Chemical adding system for urea hydrolyzer cleaning
By designing a dosing system for cleaning urea hydrolyzers, and utilizing components such as a mixing tank, a filter box, and a mixing pipe, uniform mixing and dispersion of the chemical solution were achieved, solving the problem of uneven chemical solution concentration and improving the cleaning effect and equipment operation stability.
Patent Information
- Application Number
- CN202423152696.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In existing chemical dosing systems for cleaning urea hydrolyzers, the chemical solution cannot be added evenly, resulting in uneven chemical concentrations at different locations within the urea hydrolyzer and affecting the cleaning effect.
A dosing system for cleaning a urea hydrolyzer was designed, including a cleaning solution preparation device and a mixing device. The system uses components such as a stirring tank, a filter box, a mixing pipe and a dosing pump to achieve uniform mixing and dispersed injection of the cleaning solution.
This method achieves uniform distribution of the cleaning solution within the urea hydrolyzer, improving the cleaning effect, avoiding scaling and clogging problems, and reducing operating costs.
Smart Images
Figure CN223586951U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of dosing facilities, and particularly relates to a dosing system for cleaning a urea hydrolyzer. BACKGROUND
[0002] The urea hydrolyzer is used for urea hydrolysis process, and a urea solution with a concentration of about 50% is pumped into the hydrolysis reactor by a booster pump, and under the conditions of a pressure of 0.4-0.5 MPa and a temperature of 135-160 DEG C, a mixed gas of ammonia and carbon dioxide is formed under the catalysis of a catalyst, and after steam-water separation, the mixed gas enters an SCR reactor to perform a denitration reaction. The urea hydrolysis reaction in the urea hydrolyzer is a reversible reaction, and when the temperature or the required ammonia amount fluctuates during the hydrolysis reaction process, the product gas condenses to form an ammonium carbamate intermediate under low temperature conditions, which corrodes the pipeline and components, and further water loss forms urea crystals, resulting in fouling of the system, further increasing the fouling resistance of the heat exchange pipe, reducing the heat transfer coefficient, and reducing the load of the device. If not cleaned in time, the entire pipeline system may be blocked, which seriously affects the operation of the device.
[0003] Unlike the time-consuming and high-cost defects of the traditional disassembly cleaning method, the non-disassembly cleaning method, easy operation, and low cost gradually become the mainstream cleaning method of the urea hydrolyzer. During non-disassembly cleaning, the cleaning liquid is injected into the interior of the urea hydrolyzer, and through the decomposition, chelation, and penetration between the cleaning liquid and the fouling, the stripping of the fouling is promoted. In the prior art, the cleaning liquid is added to the urea hydrolyzer by the dosing device, and the following disadvantages exist: the cleaning liquid cannot be uniformly added to the urea hydrolyzer, resulting in uneven cleaning liquid concentration at different positions in the urea hydrolyzer, which affects the cleaning effect. In summary, a new type of dosing system for cleaning a urea hydrolyzer needs to be developed and designed to solve the foregoing technical problems. UTILITY MODEL CONTENTS
[0004] The utility model aims to provide a dosing system for cleaning a urea hydrolyzer, which can add cleaning liquid to the urea hydrolyzer in a relatively uniform manner, and make the cleaning liquid concentration at different positions in the urea hydrolyzer relatively balanced.
[0005] The utility model discloses a technical scheme that is adopted: a dosing system for cleaning urea hydrolyzer, which comprises a cleaning liquid preparation device and a mixed flow device.
[0006] Preferably, the stirring assembly comprises a stirring motor fixedly installed on the top of the stirring tank and a stirring shaft and a stirring impeller located in the stirring tank, and a coupling is used to connect the upper end of the stirring shaft and the output shaft of the stirring motor.
[0007] Preferably, the cleaning liquid preparation device further comprises a filter box, the filter box comprises a filter box body and a filter screen installed inside, and the filter box is connected with the stirring tank through a circulating pipeline, and a circulating pump is installed on the circulating pipeline.
