CN111677897A - Double-medium auxiliary sealing technology for flat gate valve - Google Patents
Double-medium auxiliary sealing technology for flat gate valve Download PDFInfo
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- CN111677897A CN111677897A CN202010706776.0A CN202010706776A CN111677897A CN 111677897 A CN111677897 A CN 111677897A CN 202010706776 A CN202010706776 A CN 202010706776A CN 111677897 A CN111677897 A CN 111677897A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0227—Packings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The utility model provides a two medium auxiliary seal techniques for plate valve, include the first seal chamber that is sealed by liquid sealing medium and carry out the second seal chamber that seals by gaseous sealing medium, first seal chamber sets up between valve body and valve plate, continue to inject the sealing medium that is greater than the operating pressure of plate valve place reactor bottom into this first seal chamber until filling first seal chamber and realize first kind of medium auxiliary seal, the pressure-bearing valve chamber that the second seal chamber is enclosed by valve body, little casing and big casing, continue to inject the gaseous sealing medium that is greater than first seal chamber pressure into this second seal chamber, realize second kind of medium auxiliary seal. The technology improves the performance of equipment, reduces the influence on the quality of products, and optimizes the auxiliary sealing function of the existing equipment (especially needle coke production).
Description
Technical Field
The invention relates to high-temperature flat gate valve equipment in the field of petrochemical delayed coking, in particular to a double-medium auxiliary sealing technology for a flat gate valve.
Background
At present, more than 100 sets of common coke delayed coking units which take vacuum residue or vacuum residue blended asphalt and catalytic slurry oil as raw materials and take heavy crude oil, heavy fuel oil or coal tar as raw materials exist in China.
In recent years, with the rapid development of social economy, the demand of domestic needle coke is greatly increased, as a petroleum product with higher added value, the needle coke becomes one of the focuses of the petrochemical field again, not only the existing production enterprises compete to expand the capacity through technical transformation, but also the traditional petrochemical enterprises such as Shanghai petrochemical industry, Maoming petrochemical industry, Jinling petrochemical industry and the like are also intentionally entering the needle coke market.
In order to improve the automation level of the device, the bottom valve (bottom cover machine) of the coke tower of the coking device generally adopts a flat gate valve structure type as special equipment for automatically opening and closing the coke tower device. The needle coke process production puts higher performance requirements on a tower bottom valve in consideration of the quality index of a needle coke product.
The coking process is a key stage of needle coke production, the pretreated needle coke raw material enters a coke tower to undergo cracking, condensation and other reactions after the temperature is rapidly raised, and pressurization treatment is carried out during coke formation to promote growth and fusion of mesophase spherule and obtain high-performance delayed coke, which is also called green coke. When needle coke is produced, technological parameters such as coking temperature, coking pressure, coking circulation ratio, calcination temperature and the like need to be accurately controlled.
The coking temperature is one of the most critical factors influencing the quality of needle coke, and at a lower temperature, the mesophase conversion is difficult to occur; when the temperature is too high, the pellets are immediately fused once formed, and there is no chance of sufficient growth, it is difficult to obtain a wide-area mesophase, and needle coke having a low expansion coefficient cannot be produced, and trial and error are necessary to determine the optimum thermal conversion temperature. The yield of coke is increased correspondingly with the increase of the pressure at the top of the coking tower, the density is increased, but the excessive pressure will affect the escape rate of gas, the raw material is difficult to form needle shape, and the pressure change operation is generally adopted, namely, the pressure is adjusted, so that the gas has enough escape time before solidification to generate needle-shaped structures. Besides temperature and pressure, reaction time also has great influence on a coking process, more energy can be accumulated for the system by prolonging the time, formed mesophase macromolecules are further polymerized and fused to form larger spheres, the time and the temperature are often interacted to influence mesophase change, and in a proper temperature range, the longer the residence time is, the more favorable the growth and fusion of small spheres are. The existing delayed coking device is fully optimized and perfected and is the main task of improving the existing delayed coking technology.
Through further optimization and promotion of the bottom valve product structure and the sealing technology of the common petroleum coke tower of the existing coking device, the requirement of the needle coke production process is met, the equipment performance of the bottom valve of the tower is promoted, and the control level of the equipment production system of the needle coke device is promoted.
The existing bottom cover machine is simple in structure and good in manufacturing manufacturability. In practical production and use, the metal sealing pair deformation caused by high-temperature media needs steam to carry out effective auxiliary sealing compensation. If too much steam enters the reaction tower, the coke quality of the needle coke is affected. Therefore, the prior sealing structure is optimized and improved, and auxiliary sealing of the equipment by other media is needed, so that the equipment obtains better use effect.
