CN107420936B - Coal conveying partition board, coal powder mixer and control method of coal conveying partition board and coal powder mixer - Google Patents

Coal conveying partition board, coal powder mixer and control method of coal conveying partition board and coal powder mixer Download PDF

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CN107420936B
CN107420936B CN201710443701.6A CN201710443701A CN107420936B CN 107420936 B CN107420936 B CN 107420936B CN 201710443701 A CN201710443701 A CN 201710443701A CN 107420936 B CN107420936 B CN 107420936B
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coal
fuzzy
fuel
coal conveying
partition board
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CN107420936A (en
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金英爱
梁凯洁
阎玉英
宋志宇
姜薇薇
刘研
李明
江彦
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Jilin University
Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
University of Nottingham
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Jilin University
Electric Power Research Institute of State Grid Jilin Electric Power Co Ltd
University of Nottingham
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/22—Controlling thickness of fuel bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/20—Feeding/conveying devices
    • F23K2203/201—Feeding/conveying devices using pneumatic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2400/00—Pretreatment and supply of gaseous fuel
    • F23K2400/20—Supply line arrangements
    • F23K2400/201—Control devices

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention discloses a coal conveying partition board, which comprises: a partition plate; and a rotary blade rotatably provided on the partition plate. The coal conveying partition board has a simple structure, and can uniformly spread coal dust on the horizontal coal conveying partition board. The invention also provides a control method of the pulverized coal mixer, which is based on PID fuzzy control, so that the rotating speed of the rotating blades on the coal conveying partition plate can be precisely controlled, and the utilization rate of fuel and the boiler efficiency are further improved.

Description

Coal conveying partition board, coal powder mixer and control method of coal conveying partition board and coal powder mixer
Technical Field
The invention relates to a baffle plate and a mixer, in particular to a coal conveying baffle plate, a coal powder mixer and a control method thereof.
Background
At present, most of power plant boilers adopt a middle storage chamber powder making system, coal powder falls onto a horizontal partition plate in a coal powder mixer through a powder feeding machine by a powder discharging pipe, and the coal powder on a coal conveying partition plate is fed into a combustion chamber for combustion by primary air, and the coal powder mixer is a device for mixing the coal powder and air required for combustion.
However, the coal powder falling through the powder discharging pipe is accumulated at the middle part of the horizontal partition plate, the coal powder cannot reach the two sides of the horizontal partition plate, the coal powder cannot be completely and effectively utilized, fuel is wasted, and primary air cannot completely blow the coal powder into the combustion chamber, so that the utilization rate of the fuel and the boiler efficiency are reduced.
Disclosure of Invention
In order to solve the technical problem of fuel accumulation, the invention designs and develops the coal conveying partition board, so that coal dust can be uniformly spread on the horizontal coal conveying partition board.
In order to solve another technical problem of fuel waste caused by fuel accumulation, the invention designs and develops the pulverized coal mixer, which can uniformly spread pulverized coal on a horizontal coal conveying partition plate, so that primary air is promoted to more effectively blow the pulverized coal into a combustion chamber, and the fuel waste is reduced.
Meanwhile, in order to solve the technical problem that the rotating speed of the rotating blades on the coal conveying partition plate is difficult to control, the invention provides the control method of the fuel mixer, the rotating speed of the rotating blades is accurately controlled, and the fuel utilization rate and the boiler efficiency are further improved.
The technical scheme provided by the invention is as follows:
a coal conveying partition, comprising:
a partition plate; and
and the rotating blades are rotatably arranged on the partition plate.
Preferably, the method further comprises:
the rotating head, its even range is fixed on the baffle includes:
a housing;
a stator fixed on the housing;
the bearing is fixed on the stand;
the rotor is sleeved on the bearing;
a ball fixed between the bearing and the rotor such that the rotor rotates relative to the bearing;
an end cap that secures the rotating blade to the bearing;
and the motor is connected with the rotating head and drives the rotating head to rotate.
Preferably, the partition board is provided with a balance hole for balancing the air pressure difference at two sides of the partition board.
