Feeding and dissolving integrated urea solution preparation system

Abstract

The utility model relates to a feeding and dissolving integrated urea solution preparation system which comprises an annular jet device and a urea solution preparation tank, the annular jet device comprises a suction pipe and a mixing pipe, and the mixing pipe comprises a bent pipe section and a suction section. The suction pipe penetrates through the side wall of the outer arc of the bent pipe section, the suction end of the suction pipe is located outside the bent pipe section and connected with urea particles, and the discharge end of the suction pipe is located in the suction section. An annular jet orifice is formed between the suction pipe and the suction section and located on the outer side of the discharging end of the suction pipe. The suction section and the bent pipe section are both connected with a urea solution preparation tank, and a jet pump is arranged on a jet pipeline connected with the bent pipe section and the urea solution preparation tank. The urea solution preparation tank is further connected with a discharging pipeline, a first outlet of the discharging pipeline is connected to the urea solution preparation tank through a backflow pipeline, a second outlet of the discharging pipeline is connected to the urea solution storage tank through a liquid outlet pipeline, and the device has the advantages that manpower input is reduced, and the solubility is improved, so that the efficiency and the concentration accuracy are improved.

Description

Technical Field

[0001] This utility model relates to the field of urea solution preparation, and more specifically, to a urea solution preparation system that integrates feeding and dissolving. Background Technology

[0002] Common reducing agents for flue gas denitrification include liquid ammonia, ammonia water, and urea. Compared with the former two, which have certain risks, urea is chemically stable, non-toxic, has low risk, and is convenient to transport and store. Currently, the country is promoting the replacement of liquid ammonia and ammonia water with urea to reduce the sources of danger in power plants. Therefore, urea will be used more and more as the preferred denitrification reducing agent in the future.

[0003] Purchased urea is usually in granular form and, for ease of transportation, is mostly packaged in bags. However, denitrification typically requires a urea solution with a concentration of 40-50%, which necessitates dissolving the urea granules to prepare the solution.

[0004] The existing urea solution preparation process is as follows: First, a certain amount of demineralized water is injected into the urea solution preparation tank, and the demineralized water is heated to 40-50℃ by steam heating; the stirring device is turned on, and bagged urea is manually transported to the bucket elevator, the bags are broken and poured into the hopper, and the bucket elevator conveys it to the urea solution preparation tank for dissolution; during this period, depending on the solution temperature, feeding needs to be paused and the temperature needs to rise to a suitable level before feeding can continue; when the amount of urea added initially reaches the set value, the unloading pump is started for internal circulation, and the urea concentration is detected by a densitometer; the urea solution concentration is adjusted to about 50% of the designed concentration by adjusting the amount of urea fed or the amount of demineralized water; the circulation valve is closed to stop circulation, and the conveying valve is opened to convey the urea solution to the urea solution storage tank for use.

[0005] This requires a lot of manpower and resources to handle urea, which is time-consuming and labor-intensive. Furthermore, the urea particles cannot be mixed quickly, resulting in a long preparation time for urea solution. During the preparation process, the urea particles are prone to incomplete dissolution, leading to inaccurate solution concentration, caking, corrosion, and the release of a large amount of ammonia odor, resulting in a poor working environment. Utility Model Content

[0006] The purpose of this invention is to provide an integrated urea solution preparation system that combines feeding and dissolving, thereby reducing the manual labor required in the urea solution preparation process, facilitating rapid urea dissolution, reducing the probability of equipment caking and corrosion, and improving the solubility of urea particles, thus improving preparation efficiency and concentration accuracy.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0008] This utility model provides a urea solution preparation system integrating feeding and dissolution, which includes an annular ejector, the annular ejector including a suction pipe and a mixing pipe, the mixing pipe including a curved section and a suction section;

[0009] The suction pipe passes through the side wall of the outer arc of the bend section. The suction end of the suction pipe is located outside the bend section and connected to urea particles. The discharge end of the suction pipe is located inside the suction section.

