CN107213824B - Method and device for manufacturing urea solution for vehicle - Google Patents
Method and device for manufacturing urea solution for vehicle Download PDFInfo
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- CN107213824B CN107213824B CN201710488454.1A CN201710488454A CN107213824B CN 107213824 B CN107213824 B CN 107213824B CN 201710488454 A CN201710488454 A CN 201710488454A CN 107213824 B CN107213824 B CN 107213824B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/10—Dissolving using driven stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2115—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method and a device for preparing urea solution for vehicles, wherein the method comprises the following steps of (a) adding raw materials; (b) urea granule dissolution; (c) data monitoring and correction; (d) calculating data; (e) adding high pure water; (f) repeating the step (c) of data monitoring and correction; (g) outputting the urea solution for the vehicle. The device comprises a control system, a stirring kettle, a urea concentration sensor and a temperature sensor, wherein the urea concentration sensor and the temperature sensor are arranged in the stirring kettle; a water inlet pipeline is arranged at the upper end of the stirring kettle, a first flowmeter is arranged on the water inlet pipeline, and the urea concentration sensor and the first flowmeter are both electrically connected with the control system; the control system comprises a data acquisition and correction unit. In conclusion, the method and the device for manufacturing the urea solution for the vehicle can not only manufacture the urea solution for the vehicle with qualified concentration, but also avoid the problem of unqualified concentration of the urea solution caused by no manual feeding error and inaccurate low-temperature monitoring data of the urea concentration sensor.
Description
Technical Field
The invention belongs to the technical field of automobile urea solution, and particularly relates to a method and a device for manufacturing automobile urea solution.
Background
In the production process of the automobile urea solution, a certain amount of metered urea particles and ultrapure water are directly added into a stirring kettle for mixing and stirring, so that the automobile urea solution with qualified concentration can be obtained. In actual production, accidents may occur in the manual feeding process, such as urea particles are scattered; or the actual urea loading amount and the standard amount have a certain difference when the urea leaves the factory. The above conditions can affect the concentration of the vehicle urea solution, so that the concentration of the produced vehicle urea solution is not satisfactory.
In the prior art, a urea concentration sensor is mostly adopted to monitor the concentration of a urea solution so as to ensure that the concentration of the produced automobile urea solution is qualified. Because the urea needs to absorb heat continuously in the dissolving process, the temperature of the vehicle urea solution which is just prepared is lower. The monitoring data of the urea concentration sensor at low temperature is generally higher than the actual value of the urea concentration, and the resulting error affects the final quality of the vehicle urea solution.
Disclosure of Invention
In view of the above drawbacks, the first technical problem to be solved by the present invention is: the method can be used for manufacturing the urea solution for the vehicle with qualified urea solubility, and reduces the influence of manual operation errors on the concentration of the urea solution.
The second technical problem to be solved by the invention is: the device for manufacturing the urea solution for the vehicle is provided, the urea solution for the vehicle with qualified concentration can be manufactured by using the device, and the problem that the concentration of the urea solution is unqualified due to the fact that manual feeding errors are avoided and low-temperature monitoring data of a urea concentration sensor are inaccurate can be avoided.
In order to solve the first technical problem, the technical scheme of the invention is as follows:
a method of manufacturing a urea solution for vehicles, comprising the steps of:
(a) Adding raw materials: adding high-purity water and urea particles into a reaction kettle, and automatically monitoring the adding amount of the high-purity water: the added high-purity water must submerge urea particles, and urea solution with higher concentration is firstly prepared according to empirical values;
(b) Dissolving urea particles: starting a motor to stir until the urea particles are completely dissolved;
(c) Data monitoring and correction: monitoring the concentration and temperature of the vehicle urea solution in the reaction kettle, and transmitting data to a control system for correction;
(d) And (3) data calculation: according to the corrected concentration of the automobile urea solution and the amount of the added high-purity water, the control system automatically calculates the mass delta m of the high-purity water which is required to be added into the automobile urea solution with qualified mixture ratio i ；
(e) Adding pure water: according to the result calculated in the step (d), adding quantitative high-purity water m into the reaction kettle i Wherein m is i ≤Δm i ；
(f) Repeating the step (c) data monitoring and correction;
(g) Outputting the urea solution for the vehicle: if the corrected concentration of the vehicle urea solution is qualified, outputting the qualified vehicle urea solution through a liquid outlet, and automatically metering the amount of the qualified vehicle urea solution; and if not, continuously repeating the step (d) and the step (e) until the vehicle urea solution with qualified concentration is manufactured.
