Safety interlock for nitrocellulose boiling and washing tank

Abstract

The utility model discloses a safety interlocking device of nitrocellulose boiling and washing barrel, including DCS system, nitrocellulose boiling and washing barrel top is connected with heating water pipeline, bottom is connected with discharge pipeline and wastewater pipeline, and the middle part of heating water pipeline is installed with first pneumatic regulating valve, and the water inlet of nitrocellulose boiling and washing barrel is installed with the explosion -proof tube close, and the second pneumatic regulating valve is installed on the explosion -proof tube, and the third pneumatic regulating valve and water taking valve are installed in parallel on the wastewater pipeline, and the water outlet is installed with the water -leakage detection sensor and fourth pneumatic regulating valve close, and the pressure sensor is installed in nitrocellulose boiling and washing barrel, and pressure sensor, water -leakage detection sensor, first pneumatic regulating valve, second pneumatic regulating valve, third pneumatic regulating valve and fourth pneumatic regulating valve all are connected with DCS system. The utility model discloses through water -leakage detection sensor real -time monitoring the nitrocellulose boiling and washing barrel has no boiling and washing water leakage condition, avoids the third pneumatic regulating valve water leakage and leads to the boiling and washing barrel water shortage steaming and cooking condition to occur.

Description

Technical Field

[0001] This utility model belongs to the technical field of nitrocellulose boiling and washing equipment, and relates to a safety interlock device for nitrocellulose boiling and washing tanks. Background Technology

[0002] Cellulose nitrate, commonly known as nitrocellulose or nitrocellulose, is a product of the reaction between cellulose and nitric acid. It has excellent film-forming properties. With the development of technology, the application of nitrocellulose is no longer limited to military products, but is reflected in all aspects of daily life, such as the manufacture of various paints, typing wax paper, inks, varnished cloth, bottle cap seals, adhesives, leather oil, nail polish, ester-soluble or water-soluble coatings, ping-pong balls, piano keys and other products.

[0003] The boiling and washing of nitrocellulose is a crucial step in the nitrocellulose production process. Its purpose is to stabilize the nitrocellulose and adjust its viscosity in high-temperature, high-pressure acidic water. This boiling and washing takes place inside a boiling and washing tank. Existing boiling and washing tanks have an internal filter plate that divides the internal space into upper and lower sections. An external circulation pipe connects the upper and lower sections of the tank. The nitrocellulose is located in the upper section. The external circulation pipe draws washing water from the lower section to the upper section, and the water then flows back through the filter plate to the lower section, thus circulating the washing water. This water circulation helps maintain a uniform temperature throughout the tank, ensuring a good washing effect for the nitrocellulose in different locations.

[0004] In recent years, several safety accidents have occurred in the nitrocellulose industry due to the failure to promptly detect and address water shortages in the boiling and washing tanks, leading to tank explosions. Therefore, to ensure the safety and reliability of the boiling and washing tanks during the boiling and washing of nitrocellulose and to improve the emergency response capabilities in case of emergencies, upgrading all boiling and washing safety facilities is a technical problem that the nitrocellulose production industry urgently needs to solve. Utility Model Content

[0005] The purpose of this invention is to provide a safety interlock device for nitrocellulose washing tanks, which solves the problem of poor safety in existing nitrocellulose washing tanks.

[0006] The technical solution adopted in this utility model is a safety interlock device for a nitrocellulose washing tank, including a DCS system. A heating water pipeline is connected to the top of the nitrocellulose washing tank, and a discharge pipeline and a wastewater pipeline are connected to the bottom. A first pneumatic regulating valve is installed in the middle of the heating water pipeline. An explosion-proof pipe is installed near the inlet of the heating water pipeline and is connected to the heating water pipeline. A second pneumatic regulating valve is installed on the explosion-proof pipe. A third pneumatic regulating valve and a water intake valve are installed in parallel near the inlet of the wastewater pipeline. A leakage detection sensor and a fourth pneumatic regulating valve are installed near the outlet of the wastewater pipeline. A pressure sensor is installed inside the nitrocellulose washing tank. The pressure sensor, leakage detection sensor, first pneumatic regulating valve, second pneumatic regulating valve, third pneumatic regulating valve, and fourth pneumatic regulating valve are all connected to the DCS system.

