223 results about "Boiler slag" patented technology

The invention relates to a method for measuring microelements in high titanium blast furnace slag, which comprises the following steps: firstly, adopting an alkali fusion method to pre-process samples, and leading the samples to be totally conversed into soluble salt, and preparing into sample solution, secondly, preparing standard solution of iron, manganese, vanadium and phosphor with different concentrations, thirdly, respectively measuring the spectral line strength of calcium in the standard solution of iron, manganese, vanadium and phosphor with different concentrations, utilizing the concentration of elements to be the abscissa and the spectral line strength to be the longitudinal coordinate to draw a working curve, fourthly, measuring the intensity of the spectral lines of iron, manganese, vanadium and phosphor in sample solution under the condition which is the same to the step three, and calculating and assuring the content of the four elements in each sample solution according to the working curve. The invention has the advantages that the method is simple and fast, which has little dosage of agents and samples, and can simultaneously measure a plurality of elements. The method shortens analysis time, and lowers test cost.

A composition capable of setting to produce a building material is disclosed. The composition can include from 1% to 30% by weight of an activator, from 1% to 55% by weight of a pozzolan, such as fly ash; from 40% to 90% by weight of an aggregate; and liquid landfill leachate in a sufficient amount such that the composition sets to a building material having a compressive strength of at least 2 MPa, wherein all weight percentages are percent by weight of the total composition. The liquid landfill leachate replaces all or part of the tap water in a conventional composition for forming a building material. The liquid landfill leachate can be recovered after a liquid (typically water) percolates through a landfill and contacts at least one landfilled coal combustion product selected from fly ash, bottom ash, boiler slag, and flue gas desulfurization material. The building material can be a concrete, or a masonry unit.

The invention discloses a coal-fired power plant flue gas heat regenerative system and an energy-saving water-saving ultra-clean discharging method. The temperature of the flue gas is reduced to about 90-110 DEG.C through a low-temperature coal economizer, and the recycled flue gas heat heats primary and secondary wind entering a boiler through a steam air heaters, so that the first stage of heat regenerative cycles is achieved. The temperature of the flue gas at the outlet of a desulfurization tower is reduced to 30-40 DEG.C through a vacuum flash evaporation and solidification device and a low-temperature heat pump heat exchange device, and a part of water vapor of the flue gas is condensed and collected, so that water is saved. The low-temperature heat pump heat exchange device absorbs the latent heat released in flue gas sensible heat and condensation processes, and dry as-fired coal and air are heated, so that the second stage of heat regenerative cycles is achieved. A boiler slag discharge system recycles the waste heat of heat slag, and the as-fired coal is heated, so that the third stage of heat regenerative cycles is achieved. When the waste heat is not used up, the remained waste heat can be utilized, so that energy is saved. Low-temperature desulphurization slurry led out from the vacuum flash evaporation and solidification device is injected into the desulfurization tower, so that the desulphurization efficiency is improved, and an ultra-clean discharging objective is achieved.

The invention relates to a low-cost porous ceramic sound absorbing material and a preparation process thereof. The ceramic sound absorbing material is prepared from the following raw materials in percentage by weight: 23-28 percent of combination-process red mud, 23-28 percent of steel slags, 13-18 percent of coal gangue, 8-12 percent of carbide slag, 8-12 percent of boiler slags, 3-8 percent of quartz sand and 8-12 percent of a 10% sodium hydroxide solution. By taking the metallurgical industrial waste red mud and steel slags as main raw materials, the sound absorbing material disclosed by the invention can be used for solving the problem of noise pollution of subways, urban roads, expressways and railways.

The invention relates to a double-separation type fluidized bed slag cooler which comprises a main body (7), an air chamber (19), a slag circulating channel (22) and the like, wherein a first separation wall (3) and a second separation wall (5) are arranged in the main body (7) of the slag cooler and separate the inner space of the main body (7) of the slag cooler into 3 cooling bins (a separation bin (2), a circulating bin (4) and a water cooling bin (8)) the upper parts of which are communicated with each other; the first separation wall (3) is arranged between the separation bin (2) and the circulating bin (4); the bottom of the first separation wall (3) is provided with the slag circulating channel (22); and the slag circulating channel (22) is in a cascade plate structure. By carrying out two-stage separation on the bottom slag and arranging a slag circulating cooling loop between the separation bin (2) and the circulating bin (4), the invention reduces the air quantity for operation, enhances the adaptability to the particle size distribution of the boiler slag, increases the water cooling proportion and enhances the operation safety and reliability of the slag cooler.

