CN218818507U - Steam soot blowing regulating valve for pulverized coal fired boiler - Google Patents
Steam soot blowing regulating valve for pulverized coal fired boiler Download PDFInfo
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- CN218818507U CN218818507U CN202222993949.9U CN202222993949U CN218818507U CN 218818507 U CN218818507 U CN 218818507U CN 202222993949 U CN202222993949 U CN 202222993949U CN 218818507 U CN218818507 U CN 218818507U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model discloses a be used for pulverized coal boiler steam to blow grey governing valve belongs to automatic instrument control technical field, installs on pulverized coal boiler's steam line of steam soot blower, include: the pneumatic actuator is internally provided with a membrane chamber for containing gas; the upper end of the valve core assembly is fixedly connected with the pneumatic actuating mechanism so as to be driven by the pneumatic actuating mechanism to move up and down; the air inlet end of the pneumatic positioner is communicated with an air source through a first pipeline, the air delivery end of the pneumatic positioner is communicated with the membrane chamber through a second pipeline, and the control end of the pneumatic positioner is used for receiving a valve opening degree instruction; and the pressure regulating mechanism is arranged on the second pipeline. The pressing plate is arranged above the spring, so that the pre-pressing force of the spring on the valve core through the push rod is enhanced, the pressure regulating mechanism is utilized to stabilize the regulating pressure, the valve is prevented from oscillating during regulation, and the gas leakage amount is reduced by grinding the valve core.
Description
Technical Field
The utility model belongs to the technical field of automatic instrument control, in particular to be used for pulverized coal fired boiler steam to blow grey governing valve.
Background
The modern pulverized coal boiler has large capacity and high load, needs to regularly blow soot, if the soot is blown irregularly, the medium heat exchange is insufficient and the energy is wasted, if the soot is blown irregularly, the boiler is blown out from the burst pipe, the heat exchange medium is lost, the boiler stops and cannot safely produce, and the steam turbine cannot generate electricity and the blast furnace fan driven by the steam turbine is stopped.
As a traditional soot blower, the pressure and the flow of steam flow need to be adjusted, a pneumatic actuating mechanism is mostly adopted, an output air source port of a positioner supplies air from the lower end cover of the actuating mechanism, and a valve is in a closed position when no air exists. After the regulating valve is used for 2 to 3 years, a plurality of problems occur, namely: fatigue aging conditions of different degrees occur in a plurality of springs in the executing mechanism, and the prepressing force of the springs on the valve core through the push rod after the springs in the executing mechanism are reset is insufficient, so that the leakage amount of the valve core is obviously larger and the adjusting pressure is unstable; secondly, the following steps: the material of the valve core is washed by high temperature, and the leakage amount is also increased. When the pressure behind the regulating valve exceeds a limit value, such as 4MPa, the opening action of the safety valve is caused, steam is released in vain, the soot blowing action cannot be realized, and even the pipe explosion of the heating surface of the boiler in the blowing process is caused, so that great danger exists. Thirdly, the method comprises the following steps: if the steam pressure reduced by the regulating valve is low or unstable, the soot blowing effect cannot be achieved, and soot blowing is repeated for many times, so that the blockage of the soot blowing gun cannot be removed, the burning is reduced, and the service life is shortened.
Therefore, the demand for developing a steam soot blowing regulating valve for a pulverized coal boiler is urgent.
SUMMERY OF THE UTILITY MODEL
In order to solve the unstable problem of soot blowing regulating valve pressure regulating among the foretell prior art at least, the utility model provides a following technical scheme: a steam soot-blowing regulating valve for a pulverized coal boiler, installed on a steam pipe of a steam soot blower of the pulverized coal boiler, the steam soot-blowing regulating valve comprising:
the pneumatic actuator is internally provided with a membrane chamber for containing gas;
the upper end of the valve core assembly is fixedly connected with the pneumatic actuating mechanism so as to be driven by the pneumatic actuating mechanism to move up and down;
the air inlet end of the pneumatic positioner is communicated with an air source through a first pipeline, the air conveying end of the pneumatic positioner is communicated with the membrane chamber through a second pipeline, and the control end of the pneumatic positioner is used for receiving a valve opening degree instruction;
and the pressure regulating mechanism is arranged on the second pipeline.
