Slurry pipeline line structure and flue gas treatment system using same

Abstract

The application relates to the technical field of garbage incineration treatment, in particular to a slurry pipeline line structure and a flue gas treatment system applying the same. The slurry pipeline line structure comprises a first slurry pipeline structure, which comprises a main pipeline and a U-shaped pipeline arranged upwardly and protruding; the top of the U-shaped pipeline is higher than the main pipeline, two pipeline ports of the U-shaped pipeline downwardly protruding are connected with two pipeline interfaces on one side of the main pipeline, a loop is formed, and at least one branch pipeline connected with an atomizer is arranged on the main pipeline. The slurry pipeline line structure and the flue gas treatment system applying the same improve the stability of atomizer operation and solve the technical problem of slurry breakage of the atomizer.

Description

Technical Field

[0001] This application relates to the field of waste incineration technology, and in particular to a slurry pipeline structure and a flue gas treatment system using the same. Background Technology

[0002] Waste-to-energy incineration is an important means of reducing, rendering harmless, and recycling municipal solid waste. However, its combustion process produces complex flue gas containing acidic gases such as HCl, SO2, and NOx, particulate matter, heavy metals, and dioxins. To meet the stringent emission requirements of the "Standard for Pollution Control of Municipal Solid Waste Incineration" (GB 18485-2014) and EU Directive 2010 / 75 / EU, modern incineration plants generally adopt a multi-stage purification process of "SNCR denitrification + semi-dry deacidification + activated carbon adsorption + bag filter".

[0003] In semi-dry acid removal systems, lime slurry (Ca(OH)2 suspension) is atomized into micron-sized droplets by a high-speed rotating atomizer, which reacts with acidic components in the flue gas via a gas-liquid reaction (e.g., 2HCl + Ca(OH)2 → CaCl2 + 2H2O), achieving efficient neutralization. This process has become the mainstream choice due to its high reaction efficiency (acid removal rate > 95%) and moderate investment cost. However, the reliability of the core equipment, the atomizer, and its supporting slurry delivery system directly affects the environmental compliance rate and operational economy. Stable slurry supply (e.g., flow fluctuation < 5%) and uniform atomization of the atomizer are prerequisites for efficient acid removal reactions. The performance of the atomizer directly affects the flue gas purification effect and equipment lifespan, making it one of the core control nodes of the semi-dry acid removal system.

[0004] However, it was found that when using the return valve to adjust the slurry, the flow rate of lime slurry and the valve opening are not always linearly related. When the valve opening is low, the valve opening has little effect on the lime slurry flow rate. When the valve opening reaches 25% or 45%, a surge in lime slurry flow occurs. When the valve opening reaches 70%, the effect of the valve opening on the lime slurry flow rate remains almost unchanged. Therefore, when using the return valve to regulate the slurry, it is easy to adjust the opening too much, causing a sharp increase in lime slurry flow, resulting in insufficient slurry supplied to the atomizer and causing the atomizer to run out of slurry.

[0005] A sudden interruption of lime slurry can damage the atomizer. This loss of atomizing medium causes the atomizer to lose its atomizing medium, and the reverse conduction of high-temperature flue gas (150℃~220℃) causes a rapid rise in the atomizer's temperature. Under sustained temperatures above 150℃, the sealing silicone rubber components undergo thermal aging, increasing hardness by 15%~20%, compressive strength exceeding 50%, and shortening service life to one-third of normal operation. Furthermore, it can lead to the risk of uncontrolled environmental parameters, as blockage or slurry interruption can cause a sudden drop in deacidification efficiency (measured SO2 emission concentration drops instantaneously). The concentration can spike from 35 mg / Nm³ to 250 mg / Nm³, exceeding the 50 mg / Nm³ limit. More seriously, atomization failure can lead to uneven humidity distribution in the flue gas, a 30% reduction in activated carbon injection adsorption efficiency, and a risk of dioxin concentration exceeding the standard. Furthermore, uneven liquid supply due to pipe blockage or slurry interruption can directly cause: ① droplet coarsening (diameter > 150 μm), reducing reaction efficiency; ② dynamic imbalance of the atomizing disc, inducing mechanical vibration; ③ cooling interruption, high temperature damage to sealing components.

