CN110822285A - Vapor delivery system and method - Google Patents
Vapor delivery system and method Download PDFInfo
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- CN110822285A CN110822285A CN201911115842.0A CN201911115842A CN110822285A CN 110822285 A CN110822285 A CN 110822285A CN 201911115842 A CN201911115842 A CN 201911115842A CN 110822285 A CN110822285 A CN 110822285A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/06—Pipe-line systems for gases or vapours for steam
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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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
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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
- F16T—STEAM TRAPS OR LIKE APPARATUS FOR DRAINING-OFF LIQUIDS FROM ENCLOSURES PREDOMINANTLY CONTAINING GASES OR VAPOURS
- F16T1/00—Steam traps or like apparatus for draining-off liquids from enclosures predominantly containing gases or vapours, e.g. gas lines, steam lines, containers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Mechanical Engineering (AREA)
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Abstract
The invention relates to a steam delivery system and a method, wherein the steam delivery system comprises a first delivery pipe (1), a first control valve (2), a second delivery pipe (4), a second control valve (5) and a controller (8), the first delivery pipe (1) is used for delivering steam, the first control valve (2) is arranged on the first delivery pipe (1) and used for adjusting the flow of the first delivery pipe (1), the second delivery pipe (4) is communicated with the first delivery pipe (1) and used for delivering condensed water generated in the first delivery pipe (1), the second control valve (5) is arranged on the second delivery pipe (4) and used for adjusting the flow of the second delivery pipe (4), and the controller (8) is in signal connection with the first control valve (2) and the second control valve (5) so as to control the opening degrees of the first control valve (2) and the second control valve (5). According to the invention, the controller replaces manpower to realize pipe heating, so that the water hammer phenomenon is effectively controlled, and the stability and the safety of the steam conveying system are improved.
Description
Technical Field
The invention relates to the technical field of tobacco machinery, in particular to a steam conveying system and a steam conveying method.
Background
When the steam system resumes production after stopping production, a large amount of condensed water can be accumulated in the steam pipeline, if the opening speed of the main valve of the steam supply valve is high, the system has insufficient preheating time, and the condensed water can be discharged in time, so that the system is easy to generate a water hammer phenomenon. The main harm of the phenomenon of water hammer is that when the condensed water reaches the corner of the pipeline or the valve equipment, the kinetic energy is released to the pipe wall or the equipment at the corner in a pressure mode from high speed to static suddenly, if the water hammer speed is high or the quality of the condensed water is high, the pipeline and various valves on the pipeline are easily damaged, and the pipe wall is broken in serious cases. The other harm of the over-quick opening speed of the main valve of the steam supply valve is that the temperature of the pipeline rises too fast, the temperature of the pipeline is less than 10 ℃ in a winter shutdown state, the temperature of 1MPa saturated steam is about 184 ℃, and the short-time over-quick temperature rise can cause a series of problems of deformation, breakage and the like of the pipeline.
In order to uniformly and slowly heat a steam pipeline, a valve, a flange and the like, simultaneously discharge condensed water in the pipeline and prevent a series of hazards such as pipeline damage or valve leakage caused by water hammer in the pipeline, the steam pipeline can be preheated, and the preheating process is generally called as 'warm pipe'. Whether the 'warm pipe' is ideal or not is judged mainly by the discharge condition of condensed water and the temperature rise condition of a pipeline valve.
Drainage and 'heating pipe' are generally performed by manual operation in the industry at present, but the manual operation has the following problems:
firstly, the time required by the heating pipe is long, the labor intensity is high, and the requirement on the professional moral literacy of operators is high;
and secondly, for the stop valve commonly used by the steam main pipe, the accuracy of the opening degree of the valve is difficult to master.
The common consequence of the two problems is that the phenomenon of water hammer still happens occasionally, which brings uncertain factors to the stable operation of the steam system and has potential safety hazard.
It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a steam conveying system and a steam conveying method, which can reduce the occurrence of water hammer and improve the stability of the steam conveying system.
