Phosphoric acid concentration equipment for spray absorption

Abstract

The utility model relates to phosphoric acid production equipment, in particular to phosphoric acid concentration equipment for spraying and absorbing. The problems of small distillation capacity and high energy consumption are solved. Comprising a distillation still and a vacuum cooling tank, the vacuum cooling tank is higher than the distillation still, the top of the side wall of the distillation still is provided with an emptying pipe communicated with the middle of the side wall of the vacuum cooling tank, and the bottom of the vacuum cooling tank is provided with a return pipe communicated with the side wall of the bottom of the distillation still; an inverted T-shaped pipe is arranged at the bottom of the distillation kettle, the other two ends of the T-shaped pipe are respectively connected with a liquid discharge pipe and a liquid inlet pipe, manual valves are respectively arranged on the liquid discharge pipe and the liquid inlet pipe, and an electromagnetic valve is arranged between the liquid inlet pipe and the distillation kettle; a steam coil pipe is arranged in the distillation kettle, a vacuum pipe is arranged at the top of the vacuum cooling tank, and a cooling coil pipe is arranged in a corresponding area of the vacuum pipe and the emptying pipe. The single capacity is large, and the production energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to phosphoric acid production equipment, especially is used for the concentration equipment of phosphoric acid of spray absorption. BACKGROUND

[0002] The heat method phosphoric acid production dispenses with a large amount of chemical medicine, and thus has less influence on the environment. The product produced by the heat method is also relatively pure, but the production process is more complex than the wet method, and the cost is relatively high. After yellow phosphorus burns, it generates phosphorus pentoxide, and there is an insufficient absorption condition in the absorption filtration. A large amount of liquid containing phosphoric acid is generated in the process of producing phosphoric acid by the spray method, which requires concentration treatment of the liquid. The current method is to use a single distillation still to distill and concentrate. This is low in efficiency and requires a high distillation temperature. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a device for distillation recovery of liquid phosphoric acid absorbed by spraying, which recycles and returns water in the liquid to the previous process for use, realizes heat recycling, and saves energy.

[0004] The utility model discloses a concentration equipment for phosphoric acid of spray absorption, including distillation still and vacuum cooling tank, vacuum cooling tank is higher than distillation still, the top of the lateral wall of distillation still is equipped with a emptying pipe and the lateral wall middle position communication of vacuum cooling tank, the bottom of vacuum cooling tank is equipped with the lateral wall communication of backflow pipe and distillation still bottom, and backflow pipe bottom middle position is equipped with the vertical blow-off pipe;The bottom of distillation still is equipped with the T-shaped pipe of inversion, and the other two ends of T-shaped pipe are connected with liquid discharge pipe and liquid inlet pipe respectively, and manual valve is arranged on liquid discharge pipe and liquid inlet pipe respectively, and the electromagnetic valve is arranged between liquid inlet pipe and distillation still;

[0005] The inside of distillation still is equipped with steam coil pipe, and the outside lateral wall of middle and lower part is equipped with jacket, and the top of steam coil pipe is communicated with the steam pipe of the lateral wall top of distillation still, and the bottom of steam coil pipe is communicated with the back liquid pipe of the lateral wall bottom of distillation still;

[0006] The top of vacuum cooling tank is equipped with vacuum pipe, and cooling coil pipe is arranged in the corresponding area of vacuum pipe and emptying pipe, and the top of cooling coil pipe is communicated with the cooling pipe of the lateral wall of vacuum cooling tank, and the connecting pipe of the bottom of cooling coil pipe is communicated with backflow pipe after entering distillation still through emptying pipe.

[0007] More preferably, the connecting pipe is in the form of a coil. During the vacuum process, the airflow is guided in the emptying pipe to achieve pre-cooling first, and the pre-heating in the cooling coil is fully utilized. An observation window is arranged on the lateral wall of the vacuum cooling tank to facilitate timely observation of the remaining solution in the vacuum cooling tank.

[0008] More preferably, the emptying pipe is provided with a temperature probe, the temperature probe is connected to a controller of a cooling pipe control valve of the cooling coil, and a vacuum pump of the vacuum pipe is also connected to the controller. When the temperature of the emptying pipe reaches a certain value, it is determined that a certain amount of steam is generated, and the water in the cooling coil starts to circulate; when the temperature of the emptying pipe is lower than the same value, the water in the cooling coil stops circulating.

