A large-section flue that is easy to block and a method for blocking the large-section flue

Abstract

The present invention provides a large-section flue that is easy to block and a method for blocking the large-section flue. The large-section flue that is easy to block comprises a flue side wall (1), a plane grid frame (2) is arranged inside the flue side wall (1), the plane grid frame (2) is connected and fixed to the flue side wall (1), and the plane where the plane grid frame (2) is located is vertically arranged or inclined relative to the extension direction of the flue side wall (1). The large-section flue that is easy to block can meet the normal production process by adding a simple plane grid frame inside the flue. The plane grid frame does not need to be removed and does not affect production. During the production and maintenance process, it assists in manually building a blocking surface to quickly complete the complete blocking of the flue. When the maintenance personnel have complete labor protection equipment, the safety of the maintenance personnel inside the flue is ensured. After the maintenance is completed, the blockage is removed and the flue returns to normal, without affecting the production process.

Description

Technical Field

[0001] The invention relates to a flue with a large cross section which is easy to block, and also relates to a method for blocking the flue with a large cross section. Background Art

[0002] During the production process, there are many large-section smoke and air ducts that need to be temporarily blocked, such as two flues sharing a common exhaust port, two or more flues in the process system, temporary backup ducts, and the owner's explicit request for a backup system, etc. If one of the flues and its equipment needs to be repaired and maintained, measures must be taken to completely isolate the flue from the system to create conditions for personnel to enter the interior for maintenance.

[0003] Generally, in this case, dampers, valves and other equipment are used for partitioning. However, the cross-sectional area of ​​the flue is too large, and dampers and valves need to be specially designed or expensive professional equipment. However, such partition devices are rarely used or the working environment is extremely harsh. Even if expensive equipment is purchased, the equipment itself has a certain leakage rate and cannot be completely sealed and blocked. In addition, the frequency of use is extremely low, the maintenance is poor, and the working environment is extremely harsh, so the equipment cannot operate stably for a long time. Summary of the invention

[0004] In order to solve the problem of blocking a large-section flue, the present invention provides a large-section flue that is easy to block and a blocking method for a large-section flue. The large-section flue that is easy to block can meet the normal production process by adding a simple flat grille frame in the flue. The flat grille frame does not need to be removed and does not affect production. During the production and maintenance process, it assists in manually building a blocking surface to quickly complete the complete blocking of the flue. When the maintenance personnel have complete labor protection facilities, the safety of the maintenance personnel inside the flue is ensured. After the maintenance is completed, the blockage is removed and the flue returns to normal, without affecting the survival process. The blocking method for a large-section flue can be simple, fast, safe, and reliable, and at the same time, the implementation cost is low, the work intensity of workers is low, and it is more feasible.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A large-section flue that is easy to block comprises a flue side wall, wherein a plane grid frame is arranged inside the flue side wall, the plane grid frame is connected and fixed to the flue side wall, and the plane where the plane grid frame is located is vertically or inclined relative to the extension direction of the flue side wall.

[0007] The plane where the plane grid frame is located is vertically arranged relative to the extension direction of the flue side wall, and the edge of the plane grid frame is welded to the inner surface of the flue side wall.

[0008] The plane grid frame contains a plurality of grid through holes. On the cross section of the large cross-section flue that is easy to block, the total area of ​​the grid through holes is 70%-90% of the flow area of ​​the flue side wall.

[0009] A support rod is also arranged in the side wall of the flue. The support rod is located on the leeward side of the plane grid frame. The support rod is connected and fixed to the side wall of the flue and the plane grid frame.

[0010] A blocking surface is also provided in the flue side wall, the edge of the blocking surface is matched and connected with the inner surface of the flue side wall, the blocking surface is located on the windward side of the plane grille frame, and the blocking surface is stacked and fixedly connected with the plane grille frame.

[0011] A plurality of pressure strips are also arranged in the side wall of the flue, the pressure strips are connected and fixed to the plane grid frame, and the blocking surface is fixed between the pressure strips and the plane grid frame.

[0012] A plurality of pressure strips are arranged in regular rows and columns, and the pressure strips are bound and connected to the plane grid frame by metal wires, and the metal wires pass through the blocking surface.

[0013] Layering grids are formed between multiple layering strips, and the area of ​​a layering grid is less than 3m 2 , in the vertical direction, the distance between two adjacent layering strips is less than 1000mm.