Preferably, the rotating blades are composed of three blades spaced apart from each other by an angle of 60 °, and the number of the rotating blades is at least two.
Preferably, the length of the blade is half of the width of the partition board, the distance between the blade and the partition board is 0.5-2.0 cm, and the thickness of the blade is 1.5-3.5 cm.
Accordingly, the present invention provides a pulverized coal mixer comprising: the cylinder, the one end and the bellows intercommunication of cylinder, the other end and combustion chamber intercommunication, the upper portion lateral wall and the whitewashed pipe intercommunication of cylinder, the cylinder with whitewashed pipe intercommunication department below the inside level of cylinder sets up foretell coal conveying baffle.
Preferably, the method further comprises:
the speed sensor is arranged at a primary air inlet of the pulverized coal mixer and is used for detecting the wind speed of primary air;
the rotating speed sensor is arranged on the rotating blade and used for detecting the rotating speed of the rotating blade;
the weight sensor is arranged on the coal conveying partition board and used for detecting the weight of fuel on the coal conveying partition board;
and the controller is connected with the motor, the pressure sensor and the weight sensor and is used for receiving detection data of the pressure sensor and the weight sensor and controlling the rotating speed of the motor.
Correspondingly, the invention also provides a control method of the pulverized coal mixer, which comprises the following steps:
weight m of fuel on the coal conveying partition board s And presetting the weight m of fuel on the coal conveying partition board 0 Weight change Δm and (d)The wind speed v of the primary air is input into the fuzzy controller, and the weight change delta m of the fuel on the coal conveying partition plate and the wind speed v of the primary air are divided into 7 grades;
the fuzzy controller outputs the rotating speed n of the motor, and the output is divided into 7 grades;
the fuzzy domain of the weight change delta m of the fuel on the coal conveying partition board is [ -1,1], and the quantization factor is 1.5; the fuzzy domain of wind speed v of the primary wind is [0,1], and the quantization factor is 30; the fuzzy domain of the rotation speed n of the output motor is [0,1], and the quantization factor is 1200;
the fuzzy set of inputs and outputs is NB, NM, NS,0,PS,PM,PB.
Preferably, the method further comprises a fuzzy PID controller:
ideal weight change of fuel on the coal conveying partition plate input into the ith primary air fuel mixing process
Figure BDA0001320671020000031
And the deviation e and the deviation change rate ec of the actual weight change delta m of the fuel are input into a PID controller to carry out motor rotation speed n error compensation control by outputting the proportional coefficient, the proportional integral coefficient and the differential coefficient of the PID.
It is preferred that the composition of the present invention,
ideal weight change of fuel on the coal conveying partition board
Figure BDA0001320671020000032
The fuzzy universe of deviation e from the actual weight change Deltam of the fuel is [ -1,1]The quantization factor is 1.5; the fuzzy universe of variation rate of deviation ec is [ -2,2]The quantization factor is 1;
the fuzzy domain of the proportional coefficient of the output PID is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the proportional integral coefficient is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the differential coefficient is [ -1,1], its quantization factor is 0.0001;
the deviation e and the deviation change rate ec are divided into 7 grades; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades;
the fuzzy set of inputs and outputs of the fuzzy PID controller is { NB, NM, NS,0,PS,PM,PB }.
The invention has at least the following beneficial effects:
(1) The coal conveying partition plate provided by the invention has a simple structure, and can uniformly spread coal dust on the horizontal coal conveying partition plate.
(2) By adopting the coal conveying separator plate coal powder mixer, coal powder can be uniformly spread on the horizontal coal conveying separator plate, primary air is promoted to blow the coal powder into the combustion chamber more effectively, and fuel waste is reduced.
(3) The control method of the pulverized coal mixer provided by the invention enables the rotating speed of the rotating blades on the coal conveying partition plate to be accurately controlled, and further improves the utilization rate of fuel and the boiler efficiency.
Drawings
Fig. 1 is a schematic structural view of a coal conveying partition plate according to the present invention.
