CN113028441A - Coal mill outlet temperature adjusting method and device and storage medium - Google Patents
Coal mill outlet temperature adjusting method and device and storage medium Download PDFInfo
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- CN113028441A CN113028441A CN202110286132.5A CN202110286132A CN113028441A CN 113028441 A CN113028441 A CN 113028441A CN 202110286132 A CN202110286132 A CN 202110286132A CN 113028441 A CN113028441 A CN 113028441A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/103—Pulverizing with hot gas supply
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Abstract
The embodiment of the specification provides a coal mill outlet temperature adjusting method, a coal mill outlet temperature adjusting device and a storage medium. The method comprises the following steps: disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the current state of the control factors calculated according to the second function, the target opening degree of the cold flue gas regulating valve is adjusted when the outlet temperature of the coal mill is regulated to be a preset value, so that the outlet temperature of the coal mill is regulated according to the target opening degree, and the fluctuation range of the outlet temperature of the coal mill is reduced.
Description
Technical Field
The embodiment of the specification relates to the technical field of thermal power generation, in particular to a coal mill outlet temperature adjusting method and device and a storage medium.
Background
In a thermal generator set, a coal mill is an important device of a pulverizing system in a thermal power plant. Coal mills are machines for breaking up and grinding coal briquettes into coal dust, which are important auxiliary equipment for coal dust furnaces. The coal grinding process is a process in which coal is crushed and its surface area is increased continuously. To increase the new surface area, the binding force between solid molecules must be overcome, and thus energy is consumed. The coal is ground into coal powder in a coal mill mainly by three modes of crushing, smashing and grinding. Wherein the energy consumed by the crushing process is the least. The grinding process is most energy intensive. The two or three modes of the various coal mills are combined in the pulverizing process, but the main mode is determined by the type of the coal mill.
According to the distribution condition of national coal, in order to reduce the power generation cost, an ultra-supercritical thermal power generator set is built in a lignite production place. According to the characteristics of lignite such as heat productivity and moisture, part of unit boilers are combusted in a fan type coal mill mode. According to the system process characteristics of the boiler in the combustion mode and the characteristic that the lignite is easy to spontaneously combust, the control of the outlet temperature of the coal mill is very important, and not only is enough drying output capacity ensured, but also the combustion requirement of the boiler is met; the safety of the operation of the coal mill is ensured, and the coal mill is prevented from firing and exploding. At present, the control of the outlet temperature of the coal mill is mainly divided into manual regulation and automatic regulation. Wherein: the manual regulation is mainly realized by regulating the primary air quantity and the ratio of cold air to hot air, when the temperature of the coal mill outlet needs to be reduced, the hot air door is closed, the cold air door is opened, and the temperature of the coal mill outlet is reduced to a required value under the condition of keeping the air quantity unchanged; the automatic adjustment needs an automatic adjustment system to realize, and in the automatic adjustment system, the outlet temperature of the coal mill is controlled by adjusting the cold air door.
For an automatic regulating system, a control parameter, namely the actual temperature of the outlet of the coal mill, needs to be obtained, for the measurement of the actual temperature of the outlet of the coal mill, three temperature measuring points are generally adopted, and the median value of the measured values of the three temperature measuring points is taken as the measured actual temperature. The measured actual temperature is compared with the set temperature and an adjustment is made if there is a deviation. The automatic regulating system forms a control instruction through the PID regulator according to the deviation of the measured actual temperature value and a set value, and realizes that the outlet temperature of the coal mill is stabilized at the set value by regulating the opening degree of the air door.
Because the power grid requires that the unit has a sufficiently fast load change rate, the increase and decrease of the coal amount of the coal mill are correspondingly accelerated, the process inevitably causes great disturbance to the outlet temperature, and the condition that the single-loop PID control cannot be adjusted possibly occurs, so that the tripping operation is triggered due to the over-limit protection of the equipment temperature; meanwhile, the operator needs to monitor the temperature condition, and if the operator does not operate properly, the protection action will occur.
