A device for regulating ph of waste water of lurgi gasifier

Abstract

This utility model relates to the field of wastewater pH control technology, and in particular to a pH control device for Lurgi gasifier wastewater. The device includes a stripping tower, a wastewater pump, a mixing pipe, and an alkali tank. An inlet pipe is installed at the top of the stripping tower, and a transmission pipe is installed at the bottom. A delivery pipe is fixedly connected to the left end of the mixing pipe, and a wastewater outlet pipe is fixedly connected to the end of the mixing pipe furthest from the delivery pipe. A control valve is installed on the outside of the wastewater outlet pipe near the mixing pipe. An alkali pump is installed on the outside of the alkali tank, and an alkali pipe is fixedly connected to the output end of the pump. A regulating valve is installed on the outside of the alkali pipe. A support frame is installed on the right side of the bottom of the mixing pipe. This utility model provides a pH control device for Lurgi gasifier wastewater that ensures thorough mixing of the alkali solution and wastewater, avoiding localized pH unevenness and effectively preventing sudden pH fluctuations, thus ensuring bacterial activity in subsequent biological denitrification processes.

Description

Technical Field

[0001] This utility model relates to the field of wastewater pH control technology, and in particular to a pH control device for Lurgi gasifier wastewater. Background Technology

[0002] If the high-ammonia-nitrogen wastewater from the Lurgi gasification furnace is discharged directly without effective treatment, the ammonia nitrogen will undergo a series of reactions in the water, consuming dissolved oxygen and leading to oxygen deficiency. This causes fish and other aquatic organisms to die due to lack of oxygen, disrupting the aquatic ecological balance. The Lurgi gasification wastewater contains acidic substances, resulting in a pH value generally below 6.5. Subsequent process experiments for the gasification wastewater involved biological denitrification. pH value refers to the concentration of hydrogen ions in the environment, which has a significant impact on the life activities of microorganisms. Changes in pH value can lead to changes in the charge of biological macromolecules (such as proteins and nucleic acids), thereby affecting their biological activity. The optimal pH range for denitrifying bacteria is 7.0–8.0.

[0003] Currently, most Lurgi gasifier wastewater pH control devices typically remove volatile impurities such as ammonia and light phenols from the wastewater through a stripping tower. The wastewater is then pumped from the bottom outlet of the stripping tower to the wastewater outlet, where an alkali solution is added and pumped to the wastewater outlet to contact the wastewater and adjust its pH value. This process can easily lead to fluctuating pH values, affecting the activity of biological bacteria and impacting the discharge indicators of ammonia nitrogen in the effluent.

[0004] Therefore, it is necessary to provide a new pH control device for Lurgi gasifier wastewater to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a pH control device for Lurgi gasifier wastewater.

[0006] The pH control device for Lurgi gasifier wastewater provided by this utility model includes: a stripping tower, a wastewater pump, a mixing pipe, and an alkali tank. A water inlet pipe is installed at the top of the stripping tower, and a transmission pipe is installed at the bottom of the stripping tower. A conveying pipe is fixedly connected to the left end of the mixing pipe, and a wastewater outlet pipe is fixedly connected to the end of the mixing pipe furthest from the conveying pipe. A control valve is installed on the outside of the wastewater outlet pipe near the mixing pipe. An alkali pump is installed on the outside of the alkali tank, and an alkali pipe is fixedly connected to the output end of the alkali pump. A regulating valve is installed on the outside of the alkali pipe. A support frame is installed on the right side of the bottom of the mixing pipe, and an online pH meter is installed at the bottom of the support frame. An agitator is installed on the inner wall of the mixing pipe.

[0007] Preferably, the agitation assembly includes two fixed frames, the ends of the two fixed frames are fixedly connected to the inner wall of the mixing tube, a rotating rod is rotatably connected to the inner wall of the two fixed frames, a plurality of agitating blades are fixedly connected to the outside of the rotating rod, and a fan blade is fixedly connected to the end of the rotating rod facing the water flow impact.

[0008] Preferably, the end of the transmission pipe furthest from the stripping tower is fixedly connected to the input end of the wastewater pump.

