Flue gas desulfurization and denitrification pretreatment device

Abstract

The utility model relates to the technical field of flue gas treatment, in particular to a flue gas desulfurization and denitrification pretreatment device which comprises a filtering tank and a confluence discharge pipe, the confluence discharge pipe is mounted in the direction of a gas outlet of the filtering tank, the filtering tank comprises a left tank and a right tank which are identical in structure and symmetrically arranged, and the tops of the left tank and the right tank are communicated to the top of the confluence discharge pipe in a confluence manner; the bottoms of the left tank and the right tank are fixedly communicated with an air inlet pipe of a Y-shaped structure, the top of the confluence discharge pipe is fixedly communicated with an air outlet pipe, and a temperature adjusting filter assembly is arranged in the filter tank; the temperature adjusting filtering assembly comprises a partition plate, a hollow annular plate, a spiral flow channel and a filtering cylinder, the partition plate is fixedly arranged at the bottom in the filtering tank, the hollow annular plate penetrating through the partition plate is fixedly installed at the bottom of the axis of the filtering tank, the spiral flow channel communicated with the interior of the hollow annular plate is fixedly installed at the bottom of the filtering tank, and the filtering cylinder is fixedly installed above the hollow annular plate; the problem that the filtering temperature of flue gas before desulfurization and denitrification is not suitable, a filter screen is easily damaged, and filtering is affected is solved.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically a flue gas desulfurization and denitrification pretreatment device. Background Technology

[0002] Flue gas typically contains a large amount of particulate matter that affects subsequent desulfurization and denitrification processes, such as metallic, carbon-based, or inorganic particles. Therefore, to protect the normal operation of desulfurization and denitrification equipment and improve processing efficiency, flue gas is usually filtered before desulfurization and denitrification. The initial temperature of flue gas is usually high; for example, the initial temperature of flue gas from waste incineration plants is 200-300°C, glass kilns have an initial temperature of 350-500°C, and chemical industry flue gas has an initial temperature of 200-400°C. Excessively high flue gas temperatures can easily damage filter structures, such as filter screens. Furthermore, excessively high temperatures can cause particulate matter to adhere to the filter structure surface, forming a hard shell, which can easily cause blockages, affecting filtration and damaging the filter screen.

[0003] Therefore, this utility model provides a flue gas desulfurization and denitrification pretreatment device to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing flue gas is filtered at an unsuitable temperature before desulfurization and denitrification, which easily damages the filter screen and affects filtration.

[0005] This utility model provides the following technical solution: a flue gas desulfurization and denitrification pretreatment device, including a filter tank and a combined discharge pipe. The combined discharge pipe is installed in the direction of the outlet of the filter tank. The filter tank includes a left tank and a right tank with the same structure and symmetrically arranged. The top of the left tank and the right tank are connected to the top of the combined discharge pipe. The bottom of the left tank and the right tank are fixedly connected to the inlet pipe with a Y-shaped structure. The top of the combined discharge pipe is fixedly connected to the outlet pipe. The filter tank is equipped with a temperature-regulating filter component.

[0006] The temperature-regulating filter assembly includes a baffle plate, a hollow ring plate, a spiral flow channel, and a filter cylinder. A baffle plate is fixedly installed at the bottom of the filter tank. A hollow ring plate that penetrates the baffle plate is fixedly installed at the bottom of the filter tank shaft. A spiral flow channel that connects to the inside of the hollow ring plate is fixedly installed at the bottom of the filter tank. A filter cylinder is fixedly installed above the hollow ring plate.

[0007] As an alternative, a confluence and discharge pipe is installed through the Y-shaped structure of the intake pipe, and a first heat-conducting fin is fixedly installed through the surface of the confluence and discharge pipe located inside the intake pipe.

[0008] As an alternative, a second heat-conducting fin is fixedly installed inside the spiral flow channel, extending through both ends.

[0009] As an alternative, the second heat-conducting fin is fixed along the axis of the hollow ring plate, with the second heat-conducting fin tilted towards the airflow direction.

[0010] As an alternative, a filter plate is fixedly installed at an angle on the inner wall of the top of the hollow ring plate.

[0011] As an alternative, a channel is left between the filter plate and the inner wall of the hollow ring plate.

[0012] As an alternative, multiple filter plates are installed alternately along the hollow ring plate.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model improves filtration efficiency by having flue gas enter two symmetrically connected filter canisters that lead to a confluence discharge pipe. After the flue gas enters the filter canister, the spiral flow channel and the second heat-conducting fins work together to adjust the temperature of the flue gas through heat exchange, preventing the flue gas temperature from being too high or too low and affecting filtration. Furthermore, as the flue gas flows along the spiral path, large particles that are not easily swayed by the air will gradually detach from the flue gas, which can also improve the cleanliness of the flue gas. In addition, the second heat-conducting fins, which are inclined to the airflow direction, collide with each other, thereby improving the heat exchange and temperature regulation efficiency.

