CN212299048U - Powder making system - Google Patents
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- CN212299048U CN212299048U CN202021152143.1U CN202021152143U CN212299048U CN 212299048 U CN212299048 U CN 212299048U CN 202021152143 U CN202021152143 U CN 202021152143U CN 212299048 U CN212299048 U CN 212299048U
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Abstract
The utility model relates to a powder making system, which is carried in a boiler system and comprises an air-powder homogenizing coal mill which is connected to the boiler system through a plurality of coal powder pipelines; each pulverized coal pipeline is sequentially provided with a pulverized coal concentration regulating valve, a pulverized coal flow regulating valve, a pulverized coal concentration detection sensor and a pulverized coal flow detection device from the end close to the air-powder homogenizing coal grinding machine to the end of a boiler system; the industrial control computer is provided with a control system which is connected with a wind-powder homogenizing coal mill, a coal powder concentration regulating valve, a coal powder flow regulating valve and a coal powder concentration detectorMeasurement sensor, pulverized coal flow detection device, and in-furnace flame detection sensor, flue gas fly ash carbon content detection sensor, and flue gas NO in boiler systemXThe detection sensor is electrically connected with the flue gas CO detection sensor. Through the comparison of the target values of the industrial personal computer, the coal powder concentration, the flow detection signals and the coal quality condition on each coal powder pipeline are combined, and an instruction is sent to each actuator, so that the air powder deviation in each coal powder pipeline is reduced, and the fine control is achieved.
Description
Technical Field
The utility model relates to a powder process equipment technical field, more specifically the saying so relates to a powder process system.
Background
The coal mill and a plurality of coal powder pipelines connected with the coal mill form a coal pulverizing system, and the coal pulverizing system is responsible for grinding raw coal into coal powder with qualified fineness and conveying the coal powder to a boiler for combustion. The primary air and the raw coal enter the coal mill simultaneously, the primary air carries the ground coal powder in the coal mill and enters the coal powder separator, and after coarse and fine powder separation, the primary air continues to carry the coal powder to enter the coal powder pipeline until the coal powder enters the boiler. In order to improve the combustion efficiency of the boiler and the operation safety of the boiler, the fineness of the pulverized coal in each pulverized coal pipeline, the concentration of the pulverized coal and the flow rate of the pulverized coal are required to be consistent as much as possible.
Through a large amount of experimental research of utility model people, it is very big to discover the deviation of wind powder in the coal dust pipeline of current powder process system, and wherein buggy volume deviation, buggy fineness deviation, buggy concentration deviation are all very big, and the deviation is very general more than 30%, surpasss +/-50% even a bit. Boiler coking, pipe explosion, uneven temperature field, high fly ash carbon content, large NOx generation amount and the like are directly related to air-powder deviation, so that air-powder homogenization of a powder preparation system is of great importance to improving the economical efficiency and safety of boiler operation.
The existing coal pulverizing system is generally a rough coal pulverizing system, and can only control the total output of each coal mill, the total primary air amount, the total coal powder fineness and the total coal powder uniformity, but cannot control the state of an air-powder mixture in each coal powder pipeline finely.
Through a large amount of experimental research findings of utility model people: the reason that can't be to the meticulous control of wind powder mixture state is that the coal pulverizer can not carry out abundant homogenization treatment to the wind powder mixture on the one hand, and traditional coal pulverizer only focuses on the ability of grinding into the buggy with raw coal, does not carry out the project organization of homogenization treatment to the wind powder mixture, especially medium speed coal pulverizer, and self just exists and causes the structure that the wind powder is serious uneven, so, when the wind powder mixture reachd the coal pulverizer export, no matter there is very big deviation in buggy concentration or buggy fineness. On the other hand, the pulverized coal pipeline can only control the flow velocity of primary air through the adjustable shrinkage cavity, and even if the concentration of pulverized coal is detected in real time, the concentration of the pulverized coal is found to have deviation through research, no method is available for adjusting the concentration of the pulverized coal. A large amount of test data show that the deviation of air and powder in a coal powder pipeline of the existing pulverizing system is large, wherein the deviation of coal powder quantity, the deviation of coal powder fineness and the deviation of coal powder concentration are large, the deviation is more than +/-30 percent and is common, and some deviation even exceeds +/-50 percent. Boiler coking, pipe explosion, uneven temperature field, high fly ash carbon content, large NOx generation amount and the like are directly related to air-powder deviation, so that fine control of the air-powder mixture state is crucial to improving the economical efficiency and safety of boiler operation.
Therefore, how to provide a powder making system to achieve fine control of the state of the air-powder mixture is a problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to provide a powder preparation system solves among the prior art wind powder mixture state and can't obtain meticulous control, and the deviation that leads to wind powder in each buggy pipeline is very big, and then leads to the economic nature and the security of boiler operation poor.
The utility model provides a powder making system, it is carried in boiler system, include:
the air-powder homogenizing coal mill is connected to the boiler system through a plurality of coal powder pipelines; each pulverized coal pipeline is sequentially provided with a pulverized coal concentration regulating valve, a pulverized coal flow regulating valve, a pulverized coal concentration detection sensor and a pulverized coal flow detection device from the end close to the air-powder homogenizing coal grinding machine to the end of a boiler system;
and an industrial control computer, on which a control system is mounted, and which is connected with the air-powder homogenizing coal mill, the coal powder concentration regulating valve, the coal powder flow regulating valve, the coal powder concentration detection sensor, the coal powder flow detection device, and the in-furnace flame detection sensor, the flue gas fly ash carbon content detection sensor, the flue gas NO in the boiler systemXThe detection sensor is electrically connected with the flue gas CO detection sensor.
