Tail gas filtering system

Abstract

The invention discloses a tail gas filtering system, and relates to the technical field of tail gas treatment, the tail gas filtering system comprises a wet dust removal tank, the wet dust removal tank is connected to an exhaust port of a waste liquid treatment device, and tail gas passes through liquid in the wet dust removal tank; and the wet dust removal tank is externally connected with a high-efficiency filter. The device has the beneficial effects that the wet dust removal tank can wash and collect solids such as collected catalyst dust and the like, and the blockage risk of a tail gas system is reduced through regular cleaning by using a water outlet in the bottom; on the other hand; when parts in the tail gas system are blocked or damaged, the mechanical arm can be used for quickly checking and replacing the parts. And the risk of shutdown is reduced while the personnel are prevented from being injured by radiation.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to a tail gas filtering system. Background Art

[0002] The tail gas system of the existing radioactive liquid waste treatment device adopts a bag collector, the function of which is to first remove the catalyst dust and other solids entrained in the tail gas through the bag collector before discharging it. If a bag collector is used, the catalyst powder entrained in the tail gas will accumulate and enrich in the bags, and the bags need to be cleaned regularly. On the one hand, the cleaning of the bags is relatively complicated and requires personnel to operate at close range. During the actual treatment process, the device and the tail gas system will be radioactively contaminated, and personnel operating at close range will be at risk of radiation exposure. On the other hand, the accumulation of powder in the bags will bring the risk of blockage and pressure buildup in the tail gas system, which will in turn cause the risk of pressure buildup and shutdown of the front-end reactor of the waste liquid treatment device. Summary of the invention

[0003] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the above-mentioned prior art problems, the present invention is proposed.

[0005] The present invention aims to provide an exhaust gas filtration system, which aims to solve the problem that accumulation of powder in a bag may cause blockage and pressure buildup in the exhaust gas system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an exhaust gas filtration system, comprising a wet dust removal tank, the wet dust removal tank is connected to the exhaust port of the waste liquid treatment device, and the exhaust gas passes through the liquid inside the wet dust removal tank;

[0007] The wet dust removal tank is externally connected with a high efficiency filter.

[0008] As a preferred solution of the exhaust gas filtration system of the present invention, the wet dust removal tank comprises a first end face close to the waste liquid treatment device and a second end face away from the other end of the first end face, and the bottom radius of the wet dust removal tank close to the second end face gradually decreases.

[0009] As a preferred solution of the exhaust gas filtration system of the present invention, wherein: the first end surface is externally connected with an air inlet pipe and an air outlet pipe, and the air inlet pipe extends to the interior of the wet dust removal tank;

[0010] There is a height difference between the lower ends of the air inlet pipe and the air outlet pipe, and the lower end of the air inlet pipe is closer to the second end face.

[0011] As a preferred solution of the exhaust gas filtration system of the present invention, the outer wall of the wet dust removal tank is connected to a transparent tube liquid level gauge.

[0012] As a preferred solution of the exhaust gas filtration system of the present invention, the wet dust removal tank is externally connected with a water injection port and a water discharge port.

[0013] As a preferred solution of the exhaust gas filtration system of the present invention, an activated carbon storage tank is provided between the wet dust removal tank and the high efficiency filter.

[0014] As a preferred solution of the exhaust gas filtration system of the present invention, the activated carbon storage tank is internally provided with an activated carbon layer, and the volume of the activated carbon layer exceeds 90% of the volume of the tank body.

[0015] As a preferred solution of the exhaust gas filtration system of the present invention, the activated carbon storage tank is externally connected with a gas pipeline connected to the gas outlet pipeline and an exhaust pipeline connected to the high-efficiency filter, and the gas pipeline extends to the inside of the activated carbon layer.

[0016] As a preferred solution of the exhaust gas filtration system of the present invention, the wet dust removal tank is made of a stainless steel tank body.

[0017] As a preferred solution of the exhaust gas filtration system of the present invention, the high efficiency filter is a can-type glass fiber filter with a stainless steel shell.

