90 results about "Ammonium bisulfate" patented technology

The invention belongs to the technical field of boiler waste heat, gas and pressure utilization, and particularly relates to a lifting type intelligent soot blowing system and method for low-temperature area deposited soot, and the soot blowing system comprises a primary air pressurization soot blowing system, a vertical guide rail advancing soot blower and an intelligent control module. And the intelligent control module uses a blockage prediction intelligent algorithm and a dynamic soot blowing strategy. The primary air pressurization soot blowing system leads out part of dust-free primary air from an outlet of a boiler air pre-heater to serve as soot blowing primary air, and the dust-free primary air is conveyed to a lifting soot blower driven by a vertical guide rail after being pressurized to 0.5-0.8 MPa. The primary air pressurization soot blowing system is deeply coupled with the low-temperature economizer warm flue gas system, primary air is used as a soot blowing medium, the temperature of the soot blowing medium is about 320-350 DEG C, ammonium bisulfate condensate can be effectively dried and removed, and fly ash adhesion is reduced; and the soot blowing coverage rate reaches 100%, soot blowing according to needs is achieved, and the operation stability and economical efficiency of the unit are remarkably improved.

The invention relates to the technical field of SCR (Selective Catalytic Reduction) denitration system equipment, in particular to an SCR denitration self-heating anti-blocking ammonia spraying nozzle and equipment, the ammonia spraying nozzle is provided with a double-layer sleeve structure, so that a heating cavity for mounting a heating device is formed between two sleeves; the inner pipe conveys mixed gas of ammonia gas and air, generation and attachment of viscous substances such as ammonium bisulfate are effectively avoided through heating of the heating device in the heating cavity, guide vanes are arranged in a nozzle at the end of the inner pipe, dust, ammonium salt and other substances attached to the position close to the nozzle are thrown away through centrifugal force, and the dust, the ammonium salt and other substances are prevented from being accumulated to block the nozzle; the ultrasonic generator is arranged on the outer pipe, so that ultrasonic waves can be emitted regularly, the inner pipe generates tiny vibration, dust, ammonium salt and other substances attached to the surface of the inner pipe are vibrated off, the self-cleaning function is achieved, the risk that the spray head is blocked is further reduced, and the problem that the ammonia spraying spray head is prone to being blocked is fundamentally solved.

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 provides a flue gas desulfurization and denitrification ultra-low emission DCS control system, belongs to the technical field of flue gas purification, and solves the technical problems that an existing desulfurization and denitrification DCS control system cannot realize deep synergy of desulfurization and denitrification and cannot perform ultra-low emission with accurate prediction and efficient response. The system comprises a boiler, an SCR denitration reactor connected with a flue gas outlet of the boiler, and an air pre-heater fixedly mounted at an outlet of the SCR denitration reactor, wherein an outlet of the air pre-heater is fixedly connected with a dust remover. According to the invention, through the arrangement of the data acquisition assembly and under the action of the collaborative optimization assembly, the system realizes an ammonia escape feedforward-compensation mechanism, the negative coupling between the denitration control unit and the desulfurization control unit is broken, the blockage of ammonium bisulfate is effectively prevented, the reliability of the desulfurization control unit is improved, and the service life of the desulfurization control unit is prolonged. Data acquisition, working condition identification, prediction and energy efficiency optimization are integrated on a unified DCS platform, and closed-loop intelligent control from sensing to decision making to execution is realized.

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.

