CN113477389A - Control method and device of powder making system - Google Patents
Control method and device of powder making system Download PDFInfo
- Publication number
- CN113477389A CN113477389A CN202110653167.8A CN202110653167A CN113477389A CN 113477389 A CN113477389 A CN 113477389A CN 202110653167 A CN202110653167 A CN 202110653167A CN 113477389 A CN113477389 A CN 113477389A
- Authority
- CN
- China
- Prior art keywords
- coal
- operation mode
- powder
- air quantity
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/04—Safety devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a control method and a device of a powdering system, wherein the method comprises the following steps: determining the current operation mode of the coal mill according to the opening number of the outlet door; determining an allowable switching mode of the coal mill according to the current operation mode, the allowable change value and the allowable minimum value of the starting number; if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, switching the coal mill from the current operation mode to a target operation mode corresponding to the target switching mode; the opening number of the outlet doors of the coal mill is changed, the running mode of the coal mill is changed, and the coal powder concentration of the residual coal powder pipes can be improved based on the closing of the outlet doors of the coal mill with different numbers, so that the flexibility of coal quantity control of the coal pulverizing system during deep peak shaving is improved on the basis of ensuring the safety of the unit.
Description
Technical Field
The application relates to the technical field of thermal power plants, in particular to a control method and device of a powder making system.
Background
With the clean reformation of an energy structure, the installed capacity of new energy power stations such as wind power stations and photovoltaic stations is rapidly increased, however, the new energy has the characteristics of randomness, intermittence, instability and the like, and the continuous and rapid development of the installed capacity of the new energy power stations has adverse effects on peak shaving of a power grid, so that the phenomenon of wind abandoning and light abandoning is serious. Aiming at the problem of new energy consumption, the national energy agency provides full excavation of the peak regulation capability of the existing system, and enhances the flexibility and adaptability of the system. And (3) issuing an electric power peak regulation auxiliary service market operation rule for each regional power grid, making a relevant peak regulation subsidy policy, and guiding the coal-fired thermal power generating unit to improve the operation flexibility by reward and punishment means.
At present, the main factors limiting the deep peak shaving downward exploration of the coal-fired unit are poor stable combustion and poor fire detection at low load of a boiler. For example, when a power plant unit runs in a double-grinding mode, the phenomenon of flicker and disappearance of fire detection often occurs when the total coal quantity is lower than 60t/h (the single-grinding coal quantity is lower than 30t/h), the phenomenon is caused by the fact that the flame of a burner is observed to be black dragon on the spot, the total fuel quantity is low during deep peak shaving, and the coal powder concentration of each burner is low.
Therefore, how to improve the flexibility of coal quantity control of the pulverizing system during deep peak shaving on the basis of ensuring the safety of the unit is a technical problem to be solved urgently at present.
Disclosure of Invention
The invention provides a control method of a powder making system, which is used for solving the technical problem of poor combustion stability of a boiler caused by too low coal amount during deep peak regulation in the prior art, and is applied to the powder making system comprising a coal feeder and a coal mill, wherein the coal mill comprises a plurality of powder outlet pipes for conveying coal powder to a boiler burner, and each powder outlet pipe is provided with an outlet door for controlling the on-off of the powder outlet pipe, and the method comprises the following steps:
determining the current operation mode of the coal mill according to the opening number of the outlet door;
determining an allowable switching mode of the coal mill according to the current operation mode, the allowable change value and the allowable minimum value of the starting number;
if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, switching the coal mill from the current operation mode to a target operation mode corresponding to the target switching mode;
wherein the number of firing is different in the current operating mode and in the target operating mode.
Preferably, the allowable change value is one, and the allowable minimum value is half of the number of the powder tubes.
Preferably, the number of the powder outlet pipes is six, and the current operation mode of the coal mill is determined according to the opening number of the outlet doors, specifically:
if the starting number is six, the current operation mode is a six-powder-tube operation mode;
if the starting number is five, the current operation mode is a five-powder-tube operation mode;
if the number of the opening is four, the current operation mode is a four-powder-tube operation mode;
and if the starting number is three, the current operation mode is a three-powder-tube operation mode.
Preferably, the method for determining the allowable switching mode of the coal pulverizer according to the current operation mode, the allowable change value of the number of the switches and the allowable minimum value includes:
if the current operation mode is the six powder tube operation mode, the allowable switching mode is to be switched from the six powder tube operation mode to the five powder tube operation mode;
if the current operation mode is the five powder tube operation mode, the allowable switching mode is to switch the five powder tube operation mode to the six powder tube operation mode, or to switch the five powder tube operation mode to the four powder tube operation mode;
if the current operation mode is the four powder tube operation mode, the allowable switching mode is to switch the four powder tube operation mode to the five powder tube operation mode, or to switch the four powder tube operation mode to the three powder tube operation mode;
and if the current operation mode is the three powder tube operation mode, the allowable switching mode is to switch the three powder tube operation mode into the four powder tube operation mode.