[0014] The blocking surface is a flexible sealing cloth, the edge of the pressure strip is matched and connected with the inner surface of the flue side wall, and an asbestos rope is arranged between the edge of the blocking surface and the inner surface of the flue side wall.

[0015] A method for blocking a large-section flue, the large-section flue comprising a flue side wall, a plane grid frame arranged inside the flue side wall, the plane grid frame being connected and fixed to the flue side wall, the plane where the plane grid frame is located being arranged vertically or obliquely relative to the extension direction of the flue side wall;

[0016] The smoke duct blocking method comprises the following steps:

[0017] Step 1: Install the blocking surface on the windward side of the flat grid frame;

[0018] Step 2: Install a pressure strip on the windward side of the plane grille frame, connect and fix the pressure strip to the plane grille frame, and fix the blocking surface between the pressure strip and the plane grille frame.

[0019] The beneficial effects of the present invention are:

[0020] 1. The flue is tightly sealed, which has a good smoke blocking effect and can achieve almost no smoke leakage after blocking.

[0021] 2. It is quick and simple to implement, with low cost and no requirement for separate land occupation.

[0022] 3. No impact on the original system and no equipment maintenance is required.

[0023] 4. High safety and reliability, no special requirements for labor protection facilities and safety facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 It is a cross-sectional schematic diagram of the large-section flue that is easy to block according to the present invention.

[0026] Figure 2 yes Figure 1 Schematic diagram of direction A.

[0027] 1. Flue side wall; 2. Flat grille frame; 3. Support rod; 4. Blocking surface; 5. Pressure strip; 6. Metal wire;

[0028] 21. Grid through hole;

[0029] 51. Layering grid holes. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] A large cross-section flue that is easy to block comprises a flue side wall 1, a plane grid frame 2 is arranged inside the flue side wall 1, the edge of the plane grid frame 2 is connected and fixed to the flue side wall 1, and the plane where the plane grid frame 2 is located is vertically arranged or inclined relative to the extension direction of the flue side wall 1, such as Figure 1 and Figure 2 shown.

[0032] Among them, the meaning of the large-section flue is that when the cross-section of the flue is rectangular, the single-side dimension (side length) of the rectangular flue cross-section exceeds 7 meters; or when the cross-section of the flue is circular, the diameter of the circular flue exceeds 5 meters; or the cross-sectional area of ​​the flue exceeds 20 square meters.

[0033] The plane grid frame 2 is a plane grid structure, for example, the plane grid frame 2 is a stainless steel grid frame with an aperture of 200mmX300mm, and the extension direction of the flue side wall 1 is perpendicular to Figure 1 In the paper direction, the extension direction of the flue side wall 1 can also be called the axial direction or center line direction of the flue side wall 1.

[0034] Preferably, the plane where the planar grid frame 2 is located is arranged perpendicularly relative to the extension direction of the flue side wall 1, the edge of the planar grid frame 2 matches the inner surface of the flue side wall 1, and the edge of the leeward side of the planar grid frame 2 is welded to the reinforcement rib portion of the inner surface of the flue side wall 1.

[0035] Since the plane grid frame 2 is usually not removed, that is, the plane grid frame 2 is always installed in the flue side wall 1, the plane grid frame 2 should be able to ensure the normal ventilation and smoke exhaust function of the flue. The plane grid frame 2 contains a plurality of grid holes 21, and the grid holes 21 are rectangular. On the cross section of the large cross-section flue that is easy to block, the total area of ​​the grid holes 21 is preferably 70%-90% of the flow area of ​​the flue side wall 1, that is, Figure 1 The total area of ​​the middle grid through holes 21 is 70%-90% of the area of ​​the rectangle enclosed by the flue side wall 1 , and the flue gas can flow freely without being blocked in 70%-90% of the cross-sectional area of ​​the flue side wall 1 .

[0036] In order to reinforce the plane grid frame 2, a support rod 3 is further provided in the flue side wall 1. The support rod 3 can be a hollow steel pipe. The support rod 3 is located on the leeward side of the plane grid frame 2. The support rod 3 is welded and fixed to the flue side wall 1 and the plane grid frame 2. Figure 2 The support rod 3 can be in a horizontal state, a vertical state, or a horizontal state and a vertical state at the same time.

