A production feed device for preparing automotive urea from molten urea

Abstract

The utility model discloses a kind of production feeders for preparing vehicle urea from molten urea, belong to vehicle urea production equipment device field.The above-mentioned device includes pure water feed unit, molten urea feed unit, mixing unit and vehicle urea finished product tank, pure water feed unit and molten urea feed unit are respectively used to deliver pure water and molten urea solution into mixing unit, after pure water and molten urea solution are mixed, it is delivered into vehicle urea finished product tank, pure water feed unit is connected with molten urea feed unit by flushing pipeline, for flushing residual molten urea.The utility model uses molten urea solution tank car as molten urea raw material, can reduce energy consumption in production;The content of vehicle urea is controlled in real time by flow control meter, thermometer and urea content tester etc., molten urea feed unit is flushed in real time by flushing pipeline, finally realizes the efficient and fast mixing of pure water and molten urea solution.

Description

Technical Field

[0001] This utility model relates to the field of automotive urea production equipment, specifically to a production feeding device for preparing automotive urea from molten urea. Background Technology

[0002] Because the original exhaust of diesel engines cannot meet the current national standards for nitrogen oxide emissions limits, existing technology adds an exhaust gas treatment device to achieve denitrification, namely the SCR aftertreatment system. Its main function is to catalyze the reaction of ammonia and nitrogen oxides to produce nitrogen and water. The ammonia is primarily provided by the decomposition of urea solution, which is atomized and injected into the exhaust system through a urea injection system to participate in the reaction. The main impurity in automotive urea solution is biuret, which significantly exacerbates scale formation and accumulation. Relevant standards for automotive urea have specific requirements regarding the content of this impurity. The biuret content in domestically produced urea granules is relatively high, just meeting the requirements, which has led to the common phenomenon of exhaust system blockage in the industry.

[0003] Currently, urea granules are used as raw materials in the production of automotive urea solutions. While urea granules have certain advantages in transportation and storage, the high-temperature granulation process significantly increases the biuret content, making them prone to clogging in the aftertreatment system during use. Molten urea solutions, on the other hand, do not require granulation and have a biuret content far below national standards, making them more suitable as a raw material for automotive urea.

[0004] To address the issues encountered during the use of automotive urea solution, it is necessary to change the raw materials used in its production. However, the process of introducing molten urea solution into the production of automotive urea solution involves complex aspects such as raw material transportation, storage, and production processes, necessitating upgrades and modifications to production equipment. Utility Model Content

[0005] Purpose of the utility model: The present utility model aims to provide a production feeding device for preparing automotive urea from molten urea, which can achieve rapid and continuous feeding, rapid cooling, real-time monitoring of feed rate and mixed solution content, and thus achieve efficient and rapid mixing of pure water and molten urea solution.

[0006] Technical Solution: The production feeding device for preparing automotive urea from molten urea according to this utility model includes a pure water feeding unit, a molten urea feeding unit, a mixing unit, and an automotive urea finished product tank. The pure water feeding unit is used to transport pure water to the mixing unit. The molten urea feeding unit is used to transport molten urea solution to the mixing unit. The mixing unit mixes the pure water and molten urea solution and then transports the mixture to the automotive urea finished product tank. The pure water feeding unit is connected to the molten urea feeding unit through a flushing pipe for flushing residual molten urea.

[0007] Furthermore, the pure water feeding unit includes a pure water storage tank and a pure water conveying pipeline connected to the pure water pipeline. The pure water conveying pipeline is equipped with a flow controller, which can control the feed rate of pure water and provide blending data for subsequent processes.

[0008] Furthermore, the molten urea feeding unit includes a molten urea solution tank truck and a molten urea conveying pipeline connected to the molten urea tank truck. The molten urea conveying pipeline is equipped with a flow controller, a thermometer, and a urea content tester in sequence according to the flow direction of the molten urea solution.