Preferably, the first and second liquid crystal materials are,
if the target switching mode is to switch the operation mode of the six powder tubes to the operation mode of the five powder tubes, the target permission condition is a first permission condition, and the first permission condition includes: the coal quantity of the coal mill is not less than a first coal quantity and not more than a second coal quantity, the air quantity of the coal mill is not less than a first air quantity and not more than a second air quantity, and the opening quantity is five;
if the target switching mode is to switch the five powder tube operation mode to the four powder tube operation mode, the target permission condition is a second permission condition, and the second permission condition includes: the coal quantity is not less than a third coal quantity and not more than a fourth coal quantity, the air quantity is not less than a third air quantity and not more than a fourth air quantity, the opening quantity is four, the third coal quantity is less than the first coal quantity, the fourth coal quantity is less than the second coal quantity, the third air quantity is less than the first air quantity, and the fourth air quantity is less than the second air quantity;
if the target switching mode is to switch the four powder tube operation mode to the three powder tube operation mode, the target permission condition is a third permission condition, and the third permission condition includes: the coal quantity is not less than a fifth coal quantity and not more than a sixth coal quantity, the air quantity is not less than a fifth air quantity and not more than a sixth air quantity, the opening quantity is three, the fifth coal quantity is less than the third coal quantity, the sixth coal quantity is less than the fourth coal quantity, the fifth air quantity is less than the third air quantity, and the sixth air quantity is less than the fourth air quantity;
if the target switching mode is to switch the three powder tube operation mode to the four powder tube operation mode, the target permission condition is the second permission condition;
if the target switching mode is to switch the four powder tube operation mode to the five powder tube operation mode, the target permission condition is the first permission condition;
if the target switching mode is to switch the five powder tube operation mode to the six powder tube operation mode, the target permission condition is a fourth permission condition, and the fourth permission condition includes: the coal quantity is larger than a seventh coal quantity, the air quantity is larger than a seventh air quantity, the opening quantity is six, the seventh coal quantity is larger than the first coal quantity and smaller than the second coal quantity, and the seventh air quantity is larger than the first air quantity and smaller than the second air quantity.
Preferably, the first and second liquid crystal materials are,
the control logic of the five powder tube operation modes comprises: the coal quantity is not less than the first coal quantity and not more than the second coal quantity, the wind coal curve meets a first curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are first upper and lower limits, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is five out of six, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than a first threshold value, the condition that the primary air quantity low protection tripping of the coal mill is that the air quantity is lower than a second threshold value and a preset time length is delayed, the condition that the primary air quantity low protection tripping of the coal feeder is that the air quantity is lower than the first threshold value and the preset time length is delayed, and the first threshold value is larger than the second threshold value;
the control logic of the four powder tube operation modes comprises the following steps: the coal quantity is not less than the third coal quantity and not more than the fourth coal quantity, the wind coal curve meets a second curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are the first upper limit and the first lower limit, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is five out of six, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than the third threshold, the condition of primary air quantity low protection tripping of the coal mill is that the air quantity is lower than the fourth threshold and the preset time length is delayed, the condition of primary air quantity low protection tripping of the coal feeder is that the air quantity is lower than the third threshold and the preset time length is delayed, the third threshold is larger than the fourth threshold and smaller than the first threshold, and the fourth threshold is smaller than the second threshold;
the control logic of the operation modes of the three powder tubes comprises the following steps: the coal quantity is not less than the fifth coal quantity and not more than the sixth coal quantity, the wind coal curve meets a third curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are the first upper limit and the first lower limit, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is six to five, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than the fifth threshold, the condition that the primary air quantity of the coal mill is low to protect tripping operation is that the air quantity is lower than the sixth threshold and delay the preset duration, the condition that the primary air quantity of the coal feeder is low to protect tripping operation is that the air quantity is lower than the fifth threshold and delay the preset duration, the fifth threshold is greater than the sixth threshold and smaller than the third threshold, and the sixth threshold is smaller than the fourth threshold.
Preferably, the first curve is determined according to a first formula, and the first formula specifically is: 0.7029M +57.44, the second curve being determined according to a second formula, the second formula being in particular: 0.8278M +44.2, the third curve being determined according to a third formula, the third formula being in particular: and F is 0.8286M +34.3, wherein F is the air volume and M is the coal volume.
Correspondingly, the invention also provides a control device of the powder making system, which is applied to the powder making system comprising a coal feeder and a coal mill, wherein the coal mill comprises a plurality of powder outlet pipes for conveying coal powder to a boiler burner, each powder outlet pipe is provided with an outlet door for controlling the on-off of the powder outlet pipe, and the device comprises:
the first determining module is used for determining the current operation mode of the coal mill according to the opening number of the outlet door;
the second determining module is used for determining an allowable switching mode of the coal mill according to the current operation mode, the allowable change value and the allowable lowest value of the opening number;
the switching module is used for switching the coal mill from the current operation mode to a target operation mode corresponding to a target switching mode if a switching instruction for the target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode;
wherein the number of firing is different in the current operating mode and in the target operating mode.
Preferably, the allowable change value is one, and the allowable minimum value is half of the number of the powder tubes.
Correspondingly, the present invention further provides a computer-readable storage medium, where instructions are stored, and when the instructions are run on a terminal device, the terminal device is caused to execute the above control method for a powder process system.
