177results about How to "Reduce escape rate" patented technology

The invention relates to a foam-like low-temperature SCR catalyst and a preparation method thereof. The catalyst is composed of a framework carrier and an active coating carried by the framework carrier. Foam ceramic of a 3D porous structure serves as the framework carrier. The active coating is composed of active components, auxiliaries and base materials. The inner portion of the foam-like low-temperature SCR catalyst is of a staggered 3D porous structure, smoke moves in ducts in a curve mode, the mixing effect of smoke and reducing agents is optimized, the utilization rate of reducing agents is increased, and ammonia escape is reduced. The catalyst has excellent low-temperature activity for NOx reduction, the removal efficiency for NOx under the condition that the smoke temperature is 170-180 DEG C is kept at 90% or above, and the catalyst has high thermal stability and sulfur-resistant capacity.

The invention relates to a craftwork for producing the industrial-level monoammonium phosphate consecutively with the phosphoric acid by wet process, which adopts the following steps: 1) phosphoric acid and phosphorite pulp are desulfurized to get the desulfurized phosphoric acid; 2) the acid is undertaken the first neutralization action to get a neutralized material pulp clarifying solution; 3) after the second neutralization reaction, the solution is reacted with the desulfrized phosphoric acid to get a secondary neutralized material pulp with the pH value being adjusted; 4) the secondary neutralized material pulp with the pH value being adjusted is primarily filtered to get a primary filtering solution and a primary filtering mass; 5) the primary filtering solution is secondarily concentrated and press filtered to get the secondary filtering solution; 6) the obtained secondary filtering solution is dissolved through the grain refining, is cooled down in vacuum, is crystallized, is centrifugally separated and dried to get the finished product of the industrial-level monoammonium phosphate. The invention has the advantages that the operation during the production process is consecutive; the labor intensity of the worker is reduced; the leakage rate of the ammonia is low and the loss is small; the secondary neutralized raw material solution is clear solution, so that the viscosity is low and the loss of the ammonia is small; the neutralization and the press filtering load is reduced; the crystallization production capacity is large; the heat energy is adequately used, thereby reducing the consumption of the vapor.

The invention discloses a preparation method of a high-strength and antioxidant rare-earth-based smoke denitration catalyst. The preparation method of the high-strength and antioxidant rare-earth-based smoke denitration catalyst comprises the following steps: by taking titanium dioxide and montmorillonite as carriers and ammonium metatungstate, cerous nitrate and lanthanum nitrate as active components, mixing, ageing, kneading, forming, drying and roasting with the accompanying of auxiliary materials. The auxiliary materials comprise ammonia water, lactic acid, citric acid, stearic acid, glass fiber, wood pulp, hydroxypropyl methyl cellulose, polyoxyethylene, monoethanolamine and water. The product prepared by the method is separated under a high SO2 smoke condition, nitric oxide in the smoke can be decomposed; meanwhile, the purpose of removing mercury and dioxin can be achieved. According to the preparation method of the high-strength and antioxidant rare-earth-based smoke denitration catalyst, the rare earth elements, namely cerium and lanthanum are used as the active components, so that the addition amount of vanadium is reduced, the toxicity of the product is reduced or the product is non-toxic product, the pressure of the post treatment of the product is reduced; the environmental protection pressure is reduced; the product is environmentally friendly; the product can be widely used in the field of thermal power plants, glass factories and chemical plants.

