Low-elevation vacuum desorption deaerator

Abstract

The utility model discloses a low-elevation vacuum desorption deaerator, and relates to the technical field of deoxidation equipment, the low-elevation vacuum desorption deaerator comprises a gas-water separator, the gas-water separator is connected with a water-ring vacuum pump, and the first-stage deaeration adopts an independent vacuum deaeration mode. The external vacuum pump only sucks the oxygen-containing gas desorbed from the vacuum tank and does not sucks the oxygen-containing gas in the rear desorption tank, so that the vacuum tank is ensured to be in an ultimate vacuum state, and in the second stage, pure desorption deoxygenation is adopted. Water subjected to first-stage deoxygenization is fed into a desorption tank through a water diversion system composed of a water diversion pump, a water diversion ejector, an auxiliary pipeline and a valve, it is guaranteed that the desorption tank is in a normal pressure state, a reactant is not purely placed in a reactor, and a three-way catalytic device is placed on the upper portion of the reactant, so that oxygen-containing gas reacts with reactant activated carbon, and the oxygen-containing gas is separated from the desorption tank. A small amount of carbon monoxide generated due to the existence of a high-temperature section is converted into carbon dioxide, so that the oxyphilicity of the mixed gas in water is improved.

Description

Technical Field

[0001] This invention relates to the field of deoxygenation equipment technology, specifically a low-standard high-vacuum desorption deoxygenator. Background Technology

[0002] As a boiler's ambient temperature deaerator, chemical deaerators, vacuum deaerators, sponge iron deaerators, vacuum electrochemical-chemical three-in-one deaerators, and vacuum desorption-electrochemical three-in-one series deaerators have been commonly used. In recent years, vacuum electrochemical-chemical three-in-one deaerators or vacuum desorption-electrochemical three-in-one series deaerators have been the main types. However, vacuum electrochemical-chemical three-in-one deaerators have two insurmountable drawbacks. First, although some deoxygenated water flows back from the priming pump in the vacuum breaking device, the backflow water cannot offset the vacuum level inside the vacuum tank. Therefore, it is still impossible to overcome the phenomenon that the priming pump cannot draw water under high vacuum, leading to the problem of the priming pump failing to supply water under high vacuum conditions. Therefore, in order to avoid frequent water supply interruptions, equipment manufacturers have adopted electrical control measures to maintain the equipment at a relatively low vacuum level of -0.05 to -0.06 MPa. However, deoxygenation is incomplete when the equipment operates at a low vacuum level, thus failing to fully utilize the vacuum deoxygenation effect. This results in poor performance of the first-stage vacuum deoxygenation, increasing the burden on the second-stage deoxygenation element, namely electrochemical deoxygenation. Consequently, the electrolysis energy needs to be increased. Due to the increased electrolysis energy, a large amount of ferrous ions (Fe2+) are ionized at the anode plate. After reacting with residual oxygen, ferric ions (Fe3+) in the water eventually exceed the standard. Although the equipment manufacturer has implemented iron removal devices, practice has shown that the iron content in the boiler water often exceeds the standard. The disadvantages of this deoxygenation equipment are: 1. Due to the constant adjustment of the vacuum level (air needs to be added to the equipment by opening the vacuum breaking valve when the vacuum level is higher than the set value), the deoxygenation effect is unstable; 2. Because the high vacuum deoxygenation effect cannot be fully utilized, the electrolysis stage consumes a large amount of energy and is very likely to cause the iron ion content in the water supply to exceed the standard.

