Phosphate ore drying machine with anti-explosion safety ignition system

Abstract

The utility model relates to the technical field of phosphorus chemical industry, in particular to a phosphate ore drying machine with an anti-explosion safety ignition system. A phosphate ore drying machine with an anti-explosion safety ignition system comprises a drying roller (1), a rotating motor (2), the anti-explosion safety ignition system (3), a start button (4), a stop button (5), an alarm (6) and a controller (7). The anti-explosion safety ignition system (3) comprises a phosphorus furnace tail gas supply pipe (8), a safety water seal (9), a phosphorus furnace tail gas inlet pipe (10), a combustion-supporting air inlet pipe (11), an electronic igniter (12) and an oxygen supply fan (13); a phosphate ore discharging pipe (14), a phosphorus furnace tail gas inlet pipe (10), a combustion-supporting air inlet pipe (11) and an electronic igniter (12) are arranged at the feeding end of the drying roller (1); and a flame detector (18) is arranged above the combustion-supporting air inlet pipe (11). The drying device is simple in structure, easy and convenient to operate, high in drying efficiency, safe and explosion-proof.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphorus chemical industry, in particular to a phosphate rock drying machine with an explosion-proof safety ignition system. Background Art

[0002] Phosphate ore needs to be dried before entering the furnace, usually using a drum dryer, which is a continuous direct contact dryer. It consists of a slowly rotating cylindrical shell, which is tilted to facilitate the conveying of wet phosphate ore. The phosphate ore enters the rotating cylinder from the high end, and the dried product is discharged from the low end.

[0003] There are differences in the types and water content of phosphate rocks. Now, the tail gas from the phosphorus furnace is generally purified and recovered and used as a heat source for drying the phosphate rock. This has both economic and social benefits, and can effectively reduce the emission of harmful gases. The utilization of the calorific value of the tail gas can also improve the utilization rate of resources to a certain extent and reduce the production cost of yellow phosphorus.

[0004] However, in the existing equipment that uses the combustion of phosphorus furnace tail gas to dry phosphate ore, electronic ignition is used for ignition. At the same time, when drying dust recovery, the dust temperature cannot be too high, otherwise it is easy to damage the dust recovery filter bag, and the dust outlet temperature must be controlled within a certain range. However, the dryer is in real-time motion, the flow rate of phosphorus furnace tail gas and combustion air is fast, and the air pressure is increased. At the same time, there is continuous feeding of phosphate ore in this area, which causes a lot of dust. The working environment is relatively harsh. When the tail gas flame is extinguished due to an accident, the tail gas intake valve continues to open for ventilation, causing a safety hazard of tail gas leakage. Summary of the invention

[0005] The utility model aims at the deficiencies of the prior art and provides a phosphate rock dryer with a simple structure, easy operation, high drying efficiency, safety and explosion-proof and explosion-proof safety ignition system; the problem of safe use of yellow phosphorus tail gas by the phosphate rock dryer is effectively solved.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The phosphate rock dryer with explosion-proof safety ignition system includes a drying drum, a rotating motor, an explosion-proof safety ignition system, a start button, a stop button, an alarm and a controller;

[0008] The explosion-proof safety ignition system includes the phosphorus furnace tail gas supply pipe, safety water seal, phosphorus furnace tail gas intake pipe, combustion air intake pipe, electronic igniter, and oxygen supply fan;

[0009] The drying drum is driven to rotate by a rotary motor, and the feeding end of the drying drum is provided with a phosphate ore feeding pipe, a phosphorus furnace tail gas inlet pipe, a combustion air inlet pipe and an electronic igniter;

[0010] The tail gas supply pipe of the phosphorus furnace is connected to the air inlet of the safety water seal, and the exhaust port of the safety water seal is connected to the tail gas inlet pipe of the phosphorus furnace. The tail gas inlet pipe of the phosphorus furnace is provided with an electric valve, a pneumatic valve and a pressure sensor in sequence; at the feeding end of the drying drum, the phosphorus furnace tail gas inlet pipe is provided in the combustion air inlet pipe, an electronic igniter is provided below the combustion air inlet pipe, and a flame detector is provided above the combustion air inlet pipe; the combustion air inlet pipe is connected to the air outlet of the oxygen supply fan;

