Turning plate type flue gas conversion valve with sealing structure

Abstract

The invention relates to a flap type flue gas conversion valve with a sealing structure. The flap type flue gas conversion valve comprises a conversion valve butt joint pipe and a flap valve, a bottom opening of the change-over valve butt-joint pipe is communicated with the dust collection main pipe, and a flap valve is arranged at a top opening of the change-over valve butt-joint pipe; the flap valve consists of a valve plate, a rotating shaft and a valve arm; the rotating shaft is arranged in the middle of the valve plate; the two ends of the rotating shaft penetrate out of the corresponding side walls of the change-over valve butt-joint pipe and then are connected with valve arms on the corresponding sides. An external push rod acts on the valve arm and drives the whole valve plate to rotate around the axis of the rotating shaft through the rotating shaft; a sealing structure is arranged between the valve plate and the change-over valve butt-joint pipe. According to the flue gas conversion valve, the problems of water accumulation, valve plate blocking, dust accumulation and the like when the flue gas conversion valve is installed in an upper opening mode after the flue gas conversion valve is arranged on the ground are solved, and effective sealing can be achieved; the overall structure is simple, and work is stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of coke oven flue gas dust removal technology, and in particular to a flap-type flue gas switching valve with a sealing structure. Background Technology

[0002] During the coking process in a coke oven, when the red-hot coke is pushed out of the carbonization chamber by the coke pusher and falls into the quenching car through the coke guide grid, a large amount of high-temperature, high-concentration dust-laden flue gas is generated. This flue gas mainly contains coke powder, soot, and harmful substances. If it is emitted directly without treatment, it will cause serious environmental pollution. The coking dust removal system is a complete set of equipment specifically designed to collect, transport, and purify the soot generated during the coking process in a coke oven. It is an indispensable environmental protection facility for modern coke ovens.

[0003] In coke oven dust removal systems using a fixed roof hood (or canopy hood), a single ground-based dust collection station typically handles dust removal from multiple carbonization chambers. The core function of the flue gas switching valve is to precisely "switch" the ventilation capacity of the ground-based dust collection station to the carbonization chamber currently undergoing coke removal, based on the coke removal schedule, while closing the passages to other carbonization chambers. Existing coke oven dust removal systems generally employ a flap-type flue gas switching valve, with a dust suction hood mounted on the coke quenching car. The flue gas switching valve guides the collected dust during coke removal into the dust collection main pipe, where it is then drawn in by the dust removal fan and purified at the ground-based dust collection station.

[0004] Currently, the quenching method for coke ovens has gradually evolved from the early stage of all wet quenching to dry quenching as the main method and wet quenching as a backup. Regardless of the method used, a coke drying platform must be set up on the coke side of the coke oven. In order not to affect the coke drying operation on the drying platform, the dust collection main pipe of the coke discharge dust removal system usually needs to be installed on a steel structure support or reinforced concrete support with a height of 12 to 18m.

[0005] With the continuous development of coke oven coking technology, more and more coking enterprises have eliminated wet quenching facilities and adopted a fully dry quenching process. However, the setting method of the dust collection main pipe in the coke discharge dust removal system has not changed accordingly. The problem with this setting method is that, because the dust removal interface of the coke quenching car is relatively high, the flue gas conversion valve and the dust collection main pipe need to be set at the same height through steel structure supports or reinforced concrete supports, resulting in high construction costs, difficult maintenance, and poor structural stability.

[0006] Floor-mounted flue gas switching valves effectively solve the above problems. However, floor-mounted flue gas switching valves, if using the existing horizontal side-opening installation, suffer from problems such as large footprint and high piping consumption. While using angled or vertical top-opening installations presents the following issues: 1. Internal water cannot be drained. When the valve is open, water will enter the flue gas switching valve and dust collection station with the flue gas, causing problems such as dust collector bag clogging and poor ash conveying. 2. After the valve plate opens, it may jam because its center of gravity exceeds the center of the rotation axis, preventing it from closing under its own weight. 3. When the valve plate is open, a dead angle is formed between the valve plate and the valve seat. Flue gas entering this dead angle easily accumulates ash, causing environmental pollution. Summary of the Invention

[0007] This invention provides a flap-type flue gas switching valve with a sealing structure, which solves the problems of water accumulation, valve plate jamming, and dust accumulation that exist when the flue gas switching valve is installed on the ground with an open top. It can also achieve effective sealing. The overall structure is simple and the operation is stable and reliable.

