A system for recovering ammonium sulphate waste

Abstract

The utility model provides a kind of ammonium sulfate waste gas recovery system, including ammonium sulfate particle filtering device, waste gas inlet pipe is provided on it;Ammonium sulfate particle filtering device top is provided first gas phase outlet pipe, liquid distributor, absorption tower and benzene condenser are sequentially arranged along gas flow direction, the benzene solution is led out by the first liquid phase outlet pipe being arranged absorption tower bottom, the benzene condenser is provided outlet pipe and is connected with first liquid phase outlet pipe;The bottom of the ammonium sulfate particle filtering device is equipped with first solid phase outlet pipe, and the first solid phase outlet pipe is connected to ammonium sulfate recovery tank;The liquid distributor is provided second liquid phase outlet pipe and is connected with ammonium sulfate recovery tank, and the ammonium sulfate recovery tank is provided third liquid phase outlet pipe for output recovered ammonium sulfate solution.The utility model has the beneficial effect that: through the recycling of benzene, multi-stage concentration of ammonium sulfate solution reduces energy consumption and raw material cost, and the recovered ammonium sulfate can create economic benefits, while waste gas emission reduction reduces environmental protection compliance cost.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment, specifically to an ammonium sulfate waste gas recovery system. Background Technology

[0002] The waste gas from the mother liquor storage tank in the ammonium sulfate workshop has a complex composition and significant recovery value, but also poses environmental risks. This waste gas is mainly composed of nitrogen, but also contains ammonium sulfate particles at a concentration as high as 13% and volatile benzene at 1.6%. Currently, this waste gas is continuously vented into the atmosphere through a DN80 pipeline. This is not only an inefficient operation, but also results in a double waste of resources: on the one hand, a large amount of ammonium sulfate product is directly discharged into the atmosphere in particulate form, leading to considerable product loss; on the other hand, the highly valuable raw material benzene is also released.

[0003] Direct emissions of ammonium sulfate particles represent significant economic losses and product depletion. Ammonium sulfate is a core product in the plant's production, and as an important raw material for nitrogen-sulfur compound fertilizers, its direct emission is tantamount to letting qualified products dissipate into the atmosphere, severely reducing the actual yield and economic benefits of the plant. Recovering these particles directly increases product output and resource utilization. Benzene, as a highly volatile organic compound, poses a considerable hazard. It is classified as a highly polar hazardous medium, possessing high toxicity, carcinogenicity, and is flammable and explosive. Although the vent pipe is positioned at a high location for diffusion and dilution, under unfavorable weather conditions, benzene vapor may accumulate at ground level within the plant area. This exposes on-site operators and inspectors to significant occupational health and safety risks, potentially causing serious damage to the central nervous system and hematopoietic system through inhalation or skin contact.

[0004] From a resource recycling and process perspective, the current direct discharge model is extremely unreasonable. Benzene and ammonium sulfate in the waste gas both originate from upstream processes and are integral parts of this process flow. Efficient recovery of these components has dual significance: firstly, the captured ammonium sulfate solution can be directly returned to the workshop for recycling, a direct measure to improve product yield and achieve "product retention"; secondly, the recovered pure benzene vapor can be returned to the upstream system as a valuable raw material for reuse. Therefore, comprehensive treatment of this waste gas, achieving the synergistic recovery of benzene and ammonium sulfate, is not only a necessary requirement for eliminating safety hazards and fulfilling environmental responsibilities, but also a strategic choice to plug production loopholes, reduce costs and increase efficiency, and enhance the company's core competitiveness. Turning waste into treasure can achieve a win-win situation for both environmental and economic benefits. Utility Model Content

[0005] To overcome the above shortcomings and solve the problem of difficult recovery of ammonium sulfate waste gas.

[0006] This utility model provides an ammonium sulfate waste gas recovery system, including an ammonium sulfate particle filter device for filtering ammonium sulfate particles contained in the waste gas, and an waste gas inlet pipe is provided thereon. The ammonium sulfate particle filter is equipped with a first gas phase outlet pipe at the top, and a liquid distributor, an absorption tower and a benzene condenser are arranged in sequence along the gas flow direction. The absorption tower is equipped with a first liquid phase outlet pipe at the bottom to discharge benzene solution, and the benzene condenser is equipped with an outlet pipe connected to the first liquid phase outlet pipe. The ammonium sulfate particle filtration device is equipped with a first solid phase outlet pipe at the bottom for discharging the intercepted ammonium sulfate particles. The first solid phase outlet pipe is connected to the ammonium sulfate recovery tank. The liquid distributor is equipped with a second liquid phase outlet pipe connected to the ammonium sulfate recovery tank. The ammonium sulfate recovery tank is equipped with a third liquid phase outlet pipe for outputting the recovered ammonium sulfate solution.

