CN111306536A - Method and device for controlling sulfur dioxide emission of circulating fluidized bed boiler - Google Patents
Method and device for controlling sulfur dioxide emission of circulating fluidized bed boiler Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2206/00—Fluidised bed combustion
- F23C2206/10—Circulating fluidised bed
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Abstract
The invention discloses a method and a device for controlling sulfur dioxide emission of a circulating fluidized bed boiler, which are used for solving the problem of poor effect of controlling sulfur dioxide emitted by the circulating fluidized bed boiler in the prior art. The scheme provided by the application comprises the following steps: acquiring operation parameters of the circulating fluidized bed boiler, and determining a feedforward control instruction according to the sulfur dioxide emission standard value and the operation parameters, wherein the feedforward control instruction comprises a neutralizer supply amount feedforward control instruction; and introducing the neutralizing agent into the circulating fluidized bed boiler according to a feeding amount feedforward control instruction of the neutralizing agent. The scheme can realize automatic control on the sulfur dioxide amount discharged by the circulating fluidized bed boiler, realize advanced control through a feedforward control instruction, ensure that the sulfur dioxide discharge amount of the circulating fluidized bed boiler does not exceed the standard, and is favorable for environmental protection and emission reduction. This scheme can automatic control sulfur dioxide emission, need not artifical regulation and control, reduces manpower resources and consumes.
Description
Technical Field
The invention relates to the field of automation, in particular to a method and a device for controlling sulfur dioxide emission of a circulating fluidized bed boiler.
Background
The industrial industry in China develops rapidly, and the environmental pollution problem caused by the industrial development cannot be seen. A circulating fluidized bed boiler is an energy conversion device that emits harmful gases including sulfur dioxide during operation. Due to the reasons of large hearth, long pipeline, variable coal types and the like of the circulating fluidized bed boiler, the effective control of sulfur dioxide discharged by the circulating fluidized bed boiler is difficult to realize in the prior art.
How to control the sulfur dioxide discharge amount of the circulating fluidized bed boiler is the technical problem to be solved by the application.
Disclosure of Invention
The embodiment of the application aims to provide a method and a device for controlling the emission of sulfur dioxide of a circulating fluidized bed boiler, which are used for solving the problem of poor effect of controlling the sulfur dioxide emitted by the circulating fluidized bed boiler in the prior art.
In a first aspect, a method for controlling sulfur dioxide emission from a circulating fluidized bed boiler is provided, comprising:
obtaining operating parameters of a circulating fluidized bed boiler, the operating parameters including at least one of: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
determining a feed-forward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feed-forward control instruction comprises a neutralizer supply feed-forward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
and introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
In a second aspect, there is provided a sulfur dioxide emission control device for a circulating fluidized bed boiler, comprising:
the acquisition module acquires operating parameters of the circulating fluidized bed boiler, wherein the operating parameters comprise at least one of the following parameters: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
the determination module is used for determining a feedforward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feedforward control instruction comprises a neutralizer supply amount feedforward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
and the control module is used for introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
In a third aspect, an electronic device is provided, including:
a processor; and
a memory arranged to store computer executable instructions that, when executed, cause the processor to:
obtaining operating parameters of a circulating fluidized bed boiler, the operating parameters including at least one of: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
determining a feed-forward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feed-forward control instruction comprises a neutralizer supply feed-forward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
and introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
In a fourth aspect, a computer-readable storage medium is presented, the computer-readable storage medium storing one or more programs that, when executed by an electronic device that includes a plurality of application programs, cause the electronic device to:
obtaining operating parameters of a circulating fluidized bed boiler, the operating parameters including at least one of: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
determining a feed-forward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feed-forward control instruction comprises a neutralizer supply feed-forward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
and introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