[0008] To achieve the above objectives, the present invention employs the following technical solution: A flap-type flue gas switching valve with a sealing structure includes a switching valve connecting pipe and a flap valve. The bottom opening of the switching valve connecting pipe is connected to a dust collection main pipe, and a flap valve is provided at the top opening of the switching valve connecting pipe. The flap valve consists of a valve plate, a rotating shaft, and a valve arm, with the rotating shaft located in the middle of the valve plate. The top surface of the switching valve connecting pipe is inclined, and the valve plate located between the rotating shaft and the high end of the top surface of the switching valve connecting pipe is the lower flap valve plate, while the valve plate located on the other side of the rotating shaft is the upper flap valve plate. The two ends of the rotating shaft pass through the corresponding side walls of the switching valve connecting pipe and connect to the valve arms on the corresponding sides. An external push rod acts on the valve arm and drives the valve plate to rotate around the axis of the rotating shaft. A sealing structure is provided between the valve plate and the switching valve connecting pipe.

[0009] The horizontal cross-section of the connecting pipe of the switching valve is rectangular.

[0010] The axis of the rotating shaft is eccentrically positioned relative to the center line of the valve plate, and the rotating shaft is positioned near the high end of the top surface of the switching valve connecting pipe.

[0011] The axis of the rotating shaft is concentric with the center line of the valve plate, and the valve plate on the upper side is equipped with a counterweight.

[0012] The outer side of the switching valve connecting pipe is provided with a bearing seat at the corresponding shaft protrusion, and the shaft and the corresponding bearing seat are rotatably connected by a bearing; the outer end of the bearing seat is provided with a shaft end sealing structure.

[0013] The sealing structure between the valve plate and the switching valve connecting pipe includes a sealing steel plate and an annular sealing gasket; the top of the switching valve connecting pipe is provided with a sealing steel plate, and the bottom of the valve plate is provided with an annular sealing gasket; when the valve plate is closed, the annular sealing gasket cooperates with the sealing steel plate to achieve a seal.

[0014] A flap-type flue gas switching valve with a sealing structure also includes an automatic drainage mechanism; the automatic drainage mechanism consists of a U-shaped water seal pipe, a drain pipe and a water supply pipe, one end of the U-shaped water seal pipe is provided with a horizontal pipe section connected to a sealing steel plate located at the lower end of the top surface of the switching valve connecting pipe, and the other end of the U-shaped water seal pipe is connected to the drain pipe; the water supply pipe is located at the top of the horizontal pipe section.

[0015] The drainage pipe is lower than the horizontal section of the U-shaped water seal pipe, and the height difference between the bottom surfaces of the two is not less than 100mm.

[0016] A flap-type flue gas switching valve with a sealing structure also includes an automatic drainage mechanism; the automatic drainage mechanism consists of a water outlet pipe, a check valve and an automatic drainage valve, one end of the water outlet pipe is connected to a sealing steel plate located at the lower end of the top surface of the switching valve connecting pipe, and the check valve and the automatic drainage valve are arranged sequentially from the inside to the outside of the water outlet pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1) The flue gas switching valve adopts a structure with a rotating shaft in the middle of the valve plate. After the valve plate is opened, there is no dead angle between it and the switching valve connecting pipe, and there is no problem of dust accumulation. Furthermore, the switching valve connecting pipe and the connected flue gas conveying pipe can use pipes of the same diameter, avoiding eddies and energy loss caused by changes in pipe cross-sectional area.

