152 results about "Ammonium bisulfate" patented technology

The invention provides a method for simultaneously detecting perfluorinated compounds in mouse tissues and organs, and belongs to the technical field of analysis and detection. The method provided by the invention comprises the following steps: mixing a mouse visceral organ tissue sample, an alkaline buffer solution and an internal standard solution, and homogenizing to obtain homogenate; mixing the homogenate with tetrabutylammonium hydrogen sulfate and methyl tert-butyl ether, and carrying out liquid-liquid extraction to obtain extract liquor; and sequentially drying and redissolving the extract liquor, and carrying out ultra-high performance liquid chromatography-tandem mass spectrometry analysis to obtain a result of the perfluorinated compound in the mouse tissue visceral organs. The result of the embodiment shows that the adding standard recovery rate of 14 target objects in the method provided by the invention is 64.9%-120.3%, the RSD of 6 repeated tests is 1.0%-14.0%, the matrix effect of the target objects is 83.7%-134.0%, and the matrix effect is relatively low; and the detection result has excellent accuracy and reproducibility.

The invention discloses a micron-sheet rare-earth-based denitration and chlorobenzene removal catalyst as well as a preparation method and application thereof. The catalyst takes micron-sheet reduced graphene oxide as a carrier, a composite oxide of cerium oxide and vanadium oxide as an active component and a hexahydrotriazinyl covalent organic framework as an active site protective agent; on the basis of the mass of the carrier, the mass percentage of the active component is 5-10%, and the mass percentage of the active site protective agent is 1-5%. The catalyst synthesized by the method has the advantages of high specific surface area, difficult deposition of ammonium bisulfate, long service life, stable activity and the like, and can realize the target of low-temperature denitration and chlorobenzene removal in the non-electric industry.

A process for stabilizing nutrients in anaerobic digestate involves removing hydrogen sulfide and ammonia from biogas. This process involves circulating the digestate in a column and contacting it with the biogas. Additional ammonium bisulfite, ammonia, and / or sulfur dioxide may be added to the contacting device to remove hydrogen sulfide from the biogas. The reactions will create ammonium bisulfite, ammonium sulfite, and ammonium thiosulfate to prevent ammonia and hydrogen sulfide emissions to allow for land application.

The invention discloses a flue gas distributed denitration process, and belongs to the technical field of fuel gas distributed energy supply. Ammonia gas is added into flue gas at an inlet of a bag-type dust collector and reacts with nitrogen oxide in the flue gas at an active site of a low-temperature denitration catalyst, so that efficient denitration can be realized at a low temperature, and nontoxic and harmless nitrogen and water are generated; reheating denitration is not needed; according to the low-temperature denitration catalyst, cerium nitrate and manganese nitrate are impregnated into mesoporous pores of mesoporous titanium dioxide submicrospheres through vacuum impregnation, glucose serves as a carbon source, p-phenylenediamine serves as a nitrogen source, and manganese cerium / nitrogen-doped titanium dioxide microspheres are obtained through hydrothermal carbonization. And then MOF-tungsten is dispersed in silicon dioxide sol to coat the manganese cerium / nitrogen-doped titanium dioxide microspheres, so that the manganese cerium / nitrogen-doped titanium dioxide microspheres have good compressive strength, wear resistance and denitration efficiency, have excellent ammonium bisulfate decomposition capability and are not easy to block.

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 belongs to the field of plasma detection, and particularly relates to a method for detecting perfluoro and polyfluoroalkyl compounds in plasma. Comprising the following steps: extracting target perfluoro and polyfluoroalkyl compounds in plasma by adopting an ion pair extraction method: mixing the plasma with a buffer solution, adding a tetrabutylammonium hydrogen sulfate solution, uniformly mixing, adding an isotope labeling mixed solution as an internal standard, then adding methyl tert-butyl ether, centrifugally sucking supernate after vortex oscillation, repeatedly extracting, and collecting the target perfluoro and polyfluoroalkyl compounds in the plasma. Combining the supernate, blow-drying, and redissolving with a methanol solution to obtain a to-be-detected sample; detecting a to-be-detected sample through a liquid chromatography-quadrupole time-of-flight high-resolution mass spectrometry method; and analyzing the data to obtain the types and concentrations of the target perfluorinated and polyfluoroalkyl compounds. The method has the advantages of simplicity and convenience in sample treatment, short detection time, high resolution, high sensitivity and the like, and the concentration of trace PFASs in plasma can be efficiently, accurately and quantitatively analyzed.

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 discloses a combined air preheater, wherein a hot flue gas inlet duct is connected with a cold flue gas outlet duct via a flue gas side rotary air preheater, a medium-temperature flue gas outlet duct, a medium-temperature flue gas inlet duct and a heat release side of a tubular air preheater system; a cold air inlet duct is connected with a hot air outlet duct via a heat absorption side of the tubular air preheater system, a medium-temperature air outlet duct, a medium-temperature air inlet duct and an air side rotary air preheater. The preheater can effectively increase the exhaust gas temperature at the rotary air preheater outlet, solve the problem of the influence of ammonium bisulfate ash blocking on the rotary air preheater, and has high safety and stability.