[0007] As a preferred embodiment, the top of the ammonium sulfate recovery tank is also provided with a second gas phase outlet pipe, which is connected to the liquid distributor to realize the recirculation treatment of uncondensed gas.

[0008] As a preferred embodiment, the ammonium sulfate recovery tank includes an ammonium sulfate recovery tank 1 and an ammonium sulfate recovery tank 2 arranged in series, for multi-stage recovery and concentration of ammonium sulfate solution.

[0009] As a preferred embodiment, the absorption tower includes an absorption tower 1 and an absorption tower 2 arranged in parallel, which can be operated alternately or simultaneously to enhance the flexibility and processing capacity of the system operation.

[0010] As a preferred embodiment, the exhaust gas inlet pipe of the ammonium sulfate particle filter is also connected to an exhaust gas buffer tank to stabilize the exhaust gas flow; an exhaust gas fan is installed on the connecting pipe between the exhaust gas buffer tank and the ammonium sulfate particle filter to provide power for exhaust gas transport.

[0011] As a preferred embodiment, the ammonium sulfate particle filtration device is equipped with a particle recovery baffle to enhance the collection and recovery of ammonium sulfate particles.

[0012] The beneficial effects of this utility model are as follows: 1. The present invention uses an ammonium sulfate particle filter to directly intercept solid ammonium sulfate particles in the waste gas at the front end, preventing the particles from escaping with the airflow. The intercepted particles enter the ammonium sulfate recovery tank through the first solid phase outlet pipe to achieve direct recovery of solid ammonium sulfate. Subsequently, the ammonium sulfate dissolved or entrained in the waste gas is captured in the form of benzene solution through a liquid distributor, an absorption tower and a benzene condenser. The solution is then introduced into the ammonium sulfate recovery tank through the first liquid phase outlet pipe. The second liquid phase outlet pipe of the liquid distributor further returns the ammonium sulfate solution that has not been completely absorbed to the recovery tank, forming a closed loop of full-form recovery of "particles + solution".

[0013] 2. This invention reduces energy consumption and raw material costs through the recycling of benzene and multi-stage concentration of ammonium sulfate solution. The parallel absorption tower allows for non-stop maintenance, avoiding production interruptions and losses. The recovered ammonium sulfate generates economic benefits, while achieving emission standards for waste gas reduces environmental compliance costs. Overall, this system integrates four major objectives: resource recovery, environmental governance, stable operation, and economic efficiency. It is suitable for industrial scenarios such as chemical and pharmaceutical industries that generate ammonium sulfate waste gas, possessing the dual advantages of environmental compliance and economic feasibility. Attached Figure Description

[0014] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein... Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] The numbers in the attached diagram are: 1. Waste gas buffer tank; 2. Waste gas fan; 3. Ammonium sulfate particle filter; 31. First gas phase outlet pipe; 32. First solid phase outlet pipe; 5. Liquid distributor; 6. Absorption tower; 61. First liquid phase outlet pipe; 7. Benzene condenser; 8. Ammonium sulfate recovery tank; 9. Ammonium sulfate recovery tank; 91. Third liquid phase outlet pipe; 92. Second gas phase outlet pipe; 10. Second liquid phase outlet pipe. Detailed Implementation

[0016] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0017] Example: Please see Figure 1 This utility model provides an ammonium sulfate waste gas recovery system, including a waste gas buffer tank 1 with an inlet connected to an upstream waste gas source and a volume of 5 m³, used to stabilize the waste gas flow. The outlet of the waste gas buffer tank 1 is connected to a waste gas fan 2 (power 7.5 kW, air volume 3000 m³ / h) via a pipeline, providing power for the system to transport waste gas.

[0018] The outlet of exhaust fan 2 is connected to ammonium sulfate particle filter device 3. This device is equipped with a particle recovery baffle to effectively enhance the collection efficiency of ammonium sulfate particles. A first solid phase outlet pipe 32 is located at the bottom of the device, connected to the ammonium sulfate recovery tank 9, for discharging the trapped ammonium sulfate particles. A first gas phase outlet pipe 31 with a diameter of 200 mm is located at the top of the device.

