35 results about "UREA POWDER" patented technology

The disclosure relates to an improved composition of a mixture based on urea. The present disclosure can be broadly described as a more stable powder composition comprising an amount of urea effective for treatment of hyponatremia. The present disclosure is a urea formulation that is a sparkling Urea (may be referred to below as "UreaAide sparkling"). The usual starting dose of urea is 15 grams, twice a day. The UreaAide sparkling is a powder that can come in single use urea dose packet. In one embodiment, the UreaAide sparkling is a single use, 15 gram urea dose packet. The 15 gram urea dosage may vary. For example, the urea dosage may not be a 15 gram dose. The urea dose can be prescribed to be taken once per day or many times throughout the day.

The utility model relates to an advanced treatment device for urea dust recovery liquid. Comprising a stock solution tank, the stock solution tank is connected with a multi-stage filtering unit through a high-pressure pump, a clear liquid outlet of the multi-stage filtering unit is connected with a urea production system, and a concentrated liquid outlet of the multi-stage filtering unit is connected with a sewage treatment system; the method has the characteristics that resources can be recycled, and the treatment load of a sewage treatment system can be reduced.

The invention belongs to the field of urea crushers, and particularly relates to a urea crusher with a feeding auxiliary device, the urea crusher comprises a crusher main body, the top end of the crusher main body is fixedly connected with a feeding frame, the left and right sides of the feeding frame are both provided with movable grooves, and the interiors of the movable grooves are slidably connected with fixed rods; the fixing rod is fixedly connected to an extrusion block, the extrusion block does not make contact with the inner wall of the feeding frame, and auxiliary feeding mechanisms are arranged on the left side and the right side of the extrusion block and used for driving the extrusion block to reciprocate so that the extrusion block can extrude caked urea particles; a stirring mechanism is arranged in the extrusion block and is used for driving the rotating rod to rotate; and through the structural design of the auxiliary feeding mechanism, an extrusion block can reciprocate in a feeding frame, so that caked urea particles are extruded, and the function of rapidly crushing the caked urea particles is achieved.

The present invention discloses a high-temperature ammonia spraying denitrification system and method for the main combustion zone based on urea dry spraying, comprising a coal-fired boiler, a urea dry spraying device and a flue gas recirculation device; a low-nitrogen burner and a SOFA air nozzle are arranged on the side wall of the coal-fired boiler; the urea dry spraying device comprises a urea powder supply device, a urea nozzle and a NO X Concentration detection probe; urea powder supply device is connected to urea nozzle; urea nozzle is located between low nitrogen burner and SOFA air nozzle; NO X The detection end of the concentration detection probe extends into the coal-fired boiler above the SOFA air nozzle, and the signal output end is connected to the urea powder supply device; the flue gas recirculation device includes a recirculating flue gas extraction pipe and an oxygen concentration detection probe; the recirculating flue gas extraction pipe is provided with a first control valve and an extraction pump in sequence along the airflow direction, the extraction end extends into the economizer inlet, and the output end is connected to the urea nozzle; the detection end of the oxygen concentration detection probe extends into the coal-fired boiler below the urea nozzle, and the signal output end is connected to the first control valve.

The utility model particularly relates to a dust removal device for a scraper of a urea prilling tower. Comprising a urea prilling tower scraper, a feed opening of the urea prilling tower scraper is connected with the bottom of a packaging belt conveyor through a lower conical cylinder, and a water seal dustproof unit used for dissolving urea is arranged between the feed opening of the urea prilling tower scraper and the lower conical cylinder. The water seal dustproof unit comprises a dust collection water tank which is arranged on the lower conical cylinder, is provided with a top opening and is used for containing water, and a dust baffle extending into the dust collection water tank is arranged at a discharging opening of the urea prilling tower scraper; the device has the characteristics of preventing dust from overflowing, being environment-friendly, saving resources, reducing the labor intensity of on-site cleaning personnel and preventing urea dust from harming the body health of on-site personnel.

