CN110615287A - Air leakage detection method of ash discharge valve and ash discharge system - Google Patents
Air leakage detection method of ash discharge valve and ash discharge system Download PDFInfo
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- CN110615287A CN110615287A CN201910892329.6A CN201910892329A CN110615287A CN 110615287 A CN110615287 A CN 110615287A CN 201910892329 A CN201910892329 A CN 201910892329A CN 110615287 A CN110615287 A CN 110615287A
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- valve
- air
- ash discharge
- valve core
- pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/36—Arrangements of containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/46—Gates or sluices, e.g. rotary wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/66—Use of indicator or control devices, e.g. for controlling gas pressure, for controlling proportions of material and gas, for indicating or preventing jamming of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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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
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
- F16K7/14—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm arranged to be deformed against a flat seat
Abstract
The application discloses an air leakage detection method of an ash discharging valve, which comprises the following steps of S1, judging whether a valve core of the ash discharging valve is in a closed position, if not, executing S2, and if so, executing S3; s2, closing the valve core, introducing high-pressure gas into a closed cavity formed by matching the valve core with a valve seat of the ash discharge valve, and continuing for a period of time to execute S4; s3, introducing high-pressure gas into a closed cavity formed by matching the valve core with the valve seat of the ash discharge valve, and continuing for a period of time to execute S4; and S4, stopping introducing high-pressure air into the closed cavity, detecting the air pressure P of the closed cavity, judging whether the P is reduced within the preset time t, and if so, judging that the ash discharge valve leaks air. When the valve core is closed, high-pressure gas is introduced into the closed cavity formed by matching the valve core with the valve seat of the ash discharging valve, whether P is reduced or not is judged, the air leakage state of the ash discharging valve is monitored, and then the ash discharging valve is overhauled in time when air leakage occurs, so that the overall energy consumption and the operation environment of sintered pellets are improved. The application also discloses an ash discharge system.
Description
Technical Field
The application relates to the technical field of metallurgical sintering, in particular to an air leakage detection method of an ash discharge valve, and also relates to an ash discharge system.
Background
In the metallurgical steel industry, a large amount of materials are discharged, wherein in most cases, a certain pressure difference exists between the space of a material bin and the space where the materials are discharged, and the process of crossing different pressure areas when the materials are discharged is called the process of crossing the pressure difference and discharging the materials. In the sintered pellet process, for example, a large amount of dust is generated in the production system, and a large amount of process equipment is required to collect the dust and concentrate the dust to discharge, and the dust are discharged in different pressure areas.
The ash discharge valve is widely applied to the procedures of a large flue of a sintering machine, an air box of a traditional circular cooler, an air box of a chain grate machine, a dust removal system and the like so as to ensure that the whole process of cross-pressure difference material discharge is carried out in a closed state. The existing most of the cinder valves adopt mushroom head type double-layer cinder valves which adopt rigid sealing, are easy to wear, have poor sealing effect and are easy to leak air.
In order to enhance the air tightness of the ash discharging valve, the ash discharging valve adopts a bowl-shaped valve core, two layers of sealing convex edges are arranged on the edge of the bowl-shaped valve core in a split manner and can be respectively in sealing contact with two ends of a valve seat, and solid material flow and air sealing are simultaneously cut off. However, the bowl-shaped valve core is easy to deposit particles, the phenomenon that the valve core is blocked by the particles exists with a high probability, complete sealing cannot be guaranteed once the valve core is blocked by the particles, high-speed airflow can be generated at gaps, and the valve core is eroded by carrying micro particles, so that abrasion is increased.
In the field of sintered pellets, if air leaks from an ash discharge valve, when equipment is under the action of an exhaust fan, a hopper of the ash discharge valve is in negative pressure, environmental gas flows into the double-layer ash discharge valve, ineffective air is increased, the load of the exhaust fan is increased, and energy is wasted; when the equipment is under the effect of air-blower, dust gas can leak to the environment through the dust discharge valve in the hopper, causes the dust pollution of dust in the external environment of dust discharge valve department.
In summary, how to monitor the air leakage state of the cindervalve to timely overhaul the cindervalve during air leakage, thereby improving the overall energy consumption and the working environment of the sintered pellets, is a technical problem to be solved by those skilled in the art.
Content of application
In view of this, an object of the present application is to disclose an air leakage detection method for an ash discharge valve, so as to monitor the air leakage state of the ash discharge valve, and then timely overhaul the ash discharge valve during air leakage, thereby improving the overall energy consumption and the operating environment of sintered pellets.