[0015] 2. In this invention, after the flue gas passes through a spiral flow channel for temperature adjustment and simple filtration, it passes through a filter plate and filter cylinder with decreasing mesh diameter, thereby achieving stepwise filtration of particulate matter in the flue gas according to particle size, which helps to improve filtration efficiency. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a front view cross-sectional structural diagram of the filter tank of this utility model;

[0018] Figure 2 This utility model Figure 1 A magnified structural diagram of A in the middle;

[0019] Figure 3 This is a schematic diagram of the intake pipe in Embodiment 1 of this utility model;

[0020] Figure 4 This is a schematic diagram of the intake pipe in Embodiment 2 of this utility model.

[0021] In the diagram: 1. Filter tank; 2. Combined discharge pipe; 3. Inlet pipe; 4. Temperature-regulating filter assembly; 41. Baffle plate; 42. Hollow ring plate; 43. Spiral flow channel; 44. Filter cylinder; 45. Second heat-conducting fin; 46. Filter plate; 47. Channel; 5. First heat-conducting fin. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this utility model is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for 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; therefore, they should not be construed as limitations on this utility model.

[0025] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 according to the specific circumstances.

[0026] Based on the existing problem that unsuitable filtration temperatures before desulfurization and denitrification of flue gas can easily damage the filter screen and affect filtration, such as... Figures 1 to 3As shown, this embodiment of the present disclosure provides a flue gas desulfurization and denitrification pretreatment device, including a filter tank 1 and a combined discharge pipe 2. The combined discharge pipe 2 is installed in the direction of the outlet of the filter tank 1. The filter tank 1 includes a left tank and a right tank with the same structure and symmetrically arranged. The top of the left tank and the right tank are combined and connected to the top of the combined discharge pipe 2. The bottom of the left tank and the right tank are fixedly connected to the inlet pipe 3 with a Y-shaped structure. The bottom of the combined discharge pipe 2 is fixedly connected to the outlet pipe. The filter tank 1 is equipped with a temperature regulating filter assembly 4.

[0027] like Figure 1 and 2 As shown, the temperature-regulating filter assembly 4 includes a partition 41, a hollow ring plate 42, a spiral flow channel 43, and a filter cylinder 44. The partition 41 is fixedly installed at the bottom of the filter tank 1. The hollow ring plate 42, which penetrates the partition 41, is fixedly installed at the bottom of the filter tank 1. The spiral flow channel 43, which connects to the inside of the hollow ring plate 42, is fixedly installed at the bottom of the filter tank 1. The filter cylinder 44 is fixedly installed above the hollow ring plate 42.

[0028] Before flue gas desulfurization and denitrification, the flue gas is first filtered by filter tank 1 and combined discharge pipe 2. The flue gas is first diverted into two symmetrical filter tanks 1 along the Y-shaped inlet pipe 3 for filtration, thereby improving the filtration efficiency. After filtration, the flue gas is combined into the combined discharge pipe 2 for transportation and discharge.

[0029] During the filtration process of flue gas entering the filter canister 1, the flue gas first flows through the spiral flow channel 43 from the inlet pipe 3. As the flue gas flows through the spiral flow channel 43, on the one hand, the temperature of the flue gas is adjusted by heat exchange through the temperature regulating medium between the filter canister 1 and the baffle 41, preventing the flue gas temperature from being too high or too low and affecting filtration; on the other hand, as the flue gas flows along the spiral path, large particles that are difficult to deflect with the air gradually detach from the flue gas, thereby improving the cleanliness of the flue gas. After the flue gas flows along the spiral flow channel 43 and enters the hollow ring plate 42, it passes through the filter cylinder 44 for filtration. This allows the filtered, particle-free flue gas to penetrate the filter cylinder 44 and merge from the top of the filter canister 1 into the merging discharge pipe 2. The particulate impurities intercepted by the filter cylinder 44 fall within the hollow ring plate 42 and are discharged from the bottom of the filter canister 1.

[0030] It should be noted that in this embodiment, the particles detached from the flue gas mainly converge at the junction of the spiral channel 43 and the hollow ring plate 42. In this embodiment, a detachable installation window at the junction of the spiral channel 43 and the hollow ring plate 42 facilitates subsequent cleaning and removal of the particles. Alternatively, any other structure that facilitates particle removal can be used.

