Purification device for exhaust gas from yellow phosphorus electric furnace

Abstract

This utility model discloses a purification device for exhaust gas from a yellow phosphorus electric furnace. The device includes a dust filter chamber and a filter tower. An air inlet pipe is located at the top of the dust filter chamber, and double filter bags are installed inside via a motor-driven rotating frame to alternately intercept solid dust in the exhaust gas. The dust filter chamber is connected to the filter tower via an air supply pipe, which is equipped with a backwash pipe with an electrically controlled three-way valve. Inside the filter tower, from bottom to top, are a guide plate, multiple layers of filter screens, and an activated carbon packing layer. A steam pipeline with multiple output branches is connected to the side wall, and the steam pipeline is also connected to a sleeve outside the drain pipe. By adopting the above structure, this utility model can efficiently remove solid dust, gaseous yellow phosphorus, and fluorides from the exhaust gas. The purified exhaust gas meets the heating gas requirements for food-grade phosphates, avoiding product appearance defects. Furthermore, the equipment operates continuously, is easy to maintain, and possesses good practicality and economy.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically a purification device for tail gas from a yellow phosphorus electric furnace. Background Technology

[0002] Yellow phosphorus, as an important basic chemical raw material, is widely used in pesticides, pharmaceuticals, flame retardants, phosphates, and many other fields. In the traditional production process of yellow phosphorus, the electric furnace method is one of the mainstream production processes. However, this process generates a large amount of electric furnace exhaust gas, which contains various impurities that are detrimental to the environment and subsequent production. This has become one of the key issues restricting the green development of the yellow phosphorus industry and the improvement of product quality.

[0003] Currently, using the exhaust gas from yellow phosphorus electric furnaces as fuel for heating food-grade phosphates can effectively recover heat energy from the exhaust gas, reduce energy consumption, and lower production costs. However, if the exhaust gas from yellow phosphorus electric furnaces is directly used as fuel for heating food-grade phosphates, pre-purification is required. However, existing technologies such as water washing and electrostatic precipitators have significant technical drawbacks: water washing cannot completely remove the mist-like suspended matter formed by the condensation of gaseous yellow phosphorus; electrostatic precipitators have weak removal capabilities for gaseous yellow phosphorus and fluorides. If the exhaust gas treated by these two processes is used as heating fuel, residual impurities will cause black spots and other appearance defects in the food-grade phosphates, failing to meet food-grade product quality standards and affecting production and use. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a purification device for the exhaust gas of yellow phosphorus electric furnace, which can solve the technical problem that existing water washing and electrostatic dust removal processes cannot completely remove solid dust, gaseous yellow phosphorus and fluorides from the exhaust gas of yellow phosphorus electric furnace, resulting in residual impurities in the purified exhaust gas causing black spots and other appearance defects in the food-grade phosphate when it is used as fuel for heating, thus failing to meet quality standards.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a purification device for tail gas of yellow phosphorus electric furnace, including a dust filter chamber, an air inlet pipe at the top of the dust filter chamber, an air supply pipe at the bottom of the dust filter chamber connected to the lower part of the filter tower, and an exhaust pipe at the top of the filter tower. The dust filtration chamber is equipped with a filter bag, which is located at the outlet end of the air inlet pipe. The filter tower is equipped with a filter screen, and one end of the air supply pipe extends into the filter tower below the filter screen, with an upward-facing air outlet branch pipe on the inserted part. The filter tower above the filter screen is equipped with an activated carbon packing layer; A steam pipe is connected to the side wall of the filter tower, and the output end of the steam pipe is connected to the side wall of the filter tower below the filter screen.

[0006] In a preferred embodiment, the dust filter chamber is equipped with a rotating frame with two mounting positions, each for installing a filter bag. A motor is located at the top of the dust filter chamber, and the motor drive shaft extends vertically downwards into the dust filter chamber and connects to the rotating frame.

[0007] In a preferred embodiment, the top surface of the dust filter chamber is provided with an inspection door, and the inspection door and the air inlet pipe are symmetrically arranged with the motor as the symmetrical point.

[0008] In a preferred embodiment, the air supply pipe is provided with a branch pipe, which is a backwash pipe, and an electrically controlled three-way valve is provided at the connection point between the backwash pipe and the air supply pipe.

[0009] In a preferred embodiment, the filter screen is multi-layered, and multiple output branches are provided on the steam pipeline, with each output branch corresponding to the other below the multi-layered filter screen.

[0010] In a preferred embodiment, the bottom of the filter tower is provided with a guide plate, the output end of the backwash pipe is located above the guide plate, and a drain pipe is provided on the side wall of the filter tower below the guide plate.

