CN111773925A - Automobile urea solution production system and preparation method thereof - Google Patents
Automobile urea solution production system and preparation method thereof Download PDFInfo
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- CN111773925A CN111773925A CN202010613991.6A CN202010613991A CN111773925A CN 111773925 A CN111773925 A CN 111773925A CN 202010613991 A CN202010613991 A CN 202010613991A CN 111773925 A CN111773925 A CN 111773925A
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- 239000004202 carbamide Substances 0.000 title claims abstract description 148
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 147
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 54
- 238000000926 separation method Methods 0.000 claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 28
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 19
- 229910021642 ultra pure water Inorganic materials 0.000 claims abstract description 17
- 239000012498 ultrapure water Substances 0.000 claims abstract description 17
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 6
- 238000001704 evaporation Methods 0.000 claims abstract description 5
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- 238000004868 gas analysis Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims 3
- 238000004891 communication Methods 0.000 claims 2
- 238000004458 analytical method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000007865 diluting Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000009924 canning Methods 0.000 abstract 2
- 239000000243 solution Substances 0.000 description 35
- 230000008901 benefit Effects 0.000 description 8
- 238000011049 filling Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention belongs to the field of urea industrial production, and particularly relates to a vehicle urea solution production system and a preparation method thereof, wherein 70-83% of urea solution in a urea solution tank from a flash evaporation tank of an existing urea device is directly conveyed to a stirring separation tank through a pump, the urea solution is rapidly stirred, about 0.55% of free ammonia in the urea solution is removed by nitrogen stripping, and gas phase micro-negative pressure equipment at the top of the stirring separation tank recovers gas to the urea device for washing and recovery. After stirring, air stripping and separation for 2 hours, adding ultrapure water which is obtained by processing desalted water calculated theoretically through delicate equipment, diluting to the urea concentration of 31.8-33.2%, stirring for half an hour uniformly, then circularly cooling by a circulating pump through a cooler to the normal temperature, sending to a finished product tank, and canning by a canning machine. The invention can directly utilize the existing urea production device to produce the vehicle urea solution meeting the requirements, optimizes the process flow and saves the construction cost.
Description
Technical Field
The invention belongs to the field of industrial production of urea, and particularly relates to a production system of a urea solution for a vehicle and a preparation method thereof.
Background
At present, most of domestic heavy trucks, buses and buses adopt SCR technical routes to meet the requirements of national emission standards, so that the vehicle urea solution required by an SCR system becomes a consumable equivalent to diesel oil, so that the vehicle urea has good prospect requirements, and for some companies with large urea capacity, deep processing and value-added urea are less, so that the actual development of vehicle liquid urea products is urgently needed. Many companies have high urea capacity and high sales pressure in special periods, but when road traffic control and market are in off-season, the production is threatened when the delivery is not timely, and the method for solving the problem is to increase the storage capacity and develop downstream products. However, increasing storage capacity is accompanied by increasing storage costs. It is not wise to increase reserves, as can be seen. It is the best choice to develop downstream products.
At present, the demand of domestic automobile urea is not completely released, large chemical enterprises do not produce the automobile urea, and market automobile urea suppliers are all small chemical enterprises, so that the automobile urea produced by the national chemical enterprises fills the production of the large chemical enterprises.
As the automobile urea is a 31.8-33.2% urea aqueous solution, the production flow of the automobile urea mainly comprises 3 stages of urea purification, water treatment and solution preparation.
The domestic automobile urea is mainly obtained by purifying granular industrial urea, and the main principle is as follows:
the purity of the urea can be greatly improved after every hydrolysis and crystallization, the urea can meet the standard requirement of the automobile urea by generally utilizing industrial first-grade urea for hydrolysis and crystallization once, and the output ratio is 1.5: 1, but the whole process is complex and is not beneficial to industrial production.
Disclosure of Invention
The invention aims to provide a vehicle urea solution production system, which can directly utilize the existing urea production device to produce the vehicle urea solution meeting the requirements, optimize the process flow and save the construction cost;
it is another object of the present invention to provide a simple process for the preparation of a urea solution for vehicles.