[0031] It should be noted that in this embodiment, the temperature regulating medium is water. Water is used to cool or heat the flue gas, thereby regulating the flue gas temperature and avoiding damage to the filter screen, dust adhesion, condensation, and reduced flowability caused by excessively high or low flue gas temperature, which would affect the filtration efficiency.

[0032] It should be noted that flue gas needs to be filtered to remove particulate matter before desulfurization and denitrification to ensure equipment safety, improve reaction efficiency, control operating costs, and avoid secondary pollution. However, excessively high flue gas temperatures can easily damage the filter screen, and the high temperature can also cause dust to adhere to the filter screen surface, forming a hard shell that affects filtration. Therefore, cooling is necessary before filtration to ensure filtration effectiveness.

[0033] like Figure 1 and 2 As shown, a second heat-conducting fin 45 with both ends passing through is fixedly installed inside the spiral flow channel 43.

[0034] The second heat-conducting fin 45 facilitates the heat exchange and temperature adjustment of the flue gas by the temperature-regulating medium between the filter canister 1 and the baffle 41, thereby improving the temperature regulation effect of the flue gas in the spiral flow channel 43, thus avoiding damage to the filter cartridge 44 due to excessively high flue gas temperature and avoiding dust adhesion caused by excessively high flue gas temperature, which affects the filtration efficiency.

[0035] like Figure 1 and 2 As shown, the second heat-conducting fin 45 is fixed along the axis of the hollow annular plate 42, and the second heat-conducting fin 45 is inclined to face the airflow direction. During the flow of flue gas along the spiral channel 43, it can collide with the second heat-conducting fin 45 inclined to face the airflow direction, thereby increasing fluid turbulence and enhancing convective heat transfer, forming turbulence and impingement flow on the fin surface. This intensifies the lateral mixing of fluid molecules, reduces the boundary layer thickness, and thus accelerates the rate of heat transfer from the fin.

[0036] like Figure 1 and 2 As shown, a filter plate 46 is fixedly installed at an angle on the inner wall of the top of the hollow ring plate 42.

[0037] After the flue gas passes through the spiral flow channel 43 for temperature adjustment and to cause the sedimentation of large particles that are difficult to deflect, the flue gas enters the hollow ring plate 42 and flows upward through the filter cylinder 44. During this process, the flue gas first passes through the inclined and fixed filter plate 46, which performs preliminary filtration of coarse particles. The intercepted impurities fall down along the hollow ring plate 42 for subsequent discharge. Furthermore, the inclined filter plate 46 increases the filtration area, which is beneficial for improving filtration efficiency. At the same time, particulate impurities are less likely to accumulate and can fall down along the surface of the filter plate 46 for discharge.

[0038] The mesh diameters of the filter plate 46 and filter cylinder 44 decrease along the airflow direction.

[0039] The combination of filter plate 46 and filter cylinder 44 enables the stepwise filtration of particulate matter in flue gas according to particle size, thereby improving filtration efficiency.

[0040] The specific processing procedure in this embodiment of the disclosure is as follows:

[0041] Before desulfurization and denitrification of the flue gas, the flue gas is first diverted into the spiral flow channels 43 in the two symmetrical filter tanks 1 through the Y-shaped inlet pipe 3. During the flow of the flue gas in the spiral flow channels 43, the temperature of the flue gas can be adjusted by heat exchange through the temperature regulating medium between the filter tank 1 and the baffle 41, so as to avoid the flue gas temperature being too high or too low and affecting the filtration. In addition, during the flow of the flue gas along the spiral, impurities with large particle size that are not easy to change direction with the air will gradually be removed from the flue gas, thereby improving the cleanliness of the flue gas. At the same time, the flue gas will also collide with the second heat-conducting fins 45 inclined to the air flow direction during the flow process, thereby increasing fluid disturbance and enhancing convective heat transfer, forming turbulence and impact flow on the fin surface, which intensifies the lateral mixing of fluid molecules, reduces the boundary layer thickness, and thus accelerates the heat transfer rate from the fins, thereby improving the temperature regulation effect of the flue gas.

[0042] After exiting the spiral flow channel 43, the flue gas enters the hollow ring plate 42 and flows towards the top of the filter canister 1, where it connects to the confluence discharge pipe 2. During its upward flow, the flue gas first undergoes coarse filtration through the filter screen. The intercepted impurities fall along the hollow ring plate 42 for subsequent discharge. Furthermore, the inclined filter plate 46 increases the filtration area, which is beneficial for improving filtration efficiency. Thus, through the cooperation of the filter plate 46 (with mesh sizes larger than the filter cylinder 44) and the filter cylinder 44, particulate matter in the flue gas is filtered progressively according to particle size, thereby improving filtration efficiency.