Through the technical scheme, compared with the prior art, the utility model discloses a provideA powder making system obtains the combustion condition of flame in a boiler, the carbon content of flue gas fly ash and NO in a boiler through an industrial personal computerXAnd CO content information; comparing with a target value in a control system, sending an instruction to an air-powder homogenizing coal mill by combining coal powder concentration detection and coal powder flow detection signals on each coal powder pipeline and coal quality conditions, controlling the fineness of coal powder, sending an instruction to a coal powder concentration regulating valve and a coal powder flow regulating valve, regulating the air-powder state in each coal powder pipeline, and forming closed-loop control through multiple detection, comparison and regulation to enable a boiler system to tend to an optimal combustion state; therefore, the air-powder deviation in each pulverized coal pipeline is reduced, fine control is achieved, and the economical efficiency and the safety of boiler operation are guaranteed.
Further, the wind powder homogenizing coal mill comprises:
the coal pulverizer comprises a coal pulverizer shell, wherein a discharge hole is formed in the top of the coal pulverizer shell, one end of a pulverized coal pipeline is communicated with the discharge hole, and a primary air pipe communicated with the coal pulverizer shell is arranged on the side wall of the bottom of the coal pulverizer shell;
the material powder conveying assembly penetrates through the center of the top of the coal mill shell, is inserted into the coal mill shell and is communicated with the interior of the coal mill shell;
the powder grinding assembly is rotatably connected to the bottom of the coal mill shell and is arranged opposite to the powder conveying assembly;
the powder homogenizing assembly comprises a driving mechanism and a homogenizing rotor, the driving mechanism is arranged at the top of the coal mill shell, the homogenizing rotor is arranged in the coal mill shell and is arranged opposite to the powder grinding assembly, the driving mechanism drives the homogenizing rotor to rotatably sleeve the powder conveying assembly, and an air inlet and an air outlet are formed in the bottom and the side wall of the homogenizing rotor respectively; the driving mechanism is electrically connected with the industrial personal computer;
and one end of the central air inlet assembly is communicated with the primary air pipe, and the other end of the central air inlet assembly is an air outlet end which is bent and inserted into the shell of the coal mill and communicated with the material powder conveying assembly.
Therefore, by utilizing the material powder grinding assembly arranged opposite to the material powder conveying assembly, the material powder can be fully ground, and the particle size of the material powder is reduced; part of primary air can directly enter the material powder conveying assembly by utilizing the central air inlet assembly, and part of the primary air is blown to the center of the material powder grinding assembly through the material powder conveying assembly, so that the condition of uneven grinding of the primary air is improved, and the problem of uneven wind powder caused by uneven grinding of the primary air is weakened; the air-powder mixture in the shell of the coal mill can be homogenized by the homogenizing rotor, and the homogenized air-powder mixture enters an annular area between the homogenizing rotor and the shell of the coal mill, so that the air-powder mixture is further homogenized, and the air-powder mixture achieves the effect of fully mixing and homogenizing. The utility model discloses a coal pulverizer structural design with wind powder homogenization function is reasonable, when carrying out thickness separation to the buggy, can also carry out homogenization treatment to the wind powder mixture, and wind powder homogenization is effectual, has effectively reduced the wind powder deviation in the buggy pipeline, has improved the combustion efficiency of boiler and the security of operation, has good application prospect.
Furthermore, the central air inlet assembly comprises an air inlet pipe, an air sleeve and a regulating valve, wherein one end of the air inlet pipe is communicated with the primary air pipe, and the other end of the air inlet pipe is communicated with the side wall of the air sleeve to form a whole; one end of the air sleeve and one end of the air inlet pipe are bent and inserted into the shell of the coal mill, and the air sleeve is sleeved and fixed at the lower end of the material powder conveying assembly; the governing valve sets up on the air-supply line, governing valve and industrial computer electric connection. Utilize the air-supply line can make partly wind directly get into the coal pulverizer center from this, blow partly wind to the material powder grinding assembly center through the wind cover, improved the wind and gone into the inhomogeneous situation of mill, weakened because the wind powder that once wind went into mill inhomogeneous and cause uneven problem, utilize the governing valve can be according to actual behavior, adjust the air volume.
Further, the homogenizing rotor comprises a central pipe, a cone, blades, a bottom ring and a choke block, and the driving mechanism drives the central pipe to be rotatably sleeved on the material powder conveying assembly; the cone comprises an upper plate and a lower plate, the upper plate is a circular table top with a hole in the middle, the lower plate is an inverted circular table top with a hole in the middle, the opposite side edges of the upper plate and the lower plate are fixedly connected, and the upper plate and the lower plate are fixedly sleeved on the outer side of the central tube; the blades are multiple, the blades are evenly arranged on the same circumferential surface along the side wall of the central tube, the tops of the blades are fixedly connected to the bottom end face of the lower plate, the bottom ring is fixed to the outer sides of the lower ends of the blades, an air inlet is formed in the middle of the bottom ring, multiple air outlets are formed among the blades, the lower plate and the bottom ring, and the wind blocking block is fixed to the air outlet and used for changing the air outlet wind direction and the air outlet area of the air outlets.
When the homogenizing rotor is at the uniform velocity rotatory, thereby the wind-powder mixture can be driven by the homogenizing rotor and inhaled in the little cavity that a plurality of blades formed via the air intake of bottom, along with the little cavity is together rotatory, simultaneously the wind-powder mixture still can be from bottom to top, from inside to outside motion to discharge via the air outlet of side, the setting of choke block can further change the outlet structure and the size of air outlet, the motion state diverse when making the wind-powder mixture discharge from the little cavity reaches the effect of intensive mixing homogenization.
Furthermore, the choke blocks are fixedly filled at the upper ends of the inner sides of the air outlets at intervals and are fixedly connected with the lower plate and the blades on the two sides, and the area difference between any two adjacent air outlets is 10% -25%;
or the air outlets are groups, each group of air outlets comprises a plurality of adjacent air outlets, each group of air outlets is fixedly filled with the wind-blocking blocks at the upper end of the inner side in sequence, the wind-blocking blocks are fixedly connected with the lower plate and the blades at the two sides, the height of each group of air outlets is gradually increased, and the area difference between any two adjacent air outlets is 10% -25%.