Compared with the prior art, the invention has the following beneficial effects:
by applying the technical scheme, in a coal pulverizing system comprising a coal feeder and a coal pulverizer, the coal pulverizer comprises a plurality of powder outlet pipes for conveying coal powder to a boiler burner, each powder outlet pipe is provided with an outlet door for controlling the on-off of the powder outlet pipe, and the current operation mode of the coal pulverizer is determined according to the opening number of the outlet doors; determining an allowable switching mode of the coal mill according to the current operation mode, the allowable change value and the allowable minimum value of the starting number; if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, switching the coal mill from the current operation mode to a target operation mode corresponding to the target switching mode; the opening number is different between the current operation mode and the target operation mode, the operation mode of the coal mill is changed by changing the opening number of the outlet doors of the coal mill, the coal powder concentration of the residual coal powder pipes can be improved based on closing of the outlet doors of the coal mill with different numbers, and the fuel quantity of the boiler is further reduced during the deep peak shaving of the unit, so that the deep shaving amplitude of the unit is not limited by the minimum coal quantity of the boiler any more, the flexibility of coal quantity control of the coal pulverizing system during the deep peak shaving is improved on the basis of ensuring the safety of the unit, and the deep peak shaving capacity of the unit is enhanced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a control method of a pulverizing system according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a control device of a pulverizing system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the invention provides a control method of a powder making system, which is applied to a powder making system comprising a coal feeder and a coal mill, wherein the coal mill comprises a plurality of powder outlet pipes for conveying coal powder to a boiler burner, and each powder outlet pipe is provided with an outlet door for controlling the on-off of the powder outlet pipe, as shown in figure 1, the method comprises the following steps:
and S101, determining the current operation mode of the coal mill according to the opening number of the outlet door.
In this embodiment, the coal pulverizing system may be a positive pressure direct-fired coal pulverizing system, including a coal feeder and a coal pulverizer, the coal pulverizer includes a plurality of powder outlet pipes for conveying pulverized coal to a boiler burner, each of the powder outlet pipes is provided with an outlet door for controlling the on-off of the powder outlet pipe, each of the powder outlet pipes is correspondingly connected with a burner disposed in the boiler, the burner may be an opposed swirl burner or a wall-type garden-cutting burner, and each burner has an ability to organize stable combustion individually. The coal feeder feeds coal to the coal mill, and the coal mill grinds the coal and conveys coal powder to each coal powder pipeline through a coal powder separator by primary air, and the coal powder enters each combustor through each outlet door for combustion.
The coal mill is in different operation modes by changing the opening number of the outlet door, so that the current operation mode can be determined according to the opening number.
And step S102, determining an allowable switching mode of the coal pulverizer according to the current operation mode, the allowable change value and the allowable lowest value of the opening number.
In this embodiment, different operation modes correspond to different opening numbers, and each outlet door needs to be controlled according to the allowable change value and the allowable minimum value of the opening number, so that the allowable switching mode for switching from the current operation mode to another operation mode can be determined according to the current operation mode, the allowable change value and the allowable minimum value of the opening number.
In order to improve the safety of the unit, in the preferred embodiment of the present application, the allowable change value is one, and the allowable minimum value is half of the number of the powder tubes.
In this embodiment, the allowable change value is one, that is, the number of the coal pulverizer is increased by one or decreased by one according to different conditions, and meanwhile, the number of the coal pulverizer is not less than half of the number of the coal pulverizer to be ensured, because if the number of the coal pulverizer is too low, the normal operation of the coal pulverizer is affected, and further the combustion stability of the boiler is affected.
In order to accurately determine the current operation mode, in a preferred embodiment of the present application, the number of the powder outlet pipes is six, and the current operation mode of the coal mill is determined according to the opening number of the outlet door, specifically:
if the starting number is six, the current operation mode is a six-powder-tube operation mode;
if the starting number is five, the current operation mode is a five-powder-tube operation mode;
if the number of the opening is four, the current operation mode is a four-powder-tube operation mode;
and if the starting number is three, the current operation mode is a three-powder-tube operation mode.
The person skilled in the art may also choose to use a coal mill with other numbers of powder outlet pipes, and determine different current operation modes according to different opening numbers, which does not affect the scope of the present application.
In order to reliably determine the allowable switching mode, in a preferred embodiment of the present application, the allowable switching mode of the coal pulverizer is determined according to the current operation mode, the allowable change value of the number of the switches, and the allowable minimum value, specifically:
if the current operation mode is the six powder tube operation mode, the allowable switching mode is to be switched from the six powder tube operation mode to the five powder tube operation mode;
if the current operation mode is the five powder tube operation mode, the allowable switching mode is to switch the five powder tube operation mode to the six powder tube operation mode, or to switch the five powder tube operation mode to the four powder tube operation mode;
if the current operation mode is the four powder tube operation mode, the allowable switching mode is to switch the four powder tube operation mode to the five powder tube operation mode, or to switch the four powder tube operation mode to the three powder tube operation mode;
and if the current operation mode is the three powder tube operation mode, the allowable switching mode is to switch the three powder tube operation mode into the four powder tube operation mode.
In this embodiment, if the current operation mode is the six powder tube operation mode, since all the six outlet doors are opened, the opening number can only be reduced, the allowable change value of the opening number is one, and the opening number after the change is five, which satisfies the allowable lowest value of three of the opening number, so that the allowable switching mode is switched from the six powder tube operation mode to the five powder tube operation mode.
If the current operation mode is a five-powder-tube operation mode, the opening number can be increased or decreased, the allowable change value of the opening number is one, the opening number after the change is six or four, the allowable lowest value three of the opening number is met, and the allowable switching mode is to switch from the five-powder-tube operation mode to a six-powder-tube operation mode or from the five-powder-tube operation mode to a four-powder-tube operation mode.
