CN112327778B - Automatic primary air pressure adjusting method for thermal power plant - Google Patents
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- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41865—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by job scheduling, process planning, material flow
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Abstract
The invention discloses a method for automatically adjusting primary wind pressure of a thermal power plant, which is characterized in that historical data for adjusting the primary wind pressure are stored in an inductive manner through a DCS (distributed control system) system of the power plant to form a database, various factors of each load section influencing the primary wind pressure are found out by utilizing an MATLAB (matrix laboratory) data processing tool, corresponding primary wind pressure real-time values under various equipment valve states are used as primary wind pressure required values in the current system, a primary fan frequency conversion instruction is obtained through calculation, and an automatic execution mechanism is operated through a control system to adjust the primary wind pressure in real time, so that accurate automatic adjustment is realized; the problem of prior art precision low, efficiency poor, the energy consumption is high, artifical intensity of labour is big is solved, have high-efficient accurate, can effectively reduce the fan energy consumption, automatic adjustment, labour saving and time saving's characteristics.
Description
Technical Field
The invention belongs to the technical field of thermal power generation primary wind pressure adjustment, and particularly relates to a method for automatically adjusting primary wind pressure of a thermal power plant.
Background
The primary air is used as coal supply air in a thermal power plant, one path of the primary air is called hot primary air after passing through an air preheater, and the other path of the primary air is called cold primary air without passing through the air preheater. The hot primary air provides drying output and ventilation output for the coal mill, and pulverized coal ground by the coal mill is dried and then enters a boiler burner along with the pulverized coal; the cold primary air and the hot primary air are mixed at the inlet of the coal mill, so that the temperature of the inlet and the outlet of the coal mill is adjusted, and the cold primary air and the hot primary air are part of the ventilation output of the coal mill; the pulverized coal carried by the primary air enters the hearth and then is provided for oxygen combustion through the secondary air.
When working condition adjustment such as multiple coal types change, multiple load change, coal mill starting and stopping and the like is carried out in thermal power generation, the wind pressure of primary air needs to be correspondingly corrected to adjust the fuel quantity entering a hearth, so that the heat storage requirement of a boiler is met, and an output electric load target is matched; the existing primary air pressure adjusting technology is that an operator manually sets a primary air pressure value through a single loop, or the set value of the air pressure at one side is roughly corrected by finely adjusting the number of starting and stopping coal mills according to experience; such an adjustment has the following problems: firstly, manual adjustment is needed after each load change, the workload is large, and the automation degree is low; secondly, the adjustment process is relatively extensive, the accuracy requirement cannot be met by one-time adjustment, data correction needs to be carried out repeatedly, and the efficiency is relatively low; finally, the accurate adjustment cannot be achieved directly by setting a primary air pressure value, fine adjustment needs to be carried out by assisting in throttling of an inlet baffle of the coal mill, certain air pressure waste can be caused by throttling, unnecessary power consumption of the fan is increased, and energy conservation and emission reduction are not facilitated.
Therefore, it is necessary to design an automatic primary air pressure adjusting method for a thermal power plant to solve the above problems.
Disclosure of Invention
The invention aims to provide an automatic primary air pressure adjusting method for a thermal power plant, which is used for replacing the existing rough primary air pressure adjusting method for manually setting a primary air pressure value by an operator or roughly correcting by starting and stopping a coal mill, so as to achieve the aim of accurate and rapid adjustment; the invention utilizes big data thought, the historical data of primary wind pressure manually adjusted by an operator is induced and stored through DCS of a boiler combustion system of a power plant to form a database, then MATLAB data processing tools are utilized to fit various factors, primary wind pressure real-time values corresponding to various equipment valve states and current output electric loads, primary wind pressure demand corresponding to a current AGC load instruction is found out, then the number of capacity air doors in current operation and the total contribution of the opening degree to the primary wind pressure of the system are found out, a primary wind pressure value of a main pipe corresponding to the current AGC load instruction is obtained after the two values are subtracted, the primary wind pressure dynamic demand of the whole boiler combustion system is obtained by making a difference with the primary wind pressure value of the main pipe under the current load, corresponding primary wind pressure deviation is sent to PID operation after corresponding humanized offset is added, and a primary fan frequency conversion instruction is obtained, the primary air system is used for adding and subtracting a primary air fan frequency converter, and finally the primary air system meets the current load requirement; accurate automatic adjustment is realized; the problems of rough structure, low precision, poor efficiency and high energy consumption in the prior art are solved, and the fan has the characteristics of high efficiency, accuracy and capability of effectively reducing the energy consumption of the fan.