To achieve the above object, the present invention provides a vapor delivery system comprising:
a first delivery pipe for delivering steam;
the first control valve is arranged on the first conveying pipe and used for adjusting the flow of the first conveying pipe;
the second conveying pipe is communicated with the first conveying pipe and is used for conveying condensed water generated in the first conveying pipe;
the second control valve is arranged on the second conveying pipe and used for adjusting the flow of the second conveying pipe; and
and the controller is in signal connection with the first control valve and the second control valve so as to control the opening degrees of the first control valve and the second control valve.
In some embodiments, the steam delivery system further includes a third delivery pipe in communication with the first delivery pipe and a trap disposed on the third delivery pipe.
In some embodiments, the vapor delivery system further includes a fourth delivery conduit in communication with the first delivery conduit, the second delivery conduit and the third delivery conduit each being in communication with the fourth delivery conduit.
In some embodiments, the steam delivery system further comprises a detection device in signal connection with the controller, the detection device is used for detecting the steam temperature and the steam pressure in the first delivery pipe and the pipe wall temperature and the pipe wall pressure of the first delivery pipe, and the controller controls the opening degree of the first control valve and the second control valve according to the detection result of the detection device.
In some embodiments, the detection means comprises first detection means, provided upstream of the first control valve, for detecting the steam temperature and the steam pressure within the first delivery pipe.
In some embodiments, the detection means further comprises second detection means, arranged downstream of the first control valve, for detecting the temperature and pressure of the wall of the first delivery pipe.
In some embodiments, the sensing device further comprises a third sensing device disposed downstream of the second sensing device and adjacent to the distal end of the first delivery tube for sensing the temperature and pressure of the wall of the first delivery tube.
In order to achieve the above object, the present invention also provides a steam delivery method, comprising:
signal connecting a first control valve and a second control valve to a controller, wherein the first control valve is arranged on a first conveying pipe for conveying steam, the second control valve is arranged on a second conveying pipe for conveying condensed water generated in the first conveying pipe, and the second conveying pipe is communicated with the first conveying pipe;
the controller sends out a signal for opening the second control valve;
after the first preset time, the controller sends out a signal for closing the second control valve and simultaneously sends out a signal for opening the first control valve.
In some embodiments, before the controller issues the signal to open the second control valve, the method further comprises:
detecting a steam temperature and a steam pressure in the pipe at a first detection position upstream of the first control valve;
the controller's operation of signaling the second control valve to open includes:
when the steam temperature and the steam pressure reach a first preset condition, the controller sends out a signal for opening the second control valve.
In some embodiments, the operation of simultaneously signaling the opening of the first control valve comprises:
and simultaneously sending a signal which enables the first control valve to be opened to a first proportion of the total opening degree at a constant speed or a non-constant speed within a second preset time.
In some embodiments, the operation of simultaneously signaling the first control valve open further comprises:
and detecting a first pipe wall temperature and a first pipe wall pressure at a second detection position on the downstream of the first control valve, and when the first pipe wall temperature and the first pipe wall pressure reach a second preset condition, sending a signal of a second proportion by which the first control valve is opened to the total opening at a constant speed or a non-constant speed within a third preset time by the controller, wherein the second proportion is greater than the first proportion.
In some embodiments, the operation of simultaneously signaling the first control valve open further comprises:
and detecting a second pipe wall temperature and a second pipe wall pressure at a third detection position which is located at the downstream of the second detection position and is adjacent to the tail end of the first conveying pipe, and when the second pipe wall temperature and the second pipe wall pressure reach a third preset condition, sending a signal that the first control valve is opened to the maximum opening degree at a constant speed or a non-constant speed within fourth preset time by the controller.
In some embodiments, the operation of simultaneously signaling the first control valve open further comprises:
after the first control valve is opened to the maximum opening, when the temperature of the second pipe wall and the pressure of the second pipe wall reach a fourth preset condition, the controller sends a signal for reducing the opening of the first control valve to a third proportion of the total opening.
