CN111306537A - High-tonnage fluidized bed furnace control system adopting sensing automatic optimization - Google Patents

High-tonnage fluidized bed furnace control system adopting sensing automatic optimization Download PDF

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Publication number
CN111306537A
CN111306537A CN202010256226.3A CN202010256226A CN111306537A CN 111306537 A CN111306537 A CN 111306537A CN 202010256226 A CN202010256226 A CN 202010256226A CN 111306537 A CN111306537 A CN 111306537A
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fluidized bed
control
furnace
bed furnace
temperature
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CN202010256226.3A
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CN111306537B (en
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李忠学
龙才一
颜伟
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娄底高安环保科技有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00Fluidised bed combustion apparatus
    • F23C10/18Details; Accessories
    • F23C10/28Control devices specially adapted for fluidised bed, combustion apparatus

Abstract

The invention provides a high-tonnage fluidized bed furnace control system adopting sensing automatic optimization, which comprises a fluidized bed furnace oxygen amount regulating system, a fluidized bed furnace waste heat impulse regulating system and a fluidized bed furnace waste heat steam pressure-temperature coordination system. The high-tonnage fluidized bed furnace control system is connected with an inferior coal feeder system and a blower, the inferior coal feeder system and the blower are connected with a combined variable frequency controller, the fluidized bed furnace waste heat steam pressure-temperature coordination system obtains the pressure and temperature value of the fluidized bed furnace waste heat steam, and provides a feedback signal to the fluidized bed furnace oxygen amount regulation system based on a preset optimization parameter condition; the oxygen amount adjusting system of the fluidized bed furnace is based on the feedback signal, the negative pressure signal and the temperature signal which are acquired by the negative pressure sensor and the hearth cavity temperature sensor.

Description

High-tonnage fluidized bed furnace control system adopting sensing automatic optimization

Technical Field

The application relates to the technical field of optimal control, in particular to a high-tonnage fluidized bed furnace control system adopting sensing automatic optimization.

Background

The conventional fluidized bed furnace is a furnace type for processing ore with the granularity of millimeter, and is one of new combustion technologies developed in recent years. The fluidized bed furnace is a novel high-efficiency and energy-saving combustion device, if optimized control is adopted, the operation intensity and the production cost of workers can be reduced, and the fluidized bed furnace is beneficial to industries such as sulfuric acid production, product roasting and the like.

At present, the problems of low automation degree of an ignition system, low combustion efficiency and the like mainly exist in the fluidized bed furnace, and the high-efficiency, economic and safe operation of the fluidized bed furnace cannot be ensured. Under the new trend of energy conservation and environmental protection at present, the requirements on the control and management level of a boiling furnace are gradually improved, and an advanced combustion control system is necessary to be designed and developed to realize the full-automatic ignition control and the combustion process regulation of the boiling furnace, so that the aims of optimizing operation, saving energy, reducing consumption and realizing safe production are fulfilled.

The problems of low combustion efficiency, low automation degree and low thermal efficiency commonly existing in the prior fluidized bed furnace in China. In addition, the shortage of energy in China and the serious environmental pollution improve the combustion efficiency of the fluidized bed combustion boiler, the energy is saved, and the improvement of the environment is the important importance of sustainable development strategies in China.

However, the circulating fluidized bed type fluidized bed furnace is a novel industrial hot blast stove using coal as fuel, and is influenced by various disturbance factors, and the fluidized bed furnace is difficult to control under different working conditions, which is mainly shown in the following steps: 1) poor matching of blast air and coal feeding amount causes furnace body coking (including high-temperature coking and low-temperature coking) and furnace fire extinguishing; 2) coal waste is caused by manual adjustment of the coal feeder to lag or overshoot; 3) the high milling temperature is caused by untimely adjustment of the fluidized bed furnace, and milling stop (slag production) is caused in serious cases; 4) the difference of manual slag discharging conditions is very large, the insufficient combustion of coal and the increase of blast caused by the untimely slag discharging cause high power consumption, and the poor combustion of the furnace condition caused by excessive slag discharging even cause the flameout of the furnace; 5) the difference of manual fire observation easily causes great fluctuation of the furnace temperature; 6) The manual coal feeding does not cause coal breakage in time or excessive coal feeding causes coal bunker overflow.

