Integrated oxidation tower

Abstract

The utility model discloses an integrated oxidation tower, aiming at solving the problems of high investment and operation cost and large occupied area when an existing oxidation tower is used for removing organic matters and reducing impurities in wastewater. The tower body is provided with a water inlet pipe at the upper part, a water outlet pipe and a gas inlet pipe at the lower part, a tail gas pipe at the top, and a first aeration device, a first catalyst, a second aeration device and a second catalyst arranged in the tower body from bottom to top; according to the method, the reducing impurities and the organic matters in the wastewater are effectively removed in sequence by fully utilizing the characteristics that the requirements of the organic matters and the reducing impurities in the wastewater on the concentrations of ozone and oxygen and the requirements on the reaction time are different; the device is simple in overall structure, convenient to use, free of complex mechanical structures, low in machining precision requirement, capable of removing organic matter and reducing impurities at the same time, capable of reducing the occupied area, capable of reducing the investment cost and the operation cost, good in operation stability and convenient to maintain.

Description

Technical Field

[0001] This application relates to the technical field of oxidation absorption towers, and specifically to an integrated oxidation tower. Background Art

[0002] Currently, in the fields of zero discharge of wastewater from coal chemical plants and thermal power plants and resource utilization of desulfurization ash, there are both organic substances and reducing impurities such as sulfite ions and ammonium ions in the wastewater. Generally, the removal of organic substances and reducing impurities is divided into two oxidation process units. Since the two processes have different requirements for the oxidation intensity of the oxidant and the type of catalyst, this separation treatment method has the disadvantages of high investment cost, large floor area, and high operation and maintenance cost.

[0003] Patent document CN117756261A provides a high-efficiency and high-mixing oxidation tower. By arranging a multi-stage distribution device inside the cylinder, distribution pipes are welded on the distribution plate, and multiple through holes inclined downward at 45° are drilled on the distribution pipes, which plays an effective role in distributing materials and increasing the reaction efficiency; at the same time, an auxiliary liquid inlet is adopted, and angle steels are welded inside to make the auxiliary liquid perform diffusion-type distribution, increasing the contact area between materials, thereby improving the working efficiency of the oxidation tower.

[0004] Patent document CN117398837B provides a composite absorption oxidation tower. Exhaust gas enters the tower body from the exhaust gas inlet, starts the motor to drive the driving ram to rotate, drives the reciprocating screw rod to rotate through the arranged bevel gear set, and then drives the driving plate to slide up and down on the inner wall of the tower body. As the driving plate continuously slides downward, it will abut against and squeeze the inclined plate, forcing the inclined plate to drive the sealing plate to slide to the right inside the tower body, stretching the first elastic member. At this time, the sealing plate moves away from the through hole and the exhaust gas outlet. The exhaust gas at the bottom of the tower body enters the absorption and filtration space formed between the upper side of the partition plate and the inner wall of the tower body through the through hole. As the reciprocating screw rod continues to rotate, the driving plate will immediately rise and separate from the inclined plate. At this time, the inclined plate and the sealing plate will reset under the action of the first elastic member after a short rightward movement, closing the through hole and the exhaust gas outlet. Since the upper side of the reciprocating screw rod is longer, the driving plate will not push the inclined plate down again in a short time. At this time, the exhaust gas will stay in the absorption and filtration space formed between the upper end of the partition plate and the inner wall of the tower body for a long time. At the same time, the circulation pump will also be started, and the limestone slurry at the bottom of the tower body will be pumped out through the circulation pipe and the atomizing nozzle, and sprayed in the absorption and filtration space formed between the inner wall of the tower body and the upper end of the partition plate to effectively oxidize, absorb and filter the sulfur in the exhaust gas in the space. When the driving plate descends again to squeeze the inclined plate and the sealing plate, the filtered exhaust gas will be discharged from the exhaust gas outlet, realizing the batch filtration, absorption and oxidation of the exhaust gas, thus avoiding the situation where a large amount of exhaust gas passes through the filtration uniformly, and some exhaust gas is not thoroughly filtered, absorbed and oxidized and is directly discharged. The absorption, oxidation and filtration effect of the exhaust gas is better.

