Cover type flue gas conversion valve

Abstract

The invention relates to a cover type flue gas conversion valve which comprises a cover-shaped valve plate and a push rod mechanism, and the cover-shaped valve plate is composed of a valve plate, a sealing cover body and an annular sealing ring; the top surface of the sealing cover body is an inclined surface and the bottom surface is a plane; a bottom opening of the sealing cover body is communicated with the dust removal main pipe through a butt joint pipe; the valve plate is arranged at the top of the sealing cover body; the cover type flue gas conversion valve further comprises a heavy hammer mechanism. According to the invention, the problems existing when a flue gas conversion valve is mounted in an upper opening manner in a coke oven coke discharging and dust removing system with a floor-mounted flue gas conversion device are solved; a conventional flat-plate-shaped valve plate is changed into the cover-shaped valve plate, so that the contact surface between the valve plate and the connecting pipe is changed into a plane from an inclined plane, the problems of poor sealing effect and large air leakage rate which are easy to occur during inclined butt joint are avoided, and meanwhile, shear damage to a butt joint part is avoided; and a heavy hammer mechanism is additionally arranged to prevent the valve plate from being stuck.

Description

TECHNICAL FIELD

[0001] The present application relates to a flue gas conversion valve, in particular to a cover type flue gas conversion valve. BACKGROUND

[0002] Coke oven dedusting is a key link in coke oven coking process to control flue dust emission, aiming to reduce the episodic flue dust pollution generated when high-temperature coke is pushed out from the carbonization chamber during coking. The working process of the existing coke oven dedusting system is as follows: when the coke oven is coked, the flue dust in the coking process is captured by the dust collection hood configured on the coke blocking car, the captured flue dust is introduced into the dust collection main pipe through the flue gas conversion device (flue gas conversion valve, belt sealing trolley or water-sealed smoke guide pipe, etc.), and the flue dust is sent to the coke oven dedusting ground station for purification treatment through the dust collection main pipe.

[0003] Coke oven quenching has gradually developed from the earliest wet quenching to the mode of "mainly dry quenching and wet quenching as backup". Whether wet quenching is used or wet quenching is used as backup, a coke cooling platform needs to be set up on the coke side of the coke oven. In order not to affect the coke cooling operation of the coke cooling platform, the dust collection main pipe in the coke oven dedusting system is usually arranged on a steel structure or a reinforced concrete support with a height of 12-18 m. Although the coke oven system using the full dry quenching process has appeared, the setting form of the dust collection main pipe in the coke oven dedusting system has not been changed accordingly.

[0004] Since the height of the dust collection interface on the coke blocking car is usually high, the flue gas conversion device and the dust collection main pipe need to be realized through a steel structure or a reinforced concrete support if they are arranged at the same height. The disadvantages of this setting mode are: 1. high cost, the material and construction cost of the steel structure or the reinforced concrete support accounts for more than 30% of the total investment of the coke oven dedusting equipment; 2. difficult to maintain, high-altitude equipment maintenance needs to set up a scaffold, which has high operation risk and long cycle; 3. hidden danger in work stability; due to the influence of long-term thermal expansion, vibration and other factors, the steel structure or the reinforced concrete support is easy to deform, resulting in misalignment of the dust collection interface and air leakage.

[0005] The problem can be solved by setting the flue gas conversion device on the ground. In a coke oven coking dedusting system and process (a patent applied on the same day as the present invention), the flue gas conversion device is set on the ground. The coke oven coking dedusting system comprises a coke pushing car dust collecting hood, a flue gas guide pipe, a moving connection mechanism and a flue gas conversion device. The coke pushing car dust collecting hood is set on the coke pushing car. One end of the flue gas guide pipe is connected with the coke pushing car dust collecting hood. The other end of the flue gas guide pipe is connected with the flue gas conversion device through the moving connection mechanism. The moving connection mechanism and the flue gas conversion device are movably and sealingly connected. The flue gas conversion device can adopt a valve sealing type dedusting dry pipe which comprises a dedusting dry pipe and a flue gas conversion valve. The dedusting dry pipe is provided with openings corresponding to each carbonization chamber. The openings are provided with sealing conversion valves. The moving connection mechanism comprises a sleeve, a movable guide sleeve, an extension drive device and a valve opening and closing device. The sleeve is connected with the flue gas guide pipe. The extension drive device and the valve opening and closing device are arranged on the sleeve. One end of the movable guide sleeve is connected with the sleeve. The other end of the movable guide sleeve can be moved up and down under the drive of the extension drive device to realize the butt joint between the corresponding interfaces of the flue gas conversion valve. The valve opening and closing device is used to control the opening and closing of the flue gas conversion valve. The flue gas conversion valve is arranged at the opening of the dedusting dry pipe. The opening can adopt an upper opening, a side opening or an inclined opening. Compared with the inclined opening or the upper opening, the side opening has the problems of large floor area and high pipe consumption. When the inclined opening or the upper opening is adopted, the flue gas conversion device has the following problems: 1) the internal accumulated water cannot be discharged. When the flue gas conversion valve is opened, the internal accumulated water in the flue gas guide pipe enters the flue gas conversion device and the dedusting ground station with the flue gas, resulting in the problems of bag sticking of the dedusting bag, poor ash conveying and the like. 2) When the valve plate of the flue gas conversion valve is opened, the valve plate can be stuck due to the deviation of the gravity center of the valve plate from the center of the rotating shaft, and cannot be closed by gravity. 3) When the valve plate of the flue gas conversion valve is opened, there is a dead angle between the valve plate and the valve body. The accumulated ash in this area can cause environmental pollution.