Disclosure of Invention
In order to solve the technical problem, the performance of equipment is improved, the influence on the quality of products is reduced, the auxiliary sealing function of the existing equipment (especially needle coke production) is optimized, and a double-medium auxiliary sealing technology for a flat gate valve is provided.
In order to realize the technical purpose, the adopted technical scheme is as follows: the utility model provides a two medium auxiliary seal techniques for plate valve, include the first seal chamber that is sealed by liquid sealing medium and carry out the second seal chamber that seals by gaseous sealing medium, first seal chamber sets up between valve body and valve plate, continue to inject the sealing medium that is greater than the operating pressure of plate valve place reactor bottom into this first seal chamber until filling first seal chamber and realize first kind of medium auxiliary seal, the pressure-bearing valve chamber that the second seal chamber is enclosed by valve body, little casing and big casing, continue to inject the gaseous sealing medium that is greater than first seal chamber pressure into this second seal chamber, realize second kind of medium auxiliary seal.
The first sealing cavity is composed of a collecting ring groove on the sealing surface of the valve seat and a sealing surface of the valve plate, annular collecting ring grooves are formed in the upper surface and the lower surface of the valve seat, a plurality of channels communicated with the upper collecting ring groove and the lower collecting ring groove are formed in the valve seat, and liquid sealing media are injected into the collecting ring groove in the upper surface of the valve seat to achieve first medium auxiliary sealing.
The valve body is internally provided with a flow passage, an inlet of the flow passage is connected with the outside and used for injecting liquid sealing medium, and an outlet of the flow passage is arranged corresponding to the upper surface flow collecting ring groove of the valve seat.
The liquid sealing medium is wax oil.
The gas sealing medium is steam.
The pressure of the first sealing cavity, the pressure of the second sealing cavity and the operation pressure at the bottom of the reactor are controlled in an interlocking manner, the pressure control hardware part of a medium is realized by two independent control module assemblies, the two control module assemblies respectively control the pressure and flow supply of a liquid sealing medium and a gas sealing medium, and the two control module assemblies respectively undertake the dynamic regulation function control of the pressure and the flow of the sealing medium; and pressure difference adjustment is set between the two control module assemblies according to the requirement of sealing control.
The invention has the beneficial effects that: the flat gate valve adopts a double-medium auxiliary sealing structure and a control technology, can meet the process production requirements of needle coke products, and effectively improves the automation level of flat gate valve equipment in the field of needle coke production.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a media seal pressure trend chart of the present invention.
Fig. 3 is a cross-sectional view of the housing sealing medium passage of the present invention.
FIG. 4 is a cross-sectional view of a first capsule media path of the present invention.
Fig. 5 is a cross-sectional view of a flow channel of the present invention.
Fig. 6 is an isometric view of the valve seat of the present invention.
Fig. 7 is an enlarged cross-sectional view of the valve seat of the present invention.
Fig. 8 is a schematic diagram of the joint control of the present invention.
Fig. 9 is an isometric view of the sealing medium circuit of the present invention.
In the figure: 1. the device comprises a small shell, 2, a supporting seat, 3, a reactor, 4, a valve seat, 5, a valve plate, 6, a valve body, 7, a large shell, 8, an overflowing channel, 9, an interface flange, 10, a flow collecting ring groove, 11 gate valves, 12, a pore plate, 13, a transmitter, 14, a regulating valve, 15, a gate valve, 16, a stop valve, 17, a one-way valve, 18, a first sealing cavity, 19 and a second sealing cavity.
Detailed Description
As shown in fig. 1 and 2, a double-medium auxiliary sealing technology for a flat gate valve includes a first seal cavity 18 sealed by a liquid sealing medium and a second seal cavity 19 sealed by a gas sealing medium, the first seal cavity 18 is disposed between a valve body 6 and a valve plate 5, the first seal cavity 18 is continuously filled with a sealing medium larger than the operating pressure of the bottom of a reactor where the flat gate valve is located until the first seal cavity 1 is filled to realize auxiliary sealing of the first medium between the valve body 6 and the valve plate 5, the second seal cavity 19 is a pressure-bearing valve cavity enclosed by the valve body 6, a small housing 1 and a large housing 7, and the second seal cavity 19 is continuously filled with the gas sealing medium larger than the pressure of the first seal cavity 18 to realize auxiliary sealing of the second medium.
As shown in fig. 4, the valve body 6 is a conventional component of a flat gate valve, and includes a valve body, a valve seat 4 connected to or located on the valve body, and a support seat 2.
The large and small shells can be manufactured and formed by casting or welding, and the required structural pattern of the medium channel is cut and machined according to requirements.