[0011] In a preferred embodiment, a sleeve is fitted onto the drain pipe; The steam pipeline includes a first steam pipe and a second steam pipe; The input end of the first steam pipe is connected to the steam generating equipment, and the output end is connected to the interface on the side wall of one end of the casing. The second steam pipe input end is connected to the interface on the side wall of the other end of the casing, and the output end is connected to multiple output branch pipes.

[0012] The purification device for exhaust gas from a yellow phosphorus electric furnace provided by this utility model, by adopting the above-described structure, has the following beneficial effects: (1) The exhaust gas is first filtered by the filter bag in the dust filter chamber to remove solid dust efficiently. Then, it is further filtered by the filter screen in the filter tower and adsorbed by the activated carbon packing layer. It can effectively remove impurities such as gaseous yellow phosphorus and fluoride. In particular, it can solve the problem of difficult removal of mist-like suspended matter formed by the condensation of gaseous yellow phosphorus, ensuring thorough purification of exhaust gas. (2) By using steam pipes to stably heat the drain pipe and filter screen, the low-temperature melting and liquefaction of the intercepted yellow phosphorus can be achieved, thus avoiding the clogging of the filter screen and pipes; (3) When the purified exhaust gas is used as a heating gas for food-grade phosphate, the impurities are fully removed, which can avoid appearance defects such as black spots in phosphate products, meet the quality standards of food-grade products, and enhance the market competitiveness of products. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] In the diagram: Dust filtration chamber 1, air inlet pipe 101, filter tower 2, exhaust pipe 201, air supply pipe 3, backwash pipe 4, filter bag 5, rotating frame 6, motor 7, inspection door 8, electrically controlled three-way valve 9, air outlet branch pipe 10, filter screen 11, activated carbon packing layer 12, guide plate 13, drain pipe 14, sleeve 15, first steam pipe 16, second steam pipe 17. Detailed Implementation

[0015] like Figure 1 In the present invention, a purification device for tail gas of yellow phosphorus electric furnace includes a dust filter chamber 1, wherein the top of the dust filter chamber 1 is provided with an air inlet pipe 101, the bottom of the dust filter chamber 1 is connected to the lower part of the filter tower 2 through an air supply pipe 3, and the top of the filter tower 2 is provided with an exhaust pipe 201. The dust filtration chamber 1 is equipped with a filter bag 5, which is located at the output end of the air inlet pipe 101. The filter tower 2 is equipped with a filter screen 11, and one end of the air supply pipe 3 extends into the filter tower 2 below the filter screen 11, and the part that penetrates is equipped with an upward-facing air outlet branch pipe 10. The filter tower 2 above the filter screen 11 is provided with an activated carbon packing layer 12; A steam pipe is connected to the side wall of the filter tower 2, and the output end of the steam pipe is connected to the side wall of the filter tower 2 below the filter screen 11.

[0016] In a preferred embodiment, the dust filter chamber 1 is provided with a rotating frame 6 inside, and the rotating frame 6 has two mounting positions, in which a filter bag 5 is installed respectively. The top of the dust filter chamber 1 is provided with a motor 7, and the drive shaft of the motor 7 extends vertically downward into the dust filter chamber 1 and is connected to the rotating frame 6.

[0017] In a preferred embodiment, the top surface of the dust filter chamber 1 is provided with an inspection door 8, and the inspection door 8 and the air inlet pipe 101 are symmetrically arranged with the motor 7 as the symmetrical point.

[0018] In a preferred embodiment, the air supply pipe 3 is provided with a branch pipe, which is a backwash pipe 4, and an electrically controlled three-way valve 9 is provided at the connection position between the backwash pipe 4 and the air supply pipe 3.

[0019] In a preferred embodiment, the filter 11 is multi-layered, and multiple output branches are provided on the steam pipeline, with each output branch corresponding to the other below the multi-layered filter.

[0020] In a preferred embodiment, the bottom of the filter tower 2 is provided with a flow guide plate 13, the output end of the backwash pipe 4 is located above the flow guide plate 13, and the side wall of the filter tower 2 below the flow guide plate 13 is provided with a drain pipe 14.

[0021] In a preferred embodiment, a sleeve 15 is fitted onto the drain pipe 14; The steam pipeline includes a first steam pipe 16 and a second steam pipe 17; The input end of the first steam pipe 16 is connected to the steam generating equipment, and the output end is connected to the interface on one side wall of the sleeve 15. The input end of the second steam pipe 17 is connected to the interface on the side wall of the other end of the sleeve 15, and the output end is connected to multiple output branch pipes.

