Hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production

Abstract

The utility model discloses hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production, which comprises a discharge pipeline and a recovery device, one end of the discharge pipeline is communicated and connected with a section of sunken structure of an air duct in a seawater bromine extraction system, the recovery device comprises a filter tank, the other end of the discharge pipeline is communicated and connected with the filter tank, and the filter tank is communicated with the discharge pipeline. An overflow pipe is arranged on the outer wall of one side of the top end of the filtering tank in a communicating mode, one end of the overflow pipe is connected with a collecting pool in a communicating mode, and the collecting pool is connected with the absorption tower in a communicating mode through a backflow device. Therefore, corrosion of hydrobromic acid to equipment such as a fan is effectively prevented, the service life of the equipment is prolonged, the maintenance frequency and cost of the equipment are reduced, meanwhile, secondary absorption treatment of hydrobromic acid waste liquid is achieved, the bromine element recovery rate is increased, and the utilization efficiency of resources is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of seawater bromine extraction, and particularly relates to a hydrogen bromide waste liquid recovery equipment in seawater bromine extraction production. BACKGROUND

[0002] Bromine is a kind of red-brown liquid, molecular formula Br2, relative density 3.119 (20 DEG C), boiling point 58.78 DEG C, volatile, with strong corrosive, slightly soluble in water, easily soluble in ethanol, diethyl ether, chloroform, carbon tetrachloride, kerosene and carbon disulfide and a variety of organic solvents, also soluble in hydrochloric acid, hydrogen bromide and bromide compound solution.Bromine is an important chemical raw material, has wide application in flame retardant, extinguishing agent, refrigerant, photosensitive material, medicine, pesticide, oil field and other industries.The existing air blowing method is the commonly used method for industrial scale seawater bromine extraction.

[0003] Air blowing method process is in the concentrated seawater that is acidified in advance, with chlorine gas replacement bromide ion to become elemental bromine, then air and water vapor are passed into, bromine is blown into absorption tower, bromine vapor and absorbent sulfur dioxide react to convert into hydrogen bromide to achieve the purpose of enrichment.Then, through the distillation tower, chlorine gas is used to oxidize to obtain industrial bromine.

[0004] The raw halogen mixed with concentrated brine and seawater is pumped into the blowing tower by double suction pump, is acidified by dilute sulfuric acid in the pipeline, and the pH value is adjusted to the process requirement, then chlorine gas is passed in to oxidize bromide ion into free bromine molecule.The halogen water after acidification and oxidation enters the top of the blowing tower, flows from top to bottom and countercurrently contacts with the air blown by the air blower in the tower, and the main reaction is closed circulation.Free bromine in the raw halogen diffuses into the air.Under the driving of the air blower, free bromine and water vapor react with SO2 in the air duct to obtain misty hydrogen bromide, and then the completed liquid is obtained by enrichment through the mist catcher.The completed liquid is pumped into the distillation tower through the pipeline at the bottom of the absorption tower and enters the absorption liquid circulating tank when the liquid level reaches a certain height.The completed liquid overflows into the completed liquid pool through the pipeline when the liquid level reaches a certain height.The completed liquid is preheated and pumped into the distillation tower, and chlorine gas is passed in to oxidize the bromide ion in the completed liquid into free bromine.The post-steam liquid is discharged from the bottom of the tower to the dilute acid pool.Gaseous bromine is distilled from the top of the tower, and the finished product bromine is obtained after condensation and separation.

[0005] The raw halogen water after acidification and oxidation countercurrently contacts with air in the blowing tower, free bromine formed is converted into hydrogen bromide by reacting with SO2 and water in the absorption tower, and the completed liquid is formed by enrichment for use in the distillation process.The air is closed circulation, and part of hydrogen bromide is entrained when the air passes through the absorption tower and the mist catcher, which corrodes the air blower and causes waste of product.

[0006] How to invent a hydrogen bromide waste liquid recovery equipment in seawater bromine extraction production to improve these problems has become a problem to be solved by the person skilled in the art. UTILITY MODEL CONTENT

[0007] In order to make up for the above shortcomings, the utility model provides a kind of hydrogen bromide waste liquid recovery equipment in seawater bromine production, to improve the existing air blow method is used to carry out seawater bromine production, airflow passes through absorption tower and defoaming tower, part of hydrogen bromide formed in production process is entrained, causing corrosion fan and causing product waste problem.