In order to realize the technical characteristics, the invention adopts the technical scheme that: a method for automatically adjusting primary air pressure of a thermal power plant comprises the following steps:
step S1: when the system AGC load instruction changes, fitting a data corresponding relation between a main steam flow corresponding to the current AGC load instruction and a system required primary air pressure value by using an MATLAB tool through a database in a DCS to obtain a system required primary air pressure value K1 required by the current AGC load instruction;
step S2: judging whether the capacity air doors are in an operating state or not through the coal mill operating signals and the opening degree of the capacity air doors, determining the number M of the capacity air doors in operation, and obtaining a primary air pressure contribution value K2 corresponding to the current number M of the capacity air doors in operation;
step S3: calculating the average opening degree N of the capacity air doors in the current state by counting the total instructions and the total number of the capacity air doors put into operation to obtain a primary air pressure contribution value K3 corresponding to the opening degree N of the current capacity air doors; obtaining a total primary wind pressure contribution value K4 of the opening degrees of the capacity air doors in the current M operations through K3M;
step S4: calculating a primary air pressure value K5 of a main pipe corresponding to the current AGC load instruction, wherein the calculation method comprises the following steps:
K5=K1-（K2+K4）；
step S5: calculating a primary air pressure adjusting value delta K required by the current system; the calculation method is as follows:
a. collecting a primary air pressure value K6 of the main pipe under the current load;
b.△K= K5- K6；
the delta K is a positive value indicating that the primary wind pressure value of the main pipe needs to be increased; the delta K is negative, and the primary air pressure value of the main pipe needs to be reduced by the system;
step S6: after a loop is formed by a primary air pressure adjusting value delta K, a corresponding offset loop is added for manual fine adjustment of an operator, and the fine adjustment value is delta E; the final primary air pressure deviation value (delta K plus delta E) is sent to a primary air pressure PID control loop, and is processed to output an instruction to a field execution mechanism, so that the real-time automatic adjustment of the primary air pressure is completed;
step S7: after primary wind pressure adjustment is completed, when the current output electric load reaches the electric load required by the AGC load instruction, the system tends to be stable, and the DCS records the corresponding equipment valve state and the corresponding primary wind pressure value data, so that database updating is completed.
In step S1, the database in the DCS system includes DCS history data of adjusting the combustion system of the power plant boiler in the manual state or the automatic state; when various data records in the database set are recorded, a corresponding hysteresis link needs to be added to the DCS so as to reduce the hysteresis of the electric load corresponding to the change of primary wind pressure.
In step S1, the primary wind pressure value required by the system is various factors affecting the primary wind pressure of each load segment and the corresponding primary wind pressure real-time values in the valve states of various devices.
In step S2, the number of different capacity dampers corresponds to a fixed primary wind pressure contribution value, and the data correspondence relationship is stored in the database.
In step S3, the primary wind pressure contribution values corresponding to different opening degrees of the capacity damper are in a fixed functional relationship, and the functional relationship is stored in the database.
The invention has the beneficial effects that:
1, utilizing big data thought, inducting and storing historical data of past manually adjusted primary wind pressure of a thermal power plant through DCS of a boiler combustion system of the power plant to form a database, utilizing MATLAB data processing tools to analyze and process data in the database, fitting data corresponding relation between capacity air door operation number, capacity air door opening degree, primary wind pressure value and output electric load, and further utilizing the data corresponding relation to enable a wind pressure adjusting process to be separated from rough adjustment of operators through experience and repeated fine adjustment, turning to automatic accurate adjustment of a control system guided by dynamic data, and greatly improving accuracy of primary wind pressure adjustment.