The invention relates to a boiler wet slag removal system, which comprises a slag extractor and a heat exchanger. The slag extractor is located under the boiler and has a water tank for receiving boiler bottom slag. The heat exchanger includes a heat exchange surface, one side of the heat exchange surface introduces the water in the water tank as the first heat exchange medium, and the other side of the heat exchange surface is the flowing second heat exchange medium to absorb the water in the water tank energy. In one solution of the present invention, the second heat exchange medium can be air, which is provided by the blower or the primary blower of the boiler, and is sent to the air preheater for the boiler together with the cold air of the blower or the primary blower after being heated . In another solution of the present invention, the second heat exchange medium can be condensed water, which is provided by one or more low-pressure heaters of the steam turbine condensate system, and is heated and delivered to one or more low-pressure heaters . In this way, the waste heat of the slag can be recovered, which simplifies the structure of the wet slag removal system and reduces the water consumption.

The invention discloses an aerated concrete building block which is prepared from the following raw materials in parts by weight: 45 to 55 parts of fly ash, 20 to 30 parts of boiler slag, 3 to 6 parts of phosphogypsum, 17 to 19 parts of quicklime, 1 to 3 parts of cement and 0.07 to 0.085 part of aluminium powder. The preparation method of the aerated concrete building block comprises the following steps of: (1) after mixing the raw materials of the boiler slag and the phosphogypsum fully, adding water, grinding, preparing mixed slurry, adding the water into the fly ash, preparing fly ash slurry, mixing the mixed slurry, the fly ash slurry, the quicklime, the cement and the aluminium powder fully and evenly and preparing a mixed material; (2) pouring the mixed material obtained in the step (1), molding and cutting into a building block blank after precuring at the temperature of 30 to 35 DEG C for 1.5 to 2.5 hours; and (3) steaming and curing the building block blank to obtain the aerated concrete building block.

The invention discloses an energy-saving and environment-friendly boiler with a preheating function. The energy-saving and environment-friendly boiler comprises a shell, a grate, a boiler slag collection trough, a circulating pump and a fan. A vertical material uniformization plate is arranged on the upper surface of the grate. A material passing opening penetrating the two sides is formed in the material uniformization plate. A heat absorption pipe is arranged in the boiler slag collection trough and is located at the bottom of the boiler slag collection trough, and the outer end of the heat absorption pipe communicates with a heat exchanger. Multiple heat conduction columns are horizontally inserted into a water jacket. The other end of a smoke discharging pipe communicates with a waste heat collection box. A heat exchange coiled pipe is mounted in the waste heat collection box. The bottom of the waste heat collection box communicates with a purification box. According to the energy-saving and environment-friendly boiler, the arranged material uniformization plate moves to uniformly pave dye, the combustion area of fuel is large, and contact of the fuel and air is sufficient; and heat in smoke is absorbed by the heat exchange coiled pipe and used for preheating inner heating water, the water temperature increase speed is increased, and the heating efficiency of hot water in the boiler is guaranteed.

The invention belongs to the technical field of biomass power generation, and particularly relates to a new biomass gas and coal dust mixed combustion process. The process adopts a biomass gasification system, a high-temperature dust removal system, a coal dust boiler and an auxiliary system thereof; and the biomass is gasified in a gasification furnace, the generated biomass gasification gas enters the high-temperature dust removal system, solid granules are removed, and then the high-temperature biomass gas is sprayed into the coal dust boiler and is combusted in the coal dust boiler. The process realizes efficient and reasonable utilization of fuels with low heat value, can avoid the problems of boiler slag formation and monitoring and the like produced in a direct mixed combustion process of the biomass, effectively reduce the discharge of pollutants such as NOX and the like and improve the combustion efficiency, and meanwhile can prevent the coal dust components from being affected, ensure later effective utilization and fulfill dual purposes of energy conservation and environmental protection.

