Method and device for producing adblue

Abstract

The invention relates to the technical field of adblue production, in particular to an adblue production method and device. Comprising the following steps: S1, adding industrial urea particles with the purity of 99.7% or above and ultrapure water into a stirrer according to a ratio of 1: 1, and mixing to obtain a uniformly mixed urea solution; s2, feeding the urea solution into a multi-stage filter to remove solid impurities; s3, purifying the urea solution to remove ion impurities; s4, the urea solution is fed into a cooling crystallizer, urea in the urea solution is separated out, and a condensation pipe in the cooling crystallizer is scraped off regularly; s5, washing the vehicle urea crystals; s6, the vehicle urea crystals are subjected to drying treatment; and S7, mixing the adblue crystals with ultrapure water in proportion. According to the cooling crystallizer, crystals are continuously separated out from a urea solution in the cooling crystallizer, and meanwhile, a condensation pipe in the cooling crystallizer is scraped and cleaned regularly, so that the cooling efficiency of the cooling crystallizer on the urea solution is not changed.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle urea production, and in particular to a vehicle urea production method and device. Background Art

[0002] Automotive urea is a liquid used to reduce nitrogen oxide pollution in diesel vehicle exhaust. It is composed of 32.5% high-purity urea (automotive urea crystals) and 67.5% deionized water (ultrapure water). Since the purity of automotive urea crystals (hereinafter referred to as crystals) used in automotive urea is greater than that of ordinary industrial urea crystals, industrial urea crystals need to be purified before they can be used as raw materials for the production of automotive urea. The existing methods for producing automotive urea crystals are divided into cooling crystallization, spray drying and evaporation crystallization. Among them, cooling crystallization is more common in the production of automotive urea crystals due to its high purity of crystals and low energy consumption in the production process.

[0003] In the existing cooling crystallization device, a condenser is provided inside the device to accelerate the temperature reduction of the urea solution when producing automotive urea crystals. The condenser directly exchanges heat with the urea solution to quickly reduce the temperature of the urea solution, thereby reducing the solubility of urea in water, so that the urea solution quickly reaches a supersaturated state and precipitates crystals. However, in the process of urea solution precipitating crystals, since the condenser pipe temperature is the lowest, the urea solution will precipitate crystals on the tube wall of the condenser, resulting in crystal obstruction when the condenser and the urea solution exchange heat, which reduces the heat exchange efficiency between the condenser and the urea solution, resulting in a decrease in the efficiency of crystal precipitation in the urea solution, affecting the normal production of crystals. Summary of the invention

[0004] The present invention provides a method and device for producing automotive urea, in order to solve the defect that crystals precipitated from urea solution on a condenser tube lead to a decrease in the heat exchange efficiency between the condenser tube and the urea solution.

[0005] The technical implementation scheme of the present invention is: a method for producing automotive urea, comprising the following steps: S1: adding industrial urea granules with a purity of more than 99.7% and ultrapure water in a ratio of 1:1 into a stirrer, the stirrer stirs and mixes the industrial urea granules and the ultrapure water, and continuously heats the mixed solution to keep the temperature of the solution between 60°C and 70°C, thereby obtaining a high-concentration and uniformly mixed urea solution; S2: sending the mixed urea solution into a multi-stage filter to remove solid impurities in the urea solution; S3: purifying the urea solution after impurity removal to remove ionic impurities in the urea solution; S4: sending the purified urea solution into a cooling crystallizer for cooling; The crystallizer reduces the temperature of the urea solution entering it to 10°C-20°C, so that the urea in the urea solution precipitates crystals to obtain automotive urea crystals and low-concentration urea solution. At the same time, the automotive urea crystals attached to the condenser in the cooling crystallizer are regularly scraped and collected; S5: the obtained automotive urea crystals are rinsed with ultrapure water; the low-concentration urea solution after crystallization is sent to the agitator for repeated use, and industrial urea granules are added after entering the agitator; S6: the rinsed automotive urea crystals are dried to remove the moisture in the automotive urea crystals; S7: the dried automotive urea crystals are mixed with ultrapure water in proportion to obtain an automotive urea solution with a urea concentration of 32.5%.

[0006] A vehicle urea production device, which is applied to the above-mentioned vehicle urea production method, comprises: a support frame, the support frame is provided with the agitator, the agitator is used to mix urea granules and ultrapure water to make a urea solution; a cooling crystallizer is arranged on the support frame, the cooling crystallizer is used to cool and crystallize the urea solution; the cooling crystallizer comprises: a condensation shell, which is fixedly connected to the support frame, the condensation shell is communicated with the agitator, an adjustment plate is slidably connected in the condensation shell, and an adjustment telescopic rod is fixedly connected to the condensation shell, the telescopic end of the adjustment telescopic rod is slidably connected to the condensation shell, and the telescopic end of the adjustment telescopic rod is fixedly connected to the adjustment plate; a partition plate is fixedly connected to the condensation shell, the condensation shell is fixedly connected with a condensation pipe, and the condensation pipe is used to cool and crystallize the urea solution Liquid cooling, the adjustment plate is slidably connected to the condenser tube; an electric telescopic rod is fixedly connected to the condenser shell, the telescopic end of the electric telescopic rod is slidably connected to the condenser shell, and the telescopic end of the electric telescopic rod is fixedly connected with a lifting plate; a rotating sleeve is slidably connected to the lifting plate, the rotating sleeve is slidably connected to the condenser tube, and a first spring is arranged between the rotating sleeve and the lifting plate; a lifting frame is rotatably connected to the lifting plate, the lifting frame is slidably connected to the rotating sleeve, and the lifting frame is fixedly connected to a transmission shell; a connecting ring is fixedly connected to the transmission shell through an elastic rope, and a material collection net is fixedly connected to the connecting ring, and the material collection net is fixedly connected to two first arc frames and two second arc frames; an opening and closing mechanism has two, both of which are arranged on the transmission shell, and are respectively used to drive the adjacent first arc frames to move.