Fig. 2 is a schematic structural view of the coal conveying partition plate according to the present invention.
Fig. 3 is a schematic structural view of the pulverized coal mixer according to the present invention.
FIG. 4 is a schematic diagram of a fuzzy controller and fuzzy PID controller according to the invention.
Fig. 5 is a membership function chart of wind velocity v of input primary wind of the fuzzy controller according to the present invention.
FIG. 6 is a graph of membership function of the weight change Δm of fuel on the input coal separator of the fuzzy controller according to the present invention.
FIG. 7 is a membership function chart of the output motor speed n of the fuzzy controller according to the present invention.
FIG. 8 is a membership function chart of the input bias e of the fuzzy PID controller according to the invention.
Fig. 9 is a membership function graph of the input bias change rate ec of the fuzzy PID controller according to the present invention.
FIG. 10 shows the output scaling factor K of the fuzzy PID controller according to the invention p Membership function graph of (a).
FIG. 11 is a fuzzy P according to the present inventionOutput proportional integral coefficient K of ID controller i Membership function graph of (a).
FIG. 12 shows the differential coefficient K of the output of the fuzzy PID controller according to the invention d Membership function graph of (a).
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed in breadth and scope in accordance with the appended claims. In the drawings, the size and relative sizes of structures and regions may be exaggerated for clarity.
As shown in fig. 1 and 2, the present invention provides a coal conveying partition plate, comprising: a separator 100; and a rotary blade 120 rotatably provided on the partition plate 100. In this embodiment, the device further comprises a rotating head 110 and a motor (not shown in the figure), wherein the rotating head 110 is uniformly arranged and fixed on the partition board 100; the rotary blade 120 is fixed to the rotary head 110. The spin head 110 includes: a casing (not shown in the drawings); a stator (not shown) fixed to the housing; a bearing (not shown) fixed to the housing; a rotor (not shown) which is fitted over the bearing; balls (not shown) fixed between the bearing and the rotor so that the rotor rotates with respect to the bearing; an end cap (not shown) that secures the rotating blades to the bearing. The motor is connected with the rotating head 110, and drives the rotating head to drive the rotating blades 120 to rotate. Because when the rotating blades 120 rotate faster, the pressure difference can be generated between the upper side and the lower side of the partition plate 100, and the pressure on one side of the partition plate with the rotating blades 120 is smaller than the pressure on the other side of the partition plate, the coal conveying partition plate can be unstable and used for a long time, and the service life of the coal conveying partition plate can be reduced, therefore, the partition plate 100 is further provided with the balance holes 130, and the pressure difference on the two sides of the partition plate is balanced, so that the coal conveying partition plate is stably arranged, and the service life of the coal conveying partition plate is prolonged. The balance holes 130 can also reduce excessive axial forces on the bearing during rotation of the rotor. The rotary blades 120 are composed of three blades which are mutually separated by an angle of 60 degrees, the length of each blade is half of the width of the partition plate, the distance between each blade and the partition plate is 0.5-2.0 cm, the thickness of each blade is 1.5-3.5 cm, and the number of the rotary blades is two. It should be understood that the structure of the rotating blades 120 is not limited to the above-described structure, and the number of rotating blades is not limited to 2, as long as it is sufficient to uniformly spread the pulverized coal on the partition plate 100.
The coal conveying partition plate provided by the invention has a simple structure, and can uniformly spread coal dust on the horizontal coal conveying partition plate, so that primary air is promoted to blow the coal dust into the combustion chamber more effectively, and the fuel waste is reduced.