The boiling furnace is one of industrial boilers, belongs to industrial equipment which is difficult to control, and particularly has more measurement parameters in ignition and temperature rise control, certain nonlinear characteristics exist between control parameters and disturbance parameters, certain functions and influences are realized, and measurement and control parameters are difficult to control, which is also the difficulty of automatic ignition and temperature rise control of the boiling furnace. In the past, a boiling furnace body is often the key point in the design and manufacturing process of the boiling furnace, but the control equipment is seldom paid attention to, the combustion of the boiling furnace is generally controlled manually, a single-parameter instrument is slowly and gradually adopted for control, and a unit instrument and a comprehensive parameter instrument are applied for control later, but a monitoring instrument and a meter configured for a boiling furnace control system are not perfect enough, and some important operation parameters cannot be transmitted to an industrial control room at all and can only be displayed on site. Therefore, when the load of the boiling furnace is adjusted by an operator, the combustion condition of the boiling furnace cannot be correctly analyzed and accurately judged due to the fact that no data are remotely transmitted, and the operation condition of the boiler is correspondingly adjusted at any time, so that the boiling furnace cannot be well in a good operation condition, the fuel is insufficiently combusted, resource waste and air pollution are serious, and the service life of the boiling furnace is shortened.

The Chinese patent application with the application number of CN201210355502.7 provides a control system and a method for a material layer of a circulating fluidized bed boiler by using a PLC control system, wherein the material layer control system of the circulating fluidized bed boiler comprises a hearth pressure gauge, an air chamber pressure gauge, a material layer temperature gauge, a slag cooler slag discharging temperature gauge, a slag cooler water outlet temperature gauge, a slag cooler water inlet temperature gauge and a slag cooler driving motor; the system also comprises a PLC control system; the hearth pressure gauge and the air chamber pressure gauge are connected with a material layer differential pressure transmitter, and the differential pressure transmitter sends an electric signal to the PLC control system; the slag cooler slag discharging thermometer, the slag cooler water outlet thermometer and the slag cooler water inlet thermometer send electric signals to the PLC control system; the PLC control system sends electric signals to the slag conveying device and the slag cooler driving motor; the material bed control method of the circulating fluidized bed boiler is carried out according to the following procedures: loading slag on a wind plate in a boiler hearth, opening a slag valve, enabling the slag to enter a slag cooler through a slag discharging pipe, and conveying the cooled slag to a slag warehouse through a slag conveying device; an air chamber pressure gauge is arranged in a boiler air chamber, a hearth pressure gauge is arranged in a hearth, the differential pressure of the hearth is measured by a material layer differential pressure transmitter, the differential pressure of a slag material layer in the boiler is used as the furnace slag material layer differential pressure, and the measured material layer differential pressure value is transmitted to a PLC control system; the PLC control system outputs signals through analog quantity according to the height of the material layer differential pressure value, controls the variable frequency rotating speed of a driving motor of the slag cooler, and realizes automatic slag discharge of the boiler.

The utility model patent of the utility model which authorizes the notice to be CN204695073U provides a fluidized bed furnace presses stove control system, includes: the system comprises a master control device and a furnace pressing control device connected with the master control device through a field bus protocol; the furnace pressing control device is respectively connected with: the system comprises a first temperature sensor and a second temperature sensor for measuring the temperature in the furnace, a secondary air gate valve, a primary air fan inlet valve, a main induced draft fan inlet valve, a first frequency converter, a second frequency converter, a third frequency converter and a fourth frequency converter. The utility model reduces the redundancy of thermal post operation on one hand and completes the furnace pressing process very simply; on the other hand, the agglomeration in the boiling furnace hearth caused by improper manual operation during furnace pressing is effectively avoided, unnecessary troubles are caused, and powerful guarantee is provided for next furnace lifting. And the utility model discloses can improve the furnace control system digitization and information-based level, reduce the operation maintenance work load.

