Three-dimensional air distribution device for waste water spouted bed

Abstract

The utility model discloses a three-dimensional air distribution device for a waste water spouted bed, which comprises a bottom air distribution plate, a side air distribution plate, a lower air chamber, a side air chamber, a screening pipe, a fixed flange, a hot air expansion joint and the like which are connected into a whole. The bottom air distribution plate is provided with a directional air cap or provided with air distribution holes, the bottom air distribution plate comprises a high-density hole area and a low-density hole area from inside to outside, and the side air distribution plate is provided with side air distribution holes. A screening pipe is installed in the center of the bottom air distribution plate, a discharging pipe is led out from a bottom plate or the side wall of the lower air chamber, and a discharging valve is installed on the discharging pipe. And a fixed flange is welded on the shell on the outer side of the air chamber and is connected and fixed with the fluidization bin through bolts. The utility model has the advantages that the three-dimensional air distribution is realized, the fluidization effect is good, the flow field is stable, and the anti-interference capability is strong; cakes in bed materials can be discharged under the condition of no shutdown; all the parts form an integral structural component which is mounted at the lower interface of the fluidization bin through the fixing flange, so that the assembly and disassembly are easy, and the maintenance and replacement are convenient.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology for zero wastewater discharge, specifically a three-dimensional air distribution device for a wastewater spray drying bed. Background Technology

[0002] Some industrial processes discharge saline industrial wastewater, such as desulfurization wastewater from thermal power plants, which contains tens of thousands or even hundreds of thousands of mg / L of salt. Discharging this saline wastewater into natural water bodies pollutes the aquatic environment. To prevent environmental pollution, it is necessary to separate the salt from the wastewater. Wastewater spray drying beds are a typical piece of equipment used in this process, and the air distribution device is a key component. Traditional air distribution devices often use flat air distribution plates, resulting in weak internal circulation power. Saline wastewater is prone to clumping during the drying process, leading to "bed collapse" and requiring shutdown for maintenance. The industry urgently needs an air distribution device with good fluidization effect and stable flow field operation, capable of removing clumps even when occasional clumping occurs without shutdown, thus preventing "bed collapse" and ensuring continuous operation of the spray drying bed. Utility Model Content

[0003] The present invention aims to provide a device that can solve the above problems, specifically a three-dimensional air distribution device for a wastewater jet dryer. The wastewater jet dryer using this air distribution device has a stable flow field and strong anti-interference ability. If agglomeration occurs, the agglomeration can be discharged without stopping the machine, and the jet dryer can operate continuously and stably.

[0004] To achieve the above objectives, the present invention provides the following specific technical solution: a three-dimensional air distribution device for a wastewater spray bed, characterized in that: it includes a bottom air distribution plate (1), a side air distribution plate (4), a lower air chamber (17), a side air chamber (18), a screen pipe (7), a discharge pipe (8), a fixed flange (13), and a hot air expansion joint (15), and the above parts are connected to form an integral component. The bottom air distribution plate (1) distributes air by installing a directional air cap (2) or by directly opening air distribution holes. The outlet air direction of the directional air cap (2) points to the center discharge hole (3) of the bottom air distribution plate (1). The air distribution holes are divided into two density areas, which are high-density hole area and low-density hole area from the inside to the outside. Side air distribution holes are opened on the side air distribution plate (4).

[0005] Optionally, a discharge hole (3) is opened at the center of the bottom air distribution plate (1), a screen pipe (7) is connected below the discharge hole (3), the screen pipe (7) is connected to the discharge pipe (8), the discharge pipe (8) passes through the bottom plate (12) or side wall of the lower air chamber (17) to reach the outside of the lower air chamber (17), and is connected to a discharge valve (9) and a discharge port (10).

[0006] Optionally, the diameter of the screen pipe (7) is 100-150mm and the length is 40-80mm. The side wall of the screen pipe (7) has air distribution holes. The hot air in the lower air chamber (17) can pass through the air distribution holes on the side wall of the screen pipe (7) and enter the screen pipe (7) and enter the fluidization chamber (19) upward.