Disclosure of Invention
The purpose of the embodiments of the present specification is to provide a method, an apparatus, and a storage medium for regulating the outlet temperature of a coal mill, so as to reduce the fluctuation range of the outlet temperature of the coal mill and improve the stability of the operation of the equipment.
To solve the above problem, an embodiment of the present specification provides a coal mill outlet temperature adjusting method, including: disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree.
To solve the above problem, embodiments of the present specification further provide a coal mill outlet temperature adjusting device, where the device includes: the obtaining module is used for applying disturbance to the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill; the control module is used for controlling the opening of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill under the condition that the state of the control factor is unchanged, so as to obtain a first function representing the relation between the opening of the cold flue gas regulating valve and the outlet temperature of the coal mill; the determining module is used for determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and the adjusting module is used for calculating the target opening of the cold flue gas adjusting valve when the outlet temperature of the coal mill is adjusted to be a preset value according to the second function under the condition that the current outlet temperature of the coal mill is within a preset temperature range, so that the outlet temperature of the coal mill can be adjusted according to the target opening.
To solve the above problem, embodiments of the present specification further provide a computer-readable storage medium having stored thereon computer instructions, which when executed, implement: disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree.
According to the technical scheme provided by the embodiment of the specification, the method for adjusting the outlet temperature of the coal mill provided by the embodiment of the specification can apply disturbance to the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree. The method provided by the embodiment of the specification can be adjusted only according to the difference between the actual outlet temperature of the coal mill and the set value, and can also be adjusted according to the state of the control factor, so that the outlet temperature of the coal mill is controlled.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the specification, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for adjusting the outlet temperature of a coal pulverizer according to an embodiment of the present disclosure;
fig. 2 is a functional module schematic diagram of a coal mill outlet temperature regulating device according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without any creative effort shall fall within the protection scope of the present specification.
The coal mill is an important component of a thermal power plant and is used for crushing and pulverizing raw coal, and a grinding roller and a grinding disc are arranged in the coal mill and are used for crushing and grinding the raw coal. Specifically, the grinding roller can be driven by the grinding disc to rotate, raw coal falling into the grinding disc from the central coal dropping pipe is ground, the ground coal powder is cut off from the grinding disc and thrown out, the coal powder is blown into the separator by the primary air fan, the coarse powder is separated out in the separator and returns to the grinding disc for regrinding, and qualified fine powder is taken out of the separator by the primary air and is sent to the boiler for combustion.
The coal mill workflow may include wind flow and coal flow. The air flow is divided into two paths after the air is pressurized by a primary fan, one path of air enters a cold primary air channel, the other path of air enters a hot primary air channel after being heated by an air preheater, and cold primary air and hot primary air enter a coal mill inlet mixed air channel through a cold flue gas regulating valve and a hot air regulating valve. The mixed air quantity and the outlet temperature of the coal mill can be controlled by adjusting the cold flue gas adjusting valve and the hot air adjusting valve, so that the requirements of conveying and drying different coal quantities are met, and the normal operation of a pulverizing system is ensured. The coal stream comprises: the raw coal enters an electronic gravity belt coal feeder after passing through an upper flashboard door of the coal feeder. The coal falling onto the belt of the coal feeder rotates along with the belt, enters a coal dropping pipe between the coal feeder and the coal mill, enters the coal mill, and the coal feeder weighing device completes the measurement of the real-time coal amount in the conveying process. Coal entering the coal mill falls on the middle part of the grinding disc, enters the space between the grinding disc and the grinding roller along with the rotation of the coal mill and is ground into coal powder, primary air carries the coal powder to enter a dynamic separator at the top of the coal mill, the coal powder with qualified separation fineness is sent into a hearth, unqualified coal powder returns to the grinding disc to be continuously ground, and sundries which cannot be ground are discharged from a slag discharge inlet.