[0007] Further description, the rotating sleeve is provided with an arc groove, the lifting frame is provided with a protrusion, and the protrusion of the lifting frame is located in the arc groove of the rotating sleeve and slides.

[0008] It is further explained that the first arc frame and the second arc frame are both fixedly connected with a scraper, and the scraper is used to clean the crystals on the condenser tube.

[0009] Further description, the opening and closing mechanism includes: an adjusting shell, fixedly connected to the first arc-shaped frame, a limiting shell slidably connected inside the adjusting shell, an adjusting rod fixedly connected to the limiting shell, and the adjusting rod is slidably connected to the transmission shell; a connecting plate slidably connected inside the adjusting shell, a soft rope is arranged between the connecting plate and the limiting shell, and the first arc-shaped frame and the second arc-shaped frame are arranged alternately; a connecting rope, fixedly connected to the connecting plate, and both of the second arc-shaped frames are fixedly connected to the connecting rope, and the adjusting shell is slidably connected to the connecting rope.

[0010] Further description, the limiting shell is provided with an annular groove, the adjusting shell is provided with an annular protrusion, and the annular protrusion of the adjusting shell is located in the annular groove of the limiting shell.

[0011] Further description, it also includes: a crushing component, which is arranged on the transmission housing and is used to crush the urea crystals produced on the surface of the condenser tube; the crushing component includes: a limit plate, which is slidably connected in the transmission housing, a tension spring is arranged between the transmission housing and the limit plate, a plurality of extrusion rods are fixed to the limit plate, the extrusion rods are slidably connected to the transmission housing, a plurality of crushing frames are rotatably connected to the transmission housing, a torsion spring is arranged between the crushing frame and the transmission housing, and the extrusion rod is used to push the crushing frame to move; there are two transmission rods, both of which are fixed to the limit plate, the transmission rod is slidably connected to the transmission housing, the transmission rod is fixed to the limit rod, and the limit rod is slidably connected to the second arc frame.

[0012] Further description, the crushing assembly also includes: a limit block, which is slidably connected to the limit plate, and a second spring is arranged between the limit plate and the limit block, and the limit block limits the limit plate; an aggregation assembly, which is arranged on the two limit rods and is used to guide the urea crystals to move toward the aggregation net.

[0013] Further description, the aggregate assembly includes: a negative pressure ring, fixedly connected to the two limit rods, the negative pressure ring is provided with a plurality of through holes, and a one-way valve is provided in the through hole; there are two elastic plates, both fixedly connected to the negative pressure ring, the first arc frame and the second arc frame are both fixedly connected to the elastic plate, the first arc frame and the adjacent second arc frame are both provided with filter nets, and the filter nets in the first arc frame and the adjacent second arc frame are both used to intercept crystals.

[0014] It is further explained that the radii of the upper circular rings of the two elastic plates are both larger than the radii of the corresponding circular arcs of the adjacent edges on the first arc-shaped frame.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention performs cyclic cooling on the urea solution so that the urea solution continuously precipitates crystals in the cooling crystallizer, and at the same time, the condenser tube inside the cooling crystallizer is regularly scraped and cleaned, so that the cooling efficiency of the cooling crystallizer on the urea solution remains unchanged, thereby ensuring the efficiency of producing crystals.

[0016] 2. In the process of cooling and crystallizing the urea solution, the present invention intermittently collects the crystals gathered on the condenser through the collecting net, and takes the collected crystals out of the urea solution, so that the cooling efficiency of the condenser on the urea solution remains unchanged, thereby ensuring the efficiency of crystallization of the urea solution.

[0017] 3. In the process of the scraper moving downward, the first arc frame and the second arc frame drive the scraper to move away from the condenser tube, thereby reducing the situation where the scraper scrapes away the crystals downward and causes some crystals to be deposited in the condenser shell.

[0018] 4. When scraping off the agglomerated crystals, the present invention knocks the crystals through the crushing frame to break the crystals, and at the same time, the negative pressure ring moves downward to generate negative pressure, and the broken crystals are collected into the gathering net, thereby reducing the diffusion of the crystals. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the stirrer, condensation shell and electric telescopic rod of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the partition plate, condenser tube and lifting plate of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the rotating sleeve, lifting frame and transmission housing of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the first arc frame, the second arc frame and the limit rod of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting ring, the first arc frame and the second arc frame of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the first arc frame, the adjustment rod and the adjustment shell of the present invention; Figure 8 It is a three-dimensional structural cross-sectional view of the adjusting rod, the limiting shell and the adjusting shell of the present invention; Figure 9 It is an exploded view of the three-dimensional structure of the first arc frame, the second arc frame and the connecting rope of the present invention; Figure 10 It is a three-dimensional structural cross-sectional view of the transmission housing, the limiting plate and the elastic plate of the present invention; Figure 11 It is a schematic diagram of the three-dimensional structure of the limiting rod, the elastic plate and the negative pressure ring of the present invention.

[0020] In the figure: 1-support frame, 101-agitator, 2-condensation shell, 201-adjusting plate, 202-adjusting telescopic rod, 3-partition plate, 4-condensing tube, 5-electric telescopic rod, 6-lifting plate, 7-rotating sleeve, 8-lifting frame, 9-transmission shell, 10-connecting ring, 11-aggregate net, 12-first arc frame, 13-second arc frame, 14-scraper, 15-adjusting rod, 16-limiting shell, 17-adjusting shell, 171-connecting plate, 18-connecting rope, 19-limiting plate, 20-extrusion rod, 21-crushing frame, 22-transmission rod, 23-limiting rod, 1901-limiting block, 24-elastic plate, 25-negative pressure ring. DETAILED DESCRIPTION

[0021] The present invention will now be described more fully below with reference to the accompanying drawings, in which currently preferred embodiments of the present invention are shown. However, the present invention may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and these embodiments fully convey the scope of the present invention to the skilled person.