[0010] The diameter of the suction section gradually decreases from the large end to the small end. The large end of the suction section is connected to one end of the bend section. The small end of the suction section and the other end of the bend section away from the suction section are both connected to the urea solution preparation tank. A jet pump is provided on the jet pipeline connecting the bend section and the urea solution preparation tank.

[0011] The suction pipe and the suction section are arranged coaxially, and an annular injection port is formed between the suction pipe and the suction section. The injection port is located outside the discharge end of the suction pipe.

[0012] In some embodiments of this application, the diameter of the suction section gradually decreases from the large end to the small end, the large end of the suction section is connected to one end of the bend section, and the small end of the suction section is connected to the urea solution preparation tank.

[0013] In some embodiments of this application, the mixing tube further includes a throat segment and a diffuser segment;

[0014] The throat section is a straight pipe with a constant diameter, and the diameter of the diffuser section gradually increases from the small end to the large end.

[0015] One end of the larynx segment is connected to the small end of the inhalation segment, and the other end of the larynx segment is connected to the small end of the diffusion segment;

[0016] The larger end of the diffusion section is connected to the urea solution preparation tank.

[0017] In some embodiments of this application, the mixing pipe further includes a water supply section and a water outlet section;

[0018] Both the water supply section and the water outlet section are straight pipes with equal diameter.

[0019] One end of the water supply section is connected to the other end of the bend section away from the suction section, and one end of the water outlet section is connected to the large end of the diffuser section;

[0020] The other end of the water supply section away from the bend section and the other end of the water outlet section away from the diffuser section are both connected to the urea solution preparation tank, and the urea solution in the water outlet section enters the urea solution preparation tank tangentially.

[0021] In some embodiments of this application, the liquid flow velocity at the injection nozzle is 20–50 m / s.

[0022] In some embodiments of this application, a level gauge is provided inside the urea solution preparation tank.

[0023] In some embodiments of this application, the urea solution preparation tank is further connected to an inlet pipeline, and an inlet valve is provided on the inlet pipeline.

[0024] In some embodiments of this application, the jet pump, the level gauge, the unloading pump, the reflux valve, the outlet valve, and the inlet valve are all connected to the controller.

[0025] In some embodiments of this application, the urea solution preparation tank is further equipped with a heater and a thermometer.

[0026] In some embodiments of this application, the bending arc of the pipe section is greater than 0 degrees and less than 180 degrees.

[0027] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects:

[0028] In this embodiment of the integrated urea solution preparation system for feeding and dissolving, hot water with hydrophobic properties can be used as the solvent. Hot water is first placed in the urea solution preparation tank, and the jet pump is turned on. The high-pressure solution generated by the jet pump passes through an annular jet injector. The high-pressure solution first enters the curved section, and guided by the pipe wall of the curved section, it enters the suction section. The high-pressure solution is ejected from the annular nozzle, creating a vacuum at the outlet end of the suction pipe, thereby generating a strong suction force. This suction force can be used to directly draw urea particles into the suction pipe. The annular jet injector's suction capacity allows for direct feeding of urea particles, significantly reducing urea handling work. The annular jet injector enables immediate dissolution upon feeding, eliminating the need for cumbersome preparation steps and greatly reducing preparation time. Because the circulating solution volume is several times or even ten times the volume of urea particles, the solution inside the annular jet injector and urea particles can dissolve in real time, preventing incomplete dissolution and reducing caking and corrosion problems, as well as the generation of ammonia odor. The unloading pump and reflux valve are turned on, and the urea solution is refluxed. The urea solution concentration meter is used to detect whether the urea solution concentration has reached the set value. When the solution concentration reaches the set value, the jet pump is interlocked and shut down to stop feeding. The reflux valve is closed and the outlet valve is opened to deliver qualified urea solution to the urea solution storage tank. When the urea solution concentration does not reach the set value, the annular jet pump continues to draw urea particles, dissolve urea, and increase the urea solution concentration to ensure that the urea solution concentration accurately meets the standard. Attached Figure Description

[0029] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein:

[0030] Figure 1 This is a schematic diagram of the structure of a urea solution preparation system integrating feeding and dissolution according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the annular jet injector.