[0003] For the vacuum-electrochemical three-in-one series deaerator, which is not yet widely used, compared with the aforementioned vacuum-electrochemical three-in-one deaerator, the following disadvantages exist: 1. Because all the oxygen-containing gas extracted in the first-stage vacuum deaeration stage is sent to a subsequent heater to react with the reactant (activated carbon or anthracite), the consumption of reactant is excessive, resulting in excessive energy loss for the reaction. Therefore, this deaerator has the following drawbacks: 1. Since all the oxygen-containing gas is sent to the heater for reaction with the deaerator, the consumption of deaerator is excessive, increasing operating costs and accelerating the frequency of deaerator addition, which brings challenges to operation. 1. Inconvenience; 2. Since all oxygen-containing gas is processed in the heater, the heater requires more electrical energy. Therefore, this type of deoxygenation equipment consumes more electrical energy than the above-mentioned vacuum electrochemical chemical three-in-one deoxygenator. Excessive electrical energy consumption does not meet the requirements of energy saving. 3. Since each container of this type of deoxygenator is in a vacuum state, and the last vacuum container is led out by the water pump, it is still in low vacuum operation in order to ensure that the water pump can pump water normally. As a result, the vacuum deoxygenation effect is not fully utilized, and the first-stage deoxygenation effect is not high. It relies on the second-stage electrolytic deoxygenation. This still results in high electrical energy consumption and the problem of excessive ferric ions (Fe3+) in the produced water. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a low-standard high-vacuum desorption deoxygenator, which solves the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a low-level high-vacuum desorption deaerator, comprising a gas-liquid separator, a water ring vacuum pump connected to the gas-liquid separator, a vacuum degassing tower connected to the output end of the water ring vacuum pump, a water jet ejector connected to the vacuum degassing tower, a water jet pump connected to one side of the water jet ejector, a water jet pump connected to one side of the water jet pump, a gas-liquid mixer connected to the lower end of the water jet pump, a desorption tower connected to the gas-liquid mixer, a water supply pump connected to one side of the desorption tower, a gas heat exchanger connected to one side of the water jet pump, a steam-liquid separator connected to the upper end of the desorption tower, a water seal connected to the lower end of the steam-liquid separator, the steam-liquid separator connected to the gas heat exchanger, and a gas reactor connected to one side of the gas heat exchanger.

[0006] Preferably, the vacuum degassing tower is provided with a softened water inlet on one side, and the vacuum degassing tower is provided with a deoxygenation spray device, which is located on the side of the softened water inlet.

[0007] Preferably, the vacuum degassing tower is equipped with deep deoxygenation packing material located inside and below the deoxygenation spray device.

[0008] Preferably, the analytical tower is equipped with a water distribution perforated plate.

[0009] Preferably, the gas reactor is equipped with an electric heating tube at its upper end.

[0010] Preferably, a ternary catalyst and an activated carbon reactant are arranged sequentially from top to bottom inside the gas reactor and below the electric heating tube. Beneficial effects

[0011] This invention provides a low-profile, high-vacuum desorption deaerator, adaptable to installation spaces of varying heights. Traditional desorption deaerators are limited in installation height by the height of the deoxygenated water tank, requiring the desorption tower height to be at least 1 meter higher than the top of the outlet water tank. Since deoxygenated water tanks are typically over 4 meters high, the desorption tower height is generally required to be no less than 5 meters. This height limitation prevents some users from transporting or assembling the deaerator due to insufficient workshop height or inability to enter vertically through workshop doors. The height of each tank in this patented deaerator can be adjusted according to the user's workshop space, generally not exceeding 3.5 meters, facilitating long-distance equipment transportation, modular manufacturing, and rapid on-site installation.

[0012] Significant savings in electricity and materials are achieved. This is mainly reflected in: 1. The elimination of an electrolytic deoxygenation device as a secondary deoxygenation stage, thus saving the electricity consumed in electrolysis; 2. The introduction of only about 10% oxygen-containing gas into the heater significantly reduces the cost of electricity and reactant (such as activated carbon) materials used in the heating chamber, thereby substantially reducing energy consumption in both aspects. The energy consumption of the deoxygenator in this patent application is approximately 70% of that of a vacuum electrochemical three-in-one deoxygenator and approximately 55% of that of a vacuum analytical electrochemical three-in-one series deoxygenator.

[0013] The deoxygenation effect is stable and further improved. In the first-stage deoxygenation stage, vacuum deoxygenation is implemented alone, with the vacuum tank operating at an extreme high vacuum, overcoming the drawbacks of incomplete deoxygenation due to low influent temperature and low vacuum. This allows 95% of the oxygen to be removed at this stage. The remaining 5% of the water is diverted to the desorption tank, where approximately 5% of the oxygen-containing gas is transported to the reactor through desorption. Only this 5% of oxygen-containing gas reacts with the reactant. Due to the reduced workload of the reactor, it is beneficial to completely remove the residual oxygen in the mixed gas, resulting in a significant improvement in the deoxygenation effect. This ensures that the deoxygenation effect is maintained at 0.01-0.05 mg / L, which is significantly better than the 0.05-0.1 mg / L effect maintained by other current deaerators.