[0018] The tail gas filtration system of the present invention has the following beneficial effects: the wet dust removal tank can collect solids such as catalyst dust by washing, and use the drainage port at the bottom to regularly clean it, thereby reducing the risk of blockage in the tail gas system; on the other hand, when there is blockage or damage to the components in the tail gas system, a manipulator can be used to quickly check and replace them, thereby preventing personnel from being harmed by radiation and reducing the risk of shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0020] Figure 1 This is a connection diagram of the exhaust gas filtration system in the present invention.

[0021] Figure 2 It is an axonometric view of the wet dust removal tank in the present invention.

[0022] Figure 3 It is a top view and a cross-sectional view of the wet dust removal tank in the present invention.

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of exhaust gas flow.

[0024] Figure 5 It is a side view of the wet dust removal tank in the present invention.

[0025] Figure 6 It is a side view of the wet dust removal tank in the present invention.

[0026] Figure 7 For the present invention Figure 6 Cross-sectional view of a medium wet dust removal tank.

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of tail gas and liquid circulation.

[0028] Fig. 9 It is a top view of the wet dust removal tank in the present invention.

[0029] Fig.10 It is a cross-sectional view of the wet dust removal tank in the present invention.

[0030] Fig.11 For the present invention Fig. 9 Schematic diagram of tail gas and liquid circulation.

[0031] Fig.12 It is a top view and a cross-sectional view of the activated carbon storage tank in the present invention.

[0032] Fig.13 For the present invention Fig.11 Schematic diagram of exhaust gas flow. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Example 1

[0037] Reference Figure 1 , which is the first embodiment of the present invention, and provides an exhaust gas filtration system, including a wet dust removal tank 100, the wet dust removal tank 100 is connected to the exhaust port of the waste liquid treatment device, and the exhaust gas passes through the liquid inside the wet dust removal tank 100;

[0038] The wet dust removal tank 100 is externally connected to a high efficiency filter 200 .

[0039] Among them, waste liquid treatment equipment refers to equipment used to treat organic waste liquid containing radioactive substances. These devices use a variety of technologies to purify tail gas containing radioactive substances to reduce the potential threat of radioactive substances to the environment and human health. This is the existing technology and will not be described in detail. Tail gas is generated during the treatment of organic waste liquid. Direct discharge of this tail gas will cause pollution, so it needs to be treated before discharge.

[0040] The high efficiency filter 200 is a filter that can capture tiny particles in the air, and its filtering efficiency is usually above 99.97%. This is a prior art and will not be described in detail.

[0041] In the exhaust gas treatment of the prior art, the wet dust removal tank 100 replaces the bag collector. The liquid inside the wet dust removal tank 100 can be water. When the exhaust gas passes through the liquid, the catalyst dust and other solids entrained in the exhaust gas are absorbed and removed. The solids such as the catalyst dust in the exhaust gas are separated by utilizing the characteristics that the gas in the exhaust gas is insoluble in water and the powder can sink in water. The advantage of such a design is that the wet dust removal tank 100 can filter the catalyst dust and other solids without dust clogging. The accumulation of powder in the bag is prevented from causing the risk of blockage and pressure buildup in the exhaust system, which in turn causes the risk of pressure buildup and shutdown of the front-end reactor of the waste liquid treatment device.

[0042] In summary, the exhaust gas generated by the waste liquid treatment device is discharged into the wet dust removal tank 100, and then the exhaust gas passes through the liquid inside the wet dust removal tank 100. This process separates the solids such as catalyst dust in the exhaust gas, and then the exhaust gas not containing solids such as catalyst dust is discharged into the high-efficiency filter 200. The radioactive aerosols contained in the exhaust gas are filtered through the high-efficiency filter 200, and then the exhaust gas is continued to be treated according to the existing technology and then discharged.

[0043] Example 2

[0044] Reference Figures 2 to 10 , which is a second embodiment of the present invention, includes a wet dust removal tank 100 externally connected to an air inlet pipe 101 and an air outlet pipe 102, and the air inlet pipe 101 extends to the interior of the wet dust removal tank 100;

[0045] There is a height difference between the lower ends of the air inlet duct 101 and the air outlet duct 102 , and the lower end of the air inlet duct 101 is closer to the bottom of the wet dust removal tank 100 .