The determination method of other allowable switching methods is similar to the above determination process, and is not described herein again.
Step S103, if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, switching the coal mill from the current operation mode to a target operation mode corresponding to the target switching mode.
In this embodiment, one or more mode switching buttons corresponding to different target switching modes may be set on the DCS operation interface, an operator inputs a switching instruction for the target switching mode by clicking the mode switching button, and if the target switching mode belongs to the allowable switching mode and the coal mill meets a target allowable condition corresponding to the target switching mode, the coal mill is switched from the current operation mode to the target operation mode corresponding to the target switching mode. The switching of the operation modes is performed by changing the opening number of the outlet door, which is different in the current operation mode and in the target operation mode.
The person skilled in the art can flexibly set different target allowable conditions according to the actual unit parameters, which does not affect the scope of protection of the present application.
In order to reliably perform mode switching, in a preferred embodiment of the present application, if the target switching manner is to switch the six powder tube operation mode to the five powder tube operation mode, the target permission condition is a first permission condition, where the first permission condition includes: the coal quantity of the coal mill is not less than a first coal quantity and not more than a second coal quantity, the air quantity of the coal mill is not less than a first air quantity and not more than a second air quantity, and the opening quantity is five;
if the target switching mode is to switch the five powder tube operation mode to the four powder tube operation mode, the target permission condition is a second permission condition, and the second permission condition includes: the coal quantity is not less than a third coal quantity and not more than a fourth coal quantity, the air quantity is not less than a third air quantity and not more than a fourth air quantity, the opening quantity is four, the third coal quantity is less than the first coal quantity, the fourth coal quantity is less than the second coal quantity, the third air quantity is less than the first air quantity, and the fourth air quantity is less than the second air quantity;
if the target switching mode is to switch the four powder tube operation mode to the three powder tube operation mode, the target permission condition is a third permission condition, and the third permission condition includes: the coal quantity is not less than a fifth coal quantity and not more than a sixth coal quantity, the air quantity is not less than a fifth air quantity and not more than a sixth air quantity, the opening quantity is three, the fifth coal quantity is less than the third coal quantity, the sixth coal quantity is less than the fourth coal quantity, the fifth air quantity is less than the third air quantity, and the sixth air quantity is less than the fourth air quantity;
if the target switching mode is to switch the three powder tube operation mode to the four powder tube operation mode, the target permission condition is the second permission condition;
if the target switching mode is to switch the four powder tube operation mode to the five powder tube operation mode, the target permission condition is the first permission condition;
if the target switching mode is to switch the five powder tube operation mode to the six powder tube operation mode, the target permission condition is a fourth permission condition, and the fourth permission condition includes: the coal quantity is larger than a seventh coal quantity, the air quantity is larger than a seventh air quantity, the opening quantity is six, the seventh coal quantity is larger than the first coal quantity and smaller than the second coal quantity, and the seventh air quantity is larger than the first air quantity and smaller than the second air quantity.
In order to further improve the reliability of the mode switching, in a preferred embodiment of the present application, the first coal amount is 23.5(t/h), the second coal amount is 35(t/h), the third coal amount is 18(t/h), the fourth coal amount is 30(t/h), the fifth coal amount is 14(t/h), the sixth coal amount is 21(t/h), the seventh coal amount is 25(t/h), the first air volume is 73.3(t/h), the second air volume is 86.5(t/h), the third air volume is 58.7(t/h), the fourth air volume is 69.2(t/h), the fifth air volume is 44(t/h), the sixth air volume is 51.9(t/h), and the seventh air volume is 80 (t/h).
In order to improve the safety of each operation mode, in a preferred embodiment of the present application, the control logic of the five powder tube operation modes includes: the coal quantity is not less than the first coal quantity and not more than the second coal quantity, the wind coal curve meets a first curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are first upper and lower limits, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is five out of six, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than a first threshold value, the condition that the primary air quantity low protection tripping of the coal mill is that the air quantity is lower than a second threshold value and a preset time length is delayed, the condition that the primary air quantity low protection tripping of the coal feeder is that the air quantity is lower than the first threshold value and the preset time length is delayed, and the first threshold value is larger than the second threshold value;
the control logic of the four powder tube operation modes comprises the following steps: the coal quantity is not less than the third coal quantity and not more than the fourth coal quantity, the wind coal curve meets a second curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are the first upper limit and the first lower limit, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is five out of six, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than the third threshold, the condition of primary air quantity low protection tripping of the coal mill is that the air quantity is lower than the fourth threshold and the preset time length is delayed, the condition of primary air quantity low protection tripping of the coal feeder is that the air quantity is lower than the third threshold and the preset time length is delayed, the third threshold is larger than the fourth threshold and smaller than the first threshold, and the fourth threshold is smaller than the second threshold;
the control logic of the operation modes of the three powder tubes comprises the following steps: the coal quantity is not less than the fifth coal quantity and not more than the sixth coal quantity, the wind coal curve meets a third curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are the first upper limit and the first lower limit, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is six to five, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than the fifth threshold, the condition that the primary air quantity of the coal mill is low to protect tripping operation is that the air quantity is lower than the sixth threshold and delay the preset duration, the condition that the primary air quantity of the coal feeder is low to protect tripping operation is that the air quantity is lower than the fifth threshold and delay the preset duration, the fifth threshold is greater than the sixth threshold and smaller than the third threshold, and the sixth threshold is smaller than the fourth threshold.
