Portable small urea solution preparation device

Abstract

A portable small urea solution preparation device, comprising: a dissolution tank (5); a base frame (3), the base frame (3) being mounted at the bottom of the dissolution tank (5); and a storage tank (13), the storage tank (13) being arranged at the bottom of the base frame (3), and a liquid level sensor (12) being mounted inside the storage tank (13). The urea solution preparation device is small and portable, reusable, highly automated, and simple to operate and easy to use, and can rapidly prepare a urea solution at low cost anytime and anywhere by means of convenient ultrasonic vibration stirring, thereby solving the problems faced by owners of large diesel machinery, SCR denitration liquid preparation workshops of power stations, operators in the commercial diesel vehicle transportation industry, and owners of small diesel vehicles when using urea solutions, such as the cumbersome preparation of a urea solution, inconvenience of bulk transportation, lack of refilling stations, and high prices for urea solutions at refilling stations. Due to the ease of use of the device, the device can be used in SCR denitration liquid preparation workshops of coal-fired power stations, greatly reducing the investment in equipment and greatly improving production efficiency.

Description

A portable, small-scale urea solution preparation device Technical Field

[0001] This invention relates to the field of urea solution production technology, and to a portable urea solution preparation device. Background Technology

[0002] The main pollutants in diesel engine exhaust emissions include nitrogen oxides and sulfides. Sulfides are primarily related to the sulfur content of the diesel fuel itself; reducing the sulfur content can control diesel sulfide emissions. The formation of nitrogen oxides is mainly related to the combustion characteristics of the diesel engine. Because diesel engines use compression ignition, their cylinder temperatures and pressures are relatively high, and the air-fuel ratio is large. Therefore, during combustion, a significant amount of nitrogen oxides are produced in the cylinder, which are emitted into the atmosphere with the exhaust gases, causing pollution.

[0003] Selective catalytic reduction (SCR) is an effective method for controlling nitrogen oxide emissions from diesel engine exhaust. By injecting a urea solution into the exhaust pipe, the urea solution evaporates and decomposes to produce reducing NH3. This reducing NH3 mixes with NOx, and under the catalysis of a catalyst, the NOx is reduced to nitrogen and water, thus controlling nitrogen oxide emissions. Because the reduction reaction occurs within a relatively low temperature range (315–400°C) and requires a catalyst, it is called selective catalytic reduction (SCR).

[0004] Urea dissolves endothermally in water, requiring heating and stirring, which places certain demands on the equipment and water quality. Therefore, commercially available urea solutions are generally pre-packaged and manufactured in factories for sale at gas stations, refueling points, or other retail outlets. For users with diesel engines, owners of commercial diesel long-haul trucks, and owners of small diesel passenger vehicles, the consumption of urea solution is high. Carrying too much urea solution at once is uneconomical, and the lack of refueling points or excessively high prices at refueling points can cause significant inconvenience when the solution runs out.

[0005] In summary, a portable, small-scale urea solution preparation device is needed to solve the above problems.

[0006] Summary of the Invention

[0007] The purpose of this invention is to provide a portable, small-scale urea solution preparation device to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A portable, small-scale urea solution preparation mechanism, comprising:

[0010] Dissolving box;

[0011] A chassis base is installed at the bottom of the dissolving tank;

[0012] A storage tank is located at the bottom of the chassis base, and a liquid level sensor is installed inside the storage tank;

[0013] A solid feeding mechanism is located at the top of the dissolving tank. A feeding device is provided at the bottom of the solid feeding mechanism, and a urea granule hopper is installed at the top of the feeding device for automatic feeding of urea granules.

[0014] The dissolved water filtration mechanism consists of a filter cartridge assembly, which is mounted on the chassis base on the side of the dissolving tank and is used to remove mechanical impurities and metal ions from the water.

[0015] A control box is located on the other side of the chassis base;

[0016] An ultrasonic vibration stirring mechanism, comprising an ultrasonic generator and a stirrer, both of which are located inside a dissolving tank for constant temperature heating and solid urea dissolution.

[0017] A concentration sensor is installed on the dissolving tank at the top of the stirrer.

[0018] Preferably, a feeding motor, a material level sensor, and a vibration motor are installed between the hopper and the feeding device.

[0019] Preferably, a small magnetic pump and a filter are installed inside the filter cartridge assembly.

[0020] Preferably, the outer side of the chassis base is fitted with a chassis shell.

[0021] Preferably, a touch screen is provided on the front of the chassis housing.

