20 results about "Ammonium bisulfate" patented technology

This invention discloses a desulfurization and denitrification device for power plant boiler exhaust gas, relating to the field of power plant boiler technology. It includes a first conveying pipe, which is installed on one side of the desulfurization and denitrification device body to transport exhaust gas into the interior of the device body for treatment. A flexible hose is installed at one end of the first conveying pipe; the hose can deform and vibrate under force to peel off dust and ammonium bisulfate adhesive deposits adhering to the inner wall. A force-receiving roller is installed at the bottom of the hose. A cam is installed on one side of the desulfurization and denitrification device body; the cam can rotate circumferentially to apply pressure to the force-receiving roller, driving the hose to flex and rebound. Multiple pressure-applying strips are installed on one side of the desulfurization and denitrification device body; these strips can move left and right to contact the bottom of the hose. A first plate and a second plate drive a restraining sleeve back to its original position, thereby causing reciprocating axial or radial vibration at the end of the hose, resulting in a wavy deformation along the length of the hose and axial pushing and pulling at the end of the hose.

This invention discloses a method for treating ammonium fluorosulfate byproducts, comprising providing an ammonium fluorosulfate byproduct mainly comprising ammonium fluorosulfate and a small amount of fluorosulfonic acid and bis(fluorosulfonyl)imide; mixing the ammonium fluorosulfate byproducts with water; reacting the mixture of ammonium fluorosulfate byproducts and water at a hydrolysis reaction temperature to hydrolyze the ammonium fluorosulfate, fluorosulfonic acid and bis(fluorosulfonyl)imide to form an aqueous solution of ammonium bisulfate and hydrogen fluoride; and separating the ammonium bisulfate from the aqueous solution of hydrogen fluoride.

This utility model discloses a heat exchange system for a low-calorific-value coal gas boiler, including a horizontal flue and a vertical flue. A high-temperature reheater and a low-temperature reheater are arranged in the horizontal flue, while an upper-stage air preheater and a lower-stage air preheater are arranged in the vertical flue. A left-side connecting flue and a right-side connecting flue are located on either side of the middle position between the upper-stage and lower-stage air preheaters, and a bypass flue connects the left-side and right-side connecting flues. A steam-flue gas heat exchanger is installed on the bypass flue, connecting to both ends of the flue gas heat exchange side of the steam-flue gas heat exchanger. Both ends of the steam heat exchange side of the steam-flue gas heat exchanger are connected to a steam bypass, which connects to the outlet of the low-temperature reheater and the inlet of the high-temperature reheater. This system increases the flue gas temperature of the lower-stage air preheater, reduces the possibility of ammonium bisulfate condensation, mitigates the corrosion risk of ammonium bisulfate on the heating surfaces of the lower-stage air preheater, and significantly extends the service life of the equipment. It also reduces the risk of reheater overheating and increases the flexibility of reheat steam temperature regulation.

This invention discloses a dithiophosphoryl-substituted azine compound and its synthetic method, belonging to the field of organic synthesis technology. The synthetic method uses azine compounds, phosphorus pentasulfide, and alcohols as substrates. In a membrane-free electrolytic cell, using tetrabutylammonium bisulfate as the electrolyte and acetonitrile as the solvent, a three-component dehydrogenation coupling reaction is achieved by constant current electrolysis at room temperature. No metal catalyst or external chemical oxidant is required. Inexpensive phosphorus pentasulfide serves as both the sulfur and phosphorus source. By controlling the electrolysis time, mono- or bis-dithiophosphoryl-substituted azine compounds can be selectively prepared with moderate to excellent product yields. Mechanistic studies show that the reaction proceeds via a free radical-mediated pathway. This method is mild, simple to operate, and has a wide range of applicable substrates, meeting the requirements of green chemistry and providing a new route for the efficient synthesis of functionalized phenoxazine derivatives.

