CN111632495B - Production process of urea for vehicles - Google Patents
Production process of urea for vehicles Download PDFInfo
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- CN111632495B CN111632495B CN202010595494.8A CN202010595494A CN111632495B CN 111632495 B CN111632495 B CN 111632495B CN 202010595494 A CN202010595494 A CN 202010595494A CN 111632495 B CN111632495 B CN 111632495B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
- C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
- C07C273/14—Separation; Purification; Stabilisation; Use of additives
- C07C273/16—Separation; Purification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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Abstract
The application relates to a process for producing urea for vehicles, which comprises the following steps of 1: preparing deionized water; step 2: pretreating raw material urea to obtain pretreated urea; and step 3: introducing nitrogen into the batching device until air in the stirring kettle is exhausted; and 4, step 4: adding the deionized water prepared in the step 1 into a batching device, and heating the deionized water to 55-65 ℃; and 5: adding pre-treated urea to a dosing unit; step 6: after the addition of the pretreated urea is finished, cooling the preparation solution to 4 ℃; and 7: conveying the first purified material to a filtering device to obtain a liquid to be detected; and 8: if the liquid to be detected is qualified, storing the liquid for later use; and if the detection is unqualified, purifying the liquid to be detected to a secondary filtering device, and storing for later use after the liquid is purified to be qualified. This application has and carries out the preliminary treatment to automobile-used urea before carrying out automobile-used urea earlier and prepares, effectively detach the impurity ion on raw materials urea granule surface, reduces the degree of difficulty of purification workshop section to reduction in production cost's advantage.
Description
Technical Field
The application relates to the field of automobile urea production, in particular to an automobile urea production process.
Background
Currently, the SCR scheme has significant advantages in the tail gas emission treatment system of national iv diesel vehicles, and vehicle urea is a necessary additive for the SCR scheme. The automobile urea comprises the components of 32.5% of high-purity urea and 67.5% of deionized water. Engine manufacturers are beginning to use SCR technology to meet environmental sector requirements. The SCR system comprises a urea tank (for loading vehicle urea) and an SCR catalytic reaction tank. The operation process of the SCR system is as follows: when nitrogen oxide exists in the exhaust pipe, the urea tank automatically sprays the automobile urea, the automobile urea and the nitrogen oxide are subjected to oxidation-reduction reaction in the SCR catalytic reaction tank, and pollution-free nitrogen and water vapor are generated and discharged. Automatic deceleration of the vehicle engine can occur if the vehicle is not loaded with urea, or if the purity is insufficient, or if the quality is poor. Meanwhile, the automobile urea with poor quality pollutes the catalyst in the SCR catalytic reaction tank, thereby causing serious consequences.
Publication No. CN106582338A discloses a production process of urea for vehicles, which comprises the following steps: step 1, blanking; pouring the bagged solid urea into a stirring box; step 2, injecting water; injecting ultrapure water and solid urea into the stirring box to be mixed to form a urea solution; step 3, stirring; agitating the urea solution to form a rotational flow; step 4, discharging liquid; and discharging the urea solution out of the stirring box after the urea solution reaches the preset concentration.
The above prior art solutions have the following drawbacks: the bagged solid urea has the problems of transportation and storage, the surface layer of urea particles is used for adsorbing moisture and dust, and the source of the automobile urea impurities comprises impurities brought by raw material urea.
Disclosure of Invention
In order to solve the problem that the production cost is increased due to higher purification difficulty in the prior art, the application aims to provide the production process of the automobile urea, which has the advantages that the automobile urea is pretreated before being prepared, the impurity ions on the surfaces of raw material urea particles are effectively removed, the difficulty of a purification working section is reduced, and the production cost is reduced.
The above object of the present invention is achieved by the following technical solutions: a production process of urea for vehicles comprises the following steps:
step 1: deionized water is prepared by a deionized water machine, and the resistivity of the deionized water is controlled to be 19-23M omega.CM;
step 2: step 1, pretreating the raw material urea by a urea pretreatment mechanism, stirring the raw material urea, and periodically introducing nitrogen at the temperature of 20-45 ℃ into the urea pretreatment mechanism to obtain pretreated urea;
and step 3: introducing nitrogen at the temperature of 40-60 ℃ into the batching device until air in the stirring kettle is exhausted;
and 4, step 4: adding the deionized water prepared in the step 1 into a batching device, and heating the deionized water to 55-65 ℃;
and 5: adding the pretreated urea into the batching device at a constant adding speed in the step 2, continuously stirring while adding the pretreated urea, continuously introducing nitrogen at the temperature of 40-60 ℃, and maintaining the temperature of the prepared liquid at 60 +/-2 ℃;
step 6: after the addition of the pretreated urea is finished, cooling the prepared solution to 4 ℃, and filtering to obtain a first purified material;
and 7: conveying the first purified material in the step 6 to a filtering device to obtain a liquid to be detected;
and 8: if the liquid to be detected in the step 7 is qualified, storing for later use; and if the detection is unqualified, purifying the liquid to be detected to a secondary filtering device, and storing for later use after the liquid is purified to be qualified.
By adopting the technical scheme, the automobile urea is prepared by controlling the quality of the deionized water and pretreating the urea to obtain the high-purity raw material urea, the biuret is removed by cooling and crystallizing in the preparation process, the impurity content of the prepared automobile urea is less than that of the prior art, the difficulty of a purification working section is reduced, and the unqualified detection of the prepared liquid is effectively reduced, so that the quality of the automobile urea is ensured, and the production cost is reduced.
The present application may be further configured in a preferred example to: the batching device comprises a stirring kettle communicated with the deionized water machine, a jacket layer which is integrally formed on the outer wall of the stirring kettle and used for controlling the temperature of liquid materials in the stirring kettle, a urea feeding pipe communicated with the top of the stirring kettle, a metering tank communicated with the urea feeding pipe, a urea preprocessing mechanism communicated with the metering tank, an emptying pipe communicated with the top of the stirring kettle, a stirring mechanism arranged in the stirring kettle and used for stirring the liquid materials and an air heater communicated with the stirring mechanism; the stirring mechanism comprises a hollow rotating rod which is rotatably connected with the stirring kettle, a plurality of hollow stirring rods which are communicated with the periphery of the hollow rotating rod, driven gears which are fixedly connected with the periphery of the end of the hollow rotating rod, a motor which is fixedly connected with the top of the stirring kettle, and a driving gear which is fixedly connected with an output shaft of the motor and can be meshed with the driven gears, wherein the hollow stirring rods are arranged in the stirring kettle; a plurality of first air dispersing holes are formed in the circumferential direction of the hollow rotating rod; a plurality of second air dispersing holes are formed in the circumferential direction of the hollow stirring rod; the end of the hollow rotating rod, which is positioned outside the stirring kettle, is coaxially provided with an air inlet groove communicated with the inside of the hollow stirring rod; the air inlet groove rotates and is connected with an air duct in a sealing way, and the air duct is communicated with the air heater.