It is another object of the present application to disclose an ash discharge system.
In order to achieve the above purpose, the present application discloses the following technical solutions:
a method for detecting air leakage of an ash discharge valve comprises the following steps:
s1, judging whether a valve core of the ash discharging valve is in a closed position, if not, executing S2, and if so, executing S3;
s2, closing the valve core, introducing high-pressure gas into a closed cavity formed by matching the valve core with a valve seat of the ash discharge valve, and continuing for a period of time to execute S4;
s3, introducing high-pressure gas into a closed cavity formed by matching the valve core with the valve seat of the ash discharge valve, and continuing for a period of time to execute S4;
and S4, stopping introducing high-pressure air into the closed cavity, detecting the air pressure P of the closed cavity, judging whether the P is reduced within a preset time t, and if so, judging that the ash discharging valve leaks air.
Preferably, in the above air leakage detection method, the step S4 further executes S5: if P becomes smaller within the preset time t, opening the valve core, and executing S2;
the step S2 further includes:
recording the closing times n of the valve core as n +1, and recording the initial value n as 0; judging whether n reaches a preset number of times, if not, executing S4, and if so, executing S6;
s6, calculating the change rate K of P in the preset time t ═ P1-P1')/t; when 0 < K < mJudging that the local abrasion of the ash discharge valve leaks air; when K is larger than or equal to m, judging that the ash discharge valve is seriously damaged and leaks air;
wherein, P1 is the air pressure of the closed cavity when the high-pressure air blowing structure stops introducing high-pressure air; p1' is the air pressure of the closed cavity after the high-pressure air is stopped to be introduced for a preset time t.
Preferably, in the air leakage detection method, the preset number of times is 3.
According to the technical scheme, the air leakage detection method of the cinder valve comprises the following steps: s1, judging whether a valve core of the ash discharging valve is in a closed position, if not, executing S2, and if so, executing S3; s2, closing the valve core, introducing high-pressure gas into a closed cavity formed by matching the valve core with a valve seat of the ash discharge valve, and continuing for a period of time to execute S4; s3, introducing high-pressure gas into a closed cavity formed by matching the valve core with the valve seat of the ash discharge valve, and continuing for a period of time to execute S4; and S4, stopping introducing high-pressure air into the closed cavity, detecting the air pressure P of the closed cavity, judging whether the P is reduced within the preset time t, and if so, judging that the ash discharge valve leaks air.
According to the air leakage detection method of the ash discharging valve, when the valve core is closed, high-pressure air is introduced into a closed cavity formed by matching the valve core and a valve seat of the ash discharging valve, the introduction of the high-pressure air into the closed cavity is stopped after a period of time is continued, the air pressure P of the closed cavity is detected, whether P is reduced within a preset time t is judged, and if yes, air leakage of the ash discharging valve is judged; therefore, the air leakage state of the ash discharge valve is monitored, the ash discharge valve is overhauled in time when air leakage occurs, and the overall energy consumption and the operation environment of the sintered pellets are improved.
The application also discloses unloading system, including the unloading valve, with the ash bucket that the upper strata of unloading valve advances grey mouthful and connects, the unloading valve includes:
the edge of the valve core is provided with an upper sealing convex edge and a lower sealing convex edge in a forking manner;
the valve seat is provided with an upper sealing part and a lower sealing part, when the valve core is closed, the upper sealing convex edge is in sealing contact with the upper sealing part, and meanwhile, the lower sealing convex edge is in sealing contact with the lower sealing part and can be matched with the inner wall of the valve seat to form a closed cavity;
a driving structure for driving the valve core to open and close;
the ash discharge system further comprises:
the high-pressure air purging structure is used for introducing high-pressure air into the closed cavity in the closing process of the valve core and in a period of time after the valve core is closed;
the pressure sensor is used for detecting the air pressure P of the closed cavity;
and the processor judges whether P is reduced within preset time t or not after the high-pressure air blowing structure stops introducing high-pressure air into the closed cavity, and if yes, the air leakage of the ash discharge valve is judged.
