Adblue purification system

Abstract

The utility model provides a vehicle urea purification system, and relates to the technical field of urea purification, the vehicle urea purification system comprises a desalted water heat exchanger, an EDI system, an EDI wastewater recovery system, a high purity water storage tank, a pipeline mixer, a urine rough preparation tank, a urea solution heat exchanger, a precision filter and a urea solution storage tank, according to the utility model, the precision filter is arranged to filter impurities in the urea solution, so that the impurities in the urea solution are prevented from influencing the chemical activity and the reaction efficiency of the urea solution, the conversion effect of nitrogen oxides in tail gas is improved, and the pollution of the tail gas to the environment is reduced; through cooperation of the pipeline mixer, the urine rough preparation tank and the urea solution heat exchanger, high-purity water and a urea solution with the concentration of 84% are mixed, roughly prepared, cooled and purified to obtain the urea solution meeting the concentration requirement, and crystallization and blockage caused by insufficient purity of the urea solution in a tail gas treatment system of a vehicle are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of urea purification, and in particular to a vehicle urea purification system. Background Art

[0002] Automotive urea is typically added to diesel fuel as a solution or injected into exhaust gases through an injection system. During vehicle operation, the urea solution flows through a specialized catalyst along with the exhaust. When the temperature reaches a certain level, the urea decomposes into ammonia, which reacts with nitrogen oxides in the exhaust gas, converting them into harmless nitrogen and water vapor, thereby reducing exhaust emissions and environmental pollution. The use of automotive urea can reduce diesel vehicle emissions and improve the vehicle's environmental performance, and is widely used in diesel vehicle exhaust treatment systems.

[0003] Industrial urea has a high concentration and cannot be used directly as automotive urea. It needs to be diluted and purified. However, the automotive urea produced by the existing automotive urea purification system has a high impurity content, which will affect its chemical activity and reaction efficiency, reduce the conversion effect of exhaust nitrogen oxides, lead to substandard exhaust emissions, and aggravate environmental pollution. In addition, automotive urea with insufficient purity will form crystals and blockages in the vehicle's exhaust treatment system, damage related components, and increase the vehicle's maintenance costs and failure rate. Therefore, it is necessary to propose a automotive urea purification system to reduce the impurity content in automotive urea and improve the purity of automotive urea. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a vehicle urea purification system, which can solve the technical problems of high impurity content and insufficient purity of vehicle urea produced by existing vehicle urea purification systems.

[0005] An embodiment of the present application provides a vehicle urea purification system, characterized in that it includes a desalted water heat exchanger, an EDI system, an EDI wastewater recovery system, a high-purity water storage tank, a pipeline mixer, a urine coarse preparation tank, a urea solution heat exchanger, a precision filter, a urea solution storage tank, a preparation pipeline, a wastewater recovery pipeline, a urea device, an output pipeline, a distribution main pipeline, a distribution sub-pipeline, a urea solution filling system and a urea loading skid. The desalted water heat exchanger, the EDI system, the high-purity water storage tank, the pipeline mixer, the urine coarse preparation tank, the urea solution heat exchanger, the precision filter and the urea solution storage tank are connected in sequence through a preparation pipeline, wherein the desalted water heat exchanger is externally connected to the desalted water plant network, the EDI system is connected to the EDI wastewater recovery system through a wastewater recovery pipeline, the urea device is connected to the pipeline mixer through an output pipeline, the urea solution storage tank is connected to a distribution main pipeline, and the distribution main pipeline is respectively connected to the urea solution filling system and the urea loading skid through distribution sub-pipes.

[0006] Furthermore, a high-purity water delivery pump is provided on the preparation pipeline between the high-purity water storage tank and the pipeline mixer. Two high-purity water delivery pumps are provided and are arranged in parallel.

[0007] Furthermore, a rough urea solution pump is provided on the preparation pipeline between the urine rough preparation tank and the urea solution heat exchanger. Two rough urea solution pumps are provided and are arranged in parallel.

[0008] Furthermore, two precision filters are provided, and the two precision filters are arranged in parallel.

[0009] Furthermore, a urea solution filter is provided on the distribution main pipeline.

[0010] Furthermore, a urea solution delivery pump is provided on the distribution main pipeline between the urea solution storage tank and the urea solution filter. Two urea solution delivery pumps are provided and are arranged in parallel.

[0011] Furthermore, a return pipe is connected to the preparation pipe between the urea solution heat exchanger and the precision filter, and the return pipe extends into the urine rough preparation tank away from one end of the preparation pipe. An injector is provided in the urine rough preparation tank, and the injector is installed at the end of the flow pipe.