In this embodiment, the wind coal curve is a curve representing a corresponding relationship between the air volume and the coal volume of the coal mill, and the fire detection protection is a fire detection protection action in which six is taken as five, that is, five of six detection points detect that the fire detection is lost.
In order to further improve the safety of each operation mode, in a preferred embodiment of the present application, the first upper and lower limits are ± 10, the first threshold is 55(t/h), the second threshold is 50(t/h), the third threshold is 45(t/h), the fourth threshold is 40(t/h), the fifth threshold is 35(t/h), the sixth threshold is 30(t/h), and the preset time duration is 60 s.
In order to further improve the safety of each operation mode, in a preferred embodiment of the present application, the first curve is determined according to a first formula, where the first formula specifically is: 0.7029M +57.44, the second curve being determined according to a second formula, the second formula being in particular: 0.8278M +44.2, the third curve being determined according to a third formula, the third formula being in particular: and F is 0.8286M +34.3, wherein F is the air volume and M is the coal volume.
The opening number of the outlet doors of the coal mills is changed, the operation mode of the coal mills is changed, the pulverized coal concentration of the residual pulverized coal pipes can be improved based on the closing of the outlet doors of the coal mills with different numbers, the fuel quantity of the boiler can be further reduced during the deep peak shaving of the unit, so that the deep shaving amplitude of the unit is not limited by the minimum coal quantity of the boiler any more, the flexibility of coal quantity control of a coal pulverizing system during the deep peak shaving is improved on the basis of ensuring the safety of the unit, and the deep peak shaving capacity of the unit is enhanced.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
Each coal mill of a certain power plant unit is provided with 6 independent outlet doors corresponding to 6 opposed swirl burners, and each burner has the capability of independently organizing stable combustion. In the embodiment, under the condition that the conditions such as primary air speed of a single pulverized coal pipe, air-coal ratio of a coal mill and the like meet requirements, the pulverized coal concentration of the residual pulverized coal pipe is improved by reducing the primary air quantity of the coal mill and closing 1 to 3 coal mill outlet doors.
The specific control logic is as follows:
1. the normal mode (namely, six powder pipe operation modes) operation of the coal mill is switched to the allowable condition of five powder pipe operation modes:
(1) coal quantity: 23.5(t/h) -35 (t/h);
(2) air volume: 73.3(t/h) -86.5(t/h)
(3) The opening quantity of outlet doors of the coal mill: 5 pieces of the Chinese herbal medicines.
2. Five powder tube operation mode control logics:
(1) coal quantity interval: 23.5(t/h) -35 (t/h);
(2) wind coal curve: the air volume (t/h) is 0.7029 coal volume (t/h) + 57.44;
(3) the upper limit and the lower limit of the command deviation of the coal feeder are changed from +/-5 to +/-10;
(4) the logic of closing and jumping the coal mill at the outlet door of the coal mill is cancelled;
(5) fire detection protection: 6, taking 5;
(6) alarming for low primary air quantity of the coal mill: 55 (t/h);
(7) low protection tripping of primary air quantity of the coal mill: 50(t/h) and 60s delay.
(8) The primary air quantity low protection tripping of the coal feeder: 55(t/h) and 60s delay.
3. The operation mode of the five powder tubes is switched to the allowable conditions of the operation mode of the four powder tubes:
(1) coal quantity: 18(t/h) -30 (t/h);
(2) air volume: 58.7(t/h) -69.2(t/h)
(3) The opening quantity of outlet doors of the coal mill: 4, the number of the channels is 4;
4. four powder tube operation mode control logics:
(1) coal quantity interval: 18(t/h) -30 (t/h);
(2) wind coal curve: the air volume (t/h) is 0.8278 coal volume (t/h) + 44.2;
(3) the upper limit and the lower limit of the command deviation of the coal feeder are changed from +/-5 to +/-10;
(4) the logic of closing and jumping the coal mill at the outlet door of the coal mill is cancelled;
(5) fire detection protection: 6, taking 5;
(6) primary air volume is low and alarming is carried out: 45 (t/h);
(7) primary air quantity low protection tripping: 40(t/h) and 60s delay.
(8) The primary air quantity low protection tripping of the coal feeder: 45(t/h) and 60s delay.
5. The operation mode of the four powder tubes is switched to the allowable condition of the operation mode of the three powder tubes:
(1) coal quantity: 14(t/h) -21 (t/h);
(2) air volume: 44(t/h) -51.9 (t/h);
(3) the opening quantity of outlet doors of the coal mill: 3, the number of the medicine is less than that of the medicine.
6. Control logic of three powder tube operation modes:
(1) coal quantity interval: 14(t/h) -21 (t/h);
(2) wind coal curve: the air volume (t/h) is 0.8286 coal volume (t/h) + 34.3;
(3) the upper limit and the lower limit of the command deviation of the coal feeder are changed from +/-5 to +/-10;
(4) the logic of closing and jumping the coal mill at the outlet door of the coal mill is cancelled;
(5) fire detection protection: 6, taking 5;
(6) primary air volume is low and alarming is carried out: 35 (t/h);
(7) primary air quantity low protection tripping: 30(t/h) and 60s delay.