[0008] The utility model is such a realization: a kind of hydrogen bromide waste liquid recovery equipment in seawater bromine production, including drainage pipeline and recovery device, the drainage pipeline one end is connected with the communication connection of the section of the air duct of seawater bromine system in sinking type structure, the recovery device includes filter tank, the other end of the drainage pipeline is connected with filter tank, overflow pipe is communicated and set in the top side outer wall of filter tank, one end of overflow pipe is connected with the communication connection of collection pool, collection pool is connected with the communication connection of absorption tower by reflux device.

[0009] In a preferred technical scheme in the utility model, the reflux device is self-suction tank and recovery pump, the collection pool is connected with the liquid inlet of self-suction tank by reflux pipeline, the liquid outlet of self-suction tank is connected with the liquid pumping end of recovery pump, and the liquid sending end of recovery pump is connected with absorption tower.

[0010] In a preferred technical scheme in the utility model, liquid level sensing device is arranged in the collection pool, and the liquid level sensing device is electrically connected with recovery pump.

[0011] In a preferred technical scheme in the utility model, water injection valve is arranged on the collection pool.

[0012] In a preferred technical scheme in the utility model, the filter tank is bag type filter tank or filter core type filter tank.

[0013] In a preferred technical scheme in the utility model, the self-suction tank is water ring type self-suction tank or jet type self-suction tank.

[0014] The utility model has the advantages that: the hydrogen bromide waste liquid recovery equipment in seawater bromine production is obtained by the above design, when using, the hydrogen bromide waste liquid recovery equipment in seawater bromine production is discharged by drainage pipeline The hydrogen bromide waste liquid entrained in air duct is discharged, to avoid its continuous flow in air duct, so that the corrosion of hydrogen bromide to fan and other equipment is effectively prevented.The service life of equipment is prolonged, the maintenance frequency and cost of equipment are reduced, and secondary absorption treatment of hydrogen bromide waste liquid is realized, the recycling mode can improve the recovery rate of bromine element, and the utilization efficiency of resources is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. Other related drawings can also be obtained by those skilled in the art without creative labor on the premise of not deviating from the concept of the present application.

[0016] Fig. 1 is a schematic perspective view of the overall structure provided by the embodiments of the present application;

[0017] Fig. 2 is another schematic perspective view of the overall structure provided by the embodiments of the present application;

[0018] Fig. 3 is a schematic perspective view of the overall structure of the collection tank provided by the embodiments of the present application;

[0019] Fig. 4 is a schematic block diagram of the connection of the overall structure with the existing extraction system provided by the embodiments of the present application.

[0020] In the figure: 1, drain pipe; 2, recovery device; 3, air duct; 4, absorption tower; 201, filter tank; 202, collection tank; 203, self-suction tank; 204, recovery pump; 205, liquid level sensing device. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Please refer to Figs. 1 to 4 The present application provides a technical scheme: a hydrogen bromide waste liquid recovery equipment in seawater bromine extraction production, including drain pipe 1 and recovery device 2, one end of drain pipe 1 is communicated and connected with one section of the sunken structure of air duct 3 in seawater bromine extraction system, recovery device 2 includes filter tank 201, the other end of drain pipe 1 is communicated and connected with filter tank 201, overflow pipe is arranged on the outer wall of the top side of filter tank 201, one end of overflow pipe is communicated and connected with collection tank 202, collection tank 202 is communicated and connected with absorption tower 4 through reflux device.

[0023] Further, the backflow device is a self-suction tank 203 and a recovery pump 204. The collection tank 202 is connected to the liquid inlet of the self-suction tank 203 through a backflow pipeline, the liquid outlet of the self-suction tank 203 is connected to the liquid suction end of the recovery pump 204, and the liquid delivery end of the recovery pump 204 is connected to the absorption tower 4.

[0024] The self-suction tank 203 and the recovery pump 204 play a key role in the entire recovery system, which is to transfer the hydrobromic acid waste liquid from the collection tank 202 to the absorption tower 4. The self-suction tank 203 can generate negative pressure through its self-suction function when starting, and can suck the hydrobromic acid waste liquid in the collection tank 202, which solves the problem that the conventional pump cannot work normally due to low liquid level, and provides a stable liquid source for the subsequent recovery pump 204. The recovery pump 204 can increase the pressure of the sucked hydrobromic acid waste liquid, overcome the pipeline resistance and the liquid inlet pressure of the absorption tower 4, and ensure that the waste liquid can smoothly enter the absorption tower for secondary absorption treatment, so as to realize the recovery and utilization of the hydrobromic acid waste liquid. In this way, the bromine element in the waste liquid can be introduced into the absorption tower for further reaction or separation, the overall recovery rate of the bromine element is improved, the resource waste is reduced, and the economic benefit of the seawater bromine extraction production process is improved.