[0022] Preferably, the dissolving tank has a built-in water tank constant temperature heater for constant temperature heating and urea dissolution.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The urea solution preparation equipment of the present invention is small and portable, reusable, highly automated, simple to operate, and convenient to use. It adopts convenient ultrasonic vibration stirring to prepare urea solution quickly and at low cost anytime and anywhere. It solves the problems encountered by owners of large diesel equipment, SCR denitrification fluid preparation workshops in power plants, commercial diesel vehicle transportation industry operators, and small diesel vehicle owners when using urea solution, such as troublesome urea solution preparation, inconvenience in carrying large quantities, lack of refueling points, and high price of urea solution at refueling points. Due to the ease of use of the equipment, it can be used in SCR denitrification fluid preparation workshops of coal-fired power plants, greatly reducing equipment investment and greatly improving production efficiency. Attached Figure Description

[0024] Figure 1 shows a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 shows a schematic diagram of the chassis shell structure of the present invention;

[0026] Figure 3 shows a schematic diagram of the location of the control box of the present invention;

[0027] Figure 4 shows a front view of the solid feeding mechanism of the present invention;

[0028] Figure 5 shows a schematic diagram of the back of the solid feeding mechanism of the present invention;

[0029] Figure 6 shows a schematic diagram of the installation structure of the solid feeding mechanism of the present invention.

[0030] In the diagram: 1. Touch screen; 2. Chassis shell; 3. Chassis base; 4. Filter cartridge assembly; 5. Dissolving tank; 6. Control box; 7. Hopper; 8. Feeding device; 9. Ultrasonic generator; 10. Stirrer; 11. Concentration sensor; 12. Liquid level sensor; 13. Storage tank; 14. Solid feeding mechanism; 15. Dissolving water filtration mechanism; 16. Ultrasonic vibration stirring mechanism. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please refer to Figures 1-6. This invention provides a technical solution:

[0033] A portable, small-scale urea solution preparation mechanism, comprising:

[0034] Dissolving tank 5, with a built-in water tank and constant temperature heater;

[0035] The chassis base 3 is installed at the bottom of the dissolving tank 5. The chassis base 3 is fitted with a chassis shell 2 on the outside. The front of the chassis shell 2 is equipped with a touch screen 1.

[0036] Storage tank 13 is located at the bottom of chassis base 3, and liquid level sensor 12 is installed inside storage tank 13;

[0037] Solid feeding mechanism 14 is located at the top of the dissolving tank 5. A feeding device 8 is provided at the bottom of the solid feeding mechanism 14. A urea granule hopper 7 is installed at the top of the feeding device 8. A feeding motor, a material level sensor and a vibration motor are installed between the hopper 7 and the feeding device 8 for automatic feeding of urea granules.

[0038] The dissolved water filtration mechanism 15 is composed of a filter element group 4. The filter element group 4 is equipped with a small magnetic pump and a filter. The filter element group 4 is set on the chassis base 3 on the side of the dissolving tank 5 and is used to remove mechanical impurities and metal ions from the water.

[0039] Control box 6 is located on the other side of chassis base 3;

[0040] The ultrasonic vibration stirring mechanism 16 consists of an ultrasonic generator 9 and a stirrer 10. Both the ultrasonic generator 9 and the stirrer 10 are installed inside the dissolving tank 5 and are used for constant temperature heating and solid urea dissolution.

[0041] Concentration sensor 11 is located on the dissolving tank 5 at the top of the stirrer 10.

[0042] Example

[0043] Specifically, please refer to Figures 1 to 6 during the implementation process;

[0044] Please refer to Figures 1-4 for a portable small vehicle urea solution preparation device. The main body of the device includes a metering control box 6, a filter cartridge group 4, a dissolving tank 5, and other auxiliary equipment.

[0045] External water enters the filter cartridge 4 for filtration to obtain ultrapure water, which is then metered by a flow meter and enters the dissolving tank 5.

[0046] Urea granules are slowly fed into the dissolving tank 5 via the feeding device 8 from the silo 7.

[0047] The urea particles and ultrapure water in the dissolving tank 5 are vibrated by the ultrasonic generator 9, which makes the urea particles dissolve quickly into the water. The small stirring device stirs and circulates to quickly homogenize the dissolved urea solution.

[0048] After filtration, the urea solution yields a finished product with a concentration of 32.5 ± 0.5%.

[0049] The filter element 4 is equipped with a feed valve and a water pump at the front end to cut off the water source at any time and increase the water pressure of the filtered water to facilitate filtration. At the same time, the filter element 4 is equipped with a high-point exhaust to reduce air resistance in the pipeline and increase the measurement accuracy of the flow meter.

[0050] The filter element 4 is equipped with a life alarm. In automatic operation, when the production volume exceeds 1000-1500L, the system will alarm for several minutes and switch to the stop state. The touch screen 1 will remind the user to replace the filter element group 4. After the filter element group 4 is replaced, click "Replaced Filter Element Group 4" in the maintenance, and the equipment will automatically de-alarm.

