Safety device for preventing splashing of yellow phosphorus in yellow phosphorus refining recovery vent line

Abstract

The utility model discloses a safety device for preventing yellow phosphorus from splashing in the refined recovery emptying pipeline, which relates to the technical scheme that comprises a phosphorus receiving tank and a refining pot, the upper outlet of the phosphorus receiving tank is communicated with the top inlet of the refining pot through a pipeline, an emptying pipeline is arranged on the pipeline between the phosphorus receiving tank and the refining pot, two branch bypasses are arranged on the emptying pipeline, one is a hot water pipeline, and the other is connected to a collecting tank, a pipeline is further arranged on the upper part of the sidewall of the collecting tank and connected with a U-shaped overflow pipe, and the U-shaped overflow pipe is connected to a sewage treatment system. The utility model has the beneficial effects that (1) the risk of yellow phosphorus splashing is completely eliminated, and the personal safety of the operators is ensured; (2) the residual yellow phosphorus is recovered and the pollution is reduced, and the economic benefits and environmental protection requirements are considered.

Description

Technical Field

[0001] This utility model belongs to the field of yellow phosphorus production technology, and in particular relates to a safety device to prevent yellow phosphorus from splashing in the yellow phosphorus refining and recovery venting pipeline. Background Technology

[0002] Yellow phosphorus has an extremely wide range of applications and is one of the most important chemical raw materials, forming part of my country's basic phosphorus chemical industry. In the electric furnace method for preparing yellow phosphorus, raw materials (phosphate rock, silica, and coke) react at a high temperature of 1300–1500℃ to generate gaseous phosphorus (P4 vapor). Subsequently, it is converted into liquid phosphorus through a spray cooling system and falls back into the phosphorus receiving tank. It is then transported through pipelines using a siphon method to a refining pot for rinsing to produce high-purity yellow phosphorus.

[0003] During this process, the yellow phosphorus refining and recovery venting pipeline needs to be preheated and flushed before and after the operation. Yellow phosphorus is highly toxic; approximately 0.1g can be fatal to a person. If residual yellow phosphorus remains in the yellow phosphorus refining venting pipeline, it can easily splash onto on-site workers, causing serious chemical burns, poisoning, or even safety and environmental accidents. Summary of the Invention

[0004] To address the problem of yellow phosphorus easily splashing onto on-site workers in the aforementioned prior art, this utility model provides a safety device to prevent yellow phosphorus from splashing onto the venting pipeline of yellow phosphorus refining and recovery. The technical solution includes a phosphorus receiving tank and a refining pot. The upper outlet of the phosphorus receiving tank is connected to the top inlet of several refining pots via a pipe. A venting pipe is provided on the pipe between the phosphorus receiving tank and the refining pots. The venting pipe has two branch bypasses, one of which is a hot water pipe and the other is connected to a collection tank. The upper side wall of the collection tank is also provided with a pipe connected to a U-shaped overflow pipe, which is connected to a sewage treatment system.

[0005] In a preferred embodiment, a first pneumatic valve is provided at the upper outlet of the phosphorus receiving tank, and the opening and closing of the first pneumatic valve is controlled by the DCS control system.

[0006] In a preferred embodiment, a second pneumatic valve is provided at the top inlet of the refining pot, and the opening and closing of the second pneumatic valve is controlled by the DCS control system; an overflow pipe is also provided on the upper side wall of the refining pot, and the overflow pipe is connected to the sewage treatment system.

[0007] In a preferred embodiment, a third pneumatic valve is installed on the hot water pipe, and the opening and closing of the third pneumatic valve is controlled by the DCS control system.

[0008] In a preferred embodiment, the other bypass pipe extends to the bottom of the collection tank to prevent backflow.

[0009] In a preferred embodiment, the top of the collection tank is provided with a protective cover, and a gap is reserved between the collection tank and the protective cover to prevent an explosion caused by excessive pressure inside the collection tank.

[0010] In a preferred embodiment, the order of height of the phosphorus receiving tank, the refining pot, and the venting pipe from high to low is: venting pipe, phosphorus receiving tank, and refining pot.