Adopt first scheme to adjust the air outlet size through setting up the choke block, make the air-out area change of adjacent air outlet to the motion state diverse when making the wind-powder mixture discharge from the loculus reaches the effect of intensive mixing homogenization.
In particular, the amount of the solvent to be used,
adopt the second scheme, carry out structural adjustment through regular to the homogenization rotor, guaranteed the stability of homogenization rotor rotation operation, the setting that the air outlet height progressively increases up makes the air-out area of every air outlet in every group air outlet all inequality, but the air-out total area between group and the group is the same to can form the relative more stable wind dirt and mix the district of circling round, make the wind powder mixture reach the effect of intensive mixing homogenization better.
Furthermore, the homogenizing rotor also comprises a plurality of blade fins, and the blade fins are fixed on the outer side of the wind blocking block on the non-symmetrical and non-identical circumference. The blade fin can further disturb an annular airflow region formed between the homogenizing rotor at the outer side of the air outlet and the shell of the coal mill, so that the air powder homogenizing effect in the annular region is further improved.
Further, each pulverized coal concentration adjusting valve comprises:
the shell is vertically fixed between the air-powder homogenizing coal mill and the coal powder pipeline, an air-powder mixture inlet is formed at the bottom of the shell, an air-powder mixture outlet is formed at the top of the shell, and a coal powder concentration adjusting cavity is formed between the air-powder mixture inlet and the air-powder mixture outlet;
the side wall of the shell is connected with a driving part which is electrically connected with the industrial personal computer;
the side wall of the shell is provided with a bearing seat in the direction vertical to the driving part; one end of the shaft is driven by the driving part to rotate in the bearing seat;
and the two groups of valve plates are arranged on the shaft and can be opened and closed in the coal powder concentration adjusting cavity to form a flow intercepting area so as to change the flow intercepting area in the coal powder concentration adjusting cavity.
The driving shaft of the driving part rotates to drive the two valve plates to be opened and closed to form a closure area in the pulverized coal concentration adjusting cavity so as to change the closure area in the pulverized coal concentration adjusting cavity and further change the pulverized coal concentration in the pulverized coal pipeline.
Further, the driving part includes: the driving motor, the screw rod, the driving frame and the driving gear; the driving motor is fixed on the side surface of the shell through a bracket; the output end of the screw rod is in power connection with the screw rod; the driving frame is of a rectangular frame structure, two groups of racks are arranged on two inner walls opposite to each other in the vertical direction in a staggered manner, and two groups of driving gears and two groups of racks are respectively in corresponding meshing transmission; the two groups of driving gears are connected with one end of the shaft; the bottom of the driving frame is provided with a threaded hole, the screw rod is in matched transmission with threads in the threaded hole, and the driving motor is electrically connected with the industrial personal computer; the shaft comprises a first shaft lever and a second shaft lever, one end of the first shaft lever is integrated with the first valve plate, the second shaft lever is in a shaft sleeve shape and is hinged to the other end of the first shaft lever, the end part of the other end of the first shaft lever is connected with a first driving gear, the second shaft lever is integrated with the second valve plate, and the end part of the second shaft lever is connected with a second driving gear; the first driving gear and the second driving gear are respectively meshed with a group of racks correspondingly so as to drive the first valve plate and the second valve plate to open and close through the first shaft lever and the second shaft lever to change the size of the intercepting area; the first valve plate and the second valve plate are the same in length and form an isosceles triangle in an open state with the shaft as the center.
From this, driving motor drives the screw rod and rotates, and the screw rod drives the drive frame linear motion from top to bottom, and when the drive frame downstream, rack and drive gear meshing drive gear rotatory, and two sets of drive gear direction of rotation are opposite, and a clockwise rotation, an anticlockwise rotation, and then drive two sets of valve plates and rotate towards opposite direction, and the through-flow sectional area in the casing changes thereupon.
Furthermore, the outer walls of the first driving gear and the second driving gear respectively comprise a cylindrical section and a tooth-shaped section, the cylindrical section is overlapped with a tooth root circle of the tooth-shaped section, and the cylindrical section accounts for 50% -55% of the circumferential length of the tooth root circle of the tooth-shaped section; the width of each group of racks is half of the width of the inner wall of the frame of the driving frame. The fit clearance between the driving gear and the rack is adjusted; make drive gear cylinder section and the frame contact that does not have the rack, can guarantee the fit clearance between rack and the drive gear, prevent that the clearance is too big, lead to the valve plate shake of being connected with drive gear, reduced the shake frequency of valve plate from this, guarantee its normal work, and then prolonged its life.