As shown in fig. 3, the present invention also provides a pulverized coal mixer, an apparatus for mixing pulverized coal and air required for combustion, comprising: the cylinder 200, the end a of the cylinder is communicated with an air box (not shown in the figure), the end B of the cylinder is communicated with a combustion chamber (not shown in the figure), the upper side wall of the cylinder is communicated with a powder dropping pipe 210, and one of the coal conveying partition boards is horizontally arranged inside the cylinder 200 below the position where the cylinder 200 is communicated with the powder dropping pipe 210. The coal powder mixer provided by the invention uses the coal conveying partition plate, and further comprises a speed sensor 220, which is arranged at the side of a primary air inlet A of the coal powder mixer and is used for detecting the wind speed of primary air; a rotation speed sensor 240 provided on the rotary blade for detecting a rotation speed of the rotary blade; a weight sensor 230 disposed on the coal conveying partition for detecting the weight of the fuel on the coal conveying partition; a controller (not shown) connected to the motor, the pressure sensor 220 and the weight sensor 230 for receiving detection data of the pressure sensor and the weight sensor and controlling a rotation speed of the motor. The rotary blades 120 on the coal conveying partition plate rotate to grind and scatter the coal dust falling and accumulated on the partition plate 100, the coal dust is evenly spread on the partition plate 100, primary air provided by the air box blows through, the coal dust is blown into the combustion chamber, and the fuel utilization rate is improved. In this embodiment, the included angle α between the central axis of the powder falling tube 210 on the mixer and the central axis of the cylinder 200 is 30-60 °, the included angle is an included angle on the air inlet side, and the direction of the arrow C at the end a of the cylinder 200 is the trend of the wind in the cylinder 200. By reducing the inclination degree of the powder falling pipe 210 to be 30-60 degrees, the pulverized coal can be ensured to smoothly fall from the pulverized coal pipe 210, the speed of the pulverized coal in the vertical direction is reduced under the action of gravity and primary air flow, the contact and action time of the primary air and the pulverized coal are prolonged, the powder carrying capacity of the primary air is enhanced, most of the pulverized coal is mixed with the primary air and then enters a combustion chamber for combustion, and the deposition probability of the pulverized coal is reduced. The distance from the coal conveying partition plate to the inner wall surface of the cylinder 200 above is 0.4-0.7 times, preferably 0.6 times, of the pipe diameter of the cylinder 200, so that coal dust is blown into a combustion chamber to be combusted under the action of primary air with higher utilization rate.
The pulverized coal mixer provided by the invention can enable pulverized coal to be uniformly spread on the horizontal coal conveying partition plate, so that primary air is promoted to more effectively blow the pulverized coal into the combustion chamber, and the fuel waste is reduced.
The invention also provides a control method of the pulverized coal mixer, wherein the wind speed of the primary wind is far greater than the upward wind speed generated by the rotation of the rotary blades, so that the wind power generated by the rotation of the rotary blades is ignored. The control method of the invention is shown in fig. 4, wherein the controller comprises a fuzzy controller and a fuzzy PID controller, and comprises the following steps:
step 1: weight m of fuel on the coal conveying partition board s And presetting the weight m of fuel on the coal conveying partition board 0 Carrying out fuzzy processing on the weight change delta m of the primary wind, the wind speed v of the primary wind and the motor rotating speed n; when the control is not performed, the fuzzy domain of the weight change delta m of the fuel on the coal conveying partition board is [ -1,1]The quantization factor is 1.5; the fuzzy theory domain of the wind speed upsilon of the primary wind is [0,1]]The quantization factor is 30; the fuzzy universe of the rotation speed n of the output motor is [0,1]The quantization factor is 1200; in order to ensure the control precision and realize better control, experiments are repeatedly carried out, and the optimal input and output grades are determined, wherein the weight change delta m of the fuel on the coal conveying partition plate and the wind speed v of the primary wind are divided into 7 grades; outputting the rotating speed n of the motor, wherein the output is divided into 7 grades; the fuzzy sets of input and output are both NB, NM, NS,0,PS,PM,PB. Wherein said at least one ofThe control rule of the fuzzy controller is as follows:
(1) The wind speed v of the primary air is fixed, the weight change delta m of the fuel on the coal conveying partition plate is increased, and the rotating speed n of the motor is required to be increased;
(2) The weight change delta m of the fuel on the coal conveying partition board is fixed, and when the wind speed v of primary wind is increased, the rotating speed n of the motor needs to be reduced;
the specific control rules of the fuzzy control are shown in the table I.
