Monoammonium phosphate slurry evaporation device
Through the combination of the two-effect circulation system and the plate-type anti-corrosion evaporator, the problem of shell heat exchangers being easily blocked and corroded is solved, and efficient evaporation and production continuity of monoammonium phosphate slurry is achieved.
Patent Information
- Application Number
- CN202422757018.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-11-12
AI Technical Summary
In existing industrial production, shell heat exchangers are used for evaporating monoammonium phosphate slurry with short maintenance cycles, which are prone to clogging and corrosion, resulting in reduced production efficiency.
A two-effect circulation system is adopted, including a two-effect flash tank and a two-effect evaporator, and a backup evaporator is connected in parallel. A plate anti-corrosion evaporator is used, and a preheater is used to preheat the slurry to ensure evaporation efficiency and equipment reliability.
It improves evaporation efficiency, reduces equipment blockage and corrosion, ensures production continuity, and avoids capacity reduction due to maintenance.
Smart Images
Figure CN223299574U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemical equipment, in particular to a monoammonium phosphate slurry evaporation device. Background Art
[0002] In industrial production, the production of monoammonium phosphate requires the synthetic monoammonium phosphate slurry to be concentrated by high-temperature evaporation to obtain a high-concentration solution, and then thoroughly dried in a drying tower to obtain monoammonium phosphate crystals. Shell and tube heat exchangers are currently commonly used in industrial production to evaporate and concentrate the slurry. However, shell and tube heat exchangers have a short maintenance cycle and are prone to clogging and corrosion, requiring frequent cleaning, which reduces production efficiency. Utility Model Content
[0003] The purpose of the present utility model is to provide a monoammonium phosphate slurry evaporation device to solve the problems raised in the above background technology.
[0004] A monoammonium phosphate slurry evaporation device comprises a feed pipe, a discharge pipe, a first-effect flash tank, a second-effect flash tank, a first-effect evaporator, a second-effect evaporator and a standby evaporator, wherein the second-effect flash tank is connected to the second-effect evaporator to form a second-effect cycle, the feed pipe is connected to the second-effect cycle, and the second-effect flash tank is also connected to the standby evaporator to form a standby cycle, the second-effect flash tank is connected to the first-effect flash tank, the first-effect flash tank is connected to the first-effect evaporator to form a first-effect cycle, and the first-effect flash tank is connected to the discharge pipe.
[0005] Preferably, the second-effect evaporator is provided with a second-effect evaporation feed port, a second-effect evaporation discharge port, a second-effect evaporation air inlet and a second-effect evaporation drain port, the second-effect flash tank is provided with a second-effect flash evaporation feed port, a second-effect flash evaporation exhaust port and a second-effect flash evaporation discharge port, the second-effect flash evaporation discharge port is connected with the second-effect evaporation feed port, the second-effect flash evaporation feed port is connected with the second-effect evaporation discharge port, forming a two-effect cycle, and the second-effect cycle circuit is further provided with a second-effect cycle pump; the first-effect evaporator is provided with a first-effect evaporation feed port, a first-effect evaporation discharge port, a first-effect evaporation air inlet and a first-effect evaporation drain port, the first-effect flash tank is provided with a first-effect flash evaporation feed port, a first-effect flash evaporation exhaust port and a first-effect flash evaporation discharge port, the first-effect evaporation discharge port is connected with the first-effect flash evaporation feed port, the first-effect flash evaporation discharge port is connected with the first-effect evaporation feed port, thereby forming a first-effect cycle, and the first-effect cycle circuit is provided with a first-effect cycle pump.
[0006] Furthermore, the standby evaporator is provided with a standby evaporation feed port, a standby evaporation discharge port, a standby evaporation air inlet and a standby evaporation drain port; the standby evaporation feed port is connected to the second-effect flash evaporation discharge port; and the standby evaporation discharge port is connected to the second-effect flash evaporation feed port.
[0007] Furthermore, the first-effect flash evaporation exhaust port is communicated with the second-effect evaporation air inlet, and the standby evaporation air inlet is communicated with the first-effect flash evaporation exhaust port.
[0008] Furthermore, a preheater is included, and the feed pipe and the discharge pipe are both preheated by the preheater.
[0009] Furthermore, the second-effect evaporator adopts a plate-type anti-corrosion evaporator.
[0010] Compared with the prior art, the present invention has the following beneficial effects: the present device uses a preheater, which can preheat the incoming material in the feed pipe to about 60 degrees. When the incoming material enters the second-effect circulation, it will be mixed with the circulating slurry of about 75 degrees in the second-effect circulation and enter the second-effect evaporator. The preheater can directly bring the incoming material close to the working temperature, and the slurry that has already entered the circulation in the second-effect circulation will not be neutralized due to the low temperature of the incoming material, thereby reducing the circulation evaporation efficiency; two evaporators are arranged in parallel on the second-effect flash tank, namely the second-effect evaporator and the spare evaporator. The second-effect evaporator adopts a plate-type anti-corrosion evaporator with high evaporation efficiency and is not prone to clogging. When the second-effect evaporator needs to be inspected and maintained, the spare evaporator can be temporarily used instead of the second-effect evaporator to ensure that the entire second-effect circulation can operate normally while the second-effect evaporator can be maintained, ensuring that production will not be notified, thereby ensuring production efficiency, preventing production capacity reduction due to equipment maintenance shutdown, and indirectly increasing production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic diagram of the layout structure in an embodiment of the present utility model.