(8) The primary air quantity low protection tripping of the coal feeder: 35(t/h) and 60s delay.
7. The operation mode of the three powder tubes is switched to the allowable condition of the operation mode of the four powder tubes:
(1) coal quantity: 18(t/h) - -30 (t/h);
(2) air volume: 58.7(t/h) -69.2 (t/h);
(3) the opening quantity of outlet doors of the coal mill: 4 of the Chinese herbal medicines.
8. The operation mode of the four powder tubes is switched to the allowable conditions of the operation mode of the five powder tubes:
(1) coal quantity: 23.5(t/h) - -35 (t/h);
(2) air volume: 73.3(t/h) - -86.5 (t/h);
(3) the opening quantity of outlet doors of the coal mill: 5 pieces of the Chinese herbal medicines.
9. The operation mode of the five powder tubes is switched to the allowable condition of the operation mode of the six powder tubes:
(1) coal quantity: greater than 25 (t/h);
(2) air volume: greater than 80 (t/h);
(3) the opening quantity of outlet doors of the coal mill: 6 pieces of the Chinese herbal medicines are used.
During the deep peak regulation period of the #3 unit of the power plant, a small coal quantity mode (comprising five powder pipe operation modes, four powder pipe operation modes and three powder pipe operation modes) of a 3B coal mill is operated in a trial mode, the coal quantity of the 3B coal mill is successfully reduced to 20t/h, the total coal quantity of the unit is reduced to 45t/h, the load of the unit is reduced to 80MW, and the load of the unit is reduced by 10MW compared with that of a #4 unit.
The low coal quantity operation mode of the coal mill can successfully reduce the lower limit of the coal quantity of the coal mill, so that the total coal quantity of the unit is reduced, and the deep peak regulation capacity of the unit is enhanced. And 2 pulverized coal pipes are closed by 1 coal mill, so that the 10MW load of the unit can be reduced. If two coal mills of a single unit operate in a small coal quantity mode, 20MW load of the unit can be reduced, and the deep adjustment in non-heating seasons can be more profitable by 10000 yuan per hour.
Corresponding to the control method of the powder making system in the embodiment of the present application, the embodiment of the present application further provides a control device of the powder making system, which is applied to a powder making system including a coal feeder and a coal pulverizer, where the coal pulverizer includes a plurality of powder outlet pipes for conveying pulverized coal to a boiler burner, and each of the powder outlet pipes is provided with an outlet door for controlling the on-off of the powder outlet pipe, as shown in fig. 2, the device includes:
a first determining module 201, configured to determine a current operation mode of the coal mill according to the opening number of the outlet door;
a second determining module 202, configured to determine, according to the current operation mode and the allowed change value and the allowed minimum value of the number of switches, an allowed switching manner of the coal pulverizer;
a switching module 203, configured to switch the coal mill from the current operation mode to a target operation mode corresponding to a target switching manner if a switching instruction for the target switching manner is detected, the target switching manner belongs to the allowed switching manner, and the coal mill meets a target allowed condition corresponding to the target switching manner;
wherein the number of firing is different in the current operating mode and in the target operating mode.
In a specific application scenario of the present application, the allowable change value is one, and the allowable minimum value is half of the number of the powder tubes.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. The control method of the powder making system is applied to the powder making system comprising a coal feeder and a coal mill, wherein the coal mill comprises a plurality of powder outlet pipes for conveying coal powder to a boiler burner, and each powder outlet pipe is provided with an outlet door for controlling the on-off of the powder outlet pipe, and the method is characterized by comprising the following steps of:
determining the current operation mode of the coal mill according to the opening number of the outlet door;
determining an allowable switching mode of the coal mill according to the current operation mode, the allowable change value and the allowable minimum value of the starting number;
if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, switching the coal mill from the current operation mode to a target operation mode corresponding to the target switching mode;
wherein the number of firing is different in the current operating mode and in the target operating mode.
2. The method of claim 1, wherein the allowable change value is one, and the allowable minimum value is half of the number of powder tubes.
3. The method of claim 2, wherein the number of the powder outlet pipes is six, and the current operation mode of the coal mill is determined according to the opening number of the outlet door, specifically:
if the starting number is six, the current operation mode is a six-powder-tube operation mode;
if the starting number is five, the current operation mode is a five-powder-tube operation mode;
if the number of the opening is four, the current operation mode is a four-powder-tube operation mode;
and if the starting number is three, the current operation mode is a three-powder-tube operation mode.
4. The method according to claim 3, wherein the allowable switching mode of the coal pulverizer is determined according to the current operation mode and the allowable change value and the allowable minimum value of the number of the switches, specifically:
if the current operation mode is the six powder tube operation mode, the allowable switching mode is to be switched from the six powder tube operation mode to the five powder tube operation mode;
if the current operation mode is the five powder tube operation mode, the allowable switching mode is to switch the five powder tube operation mode to the six powder tube operation mode, or to switch the five powder tube operation mode to the four powder tube operation mode;
if the current operation mode is the four powder tube operation mode, the allowable switching mode is to switch the four powder tube operation mode to the five powder tube operation mode, or to switch the four powder tube operation mode to the three powder tube operation mode;
and if the current operation mode is the three powder tube operation mode, the allowable switching mode is to switch the three powder tube operation mode into the four powder tube operation mode.