By adopting the technical scheme, before dissolving the automobile urea, the compressed air heated by the air heater is continuously introduced into the middle stirring kettle, and then the stirring mechanism is started to accelerate the discharge of the air in the stirring kettle, so that the impurities in the air can be reduced to be mixed into the prepared automobile urea; then feeding deionized water into the stirring kettle, introducing low-pressure steam into the jacket layer to heat the deionized water, and slowly adding and dissolving the raw material urea into the deionized water at a certain speed through a urea feeding pipe when the temperature of the deionized water is raised to 60 ℃ to obtain high-purity vehicle urea to be purified; the compressed air through heating can carry out thermal compensation to the liquid material, makes the liquid temperature be in about 60 ℃, guarantees to have better dissolving effect to raw materials urea, and the compressed air of while heating accelerates the stirring to the liquid material for the urea dissolves more fast, promotes the efficiency of preparing the automobile-used urea workshop section of treating purification.
The present application may be further configured in a preferred example to: the urea pretreatment mechanism comprises a shell, a lifting frame body fixedly connected to the bottom of the shell, a pretreatment tank fixedly connected in the shell, a stirrer arranged in the pretreatment tank and used for stirring urea, a raw urea adding tank communicated with the top of the pretreatment tank, a speed regulating valve communicated with the raw urea adding tank and the pretreatment tank and used for controlling the adding speed of the raw urea, a discharge pipeline fixedly connected in the shell and positioned below the pretreatment tank, and a spiral conveyor rotatably connected in the discharge pipeline and used for conveying urea, wherein the stirrer is communicated with an air heater; the discharge pipeline is communicated with the batching device; the bottom of the pretreatment tank is funnel-shaped and is communicated with a discharge pipe; the discharge pipe is communicated with the discharge pipeline and is positioned at the upper part of the discharge pipeline; the air heater is communicated with the lower part of the pretreatment tank.
Through adopting above-mentioned technical scheme, the impurity among the automobile-used urea derives from raw materials urea itself and the impurity that brings in the preparation process, and the urea raw materials passes through under the effect of agitator and heating nitrogen gas, detach dust impurity and remaining moisture on attached to the urea granule, has promoted the purity of raw materials urea itself to guarantee to prepare the quality of automobile-used urea, reduce and filter purification workshop section equipment load, the going on of guarantee serialization production improves automobile-used urea production efficiency.
The present application may be further configured in a preferred example to: the step 2: and step 1, pretreating the raw material urea through a urea pretreatment mechanism, adding the raw material urea in a raw material urea adding tank into the pretreatment tank at a rate of 10-15kg/min under the control of a speed regulating valve, continuously stirring the raw material urea added into the pretreatment tank, and introducing nitrogen into the pretreatment tank at a temperature of 20-45 ℃ for 2-4s every 5-10s to obtain the pretreated urea.
By adopting the technical scheme, dust impurities and residual moisture attached to the urea particles can be effectively removed, and the high-quality pretreated urea is obtained.
The present application may be further configured in a preferred example to: the urea pretreatment mechanism further comprises an ultrasonic generator arranged on the inner wall of the pretreatment tank.
Through adopting above-mentioned technical scheme, the ultrasonic wave carries out further cleaing away to adnexed dust impurity on the urea granule, promotes the treatment effect to raw materials urea.
The present application may be further configured in a preferred example to: the step 2: and step 1, pretreating the raw material urea through a urea pretreatment mechanism, adding the raw material urea in a raw material urea adding tank into the pretreatment tank at a rate of 10-15kg/min under the control of a speed regulating valve, continuously stirring the raw material urea added into the pretreatment tank, introducing 4s of nitrogen at a temperature of 20-45 ℃ into the pretreatment tank every 10s, introducing the nitrogen and starting an ultrasonic generator simultaneously to obtain the pretreated urea.
By adopting the technical scheme, 4s of nitrogen with the temperature of 20-45 ℃ is introduced into the pretreatment tank every 10s, and the ultrasonic generator is started while the nitrogen is introduced, so that dust impurities attached to the urea particles are effectively removed; and the ultrasonic wave can bring energy and can not be continuously introduced, the ultrasonic generator is intermittently started to avoid the decomposition of urea, and meanwhile, dust impurities which are stirred and can not be removed by nitrogen are removed, so that the quality of the raw material urea is further improved, the difficulty of a purification working section is reduced, and the production cost is reduced.
The present application may be further configured in a preferred example to: the filter device comprises a first conveying pipe communicated with the bottom of the stirring kettle, a microfiltration filter element detachably connected with the first conveying pipe, a second conveying pipe communicated with the first conveying pipe, a first ultrafiltration filter element detachably connected with the second conveying pipe, a third conveying pipe communicated with the second conveying pipe, a second ultrafiltration filter element detachably connected with the third conveying pipe, an inspection pipe communicated with the third conveying pipe, an inspection liquid outlet pipe communicated with the circumferential direction of the inspection pipe, a product storage tank communicated with the inspection pipe, a first communicating pipe communicated with the first conveying pipe and the second conveying pipe and a second communicating pipe communicated with the third conveying pipe and the inspection pipe, wherein one end of the inspection pipe is communicated with the third conveying pipe, and the other end of the inspection pipe is communicated with the product storage tank; a first control valve and a second control valve are sequentially and fixedly communicated with the first conveying pipe along the material flowing direction, and the microfiltration filter element is positioned between the first control valve and the second control valve; a third control valve and a fourth control valve are sequentially and fixedly communicated with the second conveying pipeline along the material flowing direction, and the first ultrafiltration filter element is positioned between the third control valve and the fourth control valve; a fifth control valve and a sixth control valve are sequentially and fixedly communicated with the third conveying pipeline along the material flowing direction, and the second ultrafiltration filter element is positioned between the fifth control valve and the sixth control valve; a seventh control valve and an eighth control valve are sequentially and fixedly communicated with the inspection pipe along the material flowing direction, and an inspection liquid outlet pipe is positioned between the seventh control valve and the eighth control valve; the joint of the first communicating pipe and the first conveying pipe is positioned between the first control valve and the microfiltration filter core, and the joint of the first communicating pipe and the second conveying pipe is positioned between the fourth control valve and the first ultrafiltration filter core; the joint of the second communicating pipe and the third conveying pipe is positioned between the fifth control valve and the second ultrafiltration filter element, and the joint of the second communicating pipe and the inspection pipe is positioned between the eighth control valve and the inspection liquid outlet pipe.
Through adopting above-mentioned technical scheme, automobile-used urea gets into first conveying pipeline earlier and carries out the great solid particle of prefiltration particle diameter and bacterium through the microfiltration filter core, further detach colloid level particle impurity in the material through first ultrafiltration filter core and second ultrafiltration filter core, the virus, from the material of inspection liquid exit tube collection through the ultrafiltration, qualified then flow direction product storage tank storage reserve, if detect unqualifiedly, flow direction refilter device, carry out the refilter until the material detects qualified, effectively guarantee automobile-used urea's quality.
The present application may be further configured in a preferred example to: the second ultrafiltration filter core is arranged on the second feed delivery pipe, and the connection position of the second feed delivery pipe and the second feed delivery pipe is positioned between the second ultrafiltration filter core and the second feed delivery pipe; the third communicating pipe is provided with a sixteenth control valve; one end of the secondary filtering pipe is communicated with the intermediate liquid material storage tank, the other end of the secondary filtering pipe is communicated with the inspection pipe, and the connection position of the secondary filtering pipe and the inspection pipe is positioned between the seventh control valve and the sixth control valve; a purification mechanism for adsorbing metal ions is arranged in the intermediate liquid storage tank; the purification mechanism includes the cavity shell of fixed connection in middle liquid material storage tank inner wall and a plurality of metal ion absorption spare of filling in the cavity shell, and metal ion absorption spare includes outer bag layer and fills in the polymer chelant layer on outer bag layer.
