288 results about "Sulfur trioxide" patented technology

A system and method for amending out of specification ash to a suitable amended addition material to a concrete mixture includes analyzing a unit quantity of out of specification ash to determine concentrations of each of calcium oxide, sulfur trioxide, and unburnt carbon. The out of specification ash is sieved to determine fineness. Based upon measured concentrations and determined fineness, a mixture is designed to add materials in design-determined quantities of each of quicklime, kaolin, masonry silica blend, manufactured sand and in specification fly ash. By adding each of the quicklime, kaolin, masonry silica blend, manufactured sand and in specification fly ash in each of the design-determined quantities, creating an amalgamated blend of added materials to form an amended addition material. The amended addition material is substituted for a selected quantity of Portland cement in the concrete mixture.

The invention discloses a preparation device and a preparation method of electronic-grade sulfuric acid. The device mainly comprises a sulfuric acid storage tank, a wiped-film evaporator, a liquid storage tank, a sulfur trioxide absorption tank, a packing absorption tower, a heat exchanger, a filter and the like. A fuming sulfuric acid storage tank is conveyed to a wiped-film evaporator through a diaphragm pump to evaporate sulfur trioxide, the evaporated sulfur trioxide is subjected to circular absorption reaction to generate sulfuric acid, and electronic-grade sulfuric acid is obtained after filtration. The method is simple in technological process, low in evaporation process temperature, high in efficiency and low in metal residue, and high-quality electronic-grade sulfuric acid is obtained.

The invention belongs to the technical field of masonry cement, and particularly discloses all-solid-waste low-carbon-emission masonry cement and a preparation method thereof. Comprising the following steps: 1, finely grinding iron tailings, carbide slag, fly ash and silica fume, and proportioning according to a design to obtain a cement raw material; 2, agglomerating or pelletizing the cement raw material, and calcining according to a designed temperature to obtain a cement clinker; and 3, mixing the cement clinker with a certain proportion of gypsum, and grinding to the target fineness to obtain the masonry cement. The masonry cement is prepared from all solid wastes, meanwhile, a calcium source is mainly provided by the carbide slag with low carbon emission, compared with cement fired by calcium carbonate calcium sources, the carbon emission is greatly reduced, the goal of high-valued and green utilization of various solid wastes including iron tailings is achieved, and the method is suitable for industrial production. The compressive strength, the sulfur trioxide content and the screen residue of the prepared masonry cement meet the national standard requirements of masonry cement. In addition, the masonry cement is prepared from all solid waste raw materials, so that the preparation cost of the masonry cement is reduced.

The invention relates to the technical field of separation and evaporation of sulfur trioxide, and discloses a device and a process for producing liquid sulfur trioxide by utilizing a film evaporator, the separation of gas-phase sulfur trioxide and low-concentration fuming acid is realized by utilizing the film evaporator, and the liquid sulfur trioxide is separated from the low-concentration fuming acid under the action of gravity and a rotary movable scraper of the film evaporator. Nicotinic acid forms an underspin film on the inner wall of the cylinder wall, and liquid is distributed into a uniform film, so that sulfur trioxide is quickly evaporated, and the evaporation capacity per unit area can be about 6-9 times that of a traditional evaporator; and meanwhile, under the action of high-speed rotating film scraping of the circumference, the heating time is short, the retention time of low-concentration nicotinic acid on the wall surface is shortened, and corrosion of the low-concentration nicotinic acid to the inner wall of the cylinder body at high temperature is avoided. According to the invention, the cyclone is arranged in the film evaporator, so that the material is prevented from being carried by gas, the removal efficiency of fog drops with the particle size of more than 1 micron reaches more than 99.9%, and the evaporation rate can be effectively improved by 1.0-2.6%.

The utility model provides a reaction system for continuously synthesizing dimethyl sulfate, which comprises an absorption module I, an absorption module II, a reaction module I, a reaction module II and a pipeline module, the absorption module I and the absorption module II respectively comprise an absorption tower, a circulating tank, a circulating pump and a condenser, the reaction module I and the reaction module II respectively comprise a reaction tower, a circulating tank, a circulating pump and a condenser, and the pipeline module comprises a sulfur trioxide feeding pipeline, a dimethyl ether feeding pipeline, a crude dimethyl sulfate feeding pipeline, a tail gas conveying pipeline and a product conveying pipeline. The reaction system disclosed by the utility model realizes continuous generation of dimethyl sulfate, is simple to operate, low in device investment, high in reaction rate and high in yield, and provides a guarantee for realizing large-scale industrial production.

