1034results about How to "Reduce escape" patented technology

The invention provides a food preparation vessel (100) comprising a main inlet (10) for introduction of a food material into the food preparation vessel (100), wherein the food preparation vessel (100) comprises a gas flow generator outlet (21) and a gas flow receiver inlet (22), wherein the gas flow generator outlet (21) is configured to provide a gas flow (25) in the direction of the gas flow receiver inlet (22) and having a component parallel to the main inlet (10) when the gas flow generator outlet (21) is functionally coupled with a gas flow generator in operation.

The invention relates to an SCR (Selective Catalytic Reduction) denitration system ammonia spraying quantity optimal control system and method based on intelligent feedforward signals. The SCR denitration system ammonia spraying quantity optimal control system based on intelligent feedforward signals is characterized in that as input parameters of a denitration system can be easily influenced by the combustion state of a boiler and for adapting to the requirement of large range of depth change of conditions for a thermal power generating unit, the SCR denitration system ammonia spraying quantity optimal control system based on intelligent feedforward signals takes the historical data of a power plant as the basis, utilizes the idea of data modeling, takes adjustable parameters at the boiler side as input and NOX concentration at the outlet of a hearth as output, utilizes a Least Squares Support Vector Machine algorithm to construct a prediction model which can be used for constructing an intelligent feedforward controller in a ammonia spraying quantity control strategy, and takes dynamic matrix control (DMC) as a main controller and PID as an auxiliary controller to construct a cascade feedback control structure; during the operating process, the intelligent feedforward controller outputs feedforward control signals in real time according to changes of the parameters at the boiler side, quickly gives a response to change of conditions of the unit, and forms an SCR system ammonia spraying quantity optimal control strategy together with feedback control, and can realize quick accurate control of the ammonia spraying quantity.

The invention discloses an automatic down filling machine, and belongs to the technical filed of a stowage unit for down and feather filled products. The automatic down filling machine comprises a box body, a first down stirring mechanism, a second down stirring mechanism, an electrical automatic control mechanism, a pair of weighing metering mechanisms, a pair of down output mechanisms, a pair of down filling heads and a box cavity channel start-and-stop mechanism. The box body comprises a box frame, a down storage box and a down delivering box. The first down stirring mechanism is used for stirring down in a down storage box cavity, and the second down stirring mechanism is used for stirring down in a down delivering box cavity. The pair of weighing metering mechanisms is connected with a pair of down leading out connector pipelines on two sides of the down delivering box, the pair of down output mechanisms is connected with the pair of weighing metering mechanisms, the pair of down filling heads is connected with the pair of down output mechanisms in a matched mode, and the box cavity channel start-and-stop mechanism is placed on the box frame. The electrical automatic control mechanism is provided with an electrical box body, a control panel, a programmable controller, a group of magnetic valves and a high-pressure air storage tank. The automatic down filling machine has the advantages of showing rhythmic continuity of down supplying, being capable of providing guarantee for subsequent continuously weighing and down filling, showing good down filling efficiency, reducing operation intensity of workers, eradicating down wasting and showing good automatic control effect.

A vial shield (1) has a shield main body (10) and a valve element (20). The shield main body (10) includes an annular top plate (11) that is to be laid on top of an upper surface of a stopper (86) that seals a mouth (83) of the vial bottle (80), a plurality of legs (15) extending downward from the top plate (11), and a plurality of claws (16) provided in the plurality of legs (15), the claws being engageable with the mouth (83) of the vial bottle (80). The valve element (20) blocks an opening at the center (12) of the top plate (11). A cut (22) passing through the valve element (20) in a vertical direction is formed in the valve element (20).

A liquid containment system in accordance with the present invention includes a flexible plastic or elastomeric bag with several apertures. Surrounding each aperture is a port member such as a silastic ring. The port member functions at least reduce the escape of airborne particules from the bag while permitting the insertion of a surgical instrument into the bag. The port member may be made at least partially of a silicone based material to provide resistance to damage by ultrasonic tools.

An apparatus for detecting flashback occurrences in a premixed combustor system having at least one fuel nozzle includes at least one photodetector and at least one fiber optic element coupled between the at least one photodetector and a test region of the combustor system wherein a respective flame of the fuel nozzle is not present under normal operating conditions. A signal processor monitors a signal of the photodetector. The fiber optic element can include at least one optical fiber positioned within a protective tube. The fiber optic element can include two fiber optic elements coupled to the test region. The optical fiber and the protective tube can have lengths sufficient to situate the photodetector outside of an engine compartment. A plurality of fuel nozzles and a plurality of fiber optic elements can be used with the fiber optic elements being coupled to respective fuel nozzles and either to the photodetector or, wherein a plurality of photodetectors are used, to respective ones of the plurality of photodetectors. The signal processor can include a digital signal processor.