[0007] The DCS system includes a DCS controller, and the signal output terminals of the pressure sensor and the leakage detection sensor are connected to the signal input terminal of the DCS controller. The signal output terminal of the DCS controller is connected to the control terminals of the first pneumatic regulating valve, the second pneumatic regulating valve, the third pneumatic regulating valve and the fourth pneumatic regulating valve, respectively.

[0008] A fifth pneumatic regulating valve is installed on the heating water pipeline. The fifth pneumatic regulating valve is connected in parallel with the first pneumatic regulating valve. The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve.

[0009] A sixth pneumatic regulating valve is installed on the discharge pipeline, and the signal output terminal of the DCS controller is connected to the control terminal of the sixth pneumatic regulating valve.

[0010] The nitrocellulose washing tank is equipped with a temperature sensor and a liquid level sensor. The signal output terminals of the temperature sensor and the liquid level sensor are respectively connected to the signal input terminal of the DCS controller.

[0011] Different temperature sensors are installed in the upper, middle and lower parts of the nitrocellulose washing tank, while pressure and liquid level sensors are installed in the upper part of the nitrocellulose washing tank.

[0012] The water leakage detection sensor is an infrared light water leakage detection sensor.

[0013] The end of the explosion-proof pipe is installed inside the explosion-proof dike or near the explosion-proof wall.

[0014] The explosion-proof pipe is made of stainless steel.

[0015] The top of the nitrocellulose washing tank is connected to a steam inlet pipe and an exhaust gas outlet pipe. A steam inlet regulating valve is installed on the steam inlet pipe, and an exhaust gas regulating valve is installed on the exhaust gas outlet pipe. The signal output terminal of the DCS controller is connected to the steam inlet regulating valve and the exhaust gas regulating valve.

[0016] The beneficial effects of this utility model are as follows: (1) By installing a leak detection sensor and a fourth pneumatic regulating valve near the outlet of the wastewater pipeline, the leak detection sensor is used to monitor in real time whether there is any leakage of nitrocellulose washing tank, so as to avoid the situation of water shortage in the washing tank due to leakage of the third pneumatic regulating valve. (2) An explosion-proof pipe is installed near the inlet of the nitrocellulose washing tank on the heating water pipeline. A second pneumatic regulating valve is installed on the explosion-proof pipe. A pressure sensor is installed inside the nitrocellulose washing tank. The pressure sensor and the second pneumatic regulating valve are both connected to the DCS system to achieve interlocking. After the pressure inside the washing tank reaches the detonation pressure of the rupture disc, the signal is transmitted to the DCS controller. The DCS controller opens the second pneumatic regulating valve to release pressure, thus preventing the washing tank from exploding. (3) By installing different temperature sensors in the upper, middle and lower parts of the nitrocellulose washing tank, and installing pressure and liquid level sensors in the upper part of the nitrocellulose washing tank, the temperature, pressure and liquid level of the upper, middle and lower parts of the washing tank are connected to the DCS system and interlocked with the steam inlet regulating valve and exhaust gas regulating valve of the washing tank to improve the safety of the nitrocellulose washing process. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the safety interlock device for the nitrocellulose washing tank of this utility model.