[0046] The wet dust removal tank 100 is a cylinder with a cavity inside; the air inlet duct 101 and the air outlet duct 102 can be set at positions that allow the air to enter the wet dust removal tank 100, pass through the liquid inside the wet dust removal tank 100, and then be discharged through the air outlet duct 102; that is, the air inlet duct 101 can be set on the lower surface of the wet dust removal tank 100 or on the circumferential outer wall near the bottom (such as Figures 3 to 6 ), and extends to the interior of the wet dust removal tank 100, the outlet pipe 102 is set on the upper surface of the wet dust removal tank 100, the exhaust gas enters from the intake pipe 101, and then passes through the liquid inside the wet dust removal tank 100 to filter out solids such as catalyst dust in the exhaust gas, and the exhaust gas with solids such as catalyst dust filtered out moves upward, and then the gas above gradually gathers, the gas inside the wet dust removal tank 100 increases, the air pressure increases, and it begins to gradually flow out along the outlet pipe 102.

[0047] Preferably, the wet dust removal tank 100 comprises a first end surface 103 close to the waste liquid treatment device and a second end surface 104 away from the other end of the first end surface 103;

[0048] The air inlet duct 101 and the air outlet duct 102 are connected to the inside of the wet dust removal tank 100 from the first end surface 103 .

[0049] Among them, the upper surface of the wet dust removal tank 100 is the first end surface 103, and the lower surface of the wet dust removal tank 100 is the second end surface 104. The air inlet pipe 101 is inserted into the interior of the wet dust removal tank 100 from the first end surface 103, and one end of the air inlet pipe 101 inside the wet dust removal tank 100 is immersed in the liquid, as close to the lower surface of the wet dust removal tank 100 as possible; the air outlet pipe 102 passes through the first end surface 103 to communicate with the interior of the wet dust removal tank 100, and the bottom surface of the air outlet pipe 102 inside the wet dust removal tank 100 is in contact with the upper inner wall of the wet dust removal tank 100. The advantage of such a design is that the gas enters the wet dust removal tank 100 from the bottom, then passes through the liquid and starts to move upward. As the air pressure between the liquid surface and the upper inner wall of the wet dust removal tank 100 increases, the filtered exhaust gas begins to be discharged from the exhaust pipe 102, ensuring that the gas can stay in the liquid for a longer time and that the gas is washed by the liquid. At the same time, the adsorbed catalyst dust and other solids will first sink in the water at the bottom of the liquid. As the exhaust gas rises, the catalyst dust and other solids continue to decrease, ensuring that the catalyst dust and other solids in the discharged exhaust gas can reach the lowest value.

[0050] The bottom radius of the wet dust removal tank 100 near the second end surface 104 gradually decreases.

[0051] Among them, Figure 6 As shown, the bottom surface of the wet dust removal tank 100 is conical and the conical surface is polished. The advantage of this design is that solids such as catalyst dust will gather along the slope to the bottom to prevent adhesion to the surface, which will be difficult to clean later.

[0052] The outer wall of the wet dust removal tank 100 is connected to a transparent tube liquid level gauge 105 .

[0053] A transparent tube level gauge 105 is installed at the lower part of the outer surface of the wet dust removal tank 100. The transparent tube of the level gauge is made of acrylic material, which can ensure the strength of the level gauge and facilitate observation of the liquid volume in the dust removal tank.

[0054] The wet dust removal tank 100 is externally connected with a water inlet 106 and a water outlet 107 ; the water inlet 106 extends from the first end surface 101 to the inside of the wet dust removal tank 100 , and the water outlet 107 extends from the inside of the wet dust removal tank 100 to the outside of the wet dust removal tank 100 .