The invention discloses a continuous preparation method of sodium tanshinone IIA sulfonate based on a single-tube thin-layer liquid membrane reactor. Comprising the following steps: (1) dissolving tanshinone IIA in an organic solvent as a feed liquid; (2) reacting gas-phase sulfur dioxide with air, and cooling to obtain sulfur trioxide mixed gas; (3) enabling the feed liquid and sulfur trioxide mixed gas to enter a single-tube thin-layer liquid membrane reactor in a parallel flow or reverse flow manner, and carrying out continuous sulfonation reaction to obtain reaction liquid; and (4) adding a sodium salt aqueous solution into the reaction solution to carry out salt forming reaction, centrifuging, drying and purifying to obtain the tanshinone IIA sodium sulfonate. According to the invention, a novel method is adopted to carry out sulfonation reaction on tanshinone IIA, and sulfur trioxide is basically completely consumed after the reaction is finished, so that the generation of waste acid is greatly reduced, and the method has important significance on environmental protection and cost reduction. The green, safe, efficient and continuous preparation of the high-purity tanshinone IIA sodium sulfonate is realized.

Methods and associated production plants are disclosed for producing concentrated oleum or sulfur trioxide therefrom with high purity, and particularly with minimal sulfur dioxide. The methods involve use of a single contact, single absorption sulfuric acid plant operating under an unconventional set of parameters including: reacting sulfur and high purity oxygen in a combustion reactor to form sulfur dioxide at a concentration between 11.5 and 20% by volume and with an atypical oxygen to sulfur dioxide molar ratio ≥ 1; atypically catalytically converting > 96% by volume of the sulfur dioxide to sulfur trioxide in a contact apparatus; and atypically recycling > 95% by volume of the total gases from an absorption apparatus to the combustion reactor. Concentrated oleum with < 300 ppm dissolved sulfur dioxide can desirably be produced with sulfur utilization ≥ 80% using a smaller, cost-effective sulfuric acid plant. The co-production of unnecessary sulfuric acid can also be reduced.

The invention provides a coal-based solid waste foamed cement material for filling a coal mine tunnel and a preparation method of the coal-based solid waste foamed cement material. The coal-based solid waste foamed cement material comprises 10-30 parts of coal gasification coarse slag micro powder, 0-30 parts of first-grade fly ash, 70-90 parts of cement, 0.3-0.8 part of a foam stabilizer and 0.1-0.5 part of an additive, the coal-based solid waste foamed cement material is further doped with foam, the mixing amount of the foam is 2-5 times of the volume of the cement slurry, the coal gasification coarse slag micro powder is coal water slurry furnace gasification coarse slag, and the coal gasification coarse slag micro powder is prepared from, by mass, 40% of silicon dioxide, 19% of aluminum oxide, 15% of ferric oxide, 16% of calcium oxide, 3% of sulfur trioxide, 3% of sodium oxide, 1% of magnesium oxide and 0.5% of titanium oxide. And 0.5% of potassium oxide. According to the invention, a physical foaming method is utilized, coal-based solid waste is used as a raw material to replace part of cement, and the foamed cement material with light weight and high strength is prepared, so that the foamed cement material meets the use requirements of underground roadway filling.

The invention belongs to the field of medicine, health and health, and particularly relates to a preparation method for controllably synthesizing polysulfonic acid mucopolysaccharide with different molecular weights, which comprises the following steps: reaction, acid-base neutralization, formamide removal by alcohol precipitation, desalting and freeze-drying. Wherein the reaction process comprises the following steps: adding sodium chondroitin sulfate and a pyridine sulfur trioxide complex into a mixed solvent of N, N-dimethylformamide and dimethyl sulfoxide, and heating for reaction to obtain a reaction mixture; the volume fraction of the dimethyl sulfoxide in the mixed solvent is 0-80%. According to the method, the low-price pyridine sulfur trioxide complex (about 150 yuan / 500g) is used, and the ratio of N, N-dimethylformamide to dimethyl sulfoxide in the mixed solvent is adjusted, so that the solubility of the chondroitin sulfate sodium and the pyridine sulfur trioxide complex is changed, and the polysulfonic acid mucopolysaccharide with molecular weights in different ranges can be regulated and generated.

