Dosing device for flue gas water lifting system

Abstract

The utility model relates to the technical field of flue gas water lifting, in particular to a dosing device for a flue gas water lifting system, which comprises a water storage tank and a dosing tank, the water storage tank is used for storing condensate water; the dosing tank is connected with the water storage tank through a conveying pipeline and is used for adding alkali into the water storage tank to neutralize the pH value of condensate water; the dosing tank comprises a tank body, and a dosing port and an exhaust port are formed in the top of the tank body; an air inlet is formed in the side part of the tank body and is connected with a compressed air source; a discharge hole is formed in the bottom of the tank body and is communicated with the top of the water storage tank. Compressed air is used for driving, compressed air is injected into the chemical adding tank through the air inlet, then chemicals in the chemical adding tank are pushed to enter the conveying pipeline through the discharging port, the chemicals in the conveying pipeline are blown to the water storage tank through the compressed air, automatic control over chemical adding is achieved through the design, the requirement for manual operation is reduced, and the chemical adding efficiency is improved. And the stability and the reliability of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas water extraction technology, and in particular to a dosing device for a flue gas water extraction system. Background Technology

[0002] In water-intensive industries like coal-fired power plants, flue gas water extraction technology is gradually demonstrating its significant value as a water-saving strategy. The core of this technology lies in capturing and recovering the large amounts of water vapor carried in flue gas, converting it into reusable liquid water through condensation. This effectively reduces the power plant's dependence on external water resources, lowers production costs, and alleviates environmental pressure.

[0003] In coal-fired power plants, flue gas water extraction systems are typically located above the absorption tower (primarily for desulfurization) to maximize the capture of flue gas that, despite desulfurization, still contains water vapor. This water vapor condenses into liquid water after passing through a condenser, enabling resource recovery and reuse. However, since flue gas inevitably contains acidic gases such as sulfur dioxide and nitrogen oxides, these gases dissolve in the water during condensation, resulting in acidic extracted liquid water. Based on practical experience, the pH of this acidic water can be as low as 2. This highly acidic environment poses a severe corrosion challenge to the equipment and pipes within the extraction system, shortening equipment lifespan, increasing maintenance costs, and creating safety hazards.

[0004] To mitigate the corrosive effects of acidic water on the system, power plants need to continuously add alkaline substances such as sodium carbonate or sodium hydroxide to the flue gas lift system to adjust and maintain the pH value of the lift water within a neutral or slightly alkaline range of 5.5 to 7.0. Therefore, a dosing device for the flue gas lift system is required. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a dosing device for a flue gas water extraction system.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0007] A dosing device for a flue gas water extraction system includes a water storage tank and a dosing tank;

[0008] The water storage tank is used to store condensate; the dosing tank is connected to the water storage tank through a delivery pipeline and is used to add alkali to the water storage tank to neutralize the pH of the condensate.

[0009] The dosing tank includes a tank body, the top of which is provided with a dosing port and an exhaust port; the side of the tank body is provided with an air inlet, which is connected to a compressed air source; the bottom of the tank body is provided with a discharge port, which is connected to the top of the water storage tank through a conveying pipe.

[0010] Compared with the prior art, the present invention has the following technical effects:

[0011] Driven by compressed air, compressed air is injected into the dosing tank through the air inlet, which in turn propels the chemical inside the tank through the discharge port into the delivery pipeline. The compressed air then blows the chemical in the delivery pipeline to the water storage tank. This design achieves automated control of the dosing process, reduces the need for manual operation, and improves the stability and reliability of the system. The dosing tank has a simple and clear design, with a dosing port and an exhaust port at the top for easy addition of chemical and expulsion of gas from the tank; the air inlet on the side is directly connected to the compressed air source, simplifying the connection structure; the discharge port at the bottom is connected to the water storage tank through the delivery pipeline, ensuring smooth chemical dispensing; the entire device has a compact structure, making it easy to install and maintain.

[0012] Based on the above technical solution, the following improvements can be made:

[0013] Furthermore, an air intake pipe is provided on the air inlet, and the air intake pipe is connected to a compressed air source through a compressed air pipe; a first manual ball valve and a first pneumatic ball valve are provided on the compressed air pipe.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is that the compressed air source provides compressed air to the tank to help the agent be smoothly discharged into the water storage tank; the compressed air pipeline is equipped with a first manual ball valve and a first pneumatic ball valve to control the air intake flow and perform automated control.

[0015] Furthermore, a pressure gauge is installed on the air intake pipe.

[0016] The advantage of adopting the above-mentioned further technical solution is that it facilitates the monitoring of the internal pressure value of the tank and ensures operational safety.