In the embodiment of the application, the operation parameters of the circulating fluidized bed boiler are obtained, the feedforward control instruction is determined according to the standard value of the emission of sulfur dioxide and the operation parameters, and the neutralizer is introduced into the circulating fluidized bed boiler according to the feedforward control instruction of the supply amount of the neutralizer. In the scheme, the feedforward control instruction is determined according to the standard value and the operating parameters of the sulfur dioxide emission, so that the determined feedforward control instruction accords with the actual operating condition of the circulating fluidized bed boiler and can accord with the standard of the sulfur dioxide emission. And then, the circulating fluidized bed boiler is controlled to operate according to the feedforward control instruction, so that the effective control on the discharge amount of sulfur dioxide can be realized, the advanced control is realized, and the control lag problem caused by large hearth and the like is avoided. Under the condition that the amount of generated sulfur dioxide fluctuates, the supply amount of the neutralizer can be increased under the condition that the emission amount of the sulfur dioxide possibly rises, the fluctuation of the emission amount of the sulfur dioxide is relieved, and the emission amount of the sulfur dioxide is prevented from exceeding the standard. In addition, through this scheme ability automatic control sulfur dioxide emission, need not artifical regulation and control, reduce manpower resources consumption.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow diagram of a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 2 is a second schematic flow chart of a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 3 is a third schematic flow diagram illustrating a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 4 is a fourth schematic flow chart of a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 5 is a fifth schematic flow chart of a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 6 is a sixth schematic flow chart of a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 7 is a seventh schematic flow chart of a method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a control strategy according to an embodiment of the present invention;
FIG. 9 is a schematic view of the sulfur dioxide emission control device of a circulating fluidized bed boiler according to the present application.
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 some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The reference numbers in the present application are only used for distinguishing the steps in the scheme and are not used for limiting the execution sequence of the steps, and the specific execution sequence is described in the specification.
In recent years, a circulating fluidized bed boiler has been widely used in industrial production as an environment-friendly boiler. The circulating fluidized bed boiler can generate sulfur dioxide SO in operation2If the air is directly discharged into the air, air pollution is caused, and the natural environment is damaged. Therefore, how to control the amount of sulfur dioxide discharged from the circulating fluidized bed boiler is the prior artThere is a need for a solution.
In order to solve the problems in the prior art, the present application provides a method for controlling sulfur dioxide emission of a circulating fluidized bed boiler, as shown in fig. 1, comprising the following steps:
s11: obtaining operating parameters of a circulating fluidized bed boiler, the operating parameters including at least one of: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
s12: determining a feed-forward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feed-forward control instruction comprises a neutralizer supply feed-forward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
s13: and introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
In the embodiment of the present application, the circulating fluidized bed boiler may be a 600MW supercritical circulating fluidized bed unit, the circulating fluidized bed boiler may use coal as a raw material, and the raw material supply amount in the operation parameter may specifically be a coal supply amount. The neutralizing agent may be used to neutralize sulfur dioxide produced by the circulating fluidized bed boiler, and may be, for example, limestone. In practical application, the neutralization can be carried out by adopting a process of calcium spraying and desulfurization in a furnace, the calcium spraying process in the furnace directly adds limestone powder into the furnace to carry out chemical reaction with sulfur dioxide generated by combustion to generate calcium sulfate for solidification, and thus the effect of removing the sulfur dioxide generated by combustion is achieved.
For a high-power circulating fluidized bed boiler, the problems of large hearth, long adding pipeline of a neutralizer, variable combustion coal types, back sulfur dioxide measuring points, long combustion reaction time and the like are solved. If the limestone is introduced for neutralization control after the sulfur dioxide content is measured to exceed the standard, the amount of the discharged sulfur dioxide can be reduced after a period of time, so that the sulfur dioxide discharge amount adjustment has the characteristics of delay and delay.
In addition, due to the reasons of multiple combustion coal types, uneven coal mixing, unsmooth blanking and the like, the amount of sulfur dioxide generated by the circulating fluidized bed boiler fluctuates, so that the control of the sulfur dioxide emission is difficult, and the condition of excessive sulfur dioxide emission occasionally occurs.
In the embodiment of the present application, the obtaining of the operation parameters of the circulating fluidized bed boiler in step S11 specifically includes at least one of the following: raw material supply, rate of change of sulfur dioxide emission, bed temperature.