[0018] In the diagram, 1. Nitrocellulose washing tank, 2. Heating water pipeline, 3. Discharge pipeline, 4. Wastewater pipeline, 5. First pneumatic regulating valve, 6. Explosion-proof pipe, 7. Second pneumatic regulating valve, 8. Third pneumatic regulating valve, 9. Water intake valve, 10. Leakage detection sensor, 11. Fourth pneumatic regulating valve, 12. Fifth pneumatic regulating valve, 13. Sixth pneumatic regulating valve, 14. Steam inlet pipe, 15. Waste gas outlet pipe, 16. Steam inlet regulating valve, 17. Waste gas regulating valve. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0020] Example 1 See Figure 1A safety interlock device for a nitrocellulose washing tank includes a DCS system. The top of the nitrocellulose washing tank 1 is connected to a heating water pipeline 2, and the bottom is connected to a discharge pipeline 3 and a wastewater pipeline 4. A first pneumatic regulating valve 5 is installed in the middle of the heating water pipeline 2. An explosion-proof pipe 6 is installed near the inlet of the heating water pipeline 2, and is connected to the heating water pipeline 2. A second pneumatic regulating valve 7 is installed on the explosion-proof pipe 6. A third pneumatic regulating valve 8 and a water intake valve 9 are installed in parallel near the inlet of the wastewater pipeline 4. A leakage detection sensor 10 and a fourth pneumatic regulating valve 11 are installed sequentially along the water flow direction near the outlet of the wastewater pipeline 4. A pressure sensor is installed inside the nitrocellulose washing tank 1. The pressure sensor, leakage detection sensor 10, first pneumatic regulating valve 5, second pneumatic regulating valve 7, third pneumatic regulating valve 8, and fourth pneumatic regulating valve 11 are all connected to the DCS system.

[0021] The DCS system includes a DCS controller, a pressure sensor, and a leakage detection sensor 10. The signal output terminals of the pressure sensor and the leakage detection sensor 10 are connected to the signal input terminals of the DCS controller. The signal output terminals of the DCS controller are respectively connected to the control terminals of the first pneumatic regulating valve 5, the second pneumatic regulating valve 7, the third pneumatic regulating valve 8, and the fourth pneumatic regulating valve 11.

[0022] A DCS system, or Distributed Control System, is an automated system used for industrial process control. It combines mechanical and electrical equipment, computer software, and network technology. A DCS system typically consists of hardware and software such as a central processing unit (CPU), input / output modules, operator stations, and engineer stations. It connects field control stations and the control center via a network to achieve distributed control and centralized management of production equipment. DCS enables automated control, real-time monitoring, and data acquisition, improving production efficiency and product quality.

[0023] This invention involves installing a leak detection sensor and a fourth pneumatic regulating valve near the outlet of the wastewater pipeline. The leak detection sensor is used to monitor in real time whether there is any leakage of washing water in the nitrocellulose washing tank, so as to avoid the washing tank running out of water due to leakage of the third pneumatic regulating valve. When leakage of the third pneumatic regulating valve is detected, the fourth pneumatic regulating valve is quickly closed by the DCS controller to prevent further leakage.

[0024] An explosion-proof pipe is installed near the inlet of the nitrocellulose washing tank on the heating water pipeline. A second pneumatic regulating valve is installed on the explosion-proof pipe. A pressure sensor is installed inside the nitrocellulose washing tank. Both the pressure sensor and the second pneumatic regulating valve are connected to the DCS system to achieve interlocking. When the pressure inside the washing tank reaches the detonation pressure of the rupture disc, the signal is transmitted to the DCS controller. The DCS controller opens the second pneumatic regulating valve to release pressure, thus preventing the washing tank from exploding.

[0025] Example 2 A safety interlock device for a nitrocellulose washing tank includes a DCS system, which includes a DCS controller. The top of the nitrocellulose washing tank 1 is connected to a heating water pipeline 2, and the bottom is connected to a discharge pipeline 3 and a wastewater pipeline 4. A first pneumatic regulating valve 5 is installed in the middle of the heating water pipeline 2. An explosion-proof pipe 6 is installed near the inlet of the heating water pipeline 2 and is connected to the heating water pipeline 2. A second pneumatic regulating valve 7 is installed on the explosion-proof pipe 6. A third pneumatic regulating valve 8 and a water intake valve 9 are installed in parallel near the inlet of the wastewater pipeline 4. A leakage detection sensor 10 and a fourth pneumatic regulating valve 11 are installed near the outlet of the wastewater pipeline 4. A pressure sensor is installed inside the nitrocellulose washing tank 1.