This invention relates to the field of analytical detection technology, and more particularly to an iodine [ 131 [I] A method for determining the radioactive purity and iodide content in sodium iodide capsules. The method of this invention includes: determination using high-performance liquid chromatography (HPLC), wherein the mobile phase consists of mobile phase A and mobile phase B, wherein mobile phase A is a mixed solution of tetrabutylammonium hydrogen sulfate and disodium hydrogen phosphate, and mobile phase B is acetonitrile. This invention's detection method can rapidly determine the radioactive purity and iodide content of therapeutic iodine [I]. 131 The method for determining the radiochemical purity and iodide content in sodium iodide capsules is fast and possesses excellent specificity, accuracy, stability, robustness, and reliability. It is well-suited for the determination and control of radiochemical purity and iodide content. Furthermore, the establishment of this analytical method enables the determination of radiochemical purity and iodide content in therapeutic iodine capsules. 131 The accurate detection of radiochemical purity and iodide content in sodium chloride capsules has played an important guiding role in the development and optimization of formulation processes.

This invention relates to a method for adjusting the load of a rotary air preheater based on the temperature distribution characteristics of an air preheater, relating to the field of air preheaters. The method includes the following steps: obtaining the real-time temperature distribution inside the air preheater through digital twin calculations; obtaining the cold end temperature of the air preheater based on temperature sensors; obtaining the deposition temperature of ammonium bisulfate in real time based on a monitoring device; comparing the cold end temperature with the acid dew point temperature; and adjusting the opening degree of the air preheater to change the temperature distribution of the heat transfer elements in the air preheater, ensuring that not only the cold end temperature is higher than the acid dew point temperature, but also that the temperature of the hot end of the cold section heat transfer elements is higher than the deposition temperature of ammonium bisulfate. This invention has the advantages of accurately sensing the ash accumulation trend of the air preheater and simultaneously feeding back to the air preheater to adjust the air intake, achieving stable, safe, and economical operation of the rotary air preheater during boiler wide-load peak shaving.

A catalytic flue gas filter medium treatment system is provided comprising a catalytic flue gas filter medium, a hydrocarbon foulant removal element, and an ammonium bisulfate (ABS) foulant removal element. The catalytic flue gas filter medium is contaminated with at least one of hydrocarbon foulants and ABS foulants. The hydrocarbon foulant removal element and the ABS foulant removal element are configured to remove hydrocarbon and ABS foulants from the catalytic flue gas filter medium to recover catalytic activity of the catalytic flue gas filter medium.

This invention discloses a superhydrophobic coating, its preparation method, and its application in air preheaters. The preparation method includes: forming a silica gel layer on a substrate surface, heat treatment, amination treatment, and modification treatment. The superhydrophobic coating prepared by this invention has advantages such as high bonding strength with the air preheater and good hydrophobic properties. It can effectively prevent ammonium bisulfate deposition at the cold end of the air preheater, with the contact time between the superhydrophobic coating surface and the ammonium bisulfate solution reduced by 80%. Furthermore, it can maintain the stability of the air preheater for a long time in high-temperature environments. It can be widely used for cold-end corrosion protection of air preheaters, not only improving the service life of the air preheater but also ensuring the long-term stable operation of the boiler. It has high practical value and promising application prospects. The preparation method of the superhydrophobic coating of this invention also has the advantages of simple process, convenient operation, low preparation cost, and high preparation efficiency, making it suitable for large-scale preparation and facilitating the industrial application of the superhydrophobic coating.

This invention discloses a wide-load zoned regulation system and method for a tubular air preheater. The invention relates to the field of high-efficiency energy-saving technology. The model predictive control multi-objective zoned closed-loop control subsystem takes minimizing the overall exhaust temperature as the optimization objective, uses the constraint that the cold-end pipe wall temperature of each zone should not be lower than the safe reference temperature dynamically output by the zoned ammonium bisulfate phase change early warning model subsystem, and uses the opening degree of the inlet regulating damper and the opening degree of the hot air recirculation targeted regulating valve of each zone as manipulated variables. It solves a constrained quadratic programming optimization problem online and outputs the optimal control quantity for each zone. This invention achieves adaptive weighted multi-objective closed-loop optimization control for each zone through a model predictive control algorithm, dynamically coordinating the safety protection priority of each zone with the overall heat exchange efficiency, reducing the overall air leakage rate by more than 1.5%, and consequently reducing the power consumption of the forced and induced draft fans.