[0009] Preferably, the end of the delivery pipe furthest from the mixing pipe is fixedly connected to the output end of the wastewater pump.

[0010] Preferably, the end of the alkali solution tube furthest from the alkali solution pump is fixedly connected to the bottom left side of the mixing tube, and the detection end of the online pH meter is inserted into the inner wall of the mixing tube.

[0011] Preferably, the online pH meter and the regulating valve are connected by electrofusion, and the online pH meter and the control valve are connected by electrofusion.

[0012] Preferably, during wastewater transport, the fan blades are impacted and rotated, causing the agitator blades to rotate along with the rotating rod, thus achieving the agitation effect.

[0013] Compared with related technologies, the pH control device for Lurgi gasifier wastewater provided by this utility model has the following beneficial effects: This invention, by incorporating an agitation component, utilizes the impact of water flow on the fan blades to drive the rotating rod and agitator blades, ensuring thorough mixing of the alkaline solution and wastewater. This prevents localized pH unevenness, laying the foundation for stable pH regulation. Furthermore, an online pH meter monitors the pH value of the mixed liquid in real time, and works in conjunction with regulating and control valves to dynamically adjust the alkaline solution delivery rate and wastewater outlet pipe opening based on actual pH conditions. This effectively prevents sudden pH fluctuations, ensuring bacterial activity in subsequent biological denitrification processes and guaranteeing that effluent ammonia nitrogen discharge standards meet requirements. Attached Figure Description

[0014] Figure 1 A schematic diagram of the structure of the pH control device for Lurgi gasifier wastewater provided by this utility model; Figure 2 for Figure 1 The diagram shown is a structural schematic of the alkali solution tank. Figure 3 for Figure 1 The diagram shows the structure of the mixing tube.

[0015] The following are the labels in the diagram: 1. Stripping tower; 101. Inlet pipe; 102. Transfer pipe; 2. Wastewater pump; 3. Mixing pipe; 301. Delivery pipe; 302. Wastewater outlet pipe; 303. Control valve; 4. Alkali tank; 5. Alkali pump; 6. Alkali pipe; 7. Regulating valve; 8. Support frame; 9. Online pH meter; 10. Fixing frame; 11. Rotating rod; 12. Stirring blade; 13. Fan blade. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0017] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0018] Please see Figures 1 to 3 A pH control device for Lurgi gasifier wastewater includes: a stripping tower 1, a wastewater pump 2, a mixing pipe 3, and an alkali tank 4. A water inlet pipe 101 is installed at the top of the stripping tower 1, which stably receives high-ammonia-nitrogen wastewater generated by the Lurgi gasifier, ensuring that the wastewater continuously and evenly enters the stripping tower 1 for treatment. A transmission pipe 102 is installed at the bottom of the stripping tower 1, which smoothly discharges the wastewater treated by the stripping process from the stripping tower 1. The end of the transmission pipe 102 away from the stripping tower 1 is fixedly connected to the input end of the wastewater pump 2. This connection method ensures that all the wastewater flowing out through the transmission pipe 102 enters the wastewater pump 2, which provides power for subsequent transportation. A conveying pipe 301 is fixedly connected to the left end of the mixing pipe 3. The conveying pipe 301 can guide the wastewater delivered by the wastewater pump 2 into the mixing pipe 3. The end of the conveying pipe 301 away from the mixing pipe 3 is fixedly connected to the output end of the wastewater pump 2, so that the wastewater output by the wastewater pump 2 can enter the mixing pipe 3 without leakage through the conveying pipe 301. A wastewater outlet pipe 302 is fixedly connected to the end of the mixing pipe 3 away from the conveying pipe 301. The wastewater outlet pipe 302 is used to transport the treated wastewater in the mixing pipe 3 to the subsequent biological denitrification process. A control valve 303 is installed on the outside of the end of the wastewater outlet pipe 302 near the mixing pipe 3. The control valve 303 can flexibly adjust the flow cross-sectional area of ​​the wastewater outlet pipe 302, thereby controlling the outflow speed and flow rate of the wastewater.