The utility model provides a powder process method based on above-mentioned powder process system does, control system that the industrial computer carried receives in the boiler system feedback in the interior flame combustion situation of stove, flue gas flying dust carbon content, NOXAnd CO content information; and comparing the coal powder concentration with the target value in the control system, and combining the coal powder concentration detection and coal powder flow detection information on each coal powder pipelineAnd the number and the coal quality condition send instructions to an air-powder homogenizing coal mill to control the fineness of the coal powder, and send instructions to a coal powder concentration regulating valve and a coal powder flow regulating valve to regulate the air-powder state in each coal powder pipeline, and a closed-loop control is formed through multiple times of detection, comparison and regulation, so that the boiler system tends to the optimal combustion state. Therefore, the air-powder deviation in each pulverized coal pipeline is reduced, fine control is achieved, and the economical efficiency and the safety of boiler operation are guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a powdering system according to the present invention;
FIG. 2 is a schematic structural diagram of a coal mill with a wind power homogenizing mechanism;
FIG. 3 is a diagram illustrating the flow path of the air flow inside the air-powder homogenizing coal mill provided by the present invention;
FIG. 4 is a schematic structural view of a central air intake assembly;
FIG. 5 is a sectional view of the homogenizing rotor (with the windage blocks and fins removed);
FIG. 6 shows a front view of the homogenizing rotor in the form of a first embodiment of construction;
FIG. 7 is a perspective view of the view of FIG. 6;
FIG. 8 is a bottom view of the FIG. 6 drawing;
FIG. 9 is a front view of the homogenizing rotor in a second embodiment constructive form;
FIG. 10 is a perspective view of the view of FIG. 9;
FIG. 11 is a bottom view of the drawing of FIG. 9;
FIG. 12 is a front view of the homogenizing rotor in a third embodiment form of construction;
FIG. 13 is a perspective view of the view of FIG. 12;
FIG. 14 is a bottom view of the drawing of FIG. 12;
FIG. 15 is a side view of the pulverized coal concentration adjusting valve;
FIG. 16 is a cross-sectional view taken along line A-A of FIG. 15;
FIG. 17 is a cross-sectional view taken along line B-B of FIG. 16;
FIG. 18 is a schematic view showing the connection of the shaft, valve plate, drive gear, rack and drive carrier;
FIG. 19 is a schematic view showing the connection of the first shaft, the second shaft, the first valve plate, the second valve plate, the first driving gear and the second driving gear;
FIG. 20 is a schematic view (i.e., a schematic view) illustrating an operation state of the pulverized coal concentration adjusting valve in an open state;
in the figure: 10-boiler system, 11-flame detection sensor, 12-flue gas fly ash carbon content detection sensor, 13-flue gas NOXThe device comprises a detection sensor, a 14-flue gas CO detection sensor, a 20-air powder homogenizing coal mill, a 21-coal mill shell, a 211-discharge port, a 22-primary air pipe, a 23-material powder conveying assembly, a 24-material powder grinding assembly, a 241-grinding disc mechanism, a 242-grinding roller mechanism, a 243-spring loading mechanism, a 25-material powder homogenizing assembly, a 251-driving mechanism, a 252-homogenizing rotor, a 2521-air inlet, a 2522-air outlet, a 2523-central pipe, a 2524-cone, an 25241-upper plate, a 25242-lower plate, a 2525-blade, a 2526-bottom ring, a 2527-wind blocking block, a 25271-A block, a 25272-B block, a 25273-C block, a 2528-blade fin, a 26-central air inlet assembly, a 261-air inlet pipe and a 262-air sleeve, 263-regulating valve, 264-wear-resistant guard plate, 30-pulverized coal concentration regulating valve, 31-shell, 311-bearing seat, 32-driving part, 321-driving motor, 322-screw rod, 323-driving frame, 324-driving gear, 3241-first driving gear, 3242-second driving gear, 325-rack, 33-shaft, 331-first shaft rod, 332-second shaft rod, 34-valve plate, 341-first valve plate, 342-second valve plate, 40-pulverized coal flow regulating valve, 50-pulverized coal concentration detection sensor, 60-pulverized coal flow detection device, 70-industrial personal computer and L-pulverized coal pipeline.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the present invention provides a pulverizing system, which is mounted in a boiler system 10, comprising:
a wind powder homogenizing coal mill 20, the wind powder homogenizing coal mill 20 being connected to the boiler system 10 through a plurality of pulverized coal pipes L; each pulverized coal pipeline L is sequentially provided with a pulverized coal concentration regulating valve 30, a pulverized coal flow regulating valve 40, a pulverized coal concentration detection sensor 50 and a pulverized coal flow detection device 60 from the end close to the air-powder homogenizing coal mill 20 to the end of the boiler system 10;
and an industrial control computer 70, wherein the industrial control computer 70 is provided with a control system which is connected with the air-powder homogenizing coal mill 20, the coal powder concentration regulating valve 30, the coal powder flow regulating valve 40, the coal powder concentration detection sensor 50, the coal powder flow detection device 60, the furnace flame detection sensor 11, the flue gas fly ash carbon content detection sensor 12 and the flue gas NO in the boiler system 10XThe detection sensor 13 is electrically connected with the flue gas CO detection sensor 14.
The utility model discloses a system of making powder, through flame combustion situation, flue gas flying dust carbon content, NO in the stove of acquireing the boiler at the industrial computerXAnd CO content information; comparing with the target value in the control system, combining the coal powder concentration detection and coal powder flow detection signals on each coal powder pipeline and the coal quality condition, sending an instruction to an air powder homogenizing coal mill to control the fineness of the coal powder, sending an instruction to a coal powder concentration regulating valve and a coal powder flow regulating valve to regulate the air powder state in each coal powder pipeline, and detecting and comparing for multiple timesThe adjustment forms closed-loop control, so that the boiler system tends to the optimal combustion state; therefore, the air-powder deviation in each pulverized coal pipeline is reduced, fine control is achieved, and the economical efficiency and the safety of boiler operation are guaranteed.
Wherein, a control system carried by the industrial personal computer can adopt an YF-20 pulverizing control system; the detecting elements in the boiler system are all devices equipped in the existing boiler system, the flame detecting sensor in the boiler can adopt any one of an ultraviolet flame detector, a visible light flame detector or an infrared flame detector, the carbon content detecting sensor of the flue gas fly ash can adopt FAD-300 type, and the NO of the flue gas isXThe detection sensor can adopt any existing model, and the flue gas CO detection sensor can adopt a COM-200 model.
The pulverized coal flow control valve adopts a pulverized coal pipeline resistance adjusting device disclosed in patent document 20182042736.1, and the pulverized coal pipeline resistance adjusting device can adjust in real time according to the resistance condition in the pulverized coal pipeline, so as to ensure that the resistance deviation in each pulverized coal pipeline is within an allowable range, and further adjust the pulverized coal flow in each pulverized coal pipeline. The industrial personal computer is electrically connected with the electric actuator.