The invention relates to the technical field of air preheaters and discloses a low-resistance anti-ash-blocking air preheater which comprises a flue gas channel, a primary air channel, a secondary air channel, a heat storage element and an air guide pipe, the flue gas channel is used for high-temperature flue gas to pass through, the primary air channel is used for primary cold air to pass through, and the secondary air channel is used for secondary cold air to pass through. The heat storage element is used for exchanging heat with flue gas in the flue gas channel so that sulfides in the flue gas can be liquefied, the heat storage element communicates with the primary air channel and the secondary air channel, and cold air in the primary air channel and cold air in the secondary air channel can pass through the heat storage element and conduct heat exchange with the heat storage element. One end of the air guide pipe communicates with an outlet of the primary air channel, and an opening in the other end of the air guide pipe faces the heat storage element. According to the low-resistance anti-ash-blocking type air preheater, hot air of the primary air channel serves as a blowing medium, the hot air temperature is high, ammonium bisulfate with high viscosity on the heat storage element can be softened, and the adsorption capacity of the ammonium bisulfate to fly ash is reduced.

The invention discloses an all-vanadium redox flow battery electrode and a modification method thereof, and the modification method comprises the following steps: dipping a carbon-based material in a treating agent aqueous solution, the treating agent being one or more of ammonium sulfate, ammonium bisulfate and ammonium persulfate; and carrying out drying treatment and pyrolysis treatment on the impregnated carbon-based material to obtain the all-vanadium redox flow battery electrode. According to the method, ammonium sulfate, ammonium bisulfate or ammonium persulfate is decomposed into NH3, H2O and SO3, H2SO4 is generated from SO3 and H2O, the surface of the carbon felt is subjected to mild etching, the pore structure of the surface of the carbon felt is increased, the reaction activity specific surface is improved, meanwhile, sulfur and nitrogen atoms are embedded into a carbon skeleton to form a doped structure, sulfur and nitrogen are introduced through the double-doping effect, and the catalytic activity of the oxidation-reduction reaction of vanadium ions (VO2 + / VO2 + and V2 + / V3 +) is enhanced. The modification method provided by the invention is simple and environment-friendly in process, avoids discharge of strong acid waste liquid, does not need a cleaning step, and meets green production requirements.

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.

A kind of marine low-pressure selective catalytic reduction denitration system regeneration method utilizes marine engine supercharger front high-temperature exhaust waste heat, to heat up to ammonium bisulfate decomposition temperature point to SCR system, to realize the regeneration of SCR system.Supercharger front high-temperature exhaust gas is introduced into SCR reactor by exhaust gas bypass valve, and the flow of high-temperature exhaust gas can be changed by adjusting the opening of exhaust gas bypass valve according to the volume of catalyst in SCR reactor and the set regeneration temperature.The invention can save the traditional engine external afterburner, significantly reduce the floor area of SCR system, simplify the operation of SCR system, and realize the full utilization of engine exhaust waste heat utilization.

The application provides a kind of high molecular denitration system ammonia escape control equipment and control method, it is related to the technical field of removing nitrogen oxides in flue gas.The method applies the equipment, the equipment includes: denitration reactor, with the flue gas inlet pipe and the flue gas outlet pipe, the flue gas inlet pipe and the flue gas outlet pipe are sequentially provided with spray grid and reaction zone;Agent pipeline is connected with the spray grid;Adjusting mechanism;Ammonia escape detection mechanism is used to detect the ammonia escape in the flue gas outlet pipe;Control mechanism is used to control the adjusting mechanism according to the detection result of the ammonia escape detection mechanism, to adjust the flow size in the agent pipeline.When ammonia escape detection mechanism detects that the ammonia content in the flue gas outlet pipe is higher than the preset threshold, the flow in the agent pipeline is reduced by controlling the adjusting mechanism through the control mechanism, the ammonia escape is reduced, and the blockage and corrosion of the denitration reactor and downstream equipment caused by the generation of ammonium bisulfate due to water vapor, SO3 and ammonia escape in flue gas are avoided.

The present application relates to a high concentration of ammonium bisulfite preservation solution, the preservation solution components include ammonium bisulfite and ethanol, the concentration of ammonium bisulfite is about 13 mol / L to about 15 mol / L, the concentration of ethanol is about 0.3 mol / L to about 1.5 mol / L. The present application also provides a method and kit for preserving high concentration of ammonium bisulfite solution.