[0019] A alkali pump 5 is installed externally on the alkali tank 4. The alkali pump 5 provides power for the transport of alkali, drawing alkali from the tank 4 and transporting it outwards. An alkali pipe 6 is fixedly connected to the output end of the alkali pump 5, providing a channel for the flow of alkali and ensuring that the alkali is transported along a predetermined path. The end of the alkali pipe 6 away from the alkali pump 5 is fixedly connected to the bottom left side of the mixing pipe 3, allowing the alkali to accurately enter the mixing pipe 3 and mix with wastewater. A regulating valve 7 is installed externally on the alkali pipe 6, which can precisely control the flow rate of alkali in the alkali pipe 6 by changing the opening of its valve core. A support frame 8 is installed on the bottom right side of the mixing pipe 3, providing stability for the online pH meter 9. A solid mounting support ensures that the online pH meter 9 will not shake or shift during operation. The online pH meter 9 is installed at the bottom of the support frame 8. The online pH meter 9 can monitor the pH value of the liquid in the mixing tube 3 in real time. The detection end of the online pH meter 9 is inserted into the inner wall of the mixing tube 3 to ensure that the detection end can directly contact the mixed liquid, thereby obtaining accurate pH value data. The online pH meter 9 is electrofused to the regulating valve 7, so that the pH value signal detected by the online pH meter 9 can be transmitted to the regulating valve 7 in a timely manner, providing a basis for the operation of the regulating valve 7. The online pH meter 9 is electrofused to the control valve 303, so that the online pH meter 9 can synchronously transmit the detection signal to the control valve 303, realizing the coordinated operation of the two.

[0020] An agitator is installed on the inner wall of the mixing tube 3. This agitator thoroughly stirs the wastewater and alkaline solution within the mixing tube 3, improving the mixing effect. The agitator includes two fixed frames 10, the ends of which are fixedly connected to the inner wall of the mixing tube 3. The fixed frames 10 stably support the rotating rod 11 within the mixing tube 3, ensuring that the rotating rod 11 does not shift during rotation. The rotating rod 11 is rotatably connected to the inner wall of the two fixed frames 10, allowing it to rotate flexibly under the support of the fixed frames 10. It also includes an agitator blade 12 and a fan blade 13. The rotation provides shaft support. Multiple agitator blades 12 are fixedly connected to the outside of the rotating rod 11. When the multiple agitator blades 12 rotate, they can form a large agitation range, which enhances the stirring force of the liquid. A fan blade 13 is fixedly connected to the end of the rotating rod 11 facing the water flow impact. The fan blade 13 can convert the kinetic energy of the water flow into its own rotational kinetic energy. When the wastewater is transported, it will impact the fan blade 13 and then rotate, so that the agitator blade 12 rotates with the rotating rod 11 to achieve the agitation effect, thereby making the wastewater and alkaline solution more evenly mixed in the mixing tube 3.