The utility model belongs to the technical field of dust recovery, and particularly relates to a dust recovery system of a urea prilling tower. Comprising a liquid absorption device arranged at an air outlet in the top of a urea prilling tower, a collecting tank is arranged below the liquid absorption device, a circulating tank is arranged below the collecting tank, the collecting tank is communicated with the circulating tank through a circulating downcomer, and the circulating tank is communicated with the liquid absorption device through a circulating pump. The liquid absorbing device comprises a first atomizing nozzle layer, a second atomizing nozzle layer and a flushing nozzle layer which are sequentially arranged from bottom to top; a first-stage separator is arranged between the first atomizing nozzle layer and the second atomizing nozzle layer, a second-stage separator is arranged between the second atomizing nozzle layer and the flushing nozzle layer, a third-stage separator is arranged above the flushing nozzle layer, and the third-stage separator comprises a plurality of air coolers. According to the utility model, the content of urea dust discharged into the atmosphere is reduced, and the environment-friendly requirement is met.

The utility model provides a high-speed negative pressure spraying device for a denitration skid-mounted station, which relates to the technical field of spraying devices and comprises a volute fan, and the output end of the volute fan is connected with a spraying assembly. The spraying assembly comprises a conical air spraying pipe connected with the output end of the volute fan, and the conical air spraying pipe is sleeved with a spraying pipe; the injection pipe sequentially comprises a negative pressure cavity, a folding cavity, a smooth cavity, a release cavity and a flow guide cavity from left to right. According to the utility model, negative pressure can be formed when high-speed air flow passes through the negative pressure cavity, urea powder is sucked into the negative pressure cavity to be mixed with air, and the urea powder is efficiently conveyed to a reaction area through the high-speed air flow to be fully contacted and reacted with NOx, so that the urea is decomposed into ammonia gas, and the denitration efficiency is improved; a urea solution is replaced, and the problems that a traditional liquid reducing agent injection system is uneven in injection, high in equipment complexity and poor in environmental adaptability and has leakage hidden dangers are solved.

The utility model relates to the technical field of urea dust, and discloses an efficient urea dust recycling mechanism which comprises a box body, a foot stool, a repair window, a sliding shaft, a first base, a fixing block and a fixing assembly, the foot stool is fixedly connected to the bottom of the box body, the repair window is arranged in the box body, the fixing assembly is arranged at the front end of the box body, and the sliding shaft is fixedly connected to the bottom of the box body. A first base is fixedly connected to the interior of the box body, a sliding shaft is slidably connected to the interior of the first base, and a fixing block is fixedly connected to the exterior of the sliding shaft; compared with cleaning through a scraper blade, a stirring block makes contact with a fixed shaft, a rotating round frame of the stirring block rotates in a box body, a Z-shaped rotating support drives a sliding shaft to slide in a first base, then the sliding shaft is reset through a spring, the sliding shaft flaps a filter screen, and therefore the filter screen is cleaned through the stirring block and the fixed shaft. Dust accumulated in the filter holes can fall off, so that the filter screen is prevented from being blocked by the dust, and the filter effect is improved.

The utility model provides vehicle urea concentration ratio adjusting equipment which comprises a urea powder placing structure, the urea powder placing structure comprises a placing bin, a plurality of conducting grooves are formed in the outer wall of the placing bin, fan blades are arranged on the outer walls of the two sides of the conducting grooves, and attaching rings are arranged on the inner sides of the two ends of the placing bin. The device is reasonable in design, vehicle urea with fixed powder is placed into the placing bin, then the urea powder placing structure is placed into the proportioning shell, a fixed amount of pure water is injected into the proportioning shell according to the amount of the vehicle urea, the vehicle urea is soaked by the pure water, and the vehicle urea powder is placed into the proportioning shell. Meanwhile, high-pressure gas is in contact with fan blades through a gas inlet, so that the urea powder placement structure rotates, the vehicle urea on the outer side is thrown into the proportioning shell, the thrown-out vehicle urea is dissolved through pure water, and therefore the vehicle urea can be rapidly blended into the pure water in the proportioning shell.