The coal powder concentration detection sensor can adopt DKND-B type coal powder concentration speed on-line monitoring, and the detection process is as follows: three sensor probes are arranged on the cross section of the primary air powder pipeline, the probes are inserted into the pipeline to form 120-degree angle distribution, and the probes in the pipeline and the pipeline wall are in an insulation state. When charged coal dust flows through the probe, the sensor can effectively receive charge migration signals in the area near the probe, and the processed signals can reflect the concentration of the coal dust. The probe of the pulverized coal concentration detection sensor is made of a high-wear-resistance special material, the charge induction sensitivity is high, the service life is ultra-long, and the sensor is further provided with a sealed waterproof shell and a cable connector, so that the working stability of the sensor is guaranteed. The coal powder concentration detection sensors are distributed according to 120 degrees, the detection can be guaranteed to cover all pipeline sections, so that the influence of unstable coal powder flow distribution on a detection result is reduced, three signals are led out by the three sensors, and the three signals are respectively transmitted to the industrial personal computer through the three coaxial cables.
The coal powder flow detection device can adopt an existing BR-MODEL50 coal powder flow monitor-dust flow meter, can also adopt a Venturi tube to measure the wind speed, and can calculate the coal powder flow by combining the concentration measured by a coal powder concentration sensor, or can be realized by adopting other modes.
Referring to fig. 2-5, the wind power homogenizing coal mill 20 includes:
a discharge hole 211 is formed in the top of the coal mill shell 21, one end of a coal powder pipeline L is communicated with the discharge hole 211, and a primary air pipe 22 communicated with the coal powder pipeline L is arranged on the side wall of the bottom of the coal mill shell 21;
the powder conveying assembly 23 penetrates through the center of the top of the coal mill shell 21, is inserted into the coal mill shell 21, and is communicated with the interior of the coal mill shell 21;
the powder grinding assembly 24 is rotatably connected to the bottom of the coal mill shell 21 and is opposite to the powder conveying assembly 23;
the material powder homogenizing assembly 25, the material powder homogenizing assembly 25 includes the driving mechanism 251 and the homogenizing rotor 252, the driving mechanism 251 is set on the top of the coal mill casing 21, the homogenizing rotor 252 is set in the coal mill casing 21 and is arranged opposite to the material powder grinding assembly 24, and the driving mechanism 251 drives the homogenizing rotor 252 to rotate and sleeve on the material powder conveying assembly 23, the bottom and the side wall of the homogenizing rotor 252 are respectively formed with the air inlet 2521 and the air outlet 2522; the driving mechanism 251 is electrically connected with the industrial personal computer 70;
and a central air inlet component 26, wherein one end of the central air inlet component 26 is communicated with the primary air pipe 22, and the other end is an air outlet end which is inserted into the coal mill shell 21 in a bent manner and is communicated with the material powder conveying component 23.
The material powder grinding assembly is realized by adopting the existing structure and can comprise a grinding disc mechanism, a grinding roller mechanism and a spring loading mechanism, the grinding disc mechanism is rotatably connected to the bottom of the coal mill shell and is arranged opposite to the coal dropping pipe outlet and the homogenizing rotor, one end of the grinding roller mechanism is fixed on the side wall of the coal mill shell by utilizing a limiting rod, the other end of the grinding roller mechanism is abutted to the top of the grinding disc mechanism, and one end of the spring loading mechanism is inserted into the side wall of the coal mill shell and is abutted to the grinding roller mechanism.
Referring to fig. 4, the central air intake assembly 26 includes an air inlet pipe 261, an air sleeve 262 and a regulating valve 263, wherein one end of the air inlet pipe 261 is communicated with the primary air pipe 22, and the other end is communicated with the side wall of the air sleeve 262 to form a whole; the air sleeve 262 and one end of the air inlet pipe 261 are bent and inserted into the coal mill shell 21, and the air sleeve 262 is sleeved and fixed at the lower end of the material powder conveying assembly 23; the regulating valve 263 is disposed on the air inlet pipe 261, and the regulating valve 263 is electrically connected to the industrial personal computer 70.
Advantageously, the central air inlet assembly further comprises a wear-resistant guard plate, the cross section of the wear-resistant guard plate is semicircular, and the wear-resistant guard plate is fixed to the bottom of the other end of the air inlet pipe and corresponds to the position of the air flowing direction in the shell of the coal mill. The air inlet pipe has the beneficial effects that the air flow formed when the air-powder mixture moves from bottom to top erodes and wears the bottom of the air inlet pipe seriously, and the wear-resistant guard plate can play a role in protecting the air inlet pipe. The wear-resistant guard plate is made of wear-resistant materials, such as wear-resistant steel plates.
Referring to fig. 5-14, in an embodiment of the present invention, the homogenizing rotor 252 includes a central tube 2523, a cone 2524, blades 2525, a bottom ring 2526, and a choke block 2527, and the driving mechanism 251 drives the central tube 2523 to rotatably sleeve on the powder conveying assembly 23; the cone 2524 comprises an upper plate 25241 and a lower plate 25242, the upper plate 25241 is a circular table with an opening in the middle, the lower plate 25242 is a circular table with an opening in the middle, opposite side edges of the upper plate 25241 and the lower plate 25242 are fixedly connected, and the upper plate 25241 and the lower plate 25242 are both fixedly sleeved outside the central tube 2523; the number of the blades 2525 is multiple, the multiple blades 2525 are uniformly arranged on the same circumferential surface along the side wall of the central tube 2523, the tops of the multiple blades 2525 are fixedly connected to the bottom end surface of the lower plate 25242, the bottom ring 2526 is fixed outside the lower ends of the multiple blades 2525, an air inlet 2521 is formed in the middle of the bottom ring 2526, multiple air outlets 2522 are formed between the multiple blades 2525 and the lower plate 25242 and the bottom ring 2526, and the wind blocking block 2527 is fixed at the air outlet 2522 for changing the air outlet direction and the air outlet area of the air outlet 2522. The blades can be 16-36.