The invention relates to the technical field of sulfuric acid production, in particular to a flue gas separation and purification system applied to preparation of electronic-grade sulfuric acid. Comprising a primary treatment tank for removing flue gas impurities, a secondary treatment tank for absorbing sulfur trioxide gas in flue gas, an evaporation tower for evaporating the sulfur trioxide gas from nicotinic acid and a condensation tank for efficiently liquefying the sulfur trioxide gas, impurities and sulfur trioxide gas in flue gas are deeply removed and efficiently enriched through the multi-stage treatment tank in a dual mode of liquid film absorption and spraying absorption, nicotinic acid is subjected to multi-stage evaporation through the preheating cylinder and the evaporation pipe, and separation and purification of the sulfur trioxide gas are achieved in cooperation with the condensation tank and the condensation assembly. And multi-stage condensation treatment combining path extension type pre-condensation, small-strand distributed type secondary condensation and dynamic rotary type comprehensive condensation is carried out, so that an efficient and high-quality condensation purification effect is further achieved.

The present disclosure provides anionic citrate-based composition for use in regenerative applications. The disclosed composition may take the form of a scaffold and generally includes (i) a citrate component, (ii) a diol, and (iii) an anionic moiety. The anionic moiety may include one or more of a sulfate, sulfonate, phosphate, phosphonate, sulfamate, or carboxylic acid, The sulfate and / or sulfonate containing moiety may be conjugated via an amidation reaction, esterification, and / or substitution reaction with a sulfur trioxide complex. A peptide may be conjugated to a surface of the composition.

The utility model relates to the technical field of environmental protection, in particular to a down-flow type peculiar smell purification system for a pot-type calcining furnace. Comprising a down-flow pot-type calcining furnace, the air outlet end of the down-flow pot-type calcining furnace is connected with a dust remover, and the dust remover is connected with an exhaust chimney through an exhaust pipe; a gate valve is arranged on the exhaust pipe; an induced draft fan is arranged on the exhaust pipe between the gate valve and the dust remover; the lower end of the gate valve is connected with a drainage pipeline; the drainage pipeline is connected with a return flue gas conveying pipeline; and the return flue gas conveying pipeline is connected with an air door of the downstream pot-type calcining furnace through a branch pipeline. A down-flow pot-type calcining furnace peculiar smell purification system is the earliest attempt in the same industry of carbon; the harm of poisonous and harmful gases such as sulfur dioxide, sulfur trioxide, nitrogen oxide, dust, carbon monoxide and carbon dioxide in the flue gas of the dust remover of the calcining furnace to post staff is solved.

The invention discloses a method for jointly recovering zinc and cadmium from zinc-cadmium slag of zinc hydrometallurgy. The method comprises the following steps: S1, carrying out acid leaching on the zinc-cadmium slag and adding zinc powder for replacement; s2, sponge cadmium is subjected to vacuum melting; s3, adding clear water and calcium oxide into the cadmium alkaline residues for wet grinding, filtering to obtain clear liquid and filter residues, and returning sodium hydroxide obtained after the clear liquid is evaporated and crystallized to S2; s4, the filter residues are subjected to reduction roasting, recyclable zinc-cadmium smoke dust, calcium oxide residues and sulfur trioxide are obtained, the calcium oxide residues are returned to S3, sulfuric acid is prepared from sulfur trioxide, and a part of sulfuric acid is returned to S1; the other part of sulfuric acid enters the next step; s5, the smoke dust is dissolved with sulfuric acid, a sulfuric acid solution containing zinc and cadmium is obtained, then zinc powder is added for replacement, and sponge cadmium and a zinc sulfate solution are obtained; the sponge cadmium returns to S2, and the zinc sulfate returns to S1. According to the method, the cadmium alkaline residue treatment product can be effectively recycled and utilized, the cadmium alkaline residue treatment cost is reduced, no cadmium element flows out of the process to cause environmental pollution, and the method is an environment-friendly process method.