[0008] Preferably, a blowdown port with a manual valve is further arranged on the top of the filter box body of the filter box, and a reverse flushing port is arranged on the bottom of the filter box body, and the reverse flushing port is connected with the water supply pipeline through a reverse flushing pipeline.
[0009] Preferably, an inner base is installed on the inner wall of the mixed flow pipeline, and the inner support is fixedly connected with the inner base, and a stabilizing sleeve frame is further arranged in the middle of each wave-shaped plate, the stabilizing sleeve frame is in the shape of a pipe sleeve, the outer diameter of the stabilizing sleeve frame is equal to the inner diameter of the mixed flow pipeline, a fixed plate is arranged on the inner wall of the stabilizing sleeve frame, and the edges of each wave-shaped plate are fixedly connected with the fixed plate.
[0010] Preferably, a flushing water port is arranged on the top of the rear part of the mixed flow pipeline, and a blowdown pipe with a blowdown gate valve is arranged on the bottom of the front part of the mixed flow pipeline.
[0011] Preferably, two dosing pumps are arranged, one of which is used as a backup, and the mixed flow device has two shunt dosing pipes, and the outlets of the two dosing pumps are respectively connected with the two shunt dosing pipes through conveying pipelines.
[0012] Preferably, a liquid level display is installed on the side wall of the stirring tank, and the liquid level display comprises a liquid level tube with scales, and the upper end and the lower end of the liquid level tube are connected with the inner cavity of the stirring tank through connecting pipes.
[0013] Preferably, the prying base is further provided with a front support installed at the front of the prying base, a rear support installed at the rear of the prying base, a stirring tank fixedly installed at the middle of the prying base, a dosing pump fixedly installed on the front support, and a mixing device fixedly installed on the rear support.
[0014] The utility model discloses the advantages and positive effects are:
[0015] The utility model provides a kind of dosing system for urea hydrolyzer cleaning, compared with prior dosing equipment, the dosing system of the utility model is provided with cleaning liquid preparation device, powder can be prepared into cleaning liquid, it is easy to be filled into urea hydrolyzer. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is the front structure schematic diagram of the utility model;
[0017] Figure 2 It is the three-dimensional structure schematic diagram of the main part of the utility model;
[0018] Figure 3 It is Figure 1 The front perspective structure schematic diagram of mixing device.
[0019] In the drawing:
[0020] 1, water supply pipeline; 2, prying base; 3, rear support; 4, mixing device; 4-1, water inlet pipe; 4-2, cover plate; 4-3, flange plate; 4-4, adapter; 4-5, shunt dosing pipe; 4-6, wave-shaped plate; 4-7, stabilizing sleeve; 4-8, flushing water outlet; 4-9, inner base; 4-10, inner support; 4-11, mixing pipeline; 4-12, blowdown pipe; 4-13, blowdown gate valve; 5, stirring tank; 6, conveying pipeline; 7, stirring assembly; 8, liquid level indicator; 9, control box; 10, front support; 11, dosing pump; 12, filter box; 13, circulating pipeline; 14, reverse flushing pipeline; 15, powder dosing port. DETAILED DESCRIPTION
[0021] To further understand the invention content, characteristics and efficacy of the utility model, the following examples are described in detail.
[0022] Please see Figure 1 AndFigure 2 The utility model discloses a dosing system for urea hydrolyzer cleaning, comprising a cleaning liquid preparation device and a mixing device. The cleaning liquid preparation device is used to prepare powder into cleaning liquid for input into the urea hydrolyzer, and the mixing device is used to promote the mixing between cleaning water and cleaning liquid and improve uniformity.