[0032] Figure 3 This is a schematic diagram of the structure of a urea solution preparation system integrating feeding and dissolution according to another embodiment of the present invention.

[0033] The reference numerals in the attached diagrams are explained as follows: 1. Annular jet injector; 11. Suction pipe; 12. Mixing pipe; 121. Bend section; 122. Suction section; 123. Throat section; 124. Diffusion section; 125. Water supply section; 126. Water outlet section; 2. Urea solution preparation tank; 21. Level gauge; 22. Heater; 23. Thermometer; 31. Jet pipeline; 32. Jet pump; 41. Discharge pipeline; 42. Discharge pump; 43. Urea solution concentration meter; 51. Return pipeline; 52. Return valve; 61. Discharge pipeline; 62. Discharge valve; 71. Inlet pipeline; 72. Inlet valve; 8. Controller. Detailed Implementation

[0034] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0035] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0036] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0037] Please see Figure 1 and Figure 2The integrated feeding and dissolving urea solution preparation system provided in one embodiment of the present invention includes an annular jet injector 1 and a urea solution preparation tank 2. The annular jet injector 1 includes a suction pipe 11 and a mixing pipe 12 connected to each other. The mixing pipe 12 includes a bent section 121 and a suction section 122.

[0038] The suction pipe 11 is installed on the side wall of the outer arc of the bend section 121. The suction end of the suction pipe 11 is located outside the bend section 121 and connected to the urea particles. The discharge end of the suction pipe 11 is located inside the suction section 122.

[0039] The suction pipe 11 and the suction section 122 are arranged coaxially, and an annular injection port is formed between the suction pipe 11 and the suction section 122. The injection port is located outside the discharge end of the suction pipe 11.

[0040] The end of the suction section 122 away from the bend section 121 and the end of the bend section 121 away from the suction section 122 are both connected to the urea solution preparation tank 2, and a jet pump 32 is provided on the jet pipeline 31 connecting the bend section 121 and the urea solution preparation tank 2.

[0041] The urea solution preparation tank 2 is also connected to a discharge pipeline 41. The first outlet of the discharge pipeline 41 is connected to the urea solution preparation tank 2 via a return pipeline 51, and the second outlet of the discharge pipeline 41 is connected to the urea solution storage tank via a liquid outlet pipeline 61. A discharge pump 42 and a urea solution concentration meter 43 are sequentially installed on the discharge pipeline 41, a return valve 52 is installed on the return pipeline 51, and a liquid outlet valve 62 is installed on the liquid outlet pipeline 61.

[0042] Hot water with hydrophobic properties can be used as a solvent. First, hot water is placed into the urea solution preparation tank 2, and the jet pump 32 is turned on. The high-pressure solution generated by the jet pump 32 passes through the annular jet nozzle 1. The high-pressure solution first enters the bent pipe section 121. Under the guidance of the pipe wall of the bent pipe section 121, the high-pressure solution enters the suction section 122. The high-pressure solution is ejected from the annular nozzle, forming a vacuum at the discharge end of the suction pipe 11, thereby generating a strong suction force. Using this suction force, urea particles can be directly sucked into the suction pipe 11. By using the suction capacity of the annular jet nozzle 1, urea particles can be directly sucked and fed, greatly reducing the urea handling work.

[0043] The annular jet injector 1 can achieve immediate dissolution upon feeding, eliminating the need for cumbersome preparation steps and significantly reducing preparation time. Since the circulating solution volume is several times or even more than ten times the volume of urea particles, the solution inside the annular jet injector 1 can achieve real-time dissolution of urea particles without incomplete dissolution, thereby reducing caking and corrosion problems and lowering the generation of ammonia odor. The concentration of urea solution can be monitored in real time to ensure that the urea solution concentration is accurately within the standard.

[0044] The discharge pump 42 provides driving force to drive the urea solution in the urea solution preparation tank 2 to flow out through the discharge pipeline 41. Both the reflux valve 52 and the outlet valve 62 are regulating valves. The reflux valve 52 can open or close the reflux pipeline 51 and adjust its flow rate. The outlet valve 62 can open or close the outlet pipeline 61 and adjust its flow rate. A urea solution concentration meter 43 and the reflux valve 52 are installed to effectively monitor the urea solution concentration in real time. Once the concentration reaches the target, feeding can be stopped.

