CN210423813U - Four-way valve for switching between high-temperature flue gas without air channeling and air - Google Patents
Four-way valve for switching between high-temperature flue gas without air channeling and air Download PDFInfo
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- CN210423813U CN210423813U CN201920811003.1U CN201920811003U CN210423813U CN 210423813 U CN210423813 U CN 210423813U CN 201920811003 U CN201920811003 U CN 201920811003U CN 210423813 U CN210423813 U CN 210423813U
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Abstract
The utility model relates to a do not have cross valve for wind high temperature flue gas and air switch mainly comprises spare parts such as valve body, big end cover, bearing frame support, sealing brush, double-deck valve plate, center pin, sealed lid, double-layered silk graphite packing. The switch valve has the advantages that the valve body is of a hollow three-layer cylinder structure, the valve core adopts the double-layer valve plate, the double-layer sealing brush is mounted on the valve core and is always attached to the inner wall of the valve body, the double-layer valve plate rotates, switching between smoke and an air flow channel is achieved, and in addition, air channeling is avoided and leakage is reduced during reversing. Through multiple regulation and control modes, the flow of the flue gas duct can be subjected to stepless regulation during reversing, the flue gas duct is applied to the heat storage chamber in pairs, the preheater can be flexibly regulated from the minimum load to the maximum load, the regulation ratio of the load of the preheater is increased, the different driving loads of the device are adapted, and the stability of the exhaust gas temperature is ensured. The heat accumulating type air preheater is suitable for switching the flow direction of flue gas and air in a heat accumulating type air preheater of a petrochemical heating furnace flue gas waste heat recovery system.
Description
Technical Field
The utility model relates to a petrochemical heating furnace flue gas waste heat recovery system heat accumulation formula air preheater field particularly, relates to a do not have cross-over valve for wind high temperature flue gas and air switch.
Background
The four-way valve applied in the switching of the flow direction of the flue gas and the air of the heat accumulating type air preheater mostly has the problems of large leakage amount, short service life of a sealing structure, deformation of a valve plate and the like, and the switching is carried out in a way that the valve plate rotates in a reciprocating manner, namely, the scheme of the two-position four-way valve is adopted, and when the switching is carried out in a frequently reciprocating manner, an actuator and a component are subjected to the action of alternating stress and are easy. In addition, in a high temperature state, deformation of the inner member is difficult to control, affecting the sealing effect.
Especially single-blade formula cross valve, switch the switching-over formula when the valve plate, flue gas passageway and air passage have the transient problem of scurrying and leading to, because the flue gas pipeline is the negative pressure, the air pipeline is the malleation, should this, transient scurrying leads to a large amount of air to reveal in the flue gas, great pressure oscillation also appears with air system in the flue gas, the air feed of combustor is unstable and then makes the burning unstable, produce the incomplete phenomenon of burning, furnace pressure is unstable, lead to the risk that secondary furnace burning or explosion put out a fire even, great restriction heat accumulation formula air heater is in petrochemical heating furnace flue gas waste heat recovery system's popularization and application.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned technical problem among the correlation technique, the utility model provides a do not have high temperature flue gas of scurring wind and cross valve for air switch can solve the flow direction switching in-process scurring gas problem of leaking out of heat accumulation formula air heater flue gas and air.
In order to achieve the technical purpose, the technical scheme of the utility model is realized as follows:
a cross valve for switching between high-temperature flue gas without air channeling and air comprises a cylindrical valve body and large end covers arranged at two ends of the valve body, wherein a central shaft penetrating through the large end covers at two ends is arranged in the valve body, a bearing seat containing a bearing and a bearing seat support are arranged on the central shaft, the bearing seat support is fixedly welded on the large end covers at two ends, a wire-clamping graphite packing is filled at the joint of the central shaft and the large end covers, the wire-clamping graphite packing is fixedly pressed on the large end covers through a sealing cover by screws, a double-layer valve plate is fixedly arranged on the central shaft, sealing brushes are arranged on four sides of the double-layer valve plate and tightly attached to the inner walls of the valve body and the large end covers, four holes are uniformly distributed in the circumferential direction of a cylinder of the valve body, the distance between the four holes is slightly larger than the axial projection distance of the sealing surface of, the thickness of the double-layer valve plate is not less than that of each hole.