The application discloses a rotary air preheater capable of preventing ammonium bisulfate blockage, wherein a flue gas flow area of the rotary air preheater is divided into a plurality of flue gas sub-areas; a gas burner is arranged in each flue gas sub-area; the gas burner is ignited regularly during normal operation of the rotary air preheater; high-temperature flue gas generated by the gas burner is used for heating heat storage elements in a flue gas heat exchange area; the temperature gradually increases to 260-270 DEG C; ammonium bisulfate adhered to the heat storage elements in the heat exchange sub-area is decomposed into gas at the temperature, so that the heat storage elements in the area are dredged. The heat exchange area in the rotary air preheater is heated to increase the temperature, decompose ammonium bisulfate, clean blockage on line in each load section, and the difference between the primary hot air temperature, the secondary hot air temperature and the flue gas discharge temperature and the design value is small, so that the boiler combustion and the subsequent dust collector of the air preheater are not adversely affected.

The application relates to a preparation method and application of an amorphous low-temperature denitration catalyst resistant to water and ammonium bisulfate poisoning, and belongs to the technical field of selective catalytic reduction catalysts. The problems that existing catalysts are difficult to simultaneously maintain high activity and high stability in a complex atmosphere of ultralow temperature, liquid water and ammonium bisulfate deposition are solved. The catalyst is prepared by the following steps: mixing glacial acetic acid, anhydrous ethanol and ethylene glycol according to a volume ratio of (0.1-3):(1-5):1 to obtain a first solution; adding a template agent and concentrated hydrochloric acid to stir to obtain a second solution; adding manganese, titanium, cerium, niobium and additive precursors to stir to obtain a third solution; adding urea to stir to obtain a fourth solution; adding a hole expanding agent to stir to obtain a fifth solution; after reaction, washing and drying, the fifth solution is subjected to secondary reaction, washing and drying, and then is subjected to precalcination in an inert atmosphere and air calcination to obtain the amorphous denitration catalyst. The catalyst exhibits excellent denitration activity and stability under the conditions of containing liquid water and ammonium bisulfate.

The application relates to the technical field of graphene material preparation and functional composite material, and discloses a preparation method of acid-free microwave-assisted and plasma-treated reduced graphene oxide, which comprises six core steps of sequentially performed electrochemical stripping, hydrogen peroxide post-functionalization, washing and purification, freeze drying, microwave expansion and oxygen plasma treatment, and the specific steps are as follows: step one, first electrochemical stripping, high-purity graphite raw materials are selected, a polypropylene material electrochemical reactor is taken as a reaction container, and 1.2 kg of graphite raw materials are fixed as an anode assembly. In the application, ammonium bisulfate (NH4HSO4) electrolyte is used to replace strong inorganic acid, the pH value of the system is controlled to be 2-3, no toxic gas is generated in the reaction process, the wastewater only contains ammonium salt and sulfate salt, and the wastewater can be discharged after simple neutralization treatment (the treatment cost is reduced by 70%); the corrosion of strong acid to equipment and the safety risk of personnel are avoided, the service life of the equipment is prolonged by 50%, and the safety production coefficient is significantly improved.

A device for preventing ammonium bisulfate blockage in a flue gas heater, relating to the field of flue gas heater technology, includes a housing. Inside the housing, from front to back, are arranged a first gradient heating area, a second gradient heating area, and a third gradient heating area. Multiple heat exchange tubes are arranged in a rectangular array within each of the three heating areas, and these tubes are connected by connecting pipes. A controller is installed at the top of the housing to heat the heat exchange tubes in different areas. An ultrasonic vibration mechanism is provided at the bottom of the housing, and a base is located below the housing. Shock-absorbing mechanisms are installed at the four corners between the base and the housing. This solution solves the problem of blockage caused by solidified ammonium bisulfate adhering to the surface of the flue gas heater.

This invention discloses a fluorine-free, high-flux, anti-adhesion fiber membrane filter material and its preparation method, belonging to the technical field of high-temperature flue gas filter materials. The filter material consists of a polyphenylene sulfide (PPS) needle-punched felt substrate layer, a PPS melt-blown membrane layer, and a sepiolite-PDMS composite anti-adhesion coating loaded on the membrane surface. The anti-adhesion coating is composed of hydrophobically modified sepiolite fibers coated with polydimethylsiloxane, forming a three-dimensional permeable network structure with properties such as being fluorine-free, superhydrophobic, high-temperature resistant, and anti-adhesive. The filter material prepared by this invention exhibits excellent anti-clogging properties, low resistance, high filtration efficiency, and long service life under high-temperature, high-humidity flue gas environments containing viscous substances such as ammonium bisulfate. It solves the technical problems of traditional coated filter media being prone to adhesion, difficult to clean, and short-life. Furthermore, its fluorine-free nature enables environmentally friendly closed-loop systems, meeting the requirements of sustainable development.

