Decarburization device for demineralized water tank

Abstract

The utility model discloses a demineralized water tank decarbonizing device which comprises a shell, an upper layer cavity and a middle layer cavity are arranged in the shell, the top of the upper layer cavity is connected and communicated with a medicament adding pipeline and a breathing tube, and the upper layer cavity is communicated with the middle layer cavity only through an upper-lower layer medicament communicating pipe. The middle-layer cavity is communicated with the top of the desalted water tank through a desalted water tank top communicating pipe; the bottom surface of the upper-layer cavity is connected and communicated with the upper end of an upper-layer medicament emptying pipe; an upper-layer medicament emptying valve is arranged on the upper-layer medicament emptying pipe; the bottom surface of the middle-layer cavity is connected and communicated with the upper end of a lower-layer medicament emptying pipe; and a lower-layer medicament emptying valve is arranged on the lower-layer medicament emptying pipe. The device is connected to the top of the demineralized water tank, and alkali liquor is added in the device, so that carbon dioxide in the demineralized water tank is effectively removed.

Description

Technical Field

[0001] This utility model relates to a decarbonization device for a desalination tank, belonging to the field of carbon removal technology. Background Technology

[0002] Currently, CO2 is present in all water tanks, and the various effects of CO2 are as follows:

[0003] 1. The effect of CO2 on the pH value of demineralized water is as follows:

[0004] CO2 readily dissolves in saturated water. In a liquid saturated water or gaseous inert aqueous solution at room temperature or under very high temperature and pressure, the ratio of the volume of water dissolved in CO2 in the inert gaseous chemical substance to the volume of inert chemical molecules dissolved in water is almost 1. CO2 dissolved in saturated water exists primarily as hydrates or other molecular forms (H2CO3). The ionized H+ ions lower the pH of the water, leading to severe corrosion of steel.

[0005] 2. The effect of CO2 on the conductivity of pure water is as follows:

[0006] When carbon dioxide comes into contact with pure water, it ionizes to produce H+, which in turn increases the conductivity.

[0007] 3. The hazards of CO2 to thermal systems are as follows:

[0008] After the demineralized water enters the thermal system, ammonia can be added to the steam drum to increase the pH value of the boiler feedwater and maintain the pH at 8.8 to 9.3. Within this range, under the action of trace amounts of oxygen in the water, a dense and strongly adhesive protective film will form on the surface of the steam drum and condenser, protecting the pipe walls from corrosion.

[0009] Currently, CO2 removal is achieved through alkaline absorption. This method primarily uses alkaline substances such as liquid alkali to directly absorb carbon dioxide from the air, preventing it from entering the desalination tank along with the air. Common alkaline substances include alkali asbestos and liquid industrial alkali. A container is connected to the vent pipe of the water tank to store the alkali asbestos or liquid industrial alkali. Regular cleaning and replacement are required, and antifreeze measures are necessary in winter. Advantages: Prevents carbon dioxide from entering the water tank. Disadvantages: Requires strict maintenance of the entire water tank for proper operation, resulting in significant maintenance, especially in winter. Sufficient maintenance must be taken into account, considering both heat and freezing. Failure to promptly treat and frequently replace alkaline water and other chemicals can easily cause slight fluctuations in the water quality. Summary of the Invention

[0010] The technical problem this invention aims to solve is: how to reduce the normal operation and maintenance requirements of the demineralized water tank and avoid slight fluctuations in the water quality of the tank.

[0011] To solve the above-mentioned technical problems, the present invention provides a decarbonization device for a demineralized water tank, characterized in that it includes an outer shell, inside which are an upper cavity and a middle cavity. The top of the upper cavity is connected to and connected to a dosing pipe and a breathing pipe. The upper cavity and the middle cavity are connected only through an upper and lower chemical connecting pipe. The middle cavity is connected to the top of the demineralized water tank through a connecting pipe at the top of the demineralized water tank. The bottom of the upper cavity is connected to and connected to the upper end of an upper chemical discharge pipe, which is equipped with an upper chemical discharge valve. The bottom of the middle cavity is connected to and connected to the upper end of a lower chemical discharge pipe, which is equipped with a lower chemical discharge valve.

[0012] Preferably, the top of the upper cavity is further provided with an opening, which is sealed by a sealing plug.