By adopting the technical scheme, the detected unqualified materials enter the intermediate liquid material storage tank, and are filtered and purified again through the third ultrafiltration filter core of the secondary filter pipe until the filtrate meets the detection standard, so that the integral continuous production of the vehicle urea is ensured; meanwhile, the back washing mechanism can be used for independently washing the third ultrafiltration filter element, so that the filtering effect of the third ultrafiltration filter element is ensured, the washing time of the third ultrafiltration filter element is shortened, and the production efficiency of the automobile urea is improved.
The present application may be further configured in a preferred example to: the filter device is communicated with a back washing mechanism, the back washing mechanism comprises a washing water storage tank communicated with a water outlet pipe of the deionized water machine, a first booster pump communicated with the washing water storage tank, a washing water pipe communicated with the first booster pump, a washing water recovery tank communicated with the filter device, a first washing water branch pipe communicated with the first delivery pipe and positioned between the second control valve and the micro-filtration core, and a second washing water branch pipe communicated with the second delivery pipe and positioned between the third control valve and the first ultra-filtration core, a third flushing water branch pipe which is communicated with the third conveying pipeline and is positioned between the sixth control valve and the second ultrafiltration filter element at the communication position, a first collecting pipe which is communicated with the joint of the first conveying pipeline and the second conveying pipeline, and a second collecting pipe which is communicated with the joint of the third conveying pipeline and the inspection pipe, wherein the first flushing water branch pipe is communicated with a ninth control valve; the second washing water branch pipe is communicated with a tenth control valve; the third washing water branch pipe is communicated with an eleventh control valve; the third flushing water branch pipe is communicated with the secondary filtering pipe; the first washing water branch pipe, the second washing water branch pipe and the third washing water branch pipe are all communicated with a washing water pipe; the first collecting pipe and the second collecting pipe are communicated with a flushing water recovery tank; the flushing water recovery tank is communicated with the water storage device.
Through adopting above-mentioned technical scheme, utilize first booster pump with the deionized water back flush microfiltration filter core in the washing water storage case, first ultrafiltration filter core, second ultrafiltration filter core and third ultrafiltration filter core, the quick washing microfiltration filter core that plays, first ultrafiltration filter core, second ultrafiltration filter core and third ultrafiltration filter core, the cleaning time to microfiltration filter core, first ultrafiltration filter core, second ultrafiltration filter core and third ultrafiltration filter core has been practiced thrift, thereby the production efficiency of automobile-used urea has been promoted.
The present application may be further configured in a preferred example to: the step 3: introducing nitrogen at the temperature of 40-60 ℃ into the batching device, and simultaneously starting a stirring mechanism to stir until air in the stirring kettle is exhausted; and 5: adding the pretreated urea into the batching device at a constant adding speed in the step 2, continuously stirring while adding the pretreated urea, wherein the stirring speed is in inverse proportion to the concentration of the prepared solution, continuously introducing nitrogen at the temperature of 60 ℃, and maintaining the temperature of the prepared solution at 60 +/-2 ℃; step 6: and (3) after the addition of the pretreated urea is finished, stopping stirring, reducing the nitrogen introduction amount, wherein the nitrogen introduction amount is one fourth of the nitrogen introduction amount in the step (5), cooling the prepared solution to 4 ℃, and filtering to obtain a first purified material.
By adopting the technical scheme, the stirring mechanism is started simultaneously in the step 3 for stirring so as to accelerate the removal of air in the stirring kettle and remove dust adhered to the surface layer of the stirring mechanism, thereby further ensuring the quality of the pretreated urea; in the step 5, the stirring rotating speed is in inverse proportion to the concentration of the prepared liquid, so that the problem of crystallization caused by stirring along with overlarge concentration of the prepared liquid is avoided, and the preparation efficiency is ensured; and 6, stopping stirring and reducing the nitrogen introduction amount, wherein the introduction amount is one fourth of the nitrogen introduction amount in the step 5 so as to ensure that the biuret can be crystallized and separated out, remove the biuret in the prepared urea and ensure the quality of the first purified material.
To sum up, the application comprises the following beneficial technical effects:
1. this application carries out the preliminary treatment to automobile-used urea before carrying out automobile-used urea earlier and prepares, effectively gets rid of the impurity ion on raw materials urea granule surface, reduces the degree of difficulty of purification workshop section to reduction in production cost's advantage.
2. Through urea preprocessing machine and air supply for the air heater of nitrogen gas, this application reduces impurity and sneaks into the automobile-used urea of preparation in from the automobile-used impurity source in the urea, promotes the quality of preparing automobile-used urea, reduces and filters purification workshop section equipment load, and the going on of guarantee serialization production improves automobile-used urea production efficiency.
3. Need not to return the dosing unit with the raw materials and complete passing through filter equipment again when refiltering in this application, only must let in refiltering unit with detecting unqualified raw materials and purify again, guaranteed the serialization production of automobile-used urea, promote automobile-used urea's production efficiency.
Drawings
FIG. 1 is a schematic overall structure of the present application;
FIG. 2 is a schematic diagram of the urea pretreatment mechanism of the present application;
FIG. 3 is a schematic diagram of the filter, refilter, and backwash mechanism of the present application;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
FIG. 5 is a schematic of the structure of the detection device;
FIG. 6 is a schematic structural view of a water storage device;
fig. 7 is a schematic structural view of the purifying mechanism.
In the figure, 1, a deionized water machine; 10. a water storage device; 101. a water storage tank; 102. a water recovery pipe; 103. a tap water inlet pipe; 104. a first polypropylene microfiltration folding filter element; 105. a second polypropylene microfiltration folded filter element; 11. a dosing device; 110. a stabilizing base; 111. stirring the mixture in a kettle; 112. a jacket layer; 113. a urea feed pipe; 114. a metering tank; 115. emptying the pipe; 12. a urea pretreatment mechanism; 120. a housing; 121. a pretreatment tank; 1211. a discharge pipe; 122. lifting the frame body; 123. a stirrer; 124. a discharge pipeline; 125. a screw conveyor; 126. a urea inlet pipe; 127. an exhaust pipe; 128. a raw material urea addition tank; 129. a speed regulating valve; 13. a stirring mechanism; 131. a hollow rotating rod; 1311. a first air dispersing hole; 132. a hollow stirring rod; 1321. a second air dispersing hole; 1322. an air inlet groove; 1323. an air duct; 133. a driven gear; 134. a motor; 135. a driving gear; 14. an air heater; 2. a filtration device; 20. a detection device; 200. a re-filtering device; 201. a density meter; 202. an alkalinity tester; 203. a refractivity tester; 204. a metal ion analyzer; 205. a centralized display screen; 206. an intermediate liquid material storage tank; 207. a secondary filter tube; 208. a third ultrafiltration filter element; 209. a third communicating pipe; 2091. a sixteenth control valve; 21. a first feed delivery pipe; 22. micro-filtration filter element; 23. a second delivery pipe; 24. a first ultrafiltration filter element; 25. a third delivery pipe; 26. a second ultrafiltration filter element; 27. an inspection tube; 28. a check liquid outlet pipe; 281. a middle storage tank; 29. a product storage tank; 3. a first control valve; 31. a second control valve; 32. a third control valve; 33. a fourth control valve; 34. a fifth control valve; 35. a sixth control valve; 36. a seventh control valve; 37. an eighth control valve; 4. a second booster pump; 41. a front feed delivery pipe; 42. a transparent viewing tube; 43. a first pressure gauge; 5. a first communication pipe; 51. a fourteenth control valve; 50. a second communicating pipe; 501. a fifteenth control valve; 7. a backwashing mechanism; 71. a wash water tank; 72. a first booster pump; 73. flushing the water pipe; 74. a rinse water recovery tank; 75. a first washing water branch pipe; 751. a ninth control valve; 76. a second flushing water branch pipe; 761. a tenth control valve; 77. a third rinsing water branch pipe; 771. an eleventh control valve; 78. a first collection tube; 781. a twelfth control valve; 79. a second collection tube; 791. a thirteenth control valve; 8. a purification mechanism; 81. a hollow housing; 811. water permeable holes; 82. a metal ion absorber; 821. an upper metal ion absorber; 822. a medium metal ion absorber; 823. a lower metal ion absorber; 83. an outer bag layer; 84. a polymeric chelator layer; 9. an ultrasonic generator.