Fuzzy control meter for meter-one motor rotation speed
Figure BDA0001320671020000071
Weight m of fuel on input coal-conveying partition board of fuzzy controller s And presetting the weight m of fuel on the coal conveying partition board 0 The weight change delta m of the primary wind and the wind speed v of the primary wind are used for obtaining the rotating speed n of an output motor of the fuzzy controller by a fuzzy control rule table I, and the rotating speed n of the motor is defuzzified by a gravity center method.
Step 2: fuzzy PID controller
Ideal weight change of fuel on the coal conveying partition plate in the ith primary air fuel mixing process
Figure BDA0001320671020000072
Fuzzy processing of the model of the deviation e, the deviation change rate ec, the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID and the actual weight change delta m of the fuel, and when the model is uncontrolled, the fuzzy argument of the deviation e is [ -1,1]The quantization factor is 1.5; fuzzy universe of variation rate of deviation ec [ -2,2]The quantization factor is 1; proportional coefficient K of PID p The ambiguity domain of (1) is [ -1,1]The quantization factor is 0.1; proportional integral coefficient K i The ambiguity domain of (1) is [ -1,1]The quantization factor is 0.1; differential coefficient K d The ambiguity domain of (1) is [ -1,1]The quantification factor is 0.0001. In order to ensure the control precision and realize better control, experiments are repeatedly carried out, and the optimal input and output levels are determined, wherein the deviation e and the deviation change rate ec in the fuzzy controller are divided into 7 levels; conveying deviceThe proportional coefficient, the proportional integral coefficient and the differential coefficient of the PID are divided into 7 grades; the fuzzy sets of input and output are { NB, NM, NS,0,PS,PM,PB }, and the membership functions of input and output are triangle membership functions, see in detail fig. 5-12. The fuzzy control rule is as follows:
1. when the deviation |e| is large, K is increased p Thereby the deviation is reduced rapidly, but a larger deviation change rate is generated at the same time, a smaller K is adopted d K is usually taken i ＝0；
2. When the values of |ec| and |e| are at medium, K is suitably reduced to avoid overshoot p To take the value of K i Smaller, select K of appropriate size d ；
3. When the deviation |e| is small, K is increased p K i To avoid unstable oscillation around the steady state value of the system, the value of (1) is usually set to be smaller when |ec| is larger d The method comprises the steps of carrying out a first treatment on the surface of the When |ec| is small, a large K is taken d The method comprises the steps of carrying out a first treatment on the surface of the The specific fuzzy control rules are shown in tables II, III and IV.
Table II proportional coefficient K of PID p Fuzzy control table of (a)
Figure BDA0001320671020000081
Table three PID proportional integral coefficient K i Fuzzy control table of (a)
Figure BDA0001320671020000082
Differential coefficient K of Table four PID d Fuzzy control table of (a)
Figure BDA0001320671020000091
Ideal weight change of fuel on the coal conveying partition plate input into the ith primary air fuel mixing process
Figure BDA0001320671020000092
And the deviation e and the deviation change rate ec of the actual weight change delta m of the fuel, outputting the proportional coefficient, the proportional integral coefficient and the differential coefficient of the PID, performing defuzzification on the proportional coefficient, the proportional integral coefficient and the differential coefficient by a height method, inputting the defuzzification into a PID controller for performing motor rotation speed n error compensation control, wherein the control formula is as follows:
Figure BDA0001320671020000093
experiments repeatedly determine that the fuzzy PID controller accurately controls the motor rotating speed n, wherein the motor rotating speed n is the sum of the output rotating speed of the fuzzy controller and the rotating speed error compensation value of the PID controller, so that the pulverized coal mixer accurately controls the rotating speed of the rotating blades on the coal conveying partition plate, and the deviation is smaller than 0.1%.