[0009] Furthermore, the molten urea conveying pipeline is made of stainless steel, which meets the high-temperature performance requirements of molten urea and the corrosion resistance requirements of high-concentration urea.

[0010] Furthermore, the mixing unit includes a mixing reactor and a stirring device.

[0011] Furthermore, the mixing reactor is made of stainless steel, which can meet the high-temperature storage requirements of molten urea.

[0012] Furthermore, the mixing unit is connected to the vehicle urea finished product tank via a pipeline.

[0013] Furthermore, the pipeline is equipped with a urea content tester, which can monitor the urea content in real time and adjust the ratio of pure water to molten urea in a timely manner, thus simplifying the production process.

[0014] Beneficial effects: Compared with the prior art, this utility model has the following advantages: (1) Using the molten urea solution tank truck as the raw material for molten urea, which has a high temperature (around 80°C) and does not require further heating treatment, can reduce energy consumption and production costs in production; (2) The content of vehicle urea can be controlled in real time by using flow controllers, thermometers and urea content testers to ensure product quality; (3) The molten urea feeding unit can be flushed in real time by flushing the flushing pipe, which can prevent the molten urea from crystallizing in the pipe after cooling and affecting subsequent use. At the same time, it can also clean the molten urea feed. (4) By modifying the production equipment of automotive urea solution, the original feeding method, which involves first feeding pure water and then urea granules, is combined into a process where urea and pure water are fed through the same equipment. Water is fed through the pure water pipeline and urea is fed through the molten urea pipeline. The two materials are fully mixed during feeding, and the feeding amount is controlled by the flow meter. The content of urea solution is determined by the content testing instrument, so that the urea solution in the mixing tank can meet the enterprise standard requirements. This simplifies the urea production process, expands the source of urea raw materials, and reduces production costs. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the production feeding device for preparing automotive urea from molten urea, as described in Example 1. Detailed Implementation

[0016] The present invention will now be further described in conjunction with specific embodiments and accompanying drawings.

[0017] Example 1: The production feeding device for preparing automotive urea from molten urea described in this example includes a pure water feeding unit, a molten urea feeding unit, a mixing unit, and an automotive urea finished product tank. The pure water feeding unit is used to transport pure water to the mixing unit. The molten urea feeding unit is used to transport molten urea solution to the mixing unit. The mixing unit mixes the pure water and molten urea solution and then transports the mixture to the automotive urea finished product tank. The pure water feeding unit is connected to the molten urea feeding unit through a flushing pipe for flushing residual molten urea.

[0018] like Figure 1 As shown, the pure water feeding unit includes a pure water storage tank 1 and a pure water conveying pipeline connected to the pure water pipeline. The pure water conveying pipeline is equipped with a pure water flow controller 2, which can control the flow rate of the liquid flowing through it and can be connected to a control system to automatically control the flow rate of pure water according to the amount of molten urea. The pure water in the pure water storage tank 1 is production purified pure water with a resistivity ≥18.2MΩ·cm. The pure water conveying pipeline is made of polypropylene.

[0019] The molten urea feeding unit includes a molten urea solution tank truck 8 and a molten urea conveying pipeline connected to the molten urea tank truck. The molten urea conveying pipeline is equipped with a molten urea solution flow controller 6, a thermometer 5, and a molten urea solution urea content tester 7, arranged sequentially according to the flow direction of the molten urea solution. The molten urea solution in the molten urea solution tank truck 8 is the incoming raw material, transported by the tank truck, which is equipped with a pressure pump to discharge the molten urea. The thermometer 5 serves as a temperature monitoring device with a range of 0-100℃ to prevent excessively high molten urea temperatures from damaging the equipment. The molten urea solution urea content tester 7 can test the molten urea content during feeding and automatically determine the amount of pure water to be fed based on the content. The molten urea conveying pipeline is made of stainless steel.