[0007] Optionally, the top plate (5) of the side air chamber (18) is an inclined wall with an angle of 30-45° to the horizontal plane; the outer wall plate (6) of the side air chamber (18) is a vertical wall.

[0008] Optionally, the fixed flange (13) and the wastewater spray bed fluidization chamber (19) are connected and fixed by bolts (14).

[0009] Optionally, the hot air expansion joint (15) is connected to the lower air chamber (17) and the air supply duct (16) via a flange connection.

[0010] Optionally, the lower air chamber (17) can adopt a side air intake method or a bottom air intake method. The lower air chamber outer wall panel (11) is a vertical wall or an inclined wall. When the bottom air intake method is adopted and the lower air chamber outer wall panel (11) is an inclined wall, the included angle between the two walls is no more than 20°.

[0011] Optionally, when the lower air chamber (17) adopts the bottom air intake method, the discharge pipe (8) passes through the side wall of the lower air chamber (17) to reach the outside of the lower air chamber (17), and an inner bend (21) and an outer bend (22) need to be added. The bending angle of the inner bend (21) and the outer bend (22) is 30-45°.

[0012] Optionally, when the lower air chamber (17) adopts a bottom air intake method, the axial length of the hot air expansion joint (15) is greater than the height of the outer wall panel (6) of the side air chamber.

[0013] The advantages and outstanding effects of this utility model include: 1. The three-dimensional combination of the bottom air distribution plate and the side air distribution plate forms a three-dimensional internal circulation flow field within the fluidization chamber, resulting in good fluidization effect, strong flow field stability, and strong resistance to changes in air volume, air pressure, and wastewater flow rate. 2. Online discharge: By setting a discharge pipe at the center of the bottom air distribution plate, the non-fluidized clumps formed by salt and bed material particles can be discharged when the wastewater drying bed is in operation. 3. Modular structure: All parts are assembled into an integral structural component, installed at the lower interface of the fluidization chamber via a fixed flange, facilitating disassembly and assembly, shortening replacement time, and improving maintenance efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a side-inlet three-dimensional air distribution device for a wastewater spray drying bed, which relates to this utility model.

[0015] Figure 2 This is a top view of a rectangular air distribution plate hood for a wastewater spray drying bed, which is related to this utility model.

[0016] Figure 3 This is a schematic diagram of a bottom-inlet three-dimensional air distribution device for a wastewater spray drying bed, which relates to this utility model.

[0017] Figure 4 This is a top view of the air distribution holes of a circular air distribution plate for a wastewater spray drying bed, which is related to this utility model.

[0018] In the diagram: 1-Bottom air distribution plate; 2-Directional air cap; 3-Discharge hole; 4-Side air distribution plate; 5-Side air chamber top plate; 6-Side air chamber outer wall plate; 7-Screening pipe; 8-Discharge pipe; 9-Discharge valve; 10-Discharge port; 11-Lower air chamber outer wall plate; 12-Lower air chamber bottom plate; 13-Fixed flange; 14-Flange connection bolt; 15-Hot air expansion joint; 16-Air supply duct; 17-Lower air chamber; 18-Side air chamber; 19-Fluidized bed fluidization chamber; 20-Inert bed material particles; 21-Inner elbow; 22-Outer elbow. Detailed Implementation

[0019] The specific implementation methods and working process of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0020] The directional terms such as above, below, left, right, front, and back used in this application are based on the positional relationships shown in the attached drawings. Different attached drawings may result in different positional relationships, therefore they should not be interpreted as limitations on the scope of protection.

[0021] The saline wastewater from thermal power plants includes wet desulfurization wastewater, circulating cooling water concentration wastewater, and acid-base neutralization wastewater from chemical workshops. The salt content in the wastewater ranges from tens of thousands to hundreds of thousands of mg / L, and during the drying process, the salt will only crystallize into solids and precipitate out; its chemical components will not decompose due to heat.