[0051] The dissolving chamber 5 is equipped with a constant temperature electric heating device, and the constant temperature (20-40℃) can be set through the human-machine interface of the touch screen 1. This provides a heat source for the dissolution and heat absorption of urea particles, accelerating the dissolution of urea particles, especially when preparing urea solution in winter.

[0052] The upper end of the dissolving tank 5 is connected to the urea granule silo 7 and the feeding device 8; the urea granule silo 7 and the feeding device 8 are equipped with a feeding motor and a vibration motor to facilitate the smooth feeding of urea granules.

[0053] Meanwhile, a low-level alarm is set on the urea granule hopper 7. When urea solution is being prepared continuously, the equipment will automatically alarm when the urea granules are almost used up, reminding the user to add urea granules to the hopper 7. If urea granules are added, the equipment will automatically stop.

[0054] The dissolving tank 5 has two working modes: manual and automatic, which can be set on the human-machine interface of the touch screen 1.

[0055] When set to manual operation, after adding a quantitative amount of dissolving water to dissolving tank 5, a quantitative amount of solid urea is added manually to prepare 10L of urea solution. After being pumped out by the urea solution discharge pump and filtered, a urea solution with a concentration of 32.5±0.5% is obtained.

[0056] When set to continuous operation, after the dissolved water is quantitatively added to the dissolving tank 5, solid urea is slowly added. The urea concentration in the dissolving tank 5 is monitored by the urea concentration sensor 11. If the concentration is insufficient, it is slowly added until the concentration reaches the standard (32.5±0.5% urea solution). After the dissolution is completed and the concentration reaches the standard, the urea solution is pumped out by the urea solution discharge pump and filtered to obtain the finished urea solution with a concentration of 32.5±0.5%. The solution tank is then refilled with material to enter the next cycle.

[0057] In continuous operation mode, the prepared urea solution with the required concentration is filtered from the dissolving tank 5 and enters the storage tank 13. When the liquid level in the storage tank 13 is high, the preparation process automatically stops.

[0058] When the solution level drops to a low level, the preparation process restarts automatically.

[0059] A stirrer 10 is installed in the dissolving tank 5 to ensure that the urea is fully mixed with ultrapure water after liquefaction.

[0060] In addition, if the concentration of the dissolving solution is not up to standard, an alarm system will be triggered, and all systems will stop and sound an alarm.

[0061] The storage tank 13 is equipped with a vehicle-mounted urea solution gun and a corresponding discharge pump, which makes it convenient to add the prepared urea solution at any time.

[0062] The portable small vehicle-mounted urea solution preparation equipment can be powered by either DC12V / 24V or AC110V / 220V.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable, small-scale urea solution preparation mechanism, characterized in that... ,include: Dissolving box (5); Chassis base (3), chassis base (3) is installed at the bottom of the melting tank (5); Storage tank (13) is located at the bottom of the chassis base (3), and a liquid level sensor (12) is installed inside the storage tank (13); Solid feeding mechanism (14) is located at the top of the dissolving tank (5). The bottom of the solid feeding mechanism (14) is provided with a feeding device (8). The top of the feeding device (8) is equipped with a urea granule hopper (7) for automatic feeding of urea granules. The dissolved water filtration mechanism (15) is composed of a filter element group (4), which is set on the chassis base (3) on the side of the dissolving tank (5) and is used to remove mechanical impurities and metal ions from the water. Control box (6), the control box (6) is located on the other side of the chassis base (3); An ultrasonic vibration stirring mechanism (16) is composed of an ultrasonic generator (9) and a stirrer (10). The ultrasonic generator (9) and the stirrer (10) are both installed inside the dissolving tank (5) for constant temperature heating and solid urea dissolution. A concentration sensor (11) is installed on the dissolving tank (5) at the top of the stirrer (10).

2. The portable small-scale urea solution preparation device according to claim 1, characterized in that: A feeding motor, a material level sensor, and a vibration motor are installed between the hopper (7) and the feeding device (8).

3. The portable small-scale urea solution preparation device according to claim 2, characterized in that: The filter cartridge assembly (4) contains a small magnetic pump and a filter.

4. The portable small-scale urea solution preparation device according to claim 3, characterized in that: The chassis base (3) is fitted with a chassis shell (2) on its outer side.

5. The portable small-scale urea solution preparation device according to claim 4, characterized in that: The front of the chassis shell (2) is equipped with a touch screen (1).

6. The portable miniature urea solution preparation device according to claim 5, characterized in that: The dissolving tank (5) has a built-in water tank constant temperature heater, which is used for constant temperature heating and urea dissolution.

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