The invention discloses a simple urea granulating, cooling and collecting device, relates to the technical field of urea device granulating and collecting systems, and solves the technical problem of cooling. Comprising a granulation tower, a storage box is fixedly mounted at the top of the granulation tower, a granulation nozzle is mounted on one side, close to the granulation tower, of the storage box in a communicating manner, and a cooling assembly is arranged in the granulation tower; the cooling assembly comprises a first funnel fixedly mounted on the inner wall of the granulation tower, a funnel bracket is fixedly mounted at the inner bottom of the granulation tower, and a second funnel and a third funnel are fixedly mounted on the funnel bracket; compared with the prior art, scraping equipment is omitted, the investment is reduced, the power consumption of the scraping equipment is saved, the operation cost of the urea device is reduced, in addition, cooling coils are arranged on the outer surfaces of the three funnels, the temperature of urea particles is reduced, urea dust is reduced, and the yield of urea is increased.

The utility model relates to the technical field of environmental protection equipment, and provides a urea anti-blocking, crushing and metering integrated system which comprises a weighing bin and a urea crusher connected with the weighing bin, the urea crusher is connected with an external dissolving tank, and the weighing bin is of a structure with a wide upper end and a narrow lower end; a feed port is formed in the upper end of the weighing bin, and a discharge port connected with the urea crusher is formed in the lower end of the weighing bin; and an arch breaking mechanism and a vibrating mechanism are arranged at the discharge hole. According to the system, the urea particles can be prevented from blocking the discharge port of the weighing stock bin, the urea particles can smoothly enter the urea pulverizer through the discharge port, powdery urea is prepared, the specific surface area of materials is effectively increased, and therefore the production efficiency of solution preparation is improved.

The invention provides a method for preparing coal-based quantum carbon dot slow-release urea through sectional drying-fluidized bed granulation, and relates to the technical field of slow-release fertilizer preparation, the method comprises the following steps: S1, coal-based waste is used as a raw material, coal-based quantum carbon dots MCQDs are prepared through a hydrothermal method, a silane coupling agent is added for surface functional modification, and a functional MCQDs dispersion liquid is obtained; s2, industrial urea is smashed and screened, and urea master batches with the particle size ranging from 1.0 mm to 3.0 mm are obtained; in the pre-drying stage, moisture on the surfaces of urea master batches is thoroughly removed through a low-humidity environment, and particle aggregation caused by moisture during MCQDs spraying is avoided; in the medium-temperature setting stage, in an interval lower than the urea decomposition temperature, MCQDs are promoted to form a covalent bond with a urea crystal face through a silane coupling agent, and the bonding stability is improved; the formed bonding structure is locked in the low-temperature curing stage, structural damage caused by temperature fluctuation is avoided, and the problem of decomposition or agglomeration is solved.

Disclosed is a method for the removal of urea dust from the off-gas of a finishing section of a urea production plant. the method comprises subjecting the off-gas to quenching with water so as to produce quenched off-gas. The quenched off-gas is subjected to humidification by mixing said quenched gas stream with a humidification fluid selected from (a) saturated steam and (b) superheated steam mixed with a second aqueous stream, so as to produce a humidified gas stream, subjecting said humidified gas stream to particle separation (i.e., dust removal) by means of a scrubbing liquid in which at least part of the particles in the gas stream are soluble.

The invention discloses a compound fertilizer production system and production process, and belongs to the technical field of urea production, the system comprises a granulation unit and a tail gas treatment unit, the granulation unit comprises a material treatment module, a granulator and a screening cooling device, and the tail gas treatment unit comprises a bag-type dust collector, a washing tower and a flue gas desulfurization device. The invention further provides a production process. Alternate production of the nitrogen-potassium compound fertilizer and common large-particle urea can be achieved through valve switching, an independent production line does not need to be additionally arranged, and the equipment investment and the occupied area are greatly reduced; one set of device meets the production requirements of two products, so that the equipment utilization rate is improved, and the quick response capability of an enterprise to market requirements is enhanced; meanwhile, the system adopts a two-stage tail gas treatment process of'bag dust removal + washing tower absorption ', so that urea dust in the tail gas is efficiently removed, ammonia gas is absorbed through desalted water to generate ammonia water, atmospheric pollution caused by direct emission of the ammonia gas is avoided, and strict environmental protection requirements are met.

