Tail gas treatment equipment

Abstract

The utility model discloses tail gas treatment equipment which comprises a fan, a first spray tower, a second spray tower and a third spray tower which are sequentially connected through an exhaust pipeline, the first spray tower is provided with a water circulation spray pipeline, the second spray tower is provided with an alkali liquor circulation spray pipeline, and the third spray tower is provided with a reducing agent solution circulation spray pipeline. Through staged treatment of the three spray towers, harmful components in waste gas are efficiently removed, the concentration of waste acid gas and nitric oxide is remarkably reduced, almost zero emission is achieved, and the environmental protection standard is met; due to the cooling function of the first spray tower, the energy utilization efficiency is optimized, and the energy consumption is reduced; the automatic control technology adopted by the system ensures the dynamic adjustment of the spraying liquid, and enhances the reliability and flexibility of the treatment process; meanwhile, due to the multi-level treatment capacity, various waste gas treatment requirements can be met, so that the emission cost and the environment-friendly rectification cost of an enterprise are reduced in long-term operation, and the economic benefit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment equipment technical field, concretely relates to a tail gas treatment equipment. BACKGROUND

[0002] Chinese patent (application number: 202322496107.7, application date: 2023.09.14) discloses a pickling waste acid disposal system, which mixes and reacts ferrous sulfate, ferrous chloride, iron filings, waste acid, oxygen and polymeric stabilizer into a reaction kettle to prepare a flocculating agent, so that the pickling waste acid is treated.

[0003] The pickling waste acid disposal system produces waste gas such as waste acid gas and nitrogen oxides, so effective waste gas treatment measures such as gas capture and purification system need to be designed in the process to ensure compliance with environmental protection requirements. Common waste gas treatment methods include absorption method, catalysis method and high-temperature incineration, etc. Although these methods can effectively remove harmful components in waste gas in some cases, they often have problems such as high energy consumption, high investment cost, secondary pollution and low treatment efficiency, which cannot meet the requirements of modern environmental protection policy and zero emission. UTILITY MODEL CONTENT

[0004] In order to treat the waste gas produced by the pickling waste acid disposal system in multiple levels and stages to achieve almost zero emission effect, the utility model provides a tail gas treatment equipment.

[0005] The technical scheme adopted by the utility model is as follows: a tail gas treatment equipment, comprising a fan, a first spray tower, a second spray tower and a third spray tower connected by exhaust pipes in sequence, the first spray tower is provided with a water circulation spray pipeline, the second spray tower is provided with an alkali liquor circulation spray pipeline, and the third spray tower is provided with a reducing agent solution circulation spray pipeline.

[0006] Preferably, the first spray tower is provided with a water supplement pipeline, and the control valve of the water supplement pipeline takes the temperature sensor of the bottom liquid bin of the first spray tower as the opening and closing signal source.

[0007] Preferably, the water supplement pipeline is connected with a cold water tower.

[0008] Preferably, the second spray tower is provided with an alkali liquor tank and an alkali supplement pipeline, and the control valve of the alkali supplement pipeline takes the pH sensor of the bottom liquid bin of the second spray tower as the opening and closing signal source.

[0009] Preferably, the third spray tower is provided with a reducing agent solution tank and a reducing agent supplement pipeline, and the control valve of the reducing agent supplement pipeline takes the NOx online sensor at the exhaust port of the third spray tower as the opening and closing signal source.

[0010] Preferably, the recovered liquid of the first spray tower, the second spray tower and the third spray tower is returned to the waste acid treatment device for recycling.

[0011] The utility model has the following beneficial effects:

[0012] 1. Efficiently remove waste gas components: by setting three spray towers, respectively for cooling, neutralization and reduction treatment, can effectively remove a variety of harmful components in waste gas, so as to significantly reduce the concentration of waste acid gas and nitrogen oxides in waste gas;

[0013] 2. Achieve almost zero emission: through the comprehensive treatment process, the emission of waste gas after waste acid treatment can be effectively controlled and reduced, the harmful gas released to the environment is close to zero emission, meeting modern environmental protection regulations and standards;

[0014] 3. Energy saving: in the first spray tower, the temperature of the inlet waste gas is reduced by cooling, providing better reaction conditions for subsequent treatment process, thereby optimizing energy utilization efficiency and reducing energy consumption in the treatment process;