[0006] A special super large conversion device for coke oven flue gas dedusting is disclosed in Chinese patent application No. 200510038998.5. The device comprises a fixed dry pipe and a valve group. The fixed dry pipe is provided with not less than four interfaces. The flange plane at the interface is inclined at an angle of 75 to 80 degrees with the horizontal plane. The device is equivalent to a side opening flip plate type flue gas conversion valve. The device has no internal accumulated water and accumulated ash problems. However, when the valve plate is opened, the valve plate can be stuck due to the deviation of the gravity center of the valve plate from the center of the rotating shaft, and cannot be closed by gravity. In addition, the butt joint between the flue gas conversion valve and the extension guide sleeve of the car flue gas guide pipe is inclined butt joint. The uneven distribution of contact stress can result in poor sealing effect, large air leakage and the like. The inclined butt joint can also cause the shearing damage of the extension guide sleeve of the car flue gas guide pipe and the butt joint pipe of the flue gas conversion valve. SUMMARY

[0007] The application provides a cover type flue gas conversion valve, solves the problems in the coke oven coke discharging and dust removal system of the floor-mounted flue gas conversion device when the flue gas conversion valve is installed in an upper opening mode, changes a conventional flat valve plate into a cover type valve plate, changes a contact surface between the valve plate and a connecting pipe from an inclined surface into a plane, avoids the problems of poor sealing effect and large air leakage that are prone to occur in the inclined butt joint, simultaneously avoids shear damage at the butt joint part, and avoids the valve plate from being stuck through the increase of a weight hammer mechanism.

[0008] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0009] The cover type flue gas conversion valve comprises a cover type valve plate and a push rod mechanism, the cover type valve plate is composed of a valve plate, a sealing cover body and an annular sealing ring, the top surface of the sealing cover body is an inclined surface, the bottom surface is a plane, the bottom opening of the sealing cover body is connected with a dust removal main pipe through a butt joint pipe, the annular sealing ring is arranged between the sealing cover body and the butt joint pipe, the valve plate is arranged at the top of the sealing cover body, and the push rod mechanism is used for driving the cover type valve plate to rotate, so that the flue gas inlet at the top of the butt joint pipe is opened or closed.

[0010] When the cover type valve plate closes the flue gas inlet at the top of the butt joint pipe, the included angle between the top surface of the sealing cover body and the horizontal plane is greater than 2°.

[0011] The push rod mechanism is composed of a push rod, a connecting rod and a hinged mechanism, the connecting rod is fixedly connected with the valve plate, the connecting rod is connected with the push rod and is rotatably connected with the butt joint pipe through the hinged mechanism, and one end of the top surface of the sealing cover body close to the hinged mechanism is lower than the other end.

[0012] The push rod mechanism is composed of a push rod, a connecting rod and a hinged mechanism, the connecting rod is fixedly connected with the valve plate, the connecting rod is connected with the push rod and is rotatably connected with the butt joint pipe through the hinged mechanism, and one end of the top surface of the sealing cover body close to the hinged mechanism is higher than the other end.

[0013] The hinged mechanism is composed of an ear seat and a rotating shaft, the ear seat is fixed on the outer wall of the butt joint pipe, the rotating shaft is supported by the ear seat, and the connecting rod and the push rod are connected with the rotating shaft respectively.

[0014] The connecting rod and the push rod are an integral structure.

[0015] The connecting rod and the valve plate are connected through a fixed seat.