[0026] The signal output terminals of the pressure sensor and the leakage detection sensor 10 are connected to the signal input terminal of the DCS controller. The signal output terminal of the DCS controller is connected to the control terminals of the first pneumatic regulating valve 5, the second pneumatic regulating valve 7, the third pneumatic regulating valve 8, and the fourth pneumatic regulating valve 11, respectively.

[0027] A fifth pneumatic regulating valve 12 is installed on the heating water pipeline 2. The fifth pneumatic regulating valve 12 is connected in parallel with the first pneumatic regulating valve 5. The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve 12.

[0028] The fifth pneumatic regulating valve 12 and the first pneumatic regulating valve 5 form a dual-valve control structure to prevent the first pneumatic regulating valve 5 from failing and being unable to replenish water to the nitrocellulose washing tank.

[0029] A sixth pneumatic regulating valve 13 is installed on the discharge pipeline 3. The signal output terminal of the DCS controller is connected to the control terminal of the sixth pneumatic regulating valve 13 to control the discharge process of the nitrocellulose washing tank.

[0030] Example 3 A safety interlock device for a nitrocellulose washing tank includes a DCS system, which includes a DCS controller. The top of the nitrocellulose washing tank 1 is connected to a heating water pipeline 2, and the bottom is connected to a discharge pipeline 3 and a wastewater pipeline 4. A first pneumatic regulating valve 5 is installed in the middle of the heating water pipeline 2. An explosion-proof pipe 6 is installed near the inlet of the heating water pipeline 2 and is connected to the heating water pipeline 2. A second pneumatic regulating valve 7 is installed on the explosion-proof pipe 6. A third pneumatic regulating valve 8 and a water intake valve 9 are installed in parallel near the inlet of the wastewater pipeline 4. A leakage detection sensor 10 and a fourth pneumatic regulating valve 11 are installed near the outlet of the wastewater pipeline 4. A pressure sensor is installed inside the nitrocellulose washing tank 1.

[0031] The signal output terminals of the pressure sensor and the leakage detection sensor 10 are connected to the signal input terminal of the DCS controller. The signal output terminal of the DCS controller is connected to the control terminals of the first pneumatic regulating valve 5, the second pneumatic regulating valve 7, the third pneumatic regulating valve 8, and the fourth pneumatic regulating valve 11, respectively.

[0032] A fifth pneumatic regulating valve 12 is installed on the heating water pipeline 2. The fifth pneumatic regulating valve 12 is connected in parallel with the first pneumatic regulating valve 5. The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve 12.

[0033] A sixth pneumatic regulating valve 13 is installed on the discharge pipeline 3, and the signal output terminal of the DCS controller is connected to the control terminal of the sixth pneumatic regulating valve 13.

[0034] The nitrocellulose washing tank 1 is equipped with a temperature sensor and a liquid level sensor. The signal output terminals of the temperature sensor and the liquid level sensor are respectively connected to the signal input terminal of the DCS controller.

[0035] Temperature sensors are installed in the upper, middle and lower parts of the nitrocellulose washing tank 1, while pressure sensors and liquid level sensors are installed in the upper part of the nitrocellulose washing tank 1.

[0036] When the liquid level in the washing tub is detected to be below the threshold, the DCS controller opens the first pneumatic regulating valve 5. When the first pneumatic regulating valve 5 fails, the fifth pneumatic regulating valve 12 is opened to introduce hot water and replenish the washing tub.

[0037] The water leakage detection sensor 10 is an infrared light water leakage detection sensor, model WL10. It is small and thin, with high sensitivity. It can detect leaks without the need for a light shield and amplifier circuit, and the detection method is infrared reflection. It has an IP67 waterproof rating.