[0013] Preferably, the upper end of the upper and lower layer drug connecting pipe is located above the bottom surface of the upper cavity, and the upper end of the top connecting pipe of the demineralized water tank is located above the bottom surface of the middle cavity.

[0014] Preferably, one end of the dosing pipe is connected to the dosing source, and the other end is connected to the upper cavity; one end of the breathing tube is located outside the outer shell, the upper end of the upper and lower dosing connecting pipe is located in the upper cavity and is higher than the other end of the breathing tube, and the lower end of the upper and lower dosing connecting pipe is located in the middle cavity and is lower than the upper end of the connecting pipe at the top of the demineralized water tank.

[0015] Preferably, the upper end of the top connecting pipe of the demineralized water tank is located in the middle cavity, and the lower end passes through the outer shell and is connected to the top of the demineralized water tank.

[0016] Preferably, the upper drug venting pipe is located directly through the side wall of the outer shell on the outside of the outer shell.

[0017] Preferably, the upper drug venting pipe passes through the middle cavity, then through the side wall of the outer shell, and is located on the outside of the outer shell; the wall of the upper drug venting pipe is sealed to the bottom of the middle cavity.

[0018] Preferably, the outer shell is further provided with a support layer, and the middle part of the top connecting pipe of the demineralized water tank and the middle part of the lower agent drain pipe are both located in the support layer. The lower end of the top connecting pipe of the demineralized water tank and the lower end of the lower agent drain pipe both pass through the side wall of the outer shell and are located on the outside of the outer shell.

[0019] Preferably, one side of the middle cavity is connected to another dosing pipeline, and the connection point between the middle cavity and the dosing pipeline is higher than the upper end of the connecting pipe at the top of the demineralized water tank.

[0020] By connecting this utility model to the top of the demineralized water tank and adding alkaline solution to the device of this utility model, carbon dioxide in the demineralized water tank can be effectively removed, avoiding the impact on the pH value of the demineralized water, the conductivity of the pure water, and the damage to the thermal system. This reduces the normal operation and maintenance requirements of the demineralized water tank and avoids slight fluctuations in the water quality of the tank. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a decarbonization device for a demineralized water tank.

[0022] Wherein: 1 is the sealing plug; 2 is the dosing pipe; 3 is the upper chemical drain pipe; 4 is the top connecting pipe of the demineralized water tank; 5 is the outer shell; 6 is the upper chemical drain valve; 7 is the connecting pipe between the upper and lower chemical layers; 8 is the lower chemical drain pipe; 9 is the lower chemical drain valve; 10 is the breathing tube;

[0023] 51 is the upper cavity; 52 is the middle cavity; 53 is the stent layer. Detailed Implementation

[0024] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] This utility model provides a decarbonization device for a demineralized water tank, such as... Figure 1 As shown, it includes an outer shell 5, inside which are arranged sequentially from top to bottom an upper cavity 51, a middle cavity 52, and a support layer 53. The top of the upper cavity 51 is connected to and connected to the dosing agent pipeline 2 and the breathing tube 10. The top of the upper cavity 51 also has an opening for connecting to the outside atmosphere, and a sealing plug 1 is sealed to the opening. One end of the dosing agent pipeline 2 is connected to the agent source, and the other end is connected to the upper cavity 51. The upper cavity 51 and the middle cavity 52 are connected only through an upper and lower agent connecting pipe 7. The middle cavity 52 is connected to the top of the demineralized water tank through a connecting pipe 4 at the top of the demineralized water tank.

[0027] The upper end of the upper and lower layer chemical connecting pipe 7 is located above the bottom surface of the upper cavity 51, and the upper end of the demineralized water tank top connecting pipe 4 is located above the bottom surface of the middle cavity 52. ​​The bottom surface of the upper cavity 51 is connected to the upper end of the upper chemical drain pipe 3, and an upper chemical drain valve 6 is provided on the upper chemical drain pipe 3 on the outside of the outer shell 5; the bottom surface of the middle cavity 52 is connected to the upper end of the lower chemical drain pipe 8, and a lower chemical drain valve 9 is provided on the lower chemical drain pipe 8 on the outside of the outer shell 5.