However, the inventor finds that the prior art cannot realize the automatic optimization control of the full flow according with the working condition aiming at the combustion control system of the high-tonnage fluidized bed boiler, particularly the combustion air system, the oil supply system, the compressed air fuel oil atomization system, the ignition and monitoring system and the like of the high-tonnage fluidized bed boiler, particularly the high-tonnage fluidized bed boiler adopting the inferior coal supply.

Disclosure of Invention

In order to solve the technical problems, the invention provides a high-tonnage fluidized bed furnace control system adopting sensing automatic optimization, which comprises a fluidized bed furnace oxygen amount regulating system, a fluidized bed furnace waste heat impulse regulating system and a fluidized bed furnace waste heat steam pressure-temperature coordination system. The high-tonnage fluidized bed furnace control system is connected with an inferior coal feeder system and an air blower, the inferior coal feeder system and the air blower are connected with a combined variable frequency controller, the fluidized bed furnace waste heat steam pressure-temperature coordination system obtains the pressure and temperature value of the fluidized bed furnace waste heat steam, and based on a preset optimization parameter condition, a feedback signal is provided for the fluidized bed furnace oxygen amount regulation system; and the oxygen amount adjusting system of the fluidized bed furnace automatically optimizes the oxygen delivery amount of the high-tonnage fluidized bed furnace based on the feedback signal, and the negative pressure signal and the temperature signal which are acquired by the negative pressure sensor and the hearth cavity temperature sensor. The technical scheme of the invention can realize the automatic optimization control of the whole flow which is in line with the working condition, of the combustion control system of the fluidized bed furnace of the high-tonnage fluidized bed furnace, particularly a combustion-supporting air system, an oil supply system, a compressed air fuel oil atomization system, an ignition and monitoring system and the like.

In particular, the technical scheme of the invention is realized,

a high-tonnage fluidized bed furnace control system adopting sensing automatic optimization comprises a fluidized bed furnace oxygen amount regulating system, a fluidized bed furnace waste heat impulse regulating system and a fluidized bed furnace waste heat steam pressure-temperature coordination system;

as a first advantage, different from the prior art, the fluidized bed furnace is a circulating fluidized bed furnace with the evaporation capacity of more than 100t/H, and the high-tonnage fluidized bed furnace control system is connected with a low-grade coal feeder system which comprises a rotating speed sensor and a coal quantity sensor;

in the invention, the high-tonnage fluidized bed furnace control system comprises a negative pressure combustion furnace chamber, wherein a negative pressure sensor and a chamber temperature sensor are arranged in the combustion furnace chamber;

in another aspect, as a further advantage of the present invention, the high tonnage fluidized bed furnace is connected with a blower; and the inferior coal feeder system is connected with the blower to form a combined variable frequency controller.

As a specific implementation, the combined variable frequency controller connected with the low-quality coal feeder system is a feeder frequency converter;

the system comprises a fluidized bed boiler waste heat impulse regulating system, a cascade three-impulse PID controller, a control system and a control system, wherein the fluidized bed boiler waste heat impulse regulating system is based on the cascade three-impulse PID controller;

the system comprises a boiler, a boiler waste heat steam pressure-temperature coordination system, a boiler oxygen amount regulation system and a boiler waste heat steam temperature control system, wherein the boiler waste heat steam pressure-temperature coordination system acquires pressure and temperature values of boiler waste heat steam and provides feedback signals to the boiler oxygen amount regulation system based on preset optimization parameter conditions;

and the oxygen amount adjusting system of the fluidized bed furnace automatically optimizes the oxygen delivery amount of the high-tonnage fluidized bed furnace based on the feedback signal, and the negative pressure signal and the temperature signal which are acquired by the negative pressure sensor and the hearth temperature sensor.