[0005] The designs of the above two oxidation towers are only for improving the oxidation efficiency of ozone, but cannot solve the problems of high investment cost, large floor area, and high operation and maintenance cost when removing organic matter and reducing impurities in wastewater simultaneously. Summary of the Invention

[0006] Therefore, the present application provides an integrated oxidation tower to solve the problems of high investment and operation costs and large floor area existing in the existing oxidation tower when removing organic matter and reducing impurities in wastewater.

[0007] To achieve the above object, the present application provides the following technical solutions:

[0008] The integrated oxidation tower includes a tower body. An inlet water pipe is arranged at the upper part of the tower body, an outlet water pipe and an inlet air pipe are arranged at the lower part of the tower body, a tail gas pipe is arranged at the top of the tower body, and a first aeration device, a first catalyst, a second aeration device, and a second catalyst are arranged in the tower body from bottom to top. The inlet air pipe is connected to the first aeration device; the first aeration device and the second aeration device are respectively connected to the inner wall of the tower body, and support layers are arranged at the bottoms of the first catalyst and the second catalyst.

[0009] Optionally, it further includes a tail gas reflux pipe located outside the tower body. One end of the tail gas reflux pipe is connected to the air inlet of the second aeration device, and the other end is connected to the tail gas pipe.

[0010] Optionally, the first catalyst is one of an aluminum-based catalyst and a carbon-based catalyst; the second catalyst is a titanium dioxide catalyst.

[0011] Optionally, the filling height of the first catalyst accounts for 30-40% of the height of the tower body; the filling height of the second catalyst accounts for 10-20% of the height of the tower body.

[0012] Optionally, the support layer is a metal mesh structure.

[0013] Optionally, the ratio of the height to the diameter of the tower body ranges from 2:1 to 5:1.

[0014] Optionally, the first aeration device and the second aeration device are disk aerators or tube aerators or micro-nano aerators.

[0015] Optionally, the inlet water pipe and the outlet water pipe are located on different sides of the tower body; the inlet water pipe and the inlet air pipe are located on the same side of the tower body.

[0016] Optionally, the inner wall of the tower body is provided with a third load-bearing block for lapping the support layer.

[0017] Optionally, the inner wall of the tower body is further provided with a first load-bearing block and a second load-bearing block, and the first aeration device and the second aeration device are respectively connected to the inner wall of the tower body through the first load-bearing block and the second load-bearing block.

[0018] Compared with the prior art, the present application has at least the following beneficial effects:

[0019] 1. Based on further analysis and research of the problems in the prior art, the present application provides an integrated oxidation tower. The upper part of the tower body is provided with a water inlet pipe, the lower part of the tower body is provided with a water outlet pipe and an air inlet pipe, the top of the tower body is provided with a tail gas pipe, and the inside of the tower body is provided with a first aeration device, a first catalyst, a second aeration device, and a second catalyst from bottom to top. The present application makes full use of the characteristics that the concentration requirements of organic matter and reducing impurities in wastewater for ozone and oxygen are different. High-concentration ozone is combined with the organic matter removal catalyst to remove organic matter (the first catalyst), and the mixed gas of ozone and oxygen remaining after insufficient reaction is combined with the reducing impurity removal catalyst (the second catalyst) for impurity removal. The overall structure of the present application is simple, easy to use, without complex mechanical structures, and has low requirements for processing accuracy. With an integrated design, the processes of removing organic matter and reducing impurities are integrated together, which can simultaneously complete the removal of organic matter and reducing impurities, realize the full utilization of ozone, reduce the investment and operation costs, reduce the process units and floor area, and has good operation stability and is also convenient for maintenance;

[0020] 2. The present application is also provided with a tail gas reflux pipe. One end of the tail gas reflux pipe is connected to the second aeration device, and the other end is connected to the tail gas pipe, which makes full use of the tail gas, saves energy and reduces emissions, and further reduces the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more intuitively illustrate the prior art and the present application, the following exemplary drawings are given. It should be understood that the specific shapes and structures shown in the drawings generally should not be regarded as limiting conditions when implementing the present application; for example, those skilled in the art are capable of making conventional adjustments or further optimizations to the addition / removal / attribution division of certain units (components), specific shapes, positional relationships, connection methods, dimensional proportional relationships, etc. based on the technical concept disclosed in the present application and the exemplary drawings.

