Atmospheric desulfurization device for environmental protection engineering

Abstract

The utility model relates to the technical field of environment-friendly desulfurization equipment, and discloses an atmosphere desulfurization device for environment-friendly engineering, which comprises a circulating tank, a first desulfurization tower and a second desulfurization tower are respectively communicated and connected with two sides above the circulating tank, the first desulfurization tower and the second desulfurization tower are respectively communicated and connected with the circulating tank, and a feed port is arranged on the side wall of one side of the first desulfurization tower. The two towers are adopted for absorption desulfurization, specifically, the first desulfurization tower mainly plays a role in a dilute acid storage tank, analysis of hydrogen peroxide in dilute acid and humidification of flue gas, the technological process is short, and operation is reliable; the desulfurization efficiency is high, the phenomena of equipment blockage and abrasion are avoided, the resistance is small, and the system is energy-saving; the by-product dilute acid can be completely recovered, and no secondary pollutant is generated.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection desulfurization equipment, in particular to an atmospheric desulfurization device for environmental protection projects. Background Art

[0002] The old acid production system of the lead and zinc plant adopts the flue gas treatment process of zinc oxide + air oxidation + wet electrostatic precipitator. The SO2 concentration of the treated flue gas is within the design index of 6.94%, and the amount of desulfurization slurry is controlled at 90m3. 3 / d, the exhaust SO2 concentration is controlled at 10-60mg / m 3 , which can meet the production needs, and the completely oxidized slurry is returned to the leaching without affecting the wet system.

[0003] In addition, due to the influence of the tail gas desulfurization process of the new acid production system, the release of production capacity of the roasting and slag treatment workshops is restricted, and it also has a great impact on the wet system. It is necessary to solve the bottleneck restricting production through technical transformation.

[0004] In order to increase production capacity, save costs and adapt to new environmental protection policies, it is necessary to transform the tail gas desulfurization process of the new acid system and select a desulfurization process suitable for the characteristics of the lead and zinc plant to ensure continuous, stable and low-cost production. Utility Model Content

[0005] The purpose of the utility model is to provide an atmospheric desulfurization device for environmental protection engineering to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An atmospheric desulfurization device for environmental protection projects comprises a circulation tank, wherein a desulfurization tower 1 and a desulfurization tower 2 are respectively connected on both sides above the circulation tank, and the desulfurization tower 1 and the desulfurization tower 2 are respectively connected to the circulation tank, a feed port is provided on one side wall of the desulfurization tower 1, a spray device is provided in the inner cavity of the desulfurization tower 1, a feed port 2 connected to the spray device is provided at the upper end of the desulfurization tower 1, a conveying device is connected between the desulfurization tower 1 and the desulfurization tower 2, a wet electrostatic precipitator is provided above the desulfurization tower 2, a flue gas outlet is connected above the wet electrostatic precipitator, a hydrogen peroxide delivery pump is connected to the circulation tank, and two conduits 2 are connected to the hydrogen peroxide delivery pump, one of the conduits 2 is connected to the circulation tank, and the other conduit 2 extends from the upper end of the desulfurization tower 2 into it.

[0008] The desulfurization tower 1 and the desulfurization tower 2 are provided with a plurality of observation windows in sequence from top to bottom.

[0009] The spraying device includes a connecting tube connected to the second feed port, the top of the connecting tube is connected to the top of the desulfurization tower, and the bottom of the connecting tube is connected to a spray head, which is provided with a number of evenly distributed spray holes. The spray head is a full-section nozzle with an internal filler layer of 2.5 meters.

[0010] The conveying device includes a circulating conveying pump, both ends of which are connected to a conduit. The circulating conveying pump is respectively connected to desulfurization tower one and desulfurization tower two through two conduits. The connection between the conduit and desulfurization tower two is located at the bottom of the side wall of desulfurization tower two, and the connection between the conduit and desulfurization tower one is located at the upper part of the side wall of desulfurization tower one.

[0011] The inner cavity of the circulation tank is provided with a liquid level meter, a concentration meter and a flow meter for detecting the hydrogen peroxide liquid.

[0012] The liquid level meter, concentration meter and flow meter are controlled by DCS intelligently to realize automatic interlocking control of temperature, concentration, flow, liquid level, etc., and meet the full-automatic intelligent control standard.

[0013] The concentration of hydrogen peroxide in the desulfurization tower 1 and the desulfurization tower 2 is controlled at 0.3%.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0015] 1) The utility model adopts two towers for absorption desulfurization. Specifically, the desulfurization tower mainly serves as a dilute acid storage tank, desorbs hydrogen peroxide in the dilute acid, and humidifies the flue gas. The process flow is short and the operation is reliable. The desulfurization efficiency is high, there is no equipment clogging and wear, the resistance is small, and the system is energy-saving. The by-product dilute acid can be fully recovered and no secondary pollutants are generated.

