311 results about "Urea" patented technology

The invention discloses a compound containing a urea structure as well as a preparation method and application of the compound in a color developing agent, and relates to the technical field of color developing agents. The compound containing the urea structure is a # imgabs0 # structure as shown in a formula 1. The compound containing the urea structure is synthesized through multiple steps of Suzuki reaction, bromination reaction and substitution reaction. The compound is used as an electron donor to be applied to a thermosensitive color development system and forms a color development composition with a phenolic compound and an acidic material, and the activation temperature is as low as 60-120 DEG C. The ureido structure stabilizes a reaction intermediate through a hydrogen bond network, enhances the electron transfer efficiency, and significantly improves the color developing sensitivity; the aryl / heteroaryl substituent optimizes the color contrast through the conjugation effect, and meanwhile, the synergistic effect of the hot-melt filler ensures the stability of the system. Compared with a traditional color developing agent, the color developing agent has the advantages of low-temperature activation, high color developing intensity and excellent weather resistance, is suitable for the fields of thermal printing, anti-counterfeiting materials and the like, and overcomes the defects of high reaction temperature and insufficient stability in the prior art.

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: an aqueous sprayable hair tonic with a pH value of 3.0 to 7.0 at 20°C, containing urea and / or a urea derivative in a total amount of 1.0 to 20 wt.%, adenosine in an amount of 0.05 to 3 wt.%, and a buffering system for stabilising the pH value, wherein the hair tonic comprises less than 18 wt.%, preferably at most 10 wt.%, in particular at most 5 wt.% ethanol; and the use of a sprayable aqueous preparation containing adenosine and urea and / or a urea derivative, with an ethanol content of less than 18 wt.%, for the cosmetic treatment of the skin, in particular the scalp.

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 invention relates to a sprayable hair tonic in the form of an oil-in-water emulsion with a pH value of 3.0 to 7.0 at 20 °C, containing at least one water-insoluble oil component (A), at least one non-ionic emulsifier (B), at least one non-ionic co-emulsifier (C), water, and a buffer system for stabilizing the pH value, wherein the water content equals 60 - 90 wt.%, the component (A) is provided in a quantity of 1.5 to 20 wt.%, and the components (B) and (C) are provided in a total quantity of 1 to 12 wt.%. The invention is characterized in that adenosine is provided in a quantity of 0.01 to 3 wt.%, and urea and / or a urea derivative is provided in a total quantity of 1.0 to 25 wt.%. The invention additionally relates to a method for producing sprayable aqueous preparations of adenosine, in which an aqueous solution of adenosine is mixed with a finely dispersed emulsion of an oil component (A), said oil component (A) having an average droplet diameter of less than 1 µm (measured using a device based on the semi-elastic light scattering principle (Zetasizer Nano ZS, 25 °C, square polystyrene cuvette, 12 mm edge length (model DTS0012), dilution: 0.025% w / w in water)), in such a quantity that 1.5 to 20 wt.% of the emulsified oil component (A) is contained in the preparation. While being produced or after being produced and prior to being mixed with the adenosine solution, the emulsion is brought to a phase inversion temperature, and a urea and / or a urea derivative is added to the obtained mixture at room temperature. The invention also relates to the use of a sprayable aqueous preparation containing adenosine and urea and / or a urea derivative, comprising an ethanol content of less than 18 wt.%, for cosmetically treating the skin, in particular the scalp.

Provided is a urea coating composition that has excellent weather resistance and excellent durability. The urea coating composition provided herein possesses both the hardness of the epoxy coating and the elongation rate of the urethane coating, and it has excellent weather resistance and excellent properties of the coating film and thus is suitable for application for coating exterior walls. The urea coating composition provided herein may be applied to the eco-friendly coating of exterior walls of buildings, top coats of waterproof floor materials, DTM (Direct To Metal), and the like, and it may be applied not only for thin film coating but also for thick film coating due to possessing excellent surface hardness and mechanical properties. In addition, the urea coating composition provided herein is a coating composition containing a low content of solvent, and thus it is eco-friendly due to the small generation of volatile organic compounds (VOCs).