[0023] As shown in the figure, the cleaning liquid preparation device comprises a stirring tank 5, a powder dosing port 15 and a stirring assembly 7 are arranged on the top of the stirring tank 5, water inlets are arranged on the top wall and the bottom wall of the stirring tank 5, and a water supply pipeline 1 is connected with the upper and lower water inlets of the stirring tank 5. The water supply pipeline 1 divides the water source into two paths to input into the stirring tank 5 from the upper and lower parts of the stirring tank 5, thereby promoting internal mixing.
[0024] In the embodiment, a liquid level display 8 is installed on the side wall of the stirring tank 5, the liquid level display 8 comprises a liquid level tube with scales, the upper end and the lower end of the liquid level tube are connected with the inner cavity of the stirring tank 5 through connecting pipes, and the liquid level display 8 is arranged to display the liquid level of the cleaning liquid in the stirring tank 5.
[0025] In the embodiment, the stirring assembly 7 comprises a stirring motor fixed on the top of the stirring tank 5, a stirring shaft and a stirring impeller arranged in the stirring tank 5, and a coupling is arranged between the upper end of the stirring shaft and the output shaft of the stirring motor.
[0026] In the embodiment, the cleaning liquid preparation device further comprises a filter box 12, the filter box 12 comprises a filter box body and a filter screen arranged inside, the filter box 12 is connected with the stirring tank 5 through a circulating pipeline, and a circulating pump is arranged on the circulating pipeline. Specifically, one end of the circulating pipeline penetrates through the top wall of the stirring tank 5 and the port is located at the top of the inner cavity of the stirring tank 5, the other end of the circulating pipeline penetrates through the top wall of the stirring tank 5 and the port is located at the bottom of the inner cavity of the stirring tank 5, when the circulating pump operates, the cleaning liquid in the stirring tank 5 is extracted from the bottom, enters the filter box 12, and returns to the stirring tank 5 after filtration, and in this process, the particulate matters in the cleaning liquid are intercepted, the circulating filtration can be continuously carried out, the cleanliness of the cleaning liquid is improved, and the problems such as pipe blockage are avoided.
[0027] Further, a blowdown port with a manual valve is arranged on the top of the filter box body of the filter box 12, and a reverse flushing port is arranged on the bottom of the filter box body of the filter box 12, the reverse flushing port is connected with the water supply pipeline 1 through a reverse flushing pipeline 14. When reverse flushing of the filter box 12 is needed, the water supply pipeline 1 is connected with the filter box 12, the manual valve on the blowdown port is opened, the water source continuously enters the inside of the filter box 12 and is discharged from the blowdown port after passing through the filter screen from bottom to top, this process can discharge the particulate matters intercepted on the filter screen to the outside through the blowdown port, and after reverse flushing, the filter box 12 can restore the filtering capacity of the cleaning liquid.
[0028] Referring to Figure 3 It can be seen that:
[0029] The mixing device 4 comprises a mixing pipe 4-11, a water inlet pipe 4-1 is installed at the front end of the mixing pipe 4-11, and the rear end of the mixing pipe 4-11 is open. In this embodiment, flanges 4-3 are arranged at both ends of the mixing pipe 4-11, the water inlet pipe 4-1 is installed on a cover plate 4-2, the cover plate 4-2 is fixedly connected with the flange 4-3 at one end and a sealing gasket is arranged therebetween. The cleaning water source is input into the mixing pipe 4-11 through the water inlet pipe 4-1, and the cleaning water mixed with the cleaning liquid is discharged from the rear end of the mixing pipe 4-11 and enters the inside of the urea hydrolyzer, so the rear end of the mixing pipe 4-11 needs to be connected with the port on the urea hydrolyzer and a sealing gasket is arranged therebetween.