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 anti-blocking treatment system and method for an air preheater. The anti-blocking treatment system comprises an air taking induced draft fan, a first main flue gas pipeline, a second main flue gas pipeline, a flue gas discharging pipeline, a bypass discharging pipeline, a high-temperature air taking pipeline, a flue gas circulating pipeline, a first cold air adjusting pipeline, a second cold air adjusting pipeline, control valves installed on all the pipelines and the like. The boiler hot secondary air recirculation, the flue gas bypass and the induced draft fan are cooperatively adjusted, switching operation of the air preheater between a normal operation state and an off-line cleaning state is rapidly achieved by adjusting and controlling the opening and closing conditions of all valves according to the pressure difference of an inlet and an outlet of the air preheater, and normal operation of the system is not affected; in the off-line cleaning state, the operating temperature of the whole air preheater is increased, ammonium bisulfate attached to the surface of the air preheater is subjected to high-temperature decomposition, the development trend of ammonium bisulfate blockage can be effectively restrained and controlled, and therefore it is guaranteed that unit equipment stably operates for a long time.

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.

Provided is a method for producing a boron-magnesium-containing compound fertilizer. In the disclosure, a boron mud is dissolved in an ammonium sulfate solution to obtain a boron-magnesium-containing solution and ammonia gas; the boron-magnesium-containing solution is crystallized by baking to remove water to obtain a boron-magnesium-containing powder; and the ammonia gas is absorbed with sulfuric acid to obtain an ammonium bisulfate absorption solution; the boron-magnesium-containing powder, the ammonium bisulfate absorption solution, and a first raw material are mixed to obtain a boron-magnesium-containing acid-ammonia slurry; and the boron-magnesium-containing acid-ammonia slurry, a second raw material, and a binder are subjected to granulation to obtain the boron-magnesium-containing compound fertilizer.

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 invention discloses a low-heating-value gas boiler heat exchange system which comprises a horizontal flue and a vertical flue, a high-temperature reheater and a low-temperature reheater are arranged in the horizontal flue, and 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 arranged on the left side and the right side of the middle position of the upper-stage air pre-heater and the lower-stage air pre-heater, a bypass flue is connected between the left side connecting flue and the right side connecting flue and provided with a steam flue gas heat exchanger, and the bypass flue is connected with the two ends of the flue gas heat exchange side of the steam flue gas heat exchanger. The two ends of the steam heat exchange side of the steam flue gas heat exchanger communicate with a steam bypass, and the steam bypass communicates with an outlet of the low-temperature reheater and an inlet of the high-temperature reheater. The smoke temperature of the lower-stage air pre-heater is increased, the condensation possibility of ammonium hydrogen sulfate is reduced, the corrosion risk of the ammonium hydrogen sulfate to the heating surface of the lower-stage air pre-heater is reduced, and the service life of equipment is remarkably prolonged; and the overtemperature risk of the reheater is reduced, and the flexibility of reheating steam temperature adjustment is improved.

The utility model discloses a high-salinity wastewater electrochemical recycling synergistic coal-fired flue gas sulfur oxide removal system which comprises a bipolar membrane electrodialysis device, an air compressor, a spray gun and an SCR (Selective Catalytic Reduction) denitration device, the first spray gun sprays alkali mist formed by mixing and atomizing the alkali liquor and compressed air prepared by the air compressor into flues at the front end and the rear end of the SCR denitration device, and the alkali mist reacts with flue gas in the flues. High-salinity wastewater of the coal-fired power plant is electrolyzed through the bipolar membrane electrodialysis device, and product alkali liquor and compressed air are mixed, atomized and sprayed into flues at the front end and the rear end of the SCR denitration device. The alkaline liquor reacts with SO2 and SO3 in the flue gas, the content of sulfur oxides in the flue gas is reduced, damage, blockage and corrosion of ammonium bisulfate to related equipment are reduced, meanwhile, the acid liquor generated through electrolysis can also be used as a softening agent of a water treatment system in a plant, and the operation cost is reduced.

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 present invention discloses a method for preventing blockage of an air preheater. Step S100: Obtain the differential pressure before and after the flue gas side of the air preheater; Step S200: When the differential pressure is greater than a first preset value and lasts for at least a first preset time, control the unit to perform soot blowing with a low-frequency and high-intensity acoustic soot blower. After the unit performs soot blowing with the low-frequency and high-intensity acoustic soot blower for a first preset number of times, detect the differential pressure. If the differential pressure is greater than a second preset value and lasts for at least a second preset time, it is determined that the air preheater has blockage substances mainly composed of ammonium bisulfate, and a pyrolysis operation is performed, wherein the second preset value is greater than the first preset value. The present invention can reduce the frequency of pyrolyzing ammonium bisulfate, improve the service life of each component of the unit and the stability of the unit operation, and provide maintenance suggestions for the frequent accumulation of ammonium bisulfate.

