Recovery system for safely recovering phosphorus in phosphorus sludge

Abstract

The utility model relates to the field of yellow phosphorus production equipment, in particular to a system for safely recovering phosphorus in phosphorus sludge. A recovery system for safely recovering phosphorus in phosphorus sludge comprises a gas furnace (1), a rotary pot (2), a speed regulating motor (3), a phosphorus collecting pool (4), a phosphorus pump (5) and a control box (6). A gas pipe (7) and a flame detector (8) are arranged at the bottom of the gas furnace (1), and a gas inlet regulating valve A (9) and an electronic igniter (10) are arranged on the gas pipe (7); a temperature sensor A (11) is arranged in the rotary pot (2); a pressure sensor (13) is arranged on the phosphorus steam pipe (12), and a flow guide cover (14) and a flow distribution plate (15) are arranged at an outlet of the phosphorus steam pipe (12); a steam heating coil (16) is arranged at the bottom of the phosphorus collecting tank (4); and a phosphorus pump (5) and a temperature sensor B (17) are arranged in the middle of the phosphorus collecting tank (4). The yellow phosphorus recovery device is simple in structure, easy and convenient to operate, high in yellow phosphorus recovery rate, high in safety and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the field of yellow phosphorus production equipment, in particular to a recovery system for safely recovering phosphorus in mud phosphorus. Background Art

[0002] Mud phosphorus is one of the main by-products produced during the production of yellow phosphorus and is a hazardous solid waste in the phosphorus chemical industry. Mud phosphorus is produced during the production of yellow phosphorus by the currently commonly used electrothermal method. The amount of mud phosphorus accounts for about 7-15% of the yellow phosphorus product, and the phosphorus content in the mud phosphorus is about 20-70%, which has a high recovery value. The distillation method uses a rotary pot or a fixed pot to intermittently heat the mud phosphorus and release phosphorus vapor at a certain temperature and pressure. At the same time, the phosphorus vapor is cleaned and condensed to recover the elemental phosphorus, and the remaining impurities are deposited and discharged intermittently.

[0003] However, after the gas furnace of the rotary pot was changed from manual ignition to electronic ignition, there was a situation where the gas inlet valve of the gas pipe continued to open for ventilation when the electronic ignition failed to ignite due to a fault, causing a safety hazard of gas leakage. When the phosphorus collecting tank is used to recover yellow phosphorus, the temperature and pressure of phosphorus vapor are uncontrollable, resulting in a low recovery rate, and the excess unrecovered phosphorus vapor is prone to spontaneous combustion and explosion after contact with air. In addition, when recovering yellow phosphorus in the phosphorus collecting tank, a submersible pump was originally used for recovery, which is also prone to fire when pulling and releasing the submersible pump. Therefore, there are safety hazards in the entire phosphorus recovery production of mud phosphorus. Summary of the invention

[0004] The utility model aims at the deficiencies of the prior art and provides a phosphorus recovery system for phosphorus in phosphorus mud which has simple structure, simple operation, high yellow phosphorus recovery rate, high safety and environmental protection, and effectively solves the safety problem in the phosphorus recovery production of phosphorus mud.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The recovery system for safe recovery of phosphorus from sludge phosphorus includes a gas furnace, a rotary pot, a speed regulating motor, a phosphorus collection pool, a phosphorus extraction pump and a control box;

[0007] A gas pipe and a flame detector are provided at the bottom of the gas furnace, an A air intake regulating valve and an electronic igniter are provided on the gas pipe, and a rotating pot is provided in the gas furnace; the rotating pot is driven by a speed regulating motor, and an A temperature sensor is provided in the rotating pot; a cover is provided at one end of the rotating pot, and a phosphorus vapor pipe is provided at the other end to connect to the phosphorus collecting pool, a pressure sensor is provided on the phosphorus vapor pipe, and a guide cover and a diverter plate are provided at the outlet of the phosphorus vapor pipe; a steam heating coil is provided at the bottom of the phosphorus collecting pool, a phosphorus extraction pump and a B temperature sensor are provided in the middle of the phosphorus collecting pool, and the steam heating coil is connected to the steam pipe through the B air intake regulating valve;

[0008] The control box is equipped with a phosphorus steaming button, a phosphorus extraction button, a stop button and an alarm, and a controller is provided inside the control box;

[0009] The flame detector, A temperature sensor, pressure sensor, B temperature sensor, phosphorus vaporization button, phosphorus extraction button and stop button are connected to the controller through signal lines, and the controller is connected to the phosphorus extraction pump, A air intake regulating valve, electronic igniter, speed regulating motor, B air intake regulating valve and alarm through control lines.

[0010] The phosphorus extraction pump is a submersible pump.

[0011] The deflector is trumpet-shaped, and the splitter plate is conical and fixed below the deflector.