Preferably, the pneumatic actuator comprises: the pneumatic actuator comprises an upper end cover, a lower end cover and a pneumatic actuator assembly, wherein the lower end cover is arranged opposite to the upper end cover;
the upper end cover is connected with the lower end cover in a sealing manner, the inner cavities of the upper end cover and the lower end cover jointly form the membrane chamber, and the bottom of the lower end cover is provided with an air source interface communicated with the air conveying end of the second pipeline;
the pneumatic execution assembly is positioned in the membrane chamber and drives the valve core assembly to act through the flow direction of the gas.
Preferably, the pneumatic actuator assembly comprises: push rod, spring, diaphragm and tray;
the diaphragm is elastic and is fixedly positioned at the lower part of the diaphragm chamber, and a certain gap is formed between the diaphragm and the inner wall of the bottom of the lower end cover;
the tray is positioned above the membrane, and is in sliding connection with the side wall of the membrane chamber;
the push rod is vertically arranged, the push rod is fixedly connected with the center of the tray and the center of the diaphragm, and the lower end of the push rod penetrates through the lower end cover to be fixedly connected with the upper end of the valve core assembly;
the spring is located below the upper end cover, the spring sleeve is arranged on the outer side of the upper portion of the push rod, and the lower end of the spring is fixedly connected with the upper surface of the tray.
Preferably, the pneumatic actuating assembly further comprises ： Pressing a plate;
the pressing plate is located below the upper end cover and connected with the upper end of the spring, the pressing plate is connected with the side wall of the upper end cover in a sliding mode, and the shapes of the pressing plate and the tray are matched with the shape of the inner side wall of the film chamber.
Preferably, the inner diameters of the upper end cover and the lower end cover are the same, and the inner walls of the upper end cover and the lower end cover are both vertically and smoothly arranged.
Preferably, the valve core assembly comprises: a valve stem and a valve core;
the valve core is arranged in a positive mode, and one end of the valve core is connected with a valve seat in the valve in a sliding mode;
the upper end of the valve rod is fixedly connected with the lower end of the push rod, and the lower end of the valve rod is fixedly connected with the other end of the valve core.
Preferably, the pressure regulating mechanism includes: a quick discharge valve;
the quick discharge valve is connected to the second pipeline in series;
the quick exhaust valve is provided with an air inlet, an air conveying port and an air outlet, the air inlet is communicated with the air conveying end of the pneumatic positioner, and the air conveying port is communicated with the air source interface.
Preferably, the pressure regulating mechanism further comprises: a manual needle valve;
the manual needle valve and the quick-release valve are arranged in parallel and are arranged on the second pipeline, and the manual needle valve is used for adjusting the pressure difference on two sides of the quick-release valve.
Preferably, the control end of the pneumatic positioner is in signal connection with a remote PLC, and the pneumatic actuator is a single-action pneumatic actuator.