2. Fitting a data corresponding relation between system requirement primary wind pressure values corresponding to output electrical loads by using an MATLAB data processing tool, finding out a system requirement primary wind pressure value corresponding to a current AGC load instruction at any time according to the data corresponding relation, subtracting a total primary wind pressure contribution value of the operation number and the opening of a capacity air door according to the value, and then making a difference with the current master pipe primary wind pressure value to quickly calculate a primary wind pressure dynamic adjustment quantity required by the current system; the logic of the calculation process is clear, simple and efficient, primary air pressure dynamic adjustment amount can be quickly obtained through the DCS control system, automatic adjustment is carried out through the automatic execution mechanism, large workload caused by frequent manual adjustment is eliminated, the primary air pressure can be automatically adjusted in real time through the system, and the working efficiency is improved.
3. All the automatically adjusted data also form a data set to be stored in a database of the DCS, so that the database is continuously expanded; during adjustment each time, the new expanded database is used for fitting the functional relationship again, so that the fitted function is always in the dynamic correction process, and when more data exist in the database, the fitted function can truly reflect the corresponding relationship among various data of the current unit, and the accuracy of primary air pressure automatic adjustment is continuously improved.
4. Need not to carry out structural transformation and adjustment to current boiler combustion system, do benefit to and develop and implement in current thermal generator set.
5. The adjusting process is accurately adjusted through the calculated data of the control system, manual adjustment is carried out by the aid of the bias loop, throttling effect of the inlet baffle of the coal mill is reduced to the maximum extent, a primary air pressure value is reduced to the maximum extent, and therefore energy consumption of the primary air fan is reduced.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a logic diagram of the present invention.
Detailed Description
Example 1:
as shown in fig. 1, an automatic primary air pressure adjusting method for a thermal power plant includes the following steps:
step S1: when the system AGC load instruction changes, fitting a data corresponding relation between a main steam flow corresponding to the current AGC load instruction and a system required primary air pressure value by using an MATLAB tool through a database in a DCS to obtain the system required primary air pressure value K1=8.48KPa required by the current AGC load instruction;
step S2: judging whether the capacity air door is in an operating state or not through the coal mill operating signal and the size logic of the opening degree of the capacity air door, determining the number M =4 of the capacity air door operation, and obtaining a primary air pressure contribution value K2=2.33KPa corresponding to the current number M of the capacity air door operation;
step S3: calculating the average opening N =57% of the capacity air doors in the current state by counting the total instructions and the total number of the capacity air doors put into operation, and obtaining a primary air pressure contribution value K3=0.1875 corresponding to the opening N of the current capacity air doors; obtaining a total primary wind pressure contribution value K4=0.75 of the opening degrees of the capacity air doors in the current M running processes through K3M;
step S4: calculating a primary air pressure value K5 of a main pipe corresponding to the current AGC load instruction, wherein the calculation method comprises the following steps:
K5=K1-（K2+K4）=5.4 KPa；
step S5: calculating a primary air pressure adjusting value delta K required by the current system; the calculation method is as follows:
a. collecting a primary wind pressure value K6=5.0KPa of a main pipe under the current load;
b.△K= K5- K6=0.4KPa；
the delta K is a positive value indicating that the primary wind pressure value of the main pipe needs to be increased; the delta K is negative, and the primary air pressure value of the main pipe needs to be reduced by the system;
step S6: after a loop is formed by a primary air pressure adjusting value delta K, a corresponding offset loop is added for manual fine adjustment of an operator, and the fine adjustment value is delta E; the final primary air pressure deviation value (delta K plus delta E) is sent to a primary air pressure PID control loop, and is processed to output an instruction to a field execution mechanism, so that the real-time automatic adjustment of the primary air pressure is completed;
step S7: after primary wind pressure adjustment is completed, when the current output electric load reaches the electric load required by the AGC load instruction, the system tends to be stable, and the DCS records the corresponding equipment valve state and the corresponding primary wind pressure value data, so that database updating is completed.
In step S1, the database in the DCS system includes DCS history data of adjusting the combustion system of the power plant boiler in the manual state or the automatic state; when various data records in the database set are recorded, a corresponding hysteresis link needs to be added in the DCS so as to reduce the hysteresis of the change of the primary wind pressure corresponding to the electric load.
