403 results about "Urea" patented technology

The invention discloses a suspension conveying mechanism for urea solution raw material preparation, which comprises a support and a urea bag, and further comprises a straight track and a bent track, the straight track and the bent track are both arranged on the support, a plurality of pulleys are rotatably mounted on the straight track, the plurality of pulleys are also rotatably arranged in the bent track, and the urea bag is arranged on the support. A connecting shaft is rotationally mounted between every two pulleys, and a connecting frame is fixedly mounted between the two connecting shafts; and the connecting block is connected with the connecting frame through a stabilizing structure. According to the invention, by stabilizing and balancing urea in straight-way suspension conveying and curve-way suspension conveying, mechanical damage caused by centrifugal force generated in the urea gravity pulling and conveying process is reduced, and meanwhile, according to the weight change of the urea, the flow velocity during urea preparation is synchronously adjusted, so that the urea preparation efficiency is improved. The pouring-out speed is balanced, the pouring-out height is adjusted, and the stability and the preparation efficiency during urea preparation and conveying are improved.

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 a urea injection pipe structure, a cleaning device and a cleaning method. The urea injection pipe structure comprises a connecting valve and an electromagnetic plug connector installed on the connecting valve, and a flow guide pipe and a conveying pipe are arranged on the two sides of the connecting valve respectively; the fixing disc is installed at the end of the conveying pipe, a plurality of first through holes distributed at equal intervals in the circumferential direction are formed in the fixing disc, and a conveying assembly matched with the first through holes is arranged in the conveying pipe and used for discharging urea in the conveying pipe through the first through holes; and the conduction regulation and control mechanism is arranged on the fixed disc and connected with the conveying assembly, the conduction regulation and control mechanism can act when the conveying assembly moves and adjust the conduction state of the first conduction hole, and when urea crystals are generated in the first conduction hole, the conduction regulation and control mechanism can be controlled to move through the conveying assembly, so that the conduction state of the first conduction hole is adjusted; therefore, the first via hole is always kept in a smooth state.

A product gas treatment device and method for production of ammonia from urea. The device comprises: a urea hydrolyzer (2), a urea solution reacting in the urea hydrolyzer (2) to generate a product gas; a drying device (3) for drying the product gas from the urea hydrolyzer (2); a heating device (8) for evaporating water absorbed by a drying agent from the drying device (3) and returning the drying agent to the drying device (3); a decarbonization device (5) for decarbonizing the product gas from the drying device (3); and a reaction device (9) for providing quicklime powder to the decarbonization device (5).

The utility model relates to the technical field of urea production equipment, and discloses a urea dissolving tank which comprises a dissolving tank body, a feeding hopper is arranged above the dissolving tank body, and a movable discharging assembly comprises sliding rods symmetrically and fixedly connected to the upper portion of the dissolving tank body through a support. The outer portion of the sliding rod is slidably connected with a sliding block, the sliding block is fixedly connected with the feeding hopper, the support is rotationally connected with a two-way lead screw, the outer portions of the two sides of the two-way lead screw are both in threaded connection with moving blocks, and connecting rods are hinged between the moving blocks and the feeding hopper through hinge pieces. A material blocking plate is fixedly connected to the support, the upper surface of the material blocking plate makes contact with the bottom of the feeding hopper, discharging notches are formed in one side of the material blocking plate at equal intervals, and the problem that due to the fact that the discharging position is fixed, materials are prone to accumulation when the materials are not mixed and stirred in time is effectively solved.

The utility model discloses a urea solution dilution and mixing device, which relates to the technical field of solution dilution. The utility model comprises a first input pipe, a first control mechanism is arranged on the first input pipe near the right side, a second input pipe is arranged on the lower side of the first input pipe, a second control mechanism is arranged on the second input pipe near the right side, the right ends of the first input pipe and the second input pipe are both connected with the left side wall of a filter cartridge, a filter mesh sleeve is fixedly installed on the inner wall of the filter cartridge near the middle position, a mixing mechanism is arranged on the lower surface of a sealing cover, a connecting pipe is fixedly installed on the right side surface of the filter cartridge, and a static mixer is installed on the right side surface of the connecting pipe. The utility model has a double mixing and dilution function, so that the mixing is uniform, and the dilution and mixing efficiency is higher, so that the large-scale production needs can be met, and the dilution ratio can be more accurately controlled, so that the impurities in the urea solution can be filtered and purified, so that the urea solution can be processed and used later.