[0022] Figure 1 It is a schematic structural diagram of an integrated oxidation tower provided by an embodiment of the present application.

[0023] Description of the reference numerals:

[0024] 1. Tower body; 101. Water inlet pipe; 102. Water outlet pipe; 103. Air inlet pipe; 104. Tail gas pipe;

[0025] 2. First aeration device; 3. First catalyst; 4. Second aeration device; 5. Second catalyst;

[0026] 6. Tail gas reflux pipe;

[0027] 7. First load-bearing block; 8. Second load-bearing block; 9. Support layer. Detailed implementation manners

[0028] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the description of the present application: Unless otherwise specified, the meaning of "a plurality" is two or more. Terms such as "first", "second", "third", etc. in the present application are intended to distinguish the objects being referred to, and do not have special significance in terms of technical connotations (for example, they should not be understood as emphasizing importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0030] Terms such as "upper", "lower", "left", "right", "middle", etc. cited in the present application are usually indications of the general relative position relationship for the convenience of intuitive understanding with reference to the accompanying drawings, and are not absolute limitations on the position relationship in the actual product.

[0031] In an embodiment of the present application, an integrated oxidation tower, as Figure 1 shown, includes a tower body 1. An inlet water pipe 101 is provided at the upper part of the tower body 1, an outlet water pipe 102 and an inlet air pipe 103 are provided at the lower part of the tower body 1, and a tail gas pipe 104 is provided at the top of the tower body 1. Inside the tower body 1, a first aeration device 2 (1# aeration device), a first catalyst 3 (1# catalyst), a second aeration device 4 (2# aeration device), and a second catalyst 5 (2# catalyst) are arranged from bottom to top. The inlet air pipe 103 is connected to the first aeration device 2; the first aeration device 2 and the second aeration device 4 are respectively connected to the inner wall of the tower body 1, and support layers 9 are provided at the bottoms of the first catalyst 3 and the second catalyst 5.

[0032] In this embodiment, the first catalyst 3 is one of an aluminum-based and a carbon-based catalyst; the second catalyst 5 is a titanium dioxide catalyst.

[0033] Preferably, it further includes a tail gas reflux pipe 6 located outside the tower body 1. One end of the tail gas reflux pipe 6 is connected to the air inlet of the second aeration device 4, and the other end is connected to the tail gas pipe 104.

[0034] Preferably, the support layer 9 is a metal mesh structure, having the characteristics of oxidation resistance, corrosion resistance, and high strength.

[0035] Preferably, the filling height of the first catalyst 3 accounts for 30-40% of the height of the tower body 1; the filling height of the second catalyst 5 accounts for 10-20% of the height of the tower body 1.

[0036] More preferably, the ratio of the height to the diameter (height-diameter ratio) of the tower body 1 ranges from 2:1 to 5:1.

[0037] Preferably, the first aeration device 2 and the second aeration device 4 are one of a disk aerator, a tube aerator, and a micro-nano aerator.

[0038] Preferably, the water inlet pipe 101 and the water outlet pipe 102 are located on different sides of the tower body 1 and can be located on opposite sides; the water inlet pipe 101 and the air inlet pipe 103 are located on the same side of the tower body 1.

[0039] Preferably, a third load-bearing block is fixedly arranged on the inner wall of the tower body 1, and the third load-bearing block is used to lap and support the supporting layer 9.

[0040] More preferably, a first load-bearing block 7 and a second load-bearing block 8 are further arranged on the inner wall of the tower body 1. The first aeration device 2 and the second aeration device 4 are respectively connected to the inner wall of the tower body 1 through the first load-bearing block 7 and the second load-bearing block 8, and the air inlet pipe 103 is connected to the air inlet of the first aeration device 2.

[0041] Preferably, legs for support are arranged at the bottom of the tower body 1, and a valve for controlling the exhaust of tail gas is further arranged on the tail gas pipe 104.