The invention discloses a welding wire and a method for applying the welding wire on aluminum and aluminum alloy to be welded with steel. The welding wire (3) takes Al-Si solder as matrix, and then alloying elements of Cu, Mn, Zn and microelements of B, Zr and La are added to form a dedicated welding wire. The method comprises the following steps: K-shaped divided edges are formed on both ends of the aluminum and aluminum alloy (5); the angle of the divided edges is 50 plus or minus 5DEG C; a divided edge of 30 plus or minus 5 and a truncated edge of 1.0-2.0mm are formed on the side of a steel piece (4); the steel piece (4) is fixed on a chucking tool with a cooling device; the butt clearance between the aluminum and aluminum alloy (5) and the steel piece (4) is 1.0-2.0mm; a small-scaled pulse AC TIG welding method is adopted for single-side welding to realize double side shaping; a tungsten electrode (2) is hemispherical; the nozzle (1) of a welding gun is inclined to the aluminum side; and the welding wire (3) is continuously fed. The method can successfully realize the effective and fine quality connection of the aluminum and the dissimilar steel material by electric arc braze welding without clad layer, and has the advantages of simple operation, low welding cost, and stable and reliable welding process.

The invention provides a coal-fired power plant boiler system and denitration system operation collaborative optimization method. The method comprises the following steps: the operation of a powder preparation system is optimized and adjusted; the operation of a combustion system is optimized and adjusted; the operation of a denitration system is optimized and adjusted; the coal-fired boiler NOx emission control and the SCR denitration system ammonia escape control are coupled for optimization and adjustment; an optimal operation oxygen quantity range of a coal-fired boiler under different loads and an optimal openness range of a burnt wind nozzle in the optimal oxygen quantity operation range are determined by combining the reductive atmosphere distribution characteristics in a near wall area of a hearth water cooling wall and the denitration ammonia escape conditions; and an optimal denitration efficiency range of the denitration system under different loads is determined. The three system operation collaborative optimization methods, provided by the invention, see the boiler system and the denitration system as a large system; the mutual correlation and influence among the three systems are decoupled from the angle of the large system; and the most economical and safest operation mode of the large system is obtained through optimization.

The invention relates to a preparation method of silicon carbide/zirconium carbide composite ceramic, and relates to inorganic nonmetal material composite ceramic. The preparation method comprises the steps of: dissolving bis(cyclopentadienyl) zirconium dichloride with a solvent under the protection of inert atmosphere, and adding liquid hyperbranched polycarbosilane to obtain a mixture A; and distilling the mixture A under reduced pressure under the protection of inert atmosphere to remove the solvent, and carrying out cracking reaction in inert atmosphere to obtain the silicon carbide/zirconium carbide composite ceramic. According to the invention, bis(cyclopentadienyl) zirconium dichloride is used as a zirconium source, and is used for catalyzing the crosslinking reaction of liquid hyperbranched polycarbosilane, so as to increase ceramic yield; zirconium carbide can inhibit the growth of silicon carbide microcrystal grains, and improve high-temperature resistance and oxidation resistance of the composite material; the zirconium content in the composite ceramic can be controlled by controlling the content of bis(cyclopentadienyl) zirconium dichloride in a hybrid precursor; the liquid hyperbranched polycarbosilane/bis(cyclopentadienyl) zirconium dichloride hybrid precursor is free of oxygen, thus the gas escaped in the high-temperature cracking process is reduced; the ceramic has high compactness; and the preparation method is simple to operate, and is easy for engineering.

Various embodiments of the invention, therefore, provide pumps, and methods for their production. One exemplary embodiment of the invention comprises a ceramic plunger pump assembly. The pump assembly can include a pump body, which defines a pump chamber with an inlet port and an outlet port. The pump body can further define a plunger port disposed between the inlet port and the outlet port. In certain embodiments, the pump assembly can further include a ceramic plunger housing, which defines a cylindrical bore having an interior diameter. The plunger housing can be disposed within the plunger port. The pump assembly can also include a ceramic plunger. In particular embodiments, the ceramic plunger is slidably disposed within the cylindrical bore, such that the ceramic plunger may be reciprocated back and forth within the bore. Thus, the fluid can be moved from the inlet port of the pump chamber to the outlet port of the pump chamber through the reciprocal action of the plunger.

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 provides a low-NOx grate-rotary kiln pellet production technology. The production technology includes spraying a reduction activator into a position, above fresh pellets, in a down-draftdrying section (DDD), and enabling the reduction activator to react with NOx in hot air entering the down-draft drying section (DDD) from a rotary kiln (2) so as to achieve SNCR (selective non-catalytic reduction) denitration. In a preferred scheme, the step of excessively spraying the reduction activator with a catalytic effect into a proper temperature range (950 DEG C) above a material surfaceof a secondary preheating section (PH) is added. The low-NOx grate-rotary kiln pellet production technology solves existing technical problems and has the advantages of lower investment, low runningcost, less ammonia escape and remarkable NOx emission reduction effect.