In another embodiment of the present invention, the choke blocks 2527 are fixed and filled at the inner upper end of the air outlets 2522 at intervals, and are fixedly connected to the lower plate 25242 and the blades 2525 at both sides, and the area difference between any two adjacent air outlets 2522 is 10% to 25%;
in other embodiments of the present invention, the air outlets 2522 are 4 to 6 groups, each group of air outlets 2522 includes a plurality of adjacent air outlets 2522, each group of air outlets 2522 is sequentially and fixedly filled with a choke block 2527 at the upper end of the inner side, the choke block 2527 is fixedly connected to the lower plate 25242 and the blades 2525 at two sides, the height of each group of air outlets 2522 is gradually increased and the area difference between any two adjacent air outlets 2522 is 10% to 25%.
In the embodiment of the present invention, referring to fig. 6-8, the wind-blocking block includes a block a 25271, a block B25272, and a block C25273, the block C25273 is a vertically arranged triangular prism, the top of the block C25273 is fixed on the lower plate, the bottom of the block C25273 is fixed on the bottom ring to change the wind direction and the wind area of the wind outlet, one of the vertical edges of the block C25273 faces the wind outlet channel, and the side corresponding to the vertical edge facing the wind outlet channel is arc-shaped; the A block 25271 is a vertically arranged triangular prism, the top of the A block 25271 is fixed on the lower plate, the bottom of the A block 25271 is fixed on the bottom ring to change the air outlet wind direction and the air outlet area of the air outlet, and one side surface of the A block 25271 is fixedly connected with the blade; the B block 25272 is arranged in a mirror image of the A block 25271, and the C block 25273, the A block 25271 and the B block 25272 are sequentially arranged in sequence, and one or more air outlets are arranged among each group of the C block 25273, the A block 25271 and the B block 25272. Adopt the beneficial effect that above-mentioned technical scheme produced, C piece 25273 both can effectual change the area of air outlet, and make the air-out wind direction change along the side of triangular prism, make it mix the wind-powder, improve the homogenization effect, because A piece 25271, B piece 25272 and C piece 25273 set up in the different positions of loculus, and A piece 25271, B piece 25272 and C piece 25273 width also are different each other, thereby can produce different effects of damming to the loculus, and then make the motion state diverse when wind-powder mixture discharges from the loculus, reach the effect of intensive mixing homogenization.
In the embodiment of the utility model, see fig. 9-14, but optional exclusive use C piece 25273, A piece 25271, B piece 25272 in the in-service use also can make up the use with C piece 25273, A piece 25271, B piece 25272, and its aim at can change the exit structure and the area of air outlet, and the motion state diverse when making the wind-powder mixture discharge from the air-out passageway reaches the effect of intensive mixing homogenization. Furthermore, the area of the side edges of the block C25273, the block A25271 and the block B25272 facing the air outlet is 10% -25% of the area of the air outlet.
Advantageously, the homogenizing rotor 252 further includes a plurality of fins 2528, the fins 2528 being in plurality, and the plurality of fins 2528 being asymmetrically and non-uniformly circumferentially fixed outside the choke block 2527.
In an embodiment of the present invention, referring to fig. 15 to 19, each coal powder concentration adjusting valve 30 includes:
the shell 31 is vertically fixed between the air-powder homogenizing coal mill 20 and the coal powder pipeline L, an air-powder mixture inlet is formed at the bottom of the shell 31, an air-powder mixture outlet is formed at the top of the shell, and a coal powder concentration adjusting cavity is formed between the air-powder mixture inlet and the air-powder mixture outlet;
a driving part 32, wherein the side wall of the shell 31 is connected with the driving part 32, and the driving part 32 is electrically connected with the industrial personal computer 70;
a shaft 33, a bearing seat 311 is arranged on the side wall of the shell 31 in the direction vertical to the driving part 32; one end of the shaft 33 is driven by the driving part 32 to rotate in the bearing seat 311;
and the valve plates 34, two groups of valve plates 34 are installed on the shaft 33, and the two groups of valve plates 34 can be opened and closed in the pulverized coal concentration adjusting cavity to form a cut-off area so as to change the cut-off area in the pulverized coal concentration adjusting cavity.
The air-powder mixture inlet of the shell is rectangular, and the air-powder mixture outlet is circular; is convenient to be connected in the pulverized coal pipeline.
Referring to fig. 16, the driving part 32 includes: a driving motor 321, a screw rod 322, a driving frame 323 and a driving gear 324; the driving motor 321 is fixed on the side of the shell 31 through a bracket; the output end of the power transmission mechanism is in power connection with a screw rod 322; the driving frame 323 is a rectangular frame structure, two groups of racks 325 are arranged on two opposite inner walls along the vertical direction in a staggered manner, and two groups of driving gears 324 are in corresponding meshing transmission with the two groups of racks 325 respectively; both sets of drive gears 324 are connected to one end of the shaft 33; a threaded hole is formed in the bottom of the driving frame 323, the screw rod 322 is in matched transmission with threads in the threaded hole, and the driving motor 321 is electrically connected with the industrial personal computer 70; the shaft 33 includes a first shaft 331 and a second shaft 332, one end of the first shaft 331 is integrated with the first valve plate 341, the second shaft 332 is in a shaft sleeve shape and hinged to the other end of the first shaft 331, the other end of the first shaft 331 is connected with a first driving gear 3241, the second shaft 332 is integrated with the second valve plate 342, and the end of the second shaft is connected with a second driving gear 3242; the first driving gear 3241 and the second driving gear 3242 are respectively meshed with a set of racks 325, so that the first valve plate 341 and the second valve plate 342 are driven to open and close through the first shaft rod 331 and the second shaft rod 332 to change the size of the interception area; first valve plate 341 and second valve plate 342 have the same length, and are opened around shaft 33 to form an isosceles triangle.
Referring to fig. 18-19, the outer walls of the first driving gear 3241 and the second driving gear 3242 both include a cylindrical section and a tooth-shaped section, the cylindrical section coincides with the root circle of the tooth-shaped section, and the cylindrical section occupies 50% -55% of the circumference of the root circle of the tooth-shaped section; the width of each set of racks 325 is half of the width of the inner wall of the frame of the driving frame 323.