In some embodiments, the vapor delivery method further comprises:
after the fifth preset time, the controller sends out a signal for closing the first control valve at a constant speed or a non-constant speed within the sixth preset time;
after the first control valve is closed, the controller sends out a signal for opening the second control valve;
after a seventh preset time, the controller sends a signal to close the second control valve.
Based on the technical scheme, the controller automatically controls the first control valve and the second control valve to be opened, manual work is replaced, labor cost is saved, influence caused by difficulty in controlling the opening precision of the valve body in manual operation can be avoided, the phenomenon of water hammer is effectively controlled, and the stability and the safety of the steam conveying system are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a vapor delivery system according to one embodiment of the present invention.
In the figure:
1. a first delivery pipe; 2. a first control valve; 3. a fourth delivery pipe; 4. a second delivery pipe; 5. a second control valve; 6. a third delivery pipe; 7. a drain valve; 8. a controller; 9. a first detection device; 10. a second detection device; 11. and a third detection device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.
As shown in fig. 1, in an embodiment of the steam delivery system provided by the present invention, the delivery system includes a first delivery pipe 1, a first control valve 2, a second delivery pipe 4, a second control valve 5 and a controller 8, the first delivery pipe 1 is used for delivering steam, the first control valve 2 is disposed on the first delivery pipe 1 for regulating the flow rate of the first delivery pipe 1, the second delivery pipe 4 is communicated with the first delivery pipe 1 for delivering condensed water generated in the first delivery pipe 1, the second control valve 5 is disposed on the second delivery pipe 4 for regulating the flow rate of the second delivery pipe 4, and the controller 8 is in signal connection with the first control valve 2 and the second control valve 5 to control the opening degrees of the first control valve 2 and the second control valve 5.
In the above embodiment, the controller 8 automatically controls the opening of the first control valve 2 and the second control valve 5, so that the manual operation is replaced, the labor cost is saved, the influence caused by the difficulty in controlling the opening precision of the valve body in the manual operation can be avoided, the occurrence of the phenomenon of water hammer is effectively controlled, and the stability and the safety of the steam conveying system are improved.
The controller 8 may control at least one of the opening time (i.e., when to open), the opening size, the opening speed, and the opening duration of the first and second control valves 2 and 5.
The steam delivery system also comprises a third delivery pipe 6 and a drain valve 7, wherein the third delivery pipe 6 is communicated with the first delivery pipe 1, and the drain valve 7 is arranged on the third delivery pipe 6.
The drain valve 7 is in a normally open state in the process of conveying steam, and the drain valve 7 is arranged, so that the drain state can be always kept after the steam pressure is normal, and condensed water in a pipeline can be discharged in time.
Steam delivery system still includes fourth conveyer pipe 3, and fourth conveyer pipe 3 is the bypass pipeline, and fourth conveyer pipe 3 and first conveyer pipe 1 intercommunication, second conveyer pipe 4 and third conveyer pipe 6 all communicate with fourth conveyer pipe 3.
The steam delivery system further comprises a detection device in signal connection with the controller 8, the detection device is used for detecting the steam temperature and the steam pressure in the first delivery pipe 1 and the pipe wall temperature and the pipe wall pressure of the first delivery pipe 1, and the controller 8 controls the opening degree of the first control valve 2 and the opening degree of the second control valve 5 according to the detection result of the detection device.
Through setting up detection device, can in time monitor steam state and pipe wall state in the pipeline to for controller 8's control provides data support, make controller 8 can replace the manual work effectively and realize "warm pipe" purpose, the emergence of effective control "water hammer" phenomenon.
The detection means comprise first detection means 9, the first detection means 9 being arranged upstream of the first control valve 2, the first detection means 9 being arranged to detect the steam temperature and the steam pressure in the first delivery pipe 1.
The distance between the first detection means 9 and the steam source, such as a boiler, may be 2m to 3 m.