[0012] The A air intake regulating valve and the B air intake regulating valve are electromagnetic air intake regulating valves.

[0013] The controller is a DCS host, and the signal line and the control line are shielded lines.

[0014] When phosphorus is being steamed, the worker opens the cover of the rotating pot and places the phosphorus mud containing elemental yellow phosphorus in the rotating pot, then closes the cover of the rotating pot and presses the phosphorus steaming button. The phosphorus steaming button transmits a signal to the controller, which opens the A air intake regulating valve on the gas pipe and ignites it with the electronic igniter. The gas burns and heats the rotating pot. If the electronic igniter fails to ignite due to a fault and the flame detector does not detect a flame, the flame detector transmits a signal to the controller through the signal line, and the controller controls the alarm to sound an alarm to remind the staff that the ignition is unsuccessful. At the same time, the controller controls the closing of the A air intake regulating valve on the gas pipe. This prevents the gas pipe air intake valve from continuing to open for ventilation when the electronic igniter fails to ignite due to a fault, causing a safety hazard of gas leakage.

[0015] After the ignition is successful, the controller starts the speed regulating motor to make the rotating pot slowly rotate and heat in the gas furnace. The A temperature sensor transmits the temperature signal of the rotating pot to the controller. The controller adjusts the speed of the speed regulating motor and the closing degree of the A air intake regulating valve to make the temperature of the rotating pot within a certain range. The heat evaporates the elemental yellow phosphorus. The phosphorus vapor is introduced into the phosphorus collection pool through the phosphorus vapor pipe, and the phosphorus vapor is cooled by water. The yellow phosphorus is separated by standing. The phosphorus vapor passes through the guide cover and the diverter plate at the outlet of the phosphorus vapor pipe, which can increase the contact area between the phosphorus vapor and the water, so that the phosphorus vapor is fully in contact with the water. Under the condition that the temperature and pressure of the phosphorus vapor are controllable, the recovery rate of yellow phosphorus is improved, and it is ensured that there is no excess phosphorus vapor that spontaneously ignites and explodes after contacting the air. The pressure sensor transmits the air pressure signal of the phosphorus vapor pipe to the controller. When the air pressure is lower than a certain value, the controller closes the A air intake regulating valve and the speed regulating motor. The employee opens the end cover of the rotating pot to remove the residue.

[0016] The B temperature sensor transmits the temperature signal of the phosphorus collecting pool to the controller, and the controller adjusts the closing degree of the B air inlet regulating valve. The steam controls the temperature of the phosphorus collecting pool within a certain range through the steam heating coil to ensure that the yellow phosphorus at the bottom of the phosphorus collecting pool is liquid yellow phosphorus when extracting phosphorus.

[0017] When phosphorus needs to be extracted, the employee presses the phosphorus extraction button, which transmits the signal to the controller. The controller controls the operation of the phosphorus extraction pump to extract the liquid yellow phosphorus at the bottom of the phosphorus collection pool to other processes. There is no spontaneous combustion or explosion of yellow phosphorus after contact with air.

[0018] At the end of the work, the employee presses the stop button, which transmits a signal to the controller, and the controller controls the phosphorus extraction pump to stop running and close the B air inlet regulating valve.

[0019] Through the above steps, it is ensured that there are no safety hazards in the entire mud phosphorus recovery phosphorus production.

[0020] Beneficial effects of the utility model:

[0021] 1. The utility model has the advantages of simple structure, easy operation, high yellow phosphorus recovery rate, high safety and environmental protection.

[0022] 2. The utility model adopts a flame detector to detect flames, which can prevent the gas pipe inlet valve from continuing to open for ventilation when the electronic igniter fails to ignite due to a fault, thereby causing a safety hazard of gas leakage.

[0023] 3. The utility model adopts a flame detector, a controller and an alarm to remind the staff that the ignition is unsuccessful.

[0024] 4. The utility model adopts a flow guide cover and a diverter plate to increase the contact area between phosphorus vapor and water, so that the phosphorus vapor can fully contact with water, and the temperature and pressure of the phosphorus vapor can be controlled, thereby improving the recovery rate of yellow phosphorus and ensuring that there is no spontaneous combustion and explosion of excess phosphorus vapor after contacting with air.

[0025] 5. The utility model adopts B temperature sensor, B air intake regulating valve and steam heating coil, which can control the temperature of the phosphorus collection pool within a certain range, ensuring that the yellow phosphorus at the bottom of the phosphorus collection pool is liquid yellow phosphorus when extracting phosphorus.

[0026] 6. The utility model adopts a submersible pump as the phosphorus extraction pump, and there is no spontaneous combustion and explosion of yellow phosphorus after contacting with air.