The invention discloses a double-rotation SCR denitration method and an apparatus thereof. According to the invention, a first eddy flow catalytic reaction chamber and a second eddy flow catalytic reaction chamber are arranged along a denitrating tower body; a flue gas introduction pipeline is arranged on a sidewall of the denitrating tower body; several eddy flow atomizing nozzles are respectively arranged on inner periphery of the flue gas introduction pipeline and the inner periphery at top of the first eddy flow catalytic reaction chamber; when flue gas is introduced into the flue gas introduction pipeline, the flue gas and ammonia gas injected by the eddy flow atomizing nozzle are mixed, and a mixture enables spiral sinking along circumference of the first eddy flow catalytic reaction chamber from up to down in a tangent circle mode, under effect of a cyclone, and then the mixture enable spiral rise along circumference of the second eddy flow catalytic reaction chamber from down to up in the tangent circle mode. Under prerequisite that high efficiency denitration is ensured, catalyst amount is less, operation of technical means is simple and easy, compared with the prior art, a denitrating tower structure is simple, cost of the apparatus is low, denitration efficiency is high, energy consumption is low, escapement ratio of ammonia is reduced, denitration cost is greatly reduced, and economic benefit is obviously increased.

The invention discloses a dedusting-denitrating integrated device which comprises a flue gas channel, a mixed flue gas inlet and a shell consisting of an outer cylinder and an inner cylinder, and a ash hopper at the bottom of the shell, wherein the inner cylinder is mainly used for dedusting and ammonia mixing, the outer cylinder is mainly used for containing a denitrating catalyst bed, the crosssection of the flue gas channel is ring-shaped, and ammonia spray grilles are distributed in the flue gas channel in a radial manner so that the required NH3-to-NO ratio can be reached more easily. The device provided by the invention can be used for dedusting before carrying out denitrating, a catalyst can be effectively prevented from being worn, poisoned and blocked and the service life of thecatalyst can be prolonged. Under the condition that the length of the device is not increased, the ammonia mixing time is prolonged and ammonia mixing can be performed fully; heat absorbing spiral plates and cooling rectifier plates are arranged in both the inner cylinder and the outer cylinder to share heat of flue gas at the inlet, and therefore the heat loss of flue gas can be reduced, the denitrating efficiency can be improved and the catalyst is prevented from being sintered and inactivated under the action of superheated flue gas.

The invention relates to the technical field of selective catalytic reduction denitrification of industrial flue gas, in particular to a zoning-regulating double-layer ammonia injection grid applied to a selective catalytic reduction denitrification device for industrial flue gas. In order to solve the problems that the ammonia distribution on a flue section of the conventional ammonia injection grid is quite non-uniform, which affects the denitrifying efficiency and increases the escape rate of ammonia, and the like, the zoning-regulating double-layer ammonia injection grid applied to the selective catalytic reduction denitrification device for the industrial flue gas divides the flue section into two equal subzones; the ammonia injection function of one subzone (1/2 of the flue section area) is realized by an upper ammonia injection grid and the ammonia injection function of the other subzone is realized by a lower ammonia injection grid; and according to the distribution rules of the flow rates of the flue gas in the two flue section subzones and different concentrations of NOx in the flue gas, the ammonia injection amount of each subzone is regulated and controlled by an ammonia injection regulating valve, so that the ammonia injection amount is adjustable on different zones of the flue section, the uniform mixing effect of the ammonia and nitrogen oxides in the flue gas is optimized, the denitrifying efficiency is improved, and the escape rate of the ammonia is effectively reduced. The uniform zoning-regulating double-layer ammonia injection grid applied to a selective catalytic reduction denitrification device for industrial flue gas has a good uniform mixing effect of the nitrogen oxides in the flue gas and the ammonia, improves the denitrifying efficiency, effectively reduces the escape rate of the ammonia, and is applicable to NOx selective catalytic reduction denitrification devices in coal burning, metallurgy, chemical industry and other industries.

The invention discloses a sintering and pelletizing flue gas SCR denitration and dioxin removal apparatus. The apparatus mainly comprises a heat exchange device for the primary heating of a flue gas for processing, a secondary heating device, a reaction device for the SCR denitration and dioxin removal of the flue gas, and an ammonia-air supply device arranged between the heat exchange device and the SCR reaction device, wherein a smoke outlet of the SCR reaction device is connected with a thermal medium inlet of the heat exchange device. The apparatus has the advantages of high efficiency, low ammonia escape rate, effective mitigation of poisoning caused by the wearing and obstruction of a catalyst by dusts in the flue gas, effective solving of a technical bottleneck that effective nitrogen removal cannot be realized because of the too low temperature of the sintering and pelletizing flue gas out of a normal work temperature range of a denitration catalyst, recovery of flue gas discharging heat, running cost reduction, and furthest reduction of the nitrogen removal cost.