[0009] The distillation kettle and the vacuum cooling tank are communicated, thereby indirectly increasing the distillation liquid volume of the whole distillation kettle, increasing the single distillation amount, and not reducing the distillation efficiency. 2. The vacuum extraction guides steam flow, reduces the temperature of water evaporation, reduces energy consumption, and reduces cost. 3. The evaporated water vapor ensures water evaporation while cooling phosphoric acid in the steam, remains in the vacuum cooling tank, and reduces loss. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structure schematic view of the utility model.

[0011] Figure 2 It is another side structure schematic view of the utility model.

[0012] Figure 3 It is a sectional view of the utility model.

[0013] Distillation kettle 1, steam coil 101, jacket 102, steam pipe 103, liquid return pipe 104, vacuum cooling tank 2, vacuum pipe 201, cooling coil 202, cooling pipe 203, return pipe 205, emptying pipe 3, return pipe 4, blowdown pipe 41, T-shaped pipe 5, liquid discharge pipe 6, liquid inlet pipe 7, manual valve 8, electromagnetic valve 9, observation window 10. DETAILED DESCRIPTION

[0014] The utility model is further described below in combination with the drawings and examples.

[0015] Wherein, the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "in" and "out" refer to the directions towards or away from the geometric center of a particular component. The drawings are very simplified and use non-precise ratios, and are only used to facilitate and clarify the purpose of assisting the description of the embodiments of the utility model. EMBODIMENT

[0016] As Figure 1 And Figure 2As shown, the concentration equipment for phosphoric acid absorption by spraying includes a distillation kettle 1 and a vacuum cooling tank 2. The vacuum cooling tank 2 is higher than the distillation kettle 1. A drain pipe 3 is provided at the top of the side wall of the distillation kettle 1 and is connected to the middle of the side wall of the vacuum cooling tank 2. A reflux pipe 4 is provided at the bottom of the vacuum cooling tank 2 and is connected to the bottom side wall of the distillation kettle 1. A vertical drain pipe 41 is provided at the middle of the bottom of the reflux pipe 4. An inverted T-shaped pipe 5 is provided at the bottom of the distillation kettle 1. The other two ends of the T-shaped pipe 5 are connected to the drain pipe 6 and the inlet pipe 7, respectively. Manual valves 8 are provided on the drain pipe 6 and the inlet pipe 7, respectively. A solenoid valve 9 is provided between the inlet pipe 7 and the distillation kettle 1. The solenoid valve 9 can measure the volume of liquid entering the distillation by the opening time without the need for manual intervention.

[0017] like Figure 3 As shown, the distillation vessel 1 is equipped with a steam coil 101 inside, and a jacket 102 is provided on the lower outer wall. The top of the steam coil 101 is connected to the steam pipe 103 that passes through the top of the side wall of the distillation vessel, and the bottom of the steam coil 101 is connected to the return pipe 104 that passes through the bottom of the side wall of the distillation vessel 1.

[0018] The vacuum cooling tank 2 has a vacuum tube 201 at its top. A cooling coil 202 is installed in the corresponding area of ​​the vacuum tube 2 and the exhaust pipe 3. The top of the cooling coil 202 is connected to a cooling tube 203 that penetrates the side wall of the vacuum cooling tank. The connecting pipe 204 at the bottom of the cooling coil 202 enters the distillation vessel 1 through the exhaust pipe 3 and then exits to connect with the reflux pipe 205. The connecting pipe 204 has a coil structure. During the vacuuming process, the airflow is guided to achieve pre-cooling within the exhaust pipe 3, fully utilizing the preheating within the cooling coil. An observation window 10 is provided on the side wall of the vacuum cooling tank 2 for timely observation of the remaining solution inside the vacuum cooling tank.

[0019] A temperature probe is installed on the vent pipe 3, and the temperature probe is connected to the controller of the cooling pipe control valve of the cooling coil 202. The vacuum pump of the vacuum pipe 201 is also connected to the controller. When the temperature of the vent pipe reaches a certain value, it is determined that a certain amount of steam has been generated, and the water in the cooling coil will start to circulate. When the temperature of the vent pipe is lower than the same value, the water in the cooling coil will stop circulating.