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.

The present invention proposes a flue gas dust removal and denitrification system and filter bag manufacturing method for medium- and low-temperature sulfur- and water-containing environments. The system includes a flue gas pretreatment device, an ammonia supply unit, a dust removal and denitrification reactor, and a purified flue gas emission device. The dust removal and denitrification reactor includes denitrification filter bags made of high-specific surface area and high-purity titanium dioxide. It uses a high-efficiency oxidant to selectively adjust the gases in the flue gas in advance to achieve the material ratio required for a rapid SCR reaction, significantly increasing the denitrification reaction rate. Titanium dioxide also has a high specific surface area, providing a high specific surface area for contact and adsorption of ammonia and nitrogen oxides, and is not highly oxidizing, significantly reducing the formation of ammonium bisulfate under low-temperature conditions and effectively increasing the service life of the filter bags. By utilizing a rapid SCR reaction mechanism and combining denitrification filter bags made of titanium dioxide, the system improves the filter bags' resistance to water and sulfur under low-temperature conditions, providing a method for dust removal and efficient denitrification of flue gas under medium- and low-temperature conditions containing water and sulfur.

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 invention relates to the technical field of biological detection, in particular to a methylation detection reagent and a urinary tract epithelial cancer detection kit containing the methylation detection reagent. The conversion liquid comprises water, ammonium hydrogen sulfite and sodium hydrogen sulfite, the concentration of the ammonium hydrogen sulfite is 30wt%-90wt%, and the weight ratio of the ammonium hydrogen sulfite to the sodium hydrogen sulfite is (1-50): 1. In the methylation detection process, complete transformation can be realized in a short time by adopting the transformation liquid provided by the invention.

The utility model discloses a coal-fired boiler tail ammonium bisulfate blockage treatment system which is characterized in that a flue gas inlet of a flue gas cooler is connected with a flue gas outlet of a final-stage air pre-heater through a flue gas pipeline, and a flue gas outlet of the flue gas cooler is connected with a flue gas inlet of a dust remover through a flue gas pipeline; an air outlet of the air heater is connected with an air inlet of the last-stage air pre-heater through a first air pipeline, an air outlet of the last-stage air pre-heater is connected with an air inlet of the upper-stage air pre-heater through a second air pipeline, an air bypass pipeline is branched from the first air pipeline and connected with the air inlet of the upper-stage air pre-heater, and a valve is arranged on the air bypass pipeline. A water path outlet of the air heater is connected with a water path inlet of the smoke cooler through a first water path pipeline, and a water path outlet of the smoke cooler is connected with a water path inlet of the air heater through a second water path pipeline to form a heat exchange circulating water path. The utility model solves the problem that ammonia escapes and reacts with SO3 in flue gas and water to generate ammonium bisulfate, and the ammonium bisulfate is condensed on the tail heat exchange surface to cause blockage.

The utility model discloses a heat exchange assembly of an air pre-heater, which belongs to the technical field of heat exchange of air pre-heaters and comprises an outer frame, partition plates and heat exchange sheets, the outer frame is a three-dimensional frame, the partition plates are arranged on the side wall of the outer frame, a plurality of heat exchange sheets are stacked in the outer frame, and each heat exchange sheet is a large-channel corrugated plate. The rotary air pre-heater has the advantages that the heat exchange assemblies are arranged at the cold end of the rotary air pre-heater in a combined mode, along with operation of the air pre-heater, under the action of the corrugated plate heat exchange pieces with the large channels, the flue gas circulation cross section is large, the wave form is smooth, impurities such as ammonium bisulfate, dust and coal cinder are not prone to being attached and easy to remove in the operation process of the heat exchanger, and the heat exchange efficiency is improved. And the heat exchange surface is not easy to block, the pressure loss cannot rise after long-term operation, the energy consumption is effectively reduced, and the practicability of the heat exchange assembly is greatly improved.

The utility model provides an ash removal device for an air pre-heater, which comprises the air pre-heater, an air outlet of the air pre-heater is communicated with an air inlet of a boiler through a first pipeline, a smoke inlet of the air pre-heater is communicated with a smoke outlet of the boiler through a smoke inlet pipe, and a smoke outlet of the air pre-heater is communicated with a smoke outlet pipe; the ash removal assembly comprises two annular pipes arranged close to the two ends of the air pre-heater respectively and a plurality of horizontal pipes communicated between the two annular pipes; each annular pipe and each horizontal pipe are communicated with the air pre-heater through a plurality of connecting pipes, the first pipeline is communicated with one annular pipe through a second pipeline, and a temperature sensor and an electric heating wire electrically connected with the temperature sensor are arranged on the second pipeline. According to the method, the situation that the air pre-heater is blocked due to the fact that the liquid ammonium bisulfate adheres to fly ash particles in the smoke to form viscous accumulated ash on the heating surface of the air pre-heater is avoided as much as possible, and therefore the ash removal efficiency is improved, and the operation economical efficiency of the generator set is ensured.