By providing the first detection means 9 it is possible to detect whether steam has reached upstream of the first control valve 2, thereby providing data support for when the controller 8 opens the second control valve 5 for draining off condensate.
The detection means further comprise second detection means 10, the second detection means 10 being arranged downstream of the first control valve 2, the second detection means 10 being adapted to detect the temperature and pressure of the wall of the first delivery pipe 1.
By providing the second detection means 10, the state of the pipe downstream of the first control valve 2 can be detected, so that the controller 8 can control the opening speed and the opening degree of the first control valve 2 according to the detection result of the second detection means 10.
The detection means further comprise third detection means 11, the third detection means 11 being arranged downstream of the second detection means 10 and adjacent to the end of the first transport pipe 1, the third detection means 11 being arranged to detect the temperature and pressure of the pipe wall of the first transport pipe 1.
The second detection means 10 may be located in an intermediate position between the first control valve 2 and the third detection means 11, the distance between the second detection means 10 and the first control valve 2 being equal to the distance between the second detection means 10 and the third detection means 11.
The end of the first transport pipe 1 is the end of the first transport pipe 1 close to the part connected to the downstream of the first transport pipe 1, and the distance between the third detection device 11 and the part may be 1m to 2 m.
By providing the third detection means 11, it is possible to detect the condition of the duct adjacent the end of the first delivery pipe 1 and thereby provide the controller 8 with information about the progress of the "warm pipe" so that the controller 8 can accordingly determine whether the first control valve 2 can be opened to the maximum opening degree.
Through setting up first detection device 9, second detection device 10 and third detection device 11, controller 8 can be according to first detection device 9, the progress of opening of the first control valve 2 of detection result effective control of second detection device 10 and third detection device 11, replace the manual work to realize "warm pipe" purpose, compare in manual operation simultaneously, controller 8 uses steam state and pipeline state to control the progress of opening of first control valve 2 as the basis, can make pipeline temperature rise slowly more accurately, effectively protect pipeline and relevant control valve body, the security is improved.
The first detecting means 9, the second detecting means 10 and the third detecting means 11 may be sensors capable of detecting temperature and pressure.
The invention also provides a steam delivery method, which comprises the following steps:
signal-connecting a first control valve 2 and a second control valve 5 to a controller 8, the first control valve 2 being provided on a first delivery pipe 1 for delivering steam, the second control valve 5 being provided on a second delivery pipe 4 for delivering condensed water generated in the first delivery pipe 1, the second delivery pipe 4 being in communication with the first delivery pipe 1;
the controller 8 sends a signal to open the second control valve 5;
after a first preset time, the controller 8 signals the second control valve 5 to close, and at the same time signals the first control valve 2 to open.
Therefore, before the first control valve 2 is opened, the condensed water remained in the first conveying pipe 1 can be output through the second conveying pipe 4, the phenomenon of water hammer is avoided, and the damage of the condensed water to pipelines or other parts is avoided.
In some embodiments, before the controller 8 sends out the signal to open the second control valve 5, the method further comprises:
detecting the steam temperature and the steam pressure inside the pipeline at a first detection position (corresponding to the position of the first detection device 9) upstream of the first control valve 2;
the operation of the controller 8 to signal the opening of the second control valve 5 comprises:
when the steam temperature and the steam pressure reach a first preset condition, the controller 8 signals the opening of the second control valve 5.
By detecting the state of the steam upstream of the first control valve 2, the controller 8 can determine whether steam has reached the upstream of the first control valve 2 and thus when to open the second control valve 5.
The first preset condition may be that the steam temperature reaches a first preset temperature and the steam pressure reaches a first preset pressure. The specific values of the first preset temperature and the first preset pressure can be flexibly set according to the actual conditions.
In some embodiments, the operation of simultaneously signaling the opening of the first control valve 2 comprises:
at the same time, a signal is emitted which enables the first control valve 2 to be opened to a first proportion of the total opening degree at a constant speed or at a non-constant speed within a second preset time.