[0022] Example 1: A three-dimensional air distribution device using a side-inlet air intake method

[0023] A certain project selected a hot air jet bed as the process equipment for drying and crystallizing saline wastewater. The hot air jet bed uses inert bed material particles (20). In order to ensure the safe and reliable operation of the hot air jet bed, the three-dimensional air distribution device provided by this utility model is selected. Once agglomeration occurs, the agglomerates can be discharged online.

[0024] like Figure 1 and Figure 2As shown, the fluidization chamber of the hot air jet dryer in this embodiment is an inverted truncated quadrangular shape, equipped with a three-dimensional air distribution device with a rectangular cross-section. According to the technical principle of this utility model, a three-dimensional air distribution device is configured for the hot air jet dryer of this project, including a bottom air distribution plate (1), a side air distribution plate (4), a lower air chamber (17), a side air chamber (18), a screen pipe (7), a discharge pipe (8), a fixed flange (13), a hot air expansion joint (15), and other parts, which are connected into an integral component. The bottom air distribution plate (1) distributes air by installing a directional air cap (2), and the outlet air direction of the directional air cap (2) points to the center discharge hole (3) of the bottom air distribution plate (1).

[0025] Furthermore, such as Figure 1 As shown, the three-dimensional air distribution device configured in this embodiment adopts a side air intake method. The air inlet of the lower air chamber (17) is on the left side and is connected to a hot air expansion joint (15) and an air supply duct (16).

[0026] Furthermore, a discharge hole (3) is opened at the center of the bottom air distribution plate (1), and a screen pipe (7) is connected below the discharge hole (3). The diameter of the screen pipe (7) is 100-150mm, and 125mm is selected in this embodiment. The length is 40-80mm, and 50mm is selected in this embodiment. The side wall of the screen pipe (7) has an air distribution hole. The hot air in the lower air chamber (17) can pass through the air distribution hole on the side wall of the screen pipe (7) and enter the screen pipe (7) and enter the fluidization chamber (19) upward.

[0027] Furthermore, the screening pipe (7) is connected to the discharge pipe (8), which passes through the bottom plate (12) of the lower air chamber (17) to reach the outside of the lower air chamber (17) and is connected to the discharge valve (9) and the discharge port (10).

[0028] Furthermore, the top plate (5) of the side air chamber (18) is an inclined wall with an angle of 30-45° to the horizontal plane, and 30° is selected in this embodiment; the outer wall plate (6) of the side air chamber (18) is a vertical wall.

[0029] Furthermore, the fixed flange (13) and the wastewater spray fluidized bed chamber (19) are connected and fixed by bolts (14).

[0030] This embodiment is used as follows:

[0031] like Figure 1 As shown, the drying heat source of the hot air jet bed is hot air at 300°C. The hot air is delivered to the lower air chamber (17) of this three-dimensional air distribution device through the air supply pipe (16). The lower air chamber (17) is connected to the side air chamber (18), and the hot air is uniformly distributed and stabilized in the air chamber.

[0032] like Figure 2As shown, a directional air cap (2) is installed on the bottom air distribution plate (1). The outlet air direction of the directional air cap (2) points to the center discharge hole (3) of the bottom air distribution plate (1). The screen pipe (7) is connected below the discharge hole (3).

[0033] Hot air from the lower air chamber (17) and side air chambers (18) enters the internal space of the fluidized bed fluidization chamber (19) through the directional air cap (2). Inside the fluidization chamber (19), due to the combined action of the directional air cap (2) and the side air distribution plate, a horizontal wind blowing from all sides to the center is formed. The hot air fluidizes the inert bed material particles (20) and forms an internal circulation flow field with "a spring in the center and a confluence around the edges". The circulating flow of the inert bed material particles (20) is like... Figure 1 As indicated by the middle arrow, this three-dimensional air distribution system exhibits good fluidization, stable flow field, and strong resistance to changes in air volume, air pressure, and wastewater flow rate. The saline wastewater sprayed onto the inert bed material particles (20) is rapidly heated by the particles and hot air, causing the water to evaporate into water vapor and the salt to crystallize into solids. These solids then detach from the bed material particles during friction and collision, becoming small particles that are carried away by the hot air exhaust. The three-dimensional air distribution device demonstrates good fluidization and ensures stable and reliable operation of the drying bed.