[0045] The diameter of the suction section 122 gradually decreases from its large end to its small end. The large end of the suction section 122 is connected to one end of the bend section 121, and the small end of the suction section 122 and the other end of the bend section 121 away from the suction section 122 are both connected to the urea solution preparation tank 2.

[0046] As the diameter of the suction section 122 gradually decreases from the large end to the small end, the high-pressure solution collides with the pipe wall of the suction section 122 during the process of passing through the large end to the small end of the suction section 122, generating an annular water curtain that gathers towards the center of the suction section 122. The urea particles come into contact with the annular water curtain and achieve rapid dissolution. Moreover, the water curtain can make the urea particles dissolve more completely, improve the mixing effect, and facilitate the precise control of the solution concentration.

[0047] Furthermore, guided by the pipe wall of the bend section 121, the flow direction of the high-pressure solution is changed, making the flow direction of the high-pressure solution the same as that of the urea particles in the suction pipe 11. This facilitates the rapid flow of the mixed urea solution into the urea solution preparation tank 2, improving preparation efficiency. The urea solution in the urea solution preparation tank 2 is then driven by the jet pump 32 to re-enter the annular jet injector 1 for mixing. This cycle continuously dissolves the urea particles in hot water, forming a urea solution that meets the solubility requirements.

[0048] In related technologies, a Venturi injector is used for feeding and mixing urea granules. However, the mixing effect of the Venturi injector is not good, making it difficult to achieve immediate dissolution of the urea granules. The annular jet injector 1 provided by this utility model can improve the mixing effect of urea granules and achieve immediate dissolution of urea granules upon feeding.

[0049] The mixing tube 12 also includes a throat section 123 and a diffuser section 124. The throat section 123 is a straight tube with a constant diameter. The diameter of the diffuser section 124 gradually increases from the small end to the large end. One end of the throat section 123 is connected to the small end of the suction section 122, and the other end of the throat section 123 is connected to the small end of the diffuser section 124. The large end of the diffuser section 124 is connected to the urea solution preparation tank 2.

[0050] The urea mixture enters the throat section 123 from the suction tube 11. The flow rate is stabilized and further mixed in the throat section 123. Then it enters the diffusion section 124. The urea mixture generates turbulence in the diffusion section 124, which can dissolve the urea particles again and further improve the solubility of the urea particles.

[0051] The mixing pipe 12 also includes a water supply section 125 and a water outlet section 126. Both the water supply section 125 and the water outlet section 126 are straight pipes with equal diameter. One end of the water supply section 125 is connected to the other end of the bend section 121 away from the suction section 122. One end of the water outlet section 126 is connected to the large end of the diffuser section 124. The other ends of the water supply section 125 away from the bend section 121 and the other ends of the water outlet section 126 away from the diffuser section 124 are both connected to the urea solution preparation tank 2. The urea solution in the water outlet section 126 enters the urea solution preparation tank 2 tangentially.

[0052] The water supply section 125 is a straight pipe with a constant diameter, which facilitates the connection between the jet pipe 31 and the water supply section 125. The hot water / urea solution in the urea solution preparation tank 2 can enter the annular jet injector 1 through the jet pipe 31 under the drive of the jet pump 32.

[0053] The outlet section 126 is a straight pipe with a constant diameter. The annular jet 1 is directly connected to the urea solution preparation tank 2 through the outlet section 126. The urea solution, after being further dissolved by turbulence in the diffusion section 124, enters the outlet section 126. After the flow rate is stabilized at the outlet end and further mixed and dissolved, it enters the urea solution preparation tank 2.