In step S1, the system requires the primary wind pressure values to be various factors affecting the primary wind pressure of each load segment and corresponding primary wind pressure real-time values under various equipment valve states.
In step S2, the number of different capacity dampers corresponds to a fixed primary wind pressure contribution value, and the data correspondence relationship is stored in the database.
In step S3, the primary wind pressure contribution values corresponding to different opening degrees of the capacity damper are in a fixed functional relationship, and the functional relationship is stored in the database.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (4)
1. A method for automatically adjusting primary wind pressure of a thermal power plant is characterized by comprising the following steps: it comprises the following steps:
step S1: when the system AGC load instruction changes, fitting a data corresponding relation between a main steam flow corresponding to the current AGC load instruction and a system required primary air pressure value by using an MATLAB tool through a database in a DCS to obtain a system required primary air pressure value K1 required by the current AGC load instruction;
step S2: judging whether the capacity air door is in an operating state or not through the coal mill operating signal and the opening degree of the capacity air door, and determining the number M of the capacity air door to operate to obtain a primary air pressure contribution value K2 corresponding to the current number M of the capacity air door to operate;
step S3: calculating the average opening N of the capacity air doors in the current state by counting the total instructions and the total number of the capacity air doors put into operation, and obtaining a primary air pressure contribution value K3 corresponding to the average opening N of the current capacity air doors; obtaining a total primary wind pressure contribution value K4 of the opening degrees of the capacity air doors in the current M operations through K3M;
step S4: calculating a primary air pressure value K5 of a main pipe corresponding to the current AGC load instruction, wherein the calculation method comprises the following steps:
K5=K1-（K2+K4）；
step S5: calculating a primary air pressure adjusting value delta K required by the current system; the calculation method is as follows:
a. collecting a primary wind pressure value K6 of the main pipe under the current load;
b.△K= K5- K6；
the delta K is a positive value indicating that the primary air pressure value of the main pipe needs to be increased by the system; the delta K is negative, and the primary air pressure value of the main pipe needs to be reduced by the system;
step S6: after a loop is formed by a primary air pressure adjusting value delta K, a corresponding offset loop is added for manual fine adjustment of an operator, and the fine adjustment value is delta E; the final primary air pressure deviation value (delta K plus delta E) is sent to a primary air pressure PID control loop, and is processed to output an instruction to a field execution mechanism, so that the real-time automatic adjustment of the primary air pressure is completed;
step S7: after primary wind pressure adjustment is completed, when the current output electric load reaches the electric load required by the AGC load instruction, the system tends to be stable, and the DCS records the corresponding equipment valve state and the corresponding primary wind pressure value data, so that database updating is completed.
2. The method for automatically adjusting the primary wind pressure of the thermal power plant according to claim 1, wherein the method comprises the following steps: in step S1, a database in the DCS system includes DCS history data of adjusting the combustion system of the power plant boiler in a manual state or an automatic state; when various data records in the database set are recorded, a corresponding hysteresis link needs to be added in the DCS so as to reduce the hysteresis of the change of the primary wind pressure corresponding to the electric load.
3. The method for automatically adjusting the primary wind pressure of the thermal power plant according to claim 1, wherein the method comprises the following steps: in step S2, the number of different capacity dampers corresponds to a fixed primary wind pressure contribution value, and the data correspondence relationship is stored in the database.
4. The method for automatically adjusting the primary wind pressure of the thermal power plant according to claim 1, wherein the method comprises the following steps: in step S3, the primary wind pressure contribution values corresponding to different opening degrees of the capacity damper are in a fixed functional relationship, and the functional relationship is stored in the database.
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| CN104456614B (en) * | 2014-11-04 | 2017-02-15 | 大唐韩城第二发电有限责任公司 | Primary air pressure automatic optimization system and method of primary air fan of power plant boiler |
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| CN105182925B (en) * | 2015-08-12 | 2016-08-17 | 国家电网公司 | A kind of energy-saving control method for coordinating of thermal power generation unit |
| CN107062303B (en) * | 2016-12-30 | 2019-04-19 | 上海外高桥第二发电有限责任公司 | A kind of 900MW station boiler heat primary air pressure optimizes and revises method |
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