[0014] The produced water does not have excessive iron ion levels. This is because this equipment does not have an electrochemical deoxygenation device, and therefore there is no issue of iron ion generation from the electrolytic anode plate.

[0015] Transportation and installation are convenient. All machinery, tanks, pipes, and components are assembled as a set on a steel base frame, and transportation does not exceed the limits; on-site, only the power control box and the inlet and outlet of the water need to be connected for commissioning and operation, saving labor and time.

[0016] The first stage of deoxygenation employs a separate vacuum deoxygenation method. The external vacuum pump only draws in the oxygen-containing gas desorbed from this vacuum tank, without drawing in the oxygen-containing gas from the subsequent desorption tank, ensuring that the vacuum tank is in a state of ultimate vacuum.

[0017] The second stage of deoxygenation employs simple desorption. The water deoxygenated in the first stage is fed into the desorption tank through a priming system consisting of a priming pump, a priming ejector, and auxiliary pipes and valves, ensuring that the desorption tank is under normal pressure.

[0018] Instead of simply placing the reactant inside the reactor, a three-way catalytic device is placed above the reactant. This allows a small amount of carbon monoxide produced during the reaction of oxygen-containing gas with the activated carbon reactant to be converted into carbon dioxide due to the presence of a high-temperature zone, thereby increasing the oxygen affinity of the mixed gas in water. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a low-standard high-vacuum desorption deaerator according to the present invention.

[0020] In the diagram: 1. Gas-liquid separator; 2. Water ring vacuum pump; 3. Vacuum degassing tower; 4. Water jet ejector; 5. Water pump; 6. Water supply pump; 7. Desorption tower; 8. Gas-liquid separator; 9. Water seal; 10. Gas heat exchanger; 11. Gas reactor; 12. Gas-liquid mixer; 13. Water jet ejector; 14. Softened water inlet; 15. Deoxygenation spray device; 16. Deep deoxygenation packing; 17. Water distribution orifice plate; 18. Electric heating tube; 19. Three-way catalyst; 20. Activated carbon reactant. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1This invention provides a technical solution: a low-standard high-vacuum desorption deaerator, comprising a gas-liquid separator 1, a water ring vacuum pump 2 connected to the gas-liquid separator 1, a vacuum degassing tower 3 connected to the output end of the water ring vacuum pump 2, a water jet ejector 4 connected to the vacuum degassing tower 3, a water jet ejector 5 connected to one side of the water jet ejector 4, a water jet pump 13 connected to one side of the water jet pump 5, a gas-liquid mixer 12 connected to the lower end of the water jet pump 13, a desorption tower 7 connected to the gas-liquid mixer 12, a water supply pump 6 connected to one side of the desorption tower 7, a gas heat exchanger 10 connected to one side of the water jet pump 13, a steam-liquid separator 8 connected to the upper end of the desorption tower 7, a water seal 9 connected to the lower end of the steam-liquid separator 8, the steam-liquid separator 8 connected to the gas heat exchanger 10, and a gas reactor 11 connected to one side of the gas heat exchanger 10.

[0023] In this embodiment, the vacuum degassing tower 3 is further configured such that a softened water inlet 14 is provided on one side, and a deoxygenation spray device 15 is provided inside the vacuum degassing tower 3, with the deoxygenation spray device 15 located on one side of the softened water inlet 14.

[0024] In this embodiment, a deep deoxygenation packing 16 is provided inside the vacuum degassing tower 3 and below the deoxygenation spray device 15.

[0025] In this embodiment, the analytical tower 7 is further configured to have a water distribution perforated plate 17.

[0026] In this embodiment, the upper end of the gas reactor 11 is provided with an electric heating tube 18.

[0027] In this embodiment, a ternary catalyst 19 and an activated carbon reactant 20 are arranged sequentially from top to bottom inside the gas reactor 11 and below the electric heating tube 18.