[0022] The purification device for exhaust gas from a yellow phosphorus electric furnace disclosed in this utility model, during operation: The exhaust gas from the yellow phosphorus electric furnace enters the dust filter chamber 1 through the inlet pipe 101. The motor 7 drives the rotating frame 6 so that one of the filter bags 5 faces the inlet end. When the exhaust gas passes through the filter bag, more than 98% of the solid dust is intercepted (the dust concentration after filtration is ≤5mg / m³). When the filter bag resistance exceeds 1500Pa, the motor 7 drives the rotating frame to switch to another filter bag. At the same time, the dirty filter bag is replaced through the inspection door 8 to achieve continuous filtration.

[0023] After primary filtration, the exhaust gas enters the filter tower 2 through the air supply pipe 3, and is evenly dispersed upward through the air outlet branch pipe 10. It passes through multiple layers of filter screens 11 in sequence to further intercept residual dust and fine suspended matter. Subsequently, the exhaust gas enters the activated carbon packing layer 12, where the activated carbon adsorbs gaseous yellow phosphorus and fluorides. Finally, the purified exhaust gas is discharged from the exhaust pipe 201.

[0024] Every 8 hours of operation, close the air supply pipe 3 passage, open the electric three-way valve 9 to connect the compressed air to the backwash pipe 4, and backwash the filter screen 11 and activated carbon packing layer 12 for 10 minutes to remove attached impurities; at the same time, open the steam pipeline, and the steam is preheated through the sleeve 15 (to prevent the waste liquid in the drain pipe from freezing), and then sprayed to the bottom of the filter screen through the branch pipe of the second steam pipe 17. The high-temperature steam assists in cleaning the filter screen and promotes the desorption of residual yellow phosphorus. The rinsing waste liquid is collected along the guide plate 13 and discharged into the drain pipe 14 to ensure the long-term stable operation of the equipment.

Claims

1. A purification device for yellow phosphorus electric furnace tail gas, comprising a dust filtering bin (1), characterized in that: The dust filter chamber (1) is provided with an air inlet pipe (101) at the top, and the bottom of the dust filter chamber (1) is connected to the lower part of the filter tower (2) through an air supply pipe (3). The filter tower (2) is provided with an exhaust pipe (201) at the top. The dust filtration chamber (1) is equipped with a filter bag (5), which is located at the output end of the air inlet pipe (101); The filter tower (2) is equipped with a filter screen (11), and one end of the air supply pipe (3) extends into the filter tower (2) below the filter screen (11), and the part that penetrates is equipped with an upward-facing air outlet branch pipe (10). The filter tower (2) above the filter screen (11) is provided with an activated carbon packing layer (12). A steam pipe is connected to the side wall of the filter tower (2), and the output end of the steam pipe is connected to the side wall of the filter tower (2) below the filter screen (11).

2. A device for purifying tail gas of a yellow phosphorus electric furnace according to claim 1, characterized in that: The dust filter chamber (1) is equipped with a rotating frame (6) inside. The rotating frame (6) has two mounting positions, and a filter bag (5) is installed in each of the two mounting positions. The top of the dust filter chamber (1) is equipped with a motor (7). The drive shaft of the motor (7) goes vertically downward into the dust filter chamber (1) and is connected to the rotating frame (6).

3. A device for purifying tail gas from a yellow phosphorus electric furnace according to claim 2, characterized in that: The dust filter chamber (1) is provided with an inspection door (8) on the top surface. The inspection door (8) and the air inlet pipe (101) are symmetrically arranged with the motor (7) as the symmetrical point.

4. A device for purifying tail gas of a yellow phosphorus electric furnace according to claim 1, characterized in that: The air supply pipe (3) is provided with a branch pipe, which is a backwash pipe (4). An electrically controlled three-way valve (9) is provided at the connection position between the backwash pipe (4) and the air supply pipe (3).

5. A device for purifying tail gas of a yellow phosphorus electric furnace according to claim 1, characterized in that: The filter screen (11) is multi-layered, and multiple output branches are provided on the steam pipeline, with each output branch corresponding to the one below the multi-layered filter screen.

6. A device for purifying the off-gas of a yellow phosphorus electric furnace according to claim 5, characterized in that: The bottom of the filter tower (2) is provided with a guide plate (13), the output end of the backwash pipe (4) is located above the guide plate (13), and the side wall of the filter tower (2) below the guide plate (13) is provided with a drain pipe (14).

7. A device for purifying the off-gas of a yellow phosphorus electric furnace according to claim 6, characterized in that: A sleeve (15) is fitted onto the drain pipe (14); The steam pipeline includes a first steam pipe (16) and a second steam pipe (17); The input end of the first steam pipe (16) is connected to the steam generating equipment, and the output end is connected to the interface on one side wall of the sleeve (15); The input end of the second steam pipe (17) is connected to the interface on the side wall of the other end of the sleeve (15), and the output end is connected to multiple output branches.

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