[0011] The beneficial effects of this utility model are: (1) The problem of yellow phosphorus splashing is completely solved by the triple safety protection design. First, the branch bypass of the vent pipe extends directly to the bottom of the collection tank, so that the residual yellow phosphorus flows smoothly into the sewage in the tank along the pipe, avoiding direct contact with air and splashing. Second, the top of the collection tank is equipped with a protective cover to further block yellow phosphorus splashing in case of accident, while leaving a gap to balance the pressure in the tank and prevent explosion caused by excessive pressure, forming a secondary safety guarantee. Third, the water seal of the U-shaped overflow pipe can prevent air backflow and yellow phosphorus vapor from escaping. Multiple protections reduce the risk of yellow phosphorus contact to the minimum, and fundamentally protect the occupational health and safety of on-site workers. (2) In the existing venting methods, residual yellow phosphorus in the pipeline is often directly discharged, which not only wastes resources, but also easily causes environmental pollution due to spontaneous combustion of yellow phosphorus. The collection tank of this utility model can efficiently collect residual yellow phosphorus in the venting pipeline, and can be reused after regular recycling, thereby improving the utilization rate of yellow phosphorus resources and creating additional economic benefits for enterprises. At the same time, the sewage in the collection tank is transported to the sewage treatment system through the U-shaped overflow pipe to realize the recycling of water resources, avoid soil and water pollution caused by direct discharge of yellow phosphorus, meet the environmental protection discharge requirements, and achieve the synergistic unity of safety, environmental protection and benefits. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] In the diagram: 1. Phosphorus receiving tank; 101. First pneumatic valve; 2. Refining pot; 201. Overflow pipe; 202. Second pneumatic valve; 3. Vent pipe; 301. Vent valve; 4. Hot water pipe; 401. Third pneumatic valve; 5. Collection tank; 6. Collection tank protective cover; 7. U-shaped overflow pipe; 8. DCS control system. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Example like Figure 1The safety device shown is for preventing splashing of yellow phosphorus in the venting pipeline of yellow phosphorus refining and recovery. It includes a phosphorus receiving tank 1 and a refining pot 2. The upper outlet of the phosphorus receiving tank 1 is connected to the top inlet of four refining pots 2 through a pipe. A venting pipe 3 is provided on the pipe between the phosphorus receiving tank 1 and the refining pots 2. The venting pipe 3 has two branch bypasses, one of which is a hot water pipe 4 and the other is connected to a collection tank 5. The upper side wall of the collection tank 5 is also provided with a pipe connected to a U-shaped overflow pipe 7, which is connected to a sewage treatment system.

[0016] Furthermore, a first pneumatic valve 101 is provided at the upper outlet of the phosphorus receiving tank 1, and the opening and closing of the first pneumatic valve 101 is controlled by the DCS control system 8.

[0017] Furthermore, a second pneumatic valve 202 is provided at the top inlet of the refining pot 2, and the opening and closing of the second pneumatic valve 202 is controlled by the DCS control system 8; an overflow pipe 201 is also provided on the upper side wall of the refining pot 2, and the overflow pipe 201 is connected to the sewage treatment system.

[0018] Furthermore, a third pneumatic valve 401 is installed on the hot water pipe 4, and the opening and closing of the third pneumatic valve 401 is controlled by the DCS control system 8.

[0019] Furthermore, the other bypass pipe extends to the bottom of the collection tank 5 to prevent backflow.

[0020] Furthermore, the top of the collection tank 5 is provided with a collection tank protective cover 6, and a gap is reserved between the collection tank 5 and the collection tank protective cover 6 to prevent an explosion caused by excessive pressure inside the collection tank 5.

[0021] Furthermore, the order of height of the phosphorus receiving tank 1, the refining pot 2, and the venting pipe 3 from high to low is: venting pipe 3, phosphorus receiving tank 1, and refining pot 2.

[0022] The process of using the above-mentioned device is as follows: The DCS control system 8 synchronously opens the first pneumatic valve 101 at the outlet of the phosphorus receiving tank 1 and the second pneumatic valve 202 at the inlet of the target refining pot 2 (if multiple pots are used in parallel, the corresponding second pneumatic valves can be opened sequentially), and activates the third pneumatic valve 401 on the hot water pipe 4 to release hot water into the refining pot 2. Since the device height is designed so that the vent pipe 3 > phosphorus receiving tank 1 > refining pot 2, the yellow phosphorus in the phosphorus receiving tank flows smoothly into the refining pot 2 through the main pipe by siphon under the action of gravity and negative pressure. During the transportation process, the DCS system monitors the status of each pneumatic valve and the liquid level of the refining pot 2 in real time. If there is too much rinsing water in the refining pot 2, the overflow pipe 201 on the upper side wall will automatically discharge the excess sewage into the sewage treatment system to avoid overflow. When the yellow phosphorus liquid level in the phosphorus receiving tank 1 drops to the preset lower limit (judged by the DCS liquid level monitoring function), it is confirmed that the siphon transportation is close to completion.