Detailed Description
The present application is described in further detail below with reference to figures 1-7.
Example one
Referring to fig. 1, the equipment required for implementing the urea production process for the vehicle disclosed by the application comprises a deionized water machine 1, wherein a water inlet of the deionized water machine 1 is communicated with a water storage device 10, and a water outlet of the deionized water machine 1 is communicated with a dosing device 11 for preparing urea for the vehicle; the dosing device 11 is communicated with a filtering device 2 for purifying the vehicle urea; the filtering device 2 is communicated with a detection device 20 and a re-filtering device 200 for filtering and detecting unqualified automobile urea along the liquid flowing direction; the filtering device 2 is communicated with a product storage tank 29; the filtering device 2 is communicated with a back washing mechanism 7 communicated with the water storage device 10.
Referring to fig. 2, the batching device 11 includes a stirring tank 111 communicated with the water outlet of the deionized water machine 1, and a conductivity meter is installed on a pipeline communicating the deionized water machine 1 and the stirring tank 111 for ensuring the quality of the deionized water, and is used for detecting the conductivity of the deionized water. A discharge pipe on the bottom wall of the stirring kettle 111 is provided with a polypropylene microfiltration folding filter element for filtering crystallized biuret; the bottom of the stirring kettle 111 is fixedly connected with a stable base 110; stirred tank 111 outer wall is formed with the jacket layer 112 that is used for controlling stirred tank 111 interior liquid material temperature, and the temperature when the automobile-used urea of accessible control joining heat transfer medium is prepared, and this application heats the automobile-used urea of preparing with low pressure steam in the preparation process, and the temperature control is at 60 ℃ when joining in marriage, and the urea of being convenient for is dissolved. The top of the stirring kettle 111 is fixedly communicated with a urea feeding pipe 113 used for adding quantitative urea, in order to ensure urea addition accuracy, the urea feeding pipe 113 is communicated with a metering tank 114, and the urea feeding pipe 113 is provided with an electromagnetic valve for quantifying urea. The metering tank 114 is fixedly connected with a urea pretreatment mechanism 12, and the purpose of the urea pretreatment mechanism 12 is to remove dust on urea and moisture contained in the urea, ensure the quality of the urea for a preparation vehicle and reduce the load of the filtering device 2. The top of the stirring kettle 111 is communicated with an emptying pipe 115, and the stirring kettle 111 is provided with a stirring mechanism 13 for stirring liquid materials; the stirring mechanism 13 is communicated with an air heater 14 for performing compensation heating on the liquid material, and the air heater 14 can also play a role in enhancing stirring.
Referring to fig. 2, the stirring mechanism 13 includes a hollow rotating rod 131 rotatably connected to the stirring vessel 111, and a plurality of first air-diffusing holes 1311 are formed in the circumference of the hollow rotating rod 131; the hollow rotating rod 131 is circumferentially and threadedly communicated with a plurality of hollow stirring rods 132, and a plurality of second air-dispersing holes 1321 are formed in the circumferential direction of the hollow stirring rods 132; the hollow stirring rod 132 is positioned in the stirring kettle 111; a driven gear 133 positioned on the outer wall of the stirring kettle 111 is fixedly connected to the circumferential direction of the rod end of the hollow rotating rod 131, a motor 134 for driving the hollow rotating rod 131 to rotate is fixedly connected to the top of the stirring kettle 111, and an output shaft of the motor 134 is fixedly connected with a driving gear 135 meshed with the driven gear 133; the end of the hollow rotating rod 131, which is positioned outside the stirring kettle 111, is coaxially provided with an air inlet slot 1322 communicated with the inside of the hollow stirring rod 132; air inlet tank 1322 internal rotation and sealing connection have air duct 1323, and air duct 1323 and air heater 14 intercommunication, air heater 14's air supply are nitrogen gas, before stirred tank 111 feeding, let in the nitrogen gas of heating earlier, arrange inside air to the greatest extent, can effectively reduce because of the impurity that has in the air dissolves the filtration degree of difficulty that leads to in the automobile-used urea of preparation, promote automobile-used urea production efficiency.
Referring to fig. 2, the urea pretreating mechanism 12 includes a housing 120, and a lifting frame 122 is fixedly connected to the bottom of the housing 120, so as to lift the urea pretreating mechanism 12 to the upper part of the metering tank 114; a pretreatment tank 121 is fixedly connected in the housing 120, a stirrer 123 for stirring urea is arranged in the pretreatment tank 121, and the stirrer 123 has the same structure as the stirring mechanism 13. The pretreatment tank 121 is fixedly communicated with a urea inlet pipe 126, and the top of the pretreatment tank 121 is fixedly communicated with an exhaust pipe 127; a raw material urea adding tank 128 is fixedly communicated with a urea inlet pipe 126 at the top of the pretreatment tank 121, a speed regulating valve 129 for controlling the adding speed of the raw material urea is installed on a pipeline between the raw material urea adding tank 128 and the pretreatment tank 121, and the speed regulating valve 129 is an electromagnetic valve. A discharge pipeline 124 positioned below the pretreatment tank 121 is fixedly connected in the shell 120; a spiral conveyor 125 for conveying urea is rotatably connected in the discharge pipeline 124, and the discharge pipeline 124 is communicated with the metering tank 114; the bottom of the pretreatment tank 121 is funnel-shaped, and the bottom of the pretreatment tank 121 is communicated with a discharge pipe 1211; an outlet pipe 1211 communicates with the outlet pipe 124 and is located above the outlet pipe 124. The outer wall of the shell 120 is fixedly connected with an ultrasonic generator 9 communicated with the pretreatment tank 121, and the ultrasonic generator 9 is positioned on one side of the lower part of the pretreatment tank 121.
Referring to fig. 3, the filtering device 2 includes a first material conveying pipe 21 communicated with the bottom of the stirring kettle 111, a microfiltration filter element 22 is sealed in the first material conveying pipe 21 by screw thread, a first control valve 3 and a second control valve 31 are sequentially and fixedly communicated with the first material conveying pipe 21 along the material flowing direction, and the microfiltration filter element 22 is located between the first control valve 3 and the second control valve 31.