This invention relates to the field of urea granulation tail gas purification technology, and particularly to a method for purifying dust and ammonia in the tail gas of large-particle urea granulation. The method includes: passing the tail gas containing urea dust and ammonia through a baffle tower with a dust-washing side and an ammonia-absorbing side; removing urea dust from the tail gas through a dust removal process on the dust-washing side to obtain dust-washed tail gas; introducing the dust-washed tail gas through gas channel holes on the baffle into the ammonia-absorbing side, removing ammonia from the tail gas through an ammonia absorption process to obtain purified tail gas; wherein the dust-washing side and the ammonia-absorbing side are independent of each other, allowing only the dust-washed tail gas to circulate. The ammonium sulfate mother liquor collected from the ammonia-absorbing side is introduced to the dust-washing side through a pipeline and mixed with the mother liquor from the dust-washing side; the remaining mother liquor is recycled after adding acid; a portion of the ammonium sulfate-containing urea mother liquor from the dust-washing side is discharged to the next stage, and the remaining mother liquor continues to be recycled. This invention enables a single device to simultaneously meet the dual emission requirements of dust and ammonia in urea granulation tail gas treatment.

The invention relates to the technical field of urea prilling towers, and particularly provides a urea prilling tower top ammonia removal and dust fall recovery device which comprises a carbon dioxide storage tank, a Venturi ejector, a spray pipe, a stainless steel wire net, a filter cloth bag, an induced draft fan, a back flushing pipeline and a factory air buffer tank. Carbon dioxide gas in a carbon dioxide storage tank enters a venturi ejector, process condensate enters the venturi ejector to form a gas-liquid mixture with carbon dioxide, the gas-liquid mixture enters a spraying pipe to be sprayed out, and a water mist film containing the carbon dioxide gas is formed on a stainless steel wire net; and the water mist film is in contact reaction with air containing free ammonia and urea dust from the prilling tower on the stainless steel wire mesh, so that the effects of fixing ammonia and reducing dust are achieved. The induced draft fan above the filter cloth bag has the suction effect, and the gas is filtered by the filter cloth bag, so that the effect of further reducing dust is achieved. The back flushing pipeline is used for washing and back flushing and drying the filter cloth bag, and the effect that the filter cloth bag can be repeatedly used for dust falling is achieved.

The disclosure relates to an improved composition of a mixture based on urea. The present disclosure can be broadly described as a more stable powder composition comprising an amount of urea effective for treatment of hyponatremia. The present disclosure is a urea formulation that is a sparkling Urea (may be referred to below as “UreaAide sparkling”). The usual starting dose of urea is 15 grams, twice a day. The UreaAide sparkling is a powder that can come in single use urea dose packet. In one embodiment, the UreaAide sparkling is a single use, 15 gram urea dose packet. The 15 gram urea dosage may vary. For example, the urea dosage may not be a 15 gram dose. The urea dose can be prescribed to be taken once per day or many times throughout the day.

The invention relates to a granulation process of large granular urea for coating. The preparation method comprises the following steps: taking screened granular urea as a granulation master batch, putting the master batch into a disc granulator, rotating a disc, spraying a urea formaldehyde solution as a granulation binder, and uniformly dispersing; the preparation method comprises the following steps: spraying a binder on a disc, simultaneously crushing small-particle urea to 10-80 meshes, uniformly scattering the crushed small-particle urea on the granulation master batch sprayed with the binder, rotating the disc for 1-3 minutes, completely wrapping the urea powder on the master batch, continuously spraying the binder and the urea powder, circulating for 4-15 times until the particle size is 3-4.75 mm, and introducing hot air for preliminary drying and preheating for 5-10 minutes. According to the invention, the granulation production cost is obviously reduced, the balling efficiency is improved, and the method is suitable for industrial production; the agglomeration powder coating granulation mode can reduce energy and time required by cooling, the large-particle urea prepared by the process is uniform and round in particle size, smooth in surface and high in particle strength, a coating material is easy to coat on the surface, the coating quality is improved, and the large-particle urea has great industrialization value.