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 discloses a low-temperature urea solution for vehicles. The low-temperature urea solution is mainly prepared from the following raw materials: 31.3 to 32.4 parts of urea, 1 to 10 parts of an oleamide quaternary ammonium salt cation Gemini surfactant and 58.7 to 66.6 parts of water. The ultralow-temperature urea solution is simple in composition, low in price and convenient to prepare, the freezing point of the ultralow-temperature urea solution is lower than-48 DEG C, and the ultralow-temperature urea solution is suitable for being used in northern cold regions in winter and has high application prospects and application value.

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.

The invention discloses a urea concentration regulation and control system and method in a denitration process, and the system comprises an obtaining module which is used for setting the monitoring time interval of each boiler injection region, and obtaining the real-time operation parameters of the corresponding boiler injection region according to the monitoring time interval; the generation module is used for generating a regulation and control instruction of the urea solution in the static mixer according to the real-time operation parameters; the judgment module is used for presetting a urea requirement index, obtaining the actual urea solution concentration after the regulation and control instruction, and judging whether the actual urea solution concentration meets the urea requirement index or not; the regulation and control module is used for generating a correction instruction of regulation and control parameters in the regulation and control instruction according to the judgment result; the accurate regulation and evaluation of the urea concentration are realized, so that the regulated urea solution concentration meets the emission standard of each boiler injection area, the denitration cost is reduced, the denitration efficiency is improved, and the safe and economical operation of the boiler is ensured.

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 invention discloses a urea solution preparation system which comprises a first storage tank, a transportation assembly and a dissolving tank, the first storage tank is used for storing urea particles, the transportation assembly comprises a transportation pipe and a compression part, the transportation pipe is communicated with the first storage tank so that the urea particles in the first storage tank can flow into the transportation pipe, and the compression part is used for compressing the urea particles in the first storage tank. The compression part is used for generating compressed air, the compression part is communicated with the conveying pipe so that the compressed air can flow into the conveying pipe to convey urea particles, and the dissolving tank is communicated with the conveying pipe so that the urea particles in the conveying pipe can flow into the dissolving tank so that the urea particles can be dissolved into a urea solution. The urea solution preparation system has the advantages of low cost, simple structure and the like.

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 invention discloses a urea injection amount adjusting method and system based on boiler loads, and the method comprises the steps: obtaining urea injection amounts and historical adjustment logs of different boiler loads, and determining historical adjustment parameters and historical adjustment evaluation values according to the historical adjustment logs; analyzing the historical adjustment parameter and the historical adjustment evaluation value of the same urea injection amount, and determining an optimal adjustment parameter group corresponding to the urea injection amount according to an analysis result; establishing a maximum operation efficiency objective function, analyzing the optimal adjustment parameter group based on the maximum operation efficiency objective function, determining optimal adjustment parameters of a plurality of urea injection quantities of each boiler load, and constructing a boiler load-urea injection quantity adjustment model; the prediction optimal adjusting parameters are determined based on the boiler load-urea injection quantity adjusting model, the adjusting instruction is generated according to the prediction optimal adjusting parameters, and on the premise that the environmental protection index requirement is met, the adjusting efficiency is improved, and efficient operation of the boiler is guaranteed.

The invention discloses a quantitative detection method for low-concentration urea in ultrapure water, specifically: firstly subject a water sample to vacuum freeze drying treatment; placing the vacuum freeze-dried water sample in a reaction vessel, sequentially adding diacetyl monoxime solution, stabilizer and catalyst into the tube, placing the reaction vessel at high temperature under the condition of a closed tube mouth for reaction; placing the reaction solution after the reaction in a measuring container, measuring the absorbance of the reaction solution with a spectrophotometer and obtaining the concentration of urea in the initial water sample according to a standard curve. The quantitative detection method of the present invention can accurately detect urea with a concentration of 0.5 to 80ug / L in the water body; the method of the present invention first subject a water sample containing low-concentration urea to vacuum freeze drying treatment, and then increasing the concentration of diacetyl monoxime, antipyrine / thiocarbamide to increase the color of the solution after the reaction, thereby effectively reducing the detection lower limit of urea concentration in the water body; at the same time, the method of the present invention accelerates the reaction and increases the stability of color development by adding metal ions, so that the reaction solution after the reaction is placed for a period of time, and the absorbance is almost not reduced compared with the absorbance at 0.