The invention relates to the field of sulfur-containing waste treatment, and discloses a method and a system for recovering sulfur element in sulfur-containing waste, and the method comprises the following steps: firstly, decomposing the sulfur-containing waste into first process gas containing sulfur dioxide; carrying out a first catalytic oxidation reaction on the first process gas, and condensing to obtain a second process gas; performing a second catalytic oxidation reaction on the second process gas, and condensing to discharge tail gas to be treated; according to the method, sulfur-containing waste is decomposed into gas containing sulfur dioxide through the reaction furnace, sulfur dioxide is catalytically oxidized into sulfur trioxide through the reaction tower, sulfur trioxide is condensed into concentrated sulfuric acid through the condensing tower, and the sulfur element recovery liquid is obtained. The sulfur-containing waste is decomposed into process gas containing sulfur dioxide in the reaction furnace, and the recovery rate of the sulfur element is not lower than 99% through two times of catalytic oxidation and two times of condensation.

The invention discloses a denitration and dust removal fault analysis system and method based on ammonia-sulfur ratio calculation, relates to the technical field of environment-friendly emission of coal-fired power plants, and realizes early warning and intelligent response to faults of a denitration system. The method comprises the following steps: collecting flue gas parameters, coal quality parameters and unit parameters; calculating the ammonia escape concentration based on the ammonia spraying amount in the flue gas parameters and the unit parameters to obtain an ammonia escape concentration predicted value; determining a sulfur dioxide concentration and a target conversion rate according to the coal quality parameters and the unit parameters, calculating a sulfur trioxide concentration according to the sulfur dioxide concentration and the target conversion rate, and calculating an ammonia-sulfur ratio according to the sulfur trioxide concentration and an ammonia escape concentration prediction value; determining the generation amount of ammonium bisulfate, and reading the equipment temperature in the unit parameters; and according to the ammonium bisulfate generation amount, the ammonia-sulfur ratio and the equipment temperature, determining an early warning grade and a response measure, adopting an execution mechanism module to execute the response measure, and sending an early warning signal corresponding to the early warning grade to a specified terminal.

The invention relates to the technical field of concentrated sulfuric acid production, and particularly discloses a sulfuric acid thickening device which comprises a waste acid regeneration unit for burning sulfur-containing waste acid and acid gas to produce sulfuric acid and a sulfuric acid thickening unit for thickening the sulfuric acid generated by the waste acid regeneration unit, the sulfuric acid thickening unit comprises a combustion chamber, and liquid sulfur is combusted in the combustion chamber to generate sulfur dioxide. A steam generating device is arranged in the combustion chamber, the combustion chamber is connected with the reactor through a process gas conveying pipe, sulfur dioxide is subjected to a catalytic reaction in the reactor to generate sulfur trioxide, and the reactor is connected with the absorption tower through a process gas discharging pipe; unqualified sulfuric acid and reflux sulfuric acid in the waste acid regeneration unit absorb sulfur trioxide in an absorption tower to generate sulfuric acid, and the sulfuric acid is thickened; the invention also provides a method for producing concentrated sulfuric acid by using the device. According to the device, sulfuric acid with the concentration lower than 98wt% can be prepared into concentrated sulfuric acid with the concentration higher than 98wt%, the product income is increased, meanwhile, steam is generated as a byproduct, and the benefits of the device are increased.

Provided herein are methods and systems for treating a sulfur dioxide-containing gaseous stream. The method includes combusting a tail gas in an excess of oxygen gas to yield a thermal oxidizer effluent containing sulfur dioxide and oxygen. The thermal oxidizer effluent is introduced to an oxidative catalytic converter to convert sulfur dioxide to sulfur trioxide, thereby forming an oxidized gas stream. The oxidized gas stream is routed to a quench tower and contacted with a dilute aqueous acid quench stream to yield sulfurous acid, hydrated sulfur dioxide, or both. The sulfurous acid or hydrated sulfur dioxide is oxidized with the excess of oxygen from the thermal oxidizer effluent to yield sulfuric acid.