As one of the prominent contributions obtained by long-term research of the inventor, the automatic optimization control of the invention is embodied, and the corresponding key technical means comprises the following optimization parameter determination processes:

the reading value of the negative pressure sensor is P1The reading value of the hearth temperature sensor is T2The reading value of the rotating speed sensor is W, and the reading value of the coal quantity sensor is B; the frequency conversion control coefficient of the current time period of the coal feeder is Kt

Adjusting the variable frequency control coefficient Kt +1 of the coal feeder in the next time period according to the following formula:

wherein tau is the lag time of the coal feeder frequency converter, T is the time constant of the coal feeder frequency converter,

f(P1,T2) Is a negative pressure-temperature correlation function, and satisfies the following relationship:

wherein Q istThe heat output by the boiling furnace in the current time period.

On the basis of the above calculation, further, in the present invention, obtaining the pressure and temperature value of the boiler waste heat steam obtained by the boiler waste heat steam pressure-temperature coordination system, and providing a feedback signal to the boiler oxygen amount adjustment system based on a predetermined optimal parameter searching condition specifically includes:

based on the pressure P and the temperature value temp of the waste heat steam collected by the current time node of the boiling furnace, obtaining a pressure-temperature correlation function F (P, temp) of the pressure P and the temperature value temp, wherein the pressure-temperature correlation function F (P, temp) meets the following conditions:

wherein V is the volume of the high-tonnage fluidized bed furnace; v1 is the volume of the chamber of the combustion furnace;

based on the pressure-temperature correlation function F (P, temp), a feedback signal Back is generated.

As another preferred implementation manner of the combined frequency conversion, the high-tonnage fluidized bed furnace is connected with a blower, the blower is connected with a blower controller, and the blower controller is connected with the coal feeder frequency converter;

obtaining the frequency conversion control coefficient K of the next time period of the coal feedert+1Then, the frequency conversion control coefficient K is simultaneously usedt+1To the blower controller.

Specifically, as a basic feedback parameter for embodying the above sensing automatic optimization, in the present invention, the following key calculation means is used for determining:

the oxygen amount adjusting system of the fluidized bed furnace is based on the feedback signal Back and the negative pressure signal P acquired by the negative pressure sensor and the hearth temperature sensor1And a temperature signal T2Automatically optimizing the oxygen delivery amount Qs of the high-tonnage fluidized bed furnace, which specifically comprises the following steps:

calculating the pressure-temperature correlation function F (P, temp) at the current time nodetA value of (d);

obtaining the pressure-temperature correlation function F (P, temp) at the previous time nodet-1A value of (d);

the feedback signal back is calculated based on the following formula:

wherein, time is the duration time between the current time node and the previous time node, and the unit is S;

then the current time is savedOxygen transfer amount Q at pointstIs determined as follows:

Qst=backgQs(t-1)+(1-back)·Qst

wherein Q iss(t)-1The oxygen delivery at the previous time node.

In a specific structure, the oxygen regulating system of the fluidized bed furnace comprises a furnace gas outlet oxygen regulating system, a fluidized bed furnace air quantity fixed value regulating system and a fluidized bed furnace outlet oxygen-tail temperature cascade regulation control system;

and the system for adjusting the residual heat impulse of the boiling furnace comprises a steam pressure fixed value adjusting and controlling system, a steam temperature adjusting system and a residual heat flow control system.

In the control system adopting the sensing automatic optimization, a control object comprises a fluidized bed combustion control system of a high-tonnage fluidized bed combustion control system, and the fluidized bed combustion control system comprises a combustion-supporting air system, an oil supply system, a compressed air fuel atomization system and an ignition and monitoring system.

Further advantages of the invention will be brought out in further detail in the description of the embodiments section in conjunction with the drawings attached to the description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is an overall architecture diagram of a high tonnage boiler control system employing sensor auto-optimization in accordance with an embodiment of the present invention;

FIG. 2 is a schematic illustration of frequency conversion control coefficients and joint frequency conversion control in the system of FIG. 1;

FIG. 3 is a schematic diagram of the feedback parameters for automatic optimization in the system of FIG. 2 or FIG. 1;

fig. 4 is a schematic diagram of the feedback parameter action object of the automatic optimization in fig. 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 an invasive task, are within the scope of the present invention. The invention is further described with reference to the following drawings and detailed description.