[0055] Among them, the first end surface 101 of the wet dust removal tank 100 is connected with a water injection port 106 in an array; Figure 6 to Figure 10 As shown; there can be multiple water injection ports 106 or only one, and the water injection port 106 is shown in the figure, as long as the height is higher than the position of the drain port 107. The second end face 102 of the wet dust removal tank 100 is connected with the drain port 107. When the liquid inside the wet dust removal tank 100 becomes turbid and mostly precipitated, the water injection port 106 of the first end face 101 and the drain port 107 of the second end face are opened at the same time, and the liquid begins to flow from top to bottom. The advantage of this design is that the used liquid begins to be discharged from the drain port 107 below, and at the same time, the new liquid begins to enter the interior of the wet dust removal tank 100 from the top. When draining water, a drainage effect will be formed, and there will be no turbid liquid backflow phenomenon.

[0056] In summary, the tail gas generated by the waste liquid treatment device is discharged into the wet dust removal tank 100 through the air inlet pipe 101, and then the tail gas starts to move upward from the bottom of the liquid inside the wet dust removal tank 100. This process begins to filter solids such as catalyst dust, and then the filtered tail gas enters the high-efficiency filter 200 through the air outlet pipe 102, and then the tail gas is subjected to subsequent process treatment. When the liquid inside the wet dust removal tank 100 needs to be replaced, the water injection port 106 of the first end face 101 and the drain port 107 of the second end face are opened at the same time to start replacing the internal liquid, and there is no need to stop business to replace the internal liquid.

[0057] The advantage is that the machine can be operated without stopping. In the prior art, when the dust intercepted by the bag dust collector reaches a certain amount, it may block the exhaust gas passing efficiency, thus forming a certain pressure, which not only affects the exhaust gas treatment efficiency, but also affects the waste liquid treatment device at the front end, forcing it to stop operating for replacement. However, our invention does not require shutdown for operation. It only needs to open the water injection port 106 and the drainage port 107 of the wet dust removal tank 100 to circulate and replace the internal liquid. Moreover, the design advantage of the wet dust removal tank 100 is that the exhaust gas treatment efficiency can be adaptively adjusted according to the efficiency of the waste liquid treatment device. When the efficiency of the waste liquid treatment device is relatively high, the exhaust gas discharge rate into the wet dust removal tank 100 will increase, and then the pressure inside the wet dust removal tank 100 will increase, and the exhaust gas discharge rate from the outlet pipe 102 will also increase at the same time.

[0058] Example 3

[0059] Reference Figures 11-12 , which is the third embodiment of the present invention, further provides an exhaust gas filtration system, including an activated carbon storage tank 300 disposed between a wet dust removal tank 100 and a high efficiency filter 200.

[0060] Among them, an activated carbon storage tank 300 is provided between the wet dust removal tank 100 and the high-efficiency filter 200, which is used to absorb a small amount of unreacted small molecular organic gas, moisture, etc. in the exhaust gas.

[0061] The activated carbon storage tank 300 is filled with an activated carbon layer, and the volume of the activated carbon layer exceeds 90% of the volume of the activated carbon storage tank 300.

[0062] The volume of the activated carbon in the activated carbon storage tank 300 should account for more than 90% of the internal volume of the activated carbon storage tank 300, so as to prevent the bottom of the activated carbon from getting wet, otherwise the function of the activated carbon storage tank 300 will be reduced.

[0063] Preferably, the activated carbon storage tank 300 is externally connected to a gas pipeline 301 connected to the gas outlet pipeline 102 and an exhaust pipeline 302 connected to the high efficiency filter 200, and the gas pipeline 301 extends to the inside of the activated carbon layer.

[0064] Among them, the gas transmission pipeline 301 extends to the bottom of the activated carbon storage tank 300, and the exhaust pipeline 302 is attached to the upper inner wall of the activated carbon storage tank 300 on the lower surface inside the activated carbon storage tank 300, which makes it easier for the exhaust gas to be discharged from the activated carbon storage tank 300 after being filtered by the activated carbon.

[0065] It should be noted here that the above-mentioned activated carbon tank 300 is a stainless steel tank body filled with activated carbon.

[0066] The above-mentioned high efficiency filter 200 is a can-type glass fiber filter with a stainless steel shell, the top of which is an air inlet interface and the bottom of which is an air outlet.