[0018] 2) The flue gas switching valve adopts a structure with a rotating shaft in the middle of the valve plate. The rotating shaft has a shaft end sealing structure at the end of the switching valve connecting pipe. The top surface of the switching valve connecting pipe is equipped with sealing steel plates around the perimeter, which cooperate with the annular sealing gasket on the valve plate to achieve effective sealing of the flue gas switching valve and prevent problems such as air volume loss, increased energy consumption and reduced dust removal effect caused by poor sealing.

[0019] 3) An automatic drainage mechanism is installed, which can promptly drain the water accumulated at the flue gas conversion valve and prevent air leakage or backflow when there is no drainage or the drainage volume is small.

[0020] 4) By setting the eccentricity of the rotating shaft or adding counterweight to the upward-flipping side valve plate, the problem of the valve plate not being able to fall and close under its own weight after opening can be effectively avoided. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the flap-type flue gas switching valve with a sealing structure described in this invention.

[0022] Figure 2 yes Figure 1Top view.

[0023] Figure 3 This is a schematic diagram of the sealing structure between the valve plate and the switching valve connecting pipe of the present invention.

[0024] Figure 4 This is a schematic diagram of the automatic drainage mechanism described in this invention. Figure 1 (U-shaped water seal).

[0025] Figure 5 This is a schematic diagram of the automatic drainage mechanism described in this invention. Figure 2 (Automatic drain valve).

[0026] In the diagram: 1. Converter valve connecting pipe; 11. Sealing steel plate; 2. Dust collection main pipe; 3. Flip valve; 31. Rotating shaft; 32. Valve plate; 32a. Upper flip valve plate; 32b. Lower flip valve plate; 33. Valve arm; 34. Annular sealing gasket; 4. Automatic drainage mechanism; 411. U-shaped water seal pipe; 412. Drain pipe; 413. Water supply pipe; 421. Water outlet pipe; 422. Check valve; 423. Automatic drain valve; 5. Push rod. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: like Figure 1 , Figure 2 As shown, the present invention discloses a flap-type flue gas switching valve with a sealing structure, comprising a switching valve connecting pipe 1 and a flap valve 3; the bottom opening of the switching valve connecting pipe 1 is connected to the dust collection main pipe 2, and the flap valve 3 is provided at the top opening of the switching valve connecting pipe 1; the flap valve 3 is composed of a valve plate 32, a rotating shaft 31, and a valve arm 33, with the rotating shaft 31 located in the middle of the valve plate 32; the top surface of the switching valve connecting pipe 1 is an inclined surface, the valve plate 32 located between the rotating shaft 31 and the high end of the top surface of the switching valve connecting pipe 1 is a downward-flipping valve plate 32b, and the valve plate 32 located on the other side of the rotating shaft 31 is an upward-flipping valve plate 32a; the two ends of the rotating shaft 31 pass through the corresponding side walls of the switching valve connecting pipe 1 and connect to the corresponding valve arm 33; the external push rod 5 acts on the valve arm 33 and drives the valve plate 32 to rotate around the axis of the rotating shaft 31 through the rotating shaft 31; a sealing structure is provided between the valve plate 32 and the switching valve connecting pipe 1.

[0028] The horizontal cross-section of the switching valve connecting pipe 1 is rectangular.

[0029] The axis of the rotating shaft 31 is eccentrically positioned relative to the center line of the valve plate 32, and the rotating shaft 31 is positioned on the high end side of the top surface of the switching valve connecting pipe 1.

[0030] The axis of the rotating shaft 31 is concentric with the center line of the valve plate 32, and the valve plate 32a on the upper side is provided with a counterweight.

[0031] The outer side of the switching valve connecting pipe 1 is provided with a bearing seat at the corresponding shaft 31 protruding point, and the shaft 31 and the corresponding bearing seat are rotatably connected by a bearing; the outer end of the bearing seat is provided with a shaft end sealing structure.

[0032] like Figure 3 As shown, the sealing structure between the valve plate 32 and the switching valve connecting pipe 1 includes a sealing steel plate 11 and an annular sealing gasket 34; the top periphery of the switching valve connecting pipe 1 is provided with a sealing steel plate 11, and the bottom of the valve plate 32 is provided with an annular sealing gasket 34; when the valve plate 32 is closed, the annular sealing gasket 34 cooperates with the sealing steel plate 11 to achieve a seal.