Referring to fig. 1, it is a general architecture diagram of a control system of a high tonnage boiling furnace using sensing auto-optimization according to an embodiment of the present invention.

In fig. 1, the control system of the high-tonnage fluidized bed furnace comprises an oxygen amount regulating system of the fluidized bed furnace, a residual heat impulse regulating system of the fluidized bed furnace and a residual heat steam pressure-temperature coordination system of the fluidized bed furnace;

the high-tonnage fluidized bed furnace control system is connected with a low-grade coal feeder system, and the low-grade coal feeder system comprises a rotating speed sensor and a coal quantity sensor. It should be noted that in this embodiment, the fluidized bed furnace can burn coal with extremely poor quality (such as coal gangue, oil shale, etc.), and the fluidized bed furnace has high combustion heat intensity and buried pipe heat transfer intensity, and has a small furnace chamber size. The load regulation performance of the fluidized bed furnace is good, and the fluidized bed furnace can normally operate within the range of 25% -110% of load.

Although the prior art has a similar structure, the fluidized bed furnace is a complex control object with multiple outputs and multiple outputs, so that the influence factors are more, particularly, when the lean coal fluidized bed furnace burns coal gangue, the combustion process has long lag time, and the requirements are difficult to meet by adopting a conventional automatic control system. At present, most of the control on the boiler still stays in the stage of instrument monitoring and manual control, and the normal operation of the boiler is seriously influenced by the control mode, so that the expected energy-saving effect is far from being achieved.

Therefore, as another improvement of the invention, in this example, the high-tonnage fluidized bed furnace control system comprises a combustion furnace chamber, and the combustion furnace chamber is provided with a negative pressure sensor and a chamber temperature sensor;

in addition, correspondingly, although not shown in fig. 1, the high-tonnage boiling furnace is connected with a blower;

the inferior coal feeder system is also connected with a feeder frequency converter;

the system comprises a fluidized bed boiler waste heat impulse regulating system, a cascade three-impulse PID controller, a control system and a control system, wherein the fluidized bed boiler waste heat impulse regulating system is based on the cascade three-impulse PID controller;

the system comprises a boiler waste heat steam pressure-temperature coordination system, a boiler waste heat steam control system and a boiler waste heat steam temperature control system, wherein the boiler waste heat steam pressure-temperature coordination system acquires the pressure and temperature value of the boiler waste heat steam and provides a feedback signal to the boiler oxygen regulation system based on a preset optimization parameter condition;

and the oxygen amount adjusting system of the fluidized bed furnace automatically optimizes the oxygen delivery amount of the high-tonnage fluidized bed furnace based on the feedback signal, and the negative pressure signal and the temperature signal which are acquired by the negative pressure sensor and the hearth temperature sensor.

Referring next to fig. 2, a schematic diagram of the frequency conversion control coefficients and the joint frequency conversion control in the system of fig. 1 is shown.

In fig. 2, the reading value of the negative pressure sensor is P1, the reading value of the furnace temperature sensor is T2, the reading value of the rotation speed sensor is W, and the reading value of the coal quantity sensor is B; the variable frequency control coefficient of the current time period of the coal feeder is Kt;

adjusting the variable frequency control coefficient Kt +1 of the coal feeder in the next time period according to the following formula:

wherein tau is the lag time of the coal feeder frequency converter, T is the time constant of the coal feeder frequency converter, f (P)1,T2) Is a negative pressure-temperature correlation function, and satisfies the following relationship:

wherein Q istThe heat output by the boiling furnace in the current time period.

Further, referring to fig. 3, the system for coordinating pressure and temperature of residual heat steam of a fluidized bed furnace obtains pressure and temperature value of residual heat steam of the fluidized bed furnace, and provides a feedback signal to the system for adjusting oxygen content of the fluidized bed furnace based on a predetermined optimal parameter condition, specifically comprising:

acquiring a pressure-temperature correlation function F (P, temp) of the pressure P and the temperature value temp based on the pressure P and the temperature value temp of the waste heat steam collected by the current time node of the boiling furnace, wherein the pressure-temperature correlation function F (P, temp) meets the following conditions:

wherein V is the volume of the high-tonnage fluidized bed furnace; v1 is the volume of the chamber of the combustion furnace; based on the pressure-temperature correlation function F (P, temp), a feedback signal Back is generated.