The invention relates to a preparation method of an insulating baking-free brick. The preparation method comprises the following steps: (1) premixing: adding water into raw materials including gangue, steel slag, gasification slag and boiler slag according to a certain mass ratio and stirring until the materials are uniformly mixed; (2) aging; (3) moulding; (4) press-fitting; (5) steam curing; and premixing and adding CaO and Na2SO4 as excitant, and adding a binder into a heat-insulation layer. By the preparation method, strength of the insulating brick is greatly enhanced; and gangue and steel slag, etc. are changed from waste into valuable things so as to save resources and protect the environment. The preparation method of the invention is simple and feasible, and is easy to realize. Strength of the brick prepared by the method is 3 times higher than strength of a common brick. The brick of the invention has huge market potential and wide prospect.

The invention discloses a novel haydite concrete light-weight building block walling material and a preparation method thereof. The walling material is prepared from a cementing material, haydite, boiler slag, water and silica sand powder. The preparation method comprises the following steps: drying building sand of which the content of silicon dioxide is greater than 90%, or crushed quartzite, and grinding to obtain silica sand powder of which the specific area is 400-500m<2>/kg; weighing 0.11-0.43 part of silica sand powder, 1 part of cementing material, 1-2.6 parts of tailings, 1.3-3.4 parts of haydite, 1.5-3.5 parts of boiler slag, 0.30-0.50 part of water and 0.0021-0.0050 part of foaming agent; adding the silica sand powder, cementing material, tailings, haydite, boiler slag and water into a forced mixer, evenly mixing, quickly adding the foaming agent, and mixing for 30 seconds; and evenly filling the mixture in a die, carrying out extrusion forming, carrying out natural curing or atmospheric steam curing, and curing at 175-190 DEG C under high pressure for 2-6 hours, thereby obtaining the walling material.

The invention relates to a method for reducing contamination of high-sodium coal. The method comprises the following steps: breaking the high-sodium coal and an ash fusion point regulating agent and screening, then mixing the high-sodium coal with the ash fusion point regulating agent so that the ash composition of the mixture meets certain conditions, then putting the mixture into a boiler for burning, and controlling the temperature and excess air coefficient of the burning boiler; and starting a boiler slag removing system for removing slag. The method has the advantages that the high-sodium coal is combined with the ash fusion point regulating agent in different ratios, so that the composition ratio of each ash of a mixed ash sample is changed, the ratio of contents of various elements is regulated, especially the ratio of silicon and aluminum elements is improved, an ash fusion point of the mixed ash sample rises, the sodium element migrates into sodium silicate and sodium silicoaluminate and is discharged outside along with coal residues, and thus the problems of contamination, scorification and corrosion of the high-sodium coal during burning in the boiler are solved; and meanwhile, the technology is simple, the operation is safe, and the investment is low.

The invention discloses a boiler slagging condition monitoring method based on the outlet temperature of a combustion chamber. The monitoring method includes the steps of 1, detecting the outlet temperature of the combustion chamber; 2, calculating the temperature change before and after soot blowing and the temperature rising rate after soot blowing of an outlet of the combustion chamber according to detection in the step 1; and 3, judging that combusted coal tends to form slag when the temperature change is greater than 50 DEG C and the temperature rising rate is greater than 5 DEG/h, and judging that the combusted coal is not suitable for long-term combustion and adjusting the coal type when the temperature change is greater than 80 DEG C and the temperature rising rate is greater than 10 DEG/h. The invention further provides a boiler slagging condition controlling method based on the outlet temperature of the combustion chamber. According to the monitoring method and the controlling method, scientific use of a soot blower can be effectively guided, the outlet temperature of the combustion chamber can be continuously recorded, the temperature change before and after soot blowing and the temperature rising rate after soot blowing of the combustion chamber can be calculated, the use time of the soot blower can be further obtained, and the cleanliness degree of a water-cooled wall and the slagging characteristics of the coal type can be reflected.