Referring to fig. 3, the first feed delivery pipe 21 is communicated with a second feed delivery pipe 23, the second feed delivery pipe 23 is sealed with a first ultrafiltration filter element 24 in a threaded manner, the second feed delivery pipe 23 is sequentially and fixedly communicated with a third control valve 32 and a fourth control valve 33 along the material flow direction, and the first ultrafiltration filter element 24 is positioned between the third control valve 32 and the fourth control valve 33.
Referring to fig. 3, the second feeding pipe 23 is communicated with a third feeding pipe 25, a second ultrafiltration filter element 26 is sealed in the third feeding pipe 25 through threads, a fifth control valve 34 and a sixth control valve 35 are sequentially and fixedly communicated with the third feeding pipe 25 along the material flowing direction, and the second ultrafiltration filter element 26 is positioned between the fifth control valve 34 and the sixth control valve 35.
Referring to fig. 3, referring to fig. 1, the third material conveying pipe 25 is communicated with an inspection pipe 27, the inspection pipe 27 is communicated with a product storage tank 29, one end of the inspection pipe 27 is communicated with the third material conveying pipe 25, and the other end is communicated with the product storage tank 29; an inspection liquid outlet pipe 28 is communicated with the circumference of the inspection pipe 27; a seventh control valve 36 and an eighth control valve 37 are fixedly communicated with the inspection pipe 27 in sequence along the material flowing direction, and the inspection liquid outlet pipe 28 is positioned between the seventh control valve 36 and the eighth control valve 37. For maintenance management, the first feed conveyor 21, the second feed conveyor 23, the third feed conveyor 25 and the inspection tube 27 may be fixed by a frame.
Referring to fig. 3, a first communicating pipe 5 is communicated between the first feeding pipe 21 and the second feeding pipe 23, and a fourteenth control valve 51 is communicated with the first communicating pipe 5; the joint of the first communicating pipe 5 and the first material conveying pipe 21 is positioned between the first control valve 3 and the microfiltration filter element 22, and the joint of the first communicating pipe 5 and the second material conveying pipe 23 is positioned between the fourth control valve 33 and the first ultrafiltration filter element 24. A second communicating pipe 50 is communicated between the third conveying pipeline 25 and the inspection pipe 27, and a fifteenth control valve 501 is communicated on the second communicating pipe 50; the joint of the second communicating pipe 50 and the third conveying pipe 25 is positioned between the fifth control valve 34 and the second ultrafiltration filter element 26, and the joint of the second communicating pipe 50 and the inspection pipe 27 is positioned between the eighth control valve 37 and the inspection liquid outlet pipe 28.
Referring to fig. 3, in order to ensure the hydraulic pressure of the filtering device 2 and obtain a better filtering effect, a second booster pump 4 is communicated between the stirring kettle 111 and the first material conveying pipe 21; a front material conveying pipe 41 is communicated between the second booster pump 4 and the stirring kettle 111; a transparent observation pipe 42 is communicated between the second booster pump 4 and the first material conveying pipe 21; the transparent observation tube 42 is fixedly communicated with a first pressure gauge 43.
Referring to fig. 3 and fig. 5, the detecting device 20 includes a density meter 201, an alkalinity meter 202, a refractivity meter 203 and a metal ion analyzer 204 which are sequentially communicated with the inspection tube 27 along the flowing direction of the liquid material, wherein a density display connected with the signal end of the density meter 201 through a lead, an alkalinity display connected with the alkalinity meter 202 through a lead, a refractivity display connected with the refractivity meter 203 through a lead and a metal ion parameter display connected with the metal ion analyzer 204 through a lead are connected with each other to form a centralized display screen 205.
Referring to fig. 3 in conjunction with fig. 4, the refilter apparatus 200 includes an intermediate liquid storage tank 206 in communication with the inspection liquid outlet pipe 28, the intermediate liquid storage tank 206 being in communication with a refilter pipe 207; the secondary filtering pipe 207 is provided with a front electromagnetic valve, a third communicating pipe 209 communicated with the third conveying pipe 25, a third ultrafiltration filter element 208 for filtration and purification and a rear electromagnetic valve along the flowing direction of the liquid material; the joint of the third communicating pipe 209 and the third conveying pipeline 25 is positioned between the second ultrafiltration filter element 26 and the second communicating pipe 50; the sixteenth control valve 2091 is installed on the third communication pipe 209; one end of the refiltering pipe 207 is communicated with the intermediate liquid storage tank 206 and the other end is communicated with the inspection pipe 27, and the connection position of the refiltering pipe 207 and the inspection pipe 27 is positioned between the seventh control valve 36 and the sixth control valve 35. In connection with fig. 7; a purification mechanism 8 for adsorbing metal ions is arranged in the intermediate liquid storage tank 206; the purification mechanism 8 comprises a hollow shell 81 fixedly connected with the inner wall of the intermediate liquid storage tank 206, and the upper surface and the lower surface of the hollow shell 81 are provided with water permeable holes 811 communicated with the inside; the hollow shell 81 is filled with three metal ion absorption pieces 82, the metal ion absorption pieces 82 are divided into an upper metal ion absorption piece 821, a middle metal ion absorption piece 822 and a lower metal ion absorption piece 823, the structures of the three are the same, the metal ion absorption pieces 82 comprise an outer bag layer 83, and the outer bag layer 83 is prepared from hollow fibers; the outer bag layer 83 is filled with a polymer chelating agent layer 84, wherein the polymer chelating agent layer 84 of the upper metal ion absorbing member 821 and the lower metal ion absorbing member 823 is a crown ether type chelating resin for absorbing alkali metal ions, and the polymer chelating agent layer 84 of the middle metal ion absorbing member 822 is a polyamino type chelating resin for absorbing heavy metal ions.
Referring to fig. 3, the backwashing mechanism 7 includes a washing water tank 71 communicated with the water outlet pipe of the deionized water machine 1, the washing water tank 71 is communicated with a first booster pump 72, the first booster pump 72 is communicated with a washing water pipe 73, the filtering device 2 is communicated with a washing water recovery tank 74 for recovering the backwashing water body, one end of the washing water pipe 73 is communicated with the first booster pump 72, the other end is communicated with the filtering device 2, and the washing water recovery tank 74 is communicated with the water storage device 10; the intermediate liquid storage tank 206 is communicated with the flushing water recovery tank 74, and when the vehicle urea is unqualified in distribution detection and qualified products cannot be obtained through refiltering, the intermediate liquid storage tank 206 is pumped into the flushing water recovery tank 74.
Referring to fig. 3, the back flushing mechanism 7 further comprises a first flushing water branch pipe 75 communicated with the first material conveying pipe 21 and positioned between the second control valve 31 and the microfiltration filter 22 at the communication position, and the first flushing water branch pipe 75 is communicated with a ninth control valve 751; the second conveying pipeline 23 is communicated with a second flushing water branch pipe 76, and the second flushing water branch pipe 76 is communicated with a tenth control valve 761; the communication position of the second flushing water branch pipe 76 and the second material conveying pipe 23 is positioned between the third control valve 32 and the first ultrafiltration filter element 24; the third conveying pipeline 25 is communicated with a third flushing water branch pipe 77, and the third flushing water branch pipe 77 is communicated with an eleventh control valve 771; the communication position of the third washing water branch pipe 77 and the third feed pipe 25 is located between the sixth control valve 35 and the second ultrafiltration filter cartridge 26, and the first washing water branch pipe 75, the second washing water branch pipe 76 and the third washing water branch pipe 77 are all communicated with the washing water pipe 73. The secondary filter pipe 207 is communicated with the third washing water branch pipe 77 through a pipeline, and the pipeline is provided with an electromagnetic valve; the communication between the third ultrafiltration filter element 208 and the solenoid valve downstream of the refilter tube 207.