The invention provides an ammonium bisulfate decomposition system in an outlet flue of a thermal power plant SCR reaction device, and relates to the field of ammonium bisulfate decomposition, the ammonium bisulfate decomposition system comprises a flue gas pretreatment module, an ammonium bisulfate decomposition module, an ammonia recycling module and a waste heat integration module; the flue gas pretreatment module comprises an inertia separation unit and a temperature balancing unit; the ammonium bisulfate decomposition module comprises a gradient heating unit, a rotational flow decomposition unit and a phase change separation unit; the ammonia recycling module comprises a catalytic reforming unit and a hydrogen energy recovery unit. Through the arrangement of the ammonium bisulfate decomposition module and the ammonia recycling module, flue gas is accurately heated to the decomposition temperature through the stepped heating unit by adopting a specially designed finned tube heat exchanger; the catalytic reforming unit converts ammonia gas into clean hydrogen fuel for reuse, the ammonia escape rate is controlled to be 1.5 ppm or below, the ammonia nitrogen concentration of wastewater is reduced to 15 mg / L, and through resource utilization, pure pollution control is converted into an energy recovery device.

The invention discloses a method for producing a high-phosphorus-content calcium magnesium phosphate fertilizer by using an industrial byproduct magnesium ammonium phosphate, which comprises the following steps: drying and screening magnesium ammonium phosphate, adding phosphorite, dolomite or serpentine and coke or anthracite, feeding the materials into a smelting furnace according to a ratio, melting and smelting at a high temperature, blowing air or oxygen by an air blower at the smelting temperature of 1400-1600 DEG C for 2-3 hours, and cooling to room temperature to obtain the high-phosphorus-content calcium magnesium phosphate fertilizer. The smelting time is 0.5-4 hours, discharging molten slag from a slag opening of the smelting furnace, and carrying out water quenching to obtain the calcium magnesium phosphate fertilizer; gas generated in the process enters a hot-blast stove along with smelting furnace gas, at the moment, the temperature of a hearth of the hot-blast stove reaches 900-1000 DEG C due to gas combustion, and ammonia reacts with nitrogen oxide in the tail gas to obtain nitrogen and water, and reacts with sulfur dioxide to finally obtain ammonium bisulfate. According to the invention, resource utilization of the industrial byproduct magnesium ammonium phosphate can be realized, the calcium magnesium phosphate fertilizer with high phosphorus content can be obtained, and nitrogen oxides and sulfur dioxide in the tail gas in the production process of the calcium magnesium phosphate fertilizer can be more effectively removed.

A coagulant comprising a metallic salt and an acid carrier having at least one inorganic salt, an acid, and water. The metallic salt can be ferric chloride, ferric sulfate, aluminum sulfate, polyaluminium chloride, aluminum chlorohydrate, or a combination thereof. The acid carrier may comprise a first inorganic salt and a second inorganic salt. The first inorganic salt can be ammonium sulfate, and the second inorganic salt can be ammonium bisulfate. The acid can be phosphoric acid, a hydrogen halide, nitric acid, sulfuric acid, or a combination thereof. Mixing the coagulant with raw water generates a plurality of acid pockets in the raw water, causing reactions between the blended coagulant and the dissolved organic matter.

The application discloses a kind of high-concentration sulfur dioxide flue gas's sulfur trioxide accurate removal and denitration synergic processing method and system, solve the problem of downstream ammonium bisulfate deposition.It includes the following steps: introducing high-concentration sulfur dioxide flue gas from sulfur-containing material processing process, with sulfur dioxide as the main sulfur component and containing sulfur trioxide and nitrogen oxides into the mixed reactor;Detect the flue gas flow and the sulfur trioxide concentration at the inlet and outlet of the mixed reactor;Determine the calcium-based absorbent powder injection amount according to the flue gas flow and the inlet sulfur trioxide concentration, and correct it according to the outlet sulfur trioxide concentration;Spray calcium-based absorbent powder according to the corrected injection amount, so that it reacts with sulfur trioxide to form calcium sulfate first, and is limited to supply relative to the total sulfur dioxide load;After the treated flue gas is intercepted by a high-temperature filter dust collector, it enters the selective catalytic reduction reactor for denitration, and then is sent to the sulfur dioxide acid-making or resource processing process after waste heat recovery.