More specifically, the oxygen content adjusting system of the fluidized bed furnace automatically optimizes the oxygen delivery amount Qs of the high-tonnage fluidized bed furnace based on the feedback signal Back, and a negative pressure signal P1 and a temperature signal T2 acquired by the negative pressure sensor and a hearth temperature sensor, and specifically comprises:

calculating the pressure-temperature correlation function F (P, temp) at the current time nodetA value of (d);

obtaining the pressure-temperature correlation function F (P, temp) at the previous time nodet-1A value of (d);

the feedback signal back is calculated based on the following formula:

wherein, time is the duration time between the current time node and the previous time node, and the unit is s;

the oxygen delivery amount Qst at the current time node is determined as follows:

Qst=backgQs(t-1)+(1-back)·Qst

wherein Q iss(t)-1The oxygen delivery at the previous time node.

On the basis of FIGS. 1-3, the high-tonnage fluidized bed furnace is connected with an air blower which is connected with an air blower controller, and the air blower controller is connected with the coal feeder frequency converter;

and after the variable frequency control coefficient Kt +1 of the coal feeder in the next time period is obtained, transmitting the variable frequency control coefficient Kt +1 to the blower controller.

Referring to fig. 4, the oxygen regulating system of the fluidized bed furnace comprises a furnace gas outlet oxygen regulating system, a fluidized bed furnace air quantity fixed value regulating system and a fluidized bed furnace outlet oxygen quantity-tail temperature cascade regulating control system. The system for adjusting the residual heat impulse of the fluidized bed furnace comprises a steam pressure fixed value adjusting and controlling system, a steam temperature adjusting system and a residual heat flow control system.

The system further comprises a combustion control system of the fluidized bed furnace, wherein the combustion control system of the fluidized bed furnace comprises a combustion-supporting air system, an oil supply system, a compressed air fuel atomization system and an ignition and monitoring system.

