231 results about "Urea" patented technology

A marine urea aqueous solution preparation device, and a preparation method therefor. The marine urea aqueous solution preparation device comprises a water bath barrel (1), a preparation barrel (2) fixed to an inner wall of the bottom of the water bath barrel (1) by means of a support leg, and a gap between the water bath barrel (1) and the preparation barrel (2) is used to contain fresh water to heat the preparation barrel (2). A top cover (6) is fixed to the top of the preparation barrel (2) by means of multiple bolts, and multiple heaters (11) are fixed to an inner wall of the water bath barrel (1). The urea aqueous solution is stirred by means of a stirring rod (3), which can sequentially drive a swinging structure and an intermittent structure, so that urea particles are intermittently sprinkled into the preparation barrel (2) in small batches.

The invention relates to the technical field of liquid level detection, in particular to a method for eliminating a false liquid level of a urea hydrolyzer, which comprises the following steps: S1, acquiring a liquid level sensor signal, a pressure sensor signal, a temperature sensor signal and an ultrasonic reflection signal of the urea hydrolyzer in real time; s2, performing weighted fusion to generate fused liquid level characteristic parameters; s3, identifying false liquid level characteristics caused by foam layer coverage or steam interference; s4, generating a calibration liquid level value according to the false liquid level characteristics; and S5, comparing the calibrated liquid level value with a preset liquid level-pressure-temperature relation model, and outputting a real liquid level value. According to the invention, by fusing various sensor signals in real time, dynamically adjusting the parameters of the liquid level sensor and combining the liquid level-pressure-temperature relation model, false liquid level interference is accurately eliminated, the accuracy and reliability of liquid level measurement are improved, meanwhile, the equipment safety is ensured, and abnormal operation caused by false liquid level signals is prevented.

The invention relates to the technical field of food safety detection, in particular to a method for detecting urea in bean sprouts and application thereof.The method comprises the following steps that smashed bean sprouts are subjected to two times of ultrasonic extraction and centrifugation, supernate is combined, and an extracting solution is obtained; fixing the volume and filtering to obtain a to-be-detected solution; detecting the liquid to be detected by using liquid chromatography-tandem mass spectrometry; an extraction solvent for ultrasonic extraction is a 5% formic acid-acetonitrile composite solution; the conditions of the liquid chromatography-tandem mass spectrometry are as follows: the chromatographic conditions are as follows: a chromatographic column is an HILIC column; the sample size is 10 [mu] L; a mobile phase is a mixed solution of a 0.02 mmol / L ammonium acetate buffer salt solution and acetonitrile, and isocratic elution is carried out; the flow rate is 0.3 mL / min; the column temperature is 40 DEG C; mass spectrum conditions are as follows: an electrospray ionization (ESI) positive ion mode, electrospray voltage of 4000 V, sheath gas pressure of 30 psi, auxiliary gas pressure of 5 psi, capillary heating temperature of 300 DEG C and scanning mode of MRM. The method disclosed by the invention is free from substance interference, high in sensitivity, accurate in result, low in cost and high in efficiency, and can be used as a standard detection method.

The utility model discloses a urea dissolving device. An existing dissolving tank is only a pure tank body, desalted water and urea are poured into the dissolving tank and then naturally wait for dissolution, the dissolving efficiency is low in the mode, and meanwhile crystals are likely to appear on the inner wall of the dissolving tank after long-time dissolution. The device comprises a dissolving tank, a layering bin is placed in the dissolving tank, the upper portion of the layering bin is connected with the top of the dissolving tank through a bearing, a driven gear is fixed to the layering bin, a support is fixed to the dissolving tank, a driving motor is fixed to the support, and the driving motor is connected with the driven gear. An output shaft of the driving motor is fixed with a driving gear, and the driving gear is meshed with the driven gear; and a scrubbing brush is fixed on the side surface of the layering bin. The urea dissolving device is used for dissolving urea.