The utility model discloses a high-dust sulfur-resistant medium-temperature nitrate and dust integrated device, belongs to the technical field of denitration and dust removal of dust-containing sulfur-containing flue gas, and aims to solve the problems that in the prior art, firstly, a low-temperature denitration (160-240 DEG C) catalyst is not sulfur-resistant (the prior art is immature), and the denitration process can be carried out after the concentration of SO2 in the flue gas is reduced to be less than 50mg / m; otherwise, ammonium bisulfate poisoning of the catalyst is caused, and equipment is blocked; due to the requirement of a denitration temperature window, wet desulfurization cannot be matched after desulfurization is preposed, the desulfurization efficiency of dry desulfurization is lower than that of a wet desulfurization, the dry desulfurization is not suitable for a high-sulfur-dioxide working condition, the selection of smelting raw materials and the desulfurization efficiency are limited, and the operation and maintenance cost is relatively high; secondly, the problems of abrasion, dust blockage, thorough dust removal and the like under a high-dust working condition cannot be solved by traditional dust-free catalyst type selection; comprising a raw flue gas box body, lower mounting frames are fixedly arranged on the two sides of the bottom of the raw flue gas box body, ash buckets are assembled below the two lower mounting frames, and middle box bodies are installed on the two sides of the raw flue gas box body.

The invention relates to a preparation method and application of an amorphous low-temperature denitration catalyst resistant to water and ammonium bisulfate poisoning, belongs to the technical field of selective catalytic reduction catalysts, and solves the problem that an existing catalyst is difficult to keep high activity and high stability at the same time in an ultralow-temperature complex atmosphere containing liquid water and ammonium bisulfate deposition. Comprising the following steps: mixing glacial acetic acid, absolute ethyl alcohol 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, and stirring to obtain a second solution; adding manganese, titanium, cerium, niobium and an auxiliary precursor, and stirring to obtain a third solution; adding urea and stirring to obtain a fourth solution; adding a pore-enlarging agent and stirring to obtain a fifth solution; and reacting, washing and drying, reacting again, washing and drying, pre-calcining in an inert atmosphere and calcining in air to obtain the amorphous denitration catalyst. The catalyst shows excellent denitration activity and stability under the condition of containing liquid water and ammonium bisulfate.

The invention discloses a partition sealing and high-temperature environment construction system and method for intelligent and accurate self-ash-cleaning of an air pre-heater, and relates to the technical field of thermal generator set boiler tail flue gas treatment. An annular control area which can be independently and accurately regulated and controlled is established for the air pre-heater, and physical obstacles of partition control are eliminated. A closed micro-positive-pressure high-temperature environment is created, flue gas heat energy is effectively enriched and efficiently utilized, the temperature of a target area is continuously and uniformly increased to a set high temperature, hardened accumulated ash of ammonium bisulfate (ABS) is decomposed, and the surface viscosity of the ABS is not only softened. A stable, controllable and predictable physical execution environment is provided, an ash removal instruction which is sent by an upstream ash deposition diagnosis system and aims at a target logic control ring is accurately responded and executed, and a decision-execution closed loop of predictive intelligent maintenance of the air pre-heater is achieved.

This invention belongs to the field of multi-stimulus responsive luminescent materials technology. It provides an organic fluorescent dye compound with a D-A-D structure, its preparation method, and its applications. The method includes the following steps: S1, in a protective gas atmosphere, a tricyclic compound, a thiophene compound, a palladium catalyst, an alkaline compound solution, and a solvent are mixed and subjected to a Suzuki coupling reaction to obtain an intermediate product; S2, in a protective gas atmosphere, the intermediate product, 2-amino-4,6-dimethylpyrimidine, tetrabutylammonium hydrogen sulfate, an alkaline compound solution, and a solvent are mixed and subjected to a Knauvengel condensation reaction to obtain the organic fluorescent dye compound with a D-A-D structure. The organic fluorescent dye compound provided by this invention allows for the regulation of its luminescent properties by changing the steric hindrance of the power supply system, showing promising application prospects in organic optoelectronic materials, biochemical detection, and cell imaging.