The invention discloses a sulfur-containing waste gas and waste liquid treatment method and equipment, and particularly relates to the technical field of sulfur-containing waste gas and waste liquid treatment.The sulfur-containing waste gas and waste liquid treatment method is characterized in that a cracking incineration unit, a catalytic oxidation unit, a condensation and concentration unit and a tail gas purification unit are included; sulfur-containing waste gas and waste liquid are sequentially cracked and incinerated into sulfur dioxide, then converted into sulfur trioxide and condensed to form sulfuric acid, sulfur dioxide in tail gas is converted and washed to form dilute acid, sulfuric acid trioxide mist in the tail gas is removed under the action of a high-voltage electric field, and the tail gas is discharged from a chimney. And the effects of ultra-clean emission and high total sulfur recovery rate are achieved under the condition of meeting tail gas emission indexes.

The invention discloses a system and a method for preparing sulfuric acid from sulfur foam and desulfurization waste liquid. The system is formed by sequentially connecting a pretreatment unit, an incineration cooling unit, a dust removal filtering unit, a conversion unit, an acid forming unit and a desulfurization unit. The pretreatment unit is used for preparing liquid sulfur and salt slurry from sulfur foam, the incineration cooling unit is used for preparing sulfur dioxide gas, the dust removal filtering unit is used for removing dust in flue gas, the conversion unit is used for converting sulfur dioxide in the flue gas into sulfur trioxide, and the acid forming unit is used for combining the sulfur trioxide in the flue gas with water into sulfuric acid steam; the sulfuric acid steam is condensed into sulfuric acid and then is conveyed into a sulfuric acid storage tank to be stored, and the desulfurization unit is used for removing trace sulfur dioxide from the flue gas conveyed by the acid forming unit. Sulfur foam and desulfurization waste liquid generated after purification and desulfurization in the coking plant are converted into sulfuric acid raw materials needed by an ammonium sulfate workshop in the coking plant, no dilute sulfuric acid or desulfurization product is discharged in the production process, heat is fully utilized, the amount of byproduct steam is large, and waste is turned into wealth.

The invention provides a sulfur trioxide monitoring and emission control optimization adjustment method, and belongs to the technical field of optimization adjustment, and the method comprises the steps: carrying out the real-time synchronous monitoring of sulfur trioxide in supercritical boiler flue gas through different types of sensors, carrying out the data preprocessing and data fusion processing of a synchronous monitoring result, and carrying out the real-time monitoring of the sulfur trioxide in the supercritical boiler flue gas; and correcting the processed data by combining a correction model established with the parameters of the supercritical boiler, carrying out deep mining on historical monitoring data, historical operation parameters of the supercritical boiler and historical operation states of the flue gas treatment equipment, establishing a sulfur trioxide control model, and carrying out real-time monitoring on the sulfur trioxide control model. And a cooperative control instruction of the flue gas treatment equipment and desulfurization adjustment parameters in a desulfurization system are determined according to an output result, optimization control adjustment is performed, a model is established, an effective control result is output through analysis of a current monitoring result, and optimization and regulation of the equipment are intelligently realized.

The invention discloses a treatment process and a treatment system for crystallization of photovoltaic wastewater calcium fluoride sludge, limestone particles and photovoltaic sludge are mixed according to a mass ratio of 3%-5% to obtain a homogeneous mixed material, the homogeneous mixed material is pre-dried and then fed into a rotary kiln, sintering is carried out at 1200-1500 DEG C for 1.5-3 hours, and the sintered material is cooled to room temperature. Calcium fluoride is attached to the surface of the silicate framework, sulfur trioxide and calcium oxide are released at the same time, after sintering is finished, the material is subjected to annealing treatment in a rotary kiln, calcium fluoride seed crystals accounting for 0.1%-1.0% of the total mass of the material are added, calcium fluoride crystals are induced to grow directionally and be repaired, and the calcium fluoride is obtained. According to the method, the purity of calcium fluoride is increased to 75%-85%, the sulfur content in the product can be controlled to be 0.1% or below, and the cold compressive strength of the pellets prepared from the product reaches 2.5 MPa or above.