[0022] A method for producing automotive urea comprises the following steps: S1: adding industrial urea granules with a purity of more than 99.7% and ultrapure water in a ratio of 1:1 into the stirrer 101, and the stirrer 101 stirs and mixes the industrial urea granules and the ultrapure water, and continuously heats the mixed solution to keep the temperature of the solution between 60° C. and 70° C., thereby obtaining a high-concentration and uniformly mixed urea solution; S2: sending the mixed urea solution into a multi-stage filter to remove solid impurities in the urea solution; S3: purifying the urea solution after impurity removal to remove ionic impurities in the urea solution; S4: sending the purified urea solution into a cooling crystallizer, which lowers the temperature of the urea solution entering the cooling crystallizer to 10°C-20°C, so that urea in the urea solution precipitates crystals to obtain vehicle urea crystals and low-concentration urea solution, and at the same time, regularly scraping and collecting the vehicle urea crystals attached to the condenser tube 4 in the cooling crystallizer; S5: using ultrapure water to rinse the obtained automotive urea crystals; sending the low-concentration urea solution after crystallization into the agitator 101 for repeated use, and replenishing industrial urea granules after entering the agitator 101; S6: drying the washed automotive urea crystals to remove moisture from the automotive urea crystals; S7: The dried automotive urea crystals are mixed with ultrapure water in proportion to obtain an automotive urea solution having a urea concentration of 32.5%.

[0023] like Figures 1 - 7As shown, a vehicle urea production device is applied to the above-mentioned vehicle urea production method, including: a support frame 1, the support frame 1 is provided with a stirrer 101, the stirrer 101 is used to mix urea granules and ultrapure water to make a urea solution; a cooling crystallizer, arranged on the support frame 1, the cooling crystallizer is used to cool and crystallize the urea solution, the cooling crystallizer includes: a condensation shell 2, fixedly connected to the support frame 1, the condensation shell 2 is connected to the stirrer 101, an adjustment plate 201 is slidably connected in the condensation shell 2, and an adjustment telescopic rod 202 is fixedly connected to the condensation shell 2, the telescopic end of the adjustment telescopic rod 202 is slidably connected to the condensation shell 2, and the telescopic end of the adjustment telescopic rod 202 is fixedly connected to the adjustment plate 201; a partition plate 3, fixedly connected to the condensation shell 2, the condensation shell 2 is fixedly connected to a condensation tube 4, and the condensation tube 4 is used to condense the urea solution. The solution is cooled, and the regulating plate 201 is slidably connected to the condenser tube 4; the electric telescopic rod 5 is fixedly connected to the condenser shell 2, and the telescopic end of the electric telescopic rod 5 is slidably connected to the condenser shell 2, and the telescopic end of the electric telescopic rod 5 is fixedly connected to the lifting plate 6; the rotating sleeve 7 is slidably connected to the lifting plate 6, and the rotating sleeve 7 is slidably connected to the condenser tube 4, and a first spring is arranged between the rotating sleeve 7 and the lifting plate 6; the lifting frame 8 is rotatably connected to the lifting plate 6, and the lifting frame 8 is slidably connected to the rotating sleeve 7, and the lifting frame 8 is fixedly connected to the transmission shell 9; the connecting ring 10 is fixedly connected to the transmission shell 9 through an elastic rope, and a material collection net 11 is fixedly connected to the connecting ring 10, and the material collection net 11 is fixedly connected to two first arc frames 12 and two second arc frames 13; the opening and closing mechanism has two, both of which are arranged on the transmission shell 9, and are respectively used to drive the adjacent first arc frames 12 to move.

[0024] Further, such as Figures 4 - 6 As shown, an arc groove is provided in the rotating sleeve 7, and a convex block is provided in the lifting frame 8. The convex block of the lifting frame 8 is located in the arc groove of the rotating sleeve 7 and slides.

[0025] The above scheme aims to solve the problem that in the process of cooling and crystallizing urea solution (hereinafter referred to as solution) in the existing crystallization device, the crystals precipitated in the solution are easily attached to the surface of the condenser 4, resulting in a decrease in the heat exchange efficiency between the condenser 4 and the solution, resulting in a decrease in the production efficiency of automotive urea crystals; a multi-stage filter and a purifier are arranged in the support frame 1, and the multi-stage filter and the purifier are both existing devices, which are not shown in the figure and will not be described in detail, wherein the multi-stage filter is used to filter the solid impurities in the solution, the purifier is used to remove the ionic impurities in the solution, and the agitator 101 is provided with a heating plate for heating the solution therein. The right part of the condensing shell 2 is connected with the agitator 101, which is used to send the filtered and purified urea solution into the condensing shell 2. The left part of the condensing shell 2 is provided with a filtering device, which is not shown in the figure. The filtering device is used to separate the precipitated crystals and the solution, and then the crystallized solution is sent back into the agitator 101 for reuse. The upper part of the condensing shell 2 is provided with a liquid outlet cavity, which is used to collect the cooling medium after heat exchange with the urea solution. The middle part of the condensing shell 2 and the adjusting plate 201 form a crystallization cavity, and the lower part of the condensing shell 2 and the adjusting plate 201 form a liquid inlet cavity. The cooling medium in the liquid inlet cavity and the liquid outlet cavity are both cooling water. Figure 4 As shown, the condensing shell 2 is provided with a water inlet and a water outlet, wherein the water inlet of the condensing shell 2 is communicated with the liquid inlet chamber, and the water outlet of the condensing shell 2 is communicated with the liquid outlet chamber, and the water inlet and the water outlet of the condensing shell 2 are commonly connected with a circulating pump, and the circulating pump is used to circulate and cool the cooling water of the condensing shell 2, and the adjusting telescopic rod 202 is used to drive the adjusting plate 201 to move so that the liquid level of the urea solution in the crystallization chamber is at the same height, and the partition plate 3 is a frustum with a middle portion higher than its edge, so that the collected crystals can move toward the outside thereof along its upper side, and the partition plate 3 divides the crystallization chamber of the condensing shell 2 into an upper and lower portion, wherein the lower portion of the crystallization chamber is used to cool the urea solution so that the urea solution precipitates crystals, and in this embodiment, there are four condensing tubes 4, and the specific distribution is referenced. Figure 3 As shown, the liquid inlet chamber and the liquid outlet chamber in the condensation shell 2 are both connected to the condenser tube 4. The cooling water in the lower liquid inlet chamber of the condensation shell 2 enters the upper liquid outlet chamber through the condenser tube 4. The outer surface of the condenser tube 4 is smooth to reduce the probability of urea crystals adhering thereto. The electric telescopic rod 5 is located at the upper part of the condensation shell 2, and is used to drive the lifting plate 6 to move up and down. Initially, the telescopic end of the electric telescopic rod 5 is in a retracted state.