In order to achieve the purpose, the invention adopts the following technical scheme:
a urea solution production system for vehicles comprises a stirring and separating tank, a urea supply pipe network, a nitrogen pipe network, an ultrapure water pipe network and a product output pipe network, wherein the stirring and separating tank is provided with a raw material feeding hole, an ultrapure water inlet, an electric stirrer mounting port, a gas recovery port, a nitrogen inlet and a product circulation inlet; one end of the urea supply pipe network is communicated with the stirring separation tank through a raw material feeding hole, the other end of the urea supply pipe network is externally connected with a flash tank of a gas method urea device, and the concentration of a urea solution discharged from the flash tank is 70-83%; the ultrapure water pipe network is connected to and communicated with the ultrapure water inlet of the stirring separation tank; the electric stirrer is arranged in the stirring separation tank through an electric stirrer mounting port; the gas recovery port is communicated with the absorption tower through a pipeline; the bottom of the stirring separation tank is provided with a coil pipe with a hole, the nitrogen pipe network is communicated with the coil pipe at the bottom of the stirring separation tank through a nitrogen inlet of the stirring separation tank and is used for gas stripping of free ammonia, and the free ammonia enters the absorption tower through a gas recovery port; the automobile-used urea solution production line is characterized in that a discharge port is formed in the lower portion of the stirring separation tank, the discharge port is communicated with a product output pipe network, a solution pump is arranged on the product output pipe network and used for outputting automobile-used urea solution products, a branch pipe is further arranged on the product output pipe network, and the branch pipe is communicated with a product circulation inlet which is connected to the stirring separation tank.
Furthermore, the input end and the output end of the solution pump are provided with a closed pipeline communicated through a pipeline, and a product flow rate monitoring instrument and a temperature instrument are arranged on the closed pipeline.
Furthermore, at least one flow closed-loop control point is arranged on the urea supply pipe network and used for controlling the flow of the introduced urea solution in real time, and a communicated urea removal pipe network is arranged in front of the flow closed-loop control point on the urea supply pipe network.
Furthermore, at least one gas analysis closed-loop control point is arranged on the urea supply pipe network and used for monitoring and analyzing the volume of gas in the urea solution in the urea supply pipe network in real time.
Furthermore, a flow totalizing instrument and a temperature indicator are also arranged on the urea supply pipe network.
Furthermore, the urea supply pipe network is provided with at least one automatic valve closed-loop control point close to the stirring separation tank, the valve is controlled to open and close through signals, two ends of the automatic valve closed-loop control point are provided with communicating pipes, and the communicating pipes are provided with stop valves.
Furthermore, a temperature sensor, a gas analysis sensor and a liquid level sensor are arranged in the stirring separation tank, and a temperature indicating instrument, a gas analysis instrument and a liquid level display instrument which are connected with the corresponding sensors are arranged outside the stirring separation tank.
A preparation method of a urea solution for a vehicle comprises the steps of directly conveying a 70-83% urea solution produced by a flash tank of a urea device into a stirring separation tank through a pump, quickly stirring, removing about 0.55% of free ammonia in the urea solution through nitrogen gas stripping, communicating the top of the stirring separation tank to an absorption tower to recycle gas to the urea device for washing and recycling, adding ultrapure water with calculated amount after 2-hour stirring gas stripping separation, diluting to the urea concentration of 31.8-33.2%, uniformly stirring, circulating a circulating pump, cooling to the normal temperature through a cooler, and conveying to a finished product tank.
Advantageous effects
The vehicle urea production system and the process provided by the invention can be deeply integrated with the solid production and the liquid production of the existing urea device, are optimized in the aspects of public works and the like to the maximum extent, are complementary and matched in capacity, are used for energy resources in a gradient way, are more reasonable in material balance, and are used for recycling and comprehensively utilizing waste gas, waste liquid and waste residues.
The invention adopts the independently developed production process and configuration requirements, meets the requirements of standard products, greatly reduces the production cost, has simple production process flow, low technical content, short construction period, small investment, easy manufacture, quick response and easy expanded production. The automobile urea product has good market prospect and accords with the national energy development strategy and the national industrial policy, so the invention has better economic benefit and obvious social benefit, can improve the value-added effect of urea and accords with the requirement of 'revolutionary cost reduction'.
The invention can be completed by moving, modifying and installing equipment of the production stopping device. The problem of personnel shunting and arrangement caused by the fact that a small part of one-part company is arranged to stop production can be solved.