Preferably, in the above ash discharge system, after the number of times of closing the valve element reaches a preset number of times, the processor calculates a rate of change K of P within a preset time t (P ═ P)1-P1')/t; when K is more than 0 and less than m, judging that the local abrasion of the ash discharge valve leaks air; when K is larger than or equal to m, judging that the ash discharge valve is seriously damaged and leaks air;
wherein, P1 is the air pressure of the closed cavity when the high-pressure air blowing structure stops introducing high-pressure air; p1' is the air pressure of the closed cavity after the high-pressure air is stopped to be introduced for a preset time t.
Preferably, in the above ash discharge system, the valve core is arc-shaped.
Preferably, in the above ash discharge system, the upper sealing flange extends upward from inside to outside, and the lower sealing flange extends downward from inside to outside to below the valve seat.
Preferably, in the above dust discharge system, the upper sealing portion and the lower sealing portion are both made of sealing rubber provided on the base.
Preferably, in the above ash discharge system, the ash discharge valve further includes an elastic material partition plate disposed on the valve seat, and the elastic material partition plate blocks one side of the sealing fit position of the upper sealing portion and the upper sealing flange, which is close to the upper layer ash inlet.
Preferably, in the above ash discharge system, the number of the valve cores is two, and the two valve cores are arranged up and down.
According to the technical scheme, the ash discharging system comprises an ash discharging valve and an ash hopper connected with an upper-layer ash inlet of the ash discharging valve, wherein the ash discharging valve comprises a valve core, and the edge of the valve core is provided with an upper sealing convex edge and a lower sealing convex edge in a split manner; the valve seat is provided with an upper sealing part and a lower sealing part, when the valve core is closed, the upper sealing convex edge is in sealing contact with the upper sealing part, and meanwhile, the lower sealing convex edge is in sealing contact with the lower sealing part and can be matched with the inner wall of the valve seat to form a closed cavity; and a driving structure for driving the valve core to open and close.
The ash discharge system further comprises: the high-pressure air purging structure is used for introducing high-pressure air into the closed cavity in the closing process of the valve core and in a period of time after the valve core is closed; the pressure sensor is used for detecting the air pressure P of the closed cavity; and the processor detects the high-pressure air blowing structure after stopping introducing the high-pressure air into the closed cavity, judges whether the P is reduced within the preset time t, and judges that the ash discharge valve leaks air if the P is reduced within the preset time t.
When the ash unloading system detects air leakage of the ash unloading valve, the valve core is closed by using the driving structure, high-pressure air is introduced into a closed cavity formed by matching the valve core and a valve seat of the ash unloading valve through the high-pressure air blowing structure, the introduction of the high-pressure air into the closed cavity is stopped after a period of time, the air pressure P of the closed cavity is detected by using the pressure sensor, whether P is reduced within a preset time t is judged by using the processor, and if yes, air leakage of the ash unloading valve is judged; therefore, the air leakage state of the ash discharge valve is monitored, the ash discharge valve is overhauled in time when air leakage occurs, and the overall energy consumption and the operation environment of the sintered pellets are improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for detecting air leakage of an ash discharge valve disclosed in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of an ash discharge system disclosed in an embodiment of the present application;
FIG. 3 is a partial cross-sectional view of an ash discharge system as disclosed in an embodiment of the present application;
fig. 4 is a partially enlarged structural view of a in fig. 3.
Detailed Description
The embodiment of the application discloses an air leakage detection method of an ash discharge valve, which realizes monitoring of the air leakage state of the ash discharge valve, and then timely overhauling of the ash discharge valve during air leakage, thereby improving the overall energy consumption and the operation environment of sintered pellets.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the method for detecting air leakage of an ash discharge valve disclosed in the embodiment of the present application includes the steps of:
s1, judging whether a valve core 8 of the ash discharging valve is in a closed position, if not, executing S2, and if so, executing S3;
s2, closing the valve core 8, introducing high-pressure gas into a closed cavity formed by matching the valve core 8 with the valve seat 12 of the ash discharge valve, and continuing for a period of time to execute S4;
specifically, high-pressure gas is introduced through a high-pressure gas pipeline.
S3, introducing high-pressure gas into a closed cavity formed by matching the valve core 8 with the valve seat 12 of the ash discharge valve, and continuing for a period of time to execute S4;
and S4, stopping introducing high-pressure air into the closed cavity, detecting the air pressure P of the closed cavity, judging whether the P is reduced within the preset time t, and if so, judging that the ash discharge valve leaks air.