[0037] In this embodiment, a blocking surface 4 is further provided in the flue side wall 1, the edge of the blocking surface 4 is matched and connected with the inner surface of the flue side wall 1, the blocking surface 4 is located on the windward side of the plane grid frame 2, and the blocking surface 4 is stacked and fixedly connected with the plane grid frame 2. The function of the blocking surface 4 is to block the inner section of the large-section flue so that the smoke cannot flow in the large-section flue.

[0038] In this embodiment, the blocking surface 4 can be made of cloth with a certain bearing capacity and softness, sealing, and flame retardancy, for example, soft fiber fabric cloth or thicker plastic cloth, such as rainproof cloth. The number of layers of the cloth in the blocking surface 4 can be selected as one or more layers as needed.

[0039] In this embodiment, a plurality of pressure strips 5 are further provided in the flue side wall 1. The pressure strips 5 can be made of angle steel or metal strips. The pressure strips 5 not only connect and fix the blocking surface 4 to the plane grid frame 2, but also make the blocking surface 4 flat. The pressure strips 5 are connected and fixed to the plane grid frame 2, and the blocking surface 4 is fixed between the pressure strips 5 and the plane grid frame 2.

[0040] In this embodiment, a plurality of pressure strips 5 are arranged in regular rows and columns, and the pressure strips 5 are connected and fixed to the plane grid frame 2 by means of metal wires 6, and the metal wires 6 pass through the blocking surface 4. For example, a fixed iron wire (metal wire 6) is arranged on the plane grid frame 2 to fix the pressure strips 5, and the pressure strips 5 are made of angle steel of L30X3mm. The pressure strips 5 are as long as possible, but should be based on the convenience of transportation.

[0041] In this embodiment, a plurality of layering strips 5 form layering strip grid holes 51, which are rectangular in structure, and the area of ​​one layering strip grid hole 51 is less than 3m 2 In the vertical direction, the distance between two adjacent layering strips 5 is less than 1000 mm, and in the horizontal direction, the distance between two adjacent layering strips 5 is less than 3000 mm.

[0042] To ensure the sealing performance, when the cross-section of the flue side wall 1 is rectangular or circular, it should be ensured that the edge of the pressure strip 5 is matched and connected with the inner surface of the flue side wall 1, the edge of the blocking surface 4 is matched and connected with the inner surface of the flue side wall 1, the edge of the plane grid frame 2 is matched and connected with the inner surface of the flue side wall 1, and the gap between the edge of the blocking surface 4 and the inner surface of the flue side wall 1 can be filled with asbestos rope for sealing.

[0043] Two manholes are arranged on the flue side wall 1, and the two manholes are respectively located on both sides of the plane grid frame 2, that is, the plane grid frame 2 is located between the two manholes, and the two manholes are respectively located Figure 1 Manholes are set on the inside and outside of the paper surface to facilitate the entry and exit of personnel and materials.

[0044] During normal production, only the plane grid frame 2 and the support rod 3 are fixed in the large-section flue. When the large-section flue needs to be blocked, the system is temporarily shut down, and workers enter the plane grid frame 2 in the large-section flue to install the blocking surface 4 and the pressure strip 5 to completely block the flue. After the installation is completed, the system resumes production, and workers can enter the rear of the flue to carry out maintenance work. When the large-section flue needs to resume ventilation and smoke exhaust, only the blocking surface 4 and the pressure strip 5 can be removed, and the plane grid frame 2 and the support rod 3 can be retained.

[0045] It can be understood that when blocking is not required, the large-section flue for easy blocking of the present invention only contains the flue side wall 1, the plane grid frame 2 and the support rod 3, but does not contain the blocking surface 4 and the pressure strip 5. When blocking is required, the large-section flue for easy blocking of the present invention contains the flue side wall 1, the plane grid frame 2, the support rod 3, the blocking surface 4 and the pressure strip 5. The blocking surface 4 and the pressure strip 5 are both detachably connected to the plane grid frame 2.

[0046] A method for blocking a large-section flue is described below. The large-section flue includes a flue side wall 1. A plane grid frame 2 is provided inside the flue side wall 1. The plane grid frame 2 is connected and fixed to the flue side wall 1. The plane where the plane grid frame 2 is located is vertically or obliquely arranged relative to the extension direction of the flue side wall 1.

[0047] The smoke duct blocking method comprises the following steps:

[0048] The process system is shut down and harmful flue gases are removed.