The utility model relates to the technical field of water-soluble fertilizer production, and discloses a urea crusher for water-soluble fertilizer production, which is characterized in that a sealing plate is arranged on the upper surface of a crusher main body above a feeding hole in a sliding manner; crushing motors are symmetrically mounted on the front surface of the crusher main body, crushing rollers are connected to the driving ends of the crushing motors in the crusher main body, a cleaning mechanism is arranged below the crushing rollers in the crusher main body, and the cleaning mechanism comprises a mounting plate arranged in the crusher main body; fixing rods are symmetrically arranged on the upper surface of the mounting plate, lifting rods are arranged at the upper ends of the fixing rods, a cleaning plate is connected to the upper ends of the lifting rods, and a cleaning brush is arranged on the upper surface of the cleaning plate. Through the arrangement of the cleaning mechanism, a cleaning brush on the upper surface of a cleaning plate is in contact with the exterior of the crushing roller, so that the surface of the crushing roller for crushing urea can be cleaned, and waste caused by the fact that crushed urea is attached to the exterior of the crushing roller is avoided.

The utility model provides a large-particle urea tail gas clean recovery treatment device which comprises a granulator, an inner cyclone separator, a cyclone water film pickling device, a recovery circulating pump, an induced draft fan and the like, a tail gas inlet of the inner cyclone separator is positioned in an upper box body of the granulator; a gas phase outlet is formed in the top of a barrel body of the inner cyclone separator; the cyclone water film pickling device is sequentially provided with a spray washing unit, a cyclone water film washing unit and a recovery tank from top to bottom; a washing liquid outlet is formed in the lower end of the cyclone water film washing unit barrel and is connected with a liquid inlet of the recovery tank; a tail gas volute pipe inlet is welded on the outer barrel wall of the cyclone water film washing unit barrel; a gas phase outlet of the inner cyclone separator is connected with a tail gas volute pipe inlet of the cyclone water film washing unit; a liquid outlet of the recovery tank is connected with a recovery circulating pump, an outlet of the recovery circulating pump is connected with a liquid supplementing port and a spraying device, and a clean tail gas outlet is connected with an induced draft fan. The device effectively removes urea dust and free ammonia in the tail gas, and is high in recovery efficiency and stable in operation.

The utility model belongs to the technical field of urea particle conveying, and particularly relates to a urea particle vacuum conveying device capable of removing urea dust, which comprises a urea warehouse, a urea tank, a vacuum tank and a vacuum pump, the urea tank is connected with the urea warehouse through a vacuum pipeline, the urea tank is connected with the vacuum tank through a vacuum pipeline, and the vacuum pump is connected with the vacuum tank through a vacuum pipeline. The vacuum tank is connected with a vacuum pump through a vacuum pipeline, and a water-soluble filtering tank is further arranged on the vacuum pipeline between the urea tank and the vacuum tank; by adding the water-soluble filtering tank, gas containing urea dust can be dissolved in water and separated from the gas after entering the water-soluble filtering tank, the filtered gas is discharged into the air through the vacuum pump after entering the vacuum tank to be buffered, the vacuum valve body cannot be blocked, and after urea dissolved in the water reaches a certain concentration, the water-soluble filtering tank is discharged into the air through the vacuum pump. And adding the solution into a reaction kettle for use from a solution discharge valve.