[0011] A temperature sensor is provided at the discharge end of the drying drum;

[0012] The start button, the stop button, the alarm, the pressure sensor, the flame detector and the temperature sensor are connected to the controller through signal lines, and the controller is connected to the rotating motor, the electronic igniter, the oxygen supply fan, the electric valve, the pneumatic valve and the alarm through control lines.

[0013] The oxygen supply fan is a speed-regulating fan.

[0014] The electric valve is an electric regulating valve.

[0015] The controller is a DCS host, and the signal line and the control line are shielded lines.

[0016] During the drying process, the worker presses the start button, which transmits the signal to the controller. The controller rotates the motor and oxygen supply fan to run, opens the electric valve and pneumatic valve, and ignites the electronic igniter. The rotary motor drives the drying drum to rotate, and the phosphate ore enters the drying drum from the phosphate ore discharge pipe. The tail gas of the phosphorus furnace enters the safety water seal through the tail gas supply pipe of the phosphorus furnace. The safety water seal discharges the tail gas of the phosphorus furnace into the tail gas intake pipe of the phosphorus furnace. The tail gas of the phosphorus furnace is ignited by the electronic igniter at the feeding end of the drying drum to dry the phosphate ore, and the oxygen supply fan supplies oxygen to the flame.

[0017] The pressure sensor transmits the pressure signal of the tail gas in the tail gas inlet pipe of the phosphorus furnace to the controller, and the controller controls the electric valve to adjust the tail gas pressure in the tail gas inlet pipe of the phosphorus furnace within a certain range, thereby ensuring pressure stability.

[0018] The temperature sensor transmits the temperature signal of the discharge end of the drying drum to the controller, and the controller controls the oxygen supply fan to adjust the wind force to ensure the temperature of the discharge end of the drying drum is stable.

[0019] During the working process, due to the relatively bad working environment, when the flame of the phosphorus furnace tail gas is accidentally extinguished, and the flame detector does not detect the flame, the flame detector transmits the signal to the controller through the signal line, and the controller controls the alarm to alarm, reminding the staff that the flame is extinguished. At the same time, the controller controls the rotating motor to stop running, close the electric valve and pneumatic valve to prevent tail gas leakage, and stop running the oxygen supply fan after a period of time.

[0020] At the end of the work, the employee presses the stop button, which transmits the signal to the controller. The controller controls the extraction rotation motor and the oxygen supply fan to stop, and closes the electric valve and pneumatic valve.

[0021] Through the above steps, it is ensured that there are no safety hazards in the phosphate rock drying production.

[0022] Beneficial effects of the utility model:

[0023] 1. The utility model has the advantages of simple structure, easy operation, high drying efficiency and safety and explosion-proof.

[0024] 2. The utility model adopts a safety water seal to prevent backfire and ensure safety.

[0025] 3. The utility model adopts a flame detector to detect flames, which can prevent the electric valve and pneumatic valve from continuing to open for ventilation when the flame of the phosphorus furnace tail gas is accidentally extinguished, thereby causing safety hazards to the phosphorus furnace tail gas.

[0026] 4. The utility model adopts a flame detector, a controller and an alarm to remind the staff that the flame of the phosphorus furnace tail gas is extinguished.

[0027] 5. The utility model adopts a pressure sensor and an electric valve to control the pressure of the tail gas of the tail gas inlet pipe of the phosphorus furnace within a certain range, thereby ensuring the pressure stability.

[0028] 6. The utility model adopts a temperature sensor and an oxygen supply fan to control the temperature of the discharge end of the drying drum within a certain range, ensuring that the dust temperature is not too high, thereby protecting the subsequent dust recovery filter bag.