[0042] The working process of this application:

[0043] The mixed gas of ozone and oxygen is introduced into the tower body 1 from bottom to top. The concentration of the mixed gas in the lower part of the tower body 1 is high, and the concentration of the mixed gas in the upper part of the tower body 1 is low. Specifically: The mixed gas is introduced through the air inlet pipe 103 at the bottom of the tower body 1, first exposed by the first aeration device 2, enters the first catalyst 3, then is exposed by the second aeration device 4, enters the second catalyst 5, and part of the remaining tail gas is discharged through the tail gas pipe 104, and part of the tail gas passes through the tail gas return pipe 6 to be exposed by the second aeration device 4;

[0044] The wastewater is introduced into the tower body 1 from top to bottom. Specifically: The wastewater enters the interior of the tower body 1 from the water inlet pipe 101 at the top of the tower body 1, first flows through the second catalyst 5 to undergo a catalytic oxidation reaction with the low-concentration mixed gas exposed by the second aeration device 4 to oxidize the redox impurities; then it flows through the first catalyst 3 to undergo a catalytic oxidation reaction with the high-concentration mixed gas exposed in the first aeration device 2 to oxidize the organic matter; after the wastewater is fully oxidized, it flows out from the water outlet pipe 102 at the bottom of the tower body 1.

[0045] In summary, this application has at least the following advantages:

[0046] Since reducing impurities are easily oxidized, the requirement for ozone concentration is not high and the oxidation time is short. However, the removal of organic matter in industrial wastewater requires a relatively high ozone concentration. Therefore, this application makes full use of the characteristics that the requirements for the concentrations of ozone and oxygen and the reaction time are different for organic matter and reducing impurities in wastewater (where the requirements for the concentrations of ozone and oxygen by reducing impurities are not high and the reaction time is also relatively short). Specifically, ozone and oxygen are introduced from the bottom up in the tower body, and the wastewater flows from the top down in the tower body, so that the low-concentration ozone and oxygen mixed gas at the top of the tower body undergoes a catalytic oxidation reaction under the action of the second catalyst, first oxidizing the reducing impurities; secondly, when the wastewater continues to flow down, the high-concentration ozone and oxygen mixed gas at the bottom of the tower body will undergo a catalytic oxidation reaction under the action of the second catalyst to oxidize the organic matter, and finally it is discharged from the water outlet at the bottom of the tower body; the overall structure of this application is simple and convenient to use, without complex mechanical structures, and the processing accuracy requirements are not high, and it can ensure the stability of its operation;

[0047] At the same time, in the traditional scheme, two devices are required to remove organic matter and reducing impurities respectively, which has problems of large floor area and high investment cost. This application can integrate the two independent devices in the prior art into one body, which can simultaneously complete the removal of organic matter and reducing impurities, reduce the floor area, and lower the investment cost;

[0048] In addition, a tail gas reflux pipe is also provided. One end of the tail gas reflux pipe is connected to the air inlet of the second aeration device, and the other end is connected to the tail gas pipe, so as to make full use of the tail gas, save energy and reduce emissions, and lower the operating cost.

[0049] Using the integrated oxidation tower provided by this application for corresponding tests, the removal rate of reducing impurities in the wastewater after oxidation by this device can reach more than 95%, and the removal rate of organic matter can reach more than 60%. The following are three application examples:

[0050] 1. Example 1

[0051] An integrated oxidation tower designed for the desulfurization ash resource utilization project of an enterprise. In this example,

[0052] (1) The height-diameter ratio of the tower body 1 of the integrated oxidation tower is 2:1, the designed residence time is 0.5 h, and the flow rate in the tower is 10 m / h;

[0053] (2) The first aeration device 2 and the second aeration device 4 are disk aerators;

[0054] (3) The supporting layers of the first catalyst 3 and the second catalyst 5 are metal mesh structures; the filling height of the first catalyst 3 accounts for 30% of the height of the tower body 1, and the filling height of the second catalyst 5 accounts for 10% of the height of the tower body 1;

[0055] (4) The first catalyst 3 is a carbon-based catalyst, and the second catalyst 5 is a titanium dioxide catalyst.

[0056] After setting the above parameters, the removal rate of reducing impurities in the wastewater after oxidation by this device is 95.4%; the removal rate of organic matter is 61%.