[0054] It is understood that the mixing pipe 12 includes a water supply section 125, a bend section 121, a suction section 122, a throat section 123, a diffuser section 124, and a water outlet section 126 connected in sequence. The hot water / urea solution in the urea solution preparation tank 2 enters the water supply section 125 through the jet pipe 31 under the drive of the jet pump 32. Under the guidance of the pipe wall of the bend section 121, the flow direction of the solution is changed to the suction section 122. When it is sprayed out at the annular nozzle, a vacuum negative pressure is generated at the discharge end of the suction pipe 11 to suck up urea particles. The hot water / urea solution collides with the pipe wall of the suction section 122, generating an annular water curtain that gathers towards the center of the suction section 122. The urea particles come into contact with the annular water curtain and achieve rapid dissolution. They are then mixed through the throat section 123 and finally enter the urea solution preparation tank 2 through the diffuser and the water outlet pipe.

[0055] In this embodiment, the bending arc of the bend section 121 is greater than 0 degrees and less than 180 degrees, so that the hot water / urea solution can change its flow direction within the bend section 121 while maintaining its flow rate.

[0056] The urea solution preparation tank 2 is equipped with a level gauge 21, which can be used to measure the liquid level in the urea solution preparation tank 2.

[0057] The urea solution preparation tank 2 is also connected to an inlet pipe 71, which is equipped with an inlet valve 72. The inlet pipe 71 can be used to connect hot water from the plant area. The inlet valve 72 is a regulating valve that can open or close the inlet pipe 71 and adjust the flow rate of the inlet pipe 71.

[0058] The working process of the integrated feeding and dissolving urea solution preparation system is described in detail with reference to the above embodiments.

[0059] Step 1: Open the inlet valve 72, add hot water into the urea solution preparation tank 2, and track the liquid level gauge 21 in the urea solution preparation tank 2. When the liquid level reaches the set value, close the inlet valve 72 to stop adding hot water.

[0060] Step 2: Turn on the jet pump 32. The high-pressure hot water forms a high negative pressure at the annular jet nozzle 1 and creates a suction force on the suction pipe 11. Connect the suction pipe 11 and insert it into the bagged urea granules. The urea granules will be drawn and transported to the annular jet nozzle 1, where they will come into contact with the water curtain formed by the hot water and dissolve quickly to form a urea solution.

[0061] Step 3: When the annular jet ejector 1 has been running for a period of time and the amount of urea granules drawn has basically reached the set amount, the unloading pump 42 and the reflux valve 52 are turned on, and the urea solution is refluxed. The urea solution concentration meter 43 is used to detect whether the urea solution concentration has reached the set value. When the solution concentration reaches the set value, the jet pump 32 is interlocked and shut down to stop feeding, and the reflux valve 52 is closed. The liquid outlet valve 62 is opened to deliver qualified urea solution to the urea solution storage tank. When the urea solution concentration has not reached the set value, the annular jet ejector 1 continues to draw urea granules, dissolve urea, and increase the urea solution concentration.

[0062] Step 4: When the level gauge 21 on the urea solution preparation tank 2 reaches the lowest level, the unloading pump 42 is stopped by interlock and the outlet valve 62 is closed.

[0063] The jet pump 32, level gauge 21, unloading pump 42, reflux valve 52, outlet valve 62, and inlet valve 72 are all connected to the controller 8. The controller 8 enables automatic interlocking control of the aforementioned valves, equipment, and instruments, significantly reducing manual operation while ensuring accurate concentration.

[0064] Please see Figure 3 In other embodiments, the urea solution preparation tank 2 is also equipped with a heater 22 and a thermometer 23. If the plant has no hot water but only room temperature demineralized water, the inlet pipe 71 can be connected to the plant's room temperature demineralized water. In this case, the original step 1 needs to be modified by turning on the heater 22 to heat the room temperature demineralized water to the set temperature value. The temperature is monitored by the thermometer 23, and subsequent steps 2, 3, and 4 can be performed after the temperature reaches the set value. The heater 22 can be a steam heater 22 or an electric heater 22.

[0065] The integrated urea solution preparation system for feeding and dissolving provided in this application has at least the following advantages: 1. The feeding and urea solution preparation are integrated, which can effectively solve the problems of complex, time-consuming and labor-intensive feeding in the past; 2. The urea solution preparation speed is fast, which greatly reduces the cumbersome process of urea solution preparation; 3. It solves the problems of incomplete dissolution of urea particles, such as caking, blockage and corrosion; 4. The system has a high degree of automation and the concentration of urea solution can be precisely controlled; 5. The system is simple, efficient and has low investment and maintenance costs.