Preferably, the valve body is of a hollow three-layer cylindrical structure, the outermost layer of the valve body is a carbon steel plate manufacturing part, the innermost layer of the valve body is made of a stainless steel heat-resistant steel plate, and ceramic fiber cotton is filled in the middle of the valve body.
Preferably, four outer welding of hole has square pipe, square pipe tip is equipped with flange.
Preferably, the four holes are rectangular holes, namely a first hole, a second hole, a third hole and a fourth hole.
Preferably, the big end cover is of a three-layer thin circular cylindrical structure, the outer surface of the big end cover is made of a carbon steel plate, the inner surface of the big end cover is made of a stainless heat-resistant steel plate, and ceramic fiber cotton is filled in the middle of the big end cover.
Preferably, the center of the big end cover is provided with a round hole for the central shaft to pass through, a round pipe for filling the wire clamping graphite packing is arranged in the round hole, and the big end cover is fixed on the valve body through a screw.
Preferably, the double-layer valve plate is a stainless steel heat-resistant steel plate structural member.
Preferably, the double-layer valve plate adopts a combined structure, a certain distance is reserved between the double-layer valve plates, a high-temperature alloy combined sealing brush is arranged at the contact sealing position of each layer of valve plate of the double-layer valve plate and the inner wall of the valve body and the inner wall of the large end cover, and the sealing brush is in close contact with the inner wall of the valve body and the inner wall of the large end cover and has a certain deformation amount.
Preferably, the double-layer valve plate is formed by welding two arc-shaped sealing plates, two flat steel flange frames, two arc-shaped guide plates and two side plates, the flat steel flange frames are flat steel frames drilled with threaded holes and used for installing sealing brushes, the arc-shaped guide plates are used for connecting the two side plates, the two opposite sides of the side plates are parallel, the other two opposite sides of the side plates are isometric concentric arcs, a round hole for the central shaft to penetrate through for fixing is formed in the middle of the double-layer valve plate, and the double-layer valve plate and the central shaft are welded or connected and installed into a whole through a pin shaft.
Preferably, both ends of the central shaft are designed into square heads, splines or key grooves.
The utility model has the advantages that: the problem of heat accumulation formula air heater flue gas and the flow direction of air switch the in-process blowby gas leakage is solved, make the valve plate successfully cut off flue gas and flue gas all the time through adopting two valve plates, stopped switching-over formula blowby gas leakage problem, make flue gas duct internal pressure fluctuation drop to extremely low level, for heating furnace, boiler combustion system stable operation provide the assurance, can effectual improvement heat exchange efficiency of preheater.
In addition, the four-way valve can be used for stepless regulation of the flow of the smoke air passage during reversing through various regulation and control modes, and is applied to the heat storage chambers in pairs, so that the flexible regulation of the preheater from the minimum load to the maximum load is realized, and the regulation ratio of the load of the preheater is increased to adapt to different driving loads of the device.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a front view of a four-way valve for switching between high-temperature flue gas without blow-by and air according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a cross valve for switching between high temperature flue gas without blow-by and air according to an embodiment of the present invention.
Fig. 3 is a top view of a four-way valve for switching between high temperature flue gas without blow-by and air according to an embodiment of the present invention.
Fig. 4 is a front view of a double-layer valve plate according to an embodiment of the present invention.
Fig. 5 is a side view of a double layer valve plate according to an embodiment of the present invention.
Fig. 6 is a four-way valve reversing schematic diagram according to the embodiment of the present invention.
In the figure: 1. a valve body; 2. a large end cap; 3. a bearing seat; 4. a bearing mount bracket; 5. a sealing brush 6 and a double-layer valve plate; 7. a central shaft; 8. a sealing cover; 9. clamping a graphite packing; 6-1, arc sealing plates; 6-2, flat steel flange frames; 6-3, arc guide plates; 6-4, side plates; a. a first hole; b. air inlet/(flue gas outlet); c. an air outlet; d. flue gas outlet/(air inlet);
i, a cut-off position of 0 DEG/360 DEG; v, 90 °/270 ° cut-off position; IX, 180 DEG cut-off position; II/IV/VII, a → d/b → c working position; VI/VII/VIII, a → b/d → c working position.