[0015] 4. Flexible adjustment and automatic control: using pH value monitoring, monitoring nitrogen oxide concentration, feedback control and other automatic technologies, dynamic control of spray liquid is realized, which not only improves the operation efficiency of the system, but also enhances the reliability and safety of the treatment process;

[0016] 5. Multi-level treatment capacity: the three-stage treatment structure design makes the equipment have higher flexibility and efficiency when treating complex waste gas, and can accurately treat different types of pollutants to meet various waste gas treatment needs;

[0017] 6. Economic benefits: through efficient waste gas treatment and energy saving effect, the enterprise can reduce emission cost and environmental improvement cost in long-term operation, and improve overall economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the pipeline principle schematic diagram of the utility model embodiment.

[0019] The first spray tower 1, the second spray tower 2, the third spray tower 3, the exhaust duct 4, the fan 5, the water circulation spray pipeline 6, the lye circulation spray pipeline 7, the reducing agent solution circulation spray pipeline 8, the water supplement pipeline 9, the lye tank 10, the lye supplement pipeline 11, the reducing agent solution tank 12 and the reducing agent supplement pipeline 13. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with embodiments and drawings.

[0021] In the embodiment, as Figure 1As shown, it is a tail gas treatment equipment for treating the waste gas of the pickling waste acid treatment system proposed in the patent document (application number: 202322496107.7, application date: 2023.09.14). It includes a fan 5, a first spray tower 1, a second spray tower 2 and a third spray tower 3 connected in turn by an exhaust pipe 4. The first spray tower 1 is provided with a water circulation spray pipeline 6, the second spray tower 2 is provided with an alkali solution circulation spray pipeline 7, and the third spray tower 3 is provided with a reducing agent solution circulation spray pipeline 8. Among them, the first spray tower 1, the second spray tower 2 and the third spray tower 3 all include a tower body, the bottom of the tower body is a liquid bin, the side wall is provided with an air inlet, the top is provided with an air outlet, and a liquid separator is arranged at the top in the tower body. At least two layers of spray assemblies are arranged in the tower body in the vertical direction, and a filler bed is arranged below each group of spray assemblies. The air inlet of the first spray tower 1 is connected with the fan 5, the air outlet of the first spray tower 1 is connected with the air inlet of the second spray tower 2, the air outlet of the second spray tower 2 is connected with the air inlet of the third spray tower 3, and the air outlet of the third spray tower 3 is discharged. The inlet and outlet of the circulating pump in the water circulation spray pipeline 6 are respectively connected with the liquid bin and the spray assembly of the first spray tower 1, the inlet and outlet of the circulating pump in the alkali solution circulation spray pipeline 7 are respectively connected with the liquid bin and the spray assembly of the second spray tower 2, and the inlet and outlet of the circulating pump in the reducing agent solution circulation spray pipeline 8 are respectively connected with the liquid bin and the spray assembly of the third spray tower 3. By arranging three spray towers, cooling, neutralization and reduction treatment can be carried out respectively, which can effectively remove various harmful components in the waste gas, thereby significantly reducing the concentration of waste acid gas and nitrogen oxides in the waste gas. Through the comprehensive treatment process, the emission of waste gas after waste acid treatment can be effectively controlled and reduced, the harmful gas released to the environment is close to zero emission, and the modern environmental protection regulations and standards are met. By lowering the temperature of the inlet waste gas in the first spray tower 1, more optimal reaction conditions are provided for the subsequent treatment process, thereby optimizing the energy utilization efficiency and reducing the energy consumption in the treatment process. The three-stage treatment structure design makes the equipment have higher flexibility and efficiency when treating complex waste gas, and can accurately treat different types of pollutants to meet various waste gas treatment needs. Through efficient waste gas treatment and energy saving effect, the enterprise can reduce the emission cost and environmental improvement cost in long-term operation, and improve the overall economic benefit.

[0022] As shown in the embodiment, Figure 1 The first spray tower 1 is provided with a water supplement pipeline 9, the control valve of the water supplement pipeline 9 takes the temperature sensor at the bottom of the first spray tower 1 as the opening and closing signal source, and the water supplement pipeline 9 is externally connected with a cold water tower. The first spray tower 1 is used for cooling and partially adsorbing acid gas, and adopts temperature monitoring and feedback control and other automatic technologies to realize dynamic control of the spray liquid, ensure the spray cooling effect of the first spray tower 1, and improve the operation efficiency of the system.