The control of the outlet temperature of the coal mill is very important, and not only is enough drying output capacity ensured, but also the requirement of boiler combustion is met; the safety of the operation of the coal mill is ensured, and the coal mill is prevented from firing and exploding. Current control of coal mill outlet temperature may include automatic regulation. The automatic regulating system forms a control instruction through the PID regulator according to the deviation of the measured actual temperature value and a set value, and realizes that the outlet temperature of the coal mill is stabilized at the set value by regulating the opening degree of the cold flue gas regulating valve. Specifically, the automatic regulating system needs to obtain a control parameter, namely the actual temperature of the outlet of the coal mill, for the measurement of the actual temperature of the outlet of the coal mill, three temperature measuring points are generally adopted, and the median value of the measured values of the three temperature measuring points is taken as the measured actual temperature. The measured actual temperature is compared with the set temperature and an adjustment is made if there is a deviation. In the operation of the boiler unit, the set value of the outlet temperature of the coal mill can be manually set by an operator and automatically adjusted by a cold flue gas adjusting valve, and the control relationship is as follows:
Vcold＝PID(tsp,tpv)
wherein, VcoldIndicating the opening of the cold flue gas regulating valve, tspIndicating coal mill outlet set temperature, tpvRepresenting the actual temperature at the outlet of the coal mill.
Because the power grid requires that the unit has a sufficiently fast load change rate, the increase and decrease of the coal amount of the coal mill are correspondingly accelerated, the process inevitably causes great disturbance to the outlet temperature, and the condition that the single-loop PID control cannot be adjusted possibly occurs, so that the tripping operation is triggered due to the over-limit protection of the equipment temperature; meanwhile, the operator needs to monitor the temperature condition, and if the operator does not operate properly, the protection action will occur.
Considering that if a feedforward action is added in a PID control loop, the influence of the coal quantity on the outlet temperature of the coal mill and the influence of the opening of a hot air regulating valve on the outlet temperature of the coal mill are respectively determined, so that when the outlet temperature of the coal mill is controlled by regulating the opening of a cold flue gas regulating valve through the PID control loop, the outlet temperature of the coal mill can be controlled only according to the difference between the actual outlet temperature of the coal mill and a set value, and the opening of the cold flue gas regulating valve can be regulated according to the coal quantity and the opening of the hot air regulating valve, thereby controlling the outlet temperature of the coal mill, and the problem that the condition that the single-loop PID control in the prior art is possibly not regulated is solved, the fluctuation range of the outlet temperature of the coal mill is reduced, the stability of. Based on the above, the embodiments of the present specification provide a coal mill outlet temperature adjusting method, device and storage medium.
According to the method provided by the embodiment of the specification, the opening degree of the cold flue gas regulating valve can be adjusted to be matched with the coal quantity in the coal mill and the opening degree of the hot air regulating valve, so that the outlet temperature of the coal mill is stabilized at the set target temperature.
The method provided by the embodiment of the specification is suitable for controlling the outlet temperature of the fan type coal mill. Of course, the coal mill outlet temperature adjusting method is also applicable to the control of the outlet temperature of various coal mills of other types, which are not listed here. In addition, it should be noted that: the invention can also be applied to a distributed control system DCS and a field bus control system FCS.
Fig. 1 is a flowchart illustrating a method for adjusting the outlet temperature of a coal pulverizer according to an embodiment of the present disclosure. In the embodiment of the present specification, the main body for executing the coal mill outlet temperature adjusting method may be an electronic device having a logic operation function, the electronic device may be a server, and the server may be an electronic device having a certain operation processing capability. Which may have a processor and memory, etc. Of course, the server is not limited to the electronic device having a certain entity, and may be software running in the electronic device. The server may also be a distributed server, which may be a system with multiple processors, memory, etc. operating in coordination. Alternatively, the server may also be a server cluster formed by several servers. The method may include the following steps.
S110: disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factor is a factor influencing the outlet temperature of the coal mill.
In some embodiments, the control factor is a factor that affects the coal mill outlet temperature. The control factors may include the amount of coal, the opening degree of the hot air adjusting valve, and the like. And the opening degree of the hot air regulating valve is used for controlling the outlet oxygen amount of the coal mill.