The utility model relates to the field of environmental protection, and discloses a urea rapid dissolving and storing system for preparing ammonia from urea, which comprises a dissolving tank, a storing tank connected with the dissolving tank, a jet pump, a urea crusher and a urea weighing machine, the volume of the dissolving tank and the volume of the storage tank are both smaller than 3 m < 3 >. The lower portion of the dissolving tank is provided with a first steam input pipeline used for inputting steam into the urea tank. A stirring device is arranged on the dissolving tank; the jet pump is arranged at the lower part of the dissolving tank; the jet flow direction of the jet pump is below the first steam input pipeline; a liquid inlet source of the jet pump is liquid in the dissolving tank; a urea powder filling port is formed in the dissolving tank; and the urea crusher, the urea weighing machine and the urea powder filling port are connected in sequence. According to the system, the production efficiency of the urea solution of the small-volume reaction kettle is improved from two aspects of urea particle pulverization and solid-liquid contact homogenization, so that the system can be arranged in a limited space, and the requirement on the site area is reduced.

The invention discloses a humic acid chelated non-protein nitrogen feed additive and a preparation method thereof. The feed additive is prepared from the following components in parts by weight: humic acid, sulfuric acid aqueous solution, nano molecular sieve catalyst, activated carbon, urea, chelating agent, montmorillonite, food-grade white pigment, and coating agent. The preparation steps basically include: 1) catalyzing humic acid raw materials with activated carbon and nano molecular sieve catalyst to obtain modified humic acid solution; 2) adding urea and chelating agent to the modified humic acid solution, and drying at low temperature to obtain humic acid chelated urea powder; 3) mixing the humic acid chelated urea powder and montmorillonite uniformly, wet granulating, and obtaining humic acid chelated urea particles; 4) vacuum coating the humic acid chelated urea particles to obtain the humic acid chelated non-protein nitrogen feed additive. The humic acid chelated non-protein nitrogen feed additive particles are smooth and uniform in size, and urea can be sustained-released.

The utility model relates to the technical field of urea dust treatment, in particular to wet-process urea dust recovery equipment. In order to solve the problem that existing cloth bag filtering type urea dust recycling equipment has many defects, the novel wet-process urea dust recycling equipment is provided and comprises a dust remover, a dust removal fan, an emptying barrel, a washing circulating tank and a circulating pump, the dust remover comprises a dust removal bin, and a liquid blocking silk screen layer, a spraying layer and a filler layer are sequentially arranged in the dust removal bin from top to bottom. A dust removal discharging port of the dust removal bin is connected with a feeding port of the washing circulating tank, the washing circulating tank is provided with a liquid outlet and a liquid supplementing port, the liquid outlet is communicated with an inlet of the circulating pump, an outlet of the circulating pump is communicated with the multiple nozzles through a circulating pipeline, and the outlet of the circulating pump is further communicated with the granulation dissolving tank through a granulation dissolving pipeline. A dissolving valve is arranged on the granulation dissolving pipeline, the liquid supplementing port is connected with a liquid supplementing pipeline, and a liquid supplementing valve is arranged on the liquid supplementing pipeline. The equipment effectively saves the production cost.

The application provides a urea dust circulation recovery system and method, the urea dust circulation recovery system comprises a dust collecting device, a spraying device is arranged above the dust collecting device, a solution storage device is connected to the bottom of the dust collecting device, the solution storage device is connected to the spraying device through a reflux pipeline, so that urea circulates and flows among the spraying device, the dust collecting device and the solution storage device, and a liquid discharge pipeline is led out on the reflux pipeline. The urea dust circulation recovery system provided by the application not only realizes recycling and reuse of urea solution, but also saves water resources, improves urea yield, reduces production cost, can automatically control the circulation amount and concentration of urea solution according to actual needs, has high automation degree and saves operation and maintenance cost.