[0023] As shown in the embodiment, Figure 1As shown in the figure, the second spray tower 2 is provided with a lye tank 10 and a lye supplement pipeline 11, and the control valve of the lye supplement pipeline 11 takes the pH sensor of the bottom liquid bin of the second spray tower 2 as the opening and closing signal source. The second spray tower 2 is mainly used for neutralizing the acidic components in the waste gas and removing the waste acid gas in the waste gas. The spray liquid is lye (such as sodium hydroxide aqueous solution or other neutralizing agent), which can neutralize the acidic gas (such as SO2, HCl, etc.) through chemical reaction, effectively reduce the acidity of the waste gas, and reduce the harm to the environment. The use of pH value monitoring and feedback control and other automation technologies ensures the reliability and safety of the treatment process.

[0024] As shown in the figure, Figure 1 As shown in the figure, the third spray tower 3 is provided with a reducing agent solution tank 12 and a reducing agent supplement pipeline 13, and the control valve of the reducing agent supplement pipeline 13 takes the NOx online sensor at the exhaust port of the third spray tower 3 as the opening and closing signal source. The third spray tower 3 is mainly used for reducing treatment of nitrogen oxides in the waste gas. The spray liquid is a reducing agent (such as ammonia water or urea solution), which can reduce nitrogen oxides to nitrogen and water through chemical reaction, thereby removing nitrogen compounds in the waste gas to achieve the purpose of purification. The concentration of nitrogen oxides is monitored to ensure complete treatment of the waste gas.

[0025] As shown in the figure, Figure 1 As shown in the figure, the recovered liquid of the first spray tower 1, the second spray tower 2 and the third spray tower 3 is returned to the waste acid disposal device for recycling. By returning the recovered liquid to the waste acid disposal device, the recycling of waste liquid can be realized, which not only reduces the discharge of waste liquid and achieves the purpose of environmental protection, but also effectively utilizes the effective components in the recovered liquid. Recycling of recovered liquid can reduce the consumption of new materials, thereby reducing the operating cost of the waste gas treatment process. The recovered liquid returned to the waste acid disposal device reduces the discharge to the external environment, achieves basic zero discharge, and improves the overall environmental protection level.

[0026] Obviously, the above embodiments of the utility model are only examples for illustrating the utility model, and are not limited to the embodiments of the utility model. Other obvious changes or variations derived from the essential spirit of the utility model still belong to the protection scope of the utility model.

Claims

1. A tail gas treatment device, characterized in that, It includes a fan (5), a first spray tower (1), a second spray tower (2) and a third spray tower (3) connected in sequence by an exhaust pipe (4). The first spray tower (1) is equipped with a water circulation spray pipe (6), the second spray tower (2) is equipped with an alkaline solution circulation spray pipe (7), and the third spray tower (3) is equipped with a reducing agent solution circulation spray pipe (8).

2. The exhaust gas treatment equipment according to claim 1, characterized in that, The first spray tower (1) is equipped with a water supply pipeline (9), and the control valve of the water supply pipeline (9) uses the temperature sensor of the bottom liquid tank of the first spray tower (1) as the opening and closing signal source.

3. The exhaust gas treatment equipment according to claim 2, characterized in that, The water supply pipeline (9) is connected to an external cooling tower.

4. The exhaust gas treatment equipment according to claim 1, characterized in that, The second spray tower (2) is equipped with an alkali tank (10) and an alkali replenishment pipeline (11). The control valve of the alkali replenishment pipeline (11) uses the pH sensor of the bottom liquid tank of the second spray tower (2) as the opening and closing signal source.

5. The exhaust gas treatment equipment according to claim 1, characterized in that, The third spray tower (3) is equipped with a reducing agent solution tank (12) and a reducing agent replenishment pipeline (13). The control valve of the reducing agent replenishment pipeline (13) uses the NOx online sensor at the exhaust port of the third spray tower (3) as the opening and closing signal source.

6. The exhaust gas treatment equipment according to claim 1, characterized in that, The recovered liquid from the first spray tower (1), the second spray tower (2) and the third spray tower (3) is returned to the waste acid treatment device for reuse.

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