In some embodiments, the outlet temperature of the coal mill under different coal amounts can be obtained by adding or subtracting the coal amount disturbance; and determining the influence of the coal quantity on the outlet temperature of the coal mill according to the corresponding outlet temperature of the coal mill under different coal quantities. Specifically, the coal quantity can be adjusted under the condition that other control factors are unchanged, coal mill outlet temperatures under different coal quantities are obtained, the coal mill outlet temperatures under different coal quantities are fitted, and the relationship between the coal quantity and the coal mill outlet temperatures is obtained: m ═ f (t). Wherein M represents the coal quantity and T represents the outlet temperature of the coal mill. The influence of the coal quantity on the outlet temperature of the coal mill can be determined according to the relation between the coal quantity and the outlet temperature of the coal mill.
In some embodiments, the opening degree of the hot air adjusting valve can be adjusted to perform disturbance, so that the outlet temperature of the coal mill under different opening degrees of the hot air adjusting valve can be obtained; according to the difference of the hot air regulating valveAnd determining the influence of the opening degree of the hot air regulating valve on the outlet temperature of the coal mill according to the outlet temperature of the coal mill under the opening degree. Specifically, can adjust the aperture of hot air adjusting valve under the unchangeable circumstances of other control factors to obtain the coal pulverizer outlet temperature of hot air adjusting valve under different apertures, carry out the fitting to the coal pulverizer outlet temperature of hot air adjusting valve under different apertures, obtain the aperture of hot air adjusting valve and the relation of coal pulverizer outlet temperature: vhotF (t). Wherein, VhotThe opening degree of the hot air regulating valve is shown, and T represents the outlet temperature of the coal mill. The influence of the opening degree of the hot air adjusting valve on the outlet temperature of the coal mill can be determined according to the relation between the opening degree of the hot air adjusting valve and the outlet temperature of the coal mill.
In some embodiments, since the load of the generator set is changed frequently, in order to meet the adjustment of the outlet temperature of the coal mill under different loads of the generator set, the influence of the states of the control factors on the outlet temperature of the coal mill under different loads of the generator set can be obtained. Specifically, the outlet temperature of the coal mill under different coal quantities can be obtained by adding or subtracting the coal quantity disturbance under different loads of the generator set; and determining the influence of the coal amount of the generator set under different loads on the outlet temperature of the coal mill according to the corresponding outlet temperature of the coal mill under different coal amounts. The opening degree of the hot air adjusting valve can be adjusted to disturb under different loads of the generator set, so that the outlet temperature of the coal mill under different opening degrees of the hot air adjusting valve can be obtained; and determining the influence of the opening of the hot air regulating valve on the outlet temperature of the coal mill under different loads of the generator set according to the outlet temperature of the coal mill under different openings of the hot air regulating valve.
S120: and under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill.
In some embodiments, the cold flue gas regulating valve is a control mechanism for regulating the outlet temperature of the coal mill, and the opening degree of the cold flue gas regulating valve is regulated to control the air volume of cold air entering the coal mill, so that the purpose of controlling the outlet temperature of the coal mill is achieved.
In some embodiments, the controlling the opening degree of the cold flue gas regulating valve to regulate the coal mill outlet temperature, and obtaining the first function representing the relationship between the opening degree of the cold flue gas regulating valve and the coal mill outlet temperature may include: controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining the outlet temperature of the coal mill under different opening degrees of the cold flue gas regulating valve; and fitting the coal mill outlet temperature under different opening degrees of the cold flue gas regulating valve to obtain a first function representing the relation between the opening degree of the cold flue gas regulating valve and the coal mill outlet temperature. Specifically, the first function may be represented as: vcoldF (t). Wherein, VcoldThe opening degree of the cold flue gas regulating valve is shown, and T represents the outlet temperature of the coal mill.
S130: and determining a second function representing the relationship among the state of the control factor, the coal mill outlet temperature and the opening degree of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function.