[0026] Initially, the bump of the lifting frame 8 is located at the upper part of the arc-shaped groove in the rotating sleeve 7. When there is relative movement between the lifting frame 8 and the rotating sleeve 7, the bump of the lifting frame 8 rotates along the arc-shaped groove of the rotating sleeve 7. The condensation shell 2 restricts the moving distance of the rotating sleeve 7, and initially, the first spring on the rotating sleeve 7 is in a compressed state, and the upper side of the rotating sleeve 7 contacts the condensation shell 2; the lifting frame 8 is composed of a round tube and two round rods, and the two round rods are located at the lower part of the round tube; the connecting ring 10 is located at the lower part of the transmission shell 9, and the elastic rope is used to enable relative movement between the connecting ring 10 and the transmission shell 9. The aggregate net 11 is made of a soft material, so that the aggregate net 11 can be bent and deformed to pour out the collected crystals. A vibration motor can be arranged on the lifting plate 6 to transmit vibration to the aggregate net 11 during the process of the aggregate net 11 collecting crystals, so that the aggregate net 11 drives the crystals therein to vibrate and avoid crystal agglomeration. Initially, the elastic rope on the connecting ring 10 is in a stretched state, the upper side of the connecting ring 10 contacts the partition plate 3, and the connecting ring 10 is located below the first arc-shaped frame 12 and the second arc-shaped frame 13. The first arc-shaped frame 12 and the second arc-shaped frame 13 have the same radian and are both 90°, and the two first arc-shaped frames 12 and the two second arc-shaped frames 13 can form a complete ring (as Figure 5 shown); the opening and closing mechanism is used to drive the first arc-shaped frame 12 and the second arc-shaped frame 13 to move, so that the first arc-shaped frame 12 and the second arc-shaped frame 13 move away from the surface of the condensation tube 4 during the downward movement to ensure that they will not contact the crystals scraped off the surface of the condensation tube 4.

[0027] Furthermore, as Figure 5 and Figure 6 shown, scraping plates 14 are fixedly connected to both the first arc-shaped frame 12 and the second arc-shaped frame 13, and the scraping plates 14 are used to clean the crystallization on the condensation tube 4.

[0028] The above solution is used to reduce the size of the crystals during the process of scraping urea crystals; in this embodiment, there are four scraping plates 14, which are respectively located on the first arc-shaped frame 12 and the second arc-shaped frame 13. The scraping plates 14 are used to scrape the crystals generated on the surface of the condensation tube 4. A conical protrusion is arranged on the upper part of the scraping plate 14, and during the upward movement of the scraping plate 14, the conical protrusion is used to concentrate the extrusion force on the crystals on the surface of the condensation tube 4.

[0029] When urea needs to be purified and crystallized, the staff adds industrial urea crystals and ultrapure water into the agitator 101 for mixing, and then filters and purifies the urea solution through a multi-stage filter and a purifier, and then sends the treated urea solution into the crystallization chamber of the condensation shell 2. At this time, the telescopic end of the adjusting telescopic rod 202 is in a retracted state, and the adjusting plate 201 is located at the lower part of the condensation shell 2. After stopping the delivery of the solution into the condensation shell 2, the staff starts the adjusting telescopic rod 202, and the telescopic end of the adjusting telescopic rod 202 drives the adjusting plate 201 to move, so that the liquid level of the solution in the condensation shell 2 moves to a specified height (the height can be set by the staff). After the liquid level of the solution in the condensation shell 2 moves to the specified height, the staff Close the adjustable telescopic rod 202 and start the circulation pump to circulate the cooling water in the condensation shell 2. The cooling water contacts the condensation tube 4 and performs heat exchange, so that the temperature of the surface of the condensation tube 4 drops to between 10°C and 20°C. After the urea solution flows to the vicinity of the condensation tube 4, the urea solution performs heat exchange with the condensation tube 4, the temperature of the urea solution drops and crystals precipitate. After the temperature of the urea solution drops to a specified temperature between 10°C and 20°C, the staff sends the crystals and the urea solution after the crystals are precipitated from the left side of the condensation shell 2 into the filtering device. The filtering device separates the crystals from the crystallized urea solution and sends the separated urea solution into the agitator 101 for reuse. During this process, the liquid level of the urea solution in the condensation shell 2 is always lower than the partition plate 3.