[0028] One end of the breathing tube 10 is located outside the outer shell 5, connected to the outside atmosphere. The upper end of the upper and lower drug connecting tube 7 is located inside the upper cavity 51 and is higher than the other end of the breathing tube 10. The lower end of the upper and lower drug connecting tube 7 is located inside the middle cavity 52 and is lower than the upper end of the demineralized water tank top connecting tube 4. The upper end of the demineralized water tank top connecting tube 4 is located inside the middle cavity 52, and the lower end passes through the outer shell 5 and connects to the top of the demineralized water tank.

[0029] The upper-layer drug venting pipe 3 passes directly through the side wall of the outer shell 5 and is located on the outside of the outer shell 5. Alternatively, the upper-layer drug venting pipe 3 passes through the middle cavity 52 (the pipe wall of the upper-layer drug venting pipe 3 is sealed to the bottom of the middle cavity 52, and the interior of the upper-layer drug venting pipe 3 is not connected to the middle cavity 52), and then passes through the side wall of the outer shell 5 and is located on the outside of the outer shell 5.

[0030] The middle part of the top connecting pipe 4 of the demineralized water tank and the middle part of the lower chemical discharge pipe 8 are both located inside the support layer 53. The lower end of the top connecting pipe 4 of the demineralized water tank and the lower end of the lower chemical discharge pipe 8 both pass through the side wall of the outer shell 5 and are located on the outside of the outer shell 5.

[0031] The usage process of this utility model is as follows:

[0032] First, seal all vent pipes to the atmosphere at the top of the demineralized water tanks. Connect the tops of the demineralized water tanks with connecting pipes to add a carbon removal device to the demineralized water tanks of this invention. The device is filled with an alkaline solution. In this embodiment, sodium hydroxide solution is used as the solution to absorb carbon dioxide.

[0033] Close the upper-layer vent valve 6 and the lower-layer vent valve 9. Add 20%-30% sodium hydroxide solution to the upper chamber 51 through the dosing pipe 2. The sodium hydroxide solution overflowing from the upper chamber 51 will then flow through the upper-lower-layer connecting pipe 7 into the middle chamber 52 until the sodium hydroxide solution overflows from the top of the demineralized water tank's top connecting pipe 4 into the demineralized water tank. At this time, the lower end of the breathing tube 10 is immersed in the sodium hydroxide solution in the upper chamber 51, and the lower end of the upper-lower-layer connecting pipe 7 is immersed in the sodium hydroxide solution in the middle chamber 52. This removes carbon dioxide from the water, thereby reducing the influence of air on conductivity.

[0034] When the device of this invention is no longer needed, or when the sodium hydroxide solution after the reaction needs to be replaced, the sodium hydroxide solution in the upper chamber 51 and the middle chamber 52 can be discharged by opening the upper reagent venting valve 6 and the lower reagent venting valve 9.

[0035] The chemical principle used in this invention is as follows:

[0036] When a small amount of liquid carbon dioxide and a small amount of sodium hydroxide directly undergo a carbon-water hydration reaction, a large amount of sodium bicarbonate and some water will be produced. When an excess of liquid carbon dioxide and a small amount of sodium hydroxide are added directly to undergo a carbon-water hydration reaction, a large amount of sodium bicarbonate will be produced.

[0037] Carbon dioxide and metallic sodium hydroxide react directly, which will directly lead to the conversion of nitric acid and sodium hydroxide into new metallic nitrates upon heating. The corresponding metal chemical reaction mechanism equation can be defined as follows: 2NaOH + CO2 = Na2CO3 + H2O.

[0038] When there is too much carbon dioxide in the air, it reacts with sodium hydroxide to produce a substance called sodium bicarbonate.

[0039] 2NaOH+CO2=Na2CO3+H2O; ②Na2CO3+CO2+H2O=2NaHCO3;

[0040] Overall equation: NaOH + CO2 = NaHCO3.

[0041] Excess carbon dioxide reacts with the generated sodium carbonate to form sodium bicarbonate. If the solution becomes saturated, a white substance will appear.

[0042] Example 2

[0043] In this embodiment, one side of the middle cavity 52 is connected to another dosing pipe 2, and the position where the middle cavity 52 is connected to the dosing pipe 2 is higher than the upper end of the top connecting pipe 4 of the demineralized water tank.