[0033] like Figure 4 As shown, the flap-type flue gas switching valve with a sealing structure of the present invention also includes an automatic drainage mechanism; the automatic drainage mechanism consists of a U-shaped water seal pipe 411, a drain pipe 412 and a water supply pipe 413. One end of the U-shaped water seal pipe 411 is provided with a horizontal pipe section connected to a sealing steel plate 11 located at the lower end of the top surface of the switching valve connecting pipe 1, and the other end of the U-shaped water seal pipe 411 is connected to the drain pipe 412; the water supply pipe 413 is located at the top of the horizontal pipe section.

[0034] The drain pipe 412 is lower than the horizontal section of the U-shaped water seal pipe 411, and the height difference between the bottom surfaces of the two is not less than 100mm.

[0035] like Figure 5 As shown, the flap-type flue gas switching valve with a sealing structure of the present invention also includes an automatic drainage mechanism; the automatic drainage mechanism consists of a water outlet pipe 421, a check valve 422 and an automatic drainage valve 423. One end of the water outlet pipe 421 is connected to a sealing steel plate 11 located at the lower end of the top surface of the switching valve connecting pipe 1. The check valve 422 and the automatic drainage valve 423 are arranged sequentially from the inside to the outside in the water outlet pipe 421.

[0036] The present invention discloses a flap-type flue gas switching valve with a sealing structure, comprising a switching valve connecting pipe 1 (connected to the dust collection main pipe 2), a flap valve 3, and a sealing structure. The switching valve connecting pipe 1 is positioned above and connected to the dust collection main pipe 2. The flap valve 3 is positioned at the top of the switching valve connecting pipe 1 and consists of a rotating shaft 31, a valve plate 32, and a valve arm 33.

[0037] An annular sealing gasket 34 is provided circumferentially at the bottom of the valve plate 32 of the flap valve 3, which cooperates with the sealing steel plate 11 provided circumferentially at the top of the switching valve connecting pipe 1 to form an effective seal when the flap valve 3 is closed.

[0038] The two ends of the rotating shaft 31 pass through the pipe wall on the corresponding side of the switching valve connecting pipe 1, and the rotating shaft 31 is connected to the valve plate 32 inside the switching valve connecting pipe 1. The valve plate 32 can rotate with the rotating shaft 31.

[0039] In order for the flap valve 3 to close the valve plate 32 by its own weight, one of the following two methods can be selected: one is to arrange the rotating shaft 31 eccentrically (the center line of the rotating shaft 31 is eccentric relative to the center line of the switching valve connecting pipe 1, and is biased towards the high end of the top surface of the switching valve connecting pipe 1); the other is to set the rotating shaft 31 in the center, but set a counterweight at the bottom of the upper flap valve plate 32a, so that its weight is greater than that of the lower flap valve plate 32b.

[0040] The two ends of the rotating shaft 31 are fixedly connected to the valve arm 33. The valve arm 33 can rotate around the rotating shaft 31 under the pushing action of the push rod 5 and drive the valve plate 32 to rotate and open. When the push rod 5 is withdrawn, the valve plate 32 returns to the closed state by eccentricity or its own weight.

[0041] When the flue gas switching valve and the telescopic guide sleeve of the flue gas quenching car's flue gas pipe are connected at an angle, uneven stress distribution can easily lead to poor sealing and high air leakage. Furthermore, the angled connection can easily cause shearing damage between the telescopic guide sleeve of the flue gas quenching car's flue gas pipe and the connecting pipe 1 of the flue gas switching valve. To avoid these issues, a flat connection can be used between the flue gas switching valve and the telescopic guide sleeve of the flue gas quenching car's flue gas pipe. The only disadvantage of a flat connection is the inability to drain water promptly. Therefore, this invention provides an automatic drainage mechanism at the lowest point of the top surface of the connecting pipe 1 of the switching valve. The automatic drainage mechanism can be a U-shaped water seal type or an automatic drainage valve type.