For example, the first ratio may be 5%, 8%, 10%, or the like.
In some embodiments, the operation of simultaneously signaling the opening of the first control valve 2 further comprises:
and detecting a first pipe wall temperature and a first pipe wall pressure at a second detection position (corresponding to the position of the second detection device 10) at the downstream of the first control valve 2, wherein when the first pipe wall temperature and the first pipe wall pressure reach a second preset condition, the controller 8 sends a signal which enables the first control valve 2 to be opened at a constant speed or at a non-constant speed within a third preset time to reach a second proportion of the total opening, and the second proportion is greater than the first proportion.
By detecting the state of the pipe wall downstream of the first control valve 2, the controller 8 can determine whether the opening degree of the first control valve 2 can be increased. The second preset condition may be that the temperature of the first pipe wall reaches
And the pressure of the first pipe wall reaches a second preset pressure at a second preset temperature. The specific values of the second preset temperature and the second preset pressure can be flexibly set according to the actual conditions.
The second proportion may be 10%, 15%, 18%, 20%, etc.
In some embodiments, the operation of simultaneously signaling the opening of the first control valve 2 further comprises:
and detecting a second pipe wall temperature and a second pipe wall pressure at a third detection position (corresponding to the position of the third detection device 11) which is located at the downstream of the second detection position and close to the tail end of the first conveying pipe 1, and when the second pipe wall temperature and the second pipe wall pressure reach a third preset condition, sending a signal that the first control valve 2 is opened to the maximum opening at a constant speed or a non-constant speed within fourth preset time by the controller 8.
The third preset condition may be that the temperature of the second pipe wall reaches a third preset temperature, and the pressure of the second pipe wall reaches a third preset pressure. The specific values of the third preset temperature and the third preset pressure can be flexibly set according to the actual conditions.
Through detecting the pipe wall state of neighbouring first conveyer pipe 1 end, controller 8 can judge "warm pipe" process, judges whether whole first conveyer pipe 1 has all realized preliminary warm pipe, and then judges whether to adjust the aperture of first control valve 2 to the biggest.
In some embodiments, the operation of simultaneously signaling the opening of the first control valve 2 further comprises:
after the first control valve 2 is opened to the maximum opening, when the second pipe wall temperature and the second pipe wall pressure reach a fourth preset condition, the controller 8 sends a signal for reducing the opening of the first control valve 2 to a third proportion of the total opening.
By the arrangement, when the second pipe wall temperature and the second pipe wall pressure reach a fourth preset condition, the first conveying pipe 1 can be protected by properly reducing the opening degree of the first control valve 2, and damage caused by too high pipe wall temperature and pipe wall pressure of the first conveying pipe 1 is prevented.
The third proportion may be 98%, 95%, etc.
The fourth preset condition may be that the temperature of the second pipe wall reaches a fourth preset temperature, and the pressure of the second pipe wall reaches a fourth preset pressure. The specific values of the fourth preset temperature and the fourth preset pressure can be flexibly set according to the actual conditions. The fourth preset temperature is higher than the third preset temperature, and the fourth preset pressure is higher than the third preset pressure.
In some embodiments, the delivery method further comprises:
after the fifth preset time, the controller 8 sends a signal for closing the first control valve 2 at a constant speed or a non-constant speed within the sixth preset time;
after closing the first control valve 2, the controller 8 sends a signal to open the second control valve 5;
after a seventh preset time, the controller 8 signals the second control valve 5 to close.
When the conveying is stopped, the controller 8 controls the first control valve 2 to be slowly closed, so that the rapid temperature drop of the pipe wall caused by the sudden stop of the steam is avoided; meanwhile, after the first control valve 2 is closed, the second control valve 5 is opened for a period of time, so that condensed water generated in the first conveying pipe 1 can be discharged, and the condensed water is prevented from remaining in the pipeline.