[0025] Further, the collection tank 202 is provided with a liquid level sensing device 205, and the liquid level sensing device 205 is electrically connected with the recovery pump 204.

[0026] The liquid level sensing device 205 can be a liquid level sensor or a rod type floating ball liquid level meter. The liquid level sensing device 205 is mainly used for accurately monitoring the liquid level of the hydrobromic acid waste liquid in the collection tank 202, and realizing automatic control through electrical connection with the recovery pump 204. When the liquid level in the collection tank 202 reaches the set upper limit, the liquid level sensing device 205 sends a start signal to the recovery pump 204, so that the recovery pump 204 starts to work and transports the waste liquid to the absorption tower 4; when the liquid level drops to the set lower limit, the liquid level sensing device sends a stop signal to the recovery pump, so as to avoid the recovery pump running empty or running at low liquid level, prevent equipment damage caused by running empty, and save energy. The accurate control of the liquid level sensing device can also ensure the stability of the liquid level in the collection tank, avoid overflow caused by too high liquid level, and avoid affecting the normal work of the self-suction tank 203 caused by too low liquid level.

[0027] Further, the collection tank 202 is provided with a water injection valve.

[0028] The water injection valve is arranged on the collection tank 202, and its main function is to dilute and clean the hydrobromic acid waste liquid in the collection tank. When the concentration of the hydrobromic acid waste liquid is too high, the corrosiveness of the waste liquid can be reduced by injecting water or other diluents, preventing serious corrosion of the equipment and pipelines, and adjusting the physicochemical properties of the waste liquid to make it easier to handle subsequently. When the collection tank 202 is cleaned, the water injection valve can be used to introduce a large amount of clean water to flush out the sediment and impurities in the tank, ensuring the cleanliness of the collection tank and preparing for the next waste liquid collection.

[0029] Further, the filter tank 201 is a bag filter tank or a filter cartridge filter tank.

[0030] The bag filter tank selects a suitable filter bag according to the characteristics and impurity content of the hydrobromic acid waste liquid. For example, if the waste liquid mainly contains impurity particles with a particle size of 100-200 microns, a nylon filter bag can be selected, which has high strength and good acid and alkali resistance. During use, the differential pressure of the filter bag is monitored regularly. When the pressure difference before and after the filter bag exceeds the set value (such as 0.05 MPa), it indicates that the filter bag may be clogged and needs to be replaced.

[0031] The filter cartridge filter tank selects different types of filter cartridges according to the required filtration accuracy. For example, if 0.5-5 micron impurities need to be filtered, a sintered filter cartridge can be selected, which has good chemical stability and filtration accuracy. The filter cartridge must be installed vertically to prevent uneven filtration due to tilting. During operation, the pressure difference between the inlet and outlet of the filter tank is monitored. When the pressure difference exceeds a certain range (such as 0.1 MPa), the filter cartridge needs to be replaced. In addition, according to the flow rate of the hydrobromic acid waste liquid and the filtration requirements, the number of filter cartridges can be adjusted. For example, a multi-core filter cartridge filter tank can be used to increase the filtration area and improve the filtration efficiency.

[0032] The selection can be flexible according to the impurity characteristics of the hydrobromic acid waste liquid, the treatment capacity, the requirements for the purity of the recovered liquid, and the cost budget. Whether a low-cost bag filter tank or a high-filtration-precision filter cartridge filter tank is selected, it can ensure effective filtration of the hydrobromic acid waste liquid, remove impurities, and provide purer hydrobromic acid waste liquid for subsequent recovery and treatment, thereby improving the adaptability and processing capacity of the entire recovery device and meeting different production requirements.

[0033] Further, the self-suction tank 203 is a water ring self-suction tank or a jet type self-suction tank.