Preferably, in the step (c) data monitoring and correction, a standard curve of the urea concentration sensor reading along with the temperature change is preset in the control system, and the urea concentration sensor reading rho is recorded 01 And temperature sensor reading T 01 Obtaining the actual concentration rho of the urea solution by contrasting with the standard curve 1 。
Preferably, in the step (d) data calculation, the mass m of the urea granules added in the step (a) is calculated first 0 ，
According to
Is calculated to obtain
Wherein m is 1 For the first addition of the mass of highly purified water, the first measured converted actual concentration ρ of the urea solution 1 ；
Next, the mass Δ m of high purity water to be added for the second time is calculated 2 ，
similarly, the mass of the high purity water added secondarily in the ith stage can be calculated:
wherein, Δ m i Theoretical value of mass of water to be added for the i-th time, m i At the ith timeThe mass of water actually added;
is calculated to obtain
Preferably, in the step (c) data monitoring and correction, data acquisition is performed after readings of the temperature sensor and the concentration sensor in the reaction kettle are stable.
In order to solve the second technical problem, the technical scheme of the invention is as follows:
a device for manufacturing a urea solution for a vehicle comprises a control system, a stirring kettle, a urea concentration sensor and a temperature sensor, wherein the urea concentration sensor and the temperature sensor are arranged in the stirring kettle; a water inlet pipeline is arranged at the upper end of the stirring kettle, a first flowmeter is arranged on the water inlet pipeline, and the urea concentration sensor and the first flowmeter are both electrically connected with the control system; the control system comprises a data acquisition and correction unit.
As an improvement, the urea concentration sensor is an infrared photosensitive urea concentration sensor; a darkroom is arranged in the stirring kettle, and the urea concentration sensor is arranged in the darkroom.
As an improvement, a pump is further arranged in the stirring kettle, a flushing pipe is connected to the pump, and the other end of the flushing pipe is aligned to the urea concentration sensor.
As an improvement, a liquid level meter is further arranged in the stirring kettle and is electrically connected with the control system.
As an improvement, the upper end of the stirring kettle is also provided with a feed inlet, the lower end of the stirring kettle is provided with a liquid outlet, and a second flowmeter is arranged at the liquid outlet.
As a modification, the distance from the urea concentration sensor to the bottom of the stirring kettle is 25cm to 35 cm.
By adopting the technical scheme, the invention has the beneficial effects that:
1. and monitoring the concentration of the automobile urea solution in real time by using a urea concentration sensor, and adjusting the water inflow of the high-purity water until the automobile urea solution with qualified urea concentration is manufactured. The control system comprises a data acquisition and correction unit and is used for solving the problem of inaccurate low-temperature monitoring data of the urea concentration sensor.
2. The amount of urea solution for vehicles produced can be automatically metered using the second flow meter.
3. The urea concentration sensor is arranged in the darkroom, so that the urea concentration sensor is not interfered by external light, and the monitoring result is more accurate and reliable.
In conclusion, the method and the device for manufacturing the urea solution for the vehicle can not only manufacture the urea solution for the vehicle with qualified concentration, but also avoid the problem of unqualified concentration of the urea solution caused by no manual feeding error and inaccurate low-temperature monitoring data of the urea concentration sensor.
Drawings
FIG. 1 is a schematic diagram of an apparatus for manufacturing a urea solution for vehicles according to the present invention;
FIG. 2 is a standard curve of urea concentration sensor readings as a function of temperature;
wherein: 1-a stirring kettle, 11-a water inlet pipeline, 12-a water inlet valve, 13-a first flowmeter, 14-a material inlet, 15-a liquid outlet, 16-a second flowmeter, 17-a liquid outlet valve, 2-a urea concentration sensor, 3-a temperature sensor, 4-a liquid level meter, 5-a dark room, 6-a rotating shaft, 7-a stirring blade, 8-a motor, 9-a pump and 91-a flushing pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Referring to fig. 1, an apparatus for producing a urea solution for a vehicle includes a control system (not shown), a stirring tank 1, a urea concentration sensor 2 installed inside the stirring tank 1, a temperature sensor 3, and a level gauge 4. The upper end of the stirring kettle 1 is provided with a water inlet pipeline 11, and the water inlet pipeline 11 is provided with a water inlet valve 12 and a first flowmeter 13. The upper end of the stirring kettle 1 is also provided with a feed inlet 14, the lower end is provided with a liquid outlet 15, and a second flowmeter 16 and a liquid outlet valve 17 are arranged at the liquid outlet 15.