[0012] Furthermore, the return pipe is provided with a density meter for detecting the density of the fluid in the return pipe.

[0013] Furthermore, a curved circulating water pipe is provided in the urea solution storage tank, and a water inlet and a water outlet of the circulating water pipe are both located outside the urea solution storage tank.

[0014] Beneficial effects of the utility model:

[0015] The utility model is provided with a precision filter to filter impurities in the urea solution, so as to prevent the impurities in the urea from affecting its chemical activity and reaction efficiency, improve the conversion effect of exhaust nitrogen oxides, and reduce the pollution of exhaust gas to the environment. Through the cooperation of a pipeline mixer, a urine rough preparation tank, and a urea solution heat exchanger, high-purity water and a urea solution with a concentration of 84% are mixed and roughly prepared, and the temperature is reduced and purified to obtain a urea solution that meets the concentration requirements, so as to prevent the urea solution from being insufficiently pure and forming crystals and blockages in the vehicle's exhaust treatment system, damaging related components, and increasing the maintenance cost and failure rate of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a flowchart of the process in some embodiments of the present application;

[0018] Figure 2 This is a schematic diagram of structural connections in some embodiments of the present application;

[0019] The reference numerals are:

[0020] 1. Desalted water heat exchanger; 2. EDI system; 3. EDI wastewater recovery system; 4. High-purity water storage tank; 5. Pipeline mixer; 6. Urea crude preparation tank; 7. Urea solution heat exchanger; 8. Precision filter; 9. Urea solution storage tank; 10. Preparation pipeline; 11. Desalted water plant network; 12. Wastewater recovery pipeline; 13. Urea device; 14. Output pipeline; 15. Distribution main pipeline; 16. Distribution secondary pipeline; 17. Urea solution filling system; 18. Urea loading skid; 19. High-purity water delivery pump; 20. Crude urea solution pump; 21. Urea solution filter; 22. Urea solution delivery pump; 23. Reflux pipeline; 24. Ejector; 25. Density meter; 26. Circulating water pipe. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0026] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Specific embodiment:

[0028] like Figure 1 and Figure 2As shown, the present application provides a vehicle urea purification system, including a desalted water heat exchanger 1, an EDI system 2, an EDI wastewater recovery system 3, a high-purity water storage tank 4, a pipeline mixer 5, a urine coarse preparation tank 6, a urea solution heat exchanger 7, a precision filter 8, a urea solution storage tank 9, a preparation pipeline 10, a wastewater recovery pipeline 12, a urea device 13, an output pipeline 14, a distribution main pipeline 15, a distribution sub-pipeline 16, a urea solution filling system 17 and a urea loading skid 18. The desalted water heat exchanger 1, the EDI system 2, the high-purity water storage tank 4, the pipeline mixer 5, the urine coarse preparation tank 6, the urea solution heat exchanger 7, the precision filter 8 and the urea solution storage tank 9 are connected in sequence through the preparation pipeline 10, wherein the desalted water heat exchanger 1 is externally connected to the desalted water plant network 11, and the EDI system 2 is connected to the EDI wastewater recovery network through the wastewater recovery pipeline 12. The collection system 3 is connected, the urea device 13 is connected to the pipeline mixer 5 through the output pipe 14, the urea solution storage tank 9 is connected to the distribution main pipe 15, and the distribution main pipe 15 is connected to the urea solution filling system 17 and the urea loading skid 18 through the distribution sub-pipe 16. The impurities in the urea solution are filtered by the precision filter 8 to prevent the impurities in the urea from affecting its chemical activity and reaction efficiency, thereby improving the conversion effect of exhaust nitrogen oxides and reducing the pollution of exhaust gas to the environment. The high-purity water and the urea solution with a concentration of 84% are mixed and roughly prepared by the pipeline mixer 5, the urine rough preparation tank 6 and the urea solution heat exchanger 7, and the urea solution meeting the concentration requirements is obtained by cooling and purification, so as to avoid the formation of crystals and blockages in the vehicle's exhaust treatment system due to insufficient purity of the urea solution, damage to related components, and increase the maintenance cost and failure rate of the vehicle.