[0049] Step 1, installing the blocking surface 4 on the windward side of the plane grid frame 2;

[0050] Personnel enter the flue side wall 1 from the manholes on both sides. Personnel on the windward side of the plane grille frame 2 bring the pressure strip 5 and the blocking surface 4 into the flue side wall 1 at the same time, and personnel on the leeward side of the plane grille frame 2 pour the fixed iron wire (metal wire 6) into the flue side wall 1; personnel on both sides use mobile ladders to spread the blocking surface 4 from top to bottom, evenly covering the entire plane grille frame 2, that is, the blocking surface 4 is stacked and connected with the plane grille frame 2.

[0051] Step 2: Install the pressure strip 5 on the windward side of the plane grid frame 2 . The pressure strip 5 is connected and fixed to the plane grid frame 2 . The blocking surface 4 is fixed between the pressure strip 5 and the plane grid frame 2 .

[0052] Use the fixing wire (metal wire 6) and the pressure strip 5 to fix the blocking surface 4 on the plane grid frame 2. The pressure strip 5 that is close to the flue side wall 1 should be close to the flue inner wall to play a role of fixing and sealing; if the flue inner wall has a curvature, the pressure strip 5 that is close to the flue inner wall should be made according to the curvature of the flue inner wall. The horizontal spacing of the pressure strip 5 should be connected end to end without leaving a gap in the middle. The vertical spacing of the pressure strip 5 should be less than 1000mm, and the pressing area of ​​the pressure strip 5 should not exceed 3m 2 , to prevent the spacing from being too large, causing the blocking surface to be damaged by excessive smoke pressure; the spacing of the fixed wire bundling is less than 600mm, the fixed wire penetrates the blocking surface 4, and the flat grid frame 2 and the pressure strip 5 are tied and fixed; after the fixation is completed, check the pressure strip 5 that is tightly attached to the inner wall of the flue, and use asbestos rope to plug and seal the obvious gaps to ensure complete sealing.

[0053] The personnel were evacuated and the manhole was closed to complete the blocking of the large-section flue. The process system was started for normal production, and the manhole on the leeward side was opened for normal maintenance operations.

[0054] After the inspection is completed, the personnel are evacuated. When it is necessary to remove the blockage of the large-section flue, the process system is shut down again, and the personnel enter the flue to remove all the blocking surfaces 4, pressure strips 5 and fixed iron wires (metal wires 6). The flat grid frame 2 (and the support rods 3) do not need to be removed; then the materials and personnel are evacuated and production is resumed.

[0055] The blocking process and subsequent maintenance implementation process do not require special labor protection supplies and instruments, and can be implemented according to the normal construction process in the flue. Taking the flue cross-sectional area of ​​70㎡ as an example, when the process system is shut down, 8 people can enter and complete the blocking and evacuate in no more than 2 hours. The blocking speed is fast, the blocking process is safe, the blocking effect is good, and the cost is low.

[0056] The specific application of the large-section flue that is easy to block and the blocking method of the large-section flue are introduced in detail below.

[0057] The system consists of two 230 square meter sintering machines, which share one wet desulfurization system and two denitrification systems. That is, the flue gas from the two sintering machines enters the desulfurization system uniformly. After desulfurization, the flue gas is divided into two paths and enters the 1# and 2# denitrification systems respectively, and then the flue gas is discharged through the same chimney.

[0058] The 1# and 2# denitrification systems are operating alone, while the other unit is under maintenance. Because the flue gas before the denitrification system shares a desulfurization system, and the flue gas after the denitrification system shares a chimney discharge outlet, when one unit is under maintenance, the flue gas of this unit needs to be completely blocked to facilitate personnel to enter the system for maintenance work.

[0059] The size of the flue side wall 1 of a single denitrification system is 11m×7m (height). The implementation is as follows:

[0060] The plane grille frame 2 is a stainless steel grille with a hole diameter of 200X300 (mm). During a certain system maintenance process, it is fixed in the flue, welded to the inner wall of the flue on all sides, and welded to the reinforcing ribs in the flue on the leeward side. After installation, the plane grille frame 2 is not removed. (That is, the flue at this time is transformed into the large-section flue that needs to be blocked as described in the present invention, and is also the large-section flue that is easy to block as described above)

[0061] Step 1, installing the blocking surface 4 on the windward side of the plane grid frame 2;

[0062] Step 2: Install the pressure strip 5 on the windward side of the plane grid frame 2 . The pressure strip 5 and the plane grid frame 2 are connected and fixed by metal wires 6 (such as iron wires). The blocking surface 4 is fixed between the pressure strip 5 and the plane grid frame 2 .