As shown in fig. 1, the urea concentration sensor 2 is an infrared sensitive urea concentration sensor. Be equipped with darkroom 5 in stirred tank 1, urea concentration sensor 2 installs in darkroom 5, can guarantee that urea concentration sensor 2 does not receive the interference of external light, and the monitoring result is more accurate, reliable. The distance from the urea concentration sensor 2 to the bottom of the stirring kettle 1 is 25 cm-35 cm. The position can not only avoid the area where the urea at the bottom is not completely dissolved, but also ensure that the urea concentration sensor 2 is arranged in the urea solution, so that the monitoring data is more accurate and reliable. A rotating shaft 6 and a stirring blade 7 arranged on the rotating shaft 6 are arranged in the stirring kettle 1, and the rotating shaft 6 is rotationally connected with a motor 8 arranged outside the stirring kettle 1. The stirring kettle 1 is also internally provided with a pump 9, the pump 9 is connected with a flushing pipe 91, and the other end of the flushing pipe 91 is aligned with the urea concentration sensor 2. Automobile-used urea solution of flushing pipe 91 spun constantly strikes urea concentration sensor 2 in the automobile-used urea solution production process, can prevent that the bubble from being adsorbed on urea concentration sensor 2's surface, and urea concentration sensor 2's monitoring data is more accurate.
As shown in fig. 1, the control system includes a data acquisition modification unit (not shown). As shown in fig. 2, the data measured by the urea concentration sensor 2 at normal temperature is stable and accurate, and the data measured at low temperature is higher than the actual concentration of the urea solution. A standard curve of the reading of the urea concentration sensor 2 changing along with the temperature is preset in the data acquisition and correction unit so as to solve the problem that the monitoring data of the urea concentration sensor 2 is inaccurate at low temperature. The urea concentration sensor 2, the water inlet valve 12, the first flowmeter 13, the second flowmeter 16, the liquid outlet valve 17, the liquid level meter 4, the temperature sensor 3 and the motor 8 are all electrically connected with the control system.
A method of making a urea solution for a vehicle: the method comprises the following steps:
(a) Adding raw materials: adding high-purity water and urea particles into a reaction kettle, and automatically monitoring the adding amount of the high-purity water: the added high-purity water must be over the urea particles, and the urea solution with higher concentration is firstly proportioned according to empirical values. In general, the concentration of the urea solution for vehicles is required to be 32.5%, and then according to experience, the concentration of the urea solution produced by adding high-efficiency water should be higher than 32.5%.
(b) Dissolving urea particles: starting the motor to stir until the urea particles are completely dissolved. Since urea particle dissolution is a continuous endothermic process, usually about 20 minutes, the readings of the temperature sensor and the urea concentration sensor are stable, indicating that the urea particles are sufficiently dissolved.
(c) Data monitoring and correction: and monitoring the concentration and the temperature of the vehicle urea solution in the reaction kettle, and acquiring data after the readings of the temperature sensor and the concentration sensor in the reaction kettle are stable. And transmitting the data to a control system for correction; recording urea concentration sensor reading ρ 01 And temperature sensor reading T 01 Obtaining the actual concentration rho of the urea solution by contrasting with the standard curve 1 。
(d) And (3) data calculation: according to the corrected concentration of the automobile urea solution and the amount of the added high-purity water, the control system automatically calculates the mass delta m of the high-purity water which is required to be added into the automobile urea solution with qualified mixture ratio i ；
Firstly, the mass m of the urea granules added in the step (a) is calculated 0 ，
According to
Is calculated to obtain
Wherein m is 1 For the first addition of the mass of highly purified water, the first measured converted actual concentration ρ of the urea solution 1 ；
Next, the mass Δ m of high purity water to be added for the second time is calculated 2 ，
similarly, the amount of high purity water added secondarily i can be calculated:
wherein, Δ m i Theoretical value of mass of water to be added for the i-th time, m i The mass of water actually added for the ith time;
is calculated to obtain
(e) Adding pure water: according to the result calculated in the step (d), adding a certain amount of high-purity water into the reaction kettle, wherein the mass m of the high-purity water is added 2 ≤Δm 2 . As is preferred in the present embodiment, the first,
(f) Repeating step (c): if the corrected concentration of the vehicle urea solution is qualified, outputting the qualified vehicle urea solution through a liquid outlet, and automatically metering the amount of the qualified vehicle urea solution; if not, continuing to repeat the step (d) and the step (e) until the vehicle urea solution with qualified concentration is produced.
After several times of water addition and detection, the produced automotive urea solution reaches the concentration value required by us.