Preferably, the surface of the valve core is ground, and the output pressure of the steam soot blowing regulating valve is 0.8-1.8 MPa.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
the pneumatic positioner controls the pneumatic actuating mechanism to rapidly act by utilizing a gas signal, so that the pneumatic actuating mechanism is rapidly positioned, the valve is indirectly controlled to be opened or closed, particularly the closing speed is obviously accelerated, and meanwhile, the steam pressure at the outlet of the regulating valve is stable, so that the actual requirement of steam soot blowing is met;
through the pressure regulating mechanism, the gas pressure difference between the pneumatic actuating mechanism and the pneumatic positioner can be reduced, the regulating pressure is stabilized, and the oscillation of the valve during regulation is prevented;
a cover plate is additionally arranged at the upper part of the pneumatic actuating mechanism, such as a round iron plate, so that the spring is pre-compressed;
through grinding the adjusting valve core, the surface of the adjusting valve core which works for a long time is flattened by forming multi-point pits after being washed by a high-temperature medium, so that the binding surface of the adjusting valve core and the valve seat is increased, and the gas leakage amount is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a steam soot blowing control valve for a pulverized coal fired boiler according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of a pressure regulating mechanism in a steam soot-blowing regulating valve for a pulverized coal boiler according to an embodiment of the present invention;
in the figure: 1. a pneumatic positioner; 101. an air inlet end; 102. a gas delivery end; 2. a quick discharge valve; 3. an upper end cover; 4. a lower end cover; 5. a push rod; 6. a spring; 7. a membrane; 8. a tray; 9. an air source interface; 10. pressing a plate; 11. a valve stem; 12. a valve core; 13. a manual needle valve; 14. a control end; 15. a second conduit;
the position A on the second pipeline is communicated with an air inlet of the quick discharge valve;
the position B on the second pipeline is communicated with a gas transmission port of the quick discharge valve;
c represents the exhaust port of the quick exhaust valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In the description of the present invention, the directions or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are the directions or positional relationships shown on the basis of the drawings, and are only for convenience of description of the present invention, but not for the purpose of requiring the present invention to be constructed and operated in a specific direction, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a radio electrical connection, or a wireless communication signal connection, and a person of ordinary skill in the art may understand the specific meaning of the above terms according to specific situations.
Referring to fig. 1-2, the utility model provides a pulverized coal boiler steam blows grey governing valve installs on pulverized coal boiler's steam line of steam soot blower, and steam blows grey governing valve and includes: the pneumatic control valve comprises a pneumatic actuating mechanism, a valve core assembly, a pneumatic positioner 1 and a pressure regulating mechanism.
The pneumatic actuator has a diaphragm chamber therein for containing a gas. The pneumatic actuator is driven by gas for opening or closing, namely when the internal gas quantity is increased (namely, gas enters the membrane chamber), the pneumatic actuator performs opening action, and when the internal gas quantity is reduced (namely, gas leaves the membrane chamber), the pneumatic actuator performs closing action. It should be noted that the pneumatic actuators are classified into single-acting and double-acting pneumatic actuators. The single-acting pneumatic actuating mechanism is simple in structure, when the air source loses air or the control of the positioner fails, the danger is reduced to the minimum by means of the self-resetting action of the spring, and the double-acting pneumatic actuating mechanism is generally not easy to reset, so that the single-acting pneumatic actuating mechanism is mostly used under dangerous working conditions. The application adopts a straight-stroke single-action spring reset type pneumatic actuating mechanism.
The upper end of the valve core assembly is fixedly connected with the pneumatic actuating mechanism, preferably welded together, so that the valve core assembly can move up and down under the driving of the pneumatic actuating mechanism. When the pneumatic actuator executes opening action, the valve core assembly moves upwards to be away from the valve seat of the valve, so that the valve is opened, and when the pneumatic actuator executes closing action, the valve core assembly descends to fall back into the valve seat of the valve, so that the valve is closed.
The air inlet end 101 of the pneumatic positioner 1 is communicated with an air source through a first pipeline, the air delivery end 102 of the pneumatic positioner 1 is communicated with the membrane chamber through a second pipeline 15, that is, air enters the air inlet end 101 of the pneumatic positioner 1 through the first pipeline, then enters the second pipeline 15 from the air delivery end 102 of the pneumatic positioner 1, and finally reaches the membrane chamber. The control end 14 of the pneumatic positioner 1 is used for receiving a valve opening degree command. Further, the control end 14 of the pneumatic positioner 1 is in signal connection with a remote PLC, the control end 14 of the pneumatic positioner 1 receives an on/off analog quantity signal sent by the remote PLC through a 4-20mA control loop, the pneumatic positioner 1 responds quickly to open the gas transmission end 102 to transmit gas into the membrane chamber to control the start of the pneumatic actuator or close the gas transmission end 102 to stop transmitting gas into the membrane chamber to control the close of the pneumatic actuator, that is, the pneumatic positioner 1 controls the pneumatic actuator to act quickly by using a gas signal (gas flow direction), that is, only when the control end 14 of the pneumatic positioner 1 receives the on/off analog quantity signal sent by the remote PLC, the corresponding action of opening or closing the gas transmission end 102 is further executed.