[0038] The leakage detection sensor is used to monitor in real time whether there is any leakage of washing water in the nitrocellulose washing tank. If the leakage detection sensor detects that the wastewater pipeline is still draining when the third pneumatic regulating valve is closed, it indicates that the third pneumatic regulating valve has malfunctioned and is leaking. Here, if the liquid level detected by the liquid level sensor in the nitrocellulose washing tank is too low and below the threshold, the first pneumatic regulating valve 5 and the fifth pneumatic regulating valve 12 are opened, while the fourth pneumatic regulating valve 11 is closed. If the liquid level detected by the liquid level sensor in the nitrocellulose washing tank is higher than the minimum threshold, the fourth pneumatic regulating valve 11 is closed to prevent the nitrocellulose washing tank from continuing to leak water, thereby avoiding the situation where the washing tank is short of water for boiling due to leakage of the third pneumatic regulating valve.

[0039] Example 4 A safety interlock device for a nitrocellulose washing tank includes a DCS system, which includes a DCS controller. The top of the nitrocellulose washing tank 1 is connected to a heating water pipeline 2, and the bottom is connected to a discharge pipeline 3 and a wastewater pipeline 4. A first pneumatic regulating valve 5 is installed in the middle of the heating water pipeline 2. An explosion-proof pipe 6 is installed near the inlet of the heating water pipeline 2 and is connected to the heating water pipeline 2. A second pneumatic regulating valve 7 is installed on the explosion-proof pipe 6. A third pneumatic regulating valve 8 and a water intake valve 9 are installed in parallel near the inlet of the wastewater pipeline 4. A leakage detection sensor 10 and a fourth pneumatic regulating valve 11 are installed near the outlet of the wastewater pipeline 4. A pressure sensor is installed inside the nitrocellulose washing tank 1.

[0040] The signal output terminals of the pressure sensor and the leakage detection sensor 10 are connected to the signal input terminal of the DCS controller. The signal output terminal of the DCS controller is connected to the control terminals of the first pneumatic regulating valve 5, the second pneumatic regulating valve 7, the third pneumatic regulating valve 8, and the fourth pneumatic regulating valve 11, respectively.

[0041] A fifth pneumatic regulating valve 12 is installed on the heating water pipeline 2. The fifth pneumatic regulating valve 12 is connected in parallel with the first pneumatic regulating valve 5. The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve 12.

[0042] A sixth pneumatic regulating valve 13 is installed on the discharge pipeline 3, and the signal output terminal of the DCS controller is connected to the control terminal of the sixth pneumatic regulating valve 13.

[0043] The nitrocellulose washing tank 1 is equipped with a temperature sensor and a liquid level sensor. The signal output terminals of the temperature sensor and the liquid level sensor are respectively connected to the signal input terminals of the DCS controller. Temperature sensors are installed in the upper, middle and lower parts of the nitrocellulose washing tank 1, while pressure sensors and liquid level sensors are installed in the upper part of the nitrocellulose washing tank 1.

[0044] Leakage detection sensor 10 is an infrared light leakage detection sensor. The end of explosion-proof pipe 6 is installed inside the explosion-proof dike or near the explosion-proof wall. Explosion-proof pipe 6 is made of stainless steel.

[0045] Example 5 A safety interlock device for a nitrocellulose washing tank includes a DCS system, which includes a DCS controller. The top of the nitrocellulose washing tank 1 is connected to a heating water pipeline 2, and the bottom is connected to a discharge pipeline 3 and a wastewater pipeline 4. A first pneumatic regulating valve 5 is installed in the middle of the heating water pipeline 2. An explosion-proof pipe 6 is installed near the inlet of the heating water pipeline 2 and is connected to the heating water pipeline 2. A second pneumatic regulating valve 7 is installed on the explosion-proof pipe 6. A third pneumatic regulating valve 8 and a water intake valve 9 are installed in parallel near the inlet of the wastewater pipeline 4. A leakage detection sensor 10 and a fourth pneumatic regulating valve 11 are installed near the outlet of the wastewater pipeline 4. A pressure sensor is installed inside the nitrocellulose washing tank 1.

[0046] The signal output terminals of the pressure sensor and the leakage detection sensor 10 are connected to the signal input terminal of the DCS controller. The signal output terminal of the DCS controller is connected to the control terminals of the first pneumatic regulating valve 5, the second pneumatic regulating valve 7, the third pneumatic regulating valve 8, and the fourth pneumatic regulating valve 11, respectively.