As shown in fig. 3, the second seal chamber 18 is a conventional structure of a flat gate valve, which communicates the small housing, the large housing, and the valve body, and is enclosed outside the first seal chamber 18.
As shown in fig. 4 and 6, the first sealing cavity 18 is implemented by a valve seat 4, the valve seat is forged and formed by high-temperature alloy steel, the collecting ring groove 10 and the channel on the valve seat 4 are formed by cutting, the upper surface sealing surface of the valve seat 4 is attached to the valve body 6, the lower surface sealing surface of the valve seat is attached to the valve plate 5, the upper surface and the lower surface of the valve seat 4 are both provided with annular collecting ring grooves 10, a plurality of channels communicating the upper collecting ring groove 10 with the lower collecting ring groove 10 are formed in the valve seat 4, a liquid sealing medium is injected into the collecting ring groove 10 on the upper surface of the valve seat 4 to realize first medium auxiliary sealing, the liquid sealing medium firstly flows into the collecting ring groove on the upper surface and then flows into the lower surface collecting ring groove.
As shown in fig. 5, an overflow channel 8 is arranged in the valve body 6, an inlet of the overflow channel 8 is connected with the outside for injecting a liquid sealing medium, an outlet of the overflow channel 8 is arranged corresponding to the upper surface collecting ring groove 10 of the valve seat, an inlet of the overflow channel 8 can be connected with an interface flange 9 for connecting with an external pipeline, and the interface flange 9 is arranged on the valve body 6. The overflowing channel 8 can only pass through the first sealing cavity 1 and cannot guide the flow to other parts, the flat gate valve shell can be manufactured and formed through casting or welding, and the overflowing channel 8 is cut and processed according to requirements.
The liquid sealing medium is wax oil or diesel oil, and is a byproduct obtained from a reactor (coke tower). The gas sealing medium is steam.
As shown in fig. 8, the pressure of the first sealed cavity 18, the pressure of the second sealed cavity 19 and the operating pressure at the bottom of the reactor are jointly controlled, the pressure control hardware part of the medium is realized by two sets of independent control module assemblies, the two sets of control module assemblies respectively control the pressure and flow supply of the liquid sealing medium and the gas sealing medium, and the two sets of control module assemblies respectively undertake the dynamic regulation function control of the pressure and flow of the sealing medium; pressure difference regulation is set between the two control module assemblies according to the requirement of sealing control, gradient management is realized, and the servo requirement of the process production (variable pressure operation) of the reactor is ensured. The plate valve requires that the pressure of the sealing medium (such as wax oil) in the first seal chamber is continuously maintained at a constant value higher than the operating pressure deltap at the bottom of the reactor; the casing requires that the pressure of the sealing medium (such as steam) in the second seal cavity is continuously maintained at a constant value higher than the pressure deltap of the medium (wax oil) in the first seal cavity. When the pressure value at the bottom of the reactor is detected to be P, the supply pressure of the liquid sealing medium is P +. DELTA.P, the supply pressure of the gas sealing medium is P +. DELTA.P ',. DELTA.P ' >. DELTA.P, and the most convenient design result is that. DELTA.P ' = 2. DELTA.P. The pressure difference is required to ensure that the medium raw material in the reactor cannot leak into the cavity of the tower bottom valve to cause sealing failure.
As shown in fig. 8, a flow control schematic diagram of a pipeline meter shows that the dual-medium auxiliary sealing control technology is composed of two different sealing medium control loops. Each set of control module component comprises control elements such as a gate valve, a stop valve, a one-way valve, a regulating valve, a pressure transmitter, a differential pressure transmitter, an orifice plate, a pressure gauge and the like. Each set of control module component has the functions of dynamically adjusting pressure and flow, and has the control means of displaying, measuring, pressure setting and the like, and the two sets of control module components carry out pressure interlocking control and are compared with the operating pressure at the bottom of a coke tower (reactor) for continuous dynamic measurement, so that the realization of the auxiliary sealing function of a loop is ensured. In fig. 8, PY is a differential pressure calculation module, PV is a regulator valve, PT is a pressure transmitter, PG is a pressure gauge, and FT is a flow transmitter.
Example 1:
as shown in fig. 1, a double-medium auxiliary sealing technology for a flat gate valve mainly comprises a small housing 1, a valve body 6 and a large housing 7 which together form a pressure-bearing valve cavity, which is a second sealing cavity 19 of the device, and a liquid sealing medium (such as steam) is injected into the second sealing cavity 19 for sealing by an interface flange (shown in fig. 3).
As shown in fig. 4, the first sealing chamber 18 is located at the original sealing position where the valve body contacts the valve plate, and the valve seat on the valve seat 4 and the valve plate 6 together form a pressure-bearing sealing chamber, which is the first sealing chamber of the device. Sealing medium (such as wax oil) is injected from the interface flange 9 and passes through the flow channel 8 to the sealing cavity to seal the medium raw material, so that the raw oil in the coke tower is prevented from leaking from the sealing surface.