[0006] The current industry standard solution for the problem of slurry interruption in atomizers is to use a backup slurry storage and dispensing system. When the pipeline fails, the system can switch to the backup route in time to ensure slurry supply. The specific implementation of this technical solution includes setting up a limestone slurry tank on the supply system, with two limestone slurry tanks serving as backups for each other. At the same time, an electric valve is added to the original limestone slurry inlet pipe so that when one pipeline fails, the pipeline can be switched in time to ensure slurry supply.

[0007] This solution ensures a stable supply of lime slurry to the pipeline by replacing the pipes or the storage tank. However, this solution does not fundamentally solve the problem; it is merely a stopgap measure. Furthermore, in practical applications, this supply method cannot guarantee that the backup line will be operational, and the equipment replacement, cleaning, and maintenance costs associated with this solution are relatively high. Utility Model Content

[0008] The purpose of this application is to provide a slurry pipeline structure and a flue gas treatment system using the same, so as to solve the technical problem of slurry interruption in atomizers.

[0009] In a first aspect, the present application provides a slurry pipeline structure, including a first slurry pipeline structure, which includes a main pipeline and an upwardly protruding U-shaped pipeline.

[0010] The top of the U-shaped pipe is higher than the main pipe. The two downward-extending pipe ports of the U-shaped pipe are connected to two pipe interfaces on one side of the main pipe to form a loop. The main pipe is provided with at least one branch pipe connected to the atomizer.

[0011] Furthermore, the U-shaped pipe includes a bend at the top and two straight pipe sections extending downwards that connect to the opposite ends of the bend.

[0012] The pipe ports of the two straight pipe sections are respectively welded and fixed to the two pipe interfaces of the main pipe through two connecting bends.

[0013] Furthermore, the height of the straight pipe section is between 2000 and 5000 mm.

[0014] Furthermore, both the return bend and the connecting bend are arc-shaped structures, with the return bend being a semi-circular structure and the connecting bend being a quarter-circular structure.

[0015] The radius of the bend and / or the connecting bend is between 180 and 1000 mm.

[0016] Furthermore, the wall thickness of the bend and / or the connecting bend is greater than the wall thickness of the straight section.

[0017] Furthermore, the slurry pipeline structure has a circular cross-section with a diameter of 89mm, the wall thickness of the bend and / or the connecting bend is 6mm, and the wall thickness of the straight section is 4.5mm.

[0018] Furthermore, a flange gasket is installed at different positions on the two straight pipe sections of the U-shaped pipe, with one flange gasket installed near the upper end of one straight pipe section and the other flange gasket installed near the lower end of the other straight pipe section.

[0019] Furthermore, the slurry pipeline structure also includes a second slurry pipeline structure symmetrical to the first slurry pipeline structure, wherein the first slurry pipeline structure and the second slurry pipeline structure serve as backup lines for each other.

[0020] The first main pipe of the first slurry pipe structure and the second main pipe of the second slurry pipe structure are arranged vertically at intervals, and the second main pipe is provided with at least one branch pipe connected to the atomizer.

[0021] The first U-shaped pipe of the first slurry pipe structure is connected to two pipe interfaces on one side of the first main pipe, and the second U-shaped pipe of the second slurry pipe structure is connected to two pipe interfaces on the other side of the second main pipe.

[0022] Furthermore, the inlet end of the first main pipe of the first slurry pipe structure and the inlet end of the second main pipe of the second slurry pipe structure are connected to the slurry inlet pipe, and the slurry inlet pipe is equipped with a slurry inlet valve.

[0023] The first slurry pipeline structure has a first slurry return valve at the outlet end of the first main pipeline, and the second slurry pipeline structure has a second slurry return valve at the outlet end of the second main pipeline.

[0024] Secondly, the flue gas treatment system provided in this application includes the slurry pipeline structure described in any one of the preceding claims.