Drawings
FIG. 1 is a schematic view of the connection of the solution preparation section of the present invention;
FIG. 2 is a schematic view of the connection of the recycle gas section of the present invention;
FIG. 3 is a schematic view showing the connection of a storage section in the embodiment of the present invention;
fig. 4 is a schematic connection diagram of the filling section in the embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
As shown in fig. 1, a urea solution production system for a vehicle includes a stirring separation tank 1, a urea supply pipe network 2, a nitrogen pipe network 3, an ultrapure water pipe network 4, and a product output pipe network 5, wherein the stirring separation tank 1 is provided with a raw material feed port 11, an ultrapure water inlet 12, an electric stirrer 6 mounting port 13, a gas recovery port 14, a nitrogen inlet 15, and a product circulation inlet 16. Be equipped with temperature sensor, gas analysis sensor, level sensor in the stirring separator 1, be equipped with the temperature indicating instrument 19, gas analysis instrument 110, the liquid level display instrument 111 of being connected with the sensor that corresponds outside stirring separator 1, electric mixer 6 passes through electric mixer 6 installing port 13 and installs in stirring separator 1.
2 one end of urea supply pipe network is passed through raw materials feed inlet 11 and is linked together with stirring knockout drum 1, the external gas method urea device's of 2 other ends of urea supply pipe network flash drum, it is specific: using low temperature methanol wash process feedstock CO2CO produced by mixing with steam turbine process raw material liquid ammonia to produce urea2A technology for preparing liquid vehicle urea by using the intermediate urine of a stripping device, namely the urea solution with the concentration of 70-83% from a flash tank, directly stirring and separating free ammonia by using the raw material with the concentration, adding water for dilution and cooling.
The urea supply pipe network 2 is provided with at least one flow closed-loop control point 21 for controlling the flow of the introduced urea solution in real time, and a communicated urea removal pipe network 22 is arranged in front of the flow closed-loop control point 21 on the urea supply pipe network 2. The urea supply pipe network 2 is provided with at least one gas analysis closed-loop control point 23 for monitoring and analyzing the volume of gas in the urea solution in the urea supply pipe network 2 in real time. The urea supply pipe network 2 is also provided with a flow totalizing instrument 24 and a temperature indicator 25. The urea supply pipe network 2 is also provided with at least one automatic valve closed-loop control point 26 at a position close to the stirring separation tank 1, the valves are controlled to open and close through signals, two ends of the automatic valve closed-loop control point 26 are provided with communicating pipes 27, and the communicating pipes 27 are provided with stop valves 28.
The ultrapure water pipe network 4 is connected to and communicated with the ultrapure water inlet 12 of the stirring and separating tank 1; the vehicle urea solution strictly controls impurities, and because common tap water contains inorganic salts, chlorides and other trace elements, the common tap water cannot be directly used for preparing the vehicle urea solution and can be used for preparing the urea solution only after being treated to meet the requirement. Since tap water is not easy to be treated cleanly because of the use of various sterilization chemical agents in the production process, soft water meeting the requirements is generally obtained by treating deep underground water.
As shown in fig. 1-2, the gas recovery port 14 is connected to the absorption column 7 through a pipe; the bottom of the stirring separation tank 1 is provided with a coil 17 with an opening, the nitrogen pipe network 3 is communicated with the coil 17 at the bottom of the stirring separation tank 1 through a nitrogen inlet 15 of the stirring separation tank 1 and is used for gas stripping of free ammonia, the free ammonia enters the absorption tower 7 through a gas recovery port 14, the absorption tower 7 is provided with a condensed water circulation pipe network 71 to realize washing and recovery of the free ammonia, and the washed gas is output to the inside of the system from a recovery pipe network 72 at the upper part of the absorption tower to be reused, so that a zero discharge device for washing and recovery of the free ammonia is realized; stirring knockout drum 1 lower part is equipped with discharge gate 18, discharge gate 18 switches on product output pipe network 5, be equipped with solution pump 51 on the product output pipe network 5 and be used for exporting automobile-used urea solution product, solution pump 51's input and output are equipped with and are equipped with a closed pipeline through the pipeline intercommunication, be equipped with product velocity of flow monitoring instrument 53 and temperature instrument 54 on the closed pipeline.
The product output pipe network 5 is also provided with a branch pipe 52, and the branch pipe 52 is communicated with the product circulation inlet 16 connected to the stirring separation tank 1.