[0067] The material was chosen to reduce the radiation exposure to workers when they change equipment.

[0068] The pipe joints of the wet dust removal tank 100, the activated carbon tank 300 and the high-efficiency filter 200 are designed as quick connectors, so that the activated carbon tank 300, the high-efficiency filter 200 and the hoses connected therebetween can be quickly replaced remotely through remote manipulator operation.

[0069] In summary, the activated carbon canister 300 can not only absorb some small molecules in the exhaust gas, but also solve the water vapor brought by the wet dust removal canister 100, thereby preventing dust from adhering to the inner wall of the equipment in the subsequent processing process, thereby affecting the subsequent processing efficiency.

[0070] The beneficial effects are:

[0071] 1. A radioactive aerosol filter device is added to the existing technology to further reduce the radioactive dose level of tail gas emissions, so that the organic radioactive waste liquid treatment device can be used to treat organic waste liquid with higher radioactive levels, while reducing the risk of excessive tail gas emissions;

[0072] 2. Reduce the risk of equipment shutdown and personnel exposure caused by equipment maintenance due to tail gas blockage in the existing tail gas system, while increasing the tail gas system's ability to filter radioactive aerosols, further reducing the radioactivity level in the tail gas to meet emission standards;

[0073] 3. Reduce the downtime losses caused by blockage of the exhaust system.

[0074] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0075] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention).

[0076] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An exhaust gas filtration system, characterized in that: include, A wet dust removal tank (100), wherein the wet dust removal tank (100) is connected to an exhaust port of a waste liquid treatment device, and the exhaust gas passes through the liquid inside the wet dust removal tank (100); The wet dust removal tank (100) is externally connected to a high-efficiency filter (200).

2. The exhaust gas filtration system according to claim 1, characterized in that: The wet dust removal tank (100) is externally connected to an air inlet pipe (101) and an air outlet pipe (102), and the air inlet pipe (101) extends to the interior of the wet dust removal tank (100); There is a height difference between the lower ends of the air inlet duct (101) and the air outlet duct (102), and the lower end of the air inlet duct (101) is closer to the bottom of the wet dust removal tank (100).

3. The exhaust gas filtration system according to claim 2, characterized in that: The wet dust removal tank (100) comprises a first end surface (103) close to the waste liquid treatment device and a second end surface (104) away from the other end of the first end surface (103); The air inlet pipe (101) and the air outlet pipe (102) are connected to the interior of the wet dust removal tank (100) from the first end surface (103).

4. The exhaust gas filtration system according to claim 2 or 3, characterized in that: The bottom radius of the wet dust removal tank (100) close to the second end surface (104) gradually decreases.

5. The exhaust gas filtration system according to claim 2 or 3, characterized in that: The outer wall of the wet dust removal tank (100) is connected to a transparent tube liquid level gauge (105).

6. The exhaust gas filtration system according to claim 4, characterized in that: The wet dust removal tank (100) is externally connected with a water injection port (106) and a water discharge port (107).

7. The exhaust gas filtration system according to claim 5, characterized in that: The water injection port (106) extends from the first end surface (101) to the interior of the wet dust removal tank (100), and the water discharge port (107) extends from the interior of the wet dust removal tank (100) to the exterior of the wet dust removal tank (100).

8. The exhaust gas filtration system according to claim 5, characterized in that: An activated carbon storage tank (300) is provided between the wet dust removal tank (100) and the high-efficiency filter (200).

9. The exhaust gas filtration system according to claim 6, characterized in that: The activated carbon storage tank (300) is filled with an activated carbon layer, and the volume of the activated carbon layer exceeds 90% of the volume of the activated carbon storage tank (300).

10. The exhaust gas filtration system according to claim 7, characterized in that: The activated carbon storage tank (300) is externally connected to a gas delivery pipeline (301) in communication with the gas outlet pipeline (102) and an exhaust pipeline (302) in communication with the high-efficiency filter (200), and the gas delivery pipeline (301) extends into the interior of the activated carbon layer.

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