As shown in fig. 5, 6 and 7, the seal of the first seal cavity passes from the interface flange, through the flow channel to the upper collecting ring groove and then through the channel to the lower collecting ring groove until the set pressure is reached.
As shown in fig. 8 and 9, the sealing medium loop includes a pipeline, a pipeline gate valve 11, an orifice plate 12 for limiting the flow, a transmitter 13 for measuring the pressure of the pipeline, a medium flow regulating valve 14, a pipeline emptying gate valve 15, a bypass stop valve 16, a check valve 17, a pressure gauge and other elements. The transformer 13 transmits a sealing medium pressure signal to the control system in real time, and the system processes the signal and sends the signal to the regulating valve 14 to set pressure so as to ensure that the double-medium auxiliary seal conforms to the set pressure difference.
Claims (6)
1. A double-medium auxiliary sealing technology for a flat gate valve is characterized in that: the sealing device comprises a first sealing cavity (18) sealed by liquid sealing medium and a second sealing cavity (19) sealed by gas sealing medium, wherein the first sealing cavity (18) is arranged between a valve body (6) and a valve plate (5), the sealing medium which is larger than the operating pressure of the bottom of a reactor with a flat gate valve is continuously injected into the first sealing cavity (18) until the first sealing cavity (1) is filled to realize first medium auxiliary sealing, the second sealing cavity (19) is enclosed by the valve body (6), a small shell (1) and a large shell (7), the gas sealing medium which is larger than the pressure of the first sealing cavity (18) is continuously injected into the second sealing cavity (19), and second medium auxiliary sealing is realized.
2. A dual media assisted sealing technique for a plate valve as claimed in claim 1 wherein: the first sealing cavity (18) is composed of a collecting ring groove (10) on the sealing surface of the valve seat (4) and a valve plate sealing surface, annular collecting ring grooves (10) are formed in the upper surface and the lower surface of the valve seat (4), a plurality of channels communicated with the upper collecting ring groove and the lower collecting ring groove (10) are formed in the valve seat (4), and liquid sealing media are injected into the collecting ring groove (10) on the upper surface of the valve seat (4) to realize first medium auxiliary sealing.
3. A double media assisted sealing technique for a plate valve as claimed in claim 2 wherein: an overflowing channel (8) is arranged in the valve body (6), an inlet of the overflowing channel (8) is connected with the outside and used for injecting liquid sealing media, and an outlet of the overflowing channel (8) is arranged corresponding to the upper surface collecting ring groove (10) of the sealing ring).
4. A double media assisted sealing technique for a plate gate valve as claimed in claim 1, 2 or 3 wherein: the liquid sealing medium is wax oil or diesel oil.
5. A dual media assisted sealing technique for a plate valve as claimed in claim 1 wherein: the gas sealing medium is steam.
6. A dual media assisted sealing technique for a plate valve as claimed in claim 1 wherein: the pressure of a first sealed cavity (18), the pressure of a second sealed cavity (19) and the operation pressure at the bottom of the reactor are controlled in an interlocking manner, the pressure control hardware part of a medium is realized by two independent control module assemblies, the two control module assemblies respectively control the pressure and flow supply of a liquid sealing medium and a gas sealing medium, and the two control module assemblies respectively undertake the dynamic regulation function control of the pressure and the flow of the sealing medium; and pressure difference adjustment is set between the two control module assemblies according to the requirement of sealing control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706776.0A CN111677897A (en) | 2020-07-21 | 2020-07-21 | Double-medium auxiliary sealing technology for flat gate valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010706776.0A CN111677897A (en) | 2020-07-21 | 2020-07-21 | Double-medium auxiliary sealing technology for flat gate valve |
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| Publication Number | Publication Date |
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| CN111677897A true CN111677897A (en) | 2020-09-18 |
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| CN202010706776.0A Pending CN111677897A (en) | 2020-07-21 | 2020-07-21 | Double-medium auxiliary sealing technology for flat gate valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833853A (en) * | 2021-08-25 | 2021-12-24 | 中国华能集团清洁能源技术研究院有限公司 | Seal assembly |
-
2020
- 2020-07-21 CN CN202010706776.0A patent/CN111677897A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113833853A (en) * | 2021-08-25 | 2021-12-24 | 中国华能集团清洁能源技术研究院有限公司 | Seal assembly |
| CN113833853B (en) * | 2021-08-25 | 2024-02-06 | 中国华能集团清洁能源技术研究院有限公司 | Seal assembly |
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