According to the air leakage detection method of the ash discharging valve, when the valve core 8 is closed, high-pressure air is introduced into a closed cavity formed by matching the valve core 8 and the valve seat 12 of the ash discharging valve, the introduction of the high-pressure air into the closed cavity is stopped after a period of time is continued, the air pressure P of the closed cavity is detected, whether P is reduced within a preset time t is judged, and if yes, air leakage of the ash discharging valve is judged; therefore, the air leakage state of the ash discharge valve is monitored, the ash discharge valve is overhauled in time when air leakage occurs, and the overall energy consumption and the operation environment of the sintered pellets are improved.
After the air leakage condition of the ash discharging valve is detected, whether the discharging requirement is met or not is judged through the material level sensor 2 on the ash bucket 1, and discharging operation is executed.
Preferably, in the above air leakage detection method, the step S4 further executes S5: if P becomes smaller within the preset time t, the valve core 8 is opened, and S2 is executed;
step S2 further includes: recording the closing times n of the valve core 8 to be n +1, and recording the initial value n to be 0; judging whether n reaches a preset number of times, if not, executing S4, and if so, executing S6;
s6, calculating the change rate K of P in the preset time t ═ P1-P1')/t; when K is more than 0 and less than m, judging that the local abrasion of the ash discharge valve leaks air; when K is larger than or equal to m, judging that the ash discharging valve is seriously damaged and leaks air;
wherein, P1 is the air pressure of the sealed cavity when the high-pressure air blowing structure 15 stops introducing high-pressure air; p1' is the air pressure of the closed cavity after the high-pressure air is stopped to be introduced for a preset time t.
When the P value becomes small, the valve core 8 is opened and closed once again, and the problem that the valve core 8 is blocked by particles and is not sealed tightly can be avoided.
When the occurrence frequency of the condition that P is reduced reaches a preset frequency, the air leakage condition of the ash discharge valve is divided into two conditions by calculating the change rate of P in a preset time t, wherein one condition is that the local abrasion of the ash discharge valve leaks air, the air leakage warning is output, and a maintenance plan is suggested to be made; the other is that the ash discharging valve is seriously damaged and leaks air, an air leakage alarm is output, and the machine needs to be stopped for maintenance immediately; thereby reducing maintenance times.
And m is the change rate of P in t when the wind leaks to a smaller extent and can meet the normal use requirement.
Of course, the application may not include S6, and the ash discharge valve is maintained as long as P is reduced within the preset time t.
Preferably, the preset number of times is 3. After the valve core 8 is closed 3 times, namely after P becomes smaller and reaches 3 times, the change rate K of P in the preset time t is calculated to be (P)1-P1')/t; the condition of air leakage caused by the blocking fault of the particles is eliminated.
After 3 and above actions are executed like this, the P value still becomes smaller and then the valve core 8 abrasion or the aging and abrasion of the sealing rubber corresponding to the valve core 8 can be judged, the staff can arrange the maintenance plan according to the P value reduction rate, when the P value reduction rate reaches the m value, the control system configured by the dust discharge valve equipment can prompt the sealing fault and prompt the staff to immediately maintain and replace.
Of course, the preset number of times may be 2 or 4, etc.
The embodiment of the application also discloses an ash discharging system, which comprises an ash discharging valve and an ash bucket 1 connected with the upper ash inlet of the ash discharging valve, wherein the ash discharging valve comprises a valve core 8, and the edge of the valve core 8 is provided with an upper sealing convex edge 81 and a lower sealing convex edge 82 in a split manner; the valve seat 12, the valve seat 12 is provided with an upper sealing portion 14 and a lower sealing portion 16, when the valve core 8 is closed, the upper sealing flange 81 is in sealing contact with the upper sealing portion 14, and simultaneously, the lower sealing flange 82 is in sealing contact with the lower sealing portion 16, and can be matched with the inner wall of the valve seat 12 to form a closed cavity; and a driving structure for driving the valve element 8 to open and close.
The ash discharge system further comprises: the high-pressure air blowing structure 15 is used for introducing high-pressure air into the closed cavity by the high-pressure air blowing structure 15 in the closing process of the valve core 8 and in a period of time after the valve core is closed; a pressure sensor 11 for detecting the air pressure P of the closed cavity; and the processor and the high-pressure air blowing structure 15 detect after stopping introducing high-pressure air into the closed cavity, and judge whether the P is reduced within the preset time t or not by the processor, and if so, judge that the ash discharge valve leaks air.