Referring to fig. 20, the adjustment of the pulverized coal concentration adjustment valve is: the air-powder mixture enters from the air-powder mixture inlet and moves vertically upwards, the first valve plate and the second valve plate form an isosceles triangle fluid intercepting body together in the coal powder concentration adjusting cavity, and the primary air and the isosceles triangle fluid intercepting body can bypass the fluid intercepting body and continue to move upwards from two sides of the fluid intercepting body; when the pulverized coal particles move to the isosceles triangle fluid intercepting area, the pulverized coal particles continuously enter the isosceles triangle fluid intercepting body upwards along the original direction due to the inertia effect, the pulverized coal particles are accelerated to fall downwards due to the loss of the carrying effect of primary air in the fluid intercepting body and simultaneously receive the self gravity effect, and when the fluid intercepting body falls out, the pulverized coal particles fall back to the coal mill at the downward speed overcoming the primary air resistance; thereby the concentration of the coal dust at the outlet of the wind-powder mixture is less than that at the inlet.
The utility model discloses a powder process method does, control system that industrial computer carried receives in the boiler system feedback in the interior flame combustion situation of stove, flue gas flying dust carbon content, NOXAnd CO content information; and comparing with the target value in the control system, and combiningThe pulverized coal concentration detection and pulverized coal flow detection signals and the coal quality condition on each pulverized coal pipeline send instructions to the air-pulverized coal homogenizing coal mill to control the fineness of pulverized coal, and simultaneously send instructions to the pulverized coal concentration regulating valve and the pulverized coal flow regulating valve to regulate the air-pulverized coal state in each pulverized coal pipeline, and a closed-loop control is formed through multiple detections, comparisons and adjustments, so that a boiler system tends to the optimal combustion state.
The coal quality condition (see table I, and the parameter examples of two kinds of coal powder are given) means that different coal quality and coal type have different parameters when entering the plant for detection, the data are stored in the control system, and the industrial personal computer controls the rotating speed of the homogenizing rotor (controls the driving mechanism) and the wind speed (adjusts the adjusting valve in the central wind inlet assembly) according to different coal quality and yield by different strategies.
Table one example of coal quality parameters:
because present powder process system can't realize the meticulous control to the air-powder mixture state, leads to not paying attention to the combustion state of perception boiler, so present powder process system all does not combine together with the boiler organically, can not the automatic perception boiler combustion state. In order to further improve the running economy and safety of the boiler, the powder making system is organically combined with the boiler, the combustion state of the boiler is automatically sensed, and the fine control of the air-powder mixture entering the boiler is realized. Usually, the control process needs multiple iterations to find the optimal state of the adjusting units (the wind powder homogenizing coal mill, the coal powder concentration adjusting valve and the wind powder flow adjusting valve), the industrial personal computer records the adjusting process and the result of each working condition, when the same working condition is met again next time, the multiple iteration process is omitted, each adjusting unit is directly adjusted to the optimal state, and the response speed of the powder making system is improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (9)
1. A powdering system mounted on a boiler system (10), comprising:
a pulverized coal homogenizing mill (20), the pulverized coal homogenizing mill (20) being connected to the boiler system (10) through a plurality of pulverized coal pipes (L); each pulverized coal pipeline (L) is sequentially provided with a pulverized coal concentration regulating valve (30), a pulverized coal flow regulating valve (40), a pulverized coal concentration detection sensor (50) and a pulverized coal flow detection device (60) from the end close to the air-powder homogenizing coal mill (20) to the end of the boiler system (10);
and the industrial personal computer (70), the industrial personal computer (70) is provided with a control system, and the control system is connected with the air-powder homogenizing coal mill (20), the coal powder concentration regulating valve (30), the coal powder flow regulating valve (40), the coal powder concentration detection sensor (50), the coal powder flow detection device (60), and the in-furnace flame detection sensor (11), the flue gas fly ash carbon content detection sensor (12), the flue gas NO, in the boiler system (10)XThe detection sensor (13) is electrically connected with the flue gas CO detection sensor (14).
2. A pulverizer system according to claim 1, wherein the wind-powder homogenizing coal mill (20) comprises:
the coal mill comprises a coal mill shell (21), wherein a discharge hole (211) is formed in the top of the coal mill shell (21), one end of a coal powder pipeline (L) is communicated with the discharge hole (211), and a primary air pipe (22) communicated with the coal mill shell (21) is arranged on the side wall of the bottom of the coal mill shell (21);
the powder conveying assembly (23) penetrates through the center of the top of the coal mill shell (21) and is inserted into the coal mill shell (21) and communicated with the interior of the coal mill shell (21);
the powder grinding assembly (24), the powder grinding assembly (24) is rotatably connected to the bottom of the coal mill shell (21) and is opposite to the powder conveying assembly (23);
the material powder homogenizing assembly (25) comprises a driving mechanism (251) and a homogenizing rotor (252), the driving mechanism (251) is arranged at the top of the coal mill shell (21), the homogenizing rotor (252) is arranged in the coal mill shell (21) and is arranged opposite to the material powder grinding assembly (24), the driving mechanism (251) drives the homogenizing rotor (252) to be rotatably sleeved on the material powder conveying assembly (23), and an air inlet (2521) and an air outlet (2522) are respectively formed in the bottom and the side wall of the homogenizing rotor (252); the driving mechanism (251) is electrically connected with the industrial personal computer (70);
and a central air inlet component (26), wherein one end of the central air inlet component (26) is communicated with the primary air pipe (22), and the other end of the central air inlet component is an air outlet end which is inserted into the coal mill shell (21) in a bent mode and is communicated with the material powder conveying component (23).
3. A powdering system according to claim 2, wherein the central air intake assembly (26) comprises an air intake pipe (261), an air jacket (262) and a regulating valve (263), one end of the air intake pipe (261) is connected to the primary air pipe (22), and the other end is connected to the side wall of the air jacket (262) to form a whole; the air sleeve (262) and one end of the air inlet pipe (261) are bent and inserted into the coal mill shell (21), and the air sleeve (262) is fixedly sleeved at the lower end of the material powder conveying assembly (23); governing valve (263) set up in on air-supply line (261), governing valve (263) with industrial computer (70) electric connection.