[0029] 7. The utility model adopts electric valve and pneumatic valve to ensure that when the tail gas flame of the phosphorus furnace is extinguished, the tail gas inlet pipe of the phosphorus furnace can be safely closed, which is safe and explosion-proof.

[0030] 8. The signal line and control line of the utility model adopt shielded line, which has high transmission rate and good anti-electromagnetic interference ability to ensure the safe operation of drying work.

[0031] 9. 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

[0032] Figure 1 It is a wiring diagram of the utility model.

[0033] 1-drying drum, 2-rotating motor, 3-explosion-proof safety ignition system, 4-start button, 5-stop button, 6-alarm, 7-controller, 8-phosphorus furnace tail gas supply pipe, 9-safety water seal, 10-phosphorus furnace tail gas intake pipe, 11-combustion air intake pipe, 12-electronic igniter, 13-oxygen supply fan, 14-phosphate ore discharge pipe, 15-electric valve, 16-pneumatic valve, 17-pressure sensor, 18-flame detector, 19-temperature sensor. DETAILED DESCRIPTION

[0034] like Figure 1 As shown, the phosphate rock dryer with explosion-proof safety ignition system includes a drying drum 1, a rotating motor 2, an explosion-proof safety ignition system 3, a start button 4, a stop button 5, an alarm 6 and a controller 7;

[0035] The explosion-proof safety ignition system 3 includes a phosphorus furnace tail gas supply pipe 8, a safety water seal 9, a phosphorus furnace tail gas intake pipe 10, a combustion air intake pipe 11, an electronic igniter 12, and an oxygen supply fan 13;

[0036] The drying drum 1 is driven to rotate by a rotary motor 2, and a phosphate ore discharge pipe 14, a phosphorus furnace tail gas intake pipe 10, a combustion air intake pipe 11 and an electronic igniter 12 are arranged at the feeding end of the drying drum 1;

[0037] The phosphorus furnace tail gas supply pipe 8 is connected to the air inlet of the safety water seal 9, and the exhaust port of the safety water seal 9 is connected to the phosphorus furnace tail gas inlet pipe 10, and the phosphorus furnace tail gas inlet pipe 10 is sequentially provided with an electric valve 15, a pneumatic valve 16 and a pressure sensor 17; at the feeding end of the drying drum 1, the phosphorus furnace tail gas inlet pipe 10 is provided in the combustion air inlet pipe 11, an electronic igniter 12 is provided below the combustion air inlet pipe 11, and a flame detector 18 is provided above the combustion air inlet pipe 11; the combustion air inlet pipe 11 is connected to the air outlet of the oxygen supply fan 13;

[0038] A temperature sensor 19 is provided at the discharge end of the drying drum 1;

[0039] The start button 4, the stop button 5, the alarm 6, the pressure sensor 17, the flame detector 18 and the temperature sensor 19 are connected to the controller 7 through signal lines, and the controller 7 is connected to the rotating motor 2, the electronic igniter 12, the oxygen supply fan 13, the electric valve 15, the pneumatic valve 16 and the alarm 6 through control lines.

[0040] The oxygen supply fan 13 is a speed-regulating fan.

[0041] The electric valve 15 is an electric regulating valve.

[0042] The controller 7 is a DCS host, and the signal line and the control line are shielded lines.

[0043] During the drying operation, the employee presses the start button 4, which transmits a signal to the controller 7. The controller 7 controls the rotation motor 2 and the oxygen supply fan 13 to operate, and opens the electric valve 15 and the pneumatic valve 16. The electronic igniter 12 ignites, and the rotation motor 2 drives the drying drum 1 to rotate, and the phosphate ore enters the drying drum 1 from the phosphate ore discharge pipe 14. The phosphorus furnace tail gas enters the safety water seal 9 through the phosphorus furnace tail gas supply pipe 8, and the safety water seal 9 discharges the phosphorus furnace tail gas into the phosphorus furnace tail gas intake pipe 10. The phosphorus furnace tail gas is ignited by the electronic igniter 12 at the feeding end of the drying drum 1 to dry the phosphate ore, and the oxygen supply fan 13 supplies oxygen to the flame.