The invention relates to the technical field of storage, in particular to a urea solution storage device and a urea solution storage method.The urea solution storage device comprises a tank body, the tank body is composed of a cylindrical barrel and a conical bottom, a liquid discharging pipe is arranged at the lowest point of the conical bottom, and the urea solution storage device further comprises a stirring mechanism and a liquid discharging mechanism, an upper discharging mechanism is coaxially arranged in the hollow pipe; and an aeration mechanism. A high-concentration area and a low-concentration area in the tank body can be mixed to form radial diffusion, so that urea molecules are uniformly dispersed, local concentration supersaturation is avoided, and the device can be regularly started and used in the storage tank; in the synchronous stirring process, the liquid is sucked from the bottom of the hollow pipe and diffused to the periphery from the top of the hollow pipe, so that an axial circulating flow field is formed, and no stirring dead zone exists in the tank body; the aeration mechanism is arranged, released bubbles can generate disturbance in the rising process, the surface tension of the solution is destroyed, the shearing force generated when the bubbles are broken can disperse tiny crystal particles, and the crystal particles are prevented from being agglomerated.

Urea pump module for vehicles, comprising: a housing (10) comprising a partition plate (13) with a urea outlet opening (11) and a plurality of tubes (12) formed in an upper surface thereof, as well as an upper and a lower protective plate (14, 15) which are integrally formed at the upper and lower surface edge of the respective partition plate (13); a cylindrical heating device (20) comprising a first sealing material (23) which is injected over a surface of a cylindrical cooling element (21) coupled to a positive temperature coefficient (PTC) element (22), wherein the heating device (20) has a first fastening opening (24) in an outer circumferential section into which each tube (12) is inserted and fastened; an electric motor (30) comprising a second sealing material (34) which is injected over a surface of a hollow stator (33), wherein a winding runs around an outer circumferential section of the same, and a terminal is provided on its upper side, and wherein the electric motor (30) has a second mounting opening (35) in the outer circumferential section, such that an upper end section of the tube (12) which has been passed through the first mounting opening (24) is inserted into and secured in the second mounting opening (35); and a pump (40) with a rotor (41) rotatably mounted on its upper side, which is inserted into the hollow stator (33) of the electric motor (30), an inlet opening (42) and an outlet opening (43) in a lower section, and a pair of gears (46) rotatably installed therein in forward or reverse rotation, wherein in a state in which the electric motor (30) and the pump (40) are inserted and arranged in a hollow section of the heating device (20), heat from the heating device (20) is transferred to the electric motor (30) and the pump (40) as well as to the urea in the urea tank.

A method for distinguishing metal ions Cu 2+ and Mn 2+ This method utilizes a pH clock reaction system of "urease-CO(NH2)2-H2SO4" as the distinguishing solution, based on the Cu of the sample to be distinguished. 2+ and Mn 2+ The reactions between Cu and the products of urea hydrolysis catalyzed by urease differ, resulting in different patterns produced by the pH clock system, thus enabling the determination of Cu... 2+ and Mn 2+ Qualitative analysis of Cu involved in this invention. 2+ and Mn 2+ The qualitative analysis method is characterized by high accuracy, ease of operation, and convenience.

This invention belongs to the field of urea preparation technology and discloses a large-particle urea, composed of the following raw materials in a specific ratio: a 50% concentration of dilute urine solvent, a urokinase activity inhibitor, and a pigment, in a ratio of 100:6:5. This solution, through the careful design of the 50% concentration of dilute urine solvent, the urokinase activity inhibitor, and the pigment, enhances the soil dissolution rate and utilization rate. The addition of the urokinase activity inhibitor effectively inhibits the rapid hydrolysis of urea, reduces ammonia nitrogen loss, improves nitrogen utilization, mitigates negative environmental impacts, and contributes to soil ecological balance. The use of large-particle morphology and strict moisture control technology ensures the product's moisture resistance and storage stability, extending its shelf life. During production, the temperature is precisely controlled at 30℃, which avoids urine crystallization, ensures the full dissolution of the urokinase activity inhibitor, avoids odors generated at high temperatures, reduces environmental pollution, and improves the product's environmental friendliness.