The invention belongs to the technical field of asbestos tailing utilization, and particularly discloses an asbestos tailing full-resource utilization process. The method provided by the invention comprises the following steps: crushing and sieving asbestos tailings, adding a sulfating roasting reagent and ammonium bisulfate to obtain a mixed material, and roasting the mixed material in a fluidized bed; after heat preservation treatment, water is added for a leaching reaction, and leaching residues and filtrate are obtained through solid-liquid separation; adjusting the pH value of the filtrate to obtain a mixed precipitate of ferric hydroxide and nickel hydroxide and a sulfate solution, performing evaporative crystallization on the sulfate solution, and performing roasting treatment to obtain a mixed oxide; and adding aluminum powder into the mixed oxide, and carrying out aluminothermic reduction reaction to obtain the magnesium ingot. According to the method, high-valued utilization of various elements in the asbestos tailings can be achieved, circular economy and closed-loop utilization can also be achieved, and the economic effect of enterprises is improved.

The invention belongs to the technical field of high-sulfur flue gas treatment, and particularly relates to a high-sulfur flue gas denitration and sulfur protection recycling method and application. The recycling method for denitration and sulfur protection of the high-sulfur flue gas comprises the following steps: carrying out denitration treatment on the high-sulfur flue gas and then carrying out acid making treatment; the denitration treatment comprises the following steps: carrying out spontaneous reaction denitration on the high-sulfur flue gas under a spontaneous reaction condition; the spontaneous reaction condition comprises constant temperature and micro pressure; wherein the constant temperature ranges from 180 DEG C to 450 DEG C; and the pressure of the micro pressure is 1.01 atm to 1.5 atm. According to the recycling method for denitration and sulfur protection of the high-sulfur flue gas, external oxidation / reducing agents such as ammonia and ozone are not introduced in the whole process, and the secondary pollution problems such as ammonium bisulfate blockage, ammonia escape and ozone leakage are avoided from the source.

This disclosure provides the use of molecular complexes of polyammonium bisulfate alone and in combination with certain metals or metal salts to treat burn wounds.

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.

The application discloses a method for inducing differentiation of Trichoderma to produce chlamydospores, and relates to the field of agricultural biotechnology. The method comprises the following steps: adding an inducing substance to a culture medium during fermentation culture to induce differentiation of Trichoderma to produce chlamydospores; and the inducing substance comprises at least one of ammonium persulfate, ammonium bisulfate, ammonium chloride or ammonium bromide. By adding the inducing substance at the beginning of fermentation or in the middle of fermentation, the spore type of Trichoderma can be changed from conidium to chlamydospore, so that the proportion of chlamydospores in the Trichoderma biocontrol preparation can be improved. Therefore, the method has important significance for solving the problem of short shelf life of Trichoderma. The method has a significant inducing effect in various culture media and various specifications of bioreactors, the inducing substance is low in price, simple in operation during use, suitable for large-scale production of various scales, and has a wide market prospect.

This invention relates to a method for preparing a nitric oxide absorbent for flue gas from a coal-fired power plant and its application, comprising the following steps: preparing tridentate aldehyde through a multi-step organic synthesis reaction; preparing triangular prism cage-like molecules; preparing a nitric oxide absorbent stock solution; and formulating the nitric oxide absorbent. The beneficial effects of this invention are: employing the principle of physical adsorption, the triangular prism cage-like compound captures NO through physical adsorption, and through desorption, high-purity nitric oxide gas can be obtained and reused for NO molecule absorption. This method is safer than traditional chemical methods, effectively avoiding the environmental hazards caused by ammonia escape and the impact of byproducts such as ammonium bisulfate on the normal operation of the unit, and also features high recycling rate and long service life.