[0030] During the process of cooling the urea solution and precipitating crystals, the staff starts the electric telescopic rod 5 at a fixed time, and the telescopic end of the electric telescopic rod 5 drives the lifting plate 6 to move downward, and the lifting plate 6 drives the rotating sleeve 7 and the lifting frame 8 to move downward, the first spring of the rotating sleeve 7 stretches, and the rotating sleeve 7 moves upward relative to the lifting plate 6, and the arc groove of the rotating sleeve 7 squeezes the protrusion of the lifting frame 8, and the lifting frame 8 drives the parts thereon to rotate until the protrusion of the lifting frame 8 moves to the lower part of the arc groove on the rotating sleeve 7, and the lifting frame 8 stops rotating, and the rotating sleeve 7 and the lifting plate 6 stop moving relative to each other. In this process, the lifting frame 8 moves downward, and the lifting frame 8 drives the transmission shell 9 to move downward. Since the elastic rope on the connecting ring 10 is in a stretched state, the tension of the transmission shell 9 on the connecting ring 10 through the elastic rope is reduced, and the elastic rope on the connecting ring 10 gradually contracts, so that the connecting ring 10 moves upward relative to the transmission shell 9, and the transmission shell 9 drives the first arc frame 12 and the second arc frame 13 to move downward through the opening and closing mechanism, so that the collecting net 11 gradually turns over, and after the elastic rope shrinks, the collecting net 11 turns over to Figure 6 The state shown continues to move downward with the first arc frame 12.

[0031] As the first arc frame 12 moves downward, the first arc frame 12 enters the urea solution and continues to move downward until the first arc frame 12 and the second arc frame 13 are in contact with the adjustment plate 201 (the state of the parts is shown in FIG. Figure 4As shown in the figure, the telescopic end of the electric telescopic rod 5 no longer extends further, and the opening and closing mechanism drives the two first arc frames 12 and the two second arc frames 13 to approach each other. At the same time, the first arc frame 12 and the second arc frame 13 drive the scraper 14 to move synchronously, and after the scraper 14 contacts the outer side of the condenser tube 4, the opening and closing mechanism stops driving the two first arc frames 12 and the two second arc frames 13 to move. At this time, the above four parts form a complete ring (the state of the parts refers to Figure 5 as shown).

[0032] After the scraper 14 contacts the condenser tube 4, the telescopic end of the electric telescopic rod 5 drives the lifting plate 6 to move upward, and the lifting plate 6 drives the rotating sleeve 7 and the parts thereon to move upward and reset. The scraper 14 moves upward to scrape the crystals on the surface of the condenser tube 4, and the crystals fall into the collection net 11 to complete the collection. Until the first arc frame 12 is separated from the urea solution, the scraper 14 completes the scraping of the crystals on the condenser tube 4, and the lifting plate 6 continues to move upward. When the rotating sleeve 7 contacts the condenser shell 2, the rotating sleeve 7 stops moving, and the lifting frame 8 drives the parts thereon to rotate in the opposite direction and reset under the action of the arc groove, and the transmission shell 9 drives the collection through the opening and closing mechanism. The net 11 rotates, and the collecting net 11 drives the crystals therein to rotate, thereby throwing out the urea solution adsorbed on the surface of the crystals to complete the separation. After the connecting ring 10 contacts the partition plate 3, the connecting ring 10 stops moving and the elastic rope thereon is stretched, the upper part of the collecting net 11 no longer moves, and the lower part of the collecting net 11 continues to move upward driven by the opening and closing mechanism, so that the collecting net 11 is gradually turned over and the crystals collected therein are poured out. When the lifting plate 6 is reset, the rotating sleeve 7 and the parts thereon stop moving, the electric telescopic rod 5 is closed, and the opening and closing mechanism drives the first arc frame 12 and the second arc frame 13 to separate, and the scraper 14 is separated from the condenser tube 4 and reset.

[0033] Further, such as Figures 5 - 9 As shown, the opening and closing mechanism includes: an adjusting shell 17, which is fixed to the first arc frame 12, and a limiting shell 16 is slidably connected inside the adjusting shell 17, and an adjusting rod 15 is fixed to the limiting shell 16, and the adjusting rod 15 is slidably connected to the transmission shell 9; a connecting plate 171 is slidably connected inside the adjusting shell 17, and a soft rope is arranged between the connecting plate 171 and the limiting shell 16, and the first arc frame 12 and the second arc frame 13 are arranged alternately; a connecting rope 18 is fixed to the connecting plate 171, and the two second arc frames 13 are both fixed to the connecting rope 18, and the adjusting shell 17 is slidably connected to the connecting rope 18.

[0034] Further, such as Figure 6 and Figure 7 As shown, the limiting shell 16 is provided with an annular groove, and the adjusting shell 17 is provided with an annular protrusion, and the annular protrusion of the adjusting shell 17 is located in the annular groove of the limiting shell 16 .

[0035] The above scheme is used to increase the distance between the first arc frame 12 and the second arc frame 13 and the condenser 4 during the downward movement of the first arc frame 12 and the second arc frame 13. The lower part of the transmission shell 9 is provided with a round table surface, and the diameter of the upper part of the round table surface is smaller than the diameter of the lower part. When the adjustment rod 15 moves upward relative to the transmission shell 9, the transmission shell 9 pushes the adjustment rod 15 to move in the direction of its axis. The upper part of the adjustment rod 15 is provided with an arc surface; the connecting plate 171 is located in the middle of the connecting rope 18, and the two second arc frames 13 are respectively located at adjacent connecting The two ends of the rope 18, the connecting rope 18 pass through the side surfaces of the adjacent first arc frame 12, to ensure that after the second arc frame 13 cannot move, the side surfaces of the second arc frame 13 are fitted with the side surfaces of the first arc frame 12; the annular protrusion of the adjusting shell 17 is used to clamp the annular groove of the limiting shell 16, and the material of the annular protrusion of the adjusting shell 17 is elastic material. The limiting force of the adjusting shell 17 on the limiting shell 16 through the annular protrusion thereon is greater than the resistance encountered by the first arc frame 12 during the normal upward movement, and the limiting shell 16 is always in contact with the adjusting shell 17.