[0016] The cover type flue gas conversion valve further comprises a weight hammer mechanism, the weight hammer mechanism is composed of a hammer head and a connecting rod, and the hammer head is connected with the rotating shaft through the connecting rod.

[0017] The weight hammer mechanism is 2 groups and is symmetrically installed at both ends of the rotating shaft.

[0018] Compared with the prior art, the application has the beneficial effects that:

[0019] 1)Solve the problem of the smoke conversion device in the coke oven coke discharge dust removal system, using the upper opening method to install the smoke conversion valve;

[0020] 2)The conventional flat valve plate is changed to a cover-shaped valve plate, the contact surface between the valve plate and the butt joint pipe is changed from an inclined surface to a flat surface, and the butt joint between the movable guide sleeve of the coke guide pipe and the butt joint pipe is also changed from an inclined surface to a flat surface, thereby avoiding the problem of poor sealing effect and large air leakage caused by uneven distribution of contact stress during inclined butt joint, and avoiding the problem of shear failure of the movable guide sleeve of the coke guide pipe and the butt joint pipe caused by inclined butt joint.

[0021] 3)The weight mechanism is increased, which can provide power for the valve plate to fall when the smoke conversion valve is closed, solving the problem of valve plate jamming and automatic closing caused by excessive opening of the conventional smoke conversion valve. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structure diagram of the cover-type smoke conversion valve according to embodiment 1 of the present application.

[0023] Figure 2 is a connection relationship diagram of the cover-type smoke conversion valve according to embodiment 1 of the present application and the butt joint pipe and the dust removal main pipe.

[0024] Figure 3 is a structure diagram of the cover-type smoke conversion valve according to embodiment 2 of the present application.

[0025] Figure 4 is a connection relationship diagram of the cover-type smoke conversion valve according to embodiment 2 of the present application and the butt joint pipe and the dust removal main pipe.

[0026] In the figure: 1. Butt joint pipe 2. Dust removal main pipe 3. Cover-shaped valve plate 31. Sealing cover body 32. Annular sealing ring 33. Valve plate 4. Push rod mechanism 41. Push rod 42. Connecting rod 43. Shaft 44. Ear seat 45. Fixed seat 5. Hydraulic push rod 6. Weight mechanism 61. Hammer head 62. Connecting rod DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be further described below in conjunction with the drawings:

[0028] As Figures 1-4As shown, the present invention discloses a hood-type flue gas switching valve, comprising a hood-shaped valve plate 3 and a push rod mechanism 4. The hood-shaped valve plate 3 consists of a valve plate 33, a sealing cover body 31, and an annular sealing ring 32. The top surface of the sealing cover body 31 is inclined, and the bottom surface is flat. The bottom opening of the sealing cover body 31 is connected to the dust removal main pipe 2 through the connecting pipe 1. The annular sealing ring 32 is disposed between the sealing cover body 31 and the connecting pipe 1. The valve plate 33 is disposed on the top of the sealing cover body 31. The push rod mechanism 4 is used to drive the hood-shaped valve plate 3 to rotate, thereby opening or closing the flue gas inlet at the top of the connecting pipe 2.

[0029] When the hood-shaped valve plate 3 closes the flue gas inlet at the top of the connecting pipe 1, the angle between the top surface of the sealing cover body 31 and the horizontal plane is greater than 2°.

[0030] like Figure 1 As shown, the push rod mechanism 4 consists of a push rod 41, a connecting rod 42, and a hinge mechanism; the connecting rod 42 is fixedly connected to the valve plate 33, and the connecting rod 42 is connected to the push rod 41 and rotatably connected to the connecting pipe 1 through the hinge mechanism; the top surface of the sealing cover body 31 is lower at one end near the hinge mechanism than at the other end.

[0031] like Figure 3 As shown, the push rod mechanism 4 consists of a push rod 41, a connecting rod 42, and a hinge mechanism; the connecting rod 42 is fixedly connected to the valve plate 33, and the connecting rod 42 is connected to the push rod 41 and rotatably connected to the connecting pipe 1 through the hinge mechanism; the top surface of the sealing cover body 31 is higher at one end near the hinge mechanism than at the other end.

[0032] The hinge mechanism consists of an ear seat 44 and a rotating shaft 43. The ear seat 44 is fixed on the outer wall of the connecting tube 1, and the rotating shaft 43 is supported by the ear seat 44. The connecting rod 42 and the push rod 41 are respectively connected to the rotating shaft 43.