The invention relates to a flue gas desulfurization and denitration purification recovery system, which comprises an oxidation absorption tower, a separation regeneration system and a concentration crystallization drying device, wherein the oxidation absorption tower comprises an oxidation tank, a flue gas inlet, a spraying filler layer, an atomization oxidation layer, a demister and a flue gas outlet. According to the present invention, flue gas enters the oxidation absorption tower from the flue gas inlet to carry out oxidation absorption on nitrogen oxides, sulfur oxides and heavy metals in the flue gas so as to form the absorption liquid, the purified flue gas is subjected to moisture removing through the demister and then is discharged from the flue gas outlet, anions of the absorption liquid are exchanged into the bed layer in the anion exchange equipment of the separation regeneration system, ammonia water is adopted to perform regeneration on the bed layer, the regenerated ammonium salt solution enters the concentration crystallization drying device, and crystallization drying is performed to form the composite ammonium fertilizer; and the nitrogen oxides, the sulfur oxides and the heavy metals in the flue gas can be removed in the integrated manner, such that the problems of ammonia escape and ammonium salt aerosol in the prior art can be avoided, and characteristics of simple equipment and product resource are provided.

The invention discloses a method and device for controlling NOx concentration in smoke gas of a cement kiln; the device comprises a decomposing kiln, a preheater and a reducing agent supply device, wherein the bottom of the decomposing kiln is communicated with a kiln tail chimney of the cement kiln by an inlet smoke flue; the top of the decomposing kiln is communicated with the preheater by an outlet smoke flue; a plurality of spray guns communicated with the reducing agent supply devices are arranged at or/or in the middle upper part of the decomposing kiln or/and the outlet smoke flue in a layered way; and the device further comprises a central controller and a smoke gas automatic monitoring system, wherein the central controller is connected to the reducing agent supply devices; and the smoke gas automatic monitoring system is used for monitoring NOx concentration and smoke gas flow information in the kiln tail chimney and transmitting the NOx concentration and smoke gas flow information to the central controller. According to the invention, as a reducing agent is sprayed into the decomposing kiln through multi-site combined control, high removal rate of the NOx can be achieved without an SNCR (Selective Non Catalytic Reduction) and SCR (Selective Catalytic Reduction) combined technology.

The invention provides a grate-rotary kiln pellet low NOx production process. The process comprises the following steps that flue gas exhausted from an air draft drying section (DDD) and a first preheating section (TPH) is used as cooling wind and conveyed to an air inlet of a ring-cooling second section (C2), a reducing agent is sprayed into the position of an air box at the bottom of the ring-cooling second section (C2), the reducing agent reacts with NOx in the flue gas exhausted from the air draft drying section (DDD) and the first preheating section (TPH), so that SNCR denitration is realized. The production process and system have the characteristics that the investment is saved, the operation cost is low, and the NOx emission reduction effect is remarkable.

The invention provides a light-emitting diode (LED) epitaxial structure. The LED epitaxial structure comprises a substrate and a semiconductor epitaxial layer, wherein the semiconductor epitaxial layer is arranged on the substrate and comprises an N-type semiconductor layer, a light-emitting layer and a P-type semiconductor layer, and an electron speed reduction layer is further arranged between the light-emitting layer and the N-type semiconductor layer, is used for reducing escaped electrons and is formed by laminating n layers of AlInGaN with thickness of 1-20 nanometers. The electron speed reduction layer is arranged between the light-emitting layer and an N-type semiconductor, is used for reducing the escaped electrons and is formed by laminating n layers of AlInGaN with the thickness of 1-20 nanometers, and thus, the electron speed can be effectively reduced.

The invention relates to a coal-fired boiler SNCR and SCR combined denitration system. The denitration system comprises a boiler SNCR reaction system and a SCR reactor; the boiler SNCR reaction system comprises the boiler, an urea solution distribution module and a metering module, and an urea injection system and an urea supply system which are connected with the urea solution distribution module and the metering module; the urea injection system comprises multilayer-designed short spray guns with upper elevation in a 25m to 40m scope in a boiler furnace combustion zone, and multilayer-designed porous long spray guns having an furnace arch with the boiler, wherein, in each layer, at least one porous long spray gun vertically stretches into the boiler, and extends and passes through the cross section; the SCR reactor is connected with a boiler tail through a flue gas mixer; in the SCR reactor, the multilayer cellular catalyst can be arranged at a space between a coal economizer and an air preheater. According to the method, a mol ratio of ammonia nitrogen in an inlet cross section of the SCR catalyst is uniformly distributed, and denitration efficiency of the SCR reactor is enhanced.