[0025] Compared with existing technologies, this application provides a slurry pipeline structure and a flue gas treatment system using the same. This slurry pipeline structure adds an upwardly protruding U-shaped pipe to one side of the existing main pipeline. The top of the U-shaped pipe is higher than the main pipeline, protruding upwards to one side of the main pipeline. The main pipeline also has at least one branch pipe connecting to an atomizer. Utilizing the principle of static pressure difference, the U-shaped pipe provides a buffer when there are large fluctuations in the slurry flow rate inside the pipeline. This prevents excessive changes in the slurry operation during atomizer operation, greatly improving the stability of atomizer operation, solving the problem of atomizer slurry interruption, reducing the impact on the flue gas treatment system caused by excessive fluctuations in slurry flow rate due to improper control of the slurry return valve, and lowering maintenance and repair costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or 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 application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the slurry pipeline structure provided in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the U-shaped pipe provided in the embodiment of this application;

[0029] Figure 3 for Figure 2 The AA section view shown;

[0030] Figure 4 for Figure 2 The BB cross-sectional view shown.

[0031] Figure label:

[0032] 10-Structure of the first slurry pipeline;

[0033] 11-First U-shaped pipe;

[0034] 111-return section;

[0035] 112 - Straight pipe section;

[0036] 12-First main pipeline;

[0037] 121 - First branch pipe;

[0038] 122 - First liquid inlet end;

[0039] 13-Connecting bend;

[0040] 14-Flange gasket;

[0041] 20-Second slurry pipeline structure;

[0042] 21-Second U-shaped pipe;

[0043] 22-Second main pipeline;

[0044] 221 - Second branch pipe;

[0045] 222 - Second liquid inlet end;

[0046] 30 - Grout inlet pipe;

[0047] 31-Inlet valve;

[0048] 41-First return slurry valve;

[0049] 42 - Second return valve. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0052] 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.

[0053] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," 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 commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0055] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "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 application based on the specific circumstances.

[0056] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0057] like Figures 1 to 2 As shown in the figure, this application provides a slurry pipeline structure and a flue gas treatment system using the same, which can effectively prevent the atomizer from cutting off the slurry supply.

[0058] like Figure 1 As shown, the slurry pipeline structure includes at least a first slurry pipeline structure 10. The first slurry pipeline structure 10 includes a main pipeline (i.e., the first main pipeline 12) and an upwardly protruding U-shaped pipeline (i.e., the first U-shaped pipeline 11). The top of the U-shaped pipeline is higher than the main pipeline. The two downwardly extending pipe ports of the U-shaped pipeline are connected to two pipe interfaces on one side of the main pipeline to form a loop. The main pipeline is provided with at least one branch pipeline (i.e., the first branch pipeline 121) for connecting the atomizer.

[0059] Compared with existing technologies, the present application provides a slurry pipeline structure and a flue gas treatment system using the same. This slurry pipeline structure adds an upwardly protruding U-shaped pipe to one side of the original main pipeline. The top of the U-shaped pipe is higher than the main pipeline, protruding upwards to one side of the main pipeline. The main pipeline also has at least one branch pipe connected to an atomizer. Utilizing the principle of static pressure difference, the U-shaped pipe provides a buffer when there are large fluctuations in the slurry flow rate inside the pipeline. This prevents excessive changes in the slurry operation during atomizer operation, greatly improving the stability of atomizer operation, solving the problem of atomizer slurry interruption, reducing the impact on the flue gas treatment system caused by excessive fluctuations in slurry flow rate due to improper control of the slurry return valve, and lowering maintenance and repair costs.

[0060] Furthermore, such as Figure 2 As shown, the aforementioned U-shaped pipe may specifically include a bend 111 at the top and two straight pipe sections 112 extending downwards and connected to the opposite ends of the bend 111. The bend 111 has an arc-shaped structure, specifically a semi-circular structure, and the radius R of the bend 111 is between 180 and 1000 mm.

[0061] In one specific embodiment, the pipe ports of the two straight pipe sections 112 can be welded and fixed to the two pipe interfaces of the aforementioned main pipe through two connecting bends 13, which makes the welding reliable and facilitates construction.

[0062] More specifically, the two bends 111 are also arc-shaped structures, specifically quarter-circle structures, which can connect two straight pipe structures that are perpendicular to each other, such as connecting straight pipe section 112 with a horizontally set main pipe. Specifically, the radius R of the bend 111 is between 180 and 1000 mm.

[0063] In a preferred embodiment, the height of the straight pipe section 112 of the U-shaped pipe is between 2000 and 5000 mm. This straight pipe section is installed vertically, and its length L is its height. The height of the U-shaped pipe can be appropriately increased or decreased according to the actual site conditions. Where conditions permit, the higher the height, the stronger the buffering performance provided by the U-shaped pipe, the better the stability of the atomizer operation, and the more effectively the problem of atomizer slurry interruption is solved, resulting in better performance. Specifically, the length L of the straight pipe section 112 can be 3000 mm. This embodiment uses a length L of 3000 mm as an example for illustration.