The pressure regulating mechanism is arranged on a second pipeline 15 between the pneumatic actuating mechanism and the pneumatic positioner 1, and two ends of the pressure regulating mechanism are respectively communicated with the pneumatic actuating mechanism and the pneumatic positioner 1. Through the pressure regulating mechanism, the gas pressure difference between the gas source interface 9 of the pneumatic actuating mechanism and the gas transmission end 102 of the pneumatic positioner 1 can be reduced, the oscillation during valve regulation is prevented, and the pressure of steam is stabilized.
As shown in fig. 1, the pneumatic actuator includes: the pneumatic actuator comprises an upper end cover 3, a lower end cover 4 and a pneumatic actuator assembly, wherein the lower end cover 4 is arranged opposite to the upper end cover 3.
The upper end cover 3 and the lower end cover 4 are butted to form a complete shell, the outer walls of the upper end cover 3 and the lower end cover 4 are connected together through bolts, a sealing structure is arranged at the joint, or the upper end cover 3 and the lower end cover 4 can be welded together, the inner cavity of the shell is a membrane chamber for accommodating a pneumatic execution assembly and gas, a gas source interface 9 communicated with a gas transmission end of a second pipeline 15 is arranged at the bottom of the lower end cover, and the gas can enter and exit the membrane chamber through the gas source interface 9, so that conditions are created for the pneumatic execution mechanism to perform opening and closing actions. Specifically, pneumatic actuator assembly is located the inside of diaphragm chamber, reciprocates through gaseous flow direction drive valve core subassembly, and when outside gas got into the diaphragm chamber, pneumatic actuator assembly drove the direction motion of the ascending court of valve core subassembly of keeping away from the disk seat in the valve, and when inside gas outflow diaphragm chamber, pneumatic actuator assembly drove the disk seat in the valve is returned to the disk seat in the valve that the valve core subassembly descends.
Further, the pneumatic actuator assembly includes: push rod 5, spring 6, diaphragm 7 and tray 8.
Diaphragm 7 has certain elasticity, the fixed lower part that is located the diaphragm chamber, the lateral wall of diaphragm 7 and the lateral wall fixed connection of diaphragm chamber, diaphragm 7 and lower end cover 4's bottom inner wall have certain clearance, and like this, diaphragm 7 takes place deformation and can the up-and-down motion under receiving the gas pressure effect, and the gas that gets into from gas source interface 9 need get into the diaphragm chamber through the clearance between the bottom inner wall of diaphragm 7 and lower end cover 4, and lower diaphragm 7 can cover gas source interface 9 completely under normal condition. Tray 8 is located above membrane 7 and tray 8 is slidably connected to the side walls of the membrane chamber. The push rod 5 is vertically arranged and located below the upper end cover 3, a certain distance is reserved between the push rod 5 and the top of the upper end cover 3, the push rod 5 is fixedly connected with the centers of the tray 8 and the diaphragm 7, the lower end of the push rod 5 penetrates out of the upper end of the lower end cover 4 and is welded with the upper end of the valve core assembly, the push rod 5 can move along with the tray 8 and the diaphragm 7 in the same direction, and meanwhile the push rod 5 drives the valve core assembly fixedly connected below to move in the same direction, so that the valve is opened or closed. The spring 6 is located below the upper end cover 3, the spring 6 is axially arranged in the membrane chamber, the spring 6 is vertically sleeved on the outer side of the upper portion of the push rod 5, the lower end of the spring 6 is welded with the upper surface of the tray 8, and the spring 6 deforms due to the fact that the push rod 5 moves up and down. Specifically, in gaseous follow air supply interface 9 entering diaphragm chamber along second pipeline 15, along with the increase of the gaseous volume in the diaphragm chamber, 7 lower parts of diaphragm atress kickup deformations, 5 syntropy movements of push rod that 7 drive of diaphragm linked firmly, the increase of diaphragm chamber internal gas pressure, push rod 5 drives tray 8 syntropy movement simultaneously, tray 8 is along the inner wall upward movement compression spring 6 of diaphragm chamber. On the contrary, when gas flows out of the diaphragm chamber from the gas source interface 9 and enters the second pipeline 15, along with the reduction of the gas volume in the diaphragm chamber, the tray 8 moves downwards along the inner wall of the diaphragm chamber, when the gas flows out of the diaphragm chamber from the gas source interface 9 along with the pipeline, along with the reduction of the gas volume in the diaphragm chamber, the gas pressure in the diaphragm chamber is reduced, the diaphragm 7 moves downwards gradually, and the push rod 5 which is fixedly connected is driven to move downwards, meanwhile, the tray 8 on the push rod 5 slides downwards along the inner wall of the diaphragm chamber, the spring 6 extends gradually, finally, the diaphragm 7 stops moving (resets), and the spring 6 restores to the original state (resets).