The invention discloses a control system and a control method for a material bed of a circulating fluidized bed boiler, and belongs to the technical field of boiler and automatic control. The control system comprises a hearth pressure gauge, an air compartment pressure gauge, a material bed thermometer, a slag cooler slagging thermometer, a slag cooler water outlet thermometer, a slag cooler water inlet thermometer, a slag cooler drive motor, and a PLC control system. The hearth pressure gauge and the air compartment pressure gauge are connected to a material bed differential pressure transmitter, which transmits electrical signals to the PLC control system; the slag cooler slagging thermometer, the slag cooler water outlet thermometer and the slag cooler water inlet thermometer send electrical signals to the PLC control system; and the PLC control system sends electrical signals to a slag conveying device and the slag cooler drive motor. The invention is safe, reliable and convenient for operation, and can improve utilization efficiency of boiler slag waste heat and production efficiency, and realize automatic control of slagging and real-time monitor for boiler material bed, so as to reduce production cost and labor intensity of operator, and facilitate control of the slag cooler to recover waste heat from high temperature slag.

The invention provides a water-cooling dry-type slag discharge device of a pulverized coal boiler. The water-cooling dry-type slag discharge device comprises a drum slag cooler and a slag conveyor, a slag crushing device is arranged between a boiler slag well and the drum slag cooler, an outlet of the slag crushing device is communicated with a feed port of the drum slag cooler, a discharge port of the drum slag cooler is communicated with the slag conveyor, the slag crushing device is a high-temperature double-roll slag crusher which comprises two rotary rolls driven to rotate oppositely by a transmission mechanism a plurality of slag crushing teeth are distributed on the surface of each rotary roll along the axial direction of the rotary roll, the rotary rolls are arranged in a water jacket case, and auxiliary slag crushing teeth corresponding to the slag crushing teeth on the surfaces of the rotary rolls are distributed on the inner wall face of the water jacket case. A cooling chamber for supplying cooling water is formed in each of the rotary rolls and the water jacket case to cool parts in contact with slag blocks. The water-cooling dry-type slag discharge device of the pulverized coal boiler can crush coal slag to the required size and store the crushed slag as well as achieve heat recycling.

The invention relates to a method for relieving boiler slagging by using fly ash circulation, aiming at solving the problem of the traditional large power station boiler slagging, i.e. a certain amount of fly ash and coal dust being mixed and then sent to a hearth so as to achieve the purpose of relieving the boiler slagging. Researches find that the fly ash contains higher contents of SiO2 and Al2O3, and the fly ash and the coal dust are mixed in certain proportions to relieve the boiler slagging. Whether the method can be used or not is determined according to a value of the silica-alumina ratio of SiO2 to Al2O3 in the fly ash and the ash fusion softening temperature ST of the fly ash. In order to guarantee that the fly ash does not have a strong impact on fire-catching timeliness of the coal dust in the hearth and to relieve the slagging process at the same time, the amount of the mixed fly ash is determined according to the value of SiO2 to Al2O3 in the fly ash. The method can relieve the boiler slagging, and is economical and simple and convenient to operate.

A method for measuring the potassium content of the alkali-containing slag with a gas-slag balancing technique belongs to a technique field of a physical and chemical experiment. The method is used for settling the problem that the complexity and difficulty of the potassium capability high-temperature experiment is increased because of the specificity of K2O in the slag. The technical scheme is composed of the procedures of preparing slag specimen, setting the arranging position of slag specimen and potassium carbonate agent in the corundum tube of the high temperature furnace, balanced reacting, measuring the content of potassium and the like. The invention adopts the gas-slag balancing technique. A platinum crucible is used as a gas-slag reaction vessel. A corundum crucible is used as a generation container of the potassium steam. The mixed gas of CO-CO2-Ar is used for control a certain partial pressure of oxygen in the system. The potassium carbonate decomposes to control the partial pressure of potassium in the system. The potassium capability of furnace slag CaO-SiO2-Al2O3-ZnO-TiO2 under different conditions is measured in MoSi2 high-temperature resistor furnace. The invention has the advantages of easy method, good repeatability, accurate measurement to the potassium content of alkali-containing furnace slag, and accurate data provided to the content of base metal in the furnace.