[0064] In a more preferred embodiment, the wall thickness of the U-shaped pipe bend 111 and the connecting bend 13 can be greater than the wall thickness of the straight section 112 of the U-shaped pipe, thereby improving the pipe strength at the bend and enhancing its resistance.

[0065] One specific embodiment is as follows: Figures 2 to 4 As shown, the length L of the straight pipe section 112 of the U-shaped pipe is 3000mm, the cross-section of the slurry pipeline is circular, and the bend section 111 and the connecting bend 13 are as follows: Figure 3 The Φ89*6 specification shown refers to the fact that the bend 111 and the connecting bend 13 have a diameter of 89mm and a wall thickness of 6mm. The straight pipe section 112 uses... Figure 4 The Φ89*4.5 specification shown indicates that the straight pipe section 112 has a diameter of 89mm and a wall thickness of 4.5mm. This is to facilitate the installation of the U-shaped pipe. Specifically, the straight pipe section 112 can be a straight steel pipe, and the connecting bend 13 can be an elbow.

[0066] like Figure 1 and Figure 2 As shown, in one optional embodiment, a flange gasket 14 can be installed at different locations on the two straight pipe sections 112 of the U-shaped pipe for connection. One flange gasket 14 is installed near the upper end of one straight pipe section 112, and the other flange gasket 14 is installed near the lower end of the other straight pipe section 112. This facilitates the maintenance, cleaning, disassembly, and installation of the U-shaped pipe.

[0067] To further ensure the safe use and normal operation of the slurry pipeline structure, a preferred embodiment is as follows: Figure 1 As shown, the slurry pipeline structure provided in this application embodiment may further include a second slurry pipeline structure 20. The second slurry pipeline structure 20 and the first slurry pipeline structure 10 serve as backup lines for each other, with one in use and one in standby, to further ensure safe use and normal operation, prevent the occurrence of sudden accidents, and improve the stability of the overall flue gas treatment system.

[0068] Specifically, such as Figure 1 As shown, the second slurry pipe structure 20 is symmetrically arranged with the first slurry pipe structure 10. The first main pipe 12 of the first slurry pipe structure 10 and the second main pipe 22 of the second slurry pipe structure 20 can be arranged vertically and horizontally to avoid each other. The second main pipe 22 is provided with at least one branch pipe (i.e., the second branch pipe 221) connected to the atomizer.

[0069] The first U-shaped pipe 11 of the first slurry pipe structure 10 is connected to two pipe interfaces on one side of the first main pipe 12, and the second U-shaped pipe 21 of the second slurry pipe structure 20 is connected to two pipe interfaces on the other side of the second main pipe 22. They are arranged to avoid each other and are reasonably arranged.

[0070] like Figure 1 As shown, the inlet end (i.e., the first inlet end 122) of the first main pipe 12 of the first slurry pipeline structure 10 and the inlet end (i.e., the second inlet end 222) of the second main pipe 22 of the second slurry pipeline structure 20 are connected to the slurry inlet pipe 30, and the slurry inlet pipe 30 is equipped with a slurry inlet valve 31. Furthermore, the outlet end of the first main pipe 12 of the first slurry pipeline structure 10 is equipped with a first slurry return valve 41, and the outlet end of the second main pipe 22 of the second slurry pipeline structure 20 is equipped with a second slurry return valve 42. This achieves the functions of slurry inlet and slurry return. Figure 1 The direction indicated by the middle arrow is the direction of slurry flow inside the pipe.

[0071] Preferably, the slurry inlet pipe 30 and the slurry return valve (including the first slurry return valve 41 and the second slurry return valve 42) are located downstream of the main pipe (including the first main pipe 12 and the second main pipe 22) to further increase the height difference.

[0072] Optionally, the slurry pipeline structure provided in this application embodiment undergoes a periodic maintenance switch every once in a while to reduce the excessive impact of lime slurry scaling on the inner wall of the pipeline on the normal flow of the slurry inside the pipeline.