Specific numerical values of the first preset time, the second preset time, the third preset time, the fourth preset time, the fifth preset time, the sixth preset time and the seventh preset time can be freely selected according to actual conditions, and each specific numerical value can be the same or different. In addition, the specific value of each preset time can be changed according to different seasons.
The operation of one embodiment of the steam delivery device and method of the present invention is described as follows:
the flow of starting the conveying is as follows:
after the boiler is started, the controller 8 starts to work, and the heating pipe program is started;
when the first detection device 9 detects that the steam temperature at the first detection position is higher than 150 ℃ and the steam pressure is higher than 0.4Mpa, the steam starts to exist in the first conveying pipe 1, the controller 8 sends out a control command, the second control valve 5 is opened to discharge condensed water, and the second control valve 5 is closed after 2 minutes;
after the second control valve 5 is closed, the controller 8 sends out a control command, the first control valve 2 is slowly opened to 5% of the total opening degree within 2 minutes, and steam enters the rear end of the valve through the first control valve 2 to perform pipe warming;
when the second detection device 10 detects that the temperature of the first pipe wall at the second detection position is more than 150 ℃ and the pressure of the first pipe wall is more than 0.4Mpa, the controller 8 sends a control command, the first control valve 2 is slowly opened to 10% of opening, and the through flow of the steam is increased;
when the third detection device 11 detects that the temperature of the second pipe wall at the third detection position is higher than 150 ℃ and the pressure of the second pipe wall is higher than 0.4Mpa, the controller 8 sends a control command, the first control valve 2 is opened to the full-open position at a constant speed within 15 minutes, and the through flow of the steam is continuously increased until the required delivery capacity of the steam is reached.
In the winter mode, the time during which the first control valve 2 is opened to the maximum opening degree may be longer than in the summer mode.
During the conveying process, after the third detection device 11 detects that the temperature of the second pipeline at the third detection position reaches the rated temperature and the pressure of the second pipeline reaches the rated pressure, the controller 8 sends out a control command, and the opening degree of the first control valve 2 is reduced to 95% of the total opening degree, so as to protect the first control valve 2.
When the conveying is stopped, the controller 8 sends out a control command, firstly, the first control valve 2 is slowly closed at a constant speed, the duration time is set to be 1 minute, after the first control valve 2 is closed, the second control valve 5 is slowly opened, and after 5 minutes of water drainage, the second control valve 5 is closed.
Through the description of the multiple embodiments of the steam conveying device and the steam conveying method, the steam conveying device and the steam conveying method can accurately execute pipe heating and water draining operations through the controller, reduce the operation intensity of operators, protect the conveying pipeline, effectively prevent water hammer, protect the conveying pipeline, and contribute to prolonging the service life of equipment and improving the safety and stability of a conveying system.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.
Claims (14)
1. A vapor delivery system, comprising:
a first delivery duct (1) for delivering steam;
the first control valve (2) is arranged on the first conveying pipe (1) and is used for adjusting the flow of the first conveying pipe (1);
a second delivery pipe (4) communicating with the first delivery pipe (1) for delivering condensed water produced in the first delivery pipe (1);
the second control valve (5) is arranged on the second conveying pipe (4) and is used for adjusting the flow of the second conveying pipe (4); and
and the controller (8) is in signal connection with the first control valve (2) and the second control valve (5) to control the opening degrees of the first control valve (2) and the second control valve (5).
2. The steam delivery system according to claim 1, further comprising a third delivery pipe (6) and a trap (7), the third delivery pipe (6) communicating with the first delivery pipe (1), the trap (7) being provided on the third delivery pipe (6).
3. A steam delivery system according to claim 2, further comprising a fourth delivery duct (3), the fourth delivery duct (3) communicating with the first delivery duct (1), the second delivery duct (4) and the third delivery duct (6) both communicating with the fourth delivery duct (3).