[0044] In summary, the alkali tank (i.e., the demineralized water tank and decarbonization device of this utility model) is configured as a complete independent device with a liquid inlet (i.e., dosing agent pipe 2) and a drain outlet (i.e., upper agent drain pipe 3 and lower agent drain pipe 8). The pipes inside the alkali tank are installed as breather pipes (i.e., breathing pipes 10) that allow air intake; various connecting pipes for air distribution; and various balancing breather pipes. The alkali tank has upper and lower layers, both with replenishment pipes (i.e., dosing agent pipes 2). The breathing pipe 10 is located in the upper part of the alkali filter tank, with the other end of the breathing pipe 10 connected to the upper layer of liquid alkali. Each inlet of the breathing pipe 10 extends into the liquid alkali surface, and each pipe that blocks air is also submerged below the liquid alkali surface. Furthermore, each pipe joint that separates it from the air is placed on a pipe open to the atmosphere and interconnected with other pipes equipped with breathers.

[0045] Everything else is the same as in Example 1.

Claims

1. A demineralized water tank carbon removal device, characterized in that, The device includes an outer shell (5), which contains an upper cavity (51) and a middle cavity (52). The top of the upper cavity (51) is connected to and connected to the dosing pipe (2) and the breathing tube (10). The upper cavity (51) and the middle cavity (52) are connected only through an upper and lower dosing connecting pipe (7). The middle cavity (52) is connected to the top of the demineralized water tank through a demineralized water tank top connecting pipe (4). The bottom of the upper cavity (51) is connected to and connected to the upper end of the upper dosing drain pipe (3). The upper dosing drain pipe (3) is equipped with an upper dosing drain valve (6). The bottom of the middle cavity (52) is connected to and connected to the upper end of the lower dosing drain pipe (8). The lower dosing drain pipe (8) is equipped with a lower dosing drain valve (9).

2. The demineralized water tank carbon removal device as described in claim 1, characterized in that, The top of the upper cavity (51) is also provided with an opening, which is sealed by a sealing plug (1).

3. The demineralized water tank carbon removal device as described in claim 1, characterized in that, The upper end of the upper and lower layer drug connecting pipe (7) is located above the bottom surface of the upper cavity (51), and the upper end of the top connecting pipe (4) of the demineralized water tank is located above the bottom surface of the middle cavity (52).

4. The demineralized water tank carbon removal device as described in claim 1, characterized in that, One end of the dosing pipe (2) is connected to the drug source, and the other end is connected to the upper cavity (51); one end of the breathing tube (10) is located outside the outer shell (5), the upper end of the upper and lower drug connecting pipe (7) is located inside the upper cavity (51) and is higher than the other end of the breathing tube (10), and the lower end of the upper and lower drug connecting pipe (7) is located inside the middle cavity (52) and is lower than the upper end of the top connecting pipe (4) of the demineralized water tank.

5. The demineralized water tank carbon removal device as described in claim 1, characterized in that, The upper end of the top connecting pipe (4) of the demineralized water tank is located inside the middle cavity (52), and the lower end passes through the outer shell (5) and is connected to the top of the demineralized water tank.

6. The demineralized water tank carbon removal device as described in claim 1, characterized in that, The upper drug venting pipe (3) passes directly through the side wall of the outer shell (5) and is located on the outside of the outer shell (5).

7. The demineralized water tank carbon removal device as described in claim 1, characterized in that, The upper drug venting pipe (3) passes through the middle cavity (52), then through the side wall of the outer shell (5), and is located on the outside of the outer shell (5); the pipe wall of the upper drug venting pipe (3) is sealed to the bottom of the middle cavity (52).

8. The demineralized water tank carbon removal device as described in claim 1, characterized in that, The outer shell (5) is also provided with a support layer (53). The middle part of the top connecting pipe (4) of the demineralized water tank and the middle part of the lower agent drain pipe (8) are both located in the support layer (53). The lower end of the top connecting pipe (4) of the demineralized water tank and the lower end of the lower agent drain pipe (8) pass through the side wall of the outer shell (5) and are located on the outside of the outer shell (5).

9. The demineralized water tank carbon removal device as described in claim 1, characterized in that, One side of the middle cavity (52) is connected to another dosing pipe (2), and the position where the middle cavity (52) is connected to the dosing pipe (2) is higher than the upper end of the top connecting pipe (4) of the demineralized water tank.

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