The present invention pertains to an addition reaction-curable silicone emulsion composition characterized by containing at least one urea-based compound (I) selected from among non-polymer organic compounds having at least one urea group in the molecule, an organopolysiloxane (II) having at least two alkenyl groups in one molecule, and water (VI), with respect to 100.0 parts by mass of the organopolysiloxane (II), the amount of the water (VI) being 10 parts by mass of the at least one urea-based compound (I) being 10 parts by mass or more of the at least one urea-based compound (I), and the amount of the water (VI) being 10 parts by mass or more of the at least one urea-based compound (II). The urea compound (I) is contained in an amount of 1.0 parts by mass or more, and the water (VI) is contained in an amount of 100.0 parts by mass or more. As a result, it is possible to provide: a silicone emulsion composition which has good coatability and adhesion to paper or plastic film base materials, regardless of the type of base material, and which is capable of providing a release film formed from a cured coating film of the silicone emulsion composition; on the other hand, a cured film having an appropriate release force and a high residual adhesion rate with respect to an adhesive can be provided.

Disclosed in the present application are a urea injection amount adjustment method and system based on boiler loads. The method comprises: acquiring urea injection amounts under different boiler loads and historical adjustment logs, and on the basis of the historical adjustment logs, determining historical adjustment parameters and historical adjustment evaluation values; analyzing the historical adjustment parameters and historical adjustment evaluation values of the same urea injection amount, and on the basis of an analysis result, determining a preferred adjustment parameter group of the corresponding urea injection amount; establishing an objective function for maximizing the operation efficiency, analyzing the preferred adjustment parameter group on the basis of the objective function for maximizing the operation efficiency, so as to determine optimal adjustment parameters of a plurality of urea injection amounts under each boiler load, and constructing a boiler load-urea injection amount adjustment model; and on the basis of the boiler load-urea injection amount adjustment model, determining predicted optimal adjustment parameters, and on the basis of the predicted optimal adjustment parameters, generating an adjustment instruction. The method improves the adjustment efficiency and ensures the efficient operation of a boiler, while meeting the requirements of environmental protection indicators.

The disclosure pertains to a urea production process wherein vapor from an evaporation unit for concentrating urea solution is condensed and the resulting process condensate, which contains urea originating from urea entrained in the vapor, is combined with a second urea solution to obtain a dilute urea solution that is suitable e.g. for DEF.

The present invention comprises: a temperature information acquisition unit (120) that acquires first temperature information indicating the temperature of water being treated that is supplied to a reaction tank (180) in which urea in water being treated is treated; a temperature information acquisition unit (130) that acquires second temperature information indicating the temperature of the water being treated that is within the reaction tank (180) or is discharged from the reaction tank (180); and an addition amount adjustment unit (150) that, on the basis of the result of comparing the temperature indicated by the first temperature information and the temperature indicated by the second temperature information, adjusts at least one of the amount of bromide salt added to the water being treated and the amount of hypochlorite added to the water being treated.

1. Name of the product under this design: Packaging bag (urea). 2. Purpose of this design product: used for packaging urea. 3. The key design point of this design product lies in the combination of shape and pattern. 4. The picture or photo that best illustrates the key points of the design: main view. 5. This design product is a flat product, and the left view, right view, top view and bottom view are omitted.

This invention relates to the field of urea raw material purification technology, specifically a novel urea raw material purification device and method. The device includes an upper shell, a cleaning mechanism, a washing and drying mechanism, and a circulating filtration mechanism. A lower shell is fixedly connected to the bottom of the upper shell, and a feed inlet is connected to one end of the upper shell. The cleaning mechanism is located inside the upper shell for cleaning the screening plate. The washing and drying mechanism is located inside the lower shell for washing and drying the urea raw material. The circulating filtration mechanism is located inside the lower shell for filtering and circulating the clean water after washing the urea raw material. This device is not only simple and convenient to operate, but also can fully screen and wash the urea raw material, thereby improving the purity of the urea raw material and thus improving the purity of the produced urea. This eliminates the need for users to perform further purification work, thereby reducing the user's production cycle and production costs.