Referring to fig. 3, a first collecting pipe 78 is communicated with the joint of the first conveying pipeline 21 and the second conveying pipeline 23 through a three-way pipe, and a twelfth control valve 781 is communicated with the first collecting pipe 78; the joint of the third conveying pipeline 25 and the inspection pipe 27 is communicated with a second collecting pipe 79 through a three-way pipe, and the second collecting pipe 79 is communicated with a thirteenth control valve 791; the first collecting pipe 78 and the second collecting pipe 79 are both communicated with the washing water recovery tank 74. The first control valve 3, the second control valve 31, the third control valve 32, the fourth control valve 33, the fifth control valve 34, the sixth control valve 35, the seventh control valve 36, the eighth control valve 37, the ninth control valve 751, the tenth control valve 761, the eleventh control valve 771, the twelfth control valve 781, the thirteenth control valve 791, the fourteenth control valve 51, the fifteenth control valve 501, and the sixteenth control valve 2091 are all solenoid valves.
Referring to fig. 5, in conjunction with fig. 2, the water storage device 10 includes a water storage tank 101, the water storage tank 101 is communicated with a recovery water pipe 102, and a second polypropylene microfiltration folded filter element 105 is installed on the recovery water pipe 102; the water storage tank 101 is communicated with a tap water inlet pipe 103, and a first polypropylene microfiltration folding filter element 104 is arranged on the tap water inlet pipe 103.
The application relates to a production process of urea for vehicles, which comprises the following steps: the method comprises the following steps:
step 1: pumping the recovered water of the flushing water recovery tank 74 into a water storage tank 101 through a recovery water pipe 102, filtering the recovered water by a second polypropylene microfiltration folded filter element 105 when the recovered water is pumped into the water storage tank 101, simultaneously pumping the water of a tap water inlet pipe 103 into the water storage tank 101 through a tap water inlet pipe 103, filtering the water by a first polypropylene microfiltration folded filter element 104 when the recovered water is pumped into the water storage tank 101, detecting the resistivity of deionized water through a conductivity meter, and inputting the deionized water into the water storage tank 101 when the resistivity of the deionized water is controlled to be 19M omega CM to obtain standby water storage;
step 2: step 1 is carried out, raw material urea is pretreated through a urea pretreatment mechanism 12, the raw material urea in a raw material urea adding tank 128 is added into a pretreatment tank 121 at the speed of 10-15kg/min under the control of a speed regulating valve 129, a stirrer 123 is started to continuously stir the raw material urea added into the pretreatment tank 121, an air heater 14 works simultaneously, 4s of nitrogen with the temperature of 40 ℃ is introduced into the pretreatment tank 121 every 10s, the nitrogen is introduced, and an ultrasonic generator 9 is started to emit ultrasonic waves with the frequency of 25kHZ at the same time, so that the pretreated urea is obtained;
and step 3: introducing nitrogen gas with the temperature of 45 ℃ into the stirring kettle 111, continuously introducing for 10min, and exhausting the air in the stirring kettle 2;
and 4, step 4: adding the deionized water prepared in the step 1 into a stirring kettle 111, introducing low-pressure steam into a jacket layer 112, continuously introducing heating nitrogen and stirring, and heating the deionized water to 60 ℃;
and 5: adding the prepared pretreated urea in the step 2 into a stirring kettle 111 at a speed of 12.5kg/min, adding the pretreated urea, starting a stirring mechanism 13 for continuous stirring, starting an air heater 14 for continuous introduction of nitrogen at the temperature of 60 ℃, and maintaining the temperature of the prepared liquid within the range of 60 +/-2 ℃;
step 6: stopping introducing low-pressure steam into the jacket layer 112, instead introducing cooling water, cooling the prepared solution to 4 ℃, maintaining the temperature of the prepared solution at 4 ℃ in a water body at 4 ℃ in the jacket layer 112, crystallizing biuret in the prepared solution, flowing through a polypropylene microfiltration folding filter element on a discharge pipe on the bottom wall of the stirring kettle 111, and filtering the crystallized biuret to obtain a first purified material;
and 7: sequentially passing the vehicle urea to be purified in the step 6 through a microfiltration filter core 22, a first ultrafiltration filter core 24 and a second ultrafiltration filter core 26, and removing impurities in the vehicle urea to obtain a liquid to be detected;
and 8: the liquid to be detected in the step 7 is detected by a density tester 201, an alkalinity tester 202, a refractivity tester 203 and a metal ion analyzer 204, and if the liquid is qualified, the liquid flows to a product storage tank 29 to be stored for later use;
and step 9: if the detection is unqualified, closing the eighth control valve 37 and opening the eighth control valve to enable the unqualified materials to flow to the intermediate liquid storage tank 206, pumping the materials in the intermediate liquid storage tank 206 to the refilter pipe 207, performing refiltering under the action of the third ultrafiltration filter element 208, and enabling the filtered materials to flow to the density determinator 201, the alkalinity determinator 202, the refractivity determinator 203 and the metal ion analyzer 204 for detection again;
10, repeating the operation of the step 9 until the material is detected to be qualified, and flowing to a product storage tank 29 for storage and standby.
The production equipment for implementing the automotive urea production process in the application can realize self-cleaning:
step 1: closing the first control valve 3, the second control valve 31 and the fourth control valve 33, opening a twelfth control valve 781, a fourteenth control valve 51 and a ninth control valve 751, opening the first booster pump 72, pumping deionized water in the cleaning water storage tank 71 to the first delivery pipe 21, performing back flushing on the microfiltration filter element 22, allowing the cleaning water to flow to the first collecting pipe 78 through the first ultrafiltration filter element 24, recovering the cleaning water in the cleaning water recovery tank 74, and completing cleaning of the microfiltration filter element 22;
step 2: closing the third control valve 32 and the seventh control valve 36, opening the fourth control valve 33, the fifth control valve 34, the sixth control valve 35, the tenth control valve 761 and the thirteenth control valve 791, opening the first booster pump 72, pumping the deionized water in the cleaning water storage tank 71 to the second delivery pipe 23, backwashing the first ultrafiltration filter element 24, flowing the cleaning liquid to the third delivery pipe 25, flowing the cleaning liquid through the second ultrafiltration filter element 26 to the second collection pipe 79, recovering the cleaning liquid in the cleaning water recovery tank 74, and completing cleaning of the first ultrafiltration filter element 24;
and step 3: closing the valves of the fifth control valve 34, the sixth control valve 35, the eighth control valve 37, the inspection liquid outlet pipe 28 and the solenoid valve of the refiltering pipe 207, opening the fifteenth control valve 501, the seventh control valve 36, the thirteenth control valve 791 and the eleventh control valve 771, opening the first booster pump 72, pumping the deionized water in the cleaning water tank 71 to the third delivery pipe 25, backwashing the second ultrafiltration filter element 26, flowing the cleaning liquid to the inspection pipe 27, flowing to the second collection pipe 79, and recovering to the cleaning water recovery tank 74, thereby completing the cleaning of the second ultrafiltration filter element 26.
