A flue gas tower dosing device

Abstract

The utility model discloses a kind of waste gas tower dosing device, belong to waste gas tower technical field, the device contains the central medicine supply platform located in the outside of waste gas tower, which is provided with medicament storage tank, medicament storage tank bottom and waste gas tower dosing pipe highest place have 0.8-1.5m height difference, can be assisted by gravity medicament delivery;Medicament storage tank discharge port and waste gas tower dosing pipe between setting dosing pipeline, bypass pipe is mounted on the dosing pipeline near medicament storage tank side, bypass pipe is provided with pressure pump, provides power for medicament delivery;Dosing pipeline is near waste gas tower side and is sequentially provided with pressure sensor and solenoid valve, for monitoring pipeline pressure, control medicament delivery on-off;Pressure pump and pressure sensor are linked control by PLC controller.This device utilizes height difference to realize gravity self-flow, and installs pressure pump in dosing pipe front end, starts pressure auxiliary when insufficient or adding is not smooth.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas tower technology, and relates to a waste gas tower dosing device that combines gravity flow and pressurization. Background Technology

[0002] In the field of waste gas treatment, waste gas treatment towers are commonly used equipment, and the dosing process is crucial to the treatment effect. Currently, waste gas treatment towers mainly use two methods for adding chemicals: dosing pumps or gravity flow.

[0003] During the waste gas treatment process, the spray liquid continuously absorbs acidic / alkaline pollutants from the waste gas, causing the pH value of the liquid in the tank to fluctuate constantly. When the set upper and lower limits are reached, chemical dosing is required for adjustment. However, when the concentration of pollutants in the waste gas is high and the air volume is large, the pH value changes rapidly, requiring the dosing pump to be started and stopped frequently. This not only increases the risk of equipment failure but also consumes a large amount of electrical energy, increasing operating costs.

[0004] In addition, when the concentration of the added agent is high or the liquid level in the agent storage tank is low, the agent in gravity flow mode is prone to precipitation and crystallization in the pipeline, causing pipeline blockage, or causing problems with smooth addition due to insufficient pressure. Utility Model Content

[0005] The purpose of this invention is to provide a chemical dosing device for a waste gas tower, which adopts a combination of gravity flow and pressurization to reduce the maintenance cost and energy consumption of the dosing system.

[0006] The objective of this utility model is achieved through the following technical solution: A chemical dosing device for an exhaust gas tower includes a central chemical supply platform located outside the exhaust gas tower. A chemical storage tank is installed on the central supply platform. There is a height difference of 0.8-1.5m between the bottom of the chemical storage tank and the highest point of the dosing pipe on the exhaust gas tower to utilize gravity-assisted chemical delivery. A dosing pipe is installed between the outlet of the chemical storage tank and the dosing pipe on the exhaust gas tower. A bypass pipe is installed on the dosing pipe adjacent to the chemical storage tank, and a pressure pump is installed on the bypass pipe to provide power for chemical delivery. A pressure sensor and a solenoid valve are sequentially installed on the dosing pipe adjacent to the exhaust gas tower to monitor the pipe pressure and control the on / off of chemical delivery. The pressure pump and pressure sensor are linked and controlled by a PLC controller.

[0007] As a further improvement of one embodiment of the present invention, when the pressure sensor detects that the pressure in the dosing pipeline is lower than or reaches a set threshold, the pressure sensor sends a signal to the PLC controller, and the PLC controller controls the pressurization pump to start or stop.

[0008] As a further improvement of one embodiment of this utility model, the pressure pump is a chemical-grade pressure pump.

[0009] As a further improvement of one embodiment of this utility model, a pH meter is provided in the water tank inside the exhaust gas tower, and the pH meter and the solenoid valve are linked and controlled by a PLC controller.

[0010] As a further improvement of one embodiment of this utility model, the pH meter has a measurement accuracy of not less than ±0.1pH and a signal sampling frequency of 1 time / minute to ensure real-time monitoring of pH changes in the solution in the water tank; the pH meter uses a control range of 5.5-8.5. When the pH meter reading is ≤5.5, the PLC controller sends an open signal to the solenoid valve, the solenoid valve response time is ≤0.5 seconds, and at the same time sends a "maintain rated power" signal to the booster pump to ensure stable delivery of the reagent; when the pH meter reading is ≥8.5, the PLC controller sends a close signal to the solenoid valve. After the solenoid valve closes, the PLC controller sends a "low power standby" signal to the booster pump after a 5-second delay to avoid residual crystallization of the reagent in the pipeline.