[0016] 2) The utility model is provided with a desulfurization tower 2, and the absorption liquid is continuously returned to the desulfurization tower 1 according to the increase of the acid concentration. When the dilute acid concentration of the desulfurization tower 1 reaches about 20%, the dilute acid is sent to the dry absorption process or the leaching workshop through the external discharge pump for reuse, thereby facilitating operation and precise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional Figure 1 ;

[0018] Figure 2 This is a three-dimensional Figure 2 ;

[0019] Figure 3 This is a three-dimensional Figure 3 ;

[0020] Figure 4 This is a three-dimensional Figure 4;

[0021] In the figure: 1. Circulation tank; 2. Desulfurization tower 1; 3. Desulfurization tower 2; 4. Observation window; 5. Feed port; 6. Connecting tube; 7. Spray head; 8. Feed port; 9. Circulation pump; 10. Conduit; 11. Wet electrostatic precipitator; 12. Flue gas outlet; 13. Hydrogen peroxide delivery pump; 14. Conduit 2; 15. Liquid level meter; 16. Concentration meter; 17. Flow meter. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0024] like Figure 1 As shown, the utility model provides an atmospheric desulfurization device for environmental protection engineering and a method for using the same, including a desulfurization device and a desulfurization method; the desulfurization device includes a circulation tank 1, and a desulfurization tower 2 and a desulfurization tower 3 are connected on both sides above the circulation tank 1, and the desulfurization tower 1 and the desulfurization tower 2 are respectively provided with observation windows 4 from top to bottom. The desulfurization tower 1 and the desulfurization tower 2 are respectively connected with the circulation tank 1, and a feed port 5 is provided on one side wall of the desulfurization tower 1. The inner cavity of the desulfurization tower 2 is provided with a spray device. The upper end of the desulfurization tower 1 is provided with a feed port 2 8 connected to a spray device, a conveying device is connected between the desulfurization tower 1 and the desulfurization tower 2 3, a wet electrostatic precipitator 11 is provided above the desulfurization tower 2 3, a flue gas outlet 12 is connected above the wet electrostatic precipitator 11, a hydrogen peroxide delivery pump 13 is connected to the circulation tank 1, and two conduits 2 14 are connected to the hydrogen peroxide delivery pump 13, one of the conduits 2 14 is connected to the circulation tank 1, and the other conduit 2 14 extends from the upper end of the desulfurization tower 2 3 into the circulation tank 1;

[0025] The desulfurization method adopts the method of first allowing the flue gas after acid production to enter the desulfurization tower 2 of the desulfurization process, and to react with the dilute sulfuric acid containing hydrogen peroxide sprayed from top to bottom in a countercurrent manner to perform a desulfurization, and at the same time play a role in humidifying the flue gas. As the absorption proceeds, the acid concentration of the circulating liquid is gradually increased. The flue gas in the desulfurization tower 2 enters the tower from the lower part of the desulfurization tower 2 3, and contacts with the circulating liquid sprayed in the tower in a countercurrent manner, and completes the oxidation reaction in the packing layer. In this process, SO2 in the flue gas generates sulfuric acid and enters the circulating liquid. The liquid phase falls into the circulation tank 1 at the bottom of the tower, and the gas phase is discharged from the top outlet of the tower, thereby forming a continuous circulation absorption of SO2 flue gas. The flue gas with SO2 removed passes through the wet electrostatic precipitator 11 at the top of the desulfurization tower to remove particulate matter and acid mist in the flue gas, and finally enters the flue gas outlet 13 for discharge.

[0026] like Figure 3 and Figure 4 As shown, the spraying device includes a connecting tube 6 connected to feed port 2 8 . A spray head 7 is connected through the bottom of the connecting tube 6 . The spray head 7 is equipped with several evenly distributed spray holes. The spray head 7 is a full-section nozzle with an internal filler layer of 2.5 meters. The flue gas after acid production first enters desulfurization tower 1 2 in the desulfurization process. It reacts with dilute sulfuric acid containing hydrogen peroxide sprayed from top to bottom in a countercurrent manner, undergoing primary desulfurization and simultaneously humidifying the flue gas. As absorption proceeds, the acid concentration in the circulating fluid gradually increases.

[0027] like Figure 2 As shown: the conveying device includes a circulating conveying pump 9, both ends of the circulating conveying pump 9 are connected with a conduit 10, the other ends of the two conduits 10 are respectively connected with desulfurization tower 1 2 and desulfurization tower 2 3, the connection between the conduit 10 and desulfurization tower 2 3 is located at the bottom of the side wall of desulfurization tower 2 3, and the connection between the conduit 10 and desulfurization tower 1 2 is located at the upper part of the side wall of desulfurization tower 1 2.