In order to raise the pre-pressing force of the spring 6 on the valve core 12 through the push rod 5 after the reset, the pneumatic execution assembly also comprises ： A platen 10.
The pressing plate 10 is located inside the upper end cover 3, specifically, the pressing plate 10 is located above the spring 6, the bottom of the pressing plate 10 is fixedly connected with the upper end of the spring 6, or the bottom of the pressing plate 10 is in contact with the upper end of the spring 6, and the pressing plate 10 is in sliding connection with the side wall of the upper end cover 3, so that the pressing plate 10 can apply downward pressure to the spring 6 through the self weight, and the pre-pressing force of the push rod 5 on the valve element 12 is further improved. The shape of the pressing plate 10 and the shape of the tray 8 are matched with the shape of the inner side wall of the film chamber, and the pressing plate 10 may be a circular iron plate with a certain weight, for example, a circular iron plate with a thickness of 18 mm and a diameter of 560 mm. The round iron plate is additionally arranged in the upper end cover 3 of the pneumatic actuator, and the round iron plate can pre-press the spring 6 below.
Further, the inner diameter of the upper end cover 3 is the same as that of the lower end cover 4, the inner walls of the upper end cover 3 and the lower end cover 4 are vertically and smoothly arranged, and when the air pressure in the film chamber changes, the pressing plate 10 and the tray 8 can slide along the side wall of the film chamber conveniently.
The case subassembly includes: a stem 11 and a cartridge 12. The spool 12 is positively disposed, i.e., when the spool 12 moves downward, the flow area between the spool 12 and the valve seat decreases. The valve core 12 is made of high-temperature resistant material, the surface of the valve core 12 is ground, and the grinding treatment refers to that multi-point pits are formed on the surface of the regulating valve core 12 which works for a long time after being washed by high-temperature medium, so that the binding surface of the regulating valve core 12 and the valve seat is increased, and further, the gas leakage amount in the valve core 12 is reduced. One end of the valve core 12 is slidably connected with a valve seat positioned in the valve, namely, the valve core 12 can be in contact with the valve seat or separated from the valve seat, and the relative position of the two can be changed. The upper end of the valve rod 11 is welded with the lower end of the push rod 5, and the lower end of the valve rod 11 is welded with the other end of the valve core 12. When the valve core 12 is clamped in the valve seat, the valve is in a closed state, and when the valve core 12 is separated from the valve seat under the driving of the pneumatic actuating mechanism, the valve is in an open state.
Pressure regulating mechanism includes: a quick release valve 2 and a manual needle valve 13.