[0021] The working principle of the pH control device for Lurgi gasifier wastewater provided by this utility model is as follows: The high ammonia nitrogen wastewater generated by the Lurgi gasifier first enters the stripping tower (1) through the inlet pipe (101). Inside the stripping tower (1), the wastewater undergoes a stripping process to remove volatile impurities such as ammonia and light phenols. After the impurity removal is completed, the wastewater flows out of the stripping tower (1) through the transmission pipe (102). At this time, the wastewater pump (2) is started. Under the action of the wastewater pump (2), the wastewater is transported to the transmission pipe (301) and flows along the transmission pipe (301) to the mixing pipe (3). At the same time, the alkali solution in the alkali solution tank (4) is driven by the alkali solution pump (5) and transported outward through the alkali solution pipe (6). Outside the alkali solution pipe (6), the regulating valve (7) operates according to the monitoring of the online pH meter (9) to control the amount of alkali solution transported. After the alkali solution enters the mixing pipe (3) through the alkali solution pipe (6), it meets the wastewater flowing in from the conveying pipe (301). When wastewater and alkaline solution flow in the mixing tube (3), the water flow will impact the fan blades (13) in the stirring assembly. After being impacted, the fan blades (13) start to rotate. The rotation of the fan blades (13) drives the rotating rod (11) to rotate together. When the rotating rod (11) rotates, it will carry multiple stirring blades (12) to rotate inside the mixing tube (3). These stirring blades (12) continuously stir the wastewater and alkaline solution in the mixing tube (3) to make them fully mixed. At the bottom right of the mixing pipe (3), an online pH meter (9) installed on the support frame (8) continuously monitors the pH value of the mixed liquid. When the online pH meter (9) detects that the pH value of the mixed liquid does not meet the optimal range of 7.0~8.0 required by the denitrifying bacteria, it will transmit a signal to the regulating valve (7) and the control valve (303). If the pH value is too low, the regulating valve (7) will increase the amount of alkali solution delivered, allowing more alkali solution to enter the mixing pipe (3) and mix with the wastewater. If the pH value is too high, the regulating valve (7) will reduce the amount of alkali solution delivered. At the same time, the control valve (303) will also adjust the opening of the wastewater outlet pipe (302) according to the signal from the online pH meter (9) to ensure that the wastewater with a suitable pH value that finally flows out from the wastewater outlet pipe (302) can meet the water quality requirements of the subsequent biological denitrification process, avoid the impact of pH value fluctuations on the activity of biological bacteria, and ensure that the ammonia nitrogen discharge index of the effluent meets the standards.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A pH control device for Lurgi gasifier wastewater, characterized in that, include: The stripping tower (1), wastewater pump (2), mixing pipe (3), and alkali tank (4) are equipped with a water inlet pipe (101) at the top and a transmission pipe (102) at the bottom. The left end of the mixing pipe (3) is fixedly connected to a conveying pipe (301). The end of the mixing pipe (3) away from the conveying pipe (301) is fixedly connected to a wastewater outlet pipe (302). A control valve (303) is installed on the outside of the end of the wastewater outlet pipe (302) close to the mixing pipe (3). The alkaline pump (5) is installed on the outside of the alkaline tank (4). The output end of the alkaline pump (5) is fixedly connected to the alkaline pipe (6). The alkaline pipe (6) is equipped with a regulating valve (7). The bottom right side of the mixing pipe (3) is equipped with a support frame (8). The bottom end of the support frame (8) is equipped with an online pH meter (9). A stirring component is installed on the inner wall of the mixing tube (3).

2. The pH control device for Lurgi gasifier wastewater according to claim 1, characterized in that, The agitation assembly includes two fixed frames (10), the ends of the two fixed frames (10) are fixedly connected to the inner wall of the mixing tube (3), the inner walls of the two fixed frames (10) are rotatably connected to a rotating rod (11), a plurality of agitating blades (12) are fixedly connected to the outside of the rotating rod (11), and a fan blade (13) is fixedly connected to the end of the rotating rod (11) facing the water flow impact.

3. The pH control device for Lurgi gasifier wastewater according to claim 1, characterized in that, The end of the transmission pipe (102) away from the stripping tower (1) is fixedly connected to the input end of the wastewater pump (2).

4. The pH control device for Lurgi gasifier wastewater according to claim 1, characterized in that, The end of the delivery pipe (301) away from the mixing pipe (3) is fixedly connected to the output end of the wastewater pump (2).

5. The pH control device for Lurgi gasifier wastewater according to claim 1, characterized in that, The end of the alkali solution tube (6) away from the alkali solution pump (5) is fixedly connected to the bottom left side of the mixing tube (3), and the detection end of the online pH meter (9) is inserted into the inner wall of the mixing tube (3).

6. The pH control device for Lurgi gasifier wastewater according to claim 1, characterized in that, The online pH meter (9) and the regulating valve (7) are connected by electrofusion, and the online pH meter (9) and the control valve (303) are connected by electrofusion.

7. The pH control device for Lurgi gasifier wastewater according to claim 2, characterized in that, When transporting wastewater, the fan blades (13) are impacted and rotated, causing the stirring blades (12) to rotate with the rotating rod (11) to achieve the stirring effect.

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