[0033] The connecting rod 42 and the push rod 41 are an integral structure.

[0034] The connecting rod 42 is connected to the valve plate 33 via a fixed seat 45.

[0035] The hood-type flue gas switching valve of the present invention further includes a counterweight mechanism 6; the counterweight mechanism 6 consists of a hammer head 61 and a connecting rod 62, and the hammer head 61 is connected to the rotating shaft 43 through the connecting rod 62.

[0036] The counterweight mechanism 6 consists of two sets, which are symmetrically installed at both ends of the rotating shaft 43.

[0037] The hood-type flue gas switching valve of the present invention differs from the conventional flap-type flue gas switching valve in that it adopts a hood-shaped valve plate 3 and further adds a counterweight mechanism 6 on this basis.

[0038] The hood-shaped valve plate 3 consists of a valve plate 33, a sealing cover body 31, and an annular sealing ring 32, and is driven to rotate by a push rod mechanism 4. The push rod mechanism 4 consists of a push rod 41, a connecting rod 42, and a hinge mechanism. The hinge mechanism consists of an ear seat 44 and a rotating shaft 43. The valve plate 33, the push rod mechanism 4, and the hinge mechanism are all located outside the sealing cover body 31. The rotating shaft 43 is installed on the outside of the connecting pipe 1 through the ear seat 44. Preferably, there are two ear seats, and the rotating shaft 43 passes through the two ear seats 44, connecting the push rod 41 and the connecting rod 42 in the middle, and connecting a set of counterweight mechanisms 6 at each end. The middle of the connecting rod 42 is connected to the valve plate 33 through a fixed seat 45, and one end of the connecting rod 42 is connected to the rotating shaft 43.

[0039] This invention employs a hood-shaped valve plate 3 with a sloping top surface. When the hood-type flue gas conversion valve is in the closed state, rainwater will not accumulate on the top of the hood-shaped valve plate 3 during rainy weather. At the same time, the mating surface between the hood-shaped valve plate 3 and the connecting pipe 1 is horizontal. Thus, the mating between the coke quenching car flue pipe telescopic guide sleeve and the connecting pipe 1 is also a flat mating. Compared with the sloping mating method, this can avoid the problems of poor sealing effect and large air leakage caused by uneven distribution of contact stress. It also avoids shearing damage to the coke quenching car flue pipe telescopic guide sleeve and the connecting pipe 1.

[0040] The bottom of the cover-shaped valve plate 3 is provided with an annular sealing ring 32. When the cover-shaped valve plate 3 is pressed down, it comes into contact with the connecting pipe 1 and generates extrusion force. The annular sealing ring 32 deforms after being extruded, thereby improving the sealing effect at the joint.

[0041] The counterweight mechanism 6 consists of a hammer head 61 and a connecting rod 62. Two sets of counterweight mechanisms 6 are symmetrically installed at both ends of the rotating shaft 43. The middle part of the rotating shaft 43 is connected to the connecting rod 42 and the push rod 41, and the connecting rod 42 and the push rod 41 preferably adopt an integral structure.

[0042] like Figure 2 , Figure 4 As shown, during the coke oven dust removal operation, the external valve opener (such as hydraulic push rod 5) pushes push rod 41 until the hood-shaped valve plate 3 is fully opened. The telescopic guide sleeve of the coke quenching car flue pipe connects with the connecting pipe 1. The dust generated during coke discharge enters the dust removal main pipe 2 through the coke quenching car flue pipe, the telescopic guide sleeve of the coke quenching car flue pipe, and the connecting pipe 1, and is then sent to the coke oven dust removal ground station for purification. After the coke oven dust removal is completed, the connection between the telescopic guide sleeve of the coke quenching car flue pipe and the connecting pipe 1 is disconnected, the valve opener retracts, and the hood-shaped valve plate 3 is lowered and reset using the counterweight mechanism 6, completing the automatic closing of the hood-type flue gas switching valve.

[0043] In order to more directly reflect the present application, the embodiments of the present application are further described in combination with examples. The following examples are only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can obtain the technical solutions which are obvious within the technical range disclosed by the present application, including simple changes or equivalent replacements, all of which are within the protection scope of the present application.

[0044] [Example 1]

[0045] As shown in Figure 1 , Figure 2 , in the present embodiment, the cover type smoke gas conversion valve comprises a cover type valve plate 3, a push rod mechanism 4 and a weight mechanism 6; the cover type valve plate 3 is composed of a valve plate 33, a sealing cover body 31 and an annular sealing ring 32; the top surface of the sealing cover body 31 is a slope, and the bottom surface is a plane; when the cover type valve plate 3 closes the smoke gas inlet at the top of the butt joint pipe 1, the included angle between the top surface of the sealing cover body 31 and the horizontal plane is 3°.