In order to quickly position the opening or closing action of the pneumatic actuating mechanism, the quick exhaust valve 2 is connected in series with the second pipeline 15 between the pneumatic actuating mechanism and the pneumatic positioner 1, namely the second pipeline 15 is divided into two sections of pipes by the block exhaust valve 2, one section of the pipe is used for communicating the quick exhaust valve 2 with the pneumatic positioner 1, and the other section of the pipe is used for communicating the quick exhaust valve 2 with the pneumatic actuating mechanism. The quick-release valve 2 can quickly transmit an opening signal sent by the pneumatic positioner 1 to the pneumatic actuating mechanism. The quick exhaust valve 2 is provided with an air inlet, an air conveying port opposite to the air inlet and an exhaust port C. The air inlet is communicated with the air conveying end 102 of the pneumatic positioner 1 through one section of the second pipeline 15, the air conveying port is communicated with the air source interface 9 through the other section of the second pipeline 15, and the air outlet C can discharge air into the atmosphere. It should be noted that, referring to fig. 1 and 2, the position a of the second pipeline is communicated with the air inlet of the quick exhaust valve, and the position B of the second pipeline is communicated with the air delivery port of the quick exhaust valve.
In order to prevent oscillation during valve adjustment, the manual needle valve 13 is connected in parallel with the quick exhaust valve 2, and meanwhile, the manual needle valve 13 is installed on the second pipeline 15, and the manual needle valve 13 is used for adjusting the pressure difference on two sides of the quick exhaust valve 2, namely, adjusting the pressure difference between the air inlet end close to the quick exhaust valve 2 and the air delivery end of the quick exhaust valve 2 or the pressure difference between the two positions of a and B on the second pipeline close to the quick exhaust valve 2, so that the pressure on the side a and the pressure on the side B of the quick exhaust valve 2 are buffered. Two ends of the manual needle valve 13 are respectively communicated with two sections of second pipelines 15 on two sides of the quick-release valve 2 through a section of pipeline, and the gas flow in the second pipelines 15 on two sides of the quick-release valve 2 is changed by adjusting the manual needle valve 13, so that the pressure difference on two sides of the quick-release valve 2 is adjusted.
For convenience of description, the inlet of the quick-release valve is called port a near the position a, the gas transmission port is called port B near the position B, and the exhaust port is called port C, and the following explains the working principle of the present application in detail:
when a control end 14 of the pneumatic positioner 1 responds to an opening analog quantity signal sent by a remote control PLC through a 4-20mA control loop, an air inlet end 101 of the pneumatic positioner 1 is opened, an air source sends air into the air inlet end 101 of the pneumatic positioner 1 through a first channel, then the air flows out of an air delivery end 102 of the pneumatic positioner 1, the air passes through a first section of second pipeline 15 and reaches an A port of the quick exhaust valve 2, then the air enters the quick exhaust valve 2 from the A port, at the moment, a C port of the quick exhaust valve 2 is in a closed state, then the air is output from a B port of the quick exhaust valve 2, the air passes through an air source port 9 of another section of second pipeline 15, then the air enters a diaphragm chamber below the diaphragm 7 through the air source port 9, the lower pressure of the diaphragm 7 is increased along with the increase of the air in the diaphragm chamber, the diaphragm 7 begins to deform towards the direction of the upper end cover 3, the diaphragm 7 drives a push rod 5 fixedly connected to move in the same direction, simultaneously the push rod 5 drives a tray 8 to move in the same direction, the tray 8 moves upwards along the inner wall of the diaphragm chamber to compress the spring 6, the spring 6 pushes a pressure plate 10 to move along the inner wall of the diaphragm chamber, the valve rod 5, the valve rod moves upwards, the valve rod 12 is also drives the valve to move, the valve to gradually, and the valve to separate valve seat 12 to separate from the valve, and the valve to separate valve, and the valve 12, and the valve to separate valve. When the control end 14 of the pneumatic positioner 1 needs to respond to a closing analog quantity signal sent by a remote PLC through a 4-20mA control loop, the air inlet end 101 of the pneumatic positioner 1 is closed, the output pressure of the pneumatic positioner 1 to the port A of the quick exhaust valve 2 is rapidly reduced, and because the internal pressure of a diaphragm chamber of the pneumatic actuating mechanism is large, the pressure of the port B of the quick exhaust valve 2 is slowly reduced, at the moment, the pressure of the port B of the pneumatic quick exhaust communicated with the bottom of the diaphragm chamber is larger than the pressure of the port A of the pneumatic quick exhaust valve 2, the port C of the quick exhaust valve 2 is opened, the air at the lower end of the diaphragm chamber reaches the port C from the port B of the quick exhaust valve 2, the air is rapidly released to the atmosphere through the port C, the pressure difference between the port B and the port A of the quick exhaust valve 2 is gradually reduced, the diaphragm 7 moves downwards along with the reduction of the pressure of the diaphragm chamber, the push rod 5 fixedly connected with the diaphragm 7 drives the push rod 5 to move downwards, the tray 8 to slide downwards along the inner wall of the diaphragm chamber, the spring 6 is gradually extended (reset), the push rod 5 moves downwards while the valve rod 11 moves, the valve seat 12 is pushed downwards, and the valve seat 12 is finally positioned and the valve is closed, and the valve is finally, and the valve seat is rapidly positioned and the valve is positioned and the valve mechanism.