[0017] Furthermore, the conveying pipeline includes a discharge pipeline and a first connecting pipeline; the discharge port is provided with a discharge pipeline, and the discharge pipeline is connected to the first connecting pipeline; a second pneumatic ball valve is provided on the discharge pipeline, and a third pneumatic ball valve is provided on the first connecting pipeline.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is that the airflow direction can be flexibly controlled by the switching combination of the second and third pneumatic ball valves. For example, when it is necessary to change the airflow path or perform equipment maintenance, the corresponding pneumatic ball valve can be closed to block the airflow and ensure operational safety.

[0019] Furthermore, the discharge pipe is connected to the compressed air pipe through a second connecting pipe, and a fourth pneumatic ball valve is installed on the second connecting pipe.

[0020] The beneficial effect of adopting the above-mentioned further technical solution is that, during the emission process, some of the gas, especially compressed air without carrying reagent particles, can be treated and reintroduced into the compressed air pipeline for reuse in reagent mixing within the tank. A fourth pneumatic ball valve is installed on the second connecting pipeline to control the flow rate and timing of the return gas, ensuring the stable operation and efficient utilization of the entire system.

[0021] Furthermore, the first pneumatic ball valve, the second pneumatic ball valve, the third pneumatic ball valve, and the fourth pneumatic ball valve are respectively connected to the controller.

[0022] The beneficial effects of adopting the above-mentioned further technical solutions are that they enable automated control and improve operational efficiency and accuracy.

[0023] Furthermore, the top of the tank is concave.

[0024] The beneficial effects of adopting the above-mentioned further technical solutions are that it facilitates the addition of chemicals and reduces splashing and waste.

[0025] Furthermore, a flange plug is provided on the dosing port.

[0026] The beneficial effect of adopting the above-mentioned further technical solution is that it ensures airtightness while facilitating rapid opening and closing, and making it convenient for drug dosing operations.

[0027] Furthermore, the bottom of the tank is conical.

[0028] The beneficial effect of adopting the above-mentioned further technical solutions is that it facilitates the centralized discharge of materials and reduces residues.

[0029] Furthermore, the tank body is provided with a flange-type inspection port on the side.

[0030] The advantage of adopting the above-mentioned further technical solutions is that it facilitates the internal inspection and cleaning of the tank. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the water storage tank and dosing tank of this utility model;

[0032] Figure 2 This is a schematic diagram of the dosing tank structure of this utility model.

[0033] The following is a list of component names represented by the reference numerals in the attached diagram:

[0034] 100. Water storage tank; 200. Tank body; 210. Dosing port; 220. Flange plug; 230. Exhaust port; 240. Air inlet; 250. Flange-type inspection hole; 260. Discharge port; 201. First manual ball valve; 202. First pneumatic ball valve; 203. Second pneumatic ball valve; 204. Third pneumatic ball valve; 205. Fourth pneumatic ball valve. Detailed Implementation

[0035] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0036] Reference Figures 1-2 A dosing device for a flue gas water extraction system includes: a water storage tank 100 and a dosing tank; the water storage tank 100 is used to store condensate; the dosing tank is connected to the water storage tank 100 and is used to add alkali to the water storage tank 100 to neutralize the pH of the condensate; the dosing tank includes a tank body 200, the top of the tank body 200 is provided with a dosing port 210 and an exhaust port 230; the side of the tank body 200 is provided with an air inlet 240, the air inlet 240 is connected to a compressed air source; the bottom of the tank body 200 is provided with a discharge port 260, the discharge port 260 is connected to the top of the water storage tank 100 through a conveying pipe.

[0037] Powdered or granular alkaline drugs (such as sodium carbonate, sodium hydroxide, etc.) are added to the dosing tank through the dosing port 210. The high-pressure airflow generated by the compressed air source propels the drug particles through the pipe to the top of the water storage tank 100. When the drug reaches the top of the water storage tank 100, it falls naturally into the water storage tank 100, where it mixes thoroughly with the flue gas or water, undergoing a chemical reaction to achieve the purpose of purification or regulation.

[0038] In this embodiment, condensate is transported to the water storage tank 100 through an inlet pipe. One end of the inlet pipe is connected to the upstream pipe that transports condensate, and the other end of the inlet pipe extends into the water storage tank 100. The condensate enters the water storage tank 100 through the inlet pipe.

[0039] In this embodiment, an air inlet pipe is provided on the air inlet 240. The air inlet pipe is connected to a compressed air source through a compressed air pipe to provide compressed air into the tank 200, so as to help the medicine be smoothly discharged into the water storage tank 100.

[0040] The compressed air pipeline is equipped with a first manual ball valve 201 and a first pneumatic ball valve 202 to control the air intake flow and perform automated control. The first manual ball valve 201 is used to manually adjust the air intake flow, suitable for initial setup or rapid adjustment in emergency situations; the first pneumatic ball valve 202 is used for automated control, automatically adjusting the air intake flow according to system requirements, improving operational efficiency and accuracy.