The invention relates to a method for removing cyclohexane in a low-molecular brominated polystyrene recovery solvent, which comprises the following steps: adding the recovery solvent containing cyclohexane and dichloromethane into a reaction bottle, and then adding a certain amount of fuming sulfuric acid; stirring and reacting for a period of time at a certain reaction temperature; adding water for quenching, standing for layering, washing an organic layer to be neutral, and standing for layering; and rectifying the organic layer, and collecting corresponding fractions. The used fuming sulfuric acid contains excessive sulfur trioxide, the sulfonation capacity is higher, cyclohexane is sulfonated to generate sulfonic acid group cyclohexane, then the sulfonic acid group cyclohexane is removed through water washing, the removal rate is high, the operation is convenient and fast, the cost is low, and the method is suitable for industrial production.

The application discloses a flue gas recovery system in a calcination zinc sulfide process and relates to the technical field of zinc sulfide production. The flue gas recovery system comprises, which are connected by pipelines in sequence, a waste heat recovery boiler, a bag-type dust collector, an electrostatic precipitator, a mixed converter, a cyclone separator, an absorption tower and a spray tower. The mixed converter comprises an outer cavity, an inner cavity and a tail gas inlet pipe. The tail gas inlet pipe is connected with one end of the inner cavity. The outer cavity is provided with a medium inlet at the end far from the tail gas inlet pipe. The outer cavity is provided with a medium outlet at the end far from the medium inlet. The inner cavity is provided with a tail gas outlet pipe at the end far from the tail gas inlet pipe. An oxygen inlet and a powder inlet are installed on the side wall of the inner cavity. The inner cavity is internally provided with a turbulence column. Under the guidance of the turbulence column, the tail gas, oxygen and catalyst powder can be fully mixed, which can accelerate the reaction speed of sulfur dioxide and oxygen in the tail gas, thereby accelerating the generation speed and quality of sulfur trioxide.

The present disclosure relates to a process for purification of an aqueous solution comprising hydrogen sulfide comprising the steps of a. directing an amount of recycle gas to contact the aqueous solution comprising hydrogen sulfide, to separate a gas comprising hydrogen sulfide from the aqueous solution, b. heating said gas comprising hydrogen sulfide optionally after addition of a source of oxygen to provide a process feed gas, c. in a hydrogen sulfide oxidation step directing said process feed gas to oxidation of hydrogen sulfide to sulfur dioxide, d. in a sulfur dioxide oxidation step directing said sulfur dioxide rich gas to contact a material catalytically active in oxidation of sulfur dioxide to sulfur trioxide, to provide a sulfur trioxide rich gas e. in a condensation step cooling said sulfur trioxide rich gas, to enable hydration of sulfur trioxide and condensation of sulfuric acid to provide a stream of concentration sulfuric acid and a purified process gas, and in a recycling step, directing at least a part of the purified process gas as said recycle gas.

The invention provides a method for analyzing the influence of a supercritical boiler flue gas treatment facility on sulfur trioxide emission, and belongs to the technical field of influence analys.The method comprises the steps that sampling probes are arranged at different target positions of a supercritical boiler flue, sampling frequencies are set according to boiler operation conditions and research requirements, and multi-point synchronous sampling is conducted on flue gas; determining the concentration of sulfur trioxide at each target position, and meanwhile, monitoring the temperature, pressure and flow velocity of the flue gas at the target position in the sampling process as supplementary results; determining the optimal operation parameters of the flue gas treatment facility by combining the current operation parameters of the supercritical boiler; collecting current operation parameters of the flue gas treatment facility, and determining an influence coefficient of the flue gas treatment facility on sulfur trioxide emission; and determining a control set according to the influence coefficient in combination with an operation attenuation factor of the flue gas treatment facility. The reasonable analysis on the influence and the dynamic optimization on the operation of the flue gas treatment facility are realized.

The invention discloses a heat exchanger suitable for a glass tube containing sulfur trioxide, and particularly relates to the technical field of sulfuric acid preparation heat exchange, the heat exchanger suitable for the glass tube containing sulfur trioxide is characterized in that the heat exchanger comprises a heat exchanger main frame, the bottom of the heat exchanger main frame is provided with a through hole for sulfur trioxide steam to enter and sulfuric acid liquid to flow down, and the through hole is communicated with the heat exchanger main frame. A process gas outlet is formed in the top of the heat exchanger main frame, a heat exchange cavity is formed in the heat exchanger main frame, a detachable modularized heat exchange module is arranged in the heat exchange cavity, and heat exchange is conducted on sulfur trioxide steam passing through the heat exchange module through a cooling medium circulating in the heat exchange module; the sulfuric acid corrosion resistance of the heat exchanger can be effectively improved through the PFA lining and the modified PTFE spraying pore plate, the heat exchanger is easy to install and deploy in various spaces through the detachable modularized heat exchange module, a fault module can be rapidly positioned and replaced during maintenance, the downtime is remarkably shortened, and the production continuity is powerfully guaranteed.