Wherein the raw material supply is directly related to the sulfur dioxide production. When the circulating fluidized bed boiler is operated at a high power, the raw material supply amount is often required to be increased, and when the circulating fluidized bed boiler is operated at a low power, the raw material supply amount is required to be decreased, and sulfur dioxide generated during the operation is also changed along with the change of the raw material supply amount. In the present embodiment, when the acquired operation parameters of the circulating fluidized bed boiler include the raw material supply amount, it is possible to estimate the change of the sulfur dioxide generation of the circulating fluidized bed boiler based on the raw material supply amount. Subsequently, a feed forward control command is determined in step S12, and a neutralizing agent is introduced into the circulating fluidized bed boiler according to the feed forward control command in step S13. So that the amount of the neutralizing agent is increased in time after the raw material supply amount is increased and before the amount of the sulfur dioxide discharged by the circulating fluidized bed boiler is increased, thereby achieving the effect of feed-forward control.
The rate of change in the amount of emission of sulfur dioxide obtained in step S11 may be a rate of change in the amount of emission of sulfur dioxide generated by calculation after a plurality of emissions of sulfur dioxide are measured over a preset period of time. The sulfur dioxide emission trend can be known according to a plurality of sulfur dioxide emission values measured in a preset time period. Under the condition that the introduced neutralizing agent is not changed, when the change rate of the sulfur dioxide discharge amount is a positive value, the sulfur dioxide amount generated by the circulating fluidized bed boiler is gradually increased, and the sulfur dioxide can be neutralized by increasing the introduction amount of the neutralizing agent. The feed forward control command is determined in step S12, and a neutralizing agent is introduced into the circulating fluidized bed boiler according to the feed forward control command in step S13. Through the feed-forward of the change rate of the discharge amount of the sulfur dioxide, the amount of the introduced neutralizing agent can be increased in time after the amount of the sulfur dioxide generated by the circulating fluidized bed boiler is increased and before the sulfur dioxide discharged by the circulating fluidized bed boiler exceeds the standard, so that the feed-forward control effect is achieved.
The bed temperature obtained in step S11 may be the temperature in the furnace of the circulating fluidized bed boiler, and since the amount of sulfur dioxide precipitated from coal at different temperatures is different, the amount of sulfur dioxide produced by the circulating fluidized bed boiler at different temperatures is different. The amount of sulfur dioxide separated out from the coal can be deduced according to the obtained bed temperature, and then the amount of sulfur dioxide generated by the circulating fluidized bed boiler is deduced, then a feed-forward control instruction is determined in step S12, and then a neutralizing agent is introduced into the circulating fluidized bed boiler according to the feed-forward control instruction in step S13. Therefore, the amount of the introduced neutralizing agent is adjusted in time before the discharged sulfur dioxide exceeds the standard, so as to achieve the effect of feedforward control.
In step S12 of the embodiment of the present application, a feed-forward control command is determined according to the standard value of the emission of sulfur dioxide and the operation parameter. Wherein, the standard value of the sulfur dioxide emission can be set according to national standard, for example, when the circulating fluidized bed boiler is a 600MW supercritical circulating fluidized bed unit, the national standard of the sulfur dioxide emission is not more than 400mg/Nm3. The standard value of the emission of sulfur dioxide can be equal to or lower than the national standard of the emission of sulfur dioxide.
According to the scheme provided by the embodiment of the application, the feed amount of coal is introduced to control and feed forward limestone. The change of the coal feeding amount inevitably causes the change of the sulfur dioxide amount generated by the circulating fluidized bed boiler, and when the unit rises and falls in load, the coal feeding amount correspondingly changes, so that the generated flow of the sulfur dioxide also changes. The embodiment introduces the feed coal amount change feedforward, realizes the timely adjustment of the limestone amount in advance, effectively inhibits the sulfur dioxide discharged by the circulating fluidized bed boiler from greatly fluctuating, and reduces the overshoot risk of the system.