In some embodiments, a second function characterizing a state of the control factor, a coal mill outlet temperature, and an opening relationship of a cold flue gas damper valve may be determined based on the effect of the control factor on the coal mill outlet temperature and the first function. Specifically, the relationship between the coal amount and the coal mill outlet temperature M ═ f (t), and the relationship between the opening degree of the hot blast adjusting valve and the coal mill outlet temperature V may be set tohot(t) and said first function VcoldF (T), and obtaining a second function V representing the relation among the state of the control factor, the outlet temperature of the coal mill and the opening degree of the cold flue gas regulating valvecold＝f(T,Vcold,M)。
In some embodiments, the second function may be further modified by a factor corresponding to the load, taking into account different loads of the motor unit. Specifically, a second function V representing the relationship among the state of the control factor, the outlet temperature of the coal mill and the opening degree of the cold flue gas regulating valve under different loads of the generator set can be determined based on the influence of the state of the control factor under different loads of the generator set on the outlet temperature of the coal mill and the first functioncold＝f(T,VcoldM, α). WhereinAnd alpha represents a coefficient corresponding to the load, and different loads of the generator set can correspond to different coefficients.
S140: and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree.
In some embodiments, the coal mill may be generally provided with a trip protection condition, and a trip may occur when the coal mill outlet temperature reaches the trip protection temperature. The preset value can be a certain value smaller than the tripping temperature, and the outlet temperature of the coal mill is controlled at the preset value, so that the normal operation of the coal mill can be ensured, and the stability and the efficiency of the coal mill are improved. In order to reduce the number of trips of the coal mill, the preset temperature range may be set to a certain range less than the trip temperature. For example, if the trip temperature is 80 degrees celsius, the predetermined temperature range may be 50-70 degrees celsius, and the predetermined temperature range may be 75 degrees celsius. Of course, the trip temperature, the preset temperature range and the preset value may take other values, which are not limited in the embodiment of the present specification. It should be noted that a certain space needs to be reserved between the upper limit of the preset temperature range and the trip temperature, for example, the difference between the trip temperature and the upper limit of the preset temperature range may be 5 degrees celsius, 10 degrees celsius, or the like.
In some embodiments, the coal mill outlet location may be provided with a temperature measurement device, which may be a temperature sensor, and the coal mill outlet temperature may be determined based on data detected by the temperature sensor. In some embodiments, the temperature measuring device may be a plurality of temperature measuring devices, and the measured value of the plurality of temperature measuring devices is averaged to be the measured actual temperature.
In some embodiments, in the case that the current outlet temperature of the coal mill is within the preset temperature range, the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is regulated to the preset value in the current state of the control factor can be calculated according to the second function, so as to facilitate the regulation according to the target opening degreeAnd regulating the outlet temperature of the coal mill by standard opening degree. Specifically, the second function V may be determined according to the known conditions of the current outlet temperature of the coal mill, the current state of the control factors such as the current coal amount, the current opening degree of the hot air adjusting valve, and the like, and according to the second function Vcold＝f(T,VcoldAnd M) calculating the target opening of the cold flue gas regulating valve. After the target opening degree is obtained, the opening degree of the cold flue gas regulating valve can be controlled to be the target opening degree, so that the outlet temperature of the coal mill can be regulated to a preset value.
In some embodiments, in consideration of different loads of the motor unit, the second function V may be further determined according to known conditions such as the current load of the motor unit, the current outlet temperature of the coal pulverizer, the current state of the control factor, such as the current amount of coal, the current opening degree of the hot air adjusting valve, and the likecold＝f(T,VcoldM, alpha) calculating the target opening of the cold flue gas regulating valve. After the target opening degree is obtained, the opening degree of the cold flue gas regulating valve can be controlled to be the target opening degree, so that the outlet temperature of the coal mill can be regulated to a preset value.
In some embodiments, if the current outlet temperature of the coal mill is greater than the upper limit value of the preset temperature range and approaches the trip temperature, the opening degree of the cold flue gas regulating valve can be adjusted in an emergency in order to rapidly reduce the outlet temperature of the coal mill. Specifically, under the condition that the current outlet temperature of the coal mill is larger than the upper limit value of the preset temperature range, the target opening degree of a cold flue gas regulating valve when the outlet temperature of the coal mill is regulated to the preset temperature range can be calculated according to the first function, so that the outlet temperature of the coal mill can be regulated according to the target opening degree.
