Multi-stage combined deoxidation tank

Abstract

The utility model provides a multi-stage combined deoxidation tank. The multi-stage combined deoxidation tank comprises an upper tank body, a middle tank body and a lower tank body which are connected through flanges, a water inlet is formed in the side wall of the upper tank body; an inner cavity of the first-stage deoxidization chamber is a first-stage deoxidization chamber and is sequentially provided with a gas-liquid separation net, an atomizer, a first-stage deoxidization filler layer and a supporting grating plate I from top to bottom; a diversion unit and a porous liquid homogenizing plate are arranged in an inner cavity of the middle tank body; a sewage outlet and a liquid outlet are formed in the bottom of the lower tank body, and a medicament inlet is formed in the side wall; an inner cavity of the secondary deoxidizing chamber is a secondary deoxidizing chamber, and a secondary deoxidizing filler layer, a supporting grating plate II, a temperature control coil pipe and a supporting grating plate III are sequentially arranged in the secondary deoxidizing chamber from top to bottom. According to the multi-stage combined deoxidation tank, a multi-stage combined mode of vacuum deoxidation and chemical deoxidation is adopted, the deoxidation effect is good, the deoxidation efficiency is high, and the medicament consumption is low; the vertical integrated design of the upper, middle and lower tank bodies is adopted, the structure is compact, and the occupied area is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of boiler water deoxygenation technology, and in particular relates to a multi-stage combined deoxygenation tank. Background Technology

[0002] In boiler feedwater treatment processes, dissolved oxygen and other gases need to be removed from the feedwater to prevent corrosion of thermal equipment and pipelines. Common boiler water deoxygenation methods include thermal deoxygenation, vacuum deoxygenation, chemical deoxygenation, rust deoxygenation, and electrochemical deoxygenation. Each method has its own advantages and disadvantages. Single-stage deoxygenation tanks often suffer from low treatment efficiency, high reagent consumption, and poor deoxygenation effects, while multi-stage deoxygenation equipment suffers from unreasonable structural design, large footprint, and complex piping systems. Utility Model Content

[0003] In view of this, in order to solve the above-mentioned technical problems, this utility model proposes a multi-stage combined deoxygenation tank with good deoxygenation effect, high deoxygenation efficiency, low reagent consumption, reasonable structural design and small footprint.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A multi-stage combined deoxygenation tank includes an upper tank, a middle tank, and a lower tank connected in sequence by flanges;

[0006] The top of the upper tank is provided with an exhaust port and a vacuum port, and the side wall is provided with a water inlet; the inner cavity of the upper tank is a primary deoxygenation chamber, and the primary deoxygenation chamber is provided with a gas-liquid separation net, an atomizer connected to the water inlet, a primary deoxygenation packing layer, and a support grid plate supporting the primary deoxygenation packing layer in sequence from top to bottom.

[0007] The inner cavity of the middle tank is provided with a flow guiding unit and a porous liquid equalization plate from top to bottom;

[0008] The bottom of the lower tank is provided with a drain outlet and a liquid outlet, and the side wall is provided with a chemical inlet; the inner cavity of the lower tank is a two-stage deoxygenation chamber; the two-stage deoxygenation chamber is provided in sequence below the chemical inlet, including a two-stage deoxygenation packing layer, a second supporting grid plate supporting the two-stage deoxygenation packing layer, a temperature control coil, and a third supporting grid plate supporting the temperature control coil.

[0009] The primary deoxygenation chamber employs vacuum deoxygenation technology. The vacuum port is connected to an external vacuum device to control the negative pressure environment within the chamber. Water enters through the inlet and is sprayed in via an atomizer, which atomizes the water into 50-100μm droplets, increasing the contact area between the water and the vacuum environment and improving deoxygenation efficiency. The droplets fall onto the primary deoxygenation packing layer, extending the liquid's time in the vacuum environment. This accelerates the escape of dissolved oxygen, removing most of it. The escaped gas is then separated into gas and liquid components. After the water is separated from the net and the carried droplets are removed, the gas is discharged through the exhaust port. After the water has passed through the first stage of deoxygenation, it enters the flow guiding unit and is then evenly distributed by the porous liquid distribution plate to prevent the water flow from directly impacting the second stage deoxygenation packing layer. After the water flows into the second stage deoxygenation packing layer, the chemical reagents introduced through the reagent inlet react with the residual dissolved oxygen in the second stage deoxygenation packing layer to further deoxygenate. The temperature control coil controls the temperature in the second stage deoxygenation chamber to improve the kinetic efficiency of the chemical reaction. After two stages of deoxygenation, the water is finally discharged through the drain port.

[0010] Furthermore, the gas-liquid separation mesh is a conical structure with the cone angle pointing upwards, and its lower edge is connected to the inner wall of the upper tank.