[0047] A fifth pneumatic regulating valve 12 is installed on the heating water pipeline 2. The fifth pneumatic regulating valve 12 is connected in parallel with the first pneumatic regulating valve 5. The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve 12.

[0048] The top of the nitrocellulose washing tank 1 is connected to a steam inlet pipe 14 and an exhaust gas outlet pipe 15. A steam inlet regulating valve 16 is installed on the steam inlet pipe 14, and an exhaust gas regulating valve 17 is installed on the exhaust gas outlet pipe 15. The signal output terminal of the DCS controller is connected to the steam inlet regulating valve 16 and the exhaust gas regulating valve 17.

[0049] Example 6 A safety interlock device for a nitrocellulose washing tank includes a DCS system, which includes a DCS controller. The top of the nitrocellulose washing tank 1 is connected to a heating water pipeline 2, and the bottom is connected to a discharge pipeline 3 and a wastewater pipeline 4. A first pneumatic regulating valve 5 is installed in the middle of the heating water pipeline 2. An explosion-proof pipe 6 is installed near the inlet of the heating water pipeline 2 and is connected to the heating water pipeline 2. A second pneumatic regulating valve 7 is installed on the explosion-proof pipe 6. A third pneumatic regulating valve 8 and a water intake valve 9 are installed in parallel near the inlet of the wastewater pipeline 4. A leakage detection sensor 10 and a fourth pneumatic regulating valve 11 are installed near the outlet of the wastewater pipeline 4. A pressure sensor is installed inside the nitrocellulose washing tank 1.

[0050] The signal output terminals of the pressure sensor and the leakage detection sensor 10 are connected to the signal input terminal of the DCS controller. The signal output terminal of the DCS controller is connected to the control terminals of the first pneumatic regulating valve 5, the second pneumatic regulating valve 7, the third pneumatic regulating valve 8, and the fourth pneumatic regulating valve 11, respectively.

[0051] A fifth pneumatic regulating valve 12 is installed on the heating water pipeline 2. The fifth pneumatic regulating valve 12 is connected in parallel with the first pneumatic regulating valve 5. The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve 12.

[0052] A sixth pneumatic regulating valve 13 is installed on the discharge pipeline 3, and the signal output terminal of the DCS controller is connected to the control terminal of the sixth pneumatic regulating valve 13.

[0053] The nitrocellulose washing tank 1 is equipped with a temperature sensor and a liquid level sensor. The signal output terminals of the temperature sensor and the liquid level sensor are respectively connected to the signal input terminals of the DCS controller. Temperature sensors are installed in the upper, middle and lower parts of the nitrocellulose washing tank 1, while pressure sensors and liquid level sensors are installed in the upper part of the nitrocellulose washing tank 1.

[0054] The explosion-proof pipe 6 is installed at its end inside the explosion-proof dike or near the explosion-proof wall. The explosion-proof pipe 6 is made of stainless steel.

[0055] The top of the nitrocellulose washing tank 1 is connected to a steam inlet pipe 14 and an exhaust gas outlet pipe 15. A steam inlet regulating valve 16 is installed on the steam inlet pipe 14, and an exhaust gas regulating valve 17 is installed on the exhaust gas outlet pipe 15. The signal output terminal of the DCS controller is connected to the steam inlet regulating valve 16 and the exhaust gas regulating valve 17.

[0056] This invention features an explosion-proof pipe installed near the inlet of the nitrocellulose washing tank on the heating water pipeline. A second pneumatic regulating valve is mounted on the explosion-proof pipe. A pressure sensor is installed inside the nitrocellulose washing tank. Both the pressure sensor and the second pneumatic regulating valve are connected to the DCS system for interlocking. When the pressure inside the washing tank reaches the detonation pressure of the rupture disc, a signal is transmitted to the DCS controller. The DCS controller then opens the second pneumatic regulating valve to release pressure, preventing the washing tank from exploding and improving the safe production capacity of the nitrocellulose washing tank.