[0011] As a further improvement of one embodiment of the present invention, a first check valve is provided on the bypass pipe outside the outlet of the pressurizing pump, and the conduction direction of the first check valve is consistent with the drug delivery direction; a second check valve is provided on the drug delivery pipeline enclosed by the bypass pipe, and the conduction direction of the second check valve is consistent with the drug delivery direction.

[0012] As a further improvement of one embodiment of the present invention, a first switching valve is also provided on the bypass pipe. The first switching valve is located on the side of the first check valve away from the pressurizing pump. A second switching valve is provided on the dosing pipeline on the side of the second check valve away from the drug storage tank. The second switching valve is located on the dosing pipeline surrounded by the bypass pipe.

[0013] The above technical solution has the following beneficial effects: by utilizing the height difference between the dosing pipe of the agent storage tank and the waste gas tower, and taking advantage of the gravity flow of the agent, a pressure pump is installed at the front end of the dosing pipe. If insufficient pressure is detected at the end of the pipeline or other reasons cause the agent dosing to be obstructed, the pressure pump is started to provide pressure assistance. Attached Figure Description

[0014] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0015] The structures, proportions, sizes, etc. shown in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0016] Figure 1 This is a structural schematic diagram of the present invention.

[0017] In the picture: 1. Exhaust gas tower; 2. Centralized drug supply platform; 3. Pharmaceutical storage tanks; 4. Chemical dosing pipeline; 5. Bypass pipe; 6. Pressure pump; 7. Pressure sensor; 8. Solenoid valve; 9. PLC controller; 10. First check valve; 11. Second check valve; 12. First switching valve; 13. Second switching valve. Detailed Implementation

[0018] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0019] First embodiment, such as Figure 1 As shown, a chemical dosing device for an exhaust gas tower includes a central chemical supply platform 2 located outside the exhaust gas tower 1. A chemical storage tank 3 is installed on the central chemical supply platform 2. There is a height difference of 0.8-1.5m between the bottom of the chemical storage tank 3 and the highest point of the dosing pipe of the exhaust gas tower 1. This allows full use of the chemical's own weight to assist in the delivery of the chemical from the chemical storage tank 3 to the exhaust gas tower 1, thereby reducing energy consumption.

[0020] The outlet of the chemical storage tank 3 is connected to the dosing pipe of the exhaust gas tower 1 via a dosing pipe 4. The dosing pipe 4 is designed to minimize bends to effectively reduce chemical buildup within the pipe. A U-shaped bypass pipe 5 is installed on the dosing pipe 4 adjacent to the chemical storage tank 3, and a booster pump 6 is mounted on this bypass pipe 5. As a key component providing power for chemical delivery, the booster pump 6 provides additional power when gravity delivery is insufficient, ensuring a stable and smooth flow of chemicals into the exhaust gas tower 1.

[0021] On the side of the dosing pipeline 4 near the exhaust gas tower 1, a pressure sensor 7 and a solenoid valve 8 are installed sequentially. The pressure sensor 7 constantly monitors the pressure inside the dosing pipeline 4. When the pressure is detected to be lower than or reach a set threshold (P < 0.5 bar), the pressure sensor 7 quickly sends a signal to the PLC controller 9. After receiving the signal, the PLC controller 9 precisely controls the start or stop of the pressurization pump 6. The solenoid valve 8 is used to control the on / off of the chemical delivery, and the dosage of the chemical can be flexibly adjusted according to actual needs.

[0022] In this embodiment, the booster pump 6 is a chemical-grade booster pump, which has good acid and alkali resistance and can effectively adapt to the chemical dosing environment of the waste gas tower. Its recommended flow rate is in the range of 8-10 m³, and its head is between 8-12 m. Other similar booster pumps with comparable performance parameters that meet the dosing requirements can also be used.

[0023] In this waste gas tower dosing device, a first check valve 10 is installed on the bypass pipe 5 outside the outlet of the pressurization pump 6. The conduction direction of the first check valve 10 is strictly consistent with the direction of chemical delivery. Its function is to prevent backflow of the chemical during delivery, ensuring that the chemical can only flow in the predetermined direction, thus guaranteeing the stability and reliability of the dosing process. A second check valve 11 is installed on the dosing pipe 4 enclosed by the bypass pipe 5. Similarly, the conduction direction of the second check valve 11 is also consistent with the direction of chemical delivery, further strengthening the function of preventing chemical backflow.