The invention provides a coke oven flue waste gas desulfurization and denitrification and waste heat recovery integrated process. Coke oven flue waste gas is subjected to an SCR reaction under the effect of a low-temperature SCR denitrification catalyst to remove nitric oxides in flue waste gas, a sodium-based dry powder absorbent is sprayed to flue waste gas for desulfurization after waste heat is recovered through a waste heat boiler, and desulfurized flue waste gas is discharged up to standard after dust removal is conducted through a filter. The process is free of waste water, waste gas emission and heating, denitrification can be directly conducted, the absorbent can be recycled, investment is reduced, and energy is saved.

The invention discloses a desulfurization system comprising a tower body, wherein a smoke inlet is arranged in the middle of the tower body; a pure smoke outlet is arranged at the top of the tower body; a slurry pool for containing slurry is formed on the lower part of the tower body; the slurry pool is provided with a mixed liquid outlet; a slurry spraying layer, a rising air gap and a clean water spraying layer are sequentially arranged from the smoke inlet to the pure smoke outlet from bottom to top; the bottom of the slurry pool is respectively connected with an oxidization mechanism and an ammonia supplying mechanism; and the desulfurization system further comprises a slurry circulating mechanism and a clean water circulating mechanism. The invention further provides a desulfurization process; and the process is low in water consumption amount so that the amount of saturated steam in pure smoke is reduced by 30-40% and consumption of external clean water is reduced. According to the desulfurization system and the desulfurization process disclosed by the invention, the operation cost is low; and the consumption of the steam is 20% of that of an ammonia-fertilizer method process and the consumption of power is 40% of that of the ammonia-fertilizer method process. The escaping rate of ammonia is low; the content of the ammonia in the pure smoke is less than 8mg/Nm<3>; no three wastes are discharged; and secondary pollution to an environment is not caused.

The invention relates to a denitration and dedusting difunctional ceramic filter, and a preparation method and an application thereof. The preparation method of the denitration and dedusting difunctional ceramic filter includes the following steps: (1) with a titanium salt solution as a precursor, growing a TiO2 ultra-thin film in ceramic filter pores in situ by a precipitation method; and (2) loading the TiO2 ultra-thin film obtained in the step (1) with vanadium and tungsten, and thus obtaining the denitration and dedusting difunctional ceramic filter. The SCR denitration catalyst ultra-thin film is precipitated and grown in situ in the ceramic filter pores, is uniformly dispersed in nanometer scale, has adjustable thickness, and is firmly combined with a ceramic filter substrate; the prepared catalytic ceramic filter enables the NOx conversion rate to reach 80% of the limiting conversion rate and the ammonia escape rate to be less than 5 ppm with the NH3/NOx ratio of 0.8 and in a wide temperature range of 180-420 DEG C; and at the same time, under the same pressure drop condition with an original filter, the catalytic ceramic filter can have the dust removal efficiency reaching more than or equal to 99%.