The present invention discloses a suspension conveying mechanism for preparing urea solution raw materials, comprising a bracket, a urea bag, and further comprising: a straight track and a curved track, both of which are arranged on the bracket, a plurality of pulleys are rotatably installed on the straight track, and the plurality of pulleys are also rotatably arranged in the curved track, a connecting shaft is rotatably installed between every two of the pulleys, and a connecting frame is fixedly installed between the two connecting shafts; a connecting block is connected to the connecting frame through a stable structure. The present invention reduces the mechanical damage caused by the centrifugal force generated during the gravity pulling and transportation of urea by balancing the urea during the straight suspension conveying and the curved suspension conveying, and at the same time, according to the weight change of the urea itself, the flow rate during the urea preparation is synchronously adjusted, the pouring speed is balanced, the pouring height is adjusted, and the stability and preparation efficiency during the urea preparation and transportation are improved.

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.

The invention discloses a urea detection method, device and system applied to a post-processing system, and belongs to the field of diesel engine post-processing systems.The method comprises the steps that a urea quality value and a urea consumption value are obtained, when the urea quality value and the urea consumption value reach a urea quality alarm threshold value, an alarm signal is generated and forwarded to a cloud platform server, and the urea consumption value is synchronously and continuously uploaded; opening a urea injection valve based on the alarm signal; after the urea injection valve is opened, obtaining a nitrogen oxide concentration value; if the nitrogen oxide concentration value reaches the preset nitrogen oxide threshold value, a three-way electromagnetic valve is started for sampling, and a urea pump is started for working; stopping and synchronously closing the urea pump after the sampling of the three-way electromagnetic valve reaches a preset time, and marking the urea sample as a full bottle state; a sampling signal is generated based on the full bottle state and is used for inspecting the urea in the sampling bottle and judging whether the low-quality urea is qualified or not. According to the invention, urea sampling starting is automatically controlled, and high-precision and real-time detection of urea quality and urea consumption is realized at the same time.

The present invention discloses a compound containing a urea structure, a preparation method thereof, and an application in a developer, which relates to the technical field of developers. The compound containing a urea structure has the structure shown in Formula 1. The compound containing a urea structure is synthesized through multiple steps including a Suzuki reaction, a bromination reaction, and a substitution reaction. This compound is used as an electron donor in a thermosensitive color development system and forms a color development composition with phenolic compounds and acidic substances, and the activation temperature is as low as 60 - 120 °C. Its urea group structure stabilizes the reaction intermediate through a hydrogen bond network, enhances the electron transfer efficiency, and significantly improves the color development sensitivity; the aryl / heteroaryl substituents optimize the color development contrast through a conjugation effect, and at the same time, the hot-melt filler synergistically ensures the stability of the system. Compared with traditional developers, the present invention has both low-temperature activation, high color development intensity, and excellent weather resistance, and is suitable for fields such as thermosensitive printing and anti-counterfeiting materials, solving the defects of high reaction temperature and insufficient stability in the prior art.

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 invention discloses a urea detection method based on urease-ion chromatography combination, a urease protective agent and application of the urease protective agent, and belongs to the technical field of urea detection. The method specifically comprises the following steps: (1) adding a urease protective agent into a urea solution to be detected, shaking and uniformly mixing, and filtering; (2) adding a urease solution into the solution treated in the step (1), uniformly mixing, and then reacting under a water bath condition to decompose urea; and (3) detecting the solution obtained in the step (2) and the standard solution by using an ion chromatograph, and then calculating the content of urea. Through combination of multiple technologies, the detection operation process is remarkably simplified, meanwhile, the quantitative detection limit is reduced, and the sensitivity and accuracy of urea detection are greatly improved; besides, by adding the urease protective agent, the influence of interference substances such as metal ions and nitrogen-containing compounds is effectively eliminated, and the anti-interference capability of the method is remarkably enhanced.

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.

The utility model relates to a urea heating water pipe and device, the urea heating water pipe comprises a water pipe, a frost crack prevention part is arranged in the pipe body of the water pipe, and the frost crack prevention part comprises a spiral elastic piece and a frost crack prevention filling layer; the anti-frost-crack filling layer is arranged in the cavity of the spiral elastic piece or arranged in the cavity of the spiral elastic piece; and the spiral elastic piece is arranged in the frost crack prevention filling layer. According to the utility model, the integrality of the water pipe is not damaged, the process is simple, the production is controllable, and the heating and unfreezing effects on urea are not influenced under the condition of ensuring the flow.