The invention discloses a urease activity detection method based on a non-reversible reaction of dopamine and resorcinol. The urease activity detection method comprises the following steps: mixing a sample to be detected, a buffer solution with the pH value of 7.0 and a urea solution with a certain concentration; adding a certain amount of dopamine and resorcinol into the mixed solution, under the condition of 25-45 DEG C, catalyzing urea hydrolysis by urease, causing the pH value of the surrounding area of the urease to rise so as to form a local alkaline environment, further inducing the reaction of the dopamine and the resorcinol to generate a blue fluorescent substance, and adding excessive hydrochloric acid to terminate the reaction after the reaction is carried out for 40-120 minutes; and detecting the fluorescence intensity of the reaction liquid by using a fluorospectro photometer, and calculating the urease activity in the sample according to a fluorescence intensity-urease concentration standard curve. The urease activity detection method based on the reaction of dopamine and resorcinol has the advantages of high detection speed, high sensitivity, good selectivity and the like.

The present application relates to the technical field of urea production, and is a urea system flushing evaporation flushing method and device. The urea system flushing evaporation flushing method pre-raises the temperature of the evaporation system before flushing, prevents excessive crystalline substances from blocking the pipeline by intermittently flushing the relevant parts of the second-stage evaporation separator, the top gas phase pipeline of the second-stage evaporation separator, the first-stage evaporation separator and the top gas phase pipeline of the first-stage evaporation separator, ensures that the urea evaporation system runs more stably, and recovers ammonia and other substances in the gas phase separated by evaporation after condensation to reduce the emission of pollutants. The present application has a reasonable and compact structure, a simple process, simple operation, low equipment cost, conforms to the development concept of environmental protection and resource utilization, not only makes the urea product meet the national standard GB2440-2017, but also makes the evaporation system run more stably.

The utility model relates to the technical field of tail gas treatment, in particular to a urea pump installed at the bottom of a urea tank, which comprises a shell, a lower shell, a urea pump chuck and an upper shell which are mutually fixed, the upper shell extends into the urea tank, the urea pump chuck is fixed to the urea tank, the upper shell is provided with a filter module, and the filter module is connected with the urea tank. And an injection pipe is arranged at the bottom of the lower shell. The urea pump is arranged at the bottom of the tank body of the urea tank, no liquid suction pipeline is exposed, the urea pump is integrally divided into an upper part and a lower part, the upper part is embedded into the urea tank, the lower part is located below the urea tank, the liquid suction pipeline is all integrated in the lower shell of the urea pump, the structure is compact, and the structure is compact. The bottom of the urea tank can be heated through the first heating module arranged in the upper part, the low-pressure flow channel and the high-pressure flow channel can be heated through the second heating module arranged in the lower part, and the requirement for unfreezing the urea flow channel in winter is met through the design mode.

1. Name of the design product: urea tank. 2. Use of the design product: for storing of urea solution for automobiles. 3. Design points of the design product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

The utility model discloses an SCR system urea pipe joint which comprises a joint body, a groove is formed in the outer surface of the joint body, an installation ring is arranged on the outer surface of the groove in a sleeved mode, two fixing rods are installed on the outer surface of the installation ring, and the left ends of the two fixing rods are both fixedly connected with first connecting rods. The ends, close to each other, of the two first connecting rods are fixedly connected with fixed clamping plates. According to the device, the groove is formed in the outer surface of the connector body, the outer surface of the groove is sleeved with the mounting ring, under the cooperation of the two fixing rods, the two fixing clamping plates clamp a connected connecting pipe, it is guaranteed that the connecting pipe is not prone to falling off in the use process in the follow-up process, and the connecting pipe is prevented from falling off easily. And through cooperation of two rotatable rotating rods and two auxiliary clamping plates, the connecting pipe can be reinforced again, and therefore the problems that an existing device can vibrate in the using process, a hose is likely to fall off, and danger is caused are effectively solved through the device.