The invention relates to an automatic carbon residue recovery method for coal gasification slag treatment, which belongs to the technical field of coal gasification slag treatment and is characterized in that mixed slag is filled in a storage hopper, the top of the storage hopper is provided with a spraying device, the mixed slag is adjusted by adding water and stands in the storage hopper for 1-2 hours, and slag and carbon residue are separated from the mixed slag by schizolysis and then sieved; the sieve pore diameters of the front section and the rear section of a sievemesh are different, the slag is sieved out from the front section of the sievemesh, the carbon residue with a grain diameter between 10 mm and 15 mm is sieved out from the rear section of the sievemesh, and original carbon residue contained in the sieved carbon residue and mixed slag enters a second-stage carbon residue storage hopper from the tail part of a revolving screen. The invention utilizes the schizolysis to split the slag by adopting a principle that the stability of two substances with different structures are different because of the difference of the structures, thereby enabling the slag with complex grain diameters to become two materials which are easy to sieve so as to be recycled, such as fine slag with a small grain diameter and carbon residue coalballs which can not be split by the schizolysis but can be recycled, and realizing the automatic recycling of gasification slag carbon residue and the close type treatment.

The invention discloses a device and a method for recovering bottom slag heat of a circulating fluidized bed boiler and relates to a circulating fluidized bed boiler technology. A bottom slag heat recovering chamber is formed below the hearth of the circulating fluidized bed boiler and is directly communicated with the hearth through gaps among air distribution pipes of the hearth; and the bottom slag falls into the bottom slag heat recovering chamber from the gaps among the air distribution pipes and exchange heat with a cold slag heat exchange surface formed in the bottom slag heat recovering chamber; and after being cooled, the bottom slag is discharged out of the boiler from the bottom of the bottom slag heat recovering chamber, and a cooling medium in the cold slag heat exchange surface is heated. The working medium of the circulating fluidized bed boiler is used as the bottom slag cooling medium, the heat brought out of the hearth by the bottom slag is recovered, and the physical heat loss of the boiler slag is reduced, so that the heat efficiency of the boiler is improved.

The invention discloses a lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent. The water reducing agent is prepared by, by weight, 240-250 parts of TPEG, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persulfate, 0.53-0.55 part of thioglycolic acid, 13-14 parts of lignin, an appropriate amount of sodium hydroxide solution with the concentration being 10wt%, an appropriate amount of deionized water, 26-28 parts of graphene oxide, 20-23 parts of boiler slag, 5-7 parts of sorbitol, 2-3 parts of sodium nitrite, 2-3 parts of dodecyl dimethyl benzyl ammonium chloride, 4-5 parts of carbon black and 3-4 parts of microcrystalline wax. The lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent has the advantages that components such as the carbon black and the dodecyl dimethyl benzyl ammonium chloride are added into the preparation of the water reducing agent, so that the dispersity of the water reducing agent in concrete can be increased; the industrial waste boiler slag is added into the water reducing agent, so that production cost is lowered; the sodium nitrite is added into the water reducing agent, and accordingly the early strength and later strength of the concrete are further increased.

The invention discloses an autoclaved fly ash brick for construction, which is prepared from the following raw materials by weight in mixture ratio: 13 to 17 of boiler slag, 13 to 17 of fly ash, 8 to 12 of granolithic, 18 to 22 of carbide slag and 38 to 42 of mountain flour. When the fly ash brick is prepared, the boiler slag, the fly ash, the granolithic, the carbide slag and the mountain flour which are ground into a powder shape are mixed evenly according to the mixture ratio by weight of 13 to 17:13 to 17:8 to 12:18 to 22:38 to 42, water is added, and a mixed material with the water content of 10 to 15wt% is prepared and is autoclaved and cured to prepare a finished product after the mixed material is pressed and molded. The invention has simple technological formula, easy control of the technological operation and stable product quality and is a novel energy-saving environment-friendly process.