[0011] Furthermore, the atomizer is provided with multiple atomizing nozzles suspended above the primary deoxygenating filler layer.

[0012] Furthermore, the filler in the primary deoxidizing filler layer is a honeycomb ceramic filler.

[0013] The use of honeycomb ceramic filler provides a large specific surface area and high porosity, offering sufficient contact surface in a vacuum environment to accelerate the escape of dissolved oxygen.

[0014] Furthermore, the upper tank is provided with a pressure stabilizing interface on the side wall above the atomizer and the lower tank is provided with a pressure stabilizing interface on the side wall above the drug inlet. The two pressure stabilizing interfaces are connected by a connecting pipe.

[0015] The pressure stabilizing interfaces of the upper and lower tanks are connected by a connecting pipe to ensure pressure balance between the two deoxygenation chambers and prevent excessive pressure difference from affecting the deoxygenation effect.

[0016] Furthermore, the flow guiding unit includes a flow guiding plate and a plurality of vertically penetrating flow guiding cylinders evenly distributed on the flow guiding plate; a plurality of swirling flow guiding vanes are provided at equal intervals along the circumference on the inner wall of the flow guiding cylinder, and the swirling flow guiding vanes extend spirally along the inner wall of the flow guiding cylinder to the bottom.

[0017] The inner wall of the guide tube is equipped with swirling guide vanes, which cause the water flow to form a spiral motion. This generates centrifugal force to accelerate the coalescence and separation of oxygen microbubbles. At the same time, the spiral path increases the fluid travel, ensuring that residual oxygen has sufficient time to escape after vacuum deoxygenation. In addition, it can also avoid the problems of overflow in the central area and dead zones at the edges caused by traditional straight-through guide tubes, ensuring a smooth transition of water flow to the lower tank.

[0018] Furthermore, the porous liquid distribution plates are installed at intervals below the guide tube.

[0019] The porous liquid distribution plate is used to evenly distribute the water flow and prevent the water flow from directly impacting the secondary deoxygenation packing layer.

[0020] Furthermore, the secondary deoxidizing packing layer is filled with ceramic Raschig ring packing.

[0021] The use of ceramic Raschig ring packing provides a large surface area, promoting the full reaction of the reagent with residual oxygen in the water and removing the remaining dissolved oxygen.

[0022] Furthermore, the heat exchange medium inlet and outlet of the temperature control coil are respectively connected to two heat exchange connecting pipes located on the side wall of the lower tank.

[0023] Furthermore, the lower tank body is provided with a circulation inlet on the upper side wall of the secondary deoxygenation packing layer; the lower tank body is provided with a circulation outlet on the upper side wall of the drain port; the inlet end of the circulation inlet and the outlet end of the circulation outlet are connected by a circulation pipe equipped with a circulation pump; a liquid distribution assembly is provided above the secondary deoxygenation packing layer and connected to the outlet end of the circulation inlet, the liquid distribution assembly includes multiple concentric and interconnected annular pipes, and multiple liquid outlet holes are opened on the lower end face of the annular pipes.

[0024] A portion of the effluent is returned to the top of the secondary deoxygenation packing layer via a circulating pump, further improving deoxygenation efficiency, ensuring full contact with the chemicals, and reducing chemical consumption.

[0025] Compared with the prior art, the multi-stage combined deoxygenator of this utility model has the following advantages:

[0026] (1) The multi-stage combined deoxygenation tank of this utility model adopts a multi-stage combination of vacuum deoxygenation and chemical deoxygenation. Vacuum deoxygenation is completed by the upper tank, and most of the dissolved oxygen is efficiently removed by the atomizer and the first-stage deoxygenation packing layer. The middle tank achieves smooth water flow transition and uniform distribution through the flow guiding unit and the porous liquid equalization plate. The lower tank mainly completes chemical deoxygenation, and ensures the complete removal of residual dissolved oxygen through the chemical reaction and the temperature control coil. The deoxygenation effect is good and the efficiency is high.

[0027] (2) The multi-stage combined deoxygenator described in this utility model adopts a vertically integrated design of upper, middle and lower tanks, which reduces the floor space and has a compact structure.