In some embodiments, if the current outlet temperature of the coal mill is too low and is less than the lower limit value of the preset temperature range, it may be that the oxygen amount at the outlet of the coal mill is too low, so that the opening degree of the hot air adjusting valve may be adjusted to raise the outlet temperature of the coal mill to within the preset temperature range, and then the target opening degree of the cold flue gas adjusting valve is calculated according to the second function when the outlet temperature of the coal mill is adjusted to the preset value in the current state of the control factor, so as to adjust the outlet temperature of the coal mill according to the target opening degree.
According to the method for adjusting the outlet temperature of the coal mill, provided by the embodiment of the specification, disturbance can be applied to the state of the control factor, and the influence of the state of the control factor on the outlet temperature of the coal mill is obtained; the control factors are factors influencing the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree. The method provided by the embodiment of the specification can be adjusted only according to the difference between the actual outlet temperature of the coal mill and the set value, and can also be adjusted according to the state of the control factor, so that the outlet temperature of the coal mill is controlled.
Referring to fig. 2, the present specification further provides a coal mill outlet temperature adjusting device, which may specifically include the following structural modules.
An obtaining module 210, configured to apply disturbance to a state of the control factor to obtain an influence of the state of the control factor on a coal mill outlet temperature; the control factors are factors influencing the outlet temperature of the coal mill;
the control module 220 is configured to control the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal pulverizer under the condition that the state of the control factor is not changed, so as to obtain a first function representing the relationship between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal pulverizer;
a determining module 230, configured to determine, based on the first function and an influence of the control factor on the coal mill outlet temperature, a second function representing a relationship among a state of the control factor, the coal mill outlet temperature, and an opening degree of the cold flue gas regulating valve;
and the adjusting module 240 is configured to, under the condition that the current outlet temperature of the coal mill is within the preset temperature range, calculate the current state of the control factor according to the second function, and adjust the target opening of the cold flue gas adjusting valve when the outlet temperature of the coal mill is a preset value, so as to adjust the outlet temperature of the coal mill according to the target opening.
The present specification also provides a computer readable storage medium of a coal mill outlet temperature adjusting method, the computer readable storage medium storing computer program instructions, which when executed, implement: disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree.
In the embodiments of the present disclosure, the storage medium includes, but is not limited to, a Random Access Memory (RAM), a Read-Only Memory (ROM), a Cache (Cache), a Hard Disk Drive (HDD), or a Memory Card (Memory Card). The memory may be used for storing the computer programs and/or modules, and the memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the user terminal, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory. In the embodiments of the present description, the functions and effects specifically realized by the program instructions stored in the computer-readable storage medium may be explained in contrast to other embodiments, and are not described herein again.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and the same or similar parts in each embodiment may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, as for the apparatus embodiment and the apparatus embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and reference may be made to some descriptions of the method embodiment for relevant points.
After reading this specification, persons skilled in the art will appreciate that any combination of some or all of the embodiments set forth herein, without inventive faculty, is within the scope of the disclosure and protection of this specification.
In the 90 s of the 20 th century, improvements in a technology could clearly distinguish between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually making an Integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Language Description Language), traffic, pl (core unified Programming Language), HDCal, JHDL (Java Hardware Description Language), langue, Lola, HDL, laspam, hardbyscript Description Language (vhr Description Language), and vhjhd (Hardware Description Language), which is currently used by most popular version-software. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
From the above description of the embodiments, it is clear to those skilled in the art that the present specification can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solutions of the present specification may be essentially or partially implemented in the form of software products, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and include instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments of the present specification.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The description is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
This description may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
While the specification has been described with examples, those skilled in the art will appreciate that there are numerous variations and permutations of the specification that do not depart from the spirit of the specification, and it is intended that the appended claims include such variations and modifications that do not depart from the spirit of the specification.
Claims (10)
1. A coal mill outlet temperature adjustment method, characterized in that the method comprises:
disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill;
under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill;
determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function;
and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree.
2. The method of claim 1, wherein the control factors include a quantity of coal and an opening degree of a hot air adjusting valve; and the opening degree of the hot air regulating valve is used for controlling the outlet oxygen amount of the coal mill.