[0036] This section takes the first arc frame 12 on the right side and the parts thereon as an example. In the process of the first arc frame 12 moving downward, the first arc frame 12 drives the adjustment shell 17 and the parts thereon to move downward, and the transmission shell 9 drives the adjustment rod 15 and the parts thereon to move downward. When the first arc frame 12 contacts the adjustment plate 201, the first arc frame 12 and the adjustment shell 17 stop moving, the truncated surface of the transmission shell 9 presses the adjustment rod 15 downward, and the adjustment rod 15 moves downward (at the same time, the adjustment rod 15 moves to the left along the truncated surface of the transmission shell 9), and the adjustment rod 15 drives the limit The limiting shell 16 moves synchronously, so that the adjusting shell 17 drives the first arc frame 12 to move to the left, and at the same time, the limiting shell 16 moves downward relative to the adjusting shell 17, and the limiting shell 16 pulls the connecting plate 171 upward through the soft rope thereon, and the connecting plate 171 pulls the connecting rope 18, so that the two second arc frames 13 are close to the first arc frame 12, until the scraper 14 contacts the condenser 4, the first arc frame 12 and the second arc frame 13 both stop moving, the connecting plate 171 no longer moves upward, and the annular protrusion of the adjusting shell 17 enters the annular groove of the limiting shell 16.

[0037] After the above-mentioned limiting shell 16 is limited by the adjusting shell 17, the transmission shell 9 moves upward and drives the adjusting rod 15 to move upward. The limiting shell 16 drives the first arc frame 12 and the second arc frame 13 to move through the adjusting shell 17, so that the scraper 14 scrapes the surface of the condenser tube 4 until the first arc frame 12 stops moving upward, the collecting net 11 is reset, the adjusting shell 17 stops moving, and the transmission shell 9 drives the adjusting rod 15 to move upward, so that the annular groove of the limiting shell 16 is separated from the annular protrusion of the adjusting shell 17, and the limiting shell 16 is moved upward. The limiting shell 16 moves upward relative to the adjusting shell 17 and reduces the pulling force of the soft rope on the connecting plate 171. At the same time, the adjusting rod 15 moves rightward along the truncated table surface of the transmission shell 9, so that the limiting shell 16 drives the adjacent first arc frame 12 to move in the opposite direction and reset through the adjusting shell 17. The first arc frame 12 and the second arc frame 13 move away from each other, so that the connecting rope 18 extends out of the adjusting shell 17 and drives the connecting plate 171 to move downward and reset, until the limiting shell 16 and the adjusting shell 17 stop moving relative to each other, and the connecting plate 171 stops moving.

[0038] Further, such as Figures 5 - 7 , Figure 10 and Figure 11 As shown, it also includes: a crushing component, which is arranged on the transmission housing 9 and is used to crush the urea crystals produced on the surface of the condenser 4. The crushing component includes: a limit plate 19, which is slidably connected in the transmission housing 9, and a tension spring is arranged between the transmission housing 9 and the limit plate 19. The limit plate 19 is fixed with a plurality of extrusion rods 20, and the extrusion rods 20 are slidably connected to the transmission housing 9. The transmission housing 9 is rotatably connected with a plurality of crushing frames 21, and a torsion spring is arranged between the crushing frames 21 and the transmission housing 9. The extrusion rods 20 are used to push the crushing frames 21 to move; there are two transmission rods 22, both of which are fixed to the limit plate 19, the transmission rods 22 are slidably connected to the transmission housing 9, the transmission rods 22 are fixed with the limit rods 23, and the limit rods 23 are slidably connected to the second arc frame 13.

[0039] Further, such as Figure 7 , Figure 10 and Figure 11 As shown, the crushing assembly also includes: a limit block 1901, which is slidably connected to the limit plate 19, and a second spring is arranged between the limit plate 19 and the limit block 1901, and the limit block 1901 limits the limit plate 19; an aggregation assembly, which is arranged on two limit rods 23 and is used to guide the urea crystals to move toward the aggregation net 11.

[0040] The above scheme is used to break the crystals on the surface of the condenser tube 4 when the resistance encountered by the scraper 14 increases during the process of the scraper 14 scraping the crystals on the surface of the condenser tube 4; the limit plate 19 is used to detect the resistance encountered by the scraper 14 when scraping the crystals, and the limit plate 19 is initially located at the lower part of the transmission housing 9; the extrusion rod 20 is circumferentially and evenly distributed on the upper side of the limit plate 19, and the crushing frame 21 is circumferentially and evenly distributed on the upper side of the transmission housing 9, and the crushing frame 21 is used to knock the crystals formed on the surface of the condenser tube 4; the limit rod 23 is made of a bendable elastic material, so that the limit rod 23 can be bent and rotated relative to the transmission rod 22 The limiting rod 23 is movable, and an annular extrusion portion is provided in the middle part of the limiting rod 23. When the transmission rod 22 drives the limiting rod 23 to move upward, the annular extrusion portion on the limiting rod 23 drives the second arc frame 13 to move upward. A limiting groove is provided in the transmission shell 9. The limiting block 1901 is initially located in the limiting plate 19. The second spring is always in a force storage state, and the second spring provides power for the movement of the limiting block 1901. The aggregation component is used to guide the solution to flow into the aggregation net 11 during the process of knocking the crystal, so that the solution guides the broken crystal to move synchronously, thereby reducing the amount of the broken crystal spreading to the surrounding.

[0041] Further, such as Figure 10 and Figure 11 As shown, the aggregate assembly includes: a negative pressure ring 25, fixedly connected to two limit rods 23, the negative pressure ring 25 is provided with a plurality of through holes, and a one-way valve is provided in the through hole; there are two elastic plates 24, both of which are fixedly connected to the negative pressure ring 25, the first arc frame 12 and the second arc frame 13 are both fixedly connected to the elastic plate 24, the first arc frame 12 and the adjacent second arc frame 13 are both provided with filter screens, and the filter screens in the first arc frame 12 and the adjacent second arc frame 13 are both used to intercept crystals.

[0042] Furthermore, the radii of the upper circular rings of the two elastic plates 24 are both greater than the radii of the corresponding circular arcs of the adjacent edges on the first arc-shaped frame 12 .