It should be noted that during the adjustment process, the manual needle valve 13 may be adjusted manually to prevent valve adjustment oscillations.
After the grinding of the valve core 12 and the improvement of the pre-compression force of the spring 6, the stable output pressure of the outlet of the steam soot-blowing regulating valve is 0.8-1.8 MPa, and the actual soot-blowing requirement is met.
The application also provides an installation method for the pulverized coal boiler steam soot blowing regulating valve, which specifically comprises the following steps:
step 1) disassembling the pneumatic actuator, additionally installing a round iron plate (cover plate 10) with the thickness of 18 mm and the diameter of 560 mm in the upper end cover 3, connecting the round iron plate with the spring 6, and assembling and sealing the pneumatic actuator according to the reverse order of disassembly.
And 2) firstly, grinding the surface of a multi-point pit of the regulating valve core 12 which is washed by a high-temperature medium, and then fixing the regulating valve core 12 with a push rod 5 in the pneumatic actuating mechanism through a valve rod 11.
And 3) firstly connecting the remote PLC with the control end 14 of the pneumatic positioner 1 through signals, then communicating the air inlet end 101 of the pneumatic positioner 1 with an air source, and then communicating the air conveying end 102 of the pneumatic positioner 1 with the air source interface 9 of the pneumatic actuating mechanism through a second pipeline 15.
And 4) connecting the quick-release valve 2 in series on the second pipeline 15 between the gas transmission end 102 of the pneumatic positioner 1 and the gas source interface 9 of the pneumatic actuating mechanism.
And 5) connecting a manual needle valve 13 in parallel on two sides of the quick exhaust valve 2, and respectively communicating two ends of the manual needle valve 13 with second pipelines 15 on two sides of the quick exhaust valve 2.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of the invention or which are equivalent to the scope of the invention are embraced by the invention.
Claims (10)
1. A steam soot blowing regulating valve for a pulverized coal boiler is installed on a steam pipeline of a steam soot blower of the pulverized coal boiler, and is characterized in that the steam soot blowing regulating valve comprises:
the pneumatic actuator is internally provided with a membrane chamber for containing gas;
the upper end of the valve core assembly is fixedly connected with the pneumatic actuating mechanism so as to be driven by the pneumatic actuating mechanism to move up and down;
the air inlet end of the pneumatic positioner is communicated with an air source through a first pipeline, the air delivery end of the pneumatic positioner is communicated with the membrane chamber through a second pipeline, and the control end of the pneumatic positioner is used for receiving a valve opening degree instruction;
and the pressure regulating mechanism is arranged on the second pipeline.
2. The steam soot-blowing control valve for a pulverized coal boiler as claimed in claim 1, wherein the pneumatic actuator comprises: the pneumatic actuator comprises an upper end cover, a lower end cover and a pneumatic actuator assembly, wherein the lower end cover is arranged opposite to the upper end cover;
the upper end cover is connected with the lower end cover in a sealing manner, the inner cavities of the upper end cover and the lower end cover jointly form the membrane chamber, and the bottom of the lower end cover is provided with an air source interface communicated with the air conveying end of the second pipeline;
the pneumatic execution assembly is positioned in the membrane chamber and drives the valve core assembly to act through the flow direction of the gas.