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.

The utility model relates to the technical field of urea production, in particular to an efficient urea dissolving and storing device. Comprising a dissolving tank, a drain tank and a storage tank, the dissolving tank is communicated with the drain tank and the storage tank, and urea is added into the dissolving tank through a urea tank car and / or a bagged urea crane. The temperature of the urea dissolving tank and the temperature of the urea solution storage tank can be automatically controlled, manual adjustment is not needed, and it is ensured that urea is completely dissolved and no crystallization exists in storage; urea particles are injected into the dissolving tank and urea is rapidly dissolved automatically, and manual operation and loading and unloading are not needed.

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 utility model discloses a urea water solution filtering device which comprises a mounting cover, the upper surface of the mounting cover is in an inclined state, the section of the mounting cover is in a circular ring shape, an interception assembly is mounted at the top of the mounting cover and comprises a filtering frame rotationally connected with the outer wall of the top of the mounting cover, and the filtering frame is in a cylindrical shape. A filter screen is arranged at the bottom of the circumferential inner wall of the filter frame, a supporting frame is fixedly connected to the circumferential outer wall of the mounting cover, an intercepting plate is fixedly connected to one end of the supporting frame, the intercepting plate is attached to the upper surface of the filter screen of the filter frame, and the bottom of the circumferential outer wall of the filter frame is fixedly sleeved with a driven gear ring in a centering mode; by arranging the interception assembly, urea water impurities intercepted by the filter screen can be temporarily collected at the same position, later treatment is facilitated, and the situation that the filtering efficiency is affected due to excessive impurity accumulation can also be avoided.

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 relates to a signal tamper-proof diagnosis method and device for a urea pump based on CAN communication, and belongs to the technical field of engine exhaust aftertreatment. The method comprises the steps that a request signal is sent to the urea pump; receiving a fault code signal and a feedback signal sent by the urea pump; based on the feedback signal, the working state and the urea injection amount of the urea pump are determined; and based on at least one of the working state, the urea injection amount and the fault code signal, whether the signal of the CAN bus where the urea pump is located is tampered or not is judged. According to the signal tamper-proof diagnosis method of the urea pump based on CAN communication, whether the message signal fed back by the intelligent urea pump is abnormal or not can be recognized by monitoring the working state and the urea injection amount of the urea pump in real time and combining the fault code signal, if the message signal is abnormal, it is considered that the signal of the CAN bus is tampered, and if not, the signal of the CAN bus is tampered. The intelligent urea pump is suitable for a vehicle adopting the intelligent urea pump based on CAN communication.

The invention discloses a urea solution concentration detection method and related device.The urea solution concentration detection method comprises the steps that in a urea spraying stopping mode, rigidity testing is conducted on a to-be-detected urea solution, and a rigidity coefficient is obtained; determining a stiffness coefficient experimental formula, and determining a stiffness coefficient expression based on the stiffness coefficient experimental formula; determining the solution density of the to-be-measured urea solution based on the rigidity coefficient and a rigidity coefficient expression; the solution concentration of the to-be-detected urea solution corresponding to the solution density is determined based on a preset incidence relation, the preset incidence relation is determined in a calibration mode, and the preset incidence relation is used for representing the incidence relation between the solution density and the solution concentration. According to the process, under the condition that the rigidity coefficient and the rigidity coefficient expression are determined, the solution density is determined, the solution concentration is determined based on the solution density, a urea quality sensor is not adopted, the detection process is not influenced by the environment, and bubbles are prevented from being adhered to the urea quality sensor for a long time; and the obtained urea solution concentration is not accurate.