[0041] Specifically, the side of the tank 200 is provided with a DN32 (inner diameter 32 mm) air inlet 240 for introducing compressed air; a pressure gauge is installed on the air inlet pipe to facilitate monitoring of the internal pressure value of the tank 200 and ensure operational safety.

[0042] In this embodiment, the discharge port 260 is connected to the top of the water storage tank 100 via a conveying pipe. Specifically, the conveying pipe includes a discharge pipe and a first connecting pipe. The discharge port 260 is provided with a discharge pipe, which is connected to the first connecting pipe. The first connecting pipe is connected to the top of the water storage tank 100, allowing the pharmaceutical particles carried in the tank 200 to be smoothly discharged into the water storage tank 100, promoting uniform mixing of the pharmaceuticals.

[0043] A second pneumatic ball valve 203 is installed on the discharge pipe, and a third pneumatic ball valve 204 is installed on the first connecting pipe, enabling the discharge of gas from the tank. The combined use of these two pneumatic ball valves allows for automated control of gas discharge from the tank, opening or closing them as needed to ensure smooth drug discharge. In a specific embodiment, the water storage tank 100 has two inlets at the top, one for use and one as a backup. After stopping drug addition, the third pneumatic ball valve 204 needs to be closed to prevent water vapor from the water storage tank 100 from entering the delivery pipe and causing drug caking.

[0044] In this embodiment, to further save energy and improve efficiency, the discharge pipe is also connected to the compressed air pipe via a second connecting pipe, forming a closed-loop system. During the discharge process, some of the gas, especially the compressed air that does not carry pharmaceutical particles, can be treated and reintroduced into the compressed air pipe for reuse in the pharmaceutical mixing within the tank 200.

[0045] A fourth pneumatic ball valve 205 is installed on the second connecting pipe to control the flow rate and timing of the return gas, ensuring the stable operation and efficient utilization of the entire system.

[0046] In this embodiment, the first pneumatic ball valve 202, the second pneumatic ball valve 203, the third pneumatic ball valve 204, and the fourth pneumatic ball valve 205 are respectively connected to the controller to realize automated control and improve operating efficiency and accuracy.

[0047] In this embodiment, the top of the tank 200 is provided with a DN200 (inner diameter 200 mm) dosing port 210, which is fitted with a flange plug 220 to ensure sealing while facilitating quick opening and closing for convenient dosing operations. The top of the tank 200 is also provided with a DN32 vent port 230 to facilitate internal pressure relief and prevent excessive pressure from causing safety hazards.

[0048] In this embodiment, the tank 200 has a diameter of 1.2m and a height of 2m. This size design ensures sufficient capacity for storing drugs while facilitating operation and maintenance. The top of the tank 200 is concave to facilitate drug addition and reduce splashing and waste. The bottom of the tank 200 is conical with a DN50 discharge port 260, which facilitates centralized discharge of materials and reduces residue.

[0049] In this embodiment, the side of the tank 200 is provided with a DN250 flange-type inspection hole 250, which facilitates the internal inspection and cleaning of the tank 200.

[0050] In this embodiment, the dosing tank also includes support legs for supporting the tank body 200.

[0051] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dosing device for a flue gas water extraction system, characterized in that, The system includes a water storage tank and a dosing tank. The water storage tank is used to store condensate. The dosing tank is connected to the water storage tank and is used to add alkali to the water storage tank to neutralize the pH of the condensate. The dosing tank includes a tank body with a concave top and a conical bottom. The top of the tank body has a dosing port and an exhaust port. The side of the tank body has an air inlet connected to a compressed air source. The bottom of the tank body has a discharge port connected to the top of the water storage tank via a conveying pipe. An air inlet is provided with an air inlet pipe, which is connected to a compressed air source via a compressed air pipe. A first manual ball valve and a first pneumatic ball valve are provided on the compressed air pipe. The conveying pipe includes a discharge pipe and a first connecting pipe. The discharge port is provided with a discharge pipe, which is connected to the first connecting pipe. A second pneumatic ball valve is provided on the discharge pipe, and a third pneumatic ball valve is provided on the first connecting pipe. The discharge pipe is connected to the compressed air pipe via the second connecting pipe, and a fourth pneumatic ball valve is provided on the second connecting pipe. The first, second, third, and fourth pneumatic ball valves are respectively connected to a controller.

2. The dosing device for a flue gas water extraction system according to claim 1, characterized in that, A pressure gauge is installed on the air intake pipe.

3. A dosing device for a flue gas water extraction system according to claim 1, characterized in that, A flange plug is installed on the dosing port.

4. A dosing device for a flue gas water extraction system according to claim 1, characterized in that, The tank body is equipped with a flange-type inspection port on the side.

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