashing to reach a certain particle size, mixing with fine grinding media according a certain proportion, and performing fine grinding with a stirring ball mill; secondly, pressing the finely-ground flying ash and cream-colored mud into cylindrical samples under certain pressure; thirdly, during household garbage incineration, putting the samples into an incineration hearth at a certain speed, and fully utilizing the waste heat generated by the incineration to perform fast mullite reaction so as to allow generated substances containing mullite to settle to a slag system, to lower the flying ash quantity during the incineration to 40% of the original quantity, and to reduce heavy metal contents in the flying ash. The method has the advantages that the temperature of a household garbage incineration furnace is fully utilized, the method is simple in process, low in cost and free of pollution, subsequent flying ash processing cost and difficulty are lowered, and good economic and social benefits are achieved.

The invention discloses a double-circuit gasification and combustion system based on a circulating fluidized bed and a method and application thereof. The double-circuit gasification and combustion system comprises a gasifier, a primary separator, a heat exchanger, a secondary separator, a boiler and an ash bin, wherein the inlet of the primary separator communicates with the outlet of the gasifier; the gas outlet of the primary separator communicates with the heat medium inlet of the heat exchanger; the heat medium outlet of the heat exchanger communicates with the inlet of the secondary separator; gas subjected to primary separation is subjected to heat exchange for cooling in the heat exchanger; the gas outlet of the secondary separator communicates with the boiler; the solid outlet of the primary separator communicates with the inlet of a first material return valve; one side outlet of the first material return valve communicates with a first material return opening of the gasifier, and the other side outlet of the first material return valve communicates with the ash bin; the solid outlet of the secondary separator communicates with the inlet of a second material return valve; and one side outlet of the second material return valve communicates with a second material return opening of the gasifier, and the other side outlet of the second material return valve communicates with the ash bin.

The invention relates to the technical field of the lime kiln and discloses an air supply system for the lime kiln. The air supply system comprises an exhaust fan, an air supply pipeline and an air collection tank, the exhaust fan is fixedly connected with the air supply pipeline, the air collection tank is ring-shaped, the air collection tank and the air supply pipeline are fixedly connected, three air supply branch pipes are formed in the ring-shaped inner wall of the air collection tank, the included angles among the three air supply branch pipes are 120 degrees, and an air cap is arrangedon the intersection part of the other ends of the three air supply branch pipes. The air cap is in a tower-shaped structure, the diameters of the multiple layers of the tower-shaped structure are thesame, a plurality of air supply holes are evenly distributed at each periphery of each layer of the air cap, and a plurality of air outlets are evenly distributed at the periphery of each layer of theair cap. The air cap is in the tower-shaped structure, and the diameters of the ten layers of the tower-shaped structure are the same. A dust falling groove is distributed at the top part of the aircap, and a dust leading pipe is distributed at the lower part of the air cap. The air supply system overcomes the defect of uneven air supply of the lime kiln existing for a long period of time.

The invention provides a smoke recirculation device for separating primary air and secondary air. The smoke recirculation device comprises an incinerator, a smoke purification device, a primary fan and a secondary fan. The incinerator is configured to incinerate biomass to generate smoke. The smoke purification device is configured to purify the smoke, and one part of purified smoke discharged bythe smoke purification device serves as recirculation smoke. The primary fan is configured to drain air, so that the air serves as primary air of the incinerator. The secondary fan is configured to drain air and the recirculation smoke, and the air and the recirculation smoke serve as secondary air of the incinerator. According to the provided smoke recirculation device for separating the primaryair and the secondary air, the primary fan drains the air as the primary air, the secondary fan drains the air and the recirculation smoke as the secondary air, thus the flying ash quantity and the flying ash carbon content are lowered, fuel unit consumption is lowered, high-temperature corrosion is reduced, and the combustion condition is optimized.

The invention discloses a CFB (circulating fluidized bed) waste incineration boiler gas-solid separation method which is characterized by including the steps: 1 setting the fluidizing velocity of a section in a hearth to be 4-4.5 meters/second; 2 performing gas-solid separation for flue gas by a cyclone separator; 3 setting an empty flue behind the cyclone separator, and setting a 180-degree upward turn at the tail of the flue. High circulating ash concentration and efficient heat transfer in the boiler are ensured, tail fly ash quantity is decreased, fly ash particle sizes are effectively controlled within a proper range, and abrasion of a tail convection heating surface is reduced.