[0023] The DCS control system 8 closes the first pneumatic valve 101 at the outlet of the phosphorus receiving tank 1 and simultaneously opens the vent valve 301 on the venting pipe 3 to interrupt the siphon process. At this time, the residual yellow phosphorus and phosphorus vapor in the main pipe and the venting pipe 3 flow into the sewage in the collection tank 5 along the bypass pipe of the venting pipe. Because the pipe end is submerged in the sewage and the collection tank is covered by a protective cover 6, the yellow phosphorus will not come into direct contact with the air and splash, and the phosphorus vapor will not escape. Venting continues until no residual yellow phosphorus flows out of the pipeline. During this period, if the sewage in the collection tank 5 reaches the overflow port, it will automatically flow into the sewage treatment system through the U-shaped overflow pipe 7. The U-shaped structure can form a water seal to prevent air from flowing back into the collection tank 6. If the DCS system detects an abnormal increase in pressure in the collection tank 5 (such as a small amount of phosphorus vapor accumulating), its reserved gap can automatically balance the pressure to avoid the risk of explosion.

Claims

1. A safety device for preventing splashing of yellow phosphorus in a yellow phosphorus refining and recovery venting pipeline, characterized in that, It includes a phosphorus receiving tank (1) and a refining pot (2). The upper outlet of the phosphorus receiving tank (1) is connected to the top inlet of several refining pots (2) through a pipe. A vent pipe (3) is provided on the pipe between the phosphorus receiving tank (1) and the refining pot (2). The vent pipe (3) is provided with two branch bypasses, one of which is a hot water pipe (4) and the other is a bypass pipe. The bypass pipe is connected to a collection tank (5). The upper side wall of the collection tank (5) is also provided with a pipe connected to a U-shaped overflow pipe (7). The U-shaped overflow pipe (7) is connected to a sewage treatment system.

2. The safety device for preventing splashing of yellow phosphorus in the yellow phosphorus refining and recovery venting pipeline according to claim 1, characterized in that, A first pneumatic valve (101) is provided at the upper outlet of the phosphorus receiving tank (1), and the opening and closing of the first pneumatic valve (101) is controlled by the DCS control system (8).

3. The safety device for preventing splashing of yellow phosphorus in the yellow phosphorus refining and recovery venting pipeline according to claim 1, characterized in that, A second pneumatic valve (202) is provided at the top inlet of the refining pot (2), and the opening and closing of the second pneumatic valve (202) is controlled by the DCS control system (8); an overflow pipe (201) is also provided on the upper side wall of the refining pot (2), and the overflow pipe (201) is connected to the sewage treatment system.

4. The safety device for preventing splashing of yellow phosphorus in the yellow phosphorus refining and recovery venting pipeline according to claim 1, characterized in that, A third pneumatic valve (401) is installed on the hot water pipe (4), and the opening and closing of the third pneumatic valve (401) is controlled by the DCS control system (8).

5. The safety device for preventing splashing of yellow phosphorus in the yellow phosphorus refining and recovery venting pipeline according to claim 1, characterized in that, The bypass pipe extends to the bottom of the collection tank (5) to prevent backflow.

6. The safety device for preventing splashing of yellow phosphorus in the yellow phosphorus refining and recovery venting pipeline according to claim 1, characterized in that, The top of the collection tank (5) is provided with a collection tank protective cover (6), and a gap is reserved between the collection tank (5) and the collection tank protective cover (6) to prevent the collection tank (5) from exploding due to excessive pressure.

7. The safety device for preventing splashing of yellow phosphorus in the yellow phosphorus refining and recovery venting pipeline according to claim 1, characterized in that, The order of height of the phosphorus receiving tank (1), refining pot (2) and venting pipe (3) from high to low is venting pipe (3), phosphorus receiving tank (1), refining pot (2).

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