[0063] The materials used are as follows:

[0064] The fixed iron wire diameter ф6 about 15kg is arranged on the plane grid frame 2;

[0065] The layering strip 5 is made of L30X3 angle steel. There are 58 6m long layering strips, 58 5m long layering strips, 530 1m long layering strips, and 55 0.76m long layering strips.

[0066] After wet desulfurization, the flue gas temperature is low and the humidity is high. The blocking surface 4 uses 0.3mm thick PVC rainproof cloth, 12m×8m, one roll.

[0067] 6mm asbestos rope weighs about 20kg.

[0068] 2 mobile lifting ladders. 4 sets of other tools (such as wrenches, pliers, etc.).

[0069] There are 8 construction workers, equipped with labor protection supplies and safety measures (safety ropes, etc.).

[0070] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with technical features and technical solutions, and with technical solutions.

Claims

1. A large cross-section flue that is easy to block, characterized in that: The large-section flue that is easy to block comprises a flue side wall (1), a plane grille frame (2) is arranged inside the flue side wall (1), the plane grille frame (2) is connected and fixed to the flue side wall (1), and the plane where the plane grille frame (2) is located is arranged vertically or inclined relative to the extension direction of the flue side wall (1); The cross-sectional area of ​​the large cross-sectional flue exceeds 20 square meters; A support rod (3) is also provided in the flue side wall (1), the support rod (3) is located on the leeward side of the plane grid frame (2), and the support rod (3) is connected and fixed to the flue side wall (1) and the plane grid frame (2); A blocking surface (4) is also provided inside the flue side wall (1), the edge of the blocking surface (4) is matched and connected to the inner surface of the flue side wall (1), the blocking surface (4) is located on the windward side of the plane grille frame (2), and the blocking surface (4) is stacked, connected and fixed to the plane grille frame (2); A plurality of pressure strips (5) are also provided in the flue side wall (1); the pressure strips (5) are connected and fixed to the plane grid frame (2); and the blocking surface (4) is fixed between the pressure strips (5) and the plane grid frame (2).

2. The large cross-section flue that is easy to block according to claim 1 is characterized in that: The plane where the plane grid frame (2) is located is arranged perpendicularly to the extension direction of the flue side wall (1), and the edge of the plane grid frame (2) is welded to the inner surface of the flue side wall (1).

3. The large cross-section flue that is easy to block according to claim 1 is characterized in that: The plane grid frame (2) contains a plurality of grid through holes (21). On the cross section of the large cross-section flue that is easy to block, the total area of ​​the grid through holes (21) is 70% to 90% of the flow area of ​​the flue side wall (1).

4. The large cross-section flue that is easy to block according to claim 1 is characterized in that: The plurality of pressure strips (5) are arranged in regular rows and columns, and the pressure strips (5) are bound, connected and fixed to the plane grid frame (2) via metal wires (6), and the metal wires (6) pass through the blocking surface (4).

5. The large cross-section flue that is easy to block according to claim 1 is characterized in that: A plurality of layering strips (5) form layering strip grid holes (51), and the area of ​​one layering strip grid hole (51) is less than 3m 2 In the vertical direction, the distance between two adjacent layering strips (5) is less than 1000 mm.

6. The large cross-section flue that is easy to block according to claim 1, characterized in that: The blocking surface (4) is a flexible sealing cloth, the edge of the pressure strip (5) is matched and connected to the inner surface of the flue side wall (1), and an asbestos rope is provided between the edge of the blocking surface (4) and the inner surface of the flue side wall (1).

7. A method for blocking a large cross-section flue that is easy to block as claimed in claim 1, characterized in that: The smoke duct blocking method comprises the following steps: Step 1: Install a blocking surface (4) on the windward side of the plane grid frame (2); Step 2: Install a pressure strip (5) on the windward side of the plane grid frame (2), the pressure strip (5) is connected and fixed to the plane grid frame (2), and the blocking surface (4) is fixed between the pressure strip (5) and the plane grid frame (2).

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