In addition, in the figure, hole one (a) is a flue gas inlet, hole two (b) is an air inlet/flue gas outlet, hole three (c) is an air outlet, and hole four (d) is a flue gas outlet/air inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
As shown in fig. 1-3, according to the embodiment of the present invention, a four-way valve for switching between high temperature flue gas without blow-by and air mainly comprises a valve body 1, a large end cover 2, a bearing seat 3, a bearing seat support 4, a sealing brush 5, a double-layer valve plate 6, a central shaft 7, a sealing cover 8, a wire-clamping graphite packing 9, and other parts. Wherein the sealing brush 5 is arranged on the double-layer valve plate 6, the double-layer valve plate 6 and the central shaft 7 are arranged into a whole and then are arranged in the valve body 1 together; big end cover 2 totally two, install on valve body 1, constitute a hollow cavity together with valve body 1, big end cover 2 is all worn out at 7 both ends of center pin of double-deck valve plate 6, through bearing frame 3, bearing frame support 4 fixes on 2 surfaces of big end cover, therefore, under the condition of center pin 7 is rotated to external force, double-deck valve plate 6 can rotate in valve body 1, at this moment, seal brush 5 hugs closely valve body 1 and 2 inner walls of big end cover, separate into two passageways with valve body 1, along with the rotation of double-deck valve plate 6, the position of double-deck valve plate 6 is different, then two passageways or be in the end state, or communicate four trompils on the valve body 1 respectively, thereby realize the switching of flue gas channel runner.
The utility model discloses when being applied to petrochemical heating furnace flue gas waste heat recovery system heat accumulation formula air preheater system, cross valve flue gas entry an is connected with the chimney flue, and air outlet c is connected with the hot-blast main, and two other interface hole two b, hole four d are connected with the regenerator that the pre-heater corresponds respectively for switch flue gas, air flow direction.
In the preferred embodiment, the valve body 1 is a hollow three-layer cylindrical structure, four rectangular holes are uniformly distributed along the circumference of the cylinder, square pipes are welded, and the end part of each square pipe is provided with a connecting flange for connecting the four-way valve with a smoke air duct. A certain circumferential distance is reserved between the four rectangular holes in the inner cylinder wall of the valve body 1, the sealing area is the sealing area for static work of the double-layer valve plate 6, when the valve plate rotates to the sealing area, the complete separation of smoke and air is realized, and the four open holes in the valve body 1 are respectively communicated. This distance of this sealed area is slightly bigger than the sealed face axial projection distance of double-deck valve plate 6, and the sealed face axial projection distance of double-deck valve plate 6 is slightly bigger than four opening axial projection distances, and in addition, the thickness of double-deck valve plate 6 is not less than flue gas or air access & exit thickness, and like this, no matter double-deck valve plate 6 is in any position, can all realize the wall of flue gas, air. The valve body 1 has a three-layer cylindrical structure, wherein the outermost layer is a carbon steel plate, the innermost layer is in contact with high-temperature flue gas/air and is made of a stainless steel heat-resistant steel plate, and ceramic fiber cotton is filled in the middle of the valve body to insulate heat and preserve heat.
In the preferred embodiment, the large end cover 2 is a three-layer thin circular cylindrical structure, the outer surface of the large end cover is made of carbon steel plates, the inner surface of the large end cover is made of stainless heat-resistant steel plates, and ceramic fiber cotton is filled in the middle of the large end cover to insulate heat. The center of the big end cover 2 is provided with a round hole for the central shaft 7 to pass through, a round pipe is arranged in the round hole, and a wire-clamping graphite packing 9 for sealing the central shaft 7 is filled in the round pipe. The sealing cover 8 is fixed on the large end cover 2 through screws and used for tightly pressing the wire-clamping graphite packing 9, and smoke and air leakage is guaranteed. The large end cover 2 is fixed on the valve body 1 through screws when being installed.