[0028] (3) The multi-stage combined deaerator structure of this utility model is reasonably designed. By setting the guide tube and the pressure stabilizing docking interface, the stable operation can be ensured. By circulating water in and out through the temperature control coil and the circulating pump, the water flow can fully contact the agent, reduce the amount of agent consumed and improve the heat energy utilization rate. Attached Figure Description

[0029] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0030] Figure 1 This is a schematic diagram of the structure of the multi-stage combined deoxygenator described in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1-Upper tank, 2-Middle tank, 3-Lower tank, 4-Exhaust port, 5-Vacuum port, 6-Water inlet, 7-First-stage deoxygenation chamber, 8-Gas-liquid separation net, 9-Atomizer, 10-First-stage deoxygenation packing layer, 11-Supporting grating plate one, 12-Flow guiding unit, 13-Porous liquid distribution plate, 14-Flow guiding plate, 15-Flow guiding cylinder, 16-Swirl guide vane, 17-Sewage outlet, 18-Liquid outlet, 19-Reagent inlet, 20-Second-stage deoxygenation chamber, 21-Second-stage deoxygenation packing layer, 22-Supporting grating plate two, 23-Temperature control coil, 24-Supporting grating plate three, 25-Heat exchange connecting pipe, 26-Circulation inlet, 27-Circulation outlet, 28-Circulation pump, 29-Circulation pipeline, 30-Liquid distribution component, 31-Pressure stabilizing connecting port, 32-Connecting pipe. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] like Figure 1 As shown, a multi-stage combined deoxygenation tank includes an upper tank 1, a middle tank 2, and a lower tank 3 connected in sequence by flanges;

[0038] The top of the upper tank 1 is provided with an exhaust port 4 and a vacuum port 5, and the side wall is provided with a water inlet 6; the inner cavity of the upper tank 1 is a primary deoxygenation chamber 7, and the primary deoxygenation chamber 7 is provided with a gas-liquid separation net 8, an atomizer 9 connected to the water inlet, a primary deoxygenation packing layer 10, and a support grid plate 11 supporting the primary deoxygenation packing layer 10 in sequence from top to bottom; the gas-liquid separation net 8 is a conical structure with the cone angle pointing upwards, and its lower edge is connected to the inner wall of the upper tank 1; the atomizer 9 is provided with multiple atomizing nozzles suspended above the primary deoxygenation packing layer 10; the packing of the primary deoxygenation packing layer 10 is honeycomb ceramic packing;

[0039] The inner cavity of the intermediate tank 2 is provided with a flow guiding unit 12 and a porous liquid equalization plate 13 from top to bottom. The flow guiding unit 12 includes a flow guiding plate 14 and a plurality of vertically penetrating flow guiding cylinders 15 evenly distributed on the flow guiding plate 14. A plurality of swirling flow guiding vanes 16 are provided at equal intervals along the circumference on the inner wall of the flow guiding cylinder 15. The swirling flow guiding vanes 16 extend spirally along the inner wall of the flow guiding cylinder 15 to the bottom. The porous liquid equalization plate 13 is installed at intervals below the flow guiding cylinder 15.

[0040] The bottom of the lower tank 3 is provided with a drain outlet 17 and a liquid outlet 18, and the side wall is provided with a reagent inlet 19; the inner cavity of the lower tank 3 is a secondary deoxygenation chamber 20; inside the secondary deoxygenation chamber 20, below the reagent inlet 19, there are arranged in sequence a secondary deoxygenation packing layer 21, a second supporting grid plate 22 supporting the secondary deoxygenation packing layer 21, a temperature control coil 23, and a third supporting grid plate 24 supporting the temperature control coil 23; the packing of the secondary deoxygenation packing layer 21 is ceramic Raschig ring packing; the heat exchange medium inlet and heat exchange medium outlet of the temperature control coil 23 are respectively connected to two heat exchange connecting pipes 25 provided on the side wall of the lower tank 3; the lower tank 3 is provided with a circulation channel on the side wall above the secondary deoxygenation packing layer 21. The lower tank 3 has a circulation outlet 27 located on the side wall above the drain port 18. The inlet end of the circulation inlet 26 and the outlet end of the circulation outlet 27 are connected by a circulation pipe 29 equipped with a circulation pump 28. A liquid distribution assembly 30 connected to the outlet end of the circulation inlet 26 is provided above the secondary deoxygenation packing layer 21. The liquid distribution assembly 30 includes multiple concentric and interconnected annular pipes, and multiple liquid outlet holes are opened on the lower end face of the annular pipes. A pressure stabilizing interface 31 is provided on the side wall above the atomizer 9 of the upper tank 1 and on the side wall above the agent inlet 19 of the lower tank 3. The two pressure stabilizing interfaces 31 are connected by a connecting pipe 32.