[0044] The pressure sensor 17 transmits the pressure signal of the tail gas in the tail gas inlet pipe 10 of the phosphorus furnace to the controller 7. The controller 7 controls the electric valve 15 to adjust the tail gas pressure in the tail gas inlet pipe 10 of the phosphorus furnace to be within a certain range, thereby ensuring the pressure stability.

[0045] The temperature sensor 19 transmits the temperature signal of the discharge end of the drying drum 1 to the controller 7 , and the controller 7 controls the oxygen supply fan 13 to adjust the wind force, thereby ensuring that the temperature of the discharge end of the drying drum 1 is stable.

[0046] During the working process, due to the relatively bad working environment, when the flame of the phosphorus furnace tail gas is accidentally extinguished, the flame detector 18 does not detect the flame, and the flame detector 18 transmits the signal to the controller 7 through the signal line, and the controller 7 controls the alarm 6 to alarm, reminding the staff that the flame is extinguished. At the same time, the controller 7 controls the rotating motor 2 to stop running, closes the electric valve 15 and the pneumatic valve 16 to prevent tail gas leakage, and stops the oxygen supply fan 13 after a period of time.

[0047] When the work is finished, the employee presses the stop button 5, and the stop button 5 transmits a signal to the controller 7. The controller 7 controls the extraction rotation motor 2 and the oxygen supply fan 13 to stop, and closes the electric valve 15 and the pneumatic valve 16.

[0048] Through the above steps, it is ensured that there are no safety hazards in the phosphate rock drying production.

Claims

1. Phosphate rock dryer with explosion-proof safety ignition system, characterized in that: It comprises a drying drum (1), a rotating motor (2), an explosion-proof safety ignition system (3), a start button (4), a stop button (5), an alarm (6) and a controller (7); The explosion-proof safety ignition system (3) comprises a phosphorus furnace tail gas supply pipe (8), a safety water seal (9), a phosphorus furnace tail gas intake pipe (10), a combustion air intake pipe (11), an electronic igniter (12), and an oxygen supply fan (13); The drying drum (1) is driven to rotate by a rotary motor (2), and a phosphate ore discharge pipe (14), a phosphorus furnace tail gas intake pipe (10), a combustion air intake pipe (11) and an electronic igniter (12) are provided at the feeding end of the drying drum (1); The phosphorus furnace tail gas supply pipe (8) is connected to the air inlet of the safety water seal (9), and the exhaust port of the safety water seal (9) is connected to the phosphorus furnace tail gas inlet pipe (10). The phosphorus furnace tail gas inlet pipe (10) is provided with an electric valve (15), a pneumatic valve (16) and a pressure sensor (17) in sequence; at the feeding end of the drying drum (1), the phosphorus furnace tail gas inlet pipe (10) is provided in the combustion air inlet pipe (11), an electronic igniter (12) is provided below the combustion air inlet pipe (11), and a flame detector (18) is provided above the combustion air inlet pipe (11); the combustion air inlet pipe (11) is connected to the air outlet of the oxygen supply fan (13); A temperature sensor (19) is provided at the discharge end of the drying drum (1); The start button (4), the stop button (5), the alarm (6), the pressure sensor (17), the flame detector (18) and the temperature sensor (19) are connected to the controller (7) via signal lines. The controller (7) is connected to the rotating motor (2), the electronic igniter (12), the oxygen supply fan (13), the electric valve (15), the pneumatic valve (16) and the alarm (6) via control lines. The controller (7) is a DCS host, and the signal line and the control line are shielded lines.

2. The phosphate rock dryer with explosion-proof safety ignition system according to claim 1, characterized in that: The oxygen supply fan (13) is a speed-regulating fan.

3. The phosphate rock dryer with explosion-proof safety ignition system according to claim 1 or 2, characterized in that: The electric valve (15) is an electric regulating valve.

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