Bromine flame retardant solvent tail gas recovery device

Abstract

The utility model discloses a kind of bromine flame retardant solvent tail gas recovery devices, comprising: tail gas collection tank, tail gas collection tank is connected with the gas collecting pipe with check valve, tail gas treatment tank, through liquid discharge pipe and tail gas collection tank intercommunication, solvent pump, solvent pump is set in tail gas treatment tank, the import and export of solvent pump are respectively fixedly connected with liquid inlet pipe and liquid outlet pipe, liquid outlet pipe is remote from the one end of solvent pump, passes through tail gas treatment tank and is connected with solvent treatment device, the top of tail gas collection tank and the top of tail gas treatment tank are also communicated by connecting pipe, the one end of connecting pipe located tail gas treatment tank passes through tail gas treatment tank and is connected with liquid pump.The utility model is advantageous in that: the circulation system of aqueous solution is constructed, liquid pump is transported to collection tank after the water after purification from treatment tank rear and is sprayed, the whole system does not need to stop, can realize the continuous treatment of tail gas and the continuous recovery of solvent;Multiple liquid seal, bromine flame retardant in tail gas is fully dissolved and absorbed.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, specifically to a device for recovering exhaust gas from bromine-based flame retardant solvents. Background Technology

[0002] The synthesis or post-processing of brominated flame retardants often involves the volatilization of large amounts of bromine-containing organic solvents, resulting in high-concentration, highly corrosive exhaust gases containing hydrogen bromide. These exhaust gases need to be recovered to prevent pollution of the surrounding environment and workers.

[0003] However, some problems exist with existing technologies and equipment: Traditional absorption devices typically employ a single spray method, resulting in limited contact area and short contact time between the exhaust gas and the absorbent liquid. This leads to insufficient dissolution and absorption of acidic gases such as hydrogen bromide in the exhaust gas, resulting in low purification efficiency and difficulty in meeting increasingly stringent environmental emission standards.

[0004] Traditional absorption processes often require intermittent operation or frequent shutdowns for wastewater discharge and absorbent replacement. This not only disrupts the production process and reduces efficiency, but also consumes large amounts of fresh water as the absorbent and generates large quantities of high-concentration wastewater, resulting in high subsequent treatment costs. This does not meet the demands of modern industrial green and continuous production.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the above-mentioned problems and provide a device for recovering tail gas of bromine-based flame retardant solvent.

[0007] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: a brominated flame retardant solvent tail gas recovery device, comprising: An exhaust gas collection box, wherein an exhaust gas collection pipe with a one-way valve is connected to the exhaust gas collection box; The exhaust gas treatment box is connected to the exhaust gas collection box via a drain pipe; A solvent pump is installed inside the exhaust gas treatment box. An inlet pipe and an outlet pipe are fixedly connected to the inlet and outlet of the solvent pump, respectively. The end of the outlet pipe away from the solvent pump passes through the exhaust gas treatment box and is connected to a solvent treatment device.

[0008] Preferably, the top of the exhaust gas collection box and the top of the exhaust gas treatment box are connected by a connecting pipe, the connecting pipe being located at one end of the exhaust gas treatment box, passing through the exhaust gas treatment box and connected to a liquid pump.

[0009] Preferably, a water tray with a leakage hole is fixedly connected to the upper part of the inner wall of the exhaust gas collection box.

[0010] Preferably, a plurality of baffles are fixedly connected to the bottom wall of the exhaust gas treatment box, and the heights of the baffles are different, increasing sequentially from the side away from the exhaust gas collection box to the side of the exhaust gas collection box.

[0011] Preferably, except for the baffle plate furthest from the exhaust gas collection box, each of the other baffle plates is provided with a liquid passage pipe; The liquid inlet pipe is equipped with a check valve, which only allows liquid to flow to the exhaust gas collection box.

[0012] The advantages of this utility model compared with the prior art are as follows: This device incorporates a perforated water tray within the exhaust gas collection chamber. Its simple overall structure allows for a large contact area and extended contact time between the bromine-containing exhaust gas and the sprayed water, enabling efficient dissolution and absorption of hydrogen bromide in the exhaust gas. Simultaneously, the exhaust gas treatment chamber employs a stepped, decreasing baffle plate structure, forming multiple liquid seals that effectively block gas escape paths. Furthermore, a solvent treatment device ensures that the purified gas meets emission standards, solving the problems of low purification efficiency and easy escape associated with traditional absorption methods.

[0013] In addition, a circulating system for the aqueous solution is constructed by operating a liquid pump. The liquid pump delivers the purified water from the rear of the treatment tank to the collection tank for spraying. The entire system can be operated continuously without shutdown, enabling continuous treatment of exhaust gas and continuous recovery of solvents. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a perspective view of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model.