[0020] The mixing unit includes a mixing reactor 3 and a stirring device 4; the stirring device 4 ensures that molten urea and pure water are mixed evenly; the mixing reactor is made of stainless steel.

[0021] The vehicle urea finished product tank 9 is made of fiberglass; the mixing unit is connected to the vehicle urea finished product tank through a pipeline; the pipeline is equipped with a urea content tester 11 in the vehicle urea solution, which can test the content of the vehicle urea solution after mixing, and automatically determine the amount of pure water to flush the pipeline based on the content, so as to ensure that the urea solution content in the storage tank meets the requirements.

[0022] A flushing pipe is provided between the pure water feeding unit and the molten urea feeding unit. The flushing pipe is connected to the molten urea conveying pipe, and a flushing pump 10 is provided on the flushing pipe.

[0023] The working principle of the above device is as follows:

[0024] The mixing reactor 3, serving as a mixing container, consists of two inlets and one outlet. Urea and pure water, the two raw materials for the automotive urea solution, are introduced into the reactor from the pure water tank 1 and the molten urea tank truck 8, respectively. As the molten urea passes through the pipeline, the flow rate controller 6 controls the amount entering the mixing reactor 3. Simultaneously, the urea content tester 7 monitors the molten urea content (70-80%) in real time and automatically calculates the content based on the measured value, converting it to 33.1%. This drives the pure water flow controller 2 to simultaneously add a certain proportion of pure water. The thermometer 5 monitors the temperature during the process to prevent damage to the equipment from high temperatures. Simultaneously with the feeding, the stirring device 4 starts stirring to ensure uniform mixing of the solution. After feeding, stirring is performed for 10 minutes, and the solution is discharged into the finished automotive urea solution storage tank 9. The solution content is measured in the pipeline using the urea content tester 11 (32.8-33.1%), indicating a slightly high urea content. Molten urea solution is prone to precipitation, which can cause blockage of pipelines. Therefore, after the molten urea tanker truck 8 finishes discharging, pure water needs to be introduced through flushing pump 10 to flush the molten urea solution delivery pipeline. The amount of pure water used for flushing is determined based on the content of urea solution in the vehicle urea solution finished product storage tank 9, and the final content of vehicle urea solution is adjusted to 32.5±0.2%.

Claims

1. A production feeding device for preparing automotive urea from molten urea, characterized in that, The system includes a pure water feeding unit, a molten urea feeding unit, a mixing unit, and a vehicle-grade urea finished product tank. The pure water feeding unit is used to transport pure water to the mixing unit. The molten urea feeding unit is used to transport molten urea solution to the mixing unit. The mixing unit mixes the pure water and molten urea solution and then transports the mixture to the vehicle-grade urea finished product tank. The pure water feeding unit is connected to the molten urea feeding unit through a flushing pipe and is used to flush out any residual molten urea.

2. The production feeding device according to claim 1, characterized in that, The pure water feeding unit includes a pure water storage tank and a pure water conveying pipeline connected to a pure water pipeline, and the pure water conveying pipeline is equipped with a flow controller.

3. The production feeding device according to claim 1, characterized in that, The molten urea feeding unit includes a molten urea solution tank truck and a molten urea conveying pipeline connected to the molten urea tank truck. The molten urea conveying pipeline is equipped with a flow controller, a thermometer, and a urea content tester in sequence according to the flow direction of the molten urea solution.

4. The production feeding device according to claim 3, characterized in that, The molten urea conveying pipeline is made of stainless steel.

5. The production feeding device according to claim 1, characterized in that, The mixing unit includes a mixing reactor and a stirring device.

6. The production feeding device according to claim 5, characterized in that, The mixing reactor is made of stainless steel.

7. The production feeding device according to claim 1, characterized in that, The mixing unit is connected to the vehicle urea finished product tank via a pipeline.

8. The production feeding device according to claim 7, characterized in that, The pipeline is equipped with a urea content tester.

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