[0041] The working process of the multi-stage combined deoxygenator described in this utility model is as follows:

[0042] The water to be treated enters through the inlet 6 on the side wall of the upper tank 1 and connects to the atomizer 9. The atomizer 9 is equipped with multiple atomizing nozzles to atomize the water flow into fine droplets, which are then evenly sprayed into the primary deoxygenation chamber 7. Under vacuum conditions (the pressure is maintained at -0.08 to -0.095 MPa through the vacuum port 5), dissolved oxygen is rapidly released. The water flow passes through the honeycomb ceramic packing layer 10, which accelerates the aggregation and separation of oxygen microbubbles. The released oxygen is discharged through the exhaust port 4, and the deoxygenated water flows through the supporting grid plate 11 and enters the middle tank 2. The water flow enters the flow guiding unit 12 of the middle tank 2 and, through the swirling guide vanes 16 set on the inner wall of the flow guiding cylinder 15, causes the water flow to form a spiral motion. The swirling action further separates residual oxygen and ensures a smooth transition of the water flow to the lower tank 3. The water flow passes through a porous uniform... Liquid plate 13 evenly distributes the water into the secondary deoxygenation chamber 20, preventing the water flow from directly impacting the secondary deoxygenation packing layer 21. Water enters the secondary deoxygenation chamber 20, where chemical agents (such as sodium sulfite or hydrazine) are added through agent inlet 19, reacting with residual dissolved oxygen in the water. The water flows through the ceramic Raschig ring packing layer 21, where the packing provides a large surface area, promoting a full reaction between the agent and oxygen, further removing residual oxygen. Temperature control coil 23 maintains the water temperature through the heat exchange medium, improving the kinetic efficiency of the chemical reaction. Part of the effluent is returned from circulation outlet 27 to circulation inlet 26 via circulation pump 28, and then evenly distributed above the secondary deoxygenation packing layer 21 through liquid distribution component 30, further improving deoxygenation efficiency and reducing agent consumption. The deoxygenated water is discharged through drain outlet 18 and enters the boiler feedwater system.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 multi-stage combined deoxidation tank characterized by: The upper tank body, the middle tank body and the lower tank body are sequentially connected through flanges; The top of the upper tank body is provided with an exhaust port and a vacuumizing port, and the side wall is provided with a water inlet; the inner cavity of the upper tank body is a primary deoxidizing chamber, and the primary deoxidizing chamber is sequentially provided, from top to bottom, with a gas-liquid separation net, an atomizer connected with the water inlet, a primary deoxidizing filler layer, and a support grid plate one supporting the primary deoxidizing filler layer; The inner cavity of the middle tank body is sequentially provided, from top to bottom, with a flow guide unit and a porous liquid distribution plate; The bottom of the lower tank body is provided with a blowdown port and a liquid outlet, and the side wall is provided with a medicament inlet; the inner cavity of the lower tank body is a secondary deoxidizing chamber; the secondary deoxidizing chamber is sequentially provided, below the medicament inlet, with a secondary deoxidizing filler layer, a support grid plate two supporting the secondary deoxidizing filler layer, a temperature control coil, and a support grid plate three supporting the temperature control coil.

2. The multi-stage combined deoxidation tank according to claim 1, characterized by: The gas-liquid separation net is a conical structure with a cone angle upward, and the lower edge is connected with the inner wall of the upper tank body.

3. The multi-stage combined deoxidation tank according to claim 1, characterized by: The atomizer is provided with a plurality of atomizing nozzles suspended above the primary deoxidizing filler layer.

4. The multi-stage combined deoxidation tank according to claim 1, characterized by: The filler of the primary deoxidizing filler layer is a honeycomb ceramic filler.

5. The multi-stage combined deoxidation tank of claim 1, wherein: The side wall of the upper tank body above the atomizer and the side wall of the lower tank body above the medicament inlet are both provided with a stable pressure butt joint, and the two stable pressure butt joints are communicated through a connecting pipe.

6. The multi-stage combined deoxidation tank of claim 1, wherein: The flow guide unit comprises a flow guide plate and a plurality of flow guide cylinders uniformly distributed on the flow guide plate; a plurality of cyclone guide vanes are equidistantly arranged on the inner wall of the flow guide cylinder in the circumferential direction, and the cyclone guide vanes extend helically along the inner wall of the flow guide cylinder to the bottom.

7. The multi-stage combined deoxidation tank according to claim 6, characterized by: The porous liquid distribution plate is installed below the flow guide cylinder.

8. The multi-stage combined deoxidation tank of claim 1, wherein: The filler of the secondary deoxidizing filler layer is a ceramic Rasching ring filler.

9. The multi-stage combined deoxidation tank of claim 1, wherein: The heat exchange medium inlet and the heat exchange medium outlet of the temperature control coil are respectively connected with two heat exchange butt joints provided on the side wall of the lower tank body.

10. The multi-stage combined deoxidation tank of claim 1, wherein: The lower tank body is provided with a circulation inlet at the side wall above the secondary deoxidizing filler layer, and is provided with a circulation outlet at the side wall above the liquid outlet; the inlet end of the circulation inlet and the outlet end of the circulation outlet are connected through a circulation pipeline provided with a circulation pump; the upper side of the secondary deoxidizing filler layer is provided with a liquid distribution assembly connected with the outlet end of the circulation inlet, and the liquid distribution assembly comprises a plurality of concentric ring pipes which are connected with each other, and a plurality of liquid outlet holes are formed in the lower end surface of the ring pipe.

Images