[0012] In the figure: 1. Feed pipe; 2. Discharge pipe; 3. Second-effect flash tank; 31. Second-effect flash feed port; 32. Second-effect flash discharge port; 33. Second-effect flash exhaust port; 34. Second-effect circulation pump; 35. Spare circulation pump; 4. Second-effect evaporator; 41. Second-effect evaporation feed port; 42. Second-effect evaporation discharge port; 43. Second-effect evaporation air inlet; 44. Second-effect evaporation drain port; 5. Spare evaporator; 51. Spare evaporation feed port; 52. Spare evaporation discharge port; 53. Spare evaporation air inlet; 54. Spare evaporation drain port; 6. First-effect flash tank; 61. First-effect flash feed port; 62. First-effect flash discharge port; 63. First-effect flash exhaust port; 64. First-effect circulation pump; 7. First-effect evaporator; 71. First-effect evaporation feed port; 72. First-effect evaporation discharge port; 73. First-effect evaporation air inlet; 74. First-effect evaporation drain port; 8. Preheater; 9. Valve. DETAILED DESCRIPTION
[0013] The following will be combined with specific embodiments and attached Figure 1 , clearly and completely describe the technical solutions in the embodiments of the present utility model.
[0014] A monoammonium phosphate slurry evaporation device includes a feed pipe 1, which is connected to a preheater 8. The incoming material in the feed pipe 1 first flows through the preheater 8 and can be heated to 60 degrees by the preheater 8, reaching a suitable evaporation temperature in advance, thereby preventing the incoming material in the feed pipe 1 from having too low a temperature, which would cause a decrease in evaporation efficiency.
[0015] The end of the feed pipe 1 is connected to the second-effect cycle, which includes a second-effect flash tank 3 and a second-effect evaporator 4. The second-effect flash tank 3 is provided with a second-effect flash feed port 31, a second-effect flash exhaust port 33 and a second-effect flash discharge port 32. The second-effect evaporator 4 is provided with a second-effect evaporation feed port 41, a second-effect evaporation discharge port 42, a second-effect evaporation air inlet 43 and a second-effect evaporation drain port 44, wherein the second-effect evaporation feed port 41 is connected to the second-effect flash discharge port 32 through a pipeline, the second-effect evaporation discharge port 42 is connected to the second-effect flash feed port 31 through a pipeline, the feed pipe 1 is connected to the pipeline between the second-effect flash discharge port 32 and the second-effect evaporation feed port 41, and a valve 9 is provided on the feed pipe 1 to prevent the circulating liquid from flowing back. The slurry can be circulated and evaporated in the second-effect evaporator 4 and the second-effect flash tank 3, forming a two-effect circulation circuit. At the same time, a spare valve is connected to the second-effect flash tank 3. The evaporator 5, the standby evaporator 5 and the second-effect flash tank 3 form a standby circulation circuit, which can temporarily replace the second-effect circulation to work when the second-effect evaporator is undergoing maintenance, etc., which is convenient for maintenance work. The standby evaporator 5 is connected in parallel with the second-effect evaporator 4. The standby evaporator 5 is provided with a standby evaporation feed port 51, a standby evaporation discharge port 52, a standby evaporation air inlet 53 and a standby evaporation drain port 54. The standby evaporation feed port 51 is connected to the pipeline between the second-effect flash discharge port 32 and the second-effect evaporation feed port 41 through a pipeline, and the standby evaporation discharge port is connected to the pipeline between the second-effect flash feed port 31 and the second-effect evaporation discharge port 42 through a pipeline. A second-effect circulation pump 34 is provided in the second-effect circulation circuit, and a standby circulation pump 35 is provided in the standby circulation circuit to promote the circulation of the liquid, and a valve 9 is correspondingly provided at the position where the pipelines are connected to control the circulation circuit of the liquid under different conditions.
[0016] The second-effect flash evaporation discharge port 32 is also connected to the first-effect flash evaporation tank 6 through a pipeline. The first-effect flash evaporation tank includes a first-effect flash evaporation feed port 61, a first-effect flash evaporation discharge port 62 and a first-effect flash evaporation air inlet. The first-effect flash evaporation feed port 61 is connected to the second-effect flash evaporation discharge port 32 through a pipeline. The first-effect flash evaporation tank 6 is connected to the first-effect evaporator 7. The first-effect evaporator 7 includes a first-effect evaporation feed port 71, a first-effect evaporation discharge port 72, a first-effect evaporation air inlet 73 and a first-effect evaporation drain port 74. The first-effect evaporation discharge port 72 is connected to the first-effect flash evaporation feed port 61 through a pipeline, and the first-effect evaporation feed port 71 and the first-effect flash evaporation discharge port 62 are connected through a pipeline, so that the first-effect flash tank 6 and the first-effect evaporator 7 together form a first-effect circulation circuit, which can further concentrate the slurry after the second-effect circulation at high temperature. A first-effect circulation pump 64 is provided on the pipeline connecting the first-effect flash evaporation discharge port 62 and the first-effect evaporation feed port 71 to drive the slurry to flow in a small circulation circuit.