To provide a construction machine that can improve maintainability of a liquid agent tank placed inside a counterweight.SOLUTION: A hydraulic shovel 1 has: a self-propelled lower running body 2; an upper rotating body 3 rotatably mounted on the lower running body 2; a front device 4 provided at a front side of the upper rotating body 3 so as to be able to move up and down; and a counterweight 20 provided at a rear of the upper rotating body 3. The counterweight 20 has: a storage recess 31 formed on an outer surface (a surface of a rear surface 20A) of the counterweight 20; a urea tank 51 stored inside the storage recess 31 and storing a liquid agent to be supplied to an exhaust purification device 14 arranged in front of the counterweight 20; and a bracket 38 which abuts against the urea tank 51 stored in the storage recess 31 so as to press the urea tank 51 against the storage recess 31 from the outside of the upper rotating body 3 and which holds the urea tank 51 within the storage recess 31.SELECTED DRAWING: Figure 3

The invention provides a urea consumption control method, a urea consumption control device, urea consumption control equipment and a storage medium. The urea consumption control method comprises the following steps: determining a first aging state coefficient of an SCR carrier based on all temperature values and temperature retention time; determining a second aging state coefficient of the SCR carrier based on the whole vehicle mileage and the first map table; weighting the first aging state coefficient and the second aging state coefficient to obtain a third aging state coefficient; the smaller value in the first aging state coefficient and the third aging state coefficient is determined as a target aging state coefficient, the ammonia storage capacity of the SCR carrier considering the aging influence is determined based on the target aging state coefficient, an ammonia storage target value is determined according to carrier ammonia storage, and the urea injection amount is adjusted according to the ammonia storage target value. According to the method, the influence of the vehicle driving mileage on aging is considered, the new aging state coefficient is determined, finally, calculation of the ammonia storage capacity of the SCR carrier is corrected based on the aging state coefficient, the urea injection amount is adjusted, and the effect of reducing the urea consumption in the early stage of the vehicle service life is achieved.

A urea stripping process wherein ammonia and carbon dioxide react at a high pressure to form a urea solution; the urea solution is subject to stripping at high pressure; the process includes urea recovery stages at medium pressure and low pressure; the urea solution effluent from the stripper is further processed at a medium-high pressure, which is between the high pressure and the medium pressure, wherein said urea solution at medium-high pressure is heated by condensation of stripper vapours to obtain dissociation of carbamate.

The present invention discloses a method and device for determining the pump pressure of a urea pump, and a computer-readable storage medium. The method comprises: after detecting first characteristic information of the urea pump, collecting second characteristic information of the urea pump, wherein the first characteristic information includes: pump stroke cycle information of the urea pump and current information of the urea pump; and the second characteristic information includes: current information at characteristic points within the pump stroke cycle of the urea pump, time information corresponding to the characteristic points, and the power supply voltage of the urea pump; determining a pump pressure simulation mode of the urea pump based on the second characteristic information; obtaining a simulated pump pressure of the urea pump based on the pump pressure simulation mode; and determining a target pump pressure of the urea pump during operation based on the simulated pump pressure and the sensed pump pressure, wherein the sensed pump pressure is the pump pressure of the urea pump detected by the sensing component. The present invention solves the technical problem of low injection accuracy caused by deviation in sensor pressure measurement in the related art.