A preparation method of a urea solution for a vehicle comprises the steps of directly conveying a 70-83% urea solution produced by a flash evaporation tank of a urea device into a stirring separation tank 1 through a pump, quickly stirring, removing about 0.55% of free ammonia in the urea solution through nitrogen gas stripping, communicating the top of the stirring separation tank 1 to an absorption tower 7, recycling gas to the urea device, washing and recycling, adding ultrapure water with calculated amount after stirring gas stripping separation for 2 hours, diluting to the urea concentration of 31.8-33.2%, uniformly stirring, and circularly cooling to the normal temperature through a cooler by a circulating pump and then conveying to a finished product tank.
In the embodiment, the invention is used in the production of the company, the deep fusion of the project with the solid production and the liquid production of the existing urea device can be realized, the optimization is carried out on the aspects of public works and the like to the maximum extent, the complementary matching of the capacity is realized, the energy resource is utilized in a gradient way, the material balance is more reasonable, the waste gas, the waste liquid and the waste residue are recycled and comprehensively utilized, meanwhile, the direct configuration of the liquid urea which is cooled by flash evaporation omits the subsequent evaporation concentration granulation process, the steam and partial power consumption are saved, the production cost is reduced, the revolutionary cost reduction and the mental requirements of revolutionary construction projects are realized, as shown in figure 3, the produced automobile urea can be firstly stored in a modified storage tank 8, the project can be completed by moving, modifying and installing equipment of a one-division production stop device, and the problems of personnel diversion and installation caused by the installation of a small part of the, as shown in fig. 4, the product can be directly filled by relying on the existing filling pipe network 9 of our company, including a tank car filling pipe network 91 and a weighing filling pipe network 92, and the product is output to a transport vehicle and a filling container and sold by using the existing transport vehicle fleet and a filling station.
The project has the advantages of simple production process flow, low technical content, short construction period, small investment, easy manufacture, easy expanded production, good market prospect of the automotive urea product, accordance with the national energy development strategy and the national industrial policy, and meanwhile, the product can be adjusted according to the market condition.
The invention has better economic benefit and obvious social benefit, and the invention is further explained in the aspect of comparison of the technical scheme and cost benefit as follows:
1. comparing and selecting the technical scheme:
comparing the process for the production of urea for vehicles of the present invention with other processes for the production of urea, the results are given in the following table:
as can be seen from the above table, each of the three processes has characteristics, and the selection of the process mainly depends on the self-component of the raw material urea, the process for producing the urea raw material and the selection of equipment and facilities of a main urea device. The self-component condition of the raw material urea for preparing the automobile urea directly influences the selection of the automobile urea process, and the urea components produced by some devices per se exceed the standard compared with the indexes of the automobile urea, so that the cost for producing and preparing the automobile urea is higher. Experiments are carried out by combining the technical center of the urea device, and the items which can be analyzed by the experimental result meet the index requirements, so that the requirement of mass production of the device is met by adopting a matching process which is independently researched and developed.
2. Cost and benefit accounting:
1) calculating the cost, calculating the quantity by ton, calculating the selling price of the finished urea by the main device to be 1800/ton, calculating the cost of producing the vehicle urea by using 72 percent of urea solution, calculating the cost of the finished urea by two halves, calculating the cost of 1400 yuan, and 1000 yuan for 72 percent concentration urea, and calculating one ton of 32.5 percent vehicle urea by using 0.455 ton of 72 percent urea solution and 1.2 ton of ultrapure water by using 6 yuan. Electricity requires 1 degree per ton of solution, and the cost is =0.455X1000+1.2X6+1X0.6=463 yuan except for depreciation of the equipment.
2) The current market price is unequal to 1L1-2 Yuan, and basically to 930 Yuan 1830 Yuan per ton of vehicle urea.
3) The cost of equipment depreciation and labor is about 600 yuan per ton, and the benefit (900 and 600) of one year is x5 ten thousand ton =1500 ten thousand yuan per ton with the lowest market selling price of 900 yuan per ton.