This invention relates to the field of detection and analysis technology, and discloses a method for detecting perfluorooctanoic acid (PFOA) in water. The method includes the following steps: filtering a water sample through a filter membrane and collecting the filtrate; using a C18 reversed-phase chromatographic column, with an aqueous solution containing tetrabutylammonium bisulfate as mobile phase A and acetonitrile as mobile phase B, isocratic elution is performed at a detection wavelength of 208-215 nm, and detection is performed using a UV detector or a diode array detector; qualitative analysis is performed based on chromatographic retention time, and quantitative analysis is performed using the external standard method based on chromatographic peak area. This invention, by optimizing the detection wavelength and introducing tetrabutylammonium bisulfate as an ion-pairing reagent, effectively improves the chromatographic peak shape and resolution of PFOA, achieving a correlation coefficient R0 within a wide linear range of 0.5-200 mg / L. 2 The detection limit is >0.999, which meets the detection requirements of most water bodies; the method has good repeatability, with a spiked recovery rate of up to 98.30%-108.35% in complex matrices; it has strong anti-interference ability, and the detection results are stable in the pH range of 4-10, making it suitable for actual water samples under different acid and alkaline conditions.

This invention provides a water-soluble toltrazuril solid powder, its preparation method, and its application. The water-soluble toltrazuril solid powder is a solid adsorption complex formed by toltrazuril and an adsorption ligand under alkaline conditions. The adsorption ligand is any one of tris(hydroxymethyl)aminomethane, tetrabutylammonium bisulfate, dodecyltrimethylammonium chloride, and N-ethylpiperazine. The molar ratio of toltrazuril to the adsorption ligand in the solid powder is 1:(1.1-1.3). It can dissolve rapidly without stirring under still drinking water conditions, and no drug precipitation occurs after long-term storage after dilution, thus meeting the needs of the aquaculture and pet breeding industries for convenient, stable, and efficient anticoccidial administration programs.

The utility model discloses a kind of air preheater unblocking systems, including rotary air preheater, inlet flue, outlet flue, primary fan and connected primary air inlet air duct, primary air outlet air duct, secondary fan and connected secondary air inlet air duct, secondary air outlet air duct;Its characterized in that: secondary air inlet air duct and secondary air outlet air duct are connected by secondary air bypass air duct, and damper adjusting baffle and pressure transmitter are equipped on secondary air bypass air duct;The utility model controls the metal wall temperature of air preheater by adjusting the secondary air volume entering air preheater, can completely solve the problem of ammonium bisulfate blockage, and greatly reduce the maintenance workload of unit and additional energy consumption, with the advantage of good economy.

The present application belongs to the technical field of denitrogenation control, and provides a multi-parameter coordinated catalytic oxidation denitrogenation system control method, which comprises the following steps: through cross verification of oxygen content, flue gas temperature, ammonia injection amount, differential pressure and outlet NOx data, abnormal coupling analysis of induced draft fan frequency and differential pressure, outlet NOx and ammonia injection amount is carried out, whether there is ammonium bisulfate initial blockage sign is judged; if there is, the differential pressure rising rate and the catalyst activity attenuation degree are evaluated, the matching degree of ammonia injection amount and temperature window is analyzed to identify the vicious cycle risk, and the remaining safe operation time is predicted; based on the remaining time and the current temperature, the minimum temperature rise amplitude and the temperature rise rate are calculated combined with the flue gas humidity and the concentration, the temperature rising equipment is started, and the ammonia injection is switched to the amplitude limiting manual control; the emergency intervention parameters are solidified as the start-stop machine special collaborative control strategy, the automatic locking ammonia adding interlock protection is established, the early warning, accurate risk assessment and autonomous collaborative control of ammonium bisulfate blockage can be realized.