[0034] If non-fluidized agglomerates appear in the fluidized bed (19) due to some parameters deviating too much from the design value, the non-fluidized agglomerates will be gradually pushed to the center of the bottom air distribution plate, i.e., at the discharge hole (3), by the horizontal wind from the lateral air distribution plate and the directional air cap. Figure 1 As shown, the screen pipe (7) directly connected below the bottom air distribution plate (1) has side air distribution holes. Hot air enters the screen pipe (7) through the side air distribution holes and forms a vertical upward airflow that is sprayed out from the center of the bottom air distribution plate. This air is called "screening air". Small, non-agglomerated bed material particles are blown directly upward into the "spring", while bed material particles that have agglomerated are too heavy to be blown and fall into the screen pipe (7). This process is called "screening". When discharge is required, the discharge valve (9) is opened to quickly discharge the non-fluidized agglomerates from the discharge port (10). Then the discharge valve (9) is closed. The whole process does not affect the operation of the hot air jet bed.

[0035] The inert bed material particles (20) circulate within the jet bed, causing normal wear on the air distribution plate. The air distribution plate needs to be replaced after a certain service life. In this embodiment, the air distribution device replacement process is as follows:

[0036] First, when the hot air jet bed is stopped, open the discharge valve (9) to discharge most of the bed material particles in the fluidization chamber (19). Ensure that the remaining small amount of bed material particles remain inside the bowl-shaped structure of the three-dimensional air distribution device, and then close the discharge valve (9).

[0037] Second, remove the bolts connecting the hot air expansion joint (15) to the lower air chamber (17).

[0038] Third, remove the fastening bolts (14) of the fixed flange (13), and the entire three-dimensional air distribution device component is moved downward out of the fluidization chamber (19) and can be moved to a safe position.

[0039] Fourth, install the new three-dimensional air distribution device components in reverse order of the disassembly process, and tighten the fastening bolts (14) of the fixing flange (13).

[0040] Fifth, put the hot air expansion joint (15) back in place and install the bolts.

[0041] Sixth, the wastewater jet bed resumed operation.

[0042] The three-dimensional air distribution device designed in this utility model uses welding to connect all parts, including the bottom air distribution plate (1), directional air cap (2), side air distribution plates (4), side walls (6, 11) of the air chamber, top plate (5), as well as the screening pipe (7) and discharge pipe (8), into a single integrated component. The hot air expansion joint (15) is connected by a flange, providing space and convenience for the disassembly and installation of the three-dimensional air distribution device. The entire three-dimensional air distribution device is connected to the fluidization chamber by a flange, making it easy to disassemble and assemble. These design details shorten replacement time and improve maintenance efficiency.

[0043] Example 2: A three-dimensional air distribution device using a bottom air intake method:

[0044] like Figure 3 and Figure 4 As shown, the fluidization chamber of the hot air jet dryer in a certain project is an inverted frustum shape, equipped with a three-dimensional air distribution device with a circular cross-section. According to the technical principle of this utility model, a three-dimensional air distribution device is configured for the hot air jet dryer in this project, including a bottom air distribution plate (1), a side air distribution plate (4), a lower air chamber (17), a side air chamber (18), a screen pipe (7), a discharge pipe (8), a fixed flange (13), a hot air expansion joint (15), and other parts, which are connected into a whole component. The bottom air distribution plate (1) uses a direct air distribution hole method. The air distribution hole is divided into two density areas, which are a high-density hole area and a low-density hole area from the inside to the outside. Side air distribution holes are opened on the side air distribution plate (4).