Provided is a urea granulating method by which urea particles having stable quality can be obtained.　The present invention relates to a urea granulating method using a urea granulation tower having: an exhaust port provided at the top thereof; a molten urea spray section; a plurality of air intake ports; and a recovery section for granulated urea particles. In the urea granulation tower, the molten urea spray section is positioned at the upper side of the urea granulation tower, the plurality of air intake ports are positioned at the lower side of the urea granulation tower, the recovery section is positioned at the bottom of the tower below the air intake ports, and the plurality of air intake ports are arranged at intervals in the circumferential direction. The urea granulating method according to the present invention comprises a step for forming urea particles by spraying molten urea inside the urea granulation tower and cooling and solidifying the molten urea by taking in, from the air intake ports, air at the ambient temperature of the urea granulation tower from the bottom to the top, wherein the inside of the urea granulation tower is heated by supplying, in addition to the air at the ambient temperature, heated air at a temperature higher than the ambient temperature.

The embodiment of the invention discloses a urea injection device crystallization blockage detection method and device, equipment and a storage medium. According to the technical scheme provided by the embodiment of the invention, the target blockage characteristic information is matched in the multiple pieces of blockage characteristic information recorded in the preset database according to the multi-modal detection information obtained by performing multi-modal detection on the urea spraying device, and different pieces of blockage characteristic information correspond to crystal blockage characteristics under different crystal blockage degrees; the multi-modal detection information comprises one or a combination of more of noise detection information, vibration detection information, temperature detection information, pressure detection information and urea concentration detection information, the crystallization blockage condition of the urea spraying device can be accurately reflected, and according to the target crystallization blockage characteristic corresponding to the target blockage characteristic information, the crystallization blockage condition of the urea spraying device can be accurately detected. The crystallization blockage of the urea injection device is visually displayed, manual crystallization blockage checking is not needed, and the crystallization blockage detection efficiency of the urea injection device is effectively improved.

The present invention relates to a urea-urethane composition comprising (a) at least one urea-urethane compound with a least one terminal group of formula (I) wherein R1 is a radical selected from the group consisting of C4 to C32 alkyl, C4 to C22 alkenyl, C5 to C12 cycloalkyl, C7 to C24 aralkyl, C6 to C24 aryl, a radical of formula R6-(O-CxH2x]y -, a radical of formula R6-[O-C(=O)-CwH2w]z - and a radical of formula R6-(O-CxH2x)y- [O-C(=O)-CwH2w]z -; R3 is a divalent group selected from the group consisting of an aromatic group and an araliphatic group; R6 is C1 to C32 alkyl; x is an integer from 2 to 4; w is an integer from 2 to 12; y and z is an integer from 1 to 20; (b) at least one aprotic solvent and (c) at least one alkyl ammonium salt, whose alkyl radicals independently of another is unsubstituted or hydroxy-substituted, a process for preparing the composition and the use of said composition in coating compositions as a thixotropic agent for coating formulations.

1. Name of the product in this design: Filling equipment (1). 2. Application of this design: for use in oil or urea solution filling equipment. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model. 5. The bottom surface of this product is a part that is not easily seen or cannot be seen during use, so the bottom view is omitted.

The application discloses a method for instant sensing and early warning of inorganic salt impurity content in urea, comprising: calibration reference database, including: pure urea solution density-temperature-concentration reference curve and data table calibration, typical inorganic salt impurity conductivity characteristic calibration and mixed urea solution conductivity-impurity content mapping relationship calibration; real-time acquisition of field data; calculation of inorganic salt impurity static content, including: calculation of total inorganic salt impurity concentration in the current urea solution; combined with urea dissolving tank geometric parameters and real-time liquid level data of the urea dissolving tank, the total mass of the inorganic salt impurity in the dissolving tank is calculated; dynamic calculation of impurity increment per unit time, based on multiple groups of static impurity mass data collected in continuous time sequence, the increase of the inorganic salt impurity in the urea dissolving system per unit time is calculated; dynamic calibration based on historical data; hierarchical early warning and interlocking control. Corresponding systems, electronic devices and computer readable storage media are also disclosed.

A fluidized bed granulator for granulating with urea or a urea-containing liquid is described, wherein the granulating liquid is supplied via a supply manifold comprising a header and a standpipe. The standpipe is arranged at least partially inside the channel for the secondary gas.