In the scheme of the embodiment of the application, the feedforward control instruction is determined according to the standard value of the emission of the sulfur dioxide and the operation parameter, so that the determined feedforward control instruction accords with the actual operation condition of the circulating fluidized bed boiler and can accord with the emission standard of the sulfur dioxide. And then, the circulating fluidized bed boiler is controlled to operate according to the feedforward control instruction, so that the effective control on the discharge amount of sulfur dioxide can be realized, the advanced control is realized, and the control lag problem caused by large hearth and the like is avoided. Under the condition that the amount of generated sulfur dioxide fluctuates, the supply amount of the neutralizer can be increased under the condition that the emission amount of the sulfur dioxide possibly rises, the fluctuation of the emission amount of the sulfur dioxide is relieved, and the emission amount of the sulfur dioxide is prevented from exceeding the standard. In addition, through this scheme ability automatic control sulfur dioxide emission, need not artifical regulation and control, reduce manpower resources consumption. When the circulating fluidized bed boiler operates at low load, the amount of generated sulfur dioxide is less, the amount of the introduced neutralizing agent can be automatically reduced through the scheme provided by the embodiment, and the resource waste is avoided.
Based on the solution provided by the above embodiment, preferably, the operation parameters further include a supply amount of a neutralizing agent and a change rate of an emission amount of sulfur dioxide, and the determining a feed-forward control command according to a standard value of the emission amount of sulfur dioxide and the operation parameters, as shown in fig. 2, includes the following steps:
s21: determining a raw material supply variation according to the raw material supply amount;
s22: determining a supply variation of the neutralizer according to the supply variation of the raw material and the supply amount of the neutralizer;
s23: and determining the feeding amount feedforward control command of the neutralizing agent according to the supply variable amount of the neutralizing agent.
Generally, the amount of sulfur dioxide discharged is substantially stable and less than or equal to the standard value of sulfur dioxide emission without changing the feed amount of raw material and the feed amount of neutralizing agent of the circulating fluidized bed boiler. When the power of the circulating fluidized bed boiler is changed, the raw material supply amount is changed accordingly. The amount of change in the raw material supply is determined based on the raw material supply amount in step S21, and the change in the amount of sulfur dioxide generated by the circulating fluidized bed boiler can be obtained. For example, a positive change in the feedstock supply indicates an increase in the amount of coal supplied and an increase in the amount of sulfur dioxide produced. Subsequently, in step S22, since the raw material supply variation amount, based on the acquired neutralizer supply amount, the neutralizer supply variation amount may be determined. Subsequently, in step S23, the neutralizer supply feed-forward control command is determined in accordance with the neutralizer supply variation amount.
According to the scheme provided by the embodiment, when the raw material supply amount of the circulating fluidized bed boiler changes, a feedforward control command for adjusting the supply amount of the neutralizing agent can be generated. Therefore, when the amount of sulfur dioxide generated by the circulating fluidized bed boiler changes, the corresponding neutralizer is introduced to neutralize the generated sulfur dioxide, the excessive amount of the discharged sulfur dioxide is avoided, and the fluctuation of the amount of the discharged sulfur dioxide is slowed down.
Based on the solutions provided in the above embodiments, preferably, the operation parameter includes a change rate of the emission amount of sulfur dioxide, and the feedforward control command is determined according to the standard value of the emission amount of sulfur dioxide and the operation parameter, as shown in fig. 3, including the following steps:
s31: determining the emission trend of sulfur dioxide according to the change rate of the emission of sulfur dioxide;
s32: and determining the feed-forward control instruction of the supply amount of the neutralizer according to the standard value of the sulfur dioxide emission and the sulfur dioxide emission trend.
In the scheme provided by the embodiment, the change rate of the emission of sulfur dioxide is a parameter for representing the speed of rising or falling of the emission of sulfur dioxide. Firstly, determining the sulfur dioxide emission trend according to the change rate of the sulfur dioxide emission, if the change rate of the sulfur dioxide emission is a positive value, determining that the sulfur dioxide emission is an ascending trend, and in the next period of time, the sulfur dioxide emission is likely to continue to ascend. Specifically, the gradual narrowing of the change rate represents that the rising curve of the sulfur dioxide emission amount becomes slow, and the addition amount of limestone should be gradually reduced; the gradual amplification of the change rate represents that the rising curve of the sulfur dioxide is fast, and the input amount of the limestone should be gradually increased. And then determining the supply amount of the neutralizing agent according to the sulfur dioxide emission trend and the sulfur dioxide emission standard, and further determining a feed-forward control instruction of the supply amount of the neutralizing agent.