[0045] Furthermore, such as Figure 3 As shown, the three-dimensional air distribution device configured in this embodiment adopts a bottom air intake method. The air inlet of the lower air chamber (17) is on the lower side and is connected to a hot air expansion joint (15) and an air supply pipe (16).

[0046] Furthermore, a discharge hole (3) is opened at the center of the high-density hole area of ​​the bottom air distribution plate (1), and a screen pipe (7) is connected below the discharge hole (3). The screen pipe (7) has a diameter of 125mm and a length of 50mm.

[0047] Furthermore, since the air supply pipe (16) is directly below the lower air chamber (17), the discharge pipe is designed to exit from the side. Specifically, in this embodiment, the discharge pipe (8) has a diameter of 125 mm, and both the inner bend (21) and the outer bend (22) are 45° bends. The discharge pipe (8) passes through the side wall (11) of the lower air chamber (17) to reach the outside of the air chamber, and connects the outer bend (22), the discharge valve (9), and the discharge port (10).

[0048] Furthermore, the outer wall panel (11) of the lower air chamber (17) is selected as an inclined wall surface, with the included angle between the two side walls being 15°, and the lower air chamber is a frustum-shaped gradually expanding air chamber.

[0049] Furthermore, the top plate (5) of the side air chamber (18) is an inclined wall with an angle of 30-45° with the horizontal plane. In this embodiment, 30° is selected. The outer wall plate (6) of the side air chamber (18) is a vertical wall with a height of 100mm and an angle of 90° with the horizontal plane. The outer diameter of the outer wall plate of the side air chamber is 3mm smaller than the inner diameter of the lower interface of the fluidized bed fluidization chamber (19). This is beneficial for the installation and disassembly of the three-dimensional air distribution device.

[0050] Furthermore, the fixed flange (13) and the wastewater spray fluidized bed chamber (19) are connected and fixed by bolts (14).

[0051] Furthermore, the axial length of the hot air expansion joint (15) is selected as 200mm. The upper flange of the hot air expansion joint (15) is connected to the lower air chamber wall (11), and the lower flange of the hot air expansion joint (15) is connected to the air supply duct (16).

[0052] This embodiment is used as follows:

[0053] like Figure 3 As shown, the drying heat source of the hot air jet bed is hot air at 320°C. The hot air is delivered to the lower air chamber (17) of this three-dimensional air distribution device through the air supply pipe (16). The lower air chamber (17) is a gradually expanding flow channel space and is connected to the side air chamber (18). The hot air is uniformly distributed and pressure stabilized in the air chamber.

[0054] like Figure 4 As shown, the bottom air distribution plate (1) has air distribution holes. The air distribution holes are divided into two density areas, which are high density hole area and low density hole area from the inside to the outside. A discharge hole (3) is opened in the center of the high density hole area. The screen pipe (7) is connected below the discharge hole (3).

[0055] Hot air from the lower air chamber (17) and the side air chamber (18) enters the internal space of the fluidized bed chamber (19) through the air distribution holes. Inside the fluidized bed chamber (19), the wind speed is high in the high-density hole area and low in the low-density hole area. Due to the side air distribution plates, a horizontal wind blowing from all sides to the center is formed. The hot air fluidizes the inert bed particles (20) and forms an internal circulation flow field with "a spring in the center and a confluence around the perimeter". The high wind speed in the center, the low wind speed around the perimeter, and the side air distribution work together to form a three-dimensional air distribution, resulting in good fluidization effect, stable flow field, and strong resistance to changes in air volume, air pressure, and wastewater flow rate. The saline wastewater sprayed on the inert bed particles (20) is rapidly heated by the bed particles and hot air. The water evaporates into water vapor, and the salt crystallizes into solids. The salt is broken off into small particles by friction and collision of the bed particles and carried away by the hot air exhaust. The three-dimensional air distribution device has a good fluidization effect, and the drying bed operates stably and reliably.