The invention discloses a biomass boiler slag separating machine which is composed of a tilted string vibration sieve, a ratchet wheel rolling sieve, a fine slag hopper, a coke button hopper, a large biomass block hopper and a protection plate. The string vibration sieve is composed of a flow guide plate, a plurality of tension nuts, a plurality of tension bolts and a plurality of strings. The ratchet wheel rolling sieve is composed of a plurality of ratchet wheels. The fine slag hopper is arranged below the string vibration sieve. The coke button hopper is arranged below the ratchet wheel rolling sieve. The large biomass block hopper is arranged on the lower portion of an outlet of the ratchet wheel rolling sieve. The string vibration sieve is fixed to the ratchet wheel rolling sieve through the protection plate. The biomass boiler slag separating machine has the advantages that fine boiler slag rich in potassium and coke buttons in biomass boiler slag are separated from large biomass blocks and stored in the different hoppers, concentrated landfill processing is carried out on the coke buttons, the landfill cost and landfill conveying cost are saved, large biomass blocks which are insufficiently burned can be fed into a boiler to be burned again, fuel is saved, boiler efficiency is improved, and the fine boiler slag rich in potassium can be used as farmland fertilizer.

The invention discloses an equal-bed pressure cold slag fluidized bed of a circulating fluidized bed boiler and an operation method thereof. The equal-bed pressure cold slag fluidized bed comprises a directional hood 1, a primary cold air chamber 2, a bed 3, a rectangular shell 4, a warm air pipe 5, a water cooling header 6, water cooled tube bundles 7, a boiler reject valve 8, a cold slag fluidized bed reject valve 9 and a cold slag fluidized bed reject tube 10. In the installation of the equal-bed pressure cold slag fluidized bed, the cold slag fluidized bed 3 is lower than a boiler fluidized bed by 150mm, and a plurality of rows of the water cooled tube bundles 7 are embedded in a material layer on the cold slag fluidized bed, so that the full heat exchange between water and boiler slag can be realized, and the slag can be cooled to be at a temperature below 100 DEG C. The water cooling header 6 uniformly supplies water to the water cooled tube bundles 7. The operation method is as follows: firstly, before the boiler is started, bed material is matted as thick as 350mm on the cold slag fluidized bed, and particle size of the bed material is smaller than 8mm; and secondly, as a slag discharging method at fixed period with higher frequentness is adopted, when the slag on the cold slag fluidized bed is cooled to be at the temperature of 100 DEG C, the slag can be discharged, and when differential pressure of the material layer of the clod slag fluidized bed reaches 3500Pa, the slag discharging door of the cold slag fluidized bed is closed, and then a boiler slag discharging door is opened.

The invention discloses a boiler furnace slag waste heat utilization system and a process. The boiler furnace slag waste heat utilization system is composed of a dry type slag discharging machine, a cyclone separator and a heat exchanger. An air inlet and first slag inlet of the dry type slag discharging machine are formed in the front end of the dry type slag discharging machine. A slag outlet ofthe dry type slag discharging machine is arranged at the rear end of the dry type slag discharging machine. A gas outlet of the dry type slag discharging machine is arranged on the rear portion of the dry type slag discharging machine. The first slag inlet of the dry type slag discharging machine is connected with an outlet of a boiler slag bucket. A gas outlet of the dry type slag discharging machine is connected with a gas inlet of the cyclone separator. A gas outlet of the cyclone separator is connected with an air channel inlet of the heat exchanger. An air channel outlet of the heat exchanger is connected with a primary air inlet of a boiler. A flue gas channel inlet of the heat exchanger is connected with a flue gas outlet of a wet desulfurization tower. A flue gas channel outlet ofthe heat exchanger is connected with an inlet of a chimney. By means of the boiler furnace slag waste heat utilization system and the process, furnace slag waste heat can be used for reheating post-wet-desulfurization cooled flue gas, residual waste heat can be recycled, and the gradient application of energy of the whole waste heat recycling system is realized.