Claims

1. A safety interlock device for a nitrocellulose washing tank, characterized in that, The DCS system includes a heating water pipeline (2) connected to the top of the nitrocellulose washing tank (1), and a discharge pipeline (3) and a wastewater pipeline (4) connected to the bottom. A first pneumatic regulating valve (5) is installed in the middle of the heating water pipeline (2). An explosion-proof pipe (6) is installed near the inlet of the nitrocellulose washing tank (1) of the heating water pipeline (2). The explosion-proof pipe (6) is connected to the heating water pipeline (2). A second pneumatic regulating valve (7) is installed on the explosion-proof pipe (6). The wastewater pipeline (4) is located near the inlet of the nitrocellulose washing tank (1). A third pneumatic regulating valve (8) and a water intake valve (9) are installed in parallel at the water outlet. A leak detection sensor (10) and a fourth pneumatic regulating valve (11) are installed near the outlet of the wastewater pipeline (4). A pressure sensor is installed inside the nitrocellulose washing tank (1). The pressure sensor, the leak detection sensor (10), the first pneumatic regulating valve (5), the second pneumatic regulating valve (7), the third pneumatic regulating valve (8), and the fourth pneumatic regulating valve (11) are all connected to the DCS system.

2. The safety interlock device for the nitrocellulose washing tank according to claim 1, characterized in that, The DCS system includes a DCS controller, a pressure sensor and a leakage detection sensor (10). The signal output terminals of the DCS controller are connected to the signal input terminals of the DCS controller. The signal output terminals of the DCS controller are respectively connected to the control terminals of the first pneumatic regulating valve (5), the second pneumatic regulating valve (7), the third pneumatic regulating valve (8) and the fourth pneumatic regulating valve (11).

3. The safety interlock device for the nitrocellulose washing tank according to claim 2, characterized in that, The heating water pipeline (2) is equipped with a fifth pneumatic regulating valve (12), which is connected in parallel with the first pneumatic regulating valve (5). The signal output terminal of the DCS controller is connected to the control terminal of the fifth pneumatic regulating valve (12).

4. The safety interlock device for the nitrocellulose washing tank according to claim 2, characterized in that, The discharge pipeline (3) is equipped with a sixth pneumatic regulating valve (13), and the signal output terminal of the DCS controller is connected to the control terminal of the sixth pneumatic regulating valve (13).

5. The safety interlock device for the nitrocellulose washing tank according to claim 2, characterized in that, The nitrocellulose washing tank (1) is equipped with a temperature sensor and a liquid level sensor. The signal output terminals of the temperature sensor and the liquid level sensor are respectively connected to the signal input terminal of the DCS controller.

6. The safety interlock device for the nitrocellulose washing tank according to claim 5, characterized in that, Temperature sensors are installed in the upper, middle and lower parts of the nitrocellulose washing tank (1), while pressure sensors and liquid level sensors are installed in the upper part of the nitrocellulose washing tank (1).

7. The safety interlock device for the nitrocellulose washing tank according to claim 1, characterized in that, The water leakage detection sensor (10) is an infrared light water leakage detection sensor.

8. The safety interlock device for the nitrocellulose washing tank according to claim 1, characterized in that, The explosion-proof pipe (6) is installed at its end inside the explosion-proof dike or near the explosion-proof wall.

9. The safety interlock device for the nitrocellulose washing tank according to claim 1, characterized in that, The explosion-proof pipe (6) is a stainless steel pipe.

10. The safety interlock device for the nitrocellulose washing tank according to claim 2, characterized in that, The top of the nitrocellulose washing tank (1) is connected to a steam inlet pipe (14) and a waste gas outlet pipe (15). A steam inlet regulating valve (16) is installed on the steam inlet pipe (14), and a waste gas regulating valve (17) is installed on the waste gas outlet pipe (15). The signal output terminal of the DCS controller is connected to the steam inlet regulating valve (16) and the waste gas regulating valve (17).

Images