[0056] If non-fluidized agglomerates appear in the fluidized bed (19) due to some parameters deviating too much from the design value, the non-fluidized agglomerates will be gradually pushed to the center of the bottom air distribution plate by the horizontal wind from the side air distribution plate, that is, at the discharge hole (3). The principle of screening and discharge is the same as in Example 1, and will not be repeated here.

[0057] The replacement method of the three-dimensional air distribution device in this embodiment is basically the same as that in embodiment one. It should be noted that in the second step, the bolts of the hot air expansion joint (15) need to be removed and all of them removed, leaving a vertical space of 200mm, so that the three-dimensional air distribution device can be disassembled and replaced.

[0058] The above description outlines the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the scope of the utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A three-dimensional air distribution device for a wastewater spouted bed, characterized in that: The components include a bottom air distribution plate (1), a side air distribution plate (4), a lower air chamber (17), a side air chamber (18), a screen pipe (7), a discharge pipe (8), a fixed flange (13), and a hot air expansion joint (15), which are connected to form an integral component. The bottom air distribution plate (1) distributes air by installing a directional air cap (2) or by directly opening air distribution holes. The outlet air direction of the directional air cap (2) points to the center discharge hole (3) of the bottom air distribution plate (1). The air distribution holes are divided into two density areas, which are high-density hole area and low-density hole area from the inside to the outside. Side air distribution holes are opened on the side air distribution plate (4).

2. The three-dimensional cloth air distribution device of claim 1, wherein: The bottom air distribution plate (1) has a discharge hole (3) at its center. The discharge hole (3) is connected to a screen pipe (7), which is connected to a discharge pipe (8). The discharge pipe (8) passes through the bottom plate (12) or side wall of the lower air chamber (17) to reach the outside of the lower air chamber (17) and is connected to a discharge valve (9) and a discharge port (10).

3. The three-dimensional cloth air distribution device of claim 1, wherein: The diameter of the screen tube (7) is 100-150mm and the length is 40-80mm. The side wall of the screen tube (7) has air distribution holes. The hot air in the lower air chamber (17) can pass through the air distribution holes on the side wall of the screen tube (7) and enter the screen tube (7) and enter the fluidization chamber (19) upward.

4. The three-dimensional cloth air distribution device of claim 1, wherein: The top plate (5) of the side ventilation chamber (18) is an inclined wall with an angle of 30-45° to the horizontal plane; the outer wall plate (6) of the side ventilation chamber (18) is a vertical wall.

5. The three-dimensional cloth air distribution device of claim 1, wherein: The fixed flange (13) is connected and fixed to the wastewater spray bed fluidization chamber (19) by bolts (14).

6. The three-dimensional cloth air distribution device of claim 1, wherein: The hot air expansion joint (15) is connected to the lower air chamber (17) and the air supply duct (16) via a flange connection.

7. The three-dimensional cloth air distribution device of claim 1, wherein: The lower air chamber (17) can be a side air intake or a bottom air intake. The lower air chamber outer wall panel (11) is a vertical wall or an inclined wall. When the bottom air intake is adopted and the lower air chamber outer wall panel (11) is an inclined wall, the included angle between the two walls is no more than 20°.

8. The three-dimensional cloth air distribution device of claim 1, wherein: When the lower air chamber (17) adopts the bottom air intake method, the discharge pipe (8) passes through the side wall of the lower air chamber (17) to reach the outside of the lower air chamber (17). It is necessary to add an inner bend (21) and an outer bend (22). The bending angle of the inner bend (21) and the outer bend (22) is 30-45°.

9. The three-dimensional cloth air distribution device of claim 1, wherein: When the lower air chamber (17) adopts the bottom air intake method, the axial length of the hot air expansion joint (15) is greater than the height of the outer wall panel (6) of the side air chamber.

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