[0019] Along the gas flow direction, the first gas phase outlet pipe 31 is sequentially connected to the liquid distributor 5, the absorption tower 6, and the benzene condenser 7. The absorption tower 6 consists of two parallel absorption towers (each with a diameter of 1.2m and a packing height of 3m), which can operate alternately or simultaneously, with a processing capacity of 3000 m³ / h. The bottom of the absorption tower 6 has a first liquid phase outlet pipe 61 to discharge the benzene solution. The benzene condenser 7 uses a shell-and-tube heat exchanger with a heat exchange area of ​​50 m², cooling the temperature to 5°C; its outlet pipe is connected to the first liquid phase outlet pipe 61.

[0020] The distributor 5 is equipped with a second liquid phase outlet pipe 10 connected to the ammonium sulfate recovery tank 9. The ammonium sulfate recovery tank 9 includes two ammonium sulfate recovery tanks (each with a volume of 3 m³) connected in series, for multi-stage recovery and concentration of the ammonium sulfate solution. A second gas phase outlet pipe 92 is installed at the top of the recovery tank, connected to the distributor 5, to achieve recirculation of uncondensed gas. A third liquid phase outlet pipe 91 is installed at the bottom of the recovery tank for outputting a recovered ammonium sulfate solution with a concentration of up to 20%.

[0021] This system achieves efficient capture of ammonium sulfate particles, effective recovery of benzene vapor, and concentrated collection of ammonium sulfate solution through the orderly combination of multi-stage processing units, with an overall recovery rate exceeding 95%. The coordinated operation of each unit ensures the continuity and stability of the system, while the parallel absorption tower design facilitates system maintenance.

[0022] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A system for recovering ammonium sulfate waste gas, characterized in that: Includes ammonium sulfate particle filter device (3), used to filter ammonium sulfate particles contained in waste gas, and equipped with a waste gas inlet pipe; The ammonium sulfate particle filter device (3) is provided with a first gas phase outlet pipe (31) at the top, and a liquid distributor (5), an absorption tower (6) and a benzene condenser (7) are arranged in sequence along the gas flow direction. The absorption tower (6) is provided with a first liquid phase outlet pipe (61) at the bottom to discharge benzene solution. The benzene condenser (7) is provided with an outlet pipe connected to the first liquid phase outlet pipe (61). The ammonium sulfate particle filter device (3) is provided with a first solid phase outlet pipe (32) at the bottom for discharging the intercepted ammonium sulfate particles. The first solid phase outlet pipe (32) is connected to the ammonium sulfate recovery tank (9). The liquid distributor (5) is provided with a second liquid phase outlet pipe (10) connected to the ammonium sulfate recovery tank (9). The ammonium sulfate recovery tank (9) is provided with a third liquid phase outlet pipe (91) for outputting the recovered ammonium sulfate solution.

2. The ammonium sulfate waste gas recovery system according to claim 1, characterized in that: The top of the ammonium sulfate recovery tank (9) is also provided with a second gas phase outlet pipe (92), which is connected to the liquid distributor (5) to realize the recirculation treatment of uncondensed gas.

3. The ammonium sulfate waste gas recovery system according to claim 1, characterized in that: The ammonium sulfate recovery tank (9) includes an ammonium sulfate recovery tank 1 and an ammonium sulfate recovery tank 2 arranged in series, which are used for multi-stage recovery and concentration of ammonium sulfate solution.

4. The ammonium sulfate waste gas recovery system according to claim 1, characterized in that: The absorption tower (6) includes an absorption tower 1 and an absorption tower 2 arranged in parallel, which can be operated alternately or simultaneously to enhance the flexibility and processing capacity of the system operation.

5. The ammonium sulfate waste gas recovery system according to claim 2, characterized in that: The exhaust gas inlet pipe of the ammonium sulfate particle filter device (3) is also connected to an exhaust gas buffer tank (1) to stabilize the exhaust gas flow; an exhaust gas fan (2) is installed on the connecting pipe between the exhaust gas buffer tank (1) and the ammonium sulfate particle filter device (3) to provide exhaust gas transport power.

6. The ammonium sulfate waste gas recovery system according to claim 1, characterized in that: The ammonium sulfate particle filtration device (3) is equipped with a particle recovery baffle to enhance the collection and recovery of ammonium sulfate particles.

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