[0017] As shown in the figure: 1. Exhaust gas collection box; 2. Gas collection pipe; 3. One-way valve; 4. Exhaust gas treatment box; 5. Drain pipe; 6. Solvent pump; 7. Liquid inlet pipe; 8. Liquid outlet pipe; 9. Connecting pipe; 10. Liquid pump; 11. Water pan; 12. Baffle plate; 13. Liquid passage pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Example 1: like Figures 1 to 2 As shown, this utility model provides a device for recovering tail gas from a brominated flame retardant solvent, including a tail gas collection box 1 and a tail gas treatment box 4. The tail gas collection box 1 is used to collect tail gas, and the tail gas treatment box 4 is used to treat the collected tail gas.

[0020] Among them, a partition plate is fixedly connected to the middle of the bottom wall of the exhaust gas collection box 1, and the partition plate has through holes.

[0021] Specifically, the exhaust gas collection box 1 is located in front of the exhaust gas treatment box 4. The lower part of the front end of the exhaust gas collection box 1 is connected to the gas collection pipe 2, and the exhaust gas enters the exhaust gas collection box 1 through the gas collection pipe 2. At the same time, a one-way valve 3 is fixedly connected to the end of the gas collection pipe 2 away from the exhaust gas collection box 1. Through the one-way valve 3, the exhaust gas can only flow in one direction to the exhaust gas collection box 1.

[0022] A drain pipe 5 is connected to the lower rear end of the exhaust gas collection box 1. The drain pipe 5 is L-shaped and is also connected to the upper front end of the exhaust gas treatment box 4. The end of the drain pipe 5 away from the exhaust gas treatment box 4 faces the bottom wall of the exhaust gas collection box 1. In this way, the treated exhaust gas will enter the exhaust gas treatment box 4 through the drain pipe 5.

[0023] Meanwhile, multiple baffle plates 12 are fixedly connected to the bottom wall of the exhaust gas treatment box 4. In this embodiment, there are three baffle plates 12, arranged longitudinally in a front-to-back manner; it should be noted that the heights of the three baffle plates 12 are different, decreasing sequentially from back to front. In addition, counting from front to back, the lower part of the first and second baffle plates 12 is connected to a liquid passage pipe 13, and the rear end of each liquid passage pipe 13 is fixedly connected to a check valve, which means that liquid is only allowed to flow from back to front.

[0024] Example 2: In the above embodiment one, the process of exhaust gas flowing from the exhaust gas collection box 1 to the exhaust gas treatment box 4 is described. In order to further explain the exhaust gas collection and flow circulation process, embodiment two is proposed.

[0025] First, a water pan 11 is fixedly connected to the upper part of the inner wall of the exhaust gas collection box 1, and several leakage holes are opened on the water pan 11.

[0026] Inside the exhaust gas treatment box 4, in front of the first baffle plate 12, is a solvent pump 6, which is a pneumatic double diaphragm pump. The solvent pump 6 is fixedly connected to the inner wall of the exhaust gas treatment box 4 via a connecting seat. An inlet pipe 7 and an outlet pipe 8 are fixedly connected to the inlet and outlet of the solvent pump 6, respectively. The end of the inlet pipe 7 away from the solvent pump 6 points towards the bottom wall of the exhaust gas treatment box 4. Meanwhile, the end of the outlet pipe 8 away from the solvent pump 6 passes through the top of the exhaust gas treatment box 4 and is fixedly connected to a solvent treatment device. In this embodiment, the solvent treatment device is a Hastelloy C276 thin-film evaporator. It should be noted that the Hastelloy C276 thin-film evaporator is only a preferred solvent treatment device; its specific function is to treat impurities in the processing solvent, and it can be selected according to actual needs. Furthermore, as an existing product, its specific principles and usage will not be elaborated further here.

[0027] Next, an inverted U-shaped connecting pipe 9 is installed, with its two ends connected to the exhaust gas collection box 1 and the exhaust gas treatment box 4, respectively. Additionally, one end of the connecting pipe 9 passes through the exhaust gas treatment box 4 and is connected to a liquid pump 10. The liquid pump 10 is a BQS50-40-145 model, waterproof, and is located behind the last baffle plate 12 from the front. The liquid pump 10 is also fixedly connected to the bottom wall of the exhaust gas treatment box 4.

[0028] In conjunction with Embodiments 1 and 2, in the specific use and implementation of this utility model, water is pre-filled in both the exhaust gas collection box 1 and the exhaust gas treatment box 4. Specifically, the water in the exhaust gas collection box 1 exceeds at least 2 / 3 of the height of the partition plates; the water in the exhaust gas treatment box 4 submerges the three partition plates 12.