The invention discloses a flue gas ammonia desulfurization and deslagging system. The flue gas ammonia desulphurization and deslagging system comprises a flue gas desulfurization sub-system, an ammonium sulfate separation sub-system and an ammonium sulfate deslagging sub-system; the flue gas desulfurization sub-system comprises an absorption tower and a flue gas pre-dedusting cooling device arranged at the position of a flue gas inlet of the absorption tower; the ammonium sulfate separation sub-system comprises a primary cyclone, a secondary cyclone, a dehydration centrifugal machine and a fluidized drying bed which are sequentially connected with one another; the ammonium sulfate deslagging sub-system comprises a filtrate tank, a mixing dosing tank and a filter press which are sequentially connected with one another; and a slurry outlet of the absorption tower is connected with the primary cyclone, a purified liquor outlet of the primary cyclone, a purified liquor outlet of the secondary cyclone and a liquid outlet of the dehydration centrifugal machine are connected with the filtrate tank, and accordingly, the three sub-systems are connected into a whole. By means of the flue gas ammonia desulfurization and deslagging system, ammonia escape amount can be reduced, the phenomenon of acid rain can be effectively relieved, utilization ratios of absorbents are increased, recovery rates of ammonium sulfate products are increased, qualities of the ammonium sulfate products are improved, occupied space areas are small, space is saved, and the system can be generally used in ammonia flue gas desulfurization of thermal power generation and sintering flue gases.

The invention discloses an ion source capable of reducing an electron escape rate, including an anode ring, inner cathode and outer cathode, the anode ring, the inner cathode and the outer cathode areeach axisymmetric, a soft magnetic column is fixed in the middle of the yoke of the outer cathode, one end of the soft magnetic column passes through the center of the inn hole of the anode ring andis connected with the middle of the inner cathode, the longitudinal cross-sectional shape of the magnetic pole shoe of the inner cathode is mirror symmetrical with the longitudinal cross-sectional shape of the magnetic pole shoe of the outer cathode of the corresponding position, and an annular cathode gap is formed between the magnetic pole shoe of the inner cathode and the magnetic pole shoe ofthe outer cathode, the anode ring is directly opposite to the lower part of the cathode gap, two permanent magnets are arranged on the magnetic yoke of the outer cathode, the two permanent magnets aresymmetrical with respect to the soft magnetic column, and the two permanent magnets are respectively positioned directly below the opposite sides of the anode ring. By increasing the symmetrical magnetic field, the invention improves the uniformity of the magnetic field distribution on both sides of the cathode gap, can reduce the escape rate of electrons and effectively reduce the bombardment probability of the electrons on the cathode magnetic pole shoe.

The invention disclose a total absorption superlaser energy meter which comprises a reflection cone and an absorption cavity, wherein the generatrix of the reflection cone is arc-shaped, the absorption cavity is formed by sealed connection of a base plate, an inner lateral plate, an absorption cylinder and a cover plate, the whole structure of the absorption cavity is concave, the wall of the absorption cylinder is arranged on the light path of a superlaser beam after the superlaser beam is reflected through the reflection cone, and the absorption cylinder is located behind the reflection cone in the front and back direction. According to the total absorption superlaser energy meter, the incident collimated light beam is reflected onto the wall of the absorption cylinder in an axial and circumferential two-dimensional beam expansion mode, the power density of laser irradiating on the wall of the absorption cylinder is reduced greatly, the light receiving area of the reflection cone is increased at the same time, and the laser irradiation bearing capacity of the reflection cone is improved; furthermore, due to the adoption of the cavity structure, the probability that the reflection cone is polluted by dust is effectively reduced, and meanwhile, the exit escape rate of laser is reduced and measurement accuracy of the energy meter is improved.

The invention belongs to the technical field of aquaculture, and in particular relates to a combined netting gear for culturing river crabs in purse seine in a lake, which is combined by a purse net, galion meshes and other netting gears to prevent river crabs from escaping. An outer purse net and an inner purse net are both fixed on a mao bamboo pile; the bottom of the inner purse net, a main galion mesh and an auxiliary galion mesh are fixed together and sunk into mud; the upper end of the inner purse net is provided with a gamma-shaped reverse covering net (an escape preventing net); the bottom of the outer purse net is inserted into substrate sludge by a ground anchor for fixing; cage meshes are arranged at the water bottom in the middle of the inner purse net and the outer purse net. The combined netting gear has the advantages that the escape of the river crabs can be effective prevented by using two layers of purse nets; the upper end of the inner purse net is provided with the reverse covering net, so that even if the river crabs can creep up to the upper end of the inner purse net and finally reach the reverse covering net, the river crabs can also drop into a purse seine region; the arrangement of the main galion mesh and the auxiliary galion mesh ensures that meshes cannot drift under the condition that the purse nets encounters heavy storm.