And 4, step 4: the valve on the inspection liquid outlet pipe 28 and the solenoid valve on the refilter pipe 207, which is located at the downstream side in the material flow direction, are closed, the solenoid valve on the pipeline connecting the refilter pipe 207 and the third rinse water branch pipe 77, and the solenoid valve on the refilter pipe 207, which is located at the upstream side in the material flow direction, are opened, the first booster pump 72 is opened, deionized water in the rinse water tank 71 is pumped to the refilter pipe 207, the third ultrafiltration filter element 208 is backwashed, and the rinse liquid flows to the intermediate liquid tank 206 and then to the rinse water recovery tank 74, thereby completing the cleaning of the third ultrafiltration filter element 208.
Example two
The difference between the second embodiment and the first embodiment is that: in the pretreatment of the raw material, only stirring is performed, and nitrogen gas is not introduced into the pretreatment tank 121.
EXAMPLE III
The difference between the third embodiment and the first embodiment is that: in the pretreatment of the raw material, only nitrogen gas was introduced into the pretreatment tank 121 without stirring.
Example four
The difference between the fourth embodiment and the first embodiment is that: the urea pretreatment mechanism is not provided with an ultrasonic generator 9, and during pretreatment of raw materials, the urea in the pretreatment tank 121 is not subjected to ultrasonic treatment.
Comparative example 1
The difference between the first comparative example and the first example is that: the urea pretreatment mechanism 12 is not arranged, and when the vehicle urea is produced, raw materials are not pretreated.
The detection method comprises the following steps: ten-pot preparation liquids were prepared according to the processes in examples one to four and comparative example one, and the liquid materials prepared in the re-stirring pot 111 in examples one to four and comparative example one were collected respectively and tested by a density tester 201, an alkalinity tester 202, a refractivity tester 203 and a metal ion analyzer 204, and the average values of the tests were prepared as table 1.
Table 1 shows the parameters of the liquid materials collected in examples one to four and comparative example one
As can be seen from Table 1, during pretreatment, the urea is added into the pretreatment tank 121 at a speed of 10-15kg/min, the stirrer 123 is started to continuously stir the raw material urea added into the pretreatment tank 121, the air heater 14 is operated, 4s of nitrogen with the temperature of 40 ℃ is introduced into the pretreatment tank 121 every 10s, the ultrasonic generator 9 is started to emit ultrasonic waves with the frequency of 25kHZ at the same time of introducing the nitrogen, the pretreated urea with higher purity can be obtained, the difficulty of section purification can be reduced, and the production efficiency of the urea for vehicles can be improved.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (4)
1. A production process of urea for vehicles comprises the following steps:
step 1: preparing deionized water by using a deionized water machine (1), wherein the resistivity of the deionized water is controlled to be 19-23M omega.CM;
step 2: step 1 is carried out, raw material urea is pretreated through a urea pretreatment mechanism (12), the raw material urea in a raw material urea adding tank (128) is added into a pretreatment tank (121) at the rate of 10-15kg/min under the control of a speed regulating valve (129), the raw material urea added into the pretreatment tank (121) is continuously stirred, 4s of nitrogen with the temperature of 20-45 ℃ is introduced into the pretreatment tank (121) every 10s, the nitrogen is introduced, and an ultrasonic generator (9) is started at the same time, so that the pretreatment urea is obtained;
and step 3: introducing nitrogen at the temperature of 40-60 ℃ into the batching device (11), and simultaneously starting the stirring mechanism (13) to stir until air in the stirring kettle (111) is exhausted;
and 4, step 4: adding the deionized water prepared in the step 1 into a batching device (11), and heating the deionized water to 55-65 ℃;
and 5: adding the pre-treated urea into the batching device (11) at a constant adding speed in the step 2, continuously stirring while adding the pre-treated urea, wherein the stirring speed is in inverse proportion to the concentration of the prepared solution, continuously introducing nitrogen at the temperature of 60 ℃, and maintaining the temperature of the prepared solution at 60 +/-2 ℃;
step 6: after the addition of the pretreated urea is finished, stopping stirring, reducing the nitrogen introduction amount, wherein the nitrogen introduction amount is one fourth of the nitrogen introduction amount in the step 5, cooling the prepared solution to 4 ℃, and filtering to obtain a first purified material;
and 7: conveying the first purified material in the step 6 to a filtering device (2) to obtain a liquid to be detected;
and 8: if the liquid to be detected in the step 7 is qualified, storing for later use; if the detection is unqualified, purifying the liquid to be detected to a secondary filtering device (200), and storing the purified liquid for later use after the purification is qualified; dosing unit (11) including stirred tank (111) with deionized water machine (1) intercommunication, integrated into one piece is used for controlling jacketed layer (112) of stirred tank (111) interior liquid material temperature in stirred tank (111) outer wall, communicate in urea inlet pipe (113) at stirred tank (111) top, communicate in metering tank (114) of urea inlet pipe (113), communicate in urea pretreatment mechanism (12) of metering tank (114), communicate in evacuation pipe (115) at stirred tank (111) top, set up in stirred tank (111) and be used for rabbling mechanism (13) of liquid material and communicate in air heater (14) of rabbling mechanism (13), rabbling mechanism (13) are including moving hollow dwang (131) of connecting in stirred tank (111), many are communicated in hollow dwang (131) circumference cavity puddler (132), fixed connection is in driven gear (133) of hollow dwang (131) rod end circumference, The stirring device comprises a motor (134) fixedly connected to the top of the stirring kettle (111), and a driving gear (135) fixedly connected to an output shaft of the motor (134) and capable of being meshed with a driven gear (133), wherein a hollow stirring rod (132) is arranged in the stirring kettle (111); a plurality of first air dispersing holes (1311) are formed in the circumferential direction of the hollow rotating rod (131); a plurality of second air dispersing holes (1321) are formed in the circumferential direction of the hollow stirring rod (132); the end of the hollow rotating rod (131) positioned outside the stirring kettle (111) is coaxially provided with an air inlet groove (1322) communicated with the inside of the hollow stirring rod (132); the air inlet groove (1322) rotates and is hermetically connected with an air duct (1323), and the air duct (1323) is communicated with an air heater (14); the urea pretreatment mechanism (12) comprises a shell (120), a lifting frame body (122) fixedly connected to the bottom of the shell (120), a pretreatment tank (121) fixedly connected to the shell (120), a stirrer (123) arranged in the pretreatment tank (121) and used for stirring urea, a raw urea adding tank (128) communicated with the top of the pretreatment tank (121), a speed regulating valve (129) communicated with the raw urea adding tank (128) and the pretreatment tank (121) and used for controlling the adding speed of the raw urea, a discharge pipeline (124) fixedly connected to the shell (120) and positioned below the pretreatment tank (121), and a spiral conveyor (125) rotatably connected to the discharge pipeline (124) and used for conveying urea, wherein the stirrer (123) is communicated with the air heater (14); the discharge pipeline (124) is communicated with the batching device (11); the bottom of the pretreatment tank (121) is funnel-shaped, and the bottom of the pretreatment tank (121) is communicated with a discharge pipe (1211); the discharge pipe (1211) is communicated with the discharge pipeline (124) and is positioned at the upper part of the discharge pipeline (124); the structure of the stirrer (123) is the same as that of the stirring mechanism (13); the urea pretreatment mechanism (12) further comprises an ultrasonic generator (9) arranged in the pretreatment tank (121).