The invention provides an air preheater cold section anti-ash-blocking device and a using method thereof, and belongs to the technical field of coal-fired units. The problem of ash blockage caused by the fact that fly ash is adhered to the cold section of the tubular air preheater of the coal-fired unit in a liquid ammonium bisulfate state is solved. The anti-ash-blocking device comprises a cold-section air preheater, a connecting flue and a flue gas distribution header, the cold-section air preheater is partitioned in the width direction of a flue gas channel, a plurality of independent flue gas partitions are formed in the cold-section air preheater, one end of the connecting flue is connected with an outlet flue of the economizer, and the other end of the connecting flue is connected with an outlet flue of the economizer. The other end of the connecting flue is connected with a flue gas distribution header, and the flue gas distribution header is respectively connected with each independent flue gas subarea. The device is mainly used for coal-fired units.

This invention belongs to the field of energy storage technology and discloses a cascaded ammonium bisulfate thermochemical energy storage system and a method for energy storage and heat release. The system includes a heat source, a heat storage unit, and a heat release unit. The heat storage unit absorbs heat from the heat source to decompose ammonium bisulfate in multiple steps. The decomposition products are stored and transported to the heat release unit, where ammonium bisulfate is resynthesized and heat is released in multiple steps for utilization. This invention proposes a cascaded ammonium bisulfate thermochemical energy storage system, which demonstrates excellent performance and potential in the field of energy storage and utilization. The system can operate according to a precisely controlled multi-step process, including efficient heat absorption, precise decomposition of energy storage chemicals, stable separation and storage of reaction products, and subsequent multi-step heat release and resynthesis of energy storage chemicals.

The application discloses a kind of SCR denitration ammonia injection grid cold-state debugging methods, comprising the following steps: in the entrance flue of SCR denitration device arrangement ammonia injection branch pipe array, each ammonia injection branch pipe is equipped with a regulating valve, each regulating valve downstream is equipped with throttle orifice plate differential pressure measuring device;Calculate the flow velocity distribution of ammonia injection grid upstream section, the proportion of each area flue gas flow in total flow is counted;In the unit shutdown state, the corresponding flow characteristic curve of each regulating valve is calculated;The theoretical orifice plate differential pressure value of different area regulating valve is calculated;The initial opening of each regulating valve is calculated.The SCR denitration ammonia injection grid cold-state debugging method provided by the application is to optimize and adjust the opening of the regulating valve of ammonia injection grid in the unit shutdown state, which can improve the uniformity of NOx concentration distribution at the outlet of SCR denitration device after the unit starts, reduce the local ammonia escape concentration and reduce the risk of ammonium bisulfate plugging of denitration downstream equipment.

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 discloses a soot blowing method to improve air preheater blockage, comprising the following steps: First, determine the soot blowing steam source parameter point A on the steam enthalpy-entropy diagram; reduce the steam temperature by 5-15°C along the isobaric line to point B as a process design margin; draw a pressure-reducing isoenthalpy process line through point B; determine the soot blowing steam temperature required to decompose ammonium bisulfate; find the soot blowing steam temperature point D at the flue gas pressure that can decompose ammonium bisulfate on the steam enthalpy-entropy diagram, and draw a spray line through point D; the intersection point C of the isoenthalpy process line and the spray line is the spray point; determine the corresponding size of the soot blowing nozzle based on the pressure at point C and the required soot blowing radius; after setting the parameters of the soot blower, complete the soot blowing operation. This invention ensures that the air preheater steam used for soot blowing is high-temperature dry steam capable of decomposing ammonium bisulfate, effectively removing ash that is severely caked at the cold end of the air preheater due to sulfuric acid and ammonium bisulfate, thus contributing to the stable operation of the unit.