[0066] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A urea solution production system integrated with feeding and dissolving, characterized in that, The device comprises a circular jet flow device and a urea solution preparation tank, the circular jet flow device comprises a suction pipe and a mixing pipe connected with each other, and the mixing pipe comprises a bend pipe section and a suction section; the suction pipe is arranged through the side wall of the outer arc of the bend pipe section, the suction end of the suction pipe is located outside the bend pipe section and connected with urea particles, and the discharge end of the suction pipe is located inside the suction section; the suction pipe and the suction section are coaxially arranged, and an annular jet port is formed between the suction pipe and the suction section, the jet port is located outside the discharge end of the suction pipe; the end of the suction section away from the bend pipe section and the end of the bend pipe section away from the suction section are both connected with the urea solution preparation tank, and a jet flow pump is arranged on the jet flow pipeline connected with the bend pipe section and the urea solution preparation tank; the urea solution preparation tank is further connected with a discharge pipeline, a first outlet of the discharge pipeline is connected with the urea solution preparation tank through a return pipeline, a second outlet of the discharge pipeline is connected with a urea solution storage tank through a liquid outlet pipeline, a discharge pump and a urea solution concentration meter are arranged on the discharge pipeline in sequence, a return valve is arranged on the return pipeline, and a liquid outlet valve is arranged on the liquid outlet pipeline.

2. The integrated urea solution preparation system of claim 1, wherein, the pipe diameter of the suction section gradually decreases from the large end to the small end, the large end of the suction section is connected with one end of the bend pipe section, and the small end of the suction section is connected with the urea solution preparation tank.

3. The integrated urea solution preparation system of claim 2, wherein, the mixing pipe further comprises a throat pipe section and a diffusion section; the throat pipe section is a straight pipe with an equal diameter structure, and the pipe diameter of the diffusion section gradually increases from the small end to the large end; one end of the throat pipe section is connected with the small end of the suction section, and the other end of the throat pipe section is connected with the small end of the diffusion section; the large end of the diffusion section is connected with the urea solution preparation tank.

4. The integrated urea solution preparation system of claim 3, wherein, the mixing pipe further comprises a water supply section and a water outlet section; the water supply section and the water outlet section are both straight pipes with an equal diameter structure; one end of the water supply section is connected with the other end of the bend pipe section away from the suction section, and one end of the water outlet section is connected with the large end of the diffusion section; the other end of the water supply section away from the bend pipe section and the other end of the water outlet section away from the diffusion section are both connected with the urea solution preparation tank, and the urea solution in the water outlet section enters the urea solution preparation tank tangentially.

5. The urea solution production system integrated with material dissolution according to claim 1, characterized by, the liquid flow rate of the jet port is 20-50 m / s.

6. The integrated urea solution preparation system of claim 1, wherein, a liquid level meter is arranged in the urea solution preparation tank.

7. The integrated urea solution preparation system of claim 6, wherein the urea solution preparation system further comprises a urea solution preparation unit configured to prepare a urea solution by dissolving urea in water. the urea solution preparation tank is further connected with a liquid inlet pipeline, and a liquid inlet valve is arranged on the liquid inlet pipeline.

8. The integrated urea solution preparation system of claim 7, wherein the urea solution preparation system further comprises a urea solution preparation unit configured to prepare a urea solution by dissolving urea in water, and a urea solution storage unit configured to store the urea solution prepared by the urea solution preparation unit. the jet flow pump, the liquid level meter, the discharge pump, the return valve, the liquid outlet valve and the liquid inlet valve are all connected with a controller.

9. The integrated urea solution preparation system of claim 1, wherein, a heater and a thermometer are further arranged in the urea solution preparation tank.

10. The integrated urea solution preparation system of claim 1, wherein, the bending arc of the bend pipe section is greater than 0 degrees and less than 180 degrees.

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