The utility model relates to the technical field of urea prilling towers, and particularly provides a urea prilling tower top ammonia removal and dust fall recovery device which comprises a carbon dioxide storage tank, a Venturi ejector, a spray pipe, a stainless steel wire net, a filter cloth bag, an induced draft fan, a back flushing pipeline and a factory air buffer tank. Carbon dioxide gas in the carbon dioxide storage tank enters the venturi ejector, process condensate enters the venturi ejector to form a gas-liquid mixture with carbon dioxide, the gas-liquid mixture enters the spraying pipe to be sprayed out, and a water mist film containing the carbon dioxide gas is formed on the stainless steel wire net. And the water mist film is in contact reaction with air containing free ammonia and urea dust from the prilling tower on the stainless steel wire mesh, so that the effects of fixing ammonia and reducing dust are achieved. The induced draft fan above the filter cloth bag has the suction effect, and the gas is filtered by the filter cloth bag, so that the effect of further reducing dust is achieved. The back flushing pipeline is used for washing and back flushing and drying the filter cloth bag, and the effect that the filter cloth bag can be repeatedly used for dust falling is achieved.

The invention belongs to the field of urea hot-melt recovery, and particularly relates to a dust urea online hot-melt recovery process which comprises the following steps: dust collection: collecting dust screened by a rotary screen into a urea dust hot-melt recovery device through a shuttle pipe; and adding hot melting water: adding 90-100 DEG C steam condensate, desorption waste liquid or 140-145 DEG C liquid discharged from the second desorption tower into the middle lower part of the hot melting tank. The hot melting recovery device is used for carrying out centralized treatment on dust urea in the production process, and a dust packaging link is not needed, so that the problem that dust escapes in the packaging process is avoided from the source, and the production efficiency is improved. And the working environment of a packaging station is effectively improved, and the influence of dust on the health of operators is reduced. The urea which is originally treated as low-value dust is fully recycled and granulated again through links such as hot melting, stirring and circulating dissolving, so that the dust urea is converted into a qualified granular urea product, byproducts generated in the production process are utilized to the maximum extent, and resource waste is reduced.

The utility model discloses a production device for improving urine recovery concentration, which relates to the technical field of urine recovery, and adopts the technical scheme that the production device comprises an underground tank, and a steam condensate pipe, a urea particle pipe and a urea dust pipe are sequentially arranged on the left side of the upper surface of the underground tank from left to right; a liquid level sensor is arranged in the underground tank close to the left side, two first extraction mechanisms are arranged on the upper surface of the underground tank corresponding to the liquid level sensor, liquid outlets of the first extraction mechanisms are communicated with a delivery pipe and a return pipe respectively, and a first control valve is arranged on the return pipe; diluted urine in the underground tank is conveyed to the washing tank, circularly absorbs dust of a granulation system in the washer, increases the concentration to about 45%, and then is conveyed to the urine tank for granulation, and the concentration of the diluted urine conveyed to the urine tank is increased, so that the fluctuation of evaporation temperature and negative pressure caused by the fluctuation of the urine concentration can be avoided; the operation cycle of a large particle system is indirectly prolonged, and meanwhile about 95 tons of 0.3 MPa steam can be saved every month.

The utility model relates to the technical field of compound fertilizer processing, and discloses a swing type crushing structure and a urea crusher thereof, the swing type crushing structure comprises a base, and the base is provided with a plurality of groups of mounting holes; the swinging assembly is arranged on the base and used for driving the crushing structure to swing, the swinging assembly comprises a supporting plate and hydraulic rods, the hydraulic rods are arranged on the base in an array mode, one ends of the hydraulic rods are rotationally connected with the base, the supporting plate is arranged on the hydraulic rods, and the other ends of the hydraulic rods are rotationally connected with the supporting plate; the two ends of each hydraulic rod are provided with ball heads, the ball heads are rotationally connected with ball sockets, the ball sockets are fixedly connected with the base and the supporting plate correspondingly, a controller is arranged between the hydraulic rods, the hydraulic rods are electrically connected with the controller, the hydraulic rods stretch out and draw back intermittently, and the pulverizer body and the screening box swing at a large angle through the swing assembly. And the urea at the corner is driven to move and discharged, so that the urea is prevented from being adhered to the corner of the crusher main body and the screening box.