[0042] The U-shaped water seal automatic drainage mechanism consists of a U-shaped water seal pipe 411, a drain pipe 412, and a water supply pipe 413. The water supply pipe 413 is used to replenish water into the U-shaped water seal pipe 411 to ensure the water seal height within the U-shaped water seal pipe 411 and prevent the water seal from being damaged when the flap-type switching valve is opened due to an insufficient water seal height.

[0043] The automatic drainage mechanism consists of an outlet pipe 421, a check valve 422, and an automatic drainage valve 423. The automatic drainage valve 423 automatically opens when there is accumulated water, draining the water inside the switching valve connector 1. When there is no accumulated water, the automatic drainage valve 423 closes. The check valve 422 prevents backflow of accumulated water during drainage.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flap-type flue gas switching valve with a sealing structure, characterized in that, The system includes a switching valve connecting pipe and a flap valve; the bottom opening of the switching valve connecting pipe is connected to the dust collection main pipe, and a flap valve is installed at the top opening of the switching valve connecting pipe; the flap valve consists of a valve plate, a rotating shaft, and a valve arm, with the rotating shaft located in the middle of the valve plate; the top surface of the switching valve connecting pipe is an inclined surface, and the valve plate located between the rotating shaft and the high end of the top surface of the switching valve connecting pipe is the downward flap valve plate, while the valve plate located on the other side of the rotating shaft is the upward flap valve plate; both ends of the rotating shaft pass through the corresponding side walls of the switching valve connecting pipe and connect to the corresponding valve arms; an external push rod acts on the valve arm and drives the valve plate to rotate around the axis of the rotating shaft; a sealing structure is provided between the valve plate and the switching valve connecting pipe.

2. The flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, The horizontal cross-section of the connecting pipe of the switching valve is rectangular.

3. The flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, The axis of the rotating shaft is eccentrically positioned relative to the center line of the valve plate, and the rotating shaft is positioned near the high end of the top surface of the switching valve connecting pipe.

4. A flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, The axis of the rotating shaft is concentric with the center line of the valve plate, and the valve plate on the upper side is equipped with a counterweight.

5. A flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, The outer side of the switching valve connecting pipe is provided with a bearing seat at the corresponding shaft protrusion, and the shaft and the corresponding bearing seat are rotatably connected by a bearing; the outer end of the bearing seat is provided with a shaft end sealing structure.

6. A flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, The sealing structure between the valve plate and the switching valve connecting pipe includes a sealing steel plate and an annular sealing gasket; the top of the switching valve connecting pipe is provided with a sealing steel plate, and the bottom of the valve plate is provided with an annular sealing gasket; when the valve plate is closed, the annular sealing gasket cooperates with the sealing steel plate to achieve a seal.

7. A flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, It also includes an automatic drainage mechanism; the automatic drainage mechanism consists of a U-shaped water seal pipe, a drain pipe and a water supply pipe. One end of the U-shaped water seal pipe is provided with a horizontal pipe section connected to a sealing steel plate located at the lower end of the top surface of the switching valve connecting pipe, and the other end of the U-shaped water seal pipe is connected to the drain pipe; the water supply pipe is located at the top of the horizontal pipe section.

8. A flap-type flue gas switching valve with a sealing structure according to claim 7, characterized in that, The drainage pipe is lower than the horizontal section of the U-shaped water seal pipe, and the height difference between the bottom surfaces of the two is not less than 100mm.

9. A flap-type flue gas switching valve with a sealing structure according to claim 1, characterized in that, It also includes an automatic drainage mechanism; the automatic drainage mechanism consists of a water outlet pipe, a check valve and an automatic drain valve. One end of the water outlet pipe is connected to a sealing steel plate located at the lower end of the top surface of the switching valve connecting pipe. The check valve and the automatic drain valve are arranged sequentially from the inside to the outside of the water outlet pipe.

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