2. The process for producing urea for vehicles according to claim 1, wherein: the filtering device (2) comprises a first conveying pipeline (21) communicated with the bottom of the stirring kettle (111), a microfiltration filter core (22) detachably connected with the first conveying pipeline (21), a second conveying pipeline (23) communicated with the first conveying pipeline (21), a first ultrafiltration filter core (24) detachably connected with the second conveying pipeline (23), a third conveying pipeline (25) communicated with the second conveying pipeline (23), a second ultrafiltration filter core (26) detachably connected with the third conveying pipeline (25), an inspection pipe (27) communicated with the third conveying pipeline (25), inspection liquid outlet pipes (28) communicated with the circumferential direction of the inspection pipe (27), a product storage tank (29) communicated with the inspection pipe (27), a first communicating pipe (5) communicated with the first conveying pipeline (21) and the second conveying pipeline (23) and a second communicating pipe (50) communicated with the third conveying pipeline (25) and the inspection pipe (27), one end of the inspection pipe (27) is communicated with the third conveying pipe (25) and the other end is communicated with the product storage tank (29); a first control valve (3) and a second control valve (31) are sequentially and fixedly communicated with the first conveying pipe (21) along the material flowing direction, and the microfiltration filter element (22) is positioned between the first control valve (3) and the second control valve (31); a third control valve (32) and a fourth control valve (33) are sequentially and fixedly communicated with the second conveying pipeline (23) along the material flowing direction, and the first ultrafiltration filter element (24) is positioned between the third control valve (32) and the fourth control valve (33); a fifth control valve (34) and a sixth control valve (35) are sequentially and fixedly communicated with the third conveying pipeline (25) along the material flowing direction, and the second ultrafiltration filter element (26) is positioned between the fifth control valve (34) and the sixth control valve (35); a seventh control valve (36) and an eighth control valve (37) are sequentially and fixedly communicated with the inspection pipe (27) along the material flowing direction, and an inspection liquid outlet pipe (28) is positioned between the seventh control valve (36) and the eighth control valve (37); the joint of the first communicating pipe (5) and the first conveying pipe (21) is positioned between the first control valve (3) and the microfiltration filter core (22), and the joint of the first communicating pipe (5) and the second conveying pipe (23) is positioned between the fourth control valve (33) and the first ultrafiltration filter core (24); the joint of the second communicating pipe (50) and the third conveying pipe (25) is positioned between the fifth control valve (34) and the second ultrafiltration filter element (26), and the joint of the second communicating pipe (50) and the inspection pipe (27) is positioned between the eighth control valve (37) and the inspection liquid outlet pipe (28).
3. The process for producing urea for vehicles according to claim 2, wherein: the refilter device (200) comprises an intermediate liquid storage tank (206) communicated with the inspection liquid outlet pipe (28), a refilter pipe (207) communicated with the intermediate liquid storage tank (206), a third communicating pipe (209) arranged on the refilter pipe (207) along the liquid flowing direction, and a third ultrafiltration filter core (208), wherein the third communicating pipe (209) is communicated with the third conveying pipe (25), and the joint of the third communicating pipe (209) and the third conveying pipe (25) is positioned between the second ultrafiltration filter core (26) and the second communicating pipe (50); the third communicating pipe (209) is provided with a sixteenth control valve (2091); one end of the refilter pipe (207) is communicated with the intermediate liquid storage tank (206) and the other end is communicated with the inspection pipe (27), and the joint of the refilter pipe (207) and the inspection pipe (27) is positioned between the seventh control valve (36) and the sixth control valve (35); a purification mechanism (8) for adsorbing metal ions is arranged in the intermediate liquid storage tank (206); the purifying mechanism (8) comprises a hollow shell (81) fixedly connected to the inner wall of the intermediate liquid storage tank (206) and a plurality of metal ion absorbing pieces (82) filled in the hollow shell (81), wherein each metal ion absorbing piece (82) comprises an outer bag layer (83) and a polymer chelating agent layer (84) filled in the outer bag layer (83).
4. The process for producing urea for vehicles according to claim 3, wherein: a back washing mechanism (7) is communicated with the filtering device (2); the back washing mechanism (7) comprises a washing water storage tank (71) communicated with a water outlet pipe of the deionized water machine (1), a first booster pump (72) communicated with the washing water storage tank (71), a washing water pipe (73) communicated with the first booster pump (72), a washing water recovery tank (74) communicated with the filtering device (2), a first washing water branch pipe (75) communicated with the first conveying pipe (21) and positioned between the second control valve (31) and the micro-filtration core (22), a second washing water branch pipe (76) communicated with the second conveying pipe (23) and positioned between the third control valve (32) and the first ultra-filtration core (24), a third washing water branch pipe (77) communicated with the third conveying pipe (25) and positioned between the sixth control valve (35) and the second ultra-filtration core (26), a first collecting pipe (78) communicated with the joint of the first conveying pipe (21) and the second conveying pipe (23), A second collecting pipe (79) communicated with the joint of the third conveying pipe (25) and the checking pipe (27), and a ninth control valve (751) is communicated with the first washing water branch pipe (75); a tenth control valve (761) is communicated with the second washing water branch pipe (76); an eleventh control valve (771) is communicated with the third washing water branch pipe (77); a first washing water branch pipe (75), a second washing water branch pipe (76) and a third washing water branch pipe (77) are all communicated with the washing water pipe (73); the third flushing water branch pipe (77) is communicated with the refiltering pipe (207); the first collecting pipe (78) and the second collecting pipe (79) are communicated with the flushing water recovery tank (74); the washing water recovery tank (74) is communicated with the water storage device (10).
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| CN114524754A (en) * | 2022-02-28 | 2022-05-24 | 亿路洁(广州)环保股份有限公司 | Production process of urea for vehicles |
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| CN204185305U (en) * | 2014-09-29 | 2015-03-04 | 天津卡兰素环保科技有限公司 | A kind of urea for vehicle solution production environmental protection equipment |
| CN105582809B (en) * | 2014-10-21 | 2018-08-17 | 中国石油化工股份有限公司 | A kind of process units and application method of exhaust gas from diesel vehicle treatment fluid |
| CN104910048B (en) * | 2015-05-14 | 2017-03-15 | 湖南车瑞科技股份有限公司 | Urea for vehicle solution preparation system and the preparation method of urea for vehicle solution |
| CN205659687U (en) * | 2016-05-17 | 2016-10-26 | 山东新蓝环保科技有限公司 | Automobile -used urea filters purification device |
| KR101893188B1 (en) * | 2016-10-25 | 2018-08-29 | 주식회사 소울테크 | Method for producing aqueous urea and removing buiret and triuret from aqueous urea |
| CN206276241U (en) * | 2016-12-15 | 2017-06-27 | 青州百川水设备有限公司 | Automobile urea liquid process units |
| CN106823966A (en) * | 2017-02-08 | 2017-06-13 | 六安市智奇工业设计有限公司 | A kind of anti-oxidation chemical industry Raw material processing deployment device |
| CN208878376U (en) * | 2018-08-13 | 2019-05-21 | 中国华能集团有限公司 | A kind of device for preventing urea dissolving tank from crystallizing |
| CN209631032U (en) * | 2019-01-24 | 2019-11-15 | 金浦新材料股份有限公司 | A kind of integrated device of urea for vehicle solution |
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