133 results about "Urea" patented technology

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.

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.

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 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 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 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.

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.

The utility model discloses an excavator and a urea box ventilation device thereof. Comprising a mounting plate fixed on a mounting platform through a first fastener, connecting plates arranged at one end of the mounting plate, a top plate vertically connected to the two connecting plates, a protective cover arranged between the connecting plates and the top plate, a filter arranged in the protective cover, and a breather pipe communicated between the filter and a urea box, the top of the protective cover is connected to the bottom of the top plate in a sealed mode, the two sides of the protective cover are connected to the connecting plate in a sealed mode, and the bottom of the protective cover is open. According to the device, the closed protective cover is matched with the high-position filter higher than the urea box, the solution is prevented from flowing backwards and crystallizing through gravity, the dust content of air entering the urea box is reduced, impurity pollution and pipeline blockage are eradicated from the source, air pressure balance of the urea box in the urea solution filling and consuming process is ensured, and normal use of the urea box is maintained; and the service life is prolonged.

The application provides a urea quality sensor measurement value reliability monitoring method and related device, relates to the field of engine aftertreatment systems, and acquires actual urea injection amount consumed in hydrolysis of an SCR aftertreatment system and actual NOx consumption amount consumed in catalytic reduction reaction, calculates a real-time value of urea concentration consumed in hydrolysis according to the actual urea injection amount and the actual NOx consumption amount, acquires a urea concentration measurement value corresponding to the real-time value of urea concentration, and determines whether the urea concentration measurement value output by a urea quality sensor is reliable according to the urea concentration measurement value and the real-time value of urea concentration. Since the real-time value of urea concentration is calculated based on actual hydrolysis and catalytic reduction reaction, the calculation process is not affected by bubbles in a urea tank, the accuracy of the real-time value of urea concentration is ensured, and therefore, even if bubbles appear in the urea tank, whether the urea concentration measurement value is reliable can be accurately determined according to the real-time value of urea concentration.

This application relates to a method, system, and device for online monitoring of urea solution concentration in denitrification, belonging to the technical field of denitrification. The online monitoring method includes: acquiring temperature change values ​​and predicting urea consumption rate based on the temperature change values; acquiring urea detection concentration; calculating a concentration error value based on the urea detection concentration and a set target urea concentration; calculating a urea feedback control quantity based on the concentration error value; calculating a urea feedforward control quantity based on the urea consumption rate and the set target urea concentration; calculating a final urea control quantity based on the feedback control quantity and the feedforward control quantity; and controlling the solution addition pump to operate based on the final control quantity. This application has the beneficial effect of timely capturing dynamic changes in solution concentration, maintaining the stability of the denitrification system, and improving denitrification efficiency.

1. Name of the designed product: packing box (urea cream). 2. Use of the designed product: for packing urea cream. 3. Design points of the designed product: in the pattern. 4. Picture or photo best indicating the design points: front view.

The invention discloses a urea solution metering and distributing device and a system thereof, and relates to the technical field of SCR denitration, the urea solution metering and distributing device specifically comprises a urea solution conveying pipeline, an atomized air conveying pipeline, a flushing pipeline and a filtering structure, the urea solution conveying pipeline comprises a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe is connected with the liquid outlet pipe through a conveying pump; and the liquid outlet end of the liquid outlet pipe is converged with the atomized air conveying pipeline through a mixing pipeline to form a gas-liquid two-phase mixing channel. Through the synergistic effect of the compensation assembly and the conveying pump, rapid adjustment of the urea solution demand quantity is achieved, and the system can adapt to urea demand quantity fluctuation caused by unit load changes. The urea solution is subjected to heat preservation, the crystallization probability of the urea solution in the conveying process is reduced, crystals in the urea solution conveying pipeline are filtered through the filtering structure, the blockage probability of the urea solution conveying pipeline and the spray head is reduced, and the use reliability is improved.

This invention discloses a method, apparatus, equipment, and medium for detecting basic parameters of urea solution, relating to the field of urea detection technology. The method includes: acquiring basic parameters of the urea solution, wherein the basic parameters include at least one of urea solution concentration, urea solution temperature, and urea solution level; and determining whether the urea solution is qualified based on preset parameter thresholds and the basic parameters. This invention can quickly and accurately automatically detect the basic parameters of urea solution, including urea solution concentration, urea solution temperature, and urea solution level, greatly improving the detection efficiency and stability of urea solution, facilitating subsequent improvement of emission quality.

1. Name of the product in this design: Packaging tube (Lovemaker Urea Anti-Cracking Moisturizing Hand Cream). 2. Purpose of this design: For filling hand cream and other personal care products. 3. The key design elements of this product are the combination of shape, pattern, and color. 4. The image or photograph that best illustrates the design's key features: the front view. 5. The design for which protection is sought includes color. 6. The top view is already shown in the perspective view, so the top view is omitted; 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.

Methods and systems are provided for treating water to remove urea from the water by controlling the pH of the water to be in a range of from 3.5 to 5, adding an oxidant to the water, and then subjecting the water to UV radiation to decompose the urea.