[0024] In addition, a first switching valve 12 is installed on the bypass pipe 5, located on the side of the first check valve 10 away from the pressurizing pump 6, which can conveniently control the flow of the agent in the bypass pipe 5. A second switching valve 13 is installed on the dosing pipe 4 on the side of the second check valve 11 away from the agent storage tank 3, and the second switching valve 13 is located on the dosing pipe 4 enclosed by the bypass pipe 5. When it is necessary to use the pressurizing pump 6 to supply material, the second switching valve 13 can be closed, and the bypass pipe 5 can supply material to the dosing pipe 4 alone.

[0025] In this embodiment, a pH meter is installed in the water tank inside the exhaust gas tower 1. The pH meter and the solenoid valve 8 are linked and controlled by the PLC controller 9.

[0026] Specifically, the pH meter has a measurement accuracy of no less than ±0.1 pH, enabling precise acquisition of the acidity and alkalinity information of the solution in the water tank. Furthermore, its signal sampling frequency is set to 1 time / minute, ensuring real-time and effective monitoring of pH changes in the solution within the tank. The pH meter operates within a control range of 5.5-8.5. When the pH meter reading is less than or equal to 5.5, the PLC controller 9 sends an open signal to the solenoid valve 8. The solenoid valve 8 responds in less than or equal to 0.5 seconds, allowing for rapid opening to dispensing the reagent. Simultaneously, the PLC controller 9 sends a "maintain rated power" signal to the booster pump 6 to ensure stable reagent delivery. When the pH meter reading is greater than or equal to 8.5, the PLC controller 9 first sends a close signal to the solenoid valve 8. After the solenoid valve 8 closes, to prevent reagent residue crystallization in the pipeline, the PLC controller 9 delays for 5 seconds before sending a "low power standby" signal to the booster pump 6.

[0027] The waste gas tower dosing device provided by this utility model innovatively combines gravity flow with a pressurization device. Utilizing the height difference between the chemical storage tank 3 and the dosing pipe of the waste gas tower 1, the chemical is initially conveyed by gravity. Simultaneously, a pressurization pump 6 is installed at the front end of the dosing pipe. When the pressure sensor 7 detects insufficient pressure at the end of the pipeline, or when other factors cause difficulties in chemical dosing, the pressurization pump 6 immediately starts to provide pressurization assistance. This design not only ensures a stable and effective supply of chemical to the waste gas tower, but also reduces maintenance costs caused by frequent equipment start-ups and shutdowns, minimizes environmental risks that may result from equipment failure, and reduces energy consumption to some extent.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A chemical dosing device for a waste gas tower, characterized in that, The system includes a central drug supply platform located outside the exhaust gas tower. A drug storage tank is installed on the central drug supply platform. There is a height difference of 0.8-1.5m between the bottom of the drug storage tank and the highest point of the dosing pipe of the exhaust gas tower to utilize gravity-assisted drug delivery. A dosing pipeline is installed between the outlet of the drug storage tank and the dosing pipe of the exhaust gas tower. A bypass pipe is installed on the dosing pipeline near the drug storage tank, and a pressure pump is installed on the bypass pipe to provide power for drug delivery. A pressure sensor and a solenoid valve are sequentially installed on the dosing pipeline near the exhaust gas tower to monitor pipeline pressure and control the on / off of drug delivery. The pressure pump and pressure sensor are linked and controlled by a PLC controller.

2. The waste gas tower dosing device according to claim 1, characterized in that, When the pressure sensor detects that the pressure in the dosing pipeline is lower than or reaches a set threshold, the pressure sensor sends a signal to the PLC controller, and the PLC controller controls the pressurization pump to start or stop.

3. The waste gas tower dosing device according to claim 1, characterized in that, The booster pump is a chemical-grade booster pump.

4. The waste gas tower dosing device according to claim 1, characterized in that, The water tank inside the exhaust gas tower is equipped with a pH meter, and the pH meter and the solenoid valve are linked and controlled by a PLC controller.

5. The waste gas tower dosing device according to claim 1, characterized in that, A first check valve is installed on the bypass pipe outside the outlet of the pressurizing pump, and the conduction direction of the first check valve is consistent with the drug delivery direction; a second check valve is installed on the drug delivery pipeline surrounded by the bypass pipe, and the conduction direction of the second check valve is consistent with the drug delivery direction.

6. The waste gas tower dosing device according to claim 5, characterized in that, The bypass pipe is also equipped with a first switch valve, which is located on the side of the first check valve away from the pressurizing pump. A second switch valve is installed on the dosing pipe on the side of the second check valve away from the chemical storage tank, and the second switch valve is located on the dosing pipe surrounded by the bypass pipe.

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