[0030] At least one shunt dosing pipe 4-5 is installed at the front part of the inner cavity of the mixing pipe 4-11, and a mixing assembly is installed at the rear part of the inner cavity of the mixing pipe 4-11, which comprises an inner support 4-10 fixedly installed on the inner wall of the mixing pipe 4-11, a plurality of stacked wave-shaped plates 4-6 are installed on the inner support 4-10, and flow-through channels are formed between adjacent wave-shaped plates 4-6. The wave-shaped plates 4-6 are pressed from stainless steel plates, and the flow-through channels between adjacent wave-shaped plates 4-6 are in a zigzag shape, which can improve the mixing effect.
[0031] The shunt dosing pipe 4-5 is used for injecting the cleaning liquid into the inside of the mixing pipe 4-11 in a dispersed form, as shown in the figure, the shunt dosing pipe 4-5 comprises a dosing pipe body with holes on the side wall, and the center line of the dosing pipe body is perpendicular to the center line of the mixing pipe 4-11. An adapter 4-4 is also installed at the upper end of the shunt dosing pipe 4-5, which can improve the convenience of connection with other pipelines.
[0032] In this embodiment, an inner base 4-9 is installed on the inner wall of the mixing pipe 4-11, and the inner support 4-10 is fixedly connected with the inner base 4-9, and a stabilizing sleeve 4-7 is arranged at the middle part of each wave-shaped plate 4-6, which is in the shape of a pipe sleeve, the outer diameter of which is equal to the inner diameter of the mixing pipe 4-11, a fixing plate is arranged on the inner wall of the stabilizing sleeve 4-7, and the edges of each wave-shaped plate 4-6 are fixedly connected with the fixing plate. The stabilizing sleeve 4-7 is arranged to improve the stability of each wave-shaped plate 4-6 and avoid excessive vibration noise of the mixing assembly during operation.
[0033] In the embodiment, a flushing water outlet 4-8 is arranged at the rear top of the mixing pipeline 4-11, and a blowdown pipe 4-12 with a blowdown gate valve 4-13 is arranged at the front bottom of the mixing pipeline 4-11. The flushing water outlet 4-8 is connected to a flushing water source, and the mixing assembly is flushed by injecting the flushing water source into the interior of the mixing pipeline 4-11, so that the attachments on the mixing assembly are removed, and the waste water is discharged through the blowdown pipe 4-12.
[0034] The dosing pump 11 is also included, and the outlet of the dosing pump 11 is connected to the shunt dosing pipe 5 through the conveying pipeline 6. In the embodiment, two dosing pumps 11 are arranged, and one is used as a backup. The mixing device 4 has two shunt dosing pipes 4-5, and the outlets of the two dosing pumps 11 are respectively connected to the two shunt dosing pipes 4-5 through the conveying pipelines 6. One set of dosing pump 11 and shunt dosing pipe 4-5 is used, and the other set of dosing pump 11 and shunt dosing pipe 4-5 is used as a backup.
[0035] In the embodiment, the skid base 2 is also included, the front support 10 is arranged at the front of the skid base 2, the rear support 3 is arranged at the rear of the skid base 2, the mixing tank 5 is arranged and fixed at the middle of the skid base 2, the dosing pump 11 is arranged and fixed on the front support 10, and the mixing device 4 is arranged and fixed on the rear support 3. The control box 9 is also arranged on the skid base 2, and the stirring assembly 7, the circulating pump and the dosing pump 11 are controlled through the control box 9.
Claims
1. A urea hydrolyzer cleaning dosing system characterized by: The application relates to a cleaning liquid preparation device and a mixing device (4), wherein the cleaning liquid preparation device comprises a stirring tank (5), a powder feeding opening (15) and a stirring assembly (7) are arranged on the top of the stirring tank (5), water inlets are arranged on the top wall and the bottom wall of the stirring tank (5), a water supply pipeline (1) is connected with the upper and lower water inlets of the stirring tank (5), and the mixing device (4) comprises a mixing pipeline (4-11), a water inlet pipe (4-1) is arranged at the front end of the mixing pipeline (4-11), the rear end of the mixing pipeline (4-11) is open, at least one shunt feeding pipe (4-5) is arranged at the front part of the inner cavity of the mixing pipeline (4-11), a mixing assembly is arranged at the rear part of the inner cavity of the mixing pipeline (4-11), the mixing assembly comprises an inner support (4-10) fixed on the inner wall of the mixing pipeline (4-11), a plurality of stacked wave-shaped plates (4-6) are arranged on the inner support (4-10), and flow channels are formed between the adjacent wave-shaped plates (4-6); and a feeding pump (11) is arranged, and the outlet of the feeding pump (11) is connected with the shunt feeding pipe (4-5) through a conveying pipeline (6).