The invention discloses a double-atomization spray gun for an SNCR (selective non-catalytic reduction) denitration system. The double-atomization spray gun comprises a reducer solution pipeline, a mechanical conical spraying nozzle, a compressed air sleeve, a fan-shaped air atomization nozzle, a protection sleeve and quick-connecting flanges, wherein the spray gun adopts a method of combining direct reducer solution atomization and secondary compressed air atomization, so that the atomization effect is relatively good; a compressed air flow and a reducer flow are independently adjustable and low in correlation, so that the control is relatively convenient and simple. The spray gun disclosed by the invention is connected with the sleeves by the quick-connecting flanges, the nozzle is connected with the spray gun by a thread, so that the connection and the replacement are convenient. The double-atomization spray gun is convenient to manufacture, low in cost, wide in application range, easy to popularize and implement, and good in economic benefits.

The invention provides an integrated system for coke oven flue gas desulfurization and denitrification and waste heat recovery. The integrated system comprises a coke oven, a low-temperature SCR denitrification system, a waste heat boiler, a flue, a pulverizer, a filtering system and a chimney. The coke oven, the low-temperature SCR denitrification system, the waste heat boiler, the filtering system and the chimney are sequentially connected through the flue, a dry powder absorbent inlet is formed in the portion, between the waste heat boiler and the filtering system, of the flue and is connected with an outlet of the pulverizer through a pipeline, and an absorbent inlet is formed in the pulverizer. The system is free from waste water and gas emission and capable of directly carrying out denitrification without heating, absorbent can be used circularly, investment can be reduced, and energy can be saved.

The method of lowering the escapement rate of ammonia in the outlet of fume denitrator is to perform secondary treatment of denitrated fume before it enters to the air preheater. One molecular sieve reactor is set before the air preheater to eliminate unreacted ammonia completely or partially to lower the escapement rate of ammonia. The molecular sieve reactor is filled with elite, active carbon or artificially synthesized molecular sieve, and the molecular sieve has homogeneous pore size in 2.8-3.8 angstrom. The apparatus of the present invention can well control the escapement rate of ammonia, reduce the influence on the downstream apparatus, avoid secondary pollution, simplify the ammonia spaying set and its control system, and lower investment cost and running cost.

The invention relates to a multilayer planetary roller mill, which belongs to the field of powder grinding processing equipment. In the multilayer planetary roller mill, a grinding cylinder is fixedly connected with a hollow rotating shaft, a grinder roll bracket is a multilayer connecting bracket which is axially arranged at intervals, each layer of connecting bracket is movably connected with grinder rolls through connecting chains which are uniformly arranged in the radial direction at intervals, a central rotating shaft passes through a central axis of the grinder roll bracket to be fixedly connected with the grinder roll bracket, the central rotating shaft is sleeved inside the hollow rotating shaft to be integrally arranged inside the grinding cylinder, the central lines of the two rotating shafts are overlapped, the central rotating shaft and the hollow rotating shaft are respectively connected with a power device and rotate in reverse directions, and the grinder rolls rotate in opposite directions with the grinding cylinder inside the grinding cylinder. On one hand, the grinder rolls are driven by the grinder roll bracket and affected by the friction force with the grinding cylinder to obtain a higher speed than that of the grinding cylinder, and on the other hand, multilayer and multi-angle grinding working surfaces which are formed through the grinder rolls which are movably connected with the multilayer connecting bracket, the grinding working efficiency of the materials can be adequately improved and the escaping rate of the materials can be reduced.