When the ash unloading system detects air leakage of the ash unloading valve, the valve core 8 is closed by using the driving structure, high-pressure air is introduced into a closed cavity formed by matching the valve core 8 and a valve seat 12 of the ash unloading valve through the high-pressure air blowing structure 15, the high-pressure air is stopped being introduced into the closed cavity after a period of time, the air pressure P of the closed cavity is detected by using the pressure sensor 11, whether P is reduced within preset time t is judged by using the processor, and if yes, air leakage of the ash unloading valve is judged; therefore, the air leakage state of the ash discharge valve is monitored, the ash discharge valve is overhauled in time when air leakage occurs, and the overall energy consumption and the operation environment of the sintered pellets are improved.
After the air leakage condition of the ash discharging valve is detected, whether the discharging requirement is met or not is judged through the material level sensor 2 on the ash bucket 1, and discharging operation is executed.
Specifically, a transition pipe 3 is arranged at an upper-layer ash inlet of the ash discharge valve and is used for being in transition connection with an ash bucket 1. The pressure sensor 11 is provided on the valve seat 12, but may be provided on the valve element 8.
The valve core 8 is connected to a rotating shaft 10 through a connecting rod 9. The driving structure comprises a driving motor 7, the driving motor 7 swings back and forth through a driving crank 4 to drive a rotating shaft 10 to rotate, and the rotating shaft 10 further drives a valve core 8 to turn over through a connecting rod 9 to realize opening and closing. Of course, the above driving structure may adopt another structure capable of driving the valve element 8 to close.
The valve core 8 is divided into an upper sealing flange 81 and a lower sealing flange 82, and the sealing flange 82 contacts with a corresponding sealing portion on the valve seat 12 to realize sealing in the closed state. The high-pressure air blowing structure 15 is filled with high-pressure air through a high-pressure air pipeline, and a plurality of vent holes for filling the high-pressure air are formed in the circumferential direction of the valve seat 12.
Preferably, in the above ash discharge system, after the number of times of closing the valve element 8 reaches a preset number of times, the processor calculates a rate of change K of P within a preset time t (P ═ P)1-P1')/t; when K is more than 0 and less than m, judging that the local abrasion of the ash discharge valve leaks air; when K is larger than or equal to m, judging that the ash discharging valve is seriously damaged and leaks air;
wherein, P1 is the air pressure of the sealed cavity when the high-pressure air blowing structure 15 stops introducing high-pressure air; p1' is the air pressure of the closed cavity after the high-pressure air is stopped to be introduced for a preset time t.
When the P value becomes small, the valve core 8 is opened and closed once again, and the problem that the valve core 8 is blocked by particles and is not sealed tightly can be avoided.
When the occurrence frequency of the condition that P is reduced reaches a preset frequency, the air leakage condition of the ash discharge valve is divided into two conditions by calculating the change rate of P in a preset time t, wherein one condition is that the local abrasion of the ash discharge valve leaks air, the air leakage warning is output, and a maintenance plan is suggested to be made; the other is that the ash discharging valve is seriously damaged and leaks air, an air leakage alarm is output, and the machine needs to be stopped for maintenance immediately; thereby reducing maintenance times.
And m is the change rate of P in t when the wind leaks to a smaller extent and can meet the normal use requirement.
Of course, the change rate K can be not calculated, and the ash discharge valve is maintained as long as P is reduced within the preset time t.
Preferably, the preset number of times is 3. After the valve core 8 is closed 3 times, namely after P becomes smaller and reaches 3 times, the change rate K of P in the preset time t is calculated to be (P)1-P1')/t; the condition of air leakage caused by the blocking fault of the particles is eliminated.
After 3 and above actions are executed like this, the P value still becomes smaller and then the valve core 8 abrasion or the aging and abrasion of the sealing rubber corresponding to the valve core 8 can be judged, the staff can arrange the maintenance plan according to the P value reduction rate, when the P value reduction rate reaches the m value, the control system configured by the dust discharge valve equipment can prompt the sealing fault and prompt the staff to immediately maintain and replace.
Of course, the preset number of times may be 2 or 4, etc.
Preferably, the valve core 8 is arc-shaped, so that particles are not easy to deposit. The valve element 8 may be recessed downward or may be raised upward.
Further, the upper sealing flange 81 extends upward from inside to outside, and the lower sealing flange 82 extends downward from inside to outside to below the valve seat 12. At the moment, the valve core 8 is in an X shape, and particles are difficult to deposit on the valve core 8 when materials flow through the valve core 8; when the valve core 8 is closed, the lower sealing convex edge 82 is abutted against the lower end face of the valve seat 12, so that a better sealing effect can be achieved.