[0028] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0029] Example: As shown in the attached drawings, softened water enters the deoxygenation spray device 15 inside the vacuum degassing tower 3 through the softened water inlet 14 on the upper side, and then falls downward into the deep deoxygenation packing 16 for deep deoxygenation. The deoxygenated water then falls to the bottom of the vacuum degassing tower 3 for storage, completing the first stage of deoxygenation. To ensure sufficient vacuum within the vacuum degassing tower 3, a water ring vacuum pump 2 is installed outside the vacuum degassing tower 3. The water ring vacuum pump 2 extracts oxygen-containing gas from the vacuum degassing tower 3, and the extracted oxygen-containing gas is discharged into the gas-water separator 1. A water pump 5 and a water jet ejector 4 form a water-drawing device, drawing out the water stored at the bottom of the vacuum degassing tower 3. This water is then transported to the bottom of the desorption tower 7 via the water jet ejector 13 and the gas-water mixer 12. Because the oxygen-containing water transported from the bottom of the vacuum degassing tower 3 has an affinity for the oxygen-deficient gas in the gas-water mixer 12, the oxygen-deficient gas in the desorption tower 7 carries the oxygen upward during its upward flow. The residual oxygen in the water detaches from the water layer and enters the upper gas space. Due to the ejection effect of the water jet ejector 13, the oxygen-containing gas in the upper space of the desorption tower 7 flows from the top of the desorption tower 7 through the steam-water separator 8 and enters the gas heat exchanger 10 for heating. Then it enters the gas reactor 11. During the ascent, the oxygen-containing gas reacts with the activated carbon reactant 20, and the oxygen is converted into carbon dioxide (CO2). As the gas continues to rise and flows through the three-way catalyst 19, the carbon monoxide (CO) generated by the high temperature during the gas reaction is completely converted into carbon dioxide (CO2) to ensure the oxygen affinity of the oxygen-free gas in the water. After the oxygen-free gas flows from the top of the gas reactor 11 through the gas heat exchanger 10 and is cooled, it is drawn in by the water jet ejector 13 and mixed with the deoxygenated but residual oxygen-containing water delivered by the water pump 5. Then it is sent to the desorption tower 7 for secondary deoxygenation. This cycle is repeated until the final deoxygenation is achieved.

[0030] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A low-standard high-vacuum desorption deaerator, comprising a gas-liquid separator (1), characterized in that, A water ring vacuum pump (2) is connected to the gas-water separator (1). The output end of the water ring vacuum pump (2) is connected to a vacuum degassing tower (3). A water jet ejector (4) is connected to the vacuum degassing tower (3). A water jet ejector (5) is connected to one side of the water jet ejector (4). A water jet pump (13) is connected to one side of the water jet pump (5). A gas-water mixer (12) is connected to the lower end of the water jet pump (13). (12) A desorption tower (7) is connected, a water supply pump (6) is connected to one side of the desorption tower (7), a gas heat exchanger (10) is connected to one side of the water jet pump (13), a steam-water separator (8) is connected to the upper end of the desorption tower (7), a water seal (9) is connected to the lower end of the steam-water separator (8), the steam-water separator (8) is connected to the gas heat exchanger (10), and a gas reactor (11) is connected to one side of the gas heat exchanger (10).

2. The low-standard high-vacuum desorption deaerator according to claim 1, characterized in that... The vacuum degassing tower (3) is provided with a softened water inlet (14) on one side, and a deoxygenation spray device (15) is provided inside the vacuum degassing tower (3), which is located on the side of the softened water inlet (14).

3. A low-standard high-vacuum desorption deaerator according to claim 2, characterized in that... The vacuum degassing tower (3) is equipped with a deep deoxygenation packing (16) located inside and below the deoxygenation spray device (15).

4. A low-standard high-vacuum desorption deaerator according to claim 1, characterized in that... The analytical tower (7) is equipped with a water distribution perforated plate (17).

5. A low-standard high-vacuum desorption deaerator according to claim 1, characterized in that... An electric heating tube (18) is provided at the upper end of the gas reactor (11).

6. A low-standard high-vacuum desorption deaerator according to claim 5, characterized in that... The gas reactor (11) is provided with a three-way catalyst (19) and an activated carbon reactant (20) arranged from top to bottom below the electric heating tube (18).

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