[0017] The first-effect flash evaporation exhaust port 63 is connected to the second-effect evaporation air inlet 43 through a pipeline. By the same principle, the second-effect flash evaporation exhaust port 33 is connected to the first-effect evaporation air inlet 73 through a pipeline. The high-temperature steam generated in the flash tank is passed into the evaporator to heat the slurry in the evaporator. The first-effect flash evaporation discharge port 62 is connected to the discharge pipe 2, and the discharge pipe 2 is connected to the preheater 8. The slurry in the discharge pipe 2 is the high-temperature slurry flowing out of the first-effect flash tank 6, and its temperature is about 105°C. Entering the preheater 8 can perform heat exchange with the slurry in the feed pipe 1 flowing through the preheater 8, so that the temperature of the slurry in the feed pipe 1 increases, while the temperature of the slurry in the discharge pipe 2 decreases. After mutual heat exchange, the temperature of the slurry in the feed pipe 1 will rise from 60°C at room temperature, and the temperature of the slurry in the discharge pipe 2 will drop from 150°C to 85°C, which is convenient for removing the system and proceeding to the next step.
[0018] The second-effect evaporator 4 adopts a plate-type anti-corrosion evaporator, while the first-effect evaporator 7 and the standby evaporator 5 adopt shell-and-tube evaporators. The plate-type anti-corrosion evaporator is an existing technology. Although it is expensive, its advantage is that it completely isolates the plate substrate from the corrosive medium through a specific anti-corrosion coating, thereby achieving the purpose of corrosion resistance, reducing the contribution of blockage and corrosion, extending the maintenance cycle of the heat exchanger, and reducing the number of heat exchanges to achieve the effect of reducing costs and increasing profits. At the same time, when the second-effect evaporator 4 is under maintenance, the standby evaporator 5 can form a standby cycle to temporarily replace the second-effect evaporator 4, ensuring that production activities will not be interrupted and ensuring production efficiency.
[0019] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.
[0020] In the present invention, "up", "down", "left", "right", "front" and "back" are relative positions used to conveniently describe positional relationships, and therefore cannot be understood as absolute positions to limit the scope of protection.
[0021] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.
Claims
1. A monoammonium phosphate slurry evaporation device, characterized in that: The invention comprises a feed pipe, a discharge pipe, a first-effect flash tank, a second-effect flash tank, a first-effect evaporator, a second-effect evaporator and a standby evaporator. The second-effect flash tank is connected with the second-effect evaporator to form a second-effect cycle. At the same time, the second-effect flash tank is also connected with the standby evaporator to form a standby cycle. The second-effect flash tank is connected with the first-effect flash tank. The first-effect flash tank is connected with the first-effect evaporator to form a first-effect cycle. The first-effect flash tank is connected with the discharge pipe.
2. The monoammonium phosphate slurry evaporation device according to claim 1, characterized in that: The second-effect evaporator is provided with a second-effect evaporation feed port, a second-effect evaporation discharge port, a second-effect evaporation air inlet and a second-effect evaporation drain port; the second-effect flash tank is provided with a second-effect flash feed port, a second-effect flash exhaust port and a second-effect flash discharge port; the second-effect flash discharge port is communicated with the second-effect evaporation feed port, and the second-effect flash feed port is communicated with the second-effect evaporation discharge port to form a second-effect cycle; a second-effect circulation pump is further provided in the second-effect circulation circuit; the first-effect evaporator is provided with a first-effect evaporation feed port, a first-effect evaporation discharge port, a first-effect evaporation air inlet and a first-effect evaporation drain port; the first-effect flash tank is provided with a first-effect flash feed port, a first-effect flash exhaust port and a first-effect flash discharge port; the first-effect evaporation discharge port is communicated with the first-effect flash feed port, and the first-effect flash discharge port is communicated with the first-effect evaporation feed port to form a first-effect cycle; a first-effect circulation pump is provided in the first-effect circulation circuit.
3. The monoammonium phosphate slurry evaporation device according to claim 2, characterized in that: The standby evaporator is provided with a standby evaporation feed port, a standby evaporation discharge port, a standby evaporation air inlet and a standby evaporation drain port. The standby evaporation feed port is connected to the second-effect flash evaporation discharge port, and the standby evaporation discharge port is connected to the second-effect flash evaporation feed port.
4. The monoammonium phosphate slurry evaporation device according to claim 3, characterized in that: The first-effect flash evaporation exhaust port is communicated with the second-effect evaporation air inlet, and the standby evaporation air inlet is communicated with the first-effect flash evaporation exhaust port.
5. The monoammonium phosphate slurry evaporation device according to claim 4, characterized in that: It also includes a preheater, and the feed pipe and the discharge pipe are both preheated by the preheater.
6. The monoammonium phosphate slurry evaporation device according to claim 5, characterized in that: The second-effect evaporator adopts a plate-type anti-corrosion evaporator.