Through the scheme that this embodiment provided, can confirm sulfur dioxide discharge trend according to the sulfur dioxide emission volume change rate, and then adjust neutralizer supply volume through feedforward control instruction to reach the effect that realizes effective control before sulfur dioxide discharges and exceeds standard.
Based on the solution provided by the above embodiment, preferably, the operation parameters further include a supply amount of a neutralizing agent, and the feed-forward control command is determined according to a standard value of the emission of sulfur dioxide and the operation parameters, as shown in fig. 4, including the following steps:
s41: determining the molar ratio of calcium to sulfur according to the supply amount of the raw materials and the supply amount of the neutralizing agent;
s42: determining the ratio of the feed amount of the feed-forward neutralizer raw material to the feed amount of the feed-forward raw material according to a sulfur dioxide emission standard value, the calcium-sulfur molar ratio and a preset calcium-sulfur molar ratio standard;
s43: and determining the feed-forward control command of the raw material supply amount and the feed-forward control command of the neutralizer supply amount according to the ratio of the feed-forward raw material supply amount to the feed-forward raw material supply amount.
In the circulating fluidized bed boiler, the Ca/S molar ratio is increased, and the desulfurization efficiency is increased, and experiments show that the desulfurization efficiency is increased rapidly when the Ca/S molar ratio is lower than 2.5. At Ca/S molar ratios higher than 2.5, the desulfurization efficiency will continue to increase, but the increase is limited. In the scheme provided by the embodiment, a historical curve of the sulfur dioxide generation amount in a period of time, the coal feeding amount and the neutralizing agent reaction amount are obtained. And then estimating Ca/S of the later period of time according to the parameters, and determining a feed-forward control command to adjust the raw material supply amount and the neutralizing agent supply amount. Through the scheme provided by the embodiment of the application, the fluctuation condition of the sulfur dioxide discharged by the circulating fluidized bed boiler can be reduced, and the excessive sulfur dioxide discharge amount is avoided.
Based on the solution provided by the above embodiment, preferably, the operation parameter includes a bed temperature, and the feedforward control command is determined according to the standard value of the sulfur dioxide emission and the operation parameter, as shown in fig. 5, including the following steps:
s52: and determining the feed-forward control instruction of the supply amount of the neutralizing agent according to the standard value of the emission of sulfur dioxide and the precipitated amount of sulfur dioxide of the circulating fluidized bed boiler at the bed temperature.
In practical applications, the bed temperature of the circulating fluidized bed boiler is related to various factors, and can relate to parameters such as coal feeding amount and load. The amount of sulfur dioxide evolved varied at different temperatures. The bed temperature of the boiler can influence the desulfurization reaction speed, the precipitation amount of sulfur dioxide is in a monotonous increasing trend along with the temperature increase within a certain bed temperature range, the precipitation amount of sulfur dioxide at 750 ℃ is only 65.22% of that at 1150 ℃, the precipitation amount of sulfur dioxide at 850 ℃ is 91.88%, and the precipitation amount of SO2 at 950 ℃ is basically stable.
In the scheme provided by the embodiment, the sulfur dioxide precipitation amount can be determined according to the bed temperature in the operation parameters, so that the supply amount of the neutralizing agent is determined, the supply amount of the neutralizing agent is adjusted in time through a feedforward control instruction, and the excessive sulfur dioxide emission is avoided.
Based on the solution provided by the above embodiment, preferably, the feeding of the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control command of the neutralizing agent, as shown in fig. 6, includes the following steps:
s63: and introducing the neutralizing agent into the circulating fluidized bed boiler through a plurality of pipelines according to the feeding amount feedforward control instruction of the neutralizing agent.
In the solution provided in this embodiment, variable parameter processing may be performed according to the number of running feeders, for example, assuming that the limestone of my factory is composed of three feeding lines, the adjustment performance of the #1, #2, #3 feeding lines, the physical characteristics of the frequency converter, the feeder, and other devices, and summarizing may further optimize the adjustment parameters of the main SO2 regulator, and implement the regulator variable parameter adjustment for the running of each line.