3. The method of claim 1, wherein the perturbing the state of the control factor, and obtaining the effect of the state of the control factor on the coal mill outlet temperature comprises:
obtaining coal mill outlet temperatures under different coal quantities by adding and subtracting coal quantity disturbance;
and determining the influence of the coal quantity on the outlet temperature of the coal mill according to the corresponding outlet temperature of the coal mill under different coal quantities.
4. The method of claim 1, wherein the perturbing the state of the control factor, and obtaining the effect of the state of the control factor on the coal mill outlet temperature comprises:
disturbing by adjusting the opening degree of the hot air adjusting valve to obtain the outlet temperature of the coal mill under different opening degrees of the hot air adjusting valve;
and determining the influence of the opening degree of the hot air regulating valve on the outlet temperature of the coal mill according to the outlet temperature of the coal mill under different opening degrees of the hot air regulating valve.
5. The method of claim 1, wherein controlling the opening of the cold flue gas regulating valve to regulate the coal mill outlet temperature, and wherein obtaining the first function indicative of the opening of the cold flue gas regulating valve versus the coal mill outlet temperature comprises:
controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining the outlet temperature of the coal mill under different opening degrees of the cold flue gas regulating valve;
and fitting the coal mill outlet temperature under different opening degrees of the cold flue gas regulating valve to obtain a first function representing the relation between the opening degree of the cold flue gas regulating valve and the coal mill outlet temperature.
6. The method of claim 1, further comprising:
acquiring the influence of the states of control factors on the outlet temperature of the coal mill under different loads of the generator set;
correspondingly, determining a second function representing the relationship among the state of the control factor, the outlet temperature of the coal mill and the opening degree of the cold flue gas regulating valve under different loads of the generator set on the basis of the influence of the state of the control factor under different loads of the generator set on the outlet temperature of the coal mill and the first function; and under the condition that the current outlet temperature of the coal mill is in a preset temperature range, calculating the current state of the control factor and the current load of the generator set according to the second function, and adjusting the target opening of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening.
7. The method of claim 1, further comprising
And under the condition that the current outlet temperature of the coal mill is greater than the upper limit value of a preset temperature range, calculating the target opening degree of a cold flue gas regulating valve when the outlet temperature of the coal mill is regulated to the preset temperature range according to the first function so as to regulate the outlet temperature of the coal mill according to the target opening degree.
8. The method of claim 1, wherein the adjusting the coal mill outlet temperature as a function of the target opening degree comprises:
and controlling the opening degree of the cold flue gas regulating valve to be the target opening degree so as to regulate the outlet temperature of the coal mill to a preset value.
9. A coal mill outlet temperature adjustment device, the device comprising:
the obtaining module is used for applying disturbance to the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill;
the control module is used for controlling the opening of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill under the condition that the state of the control factor is unchanged, so as to obtain a first function representing the relation between the opening of the cold flue gas regulating valve and the outlet temperature of the coal mill;
the determining module is used for determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function;
and the adjusting module is used for calculating the target opening of the cold flue gas adjusting valve when the outlet temperature of the coal mill is adjusted to be a preset value according to the second function under the condition that the current outlet temperature of the coal mill is within a preset temperature range, so that the outlet temperature of the coal mill can be adjusted according to the target opening.
10. A computer readable storage medium having computer instructions stored thereon that when executed perform: disturbing the state of the control factor to obtain the influence of the state of the control factor on the outlet temperature of the coal mill; the control factors are factors influencing the outlet temperature of the coal mill; under the condition that the state of the control factor is not changed, controlling the opening degree of the cold flue gas regulating valve to regulate the outlet temperature of the coal mill, and obtaining a first function representing the relation between the opening degree of the cold flue gas regulating valve and the outlet temperature of the coal mill; determining a second function representing the state of the control factor, the coal mill outlet temperature and the opening relation of the cold flue gas regulating valve based on the influence of the control factor on the coal mill outlet temperature and the first function; and under the condition that the current outlet temperature of the coal mill is within a preset temperature range, calculating the current state of the control factor according to the second function, and adjusting the target opening degree of the cold flue gas regulating valve when the outlet temperature of the coal mill is adjusted to be a preset value so as to adjust the outlet temperature of the coal mill according to the target opening degree.
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