[0043] The above scheme is used to attract the broken crystals into the aggregate net 11 during the process of breaking the crystals. The two elastic plates 24 and the negative pressure ring 25 together form a shell with an opening upward. The one-way valve is closed when the negative pressure ring 25 moves downward, so that the internal space of the shell is increased and the solution is sucked downward from the first arc frame 12 and the second arc frame 13 for replenishment. During the upward movement of the negative pressure ring 25, the one-way valve opens, so that the solution in the shell is discharged from the one-way valve. The radius of the inner elastic plate 24 is greater than the inner diameter of the first arc frame 12, and the radius of the outer elastic plate 24 is greater than the outer diameter of the first arc frame 12. The material of the elastic plate 24 is the same as that of the bellows, so that when the elastic plate 24 is reset, it can drive the first arc frame 12 and the second arc frame 13 to move outward. Figure 10 The state of the elastic plate 24 shown inside is a compressed state.

[0044] During the downward movement of the first arc frame 12, after the negative pressure ring 25 contacts the adjusting plate 201, the limit rod 23 stops moving, the second arc frame 13 and the transmission rod 22 stop moving, so that the limit plate 19 stops moving, and the transmission shell 9 moves downward relative to the limit plate 19, so that the tension spring adjacent to the limit plate 19 is stretched. At the same time, the extrusion rod 20 moves upward relative to the transmission shell 9 and squeezes the crushing frame 21. The crushing frame 21 rotates and moves its upper part away from the condenser 4. The crushing frame 21 drives the torsion spring thereon to rotate and accumulate force. In this process, the transmission shell 9 squeezes the adjusting rod 15 downward, and the limit shell 16 moves downward relative to the adjusting shell 17 until the upper side of the limit plate 19 contacts the transmission shell 9, the transmission shell 9 stops moving downward, and the crushing frame 21 stops rotating. At this time, the limit block 1901 enters the limit groove of the transmission shell 9, the limit block 1901 completes the limiting of the limit plate 19, and the limit shell 16 is limited by the adjusting shell 17.

[0045] After the above-mentioned limit block 1901 fixes the limit plate 19, the transmission shell 9 drives the limit plate 19 to move upward through the limit block 1901, and the limit plate 19 drives the limit rod 23 to move upward through the transmission rod 22, so that the limit rod 23 drives the scraper 14 to move upward through the second arc frame 13 to scrape the crystals on the condenser 4. At this time, the urea solution entering between the two elastic plates 24 flows out of the one-way valve of the negative pressure ring 25, and the limit rod 23 drives the second arc frame 13 to move upward. When the crystals on the condenser 4 are agglomerated (until multiple crystals gather together), the resistance of the scraper 14 to scrape the crystals increases, and the resistance of the limit rod 23 to drive the second arc frame 13 to move increases, which increases the downward pulling force of the transmission rod 22 on the limit plate 19. After the sum of the pulling force of the transmission rod 22 and the pulling force of the tension spring on the limit plate 19 is greater than the limiting force of the limit block 1901 on the limit plate 19, the limit block 1901 releases the fixation of the limit plate 19, and the limit plate 19 moves downward relative to the transmission shell 9, and the extrusion force of the extrusion rod 20 on the crushing frame 21 is rapidly reduced. The crushing frame 21 rotates under the action of the torsion spring and knocks the crystals on the surface, so that the crystals in the area are broken, thereby reducing the resistance of the scraper 14 to the upward movement. At the same time, the limit plate 19 drives the limit rod 23 to move downward through the transmission rod 22. At this time, since the first arc frame 12 is fixedly connected to the adjusting shell 17, the first arc frame 12 does not move, the second arc frame 13 does not move, and the limit rod 23 moves downward relative to the second arc frame 13.

[0046] During the downward movement of the above-mentioned limit rod 23, the limit rod 23 pushes the negative pressure ring 25 downward, the elastic plate 24 is stretched, the space formed by the negative pressure ring 25 and the elastic plate 24 increases and the pressure decreases. At this time, the one-way valve of the negative pressure ring 25 is closed, so that the negative pressure ring 25 guides the solution on its upper side to flow into the aggregate net 11. The solution flows and guides the broken crystals to flow into the aggregate net 11, thereby reducing the degree of outward diffusion of the crystals when they are knocked, until the tension spring is reset, the limit plate 19 stops moving, and the negative pressure ring 25 stops moving downward. If no agglomeration occurs, the limit plate 19 moves upward normally with the transmission housing 9 until the first arc frame 12 and the second arc frame 13 are reset and no longer move upward. The tension on the limit plate 19 increases and the above process is repeated to move downward and reset. After that, the above process is repeated to regularly clean the surface of the condenser 4.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for producing automotive urea, characterized in that: The steps include: S1: adding industrial urea granules with a purity of more than 99.7% and ultrapure water in a ratio of 1:1 into a stirrer (101); the stirrer (101) stirs and mixes the industrial urea granules and the ultrapure water, and continuously heats the mixed solution to keep the temperature of the solution between 60° C. and 70° C., thereby obtaining a high-concentration and uniformly mixed urea solution; S2: sending the mixed urea solution into a multi-stage filter to remove solid impurities in the urea solution; S3: purifying the urea solution after impurity removal to remove ionic impurities in the urea solution; S4: sending the purified urea solution into a cooling crystallizer, which lowers the temperature of the urea solution entering the cooling crystallizer to 10°C-20°C, so that urea in the urea solution precipitates into crystals, thereby obtaining automotive urea crystals and low-concentration urea solution, and at the same time, regularly scraping and collecting the automotive urea crystals attached to the condenser tube (4) in the cooling crystallizer; S5: using ultrapure water to rinse the obtained automotive urea crystals; sending the low-concentration urea solution after crystallization into the agitator (101) for repeated use, and replenishing industrial urea granules after entering the agitator (101); S6: drying the washed automotive urea crystals to remove moisture from the automotive urea crystals; S7: The dried automotive urea crystals are mixed with ultrapure water in proportion to obtain an automotive urea solution having a urea concentration of 32.5%.