5. The method of claim 4,
if the target switching mode is to switch the operation mode of the six powder tubes to the operation mode of the five powder tubes, the target permission condition is a first permission condition, and the first permission condition includes: the coal quantity of the coal mill is not less than a first coal quantity and not more than a second coal quantity, the air quantity of the coal mill is not less than a first air quantity and not more than a second air quantity, and the opening quantity is five;
if the target switching mode is to switch the five powder tube operation mode to the four powder tube operation mode, the target permission condition is a second permission condition, and the second permission condition includes: the coal quantity is not less than a third coal quantity and not more than a fourth coal quantity, the air quantity is not less than a third air quantity and not more than a fourth air quantity, the opening quantity is four, the third coal quantity is less than the first coal quantity, the fourth coal quantity is less than the second coal quantity, the third air quantity is less than the first air quantity, and the fourth air quantity is less than the second air quantity;
if the target switching mode is to switch the four powder tube operation mode to the three powder tube operation mode, the target permission condition is a third permission condition, and the third permission condition includes: the coal quantity is not less than a fifth coal quantity and not more than a sixth coal quantity, the air quantity is not less than a fifth air quantity and not more than a sixth air quantity, the opening quantity is three, the fifth coal quantity is less than the third coal quantity, the sixth coal quantity is less than the fourth coal quantity, the fifth air quantity is less than the third air quantity, and the sixth air quantity is less than the fourth air quantity;
if the target switching mode is to switch the three powder tube operation mode to the four powder tube operation mode, the target permission condition is the second permission condition;
if the target switching mode is to switch the four powder tube operation mode to the five powder tube operation mode, the target permission condition is the first permission condition;
if the target switching mode is to switch the five powder tube operation mode to the six powder tube operation mode, the target permission condition is a fourth permission condition, and the fourth permission condition includes: the coal quantity is larger than a seventh coal quantity, the air quantity is larger than a seventh air quantity, the opening quantity is six, the seventh coal quantity is larger than the first coal quantity and smaller than the second coal quantity, and the seventh air quantity is larger than the first air quantity and smaller than the second air quantity.
6. The method of claim 5,
the control logic of the five powder tube operation modes comprises: the coal quantity is not less than the first coal quantity and not more than the second coal quantity, the wind coal curve meets a first curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are first upper and lower limits, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is five out of six, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than a first threshold value, the condition that the primary air quantity low protection tripping of the coal mill is that the air quantity is lower than a second threshold value and a preset time length is delayed, the condition that the primary air quantity low protection tripping of the coal feeder is that the air quantity is lower than the first threshold value and the preset time length is delayed, and the first threshold value is larger than the second threshold value;
the control logic of the four powder tube operation modes comprises the following steps: the coal quantity is not less than the third coal quantity and not more than the fourth coal quantity, the wind coal curve meets a second curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are the first upper limit and the first lower limit, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is five out of six, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than the third threshold, the condition of primary air quantity low protection tripping of the coal mill is that the air quantity is lower than the fourth threshold and the preset time length is delayed, the condition of primary air quantity low protection tripping of the coal feeder is that the air quantity is lower than the third threshold and the preset time length is delayed, the third threshold is larger than the fourth threshold and smaller than the first threshold, and the fourth threshold is smaller than the second threshold;
the control logic of the operation modes of the three powder tubes comprises the following steps: the coal quantity is not less than the fifth coal quantity and not more than the sixth coal quantity, the wind coal curve meets a third curve, the upper limit and the lower limit of the deviation of the coal feeder instruction are the first upper limit and the first lower limit, the coal mill outlet door closing and tripping logic is cancelled, the fire detection protection is six to five, the alarm condition that the primary air quantity of the coal mill is low is that the air quantity is lower than the fifth threshold, the condition that the primary air quantity of the coal mill is low to protect tripping operation is that the air quantity is lower than the sixth threshold and delay the preset duration, the condition that the primary air quantity of the coal feeder is low to protect tripping operation is that the air quantity is lower than the fifth threshold and delay the preset duration, the fifth threshold is greater than the sixth threshold and smaller than the third threshold, and the sixth threshold is smaller than the fourth threshold.
7. The method according to claim 6, characterized in that said first curve is determined according to a first formula, in particular: 0.7029M +57.44, the second curve being determined according to a second formula, the second formula being in particular: 0.8278M +44.2, the third curve being determined according to a third formula, the third formula being in particular: and F is 0.8286M +34.3, wherein F is the air volume and M is the coal volume.
8. The utility model provides a controlling means of system of making powder, is applied to in the system of making powder that includes feeder and coal pulverizer, the coal pulverizer includes many play powder pipes that are used for carrying the buggy to the boiler combustor, each be provided with the export door of control play powder pipe break-make on going out the powder pipe, its characterized in that, the device includes:
the first determining module is used for determining the current operation mode of the coal mill according to the opening number of the outlet door;
the second determining module is used for determining an allowable switching mode of the coal mill according to the current operation mode, the allowable change value and the allowable lowest value of the opening number;
the switching module is used for switching the coal mill from the current operation mode to a target operation mode corresponding to a target switching mode if a switching instruction for the target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode;
wherein the number of firing is different in the current operating mode and in the target operating mode.