4. The steam delivery system according to claim 1, further comprising a detection device in signal connection with the controller (8), wherein the detection device is used for detecting the steam temperature and the steam pressure in the first delivery pipe (1) and the pipe wall temperature and the pipe wall pressure of the first delivery pipe (1), and the controller (8) controls the opening degree of the first control valve (2) and the second control valve (5) according to the detection result of the detection device.
5. A steam delivery system according to claim 4, wherein the detection means comprise first detection means (9) arranged upstream of the first control valve (2) for detecting the steam temperature and the steam pressure within the first delivery pipe (1).
6. A steam delivery system according to claim 5, wherein the detection means further comprise second detection means (10) arranged downstream of the first control valve (2) for detecting the temperature and pressure of the wall of the first delivery pipe (1).
7. A steam delivery system according to claim 6, wherein the detection means further comprise third detection means (11) arranged downstream of the second detection means (10) and adjacent to the end of the first delivery pipe (1) for detecting the temperature and pressure of the wall of the first delivery pipe (1).
8. A vapor delivery method, comprising:
signal-connecting a first control valve (2) and a second control valve (5) to a controller (8), the first control valve (2) being disposed on a first delivery pipe (1) for delivering steam, the second control valve (5) being disposed on a second delivery pipe (4) for delivering condensed water produced in the first delivery pipe (1), the second delivery pipe (4) being in communication with the first delivery pipe (1);
-the controller (8) sends a signal that causes the second control valve (5) to open;
after a first preset time, the controller (8) sends out a signal for closing the second control valve (5) and simultaneously sends out a signal for opening the first control valve (2).
9. The vapor delivery method according to claim 8, further comprising, before the controller (8) signals the second control valve (5) to open:
detecting the steam temperature and the steam pressure in the pipeline at a first detection position upstream of the first control valve (2);
the operation of the controller (8) to signal the opening of the second control valve (5) comprises:
when the steam temperature and the steam pressure reach a first preset condition, the controller (8) sends out a signal for opening the second control valve (5).
10. The steam delivery method according to claim 8, characterized in that the operation of simultaneously signaling the opening of the first control valve (2) comprises:
and simultaneously sending a signal which enables the first control valve (2) to be opened to a first proportion of the total opening at a constant speed or a non-constant speed within a second preset time.
11. The steam delivery method according to claim 10, wherein the operation of simultaneously signaling the opening of the first control valve (2) further comprises:
and detecting a first pipe wall temperature and a first pipe wall pressure at a second detection position on the downstream of the first control valve (2), and when the first pipe wall temperature and the first pipe wall pressure reach a second preset condition, sending a signal of a second proportion by the controller (8) to enable the first control valve (2) to be opened to a total opening at a constant speed or at a non-constant speed within a third preset time, wherein the second proportion is greater than the first proportion.
12. The steam delivery method according to claim 11, wherein the operation of simultaneously signaling the opening of the first control valve (2) further comprises:
and detecting a second pipe wall temperature and a second pipe wall pressure at a third detection position which is located at the downstream of the second detection position and is adjacent to the tail end of the first conveying pipe (1), and when the second pipe wall temperature and the second pipe wall pressure reach a third preset condition, the controller (8) sends a signal that the first control valve (2) is opened to the maximum opening at a constant speed or a non-constant speed within fourth preset time.
13. The steam delivery method according to claim 12, wherein the operation of simultaneously signaling the opening of the first control valve (2) further comprises:
after the first control valve (2) is opened to the maximum opening, when the temperature of the second pipe wall and the pressure of the second pipe wall reach a fourth preset condition, the controller (8) sends a signal for reducing a third proportion from the opening of the first control valve (2) to the total opening.
14. The vapor delivery method of claim 8, further comprising:
after the fifth preset time, the controller (8) sends out a signal which enables the first control valve (2) to be closed at a constant speed or a non-constant speed within the sixth preset time;
after closing the first control valve (2), the controller (8) sends a signal to open the second control valve (5);
after a seventh preset time, the controller (8) sends a signal to close the second control valve (5).
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