[0034] The water ring self-suction tank needs to check the water ring forming components before starting to ensure the conditions required for the formation and maintenance of the water ring. For example, ensure the cleanliness of the water in the tank during use to prevent impurities from entering and affecting the performance of the water ring vacuum pump. According to the flow rate of the hydrobromic acid waste liquid and the liquid level of the collection tank 202, adjust the speed of the impeller and the working parameters of the water ring reasonably to ensure sufficient self-suction capacity. At the same time, regularly check and maintain the impeller, shaft seal and other components of the water ring self-suction tank to prevent wear and leakage.

[0035] The jet self-suction tank determines the appropriate jet angle and jet flow rate through experiments and calculations according to the pressure and flow rate of the high-pressure fluid (such as compressed air or high-pressure water) provided on site to ensure that sufficient negative pressure is generated to suck in the hydrobromic acid waste liquid. The design of the jet port and suction port of the jet self-suction tank needs to be reasonable to ensure that the energy of the jet flow is converted into effective negative pressure energy. At the same time, regular checks need to be made on the jet components, such as checking whether the nozzle is blocked or worn, to ensure the reliability of the jet device.

[0036] According to different site conditions and use requirements, the most suitable type of self-suction tank 203 can be selected. The water ring self-suction tank can work stably in complex environments, ensuring effective self-suction of the hydrobromic acid waste liquid and ensuring the stability and reliability of the entire recovery system; the jet self-suction tank reduces the maintenance cost and complexity of the equipment, improves the operating efficiency and maintainability of the equipment, provides a guarantee for the long-term stable operation of the hydrobromic acid waste liquid recovery equipment in the entire seawater bromine extraction production, meets the needs of different users and different production environments, and improves the adaptability and economy of the system.

[0037] Working principle: During the seawater bromine extraction production process, the circulating air flow formed by the fan flows through the air duct 3 between the absorption tower 4, the foam catcher and the blowing tower, and the hydrogen bromide residual liquid entrained in the air flow will be affected by gravity and enter the recovery device 2 through the drainage pipe 1 at the lower section of the air duct 3. The filter tank 201 (which can be bag type or filter element type) filters the waste liquid, large particles are intercepted, and when the liquid level is too high, it enters the collection tank 202 through the overflow pipe. The liquid level sensing device 205 monitors the liquid level and controls the recovery pump 204. The self-suction tank 203 (water ring type or jet type) sucks the waste liquid into the recovery pump 204, which pressurizes and transports it to the absorption tower 4 for secondary absorption, achieving the collection, filtration, storage, transportation and recycling of the hydrobromic acid waste liquid, reducing corrosion and improving resource recovery rate, and ensuring stable and efficient operation of the system.

[0038] It should be noted that the specific model and specifications of the filter tank 201, self-suction tank 203, recovery pump 204 and liquid level sensing device 205 need to be determined according to the actual specifications of the device. The specific selection and calculation method uses existing technology in the art, so it will not be described in detail.

[0039] The power supply of the filter tank 201, the self-priming tank 203, the recovery pump 204 and the liquid level sensing device 205 and its principle are clear to those skilled in the art, and will not be described in detail here.

[0040] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for recovering hydrobromic acid waste liquid in seawater bromine extraction production, characterized in that, The system includes a discharge pipe and a recovery device. One end of the discharge pipe is connected to a submerged section of the air duct in the seawater bromine extraction system. The recovery device includes a filter tank. The other end of the discharge pipe is connected to the filter tank. An overflow pipe is installed on one side of the outer wall of the top of the filter tank. One end of the overflow pipe is connected to a collection tank. The collection tank and the absorption tower are connected through a reflux device.

2. The hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production as described in claim 1, characterized in that: The reflux device consists of a self-priming tank and a recovery pump. The collection pool is connected to the inlet of the self-priming tank via a reflux pipe. The outlet of the self-priming tank is connected to the pumping end of the recovery pump. The delivery end of the recovery pump is connected to the absorption tower.

3. The hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production as described in claim 1, characterized in that: The collection tank is equipped with a liquid level sensor, which is electrically connected to the recovery pump.

4. The hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production as described in claim 1, characterized in that: The collection pool is equipped with a water injection valve.

5. The hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production as described in claim 1, characterized in that: The filter canister is a bag filter canister or a cartridge filter canister.

6. The hydrobromic acid waste liquid recovery equipment in seawater bromine extraction production as described in claim 2, characterized in that: The self-priming tank is either a water ring type or a jet type.

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