[0020] Working principle: The manual valves on the inlet and outlet pipes are normally closed. When liquid needs to be added, the manual valve on the inlet pipe is opened, and at the same time, the solenoid valve located after the manual valve opens to add liquid. The metering of the liquid entering the distillation is controlled by the working time of the solenoid valve. Through the communicating vessel function of the reflux pipe, part of the solution enters the cooling vacuum tank, but is lower than the drain pipe. After the liquid addition is completed, the solenoid valve is closed.

[0021] The steam is sent into the steam coil through the steam pipe to heat the liquid in the distillation kettle, and the liquid produces almost no steam during the initial heating process. When the temperature probe on the exhaust pipe detects a temperature change, the feedback is sent to the controller, and the vacuum pump of the vacuum pipe starts to work, while the cooling liquid in the cooling coil starts to circulate. After the liquid in the distillation kettle is heated, the water is evaporated into water vapor, which is in a vacuum state and enters the cooling vacuum pipe through the exhaust pipe. The connecting pipe in the exhaust pipe realizes a certain pre-cooling of the water vapor, and then the water vapor enters the cooling coil area. The phosphoric acid in the water vapor is cooled and left in the cooling vacuum tank.

[0022] During the heating process, the liquid in the vacuum cooling tank has low temperature and large weight, which will be heat-exchanged and circulated to the lower distillation kettle, so as to realize the circulation of the liquid in the whole connected vessel and realize the heating and distillation of the liquid in the two tank bodies. Generally, after working for a period of time, the worker observes the liquid level in the vacuum cooling tank to determine whether the concentration process is completed, so as to open the control valve of the liquid discharge pipe to discharge the distilled liquid. The system can also be reminded by setting a liquid level meter.

[0023] For the sake of clarity, not all features of actual embodiments are described, in the following description, well-known functions or constructions are not described in detail because they will obscure the application due to unnecessary detail, it should be understood that in the development of any actual embodiment numerous implementation-specific decisions must be made, which have an impact on the design of the application, such as the choice of a particular machine or process, the choice of a particular programming language, the choice of a particular software implementation, the choice of a particular hardware system, the choice of a particular operating system, the choice of a particular user interface, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of a particular data storage, the choice of

Claims

1. A concentration device for phosphoric acid absorbed by spraying, characterized in that: It includes a distillation kettle and a vacuum cooling tank. The vacuum cooling tank is higher than the distillation kettle. The top of the side wall of the distillation kettle is equipped with an vent pipe that connects to the middle of the side wall of the vacuum cooling tank. The bottom of the vacuum cooling tank is equipped with a reflux pipe that connects to the bottom side wall of the distillation kettle. A vertical drain pipe is located in the middle of the bottom of the reflux pipe. The bottom of the distillation kettle is equipped with an inverted T-shaped pipe. The other two ends of the T-shaped pipe are connected to the drain pipe and the inlet pipe, respectively. Manual valves are installed on the drain pipe and the inlet pipe. A solenoid valve is installed between the inlet pipe and the distillation kettle. The distillation vessel is equipped with a steam coil inside, and a jacket is provided on the lower outer wall. The top of the steam coil is connected to a steam pipe that passes through the top of the side wall of the distillation vessel, and the bottom of the steam coil is connected to a return pipe that passes through the bottom of the side wall of the distillation vessel. The top of the vacuum cooling tank is equipped with a vacuum tube, and a cooling coil is provided in the corresponding area of ​​the vacuum tube and the vent pipe. The top of the cooling coil is connected to the cooling tube that penetrates the side wall of the vacuum cooling tank, and the connecting pipe at the bottom of the cooling coil enters the distillation kettle through the vent pipe and then exits to connect with the reflux pipe.

2. The phosphoric acid concentration device for spray absorption as described in claim 1, characterized in that: The connecting pipe is a coil structure, and the side wall of the vacuum cooling tank is provided with an observation window.

3. The concentration equipment for phosphoric acid used in spray absorption as described in claim 1 or 2, characterized in that: A temperature probe is installed on the vent pipe, and the temperature probe is connected to the controller of the cooling pipe control valve of the cooling coil. The vacuum pump of the vacuum tube is also connected to the controller.

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