Preferably, in the above-mentioned dust discharging system, the upper sealing portion 14 and the lower sealing portion 16 are both made of sealing rubber provided on the base. The sealing rubber is arranged on the valve seat 12, and is convenient to replace. The upper seal portion 14 and the lower seal portion 16 may have other structures that can achieve sealing.
Preferably, in the above-mentioned ash discharge system, the ash discharge valve further comprises an elastic material partition plate 13 disposed on the valve seat 12, and the elastic material partition plate 13 blocks one side of the sealing engagement between the upper sealing portion 14 and the upper sealing flange 81, which is close to the upper layer ash inlet.
The elastic material separating plate 13 can deform under stress; in the closing process of the valve core 8, the elastic material separating plate 13 is matched with the valve core 8 to separate large particles, most of materials are intercepted, and when the large particles are clamped between the elastic material separating plate 13 and the valve core 8, the material separating plate can deform along with the closing of the valve core 8, and the normal closing sealing of the valve core 8 is not influenced.
The ash discharging system is simple in structure and convenient to maintain.
In a specific embodiment, the number of the valve cores 8 is two, and the two valve cores are arranged up and down. The ash discharging valve is of a double-layer structure, when the discharging requirement is met, the upper valve 5 is opened first, then the lower valve 6 is opened and closed, and the air leakage condition is detected by adopting the detection mode respectively.
The ash discharging valve is of a double-layer structure, and X-shaped valve cores 8 are arranged in the upper valve 5 and the lower valve 6.
The concrete working process of the ash unloading system is as follows:
the particle materials are stacked in an ash bucket 1, a material level sensor 2 is arranged on the ash bucket 1, and the material level sensor 2 can be a radar material level meter, a thermocouple material level meter, a radio frequency admittance material level meter, a rotation-resistance type material level meter and the like.
When the materials are accumulated to a certain height, the material level sensor senses and triggers the upper valve 5 to open the valve core 8, and the materials fall into the cavity of the upper valve 5; after the discharge, the valve core 8 is driven to be closed through the driving motor 7, in the closing process, the high-pressure gas pipeline starts to ventilate to purge the interior of the valve seat 12, when the valve core 8 is close to a closed state, high-pressure gas can form a gas wall on the valve core 8 outside the sealing convex edge 81 and the lower sealing convex edge 82 to block small particles from entering, so that the valve core 8 can be completely prevented from being blocked by the particles, and the valve core 8 is protected from being sealed with the sealing rubber in normal contact.
After the valve core 8 of the upper valve 5 is closed, the valve core 8 of the lower valve 6 is opened, the material is discharged according to the mode of the upper valve 5, and the valve core 8 of the lower valve 6 is closed.
When special conditions exist in the operation process, namely a large-particle blocking valve core 8 exists, the valve core 8 is not closed tightly or the valve core 8 is worn seriously after being used for exceeding the service life, and the sealing performance of the valve core 8 is not tight under the conditions of aging, abrasion and the like of sealing rubber corresponding to the valve core 8, the pressure P measured by the pressure sensor 11 can be monitored at the moment. The pressure P of a high-pressure gas pipeline is known to be the pressure of an industrial gas source through a source detection device, the pressure is generally 2-4Mpa, the measured pressure P1 is equal to P when a valve core 8 is in a closed state, the relative pressure difference of the working environment of a double-layer ash discharge valve is generally 13-20kPa, the pressure in the space in the ash discharge valve is far lower than P1, if the valve core 8 is not tightly sealed, the gas in the space between the valve core 8 and a valve seat 12 can leak, the pressure P1 can be sharply reduced at the moment, and if the sealing is not problematic, the P1 can be kept unchanged. The sealing condition of the valve core 8 can be judged by monitoring the descending speed of the P1 value, if the descending speed of the P1 value is slow, a small gap exists in the valve core 8, and if the descending speed of the P1 value is fast, a large gap exists in the valve core 8.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for detecting air leakage of an ash discharge valve is characterized by comprising the following steps:
s1, judging whether a valve core (8) of the ash discharging valve is in a closed position, if not, executing S2, and if so, executing S3;
s2, closing the valve core (8), introducing high-pressure gas into a closed cavity formed by matching the valve core (8) with the valve seat (12) of the ash discharge valve, and continuing for a period of time to execute S4;
s3, introducing high-pressure gas into a closed cavity formed by matching the valve core (8) with the valve seat (12) of the ash discharge valve, and continuing for a period of time to execute S4;
and S4, stopping introducing high-pressure air into the closed cavity, detecting the air pressure P of the closed cavity, judging whether the P is reduced within a preset time t, and if so, judging that the ash discharging valve leaks air.