[0029] like Figure 2 As shown, a high-purity water delivery pump 19 is provided on the preparation pipeline 10 between the high-purity water storage tank 4 and the pipeline mixer 5. There are two high-purity water delivery pumps 19, which are arranged in parallel. The high-purity water in the high-purity water storage tank 4 is delivered to the pipeline mixer 5 through the high-purity water delivery pump 19. One of the high-purity water delivery pumps 19 is a standby pump. During operation, the two high-purity water delivery pumps 19 are in an open and closed state. Specifically, in order to ensure the safe operation of the high-purity water delivery pumps 19, both sides of the two high-purity water delivery pumps 19 are provided with stop valves on the purification pipe. When one of the high-purity water delivery pumps 19 fails, the stop valves on both sides of the corresponding position of the high-purity water delivery pump 19 are closed, and the other high-purity water delivery pump 19 is started and the stop valves on both sides of its corresponding position are opened. The failed high-purity water delivery pump 19 can be repaired or replaced without affecting the normal operation of the overall system.

[0030] like Figure 2As shown, a rough urea solution pump 20 is provided on the preparation pipeline 10 between the urine rough preparation tank 6 and the urea solution heat exchanger 7. Two rough urea solution pumps 20 are provided, and the two rough urea solution pumps 20 are arranged in parallel. The rough urea solution in the urine rough preparation tank 6 is transported to the urea solution heat exchanger 7 through the rough urea solution pumps 20. One of the rough urea solution pumps 20 is a standby pump. During operation, the two rough urea solution pumps 20 are in an open and closed state. Specifically, in order to ensure the safe operation of the rough urea solution pumps 20, both sides of the two rough urea solution pumps 20 are provided with stop valves on the preparation pipeline 10. When one of the rough urea solution pumps 20 fails, the stop valves on both sides of the corresponding position of the rough urea solution pump 20 are closed, and the other rough urea solution pump 20 is started and the stop valves on both sides of the corresponding position of the other rough urea solution pump 20 are opened. The failed rough urea solution pump 20 can be repaired or replaced without affecting the normal operation of the overall system.

[0031] like Figure 2 As shown, there are two precision filters 8, which are arranged in parallel. When one of the precision filters 8 is a spare filter, the two precision filters 8 are in an open and closed state in the operating state. Specifically, in order to ensure the safe operation of the precision filter 8, both sides of the two coarse precision filters 8 are provided with stop valves on the preparation pipeline 10. When one of the precision filters 8 fails, the stop valves on both sides of the corresponding position of the precision filter 8 are closed, and the other precision filter 8 is enabled and the stop valves on both sides of its corresponding position are opened. The faulty precision filter 8 can be repaired or replaced without affecting the normal operation of the entire system. The stop valves on both sides of the corresponding positions of the two precision filters 8 can also be opened to make the two precision filters 8 in the operating state at the same time, thereby improving the filtration efficiency of the residue impurities in the urea solution.

[0032] like Figure 2 As shown, a urea solution filter 21 is provided on the distribution main pipeline 15 , and the urea solution is further filtered by the urea solution filter 21 to further reduce impurities in the urea solution.

[0033] like Figure 2As shown, a urea solution delivery pump 22 is provided on the distribution main pipe 15 between the urea solution storage tank 9 and the urea solution filter 21. Two urea solution delivery pumps 22 are provided and are arranged in parallel. The urea solution in the urea solution storage tank 9 is delivered to the urea solution filter 21 through the urea solution delivery pumps 22. One of the urea solution delivery pumps 22 is a standby pump. During operation, the two urea solution delivery pumps 22 are in an open and closed state. Specifically, to ensure the safe operation of the urea solution delivery pumps 22, stop valves are provided on both sides of the distribution main pipe 15. When one of the urea solution delivery pumps 22 fails, the stop valves on both sides of the corresponding position of the urea solution delivery pump 22 are closed, and the other urea solution delivery pump 22 is started and the stop valves on both sides of the corresponding position of the other urea solution delivery pump 22 are opened. The failed urea solution delivery pump 22 can be repaired or replaced without affecting the normal operation of the entire system.

[0034] like Figure 2 As shown, the preparation pipe 10 between the urea solution heat exchanger 7 and the precision filter 8 is connected to a return pipe 23. The return pipe 23 extends to the urine rough preparation tank 6 away from one end of the preparation pipe 10. An ejector 24 is provided in the urine rough preparation tank 6. The ejector 24 is installed at the end of the flow pipe. The rough urea solution cooled by the urea solution heat exchanger 7 can be sprayed into the urea solution rough preparation tank through the return pipe 23 and the ejector 24 to mix the urea solution evenly.

[0035] like Figure 2 As shown, the return pipe 23 is provided with a density meter 25 for detecting the density of the fluid in the return pipe 23. The density of the urea solution in the return pipe 23 is detected by the density meter 25, which facilitates the control of the urea density in the urea solution so as to produce a urea solution that meets the required concentration.