[0027] 7. The signal line and control line of the utility model adopt shielded wire, which has a higher transmission rate and good anti-electromagnetic interference ability to ensure the safe operation of the drying work.

[0028] 8. The controller of the utility model is a DCS host that can automatically control various devices with high control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional schematic diagram of the utility model.

[0030] Figure 2 It is a cross-sectional view of the guide cover and the diverter plate described in the utility model.

[0031] Figure 3 It is a three-dimensional schematic diagram of the steam heating coil described in the utility model.

[0032] Figure 4 It is a wiring diagram of the utility model.

[0033] 1-gas furnace, 2-rotating pot, 3-speed regulating motor, 4-phosphorus collecting pool, 5-phosphorus extraction pump, 6-control box, 7-gas pipe, 8-flame detector, 9-A air intake regulating valve, 10-electronic igniter, 11-A temperature sensor, 12-phosphorus vapor pipe, 13-pressure sensor, 14-flow guide cover, 15-dividing plate, 16-steam heating coil, 17-B temperature sensor, 18-B air intake regulating valve, 19-phosphorus vaporization button, 20-phosphorus extraction button, 21-stop button, 22-alarm, 23-controller. DETAILED DESCRIPTION

[0034] like Figures 1 to 4 As shown, the recovery system for safely recovering phosphorus from sludge phosphorus includes a gas furnace 1, a rotary pot 2, a speed regulating motor 3, a phosphorus collection pool 4, a phosphorus extraction pump 5 and a control box 6;

[0035] A gas pipe 7 and a flame detector 8 are provided at the bottom of the gas furnace 1, an A air intake regulating valve 9 and an electronic igniter 10 are provided on the gas pipe 7, and a rotating pot 2 is provided in the gas furnace 1; the rotating pot 2 is driven by a speed regulating motor 3, and an A temperature sensor 11 is provided in the rotating pot 2; a cover is provided at one end of the rotating pot 2, and a phosphorus vapor pipe 12 is provided at the other end to connect to the phosphorus collecting pool 4, a pressure sensor 13 is provided on the phosphorus vapor pipe 12, and a guide cover 14 and a diverter plate 15 are provided at the outlet of the phosphorus vapor pipe 12; a steam heating coil 16 is provided at the bottom of the phosphorus collecting pool 4, a phosphorus extraction pump 5 and a B temperature sensor 17 are provided in the middle of the phosphorus collecting pool 4, and the steam heating coil 16 is connected to the steam pipe through a B air intake regulating valve 18;

[0036] The control box 6 is provided with a phosphorus steaming button 19, a phosphorus extraction button 20, a stop button 21 and an alarm 22, and a controller 23 is provided inside the control box 6;

[0037] The flame detector 8, the A temperature sensor 11, the pressure sensor 13, the B temperature sensor 17, the phosphorus evaporation button 19, the phosphorus extraction button 20, and the stop button 21 are connected to the controller 23 through signal lines, and the controller 23 is connected to the phosphorus extraction pump 5, the A air intake regulating valve 9, the electronic igniter 10, the speed control motor 3, the B air intake regulating valve 18 and the alarm 22 through control lines.

[0038] The phosphorus extraction pump 5 is a submersible pump.

[0039] The deflector 14 is trumpet-shaped, and the splitter plate 15 is conical and fixed below the deflector 14 .

[0040] The A intake regulating valve 9 and the B intake regulating valve 18 are electromagnetic intake regulating valves.

[0041] The controller 23 is a DCS host, and the signal line and the control line are shielded lines.

[0042] When the phosphorus is being steamed, the staff opens the end cover of the rotating pot 2 and places the phosphorus mud containing elemental yellow phosphorus in the rotating pot 2, then closes the end cover of the rotating pot 2 and presses the phosphorus steaming button 19. The phosphorus steaming button 19 transmits a signal to the controller 23. The controller 23 opens the A air intake regulating valve 9 on the gas pipe 7 and ignites with the electronic igniter 10. The gas burns and heats the rotating pot 2. If the electronic igniter 10 fails to ignite due to a fault and the flame detector 8 does not detect a flame, the flame detector 8 transmits a signal to the controller 23 through the signal line. The controller 23 controls the alarm 22 to sound an alarm to remind the staff that the ignition is unsuccessful. At the same time, the controller 23 controls the closing of the A air intake regulating valve 9 on the gas pipe 7. This prevents the situation where the air intake valve of the gas pipe 7 continues to be opened for ventilation when the electronic igniter 10 fails to ignite due to a fault, causing a safety hazard of gas leakage.