[0043] Example 2: As Figure 4 As shown, for the process of denitrification after flue gas filtration, in this embodiment of the present disclosure, a confluence discharge pipe 2 is installed through the Y-shaped structure of the air inlet pipe 3, and a first heat-conducting fin 5 is fixedly installed through the surface of the confluence discharge pipe 2 located in the air inlet pipe 3.

[0044] During the process of flue gas flowing into the filter tank 1 through the inlet pipe 3 for filtration, the flue gas in the inlet pipe 3 can heat the filtered flue gas in the confluence discharge pipe 2. Thus, the flue gas before filtration and temperature adjustment is used to heat the filtered and temperature-adjusted flue gas. On the one hand, this can lower the temperature of the flue gas before filtration to facilitate filtration, prevent damage to the filter cartridge 44, and prevent dust adhesion caused by high-temperature flue gas from affecting filtration. On the other hand, it can also raise the temperature of the filtered flue gas, making it easier to adapt to the subsequent denitrification process, thereby saving energy and reducing costs.

[0045] It should be noted that for processes where desulfurization is performed after filtration, the combined discharge pipe 2 does not pass through the inlet pipe 3 for heating.

[0046] Example 3: As Figure 1 and 2 As shown, a channel 47 is left between the filter plate 46 and the inner wall of the hollow ring plate 42.

[0047] The filter plate 46 with channel 47 is mainly for partial filtration of flue gas, thereby reducing the load on the filter cartridge 44 and lowering the filtration pressure. On the other hand, when the filter plate 46 is blocked, the filter plate 46 with channel 47 can still ensure the flow of flue gas for subsequent filtration.

[0048] It should be noted that in this embodiment, the filter plate 46 is mainly for filtering part of the flue gas rather than all of the flue gas. It is used to assist the filter cartridge 44 in filtering, thereby reducing the filtration pressure on the filter cartridge 44.

[0049] like Figure 1 and 2 As shown, multiple filter plates 46 are installed alternately along the hollow ring plate 42.

[0050] The staggered installation of multiple filter plates 46 allows the flue gas to come into contact with the filter plates 46 multiple times during the flow process, and the staggered filter plates 46 can cooperate with each other, so that the entire flue gas can be filtered without being blocked, thus improving the filtration effect of the flue gas.

[0051] 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 illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A flue gas desulfurization and denitrification pretreatment device, comprising a filter tank (1) and a combined discharge pipe (2), wherein the combined discharge pipe (2) is installed in the direction of the outlet of the filter tank (1), characterized in that: The filter canister includes a left canister and a right canister arranged symmetrically with the same structure. The top of the left and right canisters merge and connect to the top of the merged discharge pipe (2). The bottom of the left and right canisters are fixedly connected to the air inlet pipe (3) with a Y-shaped structure. The top of the merged discharge pipe (2) is fixedly connected to the air outlet pipe. The filter canister (1) is equipped with a temperature-regulating filter assembly (4). The temperature-controlled filter assembly (4) includes a partition (41), a hollow ring plate (42), a spiral flow channel (43), and a filter cylinder (44). The partition (41) is fixedly installed at the bottom of the filter tank (1). The hollow ring plate (42) that penetrates the partition (41) is fixedly installed at the bottom of the filter tank (1). The spiral flow channel (43) that connects to the inside of the hollow ring plate (42) is fixedly installed at the bottom of the filter tank (1). The filter cylinder (44) is fixedly installed above the hollow ring plate (42).

2. The flue gas desulfurization and denitrification pretreatment device according to claim 1, characterized in that: A confluence discharge pipe (2) is installed through the Y-shaped structure of the intake pipe (3), and a first heat-conducting fin (5) is fixedly installed through the surface of the confluence discharge pipe (2) located inside the intake pipe (3).

3. The flue gas desulfurization and denitrification pretreatment device according to claim 1, characterized in that: A second heat-conducting fin (45) with both ends through is fixedly installed inside the spiral flow channel (43).

4. The flue gas desulfurization and denitrification pretreatment device according to claim 3, characterized in that: The second heat-conducting fin (45) is fixed along the axis of the hollow ring plate (42), and the second heat-conducting fin (45) is inclined to face the air flow direction.

5. The flue gas desulfurization and denitrification pretreatment device according to claim 1, characterized in that: A filter plate (46) is fixedly installed on the top inner wall of the hollow ring plate (42) at an angle.

6. The flue gas desulfurization and denitrification pretreatment device according to claim 5, characterized in that: A channel (47) is left between the filter plate (46) and the inner wall of the hollow ring plate (42).

7. The flue gas desulfurization and denitrification pretreatment device according to claim 5, characterized in that: Multiple filter plates (46) are staggered along the hollow ring plate (42).

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