2. The method of claim 1, wherein the step S4 further performs S5: if P is reduced within the preset time t, opening the valve core (8) and executing S2;
the step S2 further includes:
recording the closing times n of the valve core (8) as n +1, and recording the initial value n as 0; judging whether n reaches a preset number of times, if not, executing S4, and if so, executing S6;
s6, calculating the change rate K of P in the preset time t ═ P1-P1')/t; when K is more than 0 and less than m, judging that the local abrasion of the ash discharge valve leaks air; when K is larger than or equal to m, judging that the ash discharge valve is seriously damaged and leaks air;
wherein P1 is the air pressure of the closed cavity when the high-pressure air blowing structure (15) stops introducing high-pressure air; p1' is the air pressure of the closed cavity after the high-pressure air is stopped to be introduced for a preset time t.
3. The method of claim 2, wherein the predetermined number of times is 3.
4. The utility model provides an unloading system, includes the unloading valve, with ash bucket (1) that the upper strata ash inlet of unloading valve is connected, its characterized in that, the unloading valve includes:
the valve core (8), the edge of the valve core (8) is provided with an upper sealing flange (81) and a lower sealing flange (82) in a split manner;
the valve seat (12) is provided with an upper sealing part (14) and a lower sealing part (16), when the valve core (8) is closed, the upper sealing flange (81) is in sealing contact with the upper sealing part (14), and meanwhile, the lower sealing flange (82) is in sealing contact with the lower sealing part (16) and can be matched with the inner wall of the valve seat (12) to form a closed cavity;
a driving structure for driving the valve core (8) to open and close;
the ash discharge system further comprises:
the high-pressure air purging structure (15) is used for introducing high-pressure air into the closed cavity in the closing process of the valve core (8) and in a period of time after the valve core is closed;
a pressure sensor (11) for detecting the air pressure P of the closed cavity;
and the high-pressure air blowing structure (15) stops introducing high-pressure air into the closed cavity, the processor judges whether P is reduced within preset time t, and if yes, the ash discharge valve is judged to leak air.
5. The ash discharge system of claim 4, wherein the processor calculates the change rate K-P (P) of P within a preset time t when the closing time of the valve core (8) reaches a preset time (P ═ P)1-P1')/t; when K is more than 0 and less than m, judging that the local abrasion of the ash discharge valve leaks air; when K is larger than or equal to m, judging that the ash discharge valve is seriously damaged and leaks air;
wherein P1 is the air pressure of the closed cavity when the high-pressure air blowing structure (15) stops introducing high-pressure air; p1' is the air pressure of the closed cavity after the high-pressure air is stopped to be introduced for a preset time t.
6. An ash discharge system according to claim 4, characterized in that the valve spool (8) is arc-shaped.
7. The ash discharge system of claim 6 wherein said upper sealing flange (81) extends upwardly from the inside to the outside and said lower sealing flange (82) extends downwardly from the inside to the outside below said valve seat (12).
8. The ash discharge system according to claim 4, wherein the upper sealing portion (14) and the lower sealing portion (16) are each a sealing rubber provided on the base.
9. The ash discharge system according to claim 8, wherein the ash discharge valve further comprises an elastic material partition plate (13) arranged on the valve seat (12), and the elastic material partition plate (13) blocks one side close to the upper layer ash inlet at the sealing engagement position of the upper sealing part (14) and the upper sealing convex edge (81).
10. An ash discharge system according to any one of claims 4-9, characterized in that the valve element (8) is two and arranged one above the other.
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| CN201910892329.6A CN110615287A (en) | 2019-09-20 | 2019-09-20 | Air leakage detection method of ash discharge valve and ash discharge system |
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| CN201910892329.6A CN110615287A (en) | 2019-09-20 | 2019-09-20 | Air leakage detection method of ash discharge valve and ash discharge system |
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Cited By (1)
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| CN112901785A (en) * | 2021-03-06 | 2021-06-04 | 福建省世阀智能科技有限公司 | Valve with built-in intelligent tightness detection system |
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Application publication date: 20191227 |