[0036] like Figure 2 As shown, a curved circulating water pipe 26 is provided in the urea solution storage tank 9. The water inlet and the water outlet of the circulating water pipe 26 are both located outside the urea solution storage tank 9. By inputting circulating water into the circulating water pipe 26, the temperature of the urea solution in the urea solution storage tank 9 can be controlled, which helps to maintain the stability and quality of the urea solution.

[0037] Working principle:

[0038] The desalted water in the plant enters the desalted water heat exchanger 1 through the desalted water plant network 11. The desalted water at 43°C is cooled to 35°C by circulating water. The cooled desalted water passes through the EDI system 2 to produce high-purity water and wastewater. The wastewater enters the EDI wastewater recovery system 3 through the wastewater recovery pipeline 12 for subsequent recovery and treatment. The high-purity water enters the high-purity water storage tank 4 and is transported to the pipeline mixer 5 through the high-purity water delivery pump 19. The urea solution with a concentration of 84% to 87% produced by the urea device 13 is input into the pipeline mixer 5 through the output pipe. The high-purity water in the pipeline mixer 5 is mixed with the urea solution with a concentration of 84% to 87% to form a urea solution with a concentration of 31.8 to 33.2% and a density of 1087.0 to 1093.0 kg / m 3 The urea solution enters the crude urea solution tank. The urea solution in the crude urea solution tank flows through the crude urea solution pump 20 and enters the urea solution heat exchanger 7, where the circulating water cools the urea solution to 35°C. The cooled urea solution is filtered through a precision filter 8 to remove impurities, resulting in a finished product with a concentration that meets the requirements. The finished product enters the urea solution storage tank 9 for storage. The finished automotive urea solution is then delivered to the urea loading skid 18 via a urea solution delivery pump 22 and a urea solution filter 21, where it is loaded into tank trucks for external sale or into the urea solution filling system 17 for small-package barrels for external sale.

[0039] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A vehicle urea purification system, characterized in that: The system comprises a desalted water heat exchanger, an EDI system, an EDI wastewater recovery system, a high-purity water storage tank, a pipeline mixer, a urine rough preparation tank, a urea solution heat exchanger, a precision filter, a urea solution storage tank, a preparation pipeline, a wastewater recovery pipeline, a urea device, an output pipeline, a distribution main pipeline, a distribution sub-pipeline, a urea solution filling system and a urea loading skid. The desalted water heat exchanger, the EDI system, the high-purity water storage tank, the pipeline mixer, the urine rough preparation tank, the urea solution heat exchanger, the precision filter and the urea solution storage tank are connected in sequence through the preparation pipeline, wherein the desalted water heat exchanger is externally connected to the desalted water plant area pipeline network, the EDI system is connected to the EDI wastewater recovery system through a wastewater recovery pipeline, the urea device is connected to the pipeline mixer through an output pipeline, the urea solution storage tank is connected to a distribution main pipeline, and the distribution main pipeline is respectively connected to the urea solution filling system and the urea loading skid through distribution sub-pipelines.

2. A vehicle urea purification system according to claim 1, characterized in that: A high-purity water delivery pump is provided on the preparation pipeline between the high-purity water storage tank and the pipeline mixer. Two high-purity water delivery pumps are provided and the two high-purity water delivery pumps are arranged in parallel.

3. The vehicle urea purification system according to claim 1, characterized in that: A rough urea solution pump is provided on the preparation pipeline between the urine rough preparation tank and the urea solution heat exchanger. Two rough urea solution pumps are provided and the two rough urea solution pumps are arranged in parallel.

4. The vehicle urea purification system according to claim 1, characterized in that: There are two precision filters, and the two precision filters are arranged in parallel.

5. The vehicle urea purification system according to claim 1, characterized in that: The distribution main pipeline is provided with a urea solution filter.

6. A vehicle urea purification system according to claim 5, characterized in that: A urea solution delivery pump is provided on the distribution main pipeline between the urea solution storage tank and the urea solution filter. Two urea solution delivery pumps are provided and the two urea solution delivery pumps are arranged in parallel.

7. The vehicle urea purification system according to claim 1, characterized in that: The preparation pipeline between the urea solution heat exchanger and the precision filter is connected with a return pipeline, and the return pipeline extends into the urine rough preparation tank away from one end of the preparation pipeline. An ejector is arranged in the urine rough preparation tank, and the ejector is installed at the end of the flow pipeline.

8. A vehicle urea purification system according to claim 7, characterized in that: The return pipe is provided with a density meter for detecting the density of the fluid in the return pipe.

9. A vehicle urea purification system according to claim 8, characterized in that: A curved circulating water pipe is arranged in the urea solution storage tank, and a water inlet and a water outlet of the circulating water pipe are both located outside the urea solution storage tank.

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