In conclusion, the method and the device for manufacturing the urea solution for the vehicle can avoid the problem that the concentration of the urea solution for the vehicle is not qualified due to the fact that manual feeding errors are avoided and low-temperature monitoring data of the urea concentration sensor are not accurate, and the manufactured urea solution for the vehicle is qualified in concentration and high in quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for manufacturing a urea solution for vehicles, characterized by comprising the steps of:
(a) Adding raw materials: adding high-purity water and urea particles into a reaction kettle, and automatically monitoring the adding amount of the high-purity water: the added high-purity water must submerge urea particles, and urea solution with higher concentration is firstly prepared according to empirical values;
(b) Dissolving urea particles: starting a motor to stir until the urea particles are completely dissolved;
(c) Data monitoring and correction: monitoring the concentration and temperature of the vehicle urea solution in the reaction kettle, and transmitting data to a control system for correction;
(d) And (3) data calculation: according to the corrected concentration of the vehicle urea solution and the amount of the added high-purity water, the control system automatically calculates the mass delta m of the high-purity water which is required to be added into the vehicle urea solution with qualified mixture ratio i ；
(e) Adding pure water: according to the result calculated in the step (d), adding quantitative high-purity water m into the reaction kettle i Wherein m is i ≤Δm i ；
(f) Repeating the step (c) data monitoring and correction;
(g) Outputting the urea solution for the vehicle: if the corrected concentration of the vehicle urea solution is qualified, outputting the qualified vehicle urea solution through a liquid outlet, and automatically metering the amount of the qualified vehicle urea solution; if not, continuing to repeat the step (d) and the step (e) until the vehicle urea solution with qualified concentration is manufactured;
in the step (c) data monitoring and correction, a standard curve of the reading of the urea concentration sensor changing along with the temperature is preset in the control system, and the reading rho of the urea concentration sensor is recorded 01 And temperature sensor reading T 01 Obtaining the actual concentration rho of the urea solution by contrasting with the standard curve 1 ；
In the step (d) of data calculation,
firstly, the mass m of the urea granules added in the step (a) is calculated 0 ，
According to
Is calculated to obtain
Wherein m is 1 For the first addition of the mass of highly purified water, the first measured converted actual concentration ρ of the urea solution 1 ；
Next, the mass Δ m of high purity water to be added for the second time is calculated 2 ，
similarly, the amount of the high purity water to be added at the ith time can be calculated as follows:
wherein, Δ m i Theoretical value of mass of water to be added for the i-th time, m i The mass of water actually added for the ith time;
is calculated to obtain
2. The method for manufacturing a urea solution for vehicles according to claim 1, characterized in that: and (c) in the data monitoring and correction in the step (c), after the readings of the temperature sensor and the concentration sensor in the reaction kettle are stable, acquiring data.
3. An apparatus for manufacturing urea solution for vehicles according to claim 1, characterized in that: the device comprises a control system, a stirring kettle, a urea concentration sensor and a temperature sensor, wherein the urea concentration sensor and the temperature sensor are arranged in the stirring kettle; a water inlet pipeline is arranged at the upper end of the stirring kettle, a first flowmeter is arranged on the water inlet pipeline, and the urea concentration sensor and the first flowmeter are both electrically connected with the control system; the control system comprises a data acquisition and correction unit.
4. The apparatus for manufacturing urea solution for vehicles according to claim 3, wherein: the urea concentration sensor is an infrared photosensitive urea concentration sensor; a darkroom is arranged in the stirring kettle, and the urea concentration sensor is arranged in the darkroom.
5. The apparatus for manufacturing urea solution for vehicles according to claim 3, wherein: and a pump is further arranged in the stirring kettle, a flushing pipe is connected to the pump, and the other end of the flushing pipe is aligned to the urea concentration sensor.
6. The apparatus for manufacturing urea solution for vehicles according to claim 3, wherein: and a liquid level meter is also arranged in the stirring kettle and is electrically connected with the control system.
7. The apparatus for manufacturing urea solution for vehicles according to claim 3, wherein: the upper end of the stirring kettle is also provided with a feed inlet, the lower end of the stirring kettle is provided with a liquid outlet, and a second flowmeter is arranged at the liquid outlet.
8. The apparatus for manufacturing urea solution for vehicles according to claim 3, wherein: the distance between the urea concentration sensor and the bottom of the stirring kettle is 25 cm-35 cm.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107744730A (en) * | 2017-11-07 | 2018-03-02 | 山东新蓝环保科技有限公司 | A kind of quick manufacturing machine of urea for vehicle solution |
| CN109126490A (en) * | 2018-09-07 | 2019-01-04 | 珠海格力智能装备有限公司 | Method and device for preparing urea solution |
| CN108970461B (en) * | 2018-09-07 | 2020-09-01 | 珠海格力智能装备有限公司 | Agitating unit and have its urea machine |
| CN111589312A (en) * | 2020-06-01 | 2020-08-28 | 珠海格力智能装备有限公司 | Method and device for dissolving urea, storage medium, processor and stirring system |
| CN112426961A (en) * | 2020-11-02 | 2021-03-02 | 珠海格力智能装备有限公司 | Method and device for generating urea solution and system for generating urea solution |
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