2. A vehicle urea production device, applied to a vehicle urea production method according to claim 1, characterized in that: Included are: A support frame (1), the support frame (1) being provided with the stirrer (101), the stirrer (101) being used to mix urea granules and ultrapure water to form a urea solution; A cooling crystallizer is arranged on the support frame (1), and is used to cool and crystallize the urea solution. The cooling crystallizer comprises: A condensation shell (2) is fixedly connected to the support frame (1), the condensation shell (2) is connected to the stirrer (101), an adjustment plate (201) is slidably connected inside the condensation shell (2), and an adjustment telescopic rod (202) is fixedly connected to the condensation shell (2), the telescopic end of the adjustment telescopic rod (202) is slidably connected to the condensation shell (2), and the telescopic end of the adjustment telescopic rod (202) is fixedly connected to the adjustment plate (201); The partition plate (3) is fixedly connected to the condensation shell (2); the condensation shell (2) is fixedly connected to a condensation tube (4); the condensation tube (4) is used to cool the urea solution; the adjustment plate (201) is slidably connected to the condensation tube (4); An electric telescopic rod (5) is fixedly connected to the condensing shell (2), the telescopic end of the electric telescopic rod (5) is slidably connected to the condensing shell (2), and the telescopic end of the electric telescopic rod (5) is fixedly connected to a lifting plate (6); A rotating sleeve (7) is slidably connected to the lifting plate (6), the rotating sleeve (7) is slidably connected to the condenser tube (4), and a first spring is provided between the rotating sleeve (7) and the lifting plate (6); A lifting frame (8) is rotatably connected to the lifting plate (6), the lifting frame (8) is slidably connected to the rotating sleeve (7), and the lifting frame (8) is fixedly connected to a transmission housing (9); A connecting ring (10) is fixedly connected to the transmission housing (9) via an elastic rope, a material collecting net (11) is fixedly connected to the connecting ring (10), and the material collecting net (11) is fixedly connected to two first arc-shaped frames (12) and two second arc-shaped frames (13); There are two opening and closing mechanisms, both of which are arranged on the transmission housing (9) and are respectively used to drive the adjacent first arc-shaped frames (12) to move.

3. A vehicle urea production device according to claim 2, characterized in that: The rotating sleeve (7) is provided with an arc-shaped groove, and the lifting frame (8) is provided with a protrusion, and the protrusion of the lifting frame (8) is located in the arc-shaped groove of the rotating sleeve (7) and slides.

4. A vehicle urea production device according to claim 3, characterized in that: The first arc-shaped frame (12) and the second arc-shaped frame (13) are both fixedly connected with a scraper (14), and the scraper (14) is used to clean the crystals on the condenser tube (4).

5. A vehicle urea production device according to claim 4, characterized in that: The opening and closing mechanism comprises: An adjusting shell (17) is fixedly connected to the first arc-shaped frame (12); a limit shell (16) is slidably connected inside the adjusting shell (17); an adjusting rod (15) is fixedly connected to the limit shell (16); and the adjusting rod (15) is slidably connected to the transmission shell (9); A connecting plate (171) is slidably connected inside the adjusting shell (17), a soft rope is provided between the connecting plate (171) and the limiting shell (16), and the first arc-shaped frame (12) and the second arc-shaped frame (13) are arranged in a staggered manner; The connecting rope (18) is fixedly connected to the connecting plate (171), and the two second arc-shaped frames (13) are both fixedly connected to the connecting rope (18), and the adjusting shell (17) is slidably connected to the connecting rope (18).

6. A vehicle urea production device according to claim 5, characterized in that: The limiting shell (16) is provided with an annular groove, the adjusting shell (17) is provided with an annular protrusion, and the annular protrusion of the adjusting shell (17) is located in the annular groove of the limiting shell (16).

7. A vehicle urea production device according to claim 6, characterized in that: Also included are: A crushing component is arranged on the transmission housing (9) and is used to crush urea crystals produced on the surface of the condenser tube (4), wherein the crushing component comprises: A limit plate (19) is slidably connected to the transmission housing (9), a tension spring is provided between the transmission housing (9) and the limit plate (19), a plurality of extrusion rods (20) are fixedly connected to the limit plate (19), the extrusion rods (20) are slidably connected to the transmission housing (9), a plurality of crushing frames (21) are rotatably connected to the transmission housing (9), a torsion spring is provided between the crushing frames (21) and the transmission housing (9), and the extrusion rods (20) are used to push the crushing frames (21) to move; The transmission rods (22) have two ends, both of which are fixedly connected to the limit plate (19). The transmission rods (22) are slidably connected to the transmission housing (9). The transmission rods (22) are fixedly connected to the limit rods (23). The limit rods (23) are slidably connected to the second arc frame (13).

8. A vehicle urea production device according to claim 7, characterized in that: The crushing assembly also includes: A limit block (1901) is slidably connected to the limit plate (19), a second spring is provided between the limit plate (19) and the limit block (1901), and the limit block (1901) limits the limit plate (19); The material collection assembly is arranged on the two limiting rods (23) and is used to guide the urea crystals to move in the direction of the material collection net (11).

9. A vehicle urea production device according to claim 8, characterized in that: The aggregate assembly comprises: A negative pressure ring (25) is fixedly connected to the two limit rods (23), the negative pressure ring (25) being provided with a plurality of through holes, each of which is provided with a one-way valve; The elastic plates (24) have two parts, both of which are fixedly connected to the negative pressure ring (25); the first arc frame (12) and the second arc frame (13) are both fixedly connected to the elastic plate (24); the first arc frame (12) and the adjacent second arc frame (13) are both provided with filter screens; the filter screens in the first arc frame (12) and the adjacent second arc frame (13) are both used to intercept crystals.

10. A vehicle urea production device according to claim 9, characterized in that: The radii of the upper circular rings of the two elastic plates (24) are both greater than the radii of the corresponding circular arcs of the adjacent edges on the first arc-shaped frame (12).

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