[0029] Then, the liquid pump 10 starts, extracts water from the exhaust gas treatment box 4, and transports it to the exhaust gas collection box 1 through the connecting pipe 9. The water is then sprayed evenly downwards through the leak holes of the water pan 11 to form a water curtain.

[0030] Next, bromine-containing exhaust gas is supplied from the outside to the exhaust gas collection box 1 through the gas collection pipe 2. When the exhaust gas enters the exhaust gas collection box 1, it dissolves upon contact with the water and spray water curtain inside the exhaust gas collection box 1, generating a bromine-containing solution. The dissolved exhaust gas is collected in liquid form at the bottom of the exhaust gas collection box 1; the undissolved free exhaust gas is captured by the spray water curtain and falls into the water under the action of gravity.

[0031] The generated bromine-containing solution flows into the front area of ​​the exhaust gas treatment tank 4 through the L-shaped drain pipe 5. Inside the exhaust gas treatment tank 4, the solution is guided by the stepped liquid seal of the baffle plate 12, meaning that the liquid level successively overflows the baffle plate 12, which decreases in height from front to back.

[0032] Start the solvent pump 6 to draw the solution in front of the tail gas treatment box 4 through the inlet pipe 7, and deliver it to the solvent treatment device through the outlet pipe 8. The solvent treatment device is used to remove impurities and organic matter.

[0033] Then, the bromine-containing solution that has not passed the first barrier plate 12 will flow to the area formed by the first barrier plate 12 and the second barrier plate 12. The first barrier plate 12 is also equipped with a check valve to allow the bromine-containing solution to flow in front of the first barrier plate 12 and continue to be transported to the solvent treatment device through the solvent pump 6, the inlet pipe 7 and the outlet pipe 8, where the removal of impurities and organic matter is completed.

[0034] Similarly, the bromine-containing solution that has not passed the second barrier plate 12 will flow into the area formed by the second barrier plate 12 and the third barrier plate 12. The bromine-containing solution will pass through the check valve on the second barrier plate 12 and the check valve on the first barrier plate 12 in sequence, and enter the front of the first barrier plate 12. It will continue to be transported to the solvent treatment device through the solvent pump 6, the inlet pipe 7 and the outlet pipe 8, where impurities and organic matter are removed.

[0035] Then, as the amount of bromine-containing solution in the areas formed by the second and third barrier plates 12 gradually increases, it will eventually overflow the third barrier plate 12 and reach the rear of the third barrier plate 12.

[0036] In this way, the liquid pump 10 continuously delivers purified water from end 4 of the exhaust gas treatment box to the collection box for spraying, forming a water cycle. The exhaust gas is continuously input, dissolved, transferred, and treated, achieving continuous recovery.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

[0038] In addition, all electrical components mentioned in this article are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device such as a computer for control. The specific implementation of this disclosure omits detailed descriptions of known functions and known components. To ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments.

Claims

1. A bromine flame retardant solvent tail gas recovery apparatus characterized by comprising: The utility model relates to a tail gas collecting box (1) is connected with the gas collecting pipe (2) with one-way valve (3) on, tail gas treatment box (4) is communicated with tail gas collecting box (1) through drain pipe (5), solvent pump (6) is set up in tail gas treatment box (4), and the inlet and outlet of solvent pump (6) are fixedly connected with liquid inlet pipe (7) and liquid outlet pipe (8) respectively, the one end of liquid outlet pipe (8) away from solvent pump (6) passes through tail gas treatment box (4) and is connected with solvent treatment device. The top of tail gas collecting box (1) and the top of tail gas treatment box (4) are also communicated through connecting pipe (9), and the one end of connecting pipe (9) located in tail gas treatment box (4) passes through tail gas treatment box (4) and is connected with liquid pump (10). The inner wall upper portion of tail gas collecting box (1) is fixedly connected with water tray (11) with leakage hole. The bottom wall of tail gas treatment box (4) is fixedly connected with a plurality of blocking plates (12), the height of a plurality of blocking plates (12) is different, and from the side far away from tail gas collecting box (1) to the side of tail gas collecting box (1), the height is sequentially increased.

2. A bromine flame retardant solvent off-gas recovery device according to claim 1, characterized in that: Except for the blocking plate (12) farthest from tail gas collecting box (1), a liquid passage (13) is arranged on each of the remaining blocking plates (12).

3. A bromine flame retardant solvent exhaust gas recovery device according to claim 1, characterized by: A check valve is arranged on the liquid passage (13), and only liquid is allowed to flow to the side of tail gas collecting box (1).

4. A bromine flame retardant solvent exhaust gas recovery device according to claim 1, characterized by: ​ 5. A bromine flame retardant solvent off-gas recovery apparatus according to claim 4, characterized by: ​ ​

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