As shown in fig. 4-5, in the preferred embodiment, the double-layer valve plate 6 is a stainless steel heat-resistant steel plate structure, and is formed by welding two arc-shaped sealing plates 6-1, two flat steel flange frames 6-2, two arc-shaped guide plates 6-3, and two side plates 6-4. The flat steel flange frame 6-2 is a flat steel frame with a threaded hole and is used for mounting the sealing brush 5. The arc-shaped guide plate 6-3 is used for connecting the two side plates and separating smoke and air, and the arc-shaped guide plate 6-3 can reduce the resistance of the smoke and the air passing through the four-way valve and reduce the pressure loss. Two opposite sides of the side plate 6-4 are parallel, the other two opposite sides are concentric arcs with equal diameter, and a round hole for the central shaft 7 to pass through for fixing is formed in the middle of the double-layer valve plate 6. The double-layer valve plate 6 and the central shaft 7 are welded or connected and installed into a whole by a pin shaft and the like, and when the central shaft 7 is rotated, the double-layer valve plate 6 rotates together.
In this preferred embodiment, double-deck valve plate 6 adopts composite structure, has certain distance between the double-deck valve plate, installs flexible sealing brush 5 with the contact seal department of valve body 1 inner tube on every layer of valve plate, can always cut off flue gas and air when double-deck valve plate 6 rotates arbitrary position, stops the valve plate switching-over and scurries wind, the influence of leaking out. Double-deck valve plate 6 is fixed on center pin 7, center pin 7 passes through the bearing and supports on cross valve big end cover 2, each one around big end cover 2, superalloy combined type sealing brush 5 is all installed to the four sides of double-deck valve plate 6, sealing brush 5 and 1 inner tube wall of valve body and 2 inner wall in close contact with of big end cover on every edge, and there is certain deformation volume, guarantee at double-deck valve plate 6 static or rotation in-process, sealing brush 5 laminates all the time and keeps away with 2 inner walls of big end cover in 1 inner tube of valve body, thereby disconnected flue gas and air.
In the preferred embodiment, two ends of the central shaft 7 pass through the large end cover 2 and are fixed on the large end cover 2 by welding through the bearing seat 3 (containing a bearing) and the bearing seat bracket 4. The two ends of the central shaft 7 can be designed into square heads, splines or key grooves for connecting a driving mechanism for transmission.
As shown in fig. 6, when the four-way valve in the preferred embodiment works, the double-layer valve plate 6 is rotated by the external driving device of the central shaft 7, each rotation of the double-layer valve plate 6 is a period, and the double-layer valve plate 6 is divided into eight typical working positions according to the position of the double-layer valve plate 6 in one period, wherein 0 ° (360 °), 90 °, 180 °, and 270 ° are cut-off positions; 45 °, 135 °, 225 °, 315 ° are maximum load full open positions. And the position of the double-layer valve plate 6 is reasonably controlled, so that a certain heat storage heat exchange unit of the preheater can be in various states such as heat exchange stopping, small-load throttling heat exchange, rated load heat exchange and the like, and the adjustable range of the load of the preheater is large.
The load of the preheater can be adjusted by controlling the reversing period and the reversing time interval of a plurality of groups of four-way valves or adjusting the rotating speed of the double-layer valve plate 6 by frequency conversion, so as to meet the control requirement of the exhaust gas temperature of the device.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cross valve for switching between high-temperature flue gas without blow-by and air comprises a cylindrical valve body (1) and large end covers (2) arranged at two ends of the valve body (1), and is characterized in that a central shaft (7) penetrating through the large end covers (2) at the two ends is arranged in the valve body (1), a bearing seat (3) containing a bearing and a bearing seat support (4) are arranged on the central shaft (7), the bearing seat support (4) is welded and fixed on the large end covers (2) at the two ends, a wire-clamping graphite packing (9) is filled at the joint of the central shaft (7) and the large end covers (2), the wire-clamping graphite packing (9) is fixedly pressed on the large end covers (2) through a sealing cover (8) by screws, a double-layer valve plate (6) is fixedly arranged on the central shaft (7), sealing brushes (5) are arranged on four sides of the double-layer valve plate (6), and the sealing brushes (5) are tightly attached to the inner, the valve body (1) is uniformly provided with four holes along the circumferential direction of the cylinder, the distance between the four holes is slightly larger than the axial projection distance of the sealing surface of the double-layer valve plate (6), the axial projection distance of the sealing surface of the double-layer valve plate (6) is slightly larger than the axial projection distance of each hole, and the thickness of the double-layer valve plate (6) is not smaller than that of each hole.