In the control system adopting the sensing automatic optimization, a control object comprises a fluidized bed furnace combustion control system of a high-tonnage fluidized bed furnace control system, and the fluidized bed furnace combustion control system comprises a combustion-supporting air system, an oil supply system, a compressed air fuel oil atomization system and an ignition and monitoring system.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. A high-tonnage fluidized bed furnace control system adopting sensing automatic optimization comprises a fluidized bed furnace oxygen amount regulating system, a fluidized bed furnace waste heat impulse regulating system and a fluidized bed furnace waste heat steam pressure-temperature coordination system;
the method is characterized in that:
the high-tonnage fluidized bed furnace control system is connected with a low-grade coal feeder system, and the low-grade coal feeder system comprises a rotating speed sensor and a coal quantity sensor;
the high-tonnage fluidized bed furnace control system comprises a combustion furnace chamber, wherein a negative pressure sensor and a chamber temperature sensor are arranged in the combustion furnace chamber;
the high-tonnage fluidized bed furnace is connected with a blower;
the inferior coal feeder system is also connected with a feeder frequency converter;
the system comprises a fluidized bed boiler waste heat impulse regulating system, a cascade three-impulse PID controller, a control system and a control system, wherein the fluidized bed boiler waste heat impulse regulating system is based on the cascade three-impulse PID controller;
the system comprises a boiler waste heat steam pressure-temperature coordination system, a boiler waste heat steam control system and a boiler waste heat steam temperature control system, wherein the boiler waste heat steam pressure-temperature coordination system acquires the pressure and temperature value of the boiler waste heat steam and provides a feedback signal to the boiler oxygen regulation system based on a preset optimization parameter condition;
and the oxygen amount adjusting system of the fluidized bed furnace automatically optimizes the oxygen delivery amount of the high-tonnage fluidized bed furnace based on the feedback signal, and the negative pressure signal and the temperature signal which are acquired by the negative pressure sensor and the hearth temperature sensor.
2. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as claimed in claim 1, characterized in that:
the boiling furnace is a circulating boiling furnace with the evaporation capacity of more than 100 t/H.
3. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as claimed in claim 1, characterized in that:
the reading value of the negative pressure sensor is P1The reading value of the hearth temperature sensor is T2The reading value of the rotating speed sensor is W, and the reading value of the coal quantity sensor is B; the frequency conversion control coefficient of the current time period of the coal feeder is Kt
Adjusting the variable frequency control coefficient Kt +1 of the coal feeder in the next time period according to the following formula:
wherein tau is the lag time of the coal feeder frequency converter, T is the time constant of the coal feeder frequency converter, f (P)1,T2) Is a negative pressure-temperature correlation function, and satisfies the following relationship:
wherein Q istThe heat output by the boiling furnace in the current time period.
4. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as set forth in claim 3, characterized in that:
the system for coordinating the pressure and the temperature of the waste heat steam of the boiling furnace obtains the pressure and the temperature value of the waste heat steam of the boiling furnace, and provides a feedback signal to the system for adjusting the oxygen content of the boiling furnace based on a preset optimizing parameter condition, and the system specifically comprises:
acquiring a pressure-temperature correlation function F (P, temp) of the pressure P and the temperature value temp based on the pressure P and the temperature value temp of the waste heat steam collected by the current time node of the boiling furnace, wherein the pressure-temperature correlation function F (P, temp) meets the following conditions:
wherein V is the volume of the high-tonnage fluidized bed furnace; v1The volume of the combustion furnace chamber cavity is shown;
based on the pressure-temperature correlation function F (P, temp), a feedback signal Back is generated.
5. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as set forth in claim 3, characterized in that:
the high-tonnage fluidized bed furnace is connected with an air blower, the air blower is connected with an air blower controller, and the air blower controller is connected with the coal feeder frequency converter;
obtaining the frequency conversion control coefficient K of the next time period of the coal feedert+1Then, the frequency conversion control coefficient K is simultaneously usedt+1To the blower controller.
6. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as set forth in claim 4, characterized in that:
the oxygen amount adjusting system of the fluidized bed furnace is based on the feedback signal Back and the negative pressure signal P acquired by the negative pressure sensor and the hearth temperature sensor1And a temperature signal T2Automatically optimizing the oxygen delivery amount Qs of the high-tonnage fluidized bed furnace, which specifically comprises the following steps:
calculating the pressure-temperature correlation function F (P, temp) at the current time nodetA value of (d);
obtaining the pressure-temperature correlation function F (P, temp) at the previous time nodet-1A value of (d);
the feedback signal back is calculated based on the following formula:
wherein, time is the duration time between the current time node and the previous time node, and the unit is s;
the oxygen delivery Q at the current time nodestIs determined as follows:
Qst=backgQs(t-1)+(1-back)·Qst
wherein Q iss(t-1)The oxygen delivery at the previous time node.
7. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as claimed in claim 1 or 4, characterized in that:
the oxygen regulating system of the fluidized bed furnace comprises a furnace gas air outlet oxygen regulating system, a fluidized bed furnace air quantity fixed value regulating system and a fluidized bed furnace outlet oxygen quantity-tail temperature cascade regulating control system.
8. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as claimed in claim 1, characterized in that:
the system for adjusting the residual heat impulse of the fluidized bed furnace comprises a steam pressure fixed value adjusting and controlling system, a steam temperature adjusting system and a residual heat flow control system.
9. The control system of the high-tonnage boiling furnace adopting the sensing automatic optimization as claimed in claim 1, characterized in that:
the system further comprises a combustion control system of the fluidized bed furnace, wherein the combustion control system of the fluidized bed furnace comprises a combustion-supporting air system, an oil supply system, a compressed air fuel atomization system and an ignition and monitoring system.
CN202010256226.3A 2020-04-02 2020-04-02 High-tonnage fluidized bed furnace control system adopting sensing automatic optimization CN111306537B (en)

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CN209173409U (en) * 2018-08-20 2019-07-30 河南骏化发展股份有限公司 Energy saver is used in connection alkali production

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