[0028] like Figure 3 As shown: the inner cavity of the circulation tank 1 is provided with a liquid level meter 15, a concentration meter 16 and a flow meter 17 for detecting the hydrogen peroxide liquid. The liquid level meter 15, the concentration meter 16 and the flow meter 17 are controlled by DCS intelligent control to realize automatic interlocking control of temperature, concentration, flow, liquid level, etc. The concentration of hydrogen peroxide in the desulfurization tower 1 2 and the desulfurization tower 2 3 is controlled at 0.3%.

[0029] In practice, the hydrogen peroxide desulfurization process fully utilizes the two existing desulfurization towers for new acid desulfurization. It employs a two-stage desulfurization tower absorption process, with the desulfurized tail gas and sprayed absorption liquid operating in a countercurrent mode. The flue gas after acid production first enters desulfurization tower 1 (2), where it undergoes a countercurrent reaction with dilute sulfuric acid containing hydrogen peroxide sprayed from top to bottom, undergoing primary desulfurization while also humidifying and desorbing the flue gas. As absorption proceeds, the acid concentration in the circulating liquid gradually increases. Flue gas exiting desulfurization tower 1 (2) enters desulfurization tower 2 (3) from the lower portion, where it countercurrently comes into contact with the circulating liquid sprayed within the tower. Oxidation occurs in the packing layer, and SO2 in the flue gas is converted into sulfuric acid, which enters the circulating liquid. The liquid phase falls to the circulation tank at the bottom of the tower, while the gas phase is discharged from the tower's top outlet, thus forming a continuous cycle of SO2 flue gas absorption. The SO2-free flue gas passes through the wet electrostatic precipitator 12 at the top of desulfurization tower 3, where particulate matter and acid mist are removed from the flue gas. Finally, it enters flue gas outlet 13 for discharge. As the reaction progresses, the concentration of sulfuric acid in the circulating liquid in the tower gradually increases. The concentration of hydrogen peroxide added to the tower is usually around 6.8%-7.8%, and the hydrogen peroxide concentration in the tower is controlled below 0.3%. The hydrogen peroxide desulfurization process can remove a small amount of nitrogen oxides without generating new nitrogen oxides.

Claims

1. An atmospheric desulfurization device for environmental protection engineering, characterized by: The invention comprises a circulation tank (1), wherein a desulfurization tower 1 (2) and a desulfurization tower 2 (3) are respectively connected on both sides above the circulation tank (1), a feed port (5) is provided at the bottom of the side wall of the desulfurization tower 1 (2), a spray device is provided in the inner cavity of the desulfurization tower 1 (2), a feed port 2 (8) connected to the spray device is provided at the upper end of the desulfurization tower 1 (2), a conveying device is connected between the desulfurization tower 1 (2) and the desulfurization tower 2 (3), a wet electrostatic precipitator (11) is provided above the desulfurization tower 2 (3), a flue gas outlet (12) is connected above the wet electrostatic precipitator (11), a hydrogen peroxide delivery pump (13) is provided between the circulation tank (1) and the desulfurization tower 2 (3), and the input end and the output end of the hydrogen peroxide delivery pump (13) are both connected to the upper end of the desulfurization tower 2 (3) and the circulation tank (1) through a conduit 2 (14).

2. The atmospheric desulfurization device for environmental protection engineering according to claim 1, characterized in that: The desulfurization tower 1 (2) and the desulfurization tower 2 (3) are provided with a plurality of observation windows (4) in sequence from top to bottom.

3. The atmospheric desulfurization device for environmental protection engineering according to claim 1, characterized in that: The spraying device comprises a connecting cylinder (6) connected to the second feed port (8), a spray head (7) is provided at the bottom of the connecting cylinder (6), and a plurality of evenly distributed spray holes are provided on the spray head (7).

4. The atmospheric desulfurization device for environmental protection engineering according to claim 3, characterized in that: The spray head (7) is a full-section spray head with an internal filler layer of 2.5 meters.

5. The atmospheric desulfurization device for environmental protection engineering according to claim 1, characterized in that: The conveying device includes a circulating conveying pump (9), both ends of which are connected to conduits (10). The circulating conveying pump (9) is connected to the desulfurization tower 1 (2) and the desulfurization tower 2 (3) through the two conduits (10), and the connection between the conduit (10) and the desulfurization tower 2 (3) is located at the bottom of the side wall of the desulfurization tower 2 (3), and the connection between the conduit (10) and the desulfurization tower 1 (2) is located at the upper part of the side wall of the desulfurization tower 1 (2).

6. The atmospheric desulfurization device for environmental protection engineering according to claim 1, characterized in that: The inner cavity of the circulation tank (1) is provided with a liquid level meter (15), a concentration meter (16) and a flow meter (17) for detecting the hydrogen peroxide liquid.

7. The atmospheric desulfurization device for environmental protection engineering according to claim 6, characterized in that: The concentration of hydrogen peroxide in the desulfurization tower 1 (2) and the desulfurization tower 2 (3) is 0.3%.

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