2. The urea hydrolyzer cleaning dosing system of claim 1, wherein: The stirring assembly (7) comprises a stirring motor fixed on the top of the stirring tank (5), a stirring shaft and a stirring impeller arranged in the stirring tank (5), and a shaft coupling is arranged between the upper end of the stirring shaft and the output shaft of the stirring tank (5).
3. The urea hydrolyzer cleaning dosing system of claim 2, wherein: The cleaning liquid preparation device further comprises a filter box (12), the filter box (12) comprises a filter box body and a filter screen arranged in the filter box body, and the filter box (12) is connected with the stirring tank (5) through a circulating pipeline, and a circulating pump is arranged on the circulating pipeline.
4. The urea hydrolyzer cleaning dosing system of claim 3, wherein: A sewage outlet provided with a manual valve is further arranged on the top of the filter box body of the filter box (12), and a reverse flushing opening is arranged on the bottom of the filter box body of the filter box (12), and the reverse flushing opening is connected with the water supply pipeline (1) through a reverse flushing pipeline (14).
5. The urea hydrolyzer cleaning dosing system of claim 1, wherein the at least one cleaning fluid inlet is located in the urea hydrolyzer. An inner base (4-9) is arranged on the inner wall of the mixing pipeline (4-11), the inner support (4-10) is fixedly connected with the inner base (4-9), a stabilizing sleeve frame (4-7) is further arranged at the middle part of each wave-shaped plate (4-6), the stabilizing sleeve frame (4-7) is in the shape of a sleeve, the outer diameter of the stabilizing sleeve frame (4-7) is equal to the inner diameter of the mixing pipeline (4-11), a fixing plate is arranged on the inner wall of the stabilizing sleeve frame (4-7), and the edges of each wave-shaped plate (4-6) are fixedly connected with the fixing plate.
6. The urea hydrolyzer cleaning dosing system of claim 5, wherein: A flushing water opening (4-8) is arranged at the top of the rear part of the mixing pipeline (4-11), and a sewage pipe (4-12) provided with a sewage gate valve (4-13) is arranged at the bottom of the front part of the mixing pipeline (4-11).
7. The urea hydrolyzer cleaning dosing system of any one of claims 1 to 6, characterized by: Two feeding pumps (11) are arranged, one of which is used and the other is standby, the mixing device (4) is provided with two shunt feeding pipes (4-5), and the outlets of the two feeding pumps (11) are respectively connected with the two shunt feeding pipes (4-5) through the conveying pipelines (6).
8. The urea hydrolyzer cleaning dosing system of any one of claims 1 to 6, characterized by: A liquid level display (8) is arranged on the side wall of the stirring tank (5), the liquid level display (8) comprises a liquid level tube provided with a scale, and the upper end and the lower end of the liquid level tube are connected with the inner cavity of the stirring tank (5) through connecting pipes.
9. The urea hydrolyzer cleaning dosing system of any one of claims 1 to 6, characterized by: Also include pry the installation base (2), the front of the pry the installation base (2) is provided with front support (10), the rear is provided with rear support (3), the stirring tank (5) is fixedly installed in the middle of the pry the installation base (2), the dosing pump (11) is fixedly installed on the front support (10), the mixed flow device (4) is fixedly installed on the rear support (3), the control box (9) is also installed on the pry the installation base (2).