[0043] After the ignition is successful, the controller 23 starts the speed regulating motor 3 to make the rotating pot 2 rotate slowly and heat in the gas furnace 1. The A temperature sensor 11 transmits the temperature signal of the rotating pot 2 to the controller 23. The controller 23 adjusts the speed of the speed regulating motor 3 and the closing degree of the A air intake regulating valve 9 to make the temperature of the rotating pot 2 within a certain range. The heat evaporates the elemental yellow phosphorus. The phosphorus vapor is introduced into the phosphorus collection pool 4 through the phosphorus vapor pipe 12, and the phosphorus vapor is cooled by water. The yellow phosphorus is separated by standing. The phosphorus vapor passes through the guide cover 14 and the diverter plate 15 at the outlet of the phosphorus vapor pipe 12, which can increase the contact area between the phosphorus vapor and the water, so that the phosphorus vapor is fully in contact with the water. Under the condition that the temperature and pressure of the phosphorus vapor are controllable, the recovery rate of yellow phosphorus is improved, and it is ensured that there is no excess phosphorus vapor that spontaneously ignites and explodes after contacting the air. The pressure sensor 13 transmits the air pressure signal of the phosphorus vapor pipe 12 to the controller 23. When the air pressure is lower than a certain value, the controller 23 closes the A air intake regulating valve 9 and the speed regulating motor 3. The employee opens the end cover of the rotating pot 2 to remove the residue.

[0044] The B temperature sensor 17 transmits the temperature signal of the phosphorus collecting pool 4 to the controller 23, and the controller 23 adjusts the closing degree of the B air inlet regulating valve 18. The steam controls the temperature of the phosphorus collecting pool 4 within a certain range through the steam heating coil 16 to ensure that the yellow phosphorus at the bottom of the phosphorus collecting pool 4 is liquid yellow phosphorus when extracting phosphorus.

[0045] When phosphorus extraction is required, the employee presses the phosphorus extraction button 20, which transmits a signal to the controller 23. The controller 23 controls the phosphorus extraction pump 5 to operate, and the liquid yellow phosphorus at the bottom of the phosphorus collection pool 4 is extracted to other processes. There is no spontaneous combustion or explosion of yellow phosphorus after contacting with air.

[0046] When the work is finished, the employee presses the stop button 21, and the stop button 21 transmits a signal to the controller 23, and the controller 23 controls the phosphorus extraction pump 5 to stop running and closes the B air intake regulating valve 18.

[0047] Through the above steps, it is ensured that there are no safety hazards in the entire mud phosphorus recovery phosphorus production.

Claims

1. A system for safely recovering phosphorus from sludge phosphorus, characterized in that: It comprises a gas furnace (1), a rotary pot (2), a speed regulating motor (3), a phosphorus collecting pool (4), a phosphorus extraction pump (5) and a control box (6); A gas pipe (7) and a flame detector (8) are provided at the bottom of the gas furnace (1), an A air intake regulating valve (9) and an electronic igniter (10) are provided on the gas pipe (7), and a rotating pot (2) is provided in the gas furnace (1); the rotating pot (2) is driven by a speed regulating motor (3), and an A temperature sensor (11) is provided in the rotating pot (2); a cover is provided at one end of the rotating pot (2), and a phosphorus vapor pipe (12) is provided at the other end, which is connected to a phosphorus collecting pool (4), a pressure sensor (13) is provided on the phosphorus vapor pipe (12), and a guide cover (14) and a splitter plate (15) are provided at the outlet of the phosphorus vapor pipe (12); a steam heating coil (16) is provided at the bottom of the phosphorus collecting pool (4), a phosphorus extraction pump (5) and a B temperature sensor (17) are provided in the middle of the phosphorus collecting pool (4), the steam heating coil (16) is connected to the steam pipe via a B air intake regulating valve (18), and the A air intake regulating valve (9) and the B air intake regulating valve (18) are electromagnetic air intake regulating valves; The control box (6) is provided with a phosphorus steaming button (19), a phosphorus extraction button (20), a stop button (21) and an alarm (22), and a controller (23) is provided inside the control box (6); The flame detector (8), the A temperature sensor (11), the pressure sensor (13), the B temperature sensor (17), the phosphorus vaporization button (19), the phosphorus extraction button (20), and the stop button (21) are connected to the controller (23) through a signal line. The controller (23) is connected to the phosphorus extraction pump (5), the A air intake regulating valve (9), the electronic igniter (10), the speed regulating motor (3), the B air intake regulating valve (18), and the alarm (22) through a control line. The controller (23) is a DCS host, and the signal line and the control line are shielded lines.

2. The system for safely recovering phosphorus from sludge phosphorus according to claim 1, characterized in that: The phosphorus extraction pump (5) is a submersible pump.

3. The system for safely recovering phosphorus from sludge phosphorus according to claim 1 or 2, characterized in that: The deflector cover (14) is trumpet-shaped, and the diverter plate (15) is conical and fixed below the deflector cover (14).

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