1. The name of the design product: packaging bottle (Lovemaker urea soft and tender soothing bath milk). 2. The use of the design product: for filling bath milk and other washing and caring products. 3. The design points of the design product: the combination of shape, pattern and color. 4. The picture or photo that best indicates the design points: front view. 5. The design for which protection is sought includes color. 6. The top view is embodied in the perspective view, and the top view is omitted; the bottom surface of the design product is not easy to see or cannot be seen during use, and the bottom view is omitted.

The utility model discloses a kind of urea nozzle test cleaning trolley, by setting test cleaning component, including L-type support, urea nozzle and collection container, the working condition of urea nozzle is simulated on trolley, external cleaning agent, and then realize the effect of quickly cleaning urea nozzle, by repeatedly simulating urea nozzle work, observe the injection state of collection container inner wall, judge whether urea nozzle is cleaned successfully or whether it needs to be replaced.Compared with prior art, the utility model is integrated by low cost design, so that maintenance personnel can efficiently complete urea nozzle cleaning+test series of work, it is convenient for on-site operation, shorten the repair time, improve fault handling rate, reduce the cost of spare parts replacement.

The invention discloses a dust purification treatment system and method based on a urea production process, and relates to the technical field of chemical production environmental protection, and the dust purification treatment system comprises an air inducing unit, a washing absorption unit, a circulating treatment unit, a recovery unit and a tail gas treatment unit. Through the multi-unit collaborative design, an efficient dust purification treatment system is constructed, and the air inducing unit adopts the fan and pipeline design with specific parameters, so that stable suction and conveying of dust are ensured, and the dust is prevented from being accumulated and blocked in the pipeline; the washing and absorbing unit strengthens the gas-liquid countercurrent contact effect by optimizing a washing tank structure and a spraying system, so that the urea component in the dust is fully absorbed; and the circulating treatment and recovery unit is combined with a concentration monitoring and grading recovery mechanism, so that the washing efficiency is ensured, the urea in the absorption liquid is effectively recycled, and the resource waste is reduced.

The utility model discloses a large granular urea granulation system with a pressure regulating function, which comprises a urea dissolving tank and a granulator which are connected through a process pipeline, and a urea melt pump, a second flowmeter, a pressure sensor, an electromagnetic valve and a urea booster pump are sequentially mounted on the pipeline between the urea dissolving tank and the granulator. The electromagnetic valve and the urea booster pump are arranged in parallel with the first flow meter; the pressure sensor and the electromagnetic valve are both connected with a computer; a filter screen is mounted at the bottom of an inner cavity of the urea dissolving tank, a heat exchange pipe is mounted above the filter screen, and a heat exchange jacket is arranged outside the urea dissolving tank. The large-particle urea granulation system provided by the utility model can solve the problems that the injection pressure of the urea spray head is reduced and the formed urea particles are small due to the change of the flow of molten urea, and also can solve the problem that the spray head is blocked due to insufficient melting of the urea.

The present application relates to a kind of urea[ 13 C] reagent, by weight parts, urea[ 13 C] reagent includes urea[ 13 C] 10-75 parts;Citric acid 800-2500 parts;Mannitol 500-3000 parts;And flavoring agent 20-50 parts;Flavoring agent includes at least one of stevioside, sucralose, neotame and thaumatin.The present application reduces the amount of mannitol, without the need for a large amount of mannitol, to meet the quality requirements of product, reduce the risk of patients using drug, product appearance and content are stable and no impurities in normal temperature storage environment, product can be continuously maintained for 6 months in high temperature and high humidity environment.

The invention relates to anti-freezing and anti-cracking hand cream which comprises a water-phase component, an oil-phase component and a functional additive, the water-phase component accounts for 60-70% by weight, the oil-phase component accounts for 25-35% by weight, and the functional additive accounts for 3-8% by weight; wherein the water phase component is prepared from 30 to 40 percent of pure water, 8 to 15 percent of glycerol, 3 to 8 percent of urea, 2 to 4 percent of hyaluronic acid, 1 to 3 percent of maltitol and 0.2 to 0.35 percent of sodium glucoheptonate; and the oil phase component comprises 8-15% of vaseline, 5-10% of mineral oil, 3-8% of shea butter and 2-5% of beewax. The invention further relates to a preparation process of the anti-freezing and anti-cracking hand cream. Five industry pain points of'heavy, mud rubbing, stimulation, short-term effect and instability 'are converted into quantifiable engineering indexes one by one, the magnitude order advantage is obtained in four dimensions of absorption speed, washing resistance, repair rate and low-temperature stability, meanwhile, the process is kept simple, and the cost is controllable.

The utility model relates to urea solution technical field especially is a kind of storage device with heating function, including storage bucket, the top of storage bucket is provided with stirring cleaning assembly, heating assembly is provided in storage bucket, by setting up the cooperation use of stirring motor, stirring blade, first guide frame, first cleaning pad and pressure gauge, urea solution can be stirred while heating, avoid the situation that urea solution appears precipitation in long-time storage process, improve the use quality of urea solution, by setting up first guide frame and second guide frame, first cleaning pad and second cleaning pad can be guided, after starting stirring motor, stirring blade can be stirred inside storage bucket, simultaneously, first cleaning pad and second cleaning pad are in the inner surface wall of storage bucket abut, can clean the inner wall of storage tank, avoid urea solution to adhere on the inner wall of storage tank, and then improve work efficiency.