3. The steam soot blowing control valve for a pulverized coal boiler as claimed in claim 2, wherein the pneumatic actuating assembly comprises: push rod, spring, diaphragm and tray;
the diaphragm is elastic and is fixedly positioned at the lower part of the diaphragm chamber, and a certain gap is formed between the diaphragm and the inner wall of the bottom of the lower end cover;
the tray is positioned above the membrane, and is in sliding connection with the side wall of the membrane chamber;
the push rod is vertically arranged, the push rod is fixedly connected with the center of the tray and the center of the diaphragm, and the lower end of the push rod penetrates through the lower end cover to be fixedly connected with the upper end of the valve core assembly;
the spring is located below the upper end cover, the spring sleeve is arranged on the outer side of the upper portion of the push rod, and the lower end of the spring is fixedly connected with the upper surface of the tray.
4. The governing valve for steam soot blowing of pulverized coal fired boiler as defined in claim 3, wherein the pneumatic actuator assembly further comprises ： Pressing a plate;
the pressing plate is located below the upper end cover and connected with the upper end of the spring, the pressing plate is connected with the side wall of the upper end cover in a sliding mode, and the shapes of the pressing plate and the tray are matched with the shape of the inner side wall of the film chamber.
5. The steam soot-blowing regulating valve for the pulverized coal boiler as claimed in claim 3, wherein the inner diameters of the upper end cover and the lower end cover are the same, and the inner walls of the upper end cover and the lower end cover are both vertically and smoothly arranged.
6. The steam soot blowing control valve for a pulverized coal boiler as claimed in claim 3, wherein the spool assembly comprises: a valve stem and a valve core;
the valve core is arranged in a positive mode, and one end of the valve core is connected with a valve seat in the valve in a sliding mode;
the upper end of the valve rod is fixedly connected with the lower end of the push rod, and the lower end of the valve rod is fixedly connected with the other end of the valve core.
7. The steam soot-blowing control valve for a pulverized coal boiler as claimed in claim 2, wherein the pressure regulating mechanism comprises: a quick discharge valve;
the quick discharge valve is connected to the second pipeline in series;
the quick exhaust valve is provided with an air inlet, an air transmission port and an air exhaust port, the air inlet is communicated with the air transmission end of the pneumatic positioner, and the air transmission port is communicated with the air source interface.
8. The steam soot blowing control valve for a pulverized coal fired boiler as defined in claim 7, wherein the pressure regulating mechanism further comprises: a manual needle valve;
the manual needle valve and the quick-release valve are arranged in parallel and are arranged on the second pipeline, and the manual needle valve is used for adjusting the pressure difference on two sides of the quick-release valve.
9. The steam soot-blowing regulating valve for the pulverized coal boiler as claimed in claim 1, wherein the control end of the pneumatic positioner is in signal connection with a remote PLC, and the pneumatic actuator is a single-acting pneumatic actuator.
10. The coal powder boiler steam soot-blowing regulating valve as claimed in claim 6, wherein the surface of the valve core is ground, and the output pressure of the steam soot-blowing regulating valve is 0.8-1.8 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222993949.9U CN218818507U (en) | 2022-11-10 | 2022-11-10 | Steam soot blowing regulating valve for pulverized coal fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222993949.9U CN218818507U (en) | 2022-11-10 | 2022-11-10 | Steam soot blowing regulating valve for pulverized coal fired boiler |
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| Publication Number | Publication Date |
|---|---|
| CN218818507U true CN218818507U (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222993949.9U Active CN218818507U (en) | 2022-11-10 | 2022-11-10 | Steam soot blowing regulating valve for pulverized coal fired boiler |
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| Country | Link |
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| CN (1) | CN218818507U (en) |
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