The invention provides an air pre-heater anti-blocking method and system based on sulfur trioxide monitoring, and the method comprises the steps: estimating a sulfur trioxide concentration original value based on coal quality analysis, equipment description and field testing; a sulfur trioxide sampling device and instrument analysis are combined, and sulfur trioxide concentration sampling values of an inlet and an outlet of a dust remover, a desulfurization inlet and an inlet of a chimney are respectively tested by using a representative point sampling method; based on the original value of the sulfur trioxide concentration and the sampling value of the sulfur trioxide concentration, determining a generation and conversion rule and emission characteristics of the sulfur trioxide, and establishing a sulfur trioxide monitoring technical route; determining a sulfur trioxide emission reduction scheme based on the sulfur trioxide monitoring technical route and the flue gas treatment facility operation parameters; according to the air pre-heater anti-blocking method, the air pre-heater operation parameters and the sulfur trioxide emission reduction scheme are combined, the air pre-heater anti-blocking measures are generated, facility parameters are optimized through sulfur trioxide monitoring and emission characteristics, then air pre-heater blocking is prevented, and the air pre-heater anti-blocking effect is effectively improved.

The application relates to the technical field of biomass utilization, and relates to a continuous preparation technology of furfural from corncob, which comprises the following steps: S1: corncob is crushed into powder, then is mixed with sulfur trioxide, and is subjected to steam explosion under steam pressure; S2: acid catalysis-extraction reaction; S3: the once-extracted phase is subjected to solid-liquid separation, the liquid phase is subjected to secondary extraction by using an extracting agent, and a secondary extraction phase is obtained; S4: the once-extracted phase and the secondary extraction phase are combined and are sent into a rectifying tower for rectification, and furfural with a purity greater than 99% is obtained. The application has the beneficial effects that: 1. after the corncob is crushed, the corncob is mixed with sulfur trioxide and is subjected to steam explosion, hemicellulose can be effectively stripped from lignin, the subsequent reaction of preparing furfural from hemicellulose by acid catalysis can be more easily carried out, and the yield is higher; 2. in the method, acetic acid and aluminum chloride are used as mixed acid catalysts, the reaction temperature is reduced by 20-40 DEG C compared with one-pot method, and the reaction pressure is reduced by 0.4-0.7 MPa.G compared with one-pot method, so that the requirement of the reaction on equipment is reduced.

The present application relates to the technical field of lithium battery positive electrode materials, and specifically relates to a preparation method for a conductive carbon-coated additive for a lithium battery positive electrode material, and a use thereof. The preparation method comprises: step I, using a gas plasma process to carry out surface modification on a carbon nanotube so as to obtain a modified carbon nanotube, wherein the modified carbon nanotube is a hydrogenated carbon nanotube or an ammoniated carbon nanotube; step II, using a sulfur trioxide sulfonation method to carry out sulfonation treatment on organic carbon and the modified carbon nanotube so as to obtain a sulfonated carbon material; and step III, mixing the sulfonated carbon material and water, carrying out sanding treatment on the mixed solution, and uniformly dispersing to obtain a conductive carbon-coated additive as a lithium iron phosphate or lithium manganese iron phosphate carbon-coated additive. The conductive performance of positive electrode materials can be effectively improved.

The invention relates to an aromatic hydrocarbon sulfonation method and system using sulfur trioxide, and relates to the technical field of fine chemical raw material synthesis, and the aromatic hydrocarbon sulfonation method using sulfur trioxide comprises the steps of reactant pumping, main reaction, temperature judgment, ambient temperature judgment I and ambient temperature judgment II. The reaction temperature can be adjusted under different temperature conditions, the probability of byproducts is gradually reduced in the reaction process, and then the generation of the byproducts is reduced after the reaction is finished.