4. A powdering system according to claim 2, wherein the homogenizing rotor (252) comprises a central tube (2523), a cone (2524), blades (2525), a bottom ring (2526) and a choke block (2527), and the driving mechanism (251) drives the central tube (2523) to be rotatably sleeved on the powder feeding assembly (23); the cone (2524) comprises an upper plate (25241) and a lower plate (25242), the upper plate (25241) is a circular table with a hole in the middle, the lower plate (25242) is a circular table with a hole in the middle, the upper plate (25241) and the lower plate (25242) are fixedly connected at one side edge of the upper plate and the lower plate, and the upper plate (25241) and the lower plate (25242) are fixedly sleeved outside the central tube (2523); the air-out structure is characterized in that the number of the blades (2525) is multiple, the multiple blades (2525) are uniformly arranged on the same circumferential surface along the side wall of the central tube (2523), the tops of the multiple blades (2525) are fixedly connected to the bottom end surface of the lower plate (25242), the bottom ring (2526) is fixed to the outer side of the lower ends of the multiple blades (2525), an air inlet (2521) is formed in the middle of the bottom ring (2526), multiple air outlets (2522) are formed between the multiple blades (2525) and the lower plate (25242) as well as between the multiple blades (2526), and the air blocking block (2527) is fixed to the air outlet (2522) and used for changing the air outlet direction and the air outlet area of the air outlet (2522).
5. The system of claim 4, wherein the choke blocks (2527) are fixedly filled at the upper inner end of the air outlet (2522) at intervals, and are fixedly connected with the lower plate (25242) and the blades (2525) at two sides, and the difference in area between any two adjacent air outlets (2522) is 10% -25%;
or the air outlets (2522) are 4-6 groups, each group of air outlets (2522) comprises a plurality of adjacent air outlets (2522), the air blocking blocks (2527) are sequentially and fixedly filled at the upper end of the inner side of each group of air outlets (2522), the air blocking blocks (2527) are fixedly connected with the lower plate (25242) and the blades (2525) on the two sides, the height of each group of air outlets (2522) is gradually increased, and the area difference between any two adjacent air outlets (2522) is 10% -25%.
6. A powdering system according to claim 4, characterised in that the homogenising rotor (252) further comprises a plurality of fins (2528), the fins (2528) being multiple, and the fins (2528) being fixed outside the windage block (2527) in an asymmetric and non-uniform circumferential manner.
7. A pulverizing system according to claim 1, wherein each of the pulverized coal concentration adjusting valves (30) comprises:
the coal powder homogenizing coal mill comprises a shell (31), wherein the shell (31) is vertically fixed between a coal powder homogenizing coal mill (20) and a coal powder pipeline (L), the bottom of the shell forms an air-powder mixture inlet, the top of the shell forms an air-powder mixture outlet, and a coal powder concentration adjusting cavity is formed between the air-powder mixture inlet and the air-powder mixture outlet;
the driving part (32) is connected to the side wall of the shell (31), and the driving part (32) is electrically connected with the industrial personal computer (70);
a shaft (33), wherein a bearing seat (311) is arranged on the side wall of the shell (31) in the direction vertical to the driving part (32); one end of the shaft (33) is driven by a driving part (32) to rotate in the bearing seat (311);
and the shaft (33) is provided with two groups of valve plates (34), and the two groups of valve plates (34) are arranged in the coal powder concentration adjusting cavity to form a cut-off area in order to change the cut-off area in the coal powder concentration adjusting cavity.
8. A powdering system according to claim 7, characterized in that the driving portion (32) comprises: a driving motor (321), a screw rod (322), a driving frame (323) and a driving gear (324); the driving motor (321) is fixed on the side surface of the shell (31) through a bracket; the output end of the screw rod is in power connection with the screw rod (322); the driving frame (323) is of a rectangular frame structure, two groups of racks (325) are arranged on two opposite inner walls in the vertical direction in a staggered manner, and two groups of driving gears (324) and two groups of racks (325) are respectively in corresponding meshing transmission; two groups of driving gears (324) are connected with one end of the shaft (33); a threaded hole is formed in the bottom of the driving frame (323), the screw rod (322) is in matched transmission with threads in the threaded hole, and the driving motor (321) is electrically connected with the industrial personal computer (70); the shaft (33) comprises a first shaft rod (331) and a second shaft rod (332), one end of the first shaft rod (331) is integrated with the first valve plate (341), the second shaft rod (332) is in a shaft sleeve shape and hinged to the other end of the first shaft rod (331), the other end of the first shaft rod (331) is connected with a first driving gear (3241), the second shaft rod (332) is integrated with the second valve plate (342), and the end of the second shaft rod is connected with a second driving gear (3242); the first driving gear (3241) and the second driving gear (3242) are respectively meshed with a group of racks (325) so as to drive the first valve plate (341) and the second valve plate (342) to open and close through the first shaft rod (331) and the second shaft rod (332) to change the size of a flow interception area; the first valve plate (341) and the second valve plate (342) have the same length, and form an isosceles triangle in an open state with the shaft (33) as a center.
9. A powdering system according to claim 8, characterized in that the outer walls of said first driving gear (3241) and said second driving gear (3242) each comprise a cylindrical section and a toothed section, said cylindrical section coinciding with the root circle of said toothed section, said cylindrical section accounting for 50-55% of the circumference of said toothed section root circle; the width of each group of the racks (325) is half of the width of the inner wall of the frame of the driving frame (323).
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| CN113760018A (en) * | 2021-09-17 | 2021-12-07 | 芜湖发电有限责任公司 | Power station boiler balanced combustion optimization method based on data driving |
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| CN113760018A (en) * | 2021-09-17 | 2021-12-07 | 芜湖发电有限责任公司 | Power station boiler balanced combustion optimization method based on data driving |
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