2. The cross valve for switching between high-temperature flue gas and air without blow-by according to claim 1, wherein the valve body (1) is a hollow three-layer cylindrical structure, the outermost layer of the valve body (1) is made of a carbon steel plate, the innermost layer of the valve body (1) is made of a stainless steel heat-resistant steel plate, and the middle of the valve body (1) is filled with ceramic fiber cotton.
3. The cross valve for switching between high-temperature flue gas and air without blow-by according to claim 1, wherein a square tube is welded outside the four holes, and a connecting flange is arranged at the end of the square tube.
4. The cross valve for switching between high temperature flue gas and air without blow-by according to claim 1, wherein the four holes are rectangular holes, namely a hole I (a), a hole II (b), a hole III (c) and a hole IV (d).
5. The cross valve for switching between high-temperature flue gas without blow-by and air according to claim 1, wherein the large end cover (2) is a three-layer thin circular cylindrical structure, the outer surface of the large end cover (2) is made of carbon steel plates, the inner surface of the large end cover (2) is made of stainless heat-resistant steel plates, and the middle of the large end cover (2) is filled with ceramic fiber cotton.
6. The cross valve for switching between high-temperature flue gas and air without blow-by according to claim 1, wherein a circular hole for a central shaft (7) to pass through is formed in the center of the large end cover (2), a circular tube for filling a wire-clamping graphite packing (9) is arranged in the circular hole, and the large end cover (2) is fixed on the valve body (1) through screws.
7. The cross-valve for switching between high-temperature flue gas and air without blow-by according to claim 1, wherein the double-layer valve plate (6) is a stainless steel heat-resistant plate structure.
8. The cross valve for switching between high-temperature flue gas and air without blow-by according to claim 1, wherein the double-layer valve plates (6) are of a combined structure, a certain distance is reserved between the double-layer valve plates (6), high-temperature alloy combined sealing brushes (5) are mounted at the contact sealing positions of each layer of valve plate of the double-layer valve plates (6) and the inner walls of the valve body (1) and the large end cover (2), and the sealing brushes (5) are in close contact with the inner walls of the valve body (1) and the large end cover (2) and have a certain deformation amount.
9. The cross-valve for switching between high temperature flue gas and air without blow-by according to claim 1, it is characterized in that the double-layer valve plate (6) is formed by welding two arc-shaped sealing plates (6-1), two flat steel flange frames (6-2), two arc-shaped guide plates (6-3) and two side plates (6-4), the flat steel flange frame (6-2) is a flat steel square frame drilled with a threaded hole and used for installing the sealing brush (5), the arc-shaped guide plate (6-3) is used for connecting two side plates (6-4), two opposite sides of the side plates (6-4) are parallel, the other two opposite sides of the side plate (6-4) are isometric concentric arcs, a round hole for a central shaft (7) to pass through for fixing is arranged in the middle of the double-layer valve plate (6), the double-layer valve plate (6) and the central shaft (7) are welded or connected and installed into a whole by a pin shaft.
10. The cross valve for switching between high temperature flue gas and air without blow-by according to claim 1, wherein both ends of the central shaft (7) are designed as square head, spline or key groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920811003.1U CN210423813U (en) | 2019-05-31 | 2019-05-31 | Four-way valve for switching between high-temperature flue gas without air channeling and air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920811003.1U CN210423813U (en) | 2019-05-31 | 2019-05-31 | Four-way valve for switching between high-temperature flue gas without air channeling and air |
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| Publication Number | Publication Date |
|---|---|
| CN210423813U true CN210423813U (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920811003.1U Active CN210423813U (en) | 2019-05-31 | 2019-05-31 | Four-way valve for switching between high-temperature flue gas without air channeling and air |
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| CN (1) | CN210423813U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159799A (en) * | 2019-05-31 | 2019-08-23 | 岳阳恒盛石化科技有限公司 | A kind of nothing alters wind high-temperature flue gas and air switching four-way valve |
-
2019
- 2019-05-31 CN CN201920811003.1U patent/CN210423813U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159799A (en) * | 2019-05-31 | 2019-08-23 | 岳阳恒盛石化科技有限公司 | A kind of nothing alters wind high-temperature flue gas and air switching four-way valve |
| CN110159799B (en) * | 2019-05-31 | 2024-07-30 | 岳阳恒盛石化科技有限公司 | Four-way valve for switching high-temperature flue gas and air without channeling |
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