The invention provides a control method of a pulverized coal mixer, which enables the rotating speed of a rotating blade on a coal conveying partition plate to be accurately controlled, and further improves the utilization rate of fuel and the efficiency of a boiler.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (5)

1. A pulverized coal mixer, comprising: the device comprises a cylinder body, a combustion chamber, a powder falling pipe, a powder feeding baffle, a powder feeding pipe, a gas box and a gas box, wherein one end of the cylinder body is communicated with the gas box, the other end of the cylinder body is communicated with the combustion chamber, the side wall of the upper part of the cylinder body is communicated with the powder falling pipe, and the coal feeding baffle is horizontally arranged in the cylinder body below the communication position of the cylinder body and the powder falling pipe;
wherein, the coal conveying partition plate includes:
a partition plate; and
and the rotating blades are rotatably arranged on the partition plate.
2. The pulverized coal mixer as set forth in claim 1, further comprising:
the speed sensor is arranged at a primary air inlet of the pulverized coal mixer and is used for detecting the wind speed of primary air;
the rotating speed sensor is arranged on the rotating blade and used for detecting the rotating speed of the rotating blade;
the weight sensor is arranged on the coal conveying partition board and used for detecting the weight of fuel on the coal conveying partition board;
and the controller is connected with the motor, the pressure sensor and the weight sensor and is used for receiving detection data of the pressure sensor and the weight sensor and controlling the rotating speed of the motor.
3. A control method of a pulverized coal mixer using the pulverized coal mixer according to any one of claims 1 to 2, characterized by comprising:
weight m of fuel on the coal conveying partition board s And presetting the weight m of fuel on the coal conveying partition board 0 The weight change delta m of the fuel on the coal conveying partition plate and the wind speed v of the primary wind are divided into 7 grades;
the fuzzy controller outputs the rotating speed n of the motor, and the output is divided into 7 grades;
the fuzzy domain of the weight change delta m of the fuel on the coal conveying partition board is [ -1,1], and the quantization factor is 1.5; the fuzzy domain of wind speed v of the primary wind is [0,1], and the quantization factor is 30; the fuzzy domain of the rotation speed n of the output motor is [0,1], and the quantization factor is 1200;
the fuzzy set of inputs and outputs is NB, NM, NS,0,PS,PM,PB.
4. A method of controlling a pulverized coal mixer according to claim 3, further comprising a fuzzy PID controller:
inputting ideal weight of fuel on the coal conveying partition plate of the ith primary air fuel mixing processVariation Deltam si And the deviation e and the deviation change rate ec of the actual weight change delta m of the fuel are input into a PID controller to carry out motor rotation speed n error compensation control by outputting the proportional coefficient, the proportional integral coefficient and the differential coefficient of the PID.
5. The method for controlling a pulverized coal mixer according to claim 4, wherein,
ideal weight change delta m of fuel on the coal conveying partition board si The fuzzy universe of deviation e from the actual weight change Deltam of the fuel is [ -1,1]The quantization factor is 1.5; the fuzzy universe of variation rate of deviation ec is [ -2,2]The quantization factor is 1;
the fuzzy domain of the proportional coefficient of the output PID is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the proportional integral coefficient is [ -1,1], and the quantization factor is 0.1; the fuzzy argument of the differential coefficient is [ -1,1], its quantization factor is 0.0001;
the deviation e and the deviation change rate ec are divided into 7 grades; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades;
the fuzzy set of inputs and outputs of the fuzzy PID controller is { NB, NM, NS,0,PS,PM,PB }.
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CN105854659A (en) * 2016-04-08 2016-08-17 大唐安阳发电厂 Air-conveying powdered coal mixer
CN206875471U (en) * 2017-06-13 2018-01-12 吉林大学 A kind of defeated coal dividing plate and coal, pulverulent fuel mixer

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CN1528866A (en) * 2003-10-15 2004-09-15 王逢旦 Apparatus for producing coal-water fluid or oil-coal fluid and production method thereof
CN105854659A (en) * 2016-04-08 2016-08-17 大唐安阳发电厂 Air-conveying powdered coal mixer
CN206875471U (en) * 2017-06-13 2018-01-12 吉林大学 A kind of defeated coal dividing plate and coal, pulverulent fuel mixer

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