Through the scheme provided by the embodiment, the condition that sulfur dioxide exceeds the standard due to blockage of the pipeline for introducing the neutralizing agent can be reduced by introducing the neutralizing agent into the circulating fluidized bed boiler through a plurality of pipelines. When one pipeline is blocked or has other faults, the introduction amount of other pipelines can be increased to neutralize the generated sulfur dioxide, the fluctuation of the amount of the discharged sulfur dioxide is reduced, and the excessive discharge of the sulfur dioxide is avoided.
Based on the solution provided by the above embodiment, preferably, before determining the feedforward control command according to the standard value of the sulfur dioxide emission and the operating parameter, as shown in fig. 7, the method further includes the following steps:
s71: obtaining a line pressure parameter for at least one line for introducing a neutralizing agent to the circulating fluidized bed boiler;
wherein, determining a feed forward control command according to a sulfur dioxide emission standard value and the operating parameter comprises:
s72: determining a neutralizer blanking time period in the neutralizer supply amount feedforward control instruction according to a sulfur dioxide emission standard value, the operation parameter and the pipeline pressure parameter;
wherein, according to the neutralizer supply feed-forward control instruction, the neutralizer is introduced into the circulating fluidized bed boiler, and the method comprises the following steps:
s73: and introducing a neutralizing agent into the circulating fluidized bed boiler through at least one pipeline according to the neutralizing agent blanking time period.
In the circulating fluidized bed boiler, unsmooth blanking of a limestone system and 'pipe blockage' of a limestone pipeline are important factors influencing timeliness and reliability of automatic adjustment response. In the scheme provided by the embodiment, the pipeline pressure for introducing the neutralizing agent is obtained, so that the blanking time period of the neutralizing agent is determined, and the situation of unsmooth blanking is reduced. In addition, the blanking of the neutralizer can be assisted through back blowing and auxiliary blowing, so that the reliability and timeliness of sulfur dioxide control and regulation are improved.
The scheme control strategy diagram provided by the embodiment of the application is shown in fig. 8, in the scheme provided by the embodiment, the operation parameters of the circulating fluidized bed boiler are obtained, the feed-forward control instruction is determined according to the standard value of the sulfur dioxide emission and the operation parameters, and the neutralizing agent is introduced into the circulating fluidized bed boiler according to the feed-forward control instruction of the supply amount of the neutralizing agent. In the scheme, the feedforward control instruction is determined according to the standard value and the operating parameters of the sulfur dioxide emission, so that the determined feedforward control instruction accords with the actual operating condition of the circulating fluidized bed boiler and can accord with the standard of the sulfur dioxide emission. And then, the circulating fluidized bed boiler is controlled to operate according to the feedforward control instruction, so that the effective control on the discharge amount of sulfur dioxide can be realized, the advanced control is realized, and the control lag problem caused by large hearth and the like is avoided. Under the condition that the amount of generated sulfur dioxide fluctuates, the supply amount of the neutralizer can be increased under the condition that the emission amount of the sulfur dioxide possibly rises, the fluctuation of the emission amount of the sulfur dioxide is relieved, and the emission amount of the sulfur dioxide is prevented from exceeding the standard. In addition, through this scheme ability automatic control sulfur dioxide emission, need not artifical regulation and control, reduce manpower resources consumption.
The scheme provided by the embodiment can be widely applied to various boiler systems, the automatic investment is good under the condition that the boiler combustion is stable, the monitoring pressure of operators is greatly reduced, and meanwhile, the average value of the sulfur dioxide discharge hours is close to the set value. The limestone adding amount can be adjusted in advance when the load of the unit is increased or decreased, and the purpose of controlling the pollutant emission not to exceed the standard is achieved. When the combustion structure of the boiler changes or the coal quality fluctuation is large, the control system can automatically move along the direction of the coal quality change, the overshoot is reduced, and the hourly average emission of sulfur dioxide is qualified. Through preliminary statistical analysis, the scheme provided by the embodiment can improve the automatic control input rate from 30% to 90%.
In order