[0073] Optionally, the exposed parts of the pipes can be painted to seal and protect them, reducing the impact of external rust on the pipe route.

[0074] One possible installation procedure for the slurry pipeline structure provided in the embodiments of this application is as follows:

[0075] Step 1: Weld two straight steel pipes (straight pipe section 112) with a ф89*4.5mm bend (connecting bend 13) to form a corresponding U-shaped pipe, and weld a flange interface at the connection of the U-shaped pipe, specifically using a flange gasket 14; In particular, pay attention to strengthening the welding of the connection part to avoid leakage due to incomplete welding.

[0076] Step 2: First, switch the grout pipeline to the standby pipeline, isolate the pipeline to be constructed, cut off the original pipeline (main pipeline), and weld the connecting elbow (connecting bend 13) to the flange.

[0077] Step 3: Connect the welded U-shaped pipe to the shut-down slurry pipe through a flange, and switch the slurry pipe to the modified route for trial operation; check the actual operation of the modified pipeline, and if pipeline leakage is encountered, take timely remedial measures. At the same time, observe the flow of lime slurry during trial operation for a period of time.

[0078] Step 4: Repeat steps 1 to 3 on the other side of the backup line (i.e., the second slurry pipe structure 20) to complete the installation.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A slurry pipeline structure, characterized in that, It includes a first slurry pipeline structure, which includes a main pipeline and an upwardly projecting U-shaped pipeline; The top of the U-shaped pipe is higher than the main pipe. The two downward-extending pipe ports of the U-shaped pipe are connected to two pipe interfaces on one side of the main pipe to form a loop. The main pipe is provided with at least one branch pipe connected to the atomizer.

2. The slurry pipeline structure according to claim 1, characterized in that, The U-shaped pipe includes a bend at the top and two straight pipe sections extending downwards that connect to the opposite ends of the bend. The pipe ports of the two straight pipe sections are respectively welded and fixed to the two pipe interfaces of the main pipe through two connecting bends.

3. The slurry pipeline structure according to claim 2, characterized in that, The height of the straight pipe section is between 2000 and 5000 mm.

4. The slurry pipeline structure according to claim 2, characterized in that, Both the return bend and the connecting bend are arc-shaped structures, with the return bend being a semi-circular structure and the connecting bend being a quarter-circular structure. The radius of the bend and / or the connecting bend is between 180 and 1000 mm.

5. The slurry pipeline structure according to claim 4, characterized in that, The wall thickness of the bend and / or the connecting bend is greater than the wall thickness of the straight section.

6. The slurry pipeline structure according to claim 5, characterized in that, The slurry pipeline structure has a circular cross-section with a diameter of 89mm. The wall thickness of the bend and / or the connecting bend is 6mm, and the wall thickness of the straight section is 4.5mm.

7. The slurry pipeline structure according to claim 2, characterized in that, A flange gasket is installed at different positions on the two straight pipe sections of the U-shaped pipe. One flange gasket is installed near the upper end of one straight pipe section, and the other flange gasket is installed near the lower end of the other straight pipe section.

8. The slurry pipeline structure according to any one of claims 1 to 7, characterized in that, It also includes a second slurry pipeline structure that is symmetrical to the first slurry pipeline structure, and the first slurry pipeline structure and the second slurry pipeline structure serve as backup lines for each other; The first main pipe of the first slurry pipe structure and the second main pipe of the second slurry pipe structure are arranged vertically at intervals, and the second main pipe is provided with at least one branch pipe connected to the atomizer. The first U-shaped pipe of the first slurry pipe structure is connected to two pipe interfaces on one side of the first main pipe, and the second U-shaped pipe of the second slurry pipe structure is connected to two pipe interfaces on the other side of the second main pipe.

9. The slurry pipeline structure according to claim 8, characterized in that, The inlet end of the first main pipe of the first slurry pipeline structure and the inlet end of the second main pipe of the second slurry pipeline structure are connected to the slurry inlet pipe, and the slurry inlet pipe is equipped with a slurry inlet valve; The first slurry pipeline structure has a first slurry return valve at the outlet end of the first main pipeline, and the second slurry pipeline structure has a second slurry return valve at the outlet end of the second main pipeline.

10. A flue gas treatment system, characterized in that, The slurry pipeline structure includes any one of claims 1 to 9.

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