[0046] In the present embodiment, the push rod mechanism 4 is composed of a push rod 41, a connecting rod 42 and a hinged mechanism; the middle part of the connecting rod 42 is provided with a fixed seat 45 which is fixedly connected with the valve plate 33; the end of the top surface of the sealing cover body 31 close to the hinged mechanism is lower than the other end.

[0047] In the present embodiment, the hinged mechanism is composed of an ear seat 44 and a rotating shaft 43; the ear seat 44 is two and is fixedly arranged on the outer wall of the butt joint pipe 1 in parallel; the rotating shaft 43 is supported by the two ear seats 44; the connecting rod 42 and the push rod 41 are an integral structure; the connecting part of the connecting rod 42 and the push rod 41 is connected with the middle part of the rotating shaft 43 between the two ear seats 44.

[0048] The weight mechanism 6 is composed of a hammer head 61 and a connecting rod 62; the hammer head 61 is connected with the rotating shaft 43 through the connecting rod 62. The weight mechanism 6 is two groups and is symmetrically installed at both ends of the rotating shaft 43.

[0049] [Example 2]

[0050] As shown in Figure 3 , Figure 4 , the difference between the present embodiment and Example 1 is that the end of the top surface of the sealing cover body 31 close to the hinged mechanism is lower than the other end; when the cover type valve plate 3 closes the smoke gas inlet at the top of the butt joint pipe 1, the included angle between the top surface of the sealing cover body 31 and the horizontal plane is 2°.

[0051] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto; any skilled person in the art can obtain the technical solutions which are obvious within the technical range disclosed by the present application, including simple changes or equivalent replacements, all of which are within the protection scope of the present application according to the technical solutions and the inventive concept of the present application.

Claims

1. A hooded flue gas transfer valve characterized by, The cover-shaped valve plate comprises a valve plate, a sealing cover body and an annular sealing ring; the top surface of the sealing cover body is an inclined surface, and the bottom surface is a flat surface; the bottom opening of the sealing cover body is connected to the dust removal main pipe through a butt joint pipe, and the annular sealing ring is arranged between the sealing cover body and the butt joint pipe; the valve plate is arranged at the top of the sealing cover body, and the push rod mechanism is used to drive the cover-shaped valve plate to rotate, so that the flue gas inlet at the top of the butt joint pipe is opened or closed.

2. A hooded flue gas conversion valve according to claim 1, characterised in that When the cover-shaped valve plate closes the flue gas inlet at the top of the butt joint pipe, the included angle between the top surface of the sealing cover body and the horizontal plane is greater than 2°.

3. A hooded flue gas conversion valve according to claim 1, characterised in that The push rod mechanism comprises a push rod, a connecting rod and a hinged mechanism; the connecting rod is fixedly connected to the valve plate, the connecting rod is connected to the push rod and is rotatably connected to the butt joint pipe through the hinged mechanism; one end of the top surface of the sealing cover body close to the hinged mechanism is lower than the other end.

4. A hooded flue gas conversion valve according to claim 1, characterized in that The push rod mechanism comprises a push rod, a connecting rod and a hinged mechanism; the connecting rod is fixedly connected to the valve plate, the connecting rod is connected to the push rod and is rotatably connected to the butt joint pipe through the hinged mechanism; one end of the top surface of the sealing cover body close to the hinged mechanism is higher than the other end.

5. A hooded flue gas conversion valve according to claim 3 or 4, characterised in that The hinged mechanism comprises an ear seat and a rotating shaft; the ear seat is fixed on the outer wall of the butt joint pipe, and the rotating shaft is supported by the ear seat; the connecting rod and the push rod are connected to the rotating shaft respectively.

6. A hooded flue gas conversion valve according to claim 5, characterised in that The connecting rod and the push rod are an integral structure.

7. A hooded flue gas conversion valve according to claim 3 or 4, characterised in that The connecting rod and the valve plate are connected through a fixing seat.

8. A hooded flue gas conversion valve according to claim 1, characterized in that The heavy hammer mechanism comprises a hammer head and a connecting rod; the hammer head is connected to the rotating shaft through the connecting rod.

9. A hooded flue gas conversion valve according to claim 8, characterised in that The heavy hammer mechanism comprises two groups, which are symmetrically installed at both ends of the rotating shaft.

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