Claims (8)
1. A urea solution production system for a vehicle is characterized by comprising a stirring and separating tank, a urea supply pipe network, a nitrogen pipe network, an ultrapure water pipe network and a product output pipe network, wherein the stirring and separating tank is provided with a raw material feed inlet, an ultrapure water inlet, an electric stirrer mounting port, a gas recovery port, a nitrogen inlet and a product circulation inlet; one end of the urea supply pipe network is communicated with the stirring separation tank through a raw material feeding hole, the other end of the urea supply pipe network is externally connected with a flash tank of a gas method urea device, and the concentration of a urea solution discharged from the flash tank is 70-83%; the ultrapure water pipe network is connected to and communicated with the ultrapure water inlet of the stirring separation tank; the electric stirrer is arranged in the stirring separation tank through an electric stirrer mounting port; the gas recovery port is communicated with the absorption tower through a pipeline; the bottom of the stirring separation tank is provided with a coil pipe with a hole, the nitrogen pipe network is communicated with the coil pipe at the bottom of the stirring separation tank through a nitrogen inlet of the stirring separation tank and is used for gas stripping of free ammonia, and the free ammonia enters the absorption tower through a gas recovery port; the automobile-used urea solution production line is characterized in that a discharge port is formed in the lower portion of the stirring separation tank, the discharge port is communicated with a product output pipe network, a solution pump is arranged on the product output pipe network and used for outputting automobile-used urea solution products, a branch pipe is further arranged on the product output pipe network, and the branch pipe is communicated with a product circulation inlet which is connected to the stirring separation tank.
2. The urea solution production system for vehicles of claim 1, wherein the input and output ends of the solution pump are connected by a pipeline to form a closed pipeline, and the closed pipeline is provided with a product flow rate monitoring instrument and a temperature instrument.
3. The urea solution production system for vehicles of claim 1, wherein at least one flow closed-loop control point is disposed on the urea supply pipe network for real-time flow control of the introduced urea solution, and a connected urea removal pipe network is disposed in front of the flow closed-loop control point on the urea supply pipe network.
4. The urea solution production system for vehicles of claim 1, wherein at least one gas analysis closed-loop control point is disposed on the urea supply pipe network for real-time monitoring and analysis of the gas volume in the urea solution in the urea supply pipe network.
5. The urea solution production system for vehicles according to claim 1, wherein a flow totalizer and a temperature indicator are further provided on the urea supply network.
6. The urea solution production system for vehicles of claim 1, wherein the urea supply network is further provided with at least one automatic valve closed-loop control point at a position close to the agitation separation tank, the automatic valve closed-loop control point is opened and closed by a signal control valve, two ends of the automatic valve closed-loop control point are provided with communication pipes, and the communication pipes are provided with stop valves.
7. The urea solution production system for vehicles of claim 1, wherein the agitation separation tank is provided with a temperature sensor, a gas analysis sensor and a liquid level sensor, and the agitation separation tank is externally provided with a temperature indicator, a gas analysis meter and a liquid level indicator connected with the corresponding sensors.
8. A preparation method of a urea solution for a vehicle is characterized in that a urea solution with the concentration of 70-83% produced by a flash evaporation tank of a urea device is directly conveyed into a stirring separation tank through a pump, the urea solution is rapidly stirred, free ammonia in the urea solution is removed through nitrogen gas stripping, the top of the stirring separation tank is communicated with an absorption tower, gas is recycled to the urea device for washing and recycling, ultrapure water with calculated amount is added after being separated for 2 hours through stirring gas stripping, the urea solution is diluted to the concentration of 31.8-33.2%, the urea solution is uniformly stirred, and a circulating pump circularly cools to the normal temperature through a cooler and then is conveyed to a finished product tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102638519B1 (en) * | 2023-06-14 | 2024-02-20 | 주식회사 블루텍 | Vehicle Urea Water Manufacturing Device and Manufacturing Method |
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| CN105056778A (en) * | 2015-09-22 | 2015-11-18 | 珠海格力电器股份有限公司 | Device and method for producing urea solution for vehicle |
| CN206121568U (en) * | 2016-10-20 | 2017-04-26 | 广州虹之源科技有限公司 | Automobile -used urea aqueous solution concentration real -time detection equipment |
| CN107930395A (en) * | 2017-11-10 | 2018-04-20 | 中国天辰工程有限公司 | A kind of production technology and system that urea for vehicle solution is prepared by industrial urea |
| CN212549034U (en) * | 2020-06-30 | 2021-02-19 | 河南晋开化工投资控股集团有限责任公司 | Automobile-used urea solution production system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102638519B1 (en) * | 2023-06-14 | 2024-02-20 | 주식회사 블루텍 | Vehicle Urea Water Manufacturing Device and Manufacturing Method |
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