[0057] 2. Example 2

[0058] An integrated oxidation tower designed for a coal chemical zero-emission project of an enterprise. In this example,

[0059] (1) The height-to-diameter ratio of the integrated oxidation tower body 1 is 4:1, the designed residence time is 1 h, and the flow velocity in the tower is 8 m / h;

[0060] (2) The first aeration device 2 and the second aeration device 4 are tubular aerators;

[0061] (3) The supporting layer of the first catalyst 3 and the second catalyst 5 is a metal mesh structure; the filling height of the first catalyst 3 accounts for 35% of the height of the tower body 1, and the filling height of the second catalyst 5 accounts for 15% of the height of the tower body 1;

[0062] (4) The first catalyst 3 is an aluminum-based catalyst, and the second catalyst 5 is a titanium dioxide catalyst.

[0063] After setting the above parameters, the removal rate of reducing impurities in the wastewater after oxidation by this device is 97%; the removal rate of organic matter is 66%.

[0064] 3. Example 3

[0065] An integrated oxidation tower designed for a comprehensive wastewater treatment project of a power plant. In this example,

[0066] (1) The height-to-diameter ratio of the integrated oxidation tower body 1 is 5:1, the designed residence time is 2 h, and the flow velocity in the tower is 5 m / h;

[0067] (2) The first aeration device 2 and the second aeration device 4 are nano-micro aerators;

[0068] (3) The supporting layer of the first catalyst 3 and the second catalyst 5 is a metal mesh structure; the filling height of the first catalyst 3 accounts for 40% of the height of the tower body 1, and the filling height of the second catalyst 5 accounts for 20% of the height of the tower body 1;

[0069] (4) The first catalyst 3 is an aluminum-based catalyst, and the second catalyst 5 is a titanium dioxide catalyst.

[0070] After setting the above parameters, the removal rate of reducing impurities in the wastewater after oxidation by this device is 99%; the removal rate of organic matter is 68%.

[0071] The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features). For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written out should also be regarded as falling within the scope described in this specification.

Claims

1. An integrated oxidation tower, characterized in that: The tower body comprises a water inlet pipe on the upper part of the tower body, a water outlet pipe and an air inlet pipe on the lower part of the tower body, a tail gas pipe on the top of the tower body, a first aeration device, a first catalyst, a second aeration device and a second catalyst arranged inside the tower body from bottom to top, the air inlet pipe is connected to the first aeration device; the first aeration device and the second aeration device are respectively connected to the inner wall of the tower body, and a supporting layer is arranged at the bottom of the first catalyst and the second catalyst.

2. The integrated oxidation tower according to claim 1, characterized in that: It also includes a tail gas return pipe located outside the tower body, one end of the tail gas return pipe is connected to the air inlet of the second aeration device, and the other end is connected to the tail gas pipe.

3. The integrated oxidation tower according to claim 1, characterized in that: The first catalyst is one of an aluminum-based catalyst and a carbon-based catalyst; the second catalyst is a titanium dioxide catalyst.

4. The integrated oxidation tower according to claim 1 or 3, characterized in that: The filling height of the first catalyst accounts for 30-40% of the tower body height; the filling height of the second catalyst accounts for 10-20% of the tower body height.

5. The integrated oxidation tower according to claim 1, characterized in that: The supporting layer is a metal mesh structure.

6. The integrated oxidation tower according to claim 1 or 2, characterized in that: The ratio of the height to the diameter of the tower body is in the range of 2:1-5:

1.

7. The integrated oxidation tower according to claim 1, characterized in that: The first aeration device and the second aeration device are disc aerators, tubular aerators or micro-nano aerators.

8. The integrated oxidation tower according to claim 1, characterized in that: The water inlet pipe and the water outlet pipe are located on different sides of the tower body; the water inlet pipe and the air inlet pipe are located on the same side of the tower body.

9. The integrated oxidation tower according to claim 5, characterized in that: The inner wall of the tower body is provided with a third load-bearing block for overlapping the supporting layer.

10. The integrated oxidation tower according to claim 1 or 9, characterized in that: The inner wall of the tower body is further provided with a first load-bearing block and a second load-bearing block, and the first aeration device and the second aeration device are respectively connected to the inner wall of the tower body through the first load-bearing block and the second load-bearing block.

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