9. The apparatus of claim 8, wherein the allowable change value is one, and the allowable minimum value is half of the number of powder tubes.
10. A computer-readable storage medium having stored therein instructions which, when run on a terminal device, cause the terminal device to execute the method of controlling a pulverizing system according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653167.8A CN113477389B (en) | 2021-06-11 | 2021-06-11 | Control method and device of pulverizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110653167.8A CN113477389B (en) | 2021-06-11 | 2021-06-11 | Control method and device of pulverizing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113477389A true CN113477389A (en) | 2021-10-08 |
| CN113477389B CN113477389B (en) | 2023-07-11 |
Family
ID=77935245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110653167.8A Active CN113477389B (en) | 2021-06-11 | 2021-06-11 | Control method and device of pulverizing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113477389B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606635A (en) * | 2016-07-12 | 2018-01-19 | 华北电力大学（保定） | Warehouse formula pulverized coal carried by hot air system among a kind of single nozzles multitube combination of correspondence |
| CN108413387A (en) * | 2018-03-09 | 2018-08-17 | 山西大学 | A kind of two-way double grading combustion technologies of pulverized-coal fired boiler |
| CN110275561A (en) * | 2018-03-13 | 2019-09-24 | 贝尔泰利联合公司 | Equipment for controlling the fuel-oxidant mixture of premixed gas burner |
| CN209495349U (en) * | 2018-12-14 | 2019-10-15 | 东方电气集团东方锅炉股份有限公司 | A kind of biomass molding fuel and coal direct-coupling pulverized coal preparation system |
| CN111947134A (en) * | 2020-08-31 | 2020-11-17 | 华北电力科学研究院有限责任公司 | Pulverizing combustion system |
| CN212901594U (en) * | 2020-08-21 | 2021-04-06 | 西安热工研究院有限公司 | Closed-loop control system of compact pulverized coal distributor |
-
2021
- 2021-06-11 CN CN202110653167.8A patent/CN113477389B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606635A (en) * | 2016-07-12 | 2018-01-19 | 华北电力大学（保定） | Warehouse formula pulverized coal carried by hot air system among a kind of single nozzles multitube combination of correspondence |
| CN108413387A (en) * | 2018-03-09 | 2018-08-17 | 山西大学 | A kind of two-way double grading combustion technologies of pulverized-coal fired boiler |
| CN110275561A (en) * | 2018-03-13 | 2019-09-24 | 贝尔泰利联合公司 | Equipment for controlling the fuel-oxidant mixture of premixed gas burner |
| CN209495349U (en) * | 2018-12-14 | 2019-10-15 | 东方电气集团东方锅炉股份有限公司 | A kind of biomass molding fuel and coal direct-coupling pulverized coal preparation system |
| CN212901594U (en) * | 2020-08-21 | 2021-04-06 | 西安热工研究院有限公司 | Closed-loop control system of compact pulverized coal distributor |
| CN111947134A (en) * | 2020-08-31 | 2020-11-17 | 华北电力科学研究院有限责任公司 | Pulverizing combustion system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113477389B (en) | 2023-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101900316B (en) | Biomass boiler control system | |
| CN102010928B (en) | Converter oxygen lance blowing control method based on dry dedusting process | |
| CN104179704A (en) | Method and device for power plant booster fan runback (RB) | |
| CN103791485A (en) | Optimal control method of water supply system of thermal power generating unit | |
| CN103335530A (en) | Coke oven flue gas waste heat recovery technology | |
| CN201748397U (en) | Biomass boiler control system | |
| CN102654768A (en) | Rule-based power station boiler combustion coal-saving nitrogen-reducing control method and device | |
| CN103868060A (en) | Automatic flame stabilizing device of double-cyclone burner of W-shaped boiler | |
| CN107394827A (en) | The system that a kind of electrode boiler joint accumulation of energy facility carries out power grid frequency modulation | |
| CN103090353A (en) | Method and equipment for automatically controlling biomass boiler | |
| CN202484964U (en) | Automatic control equipment of biomass boiler | |
| CN103870877A (en) | System and method for intelligently controlling boiler combustion based on neural network | |
| CN113477389A (en) | Control method and device of powder making system | |
| CN101951017A (en) | Power frequency automatic switching device for preventing unplanned shutdown of motor | |
| CN203285709U (en) | Auxiliary breakdown load reducing RB device of booster fan in power plant | |
| CN202870566U (en) | DCS-based garbage incineration equipment control system and power plant | |
| CN102588994B (en) | Boiler-gas mixed-combustion gas supply pipe and gas supply method | |
| CN102032588B (en) | Controlling, adjusting and remote monitoring system for fuel gas-fired boiler | |
| CN201507945U (en) | Control, regulation and remote monitoring system for fuel/gas boilers | |
| CN207600230U (en) | Sintering ignition furnace fuel control system | |
| CN204166354U (en) | For the automatic control system of middle-size and small-size coal dust industrial hot water boiler | |
| CN202141070U (en) | Combustion control device for gas injection boilers in oil fields | |
| CN110296386B (en) | Fuel control method under FCB working condition of coal-fired unit for mixed combustion of coal gas | |
| CN117215272A (en) | Intelligent dual-fuel switching control system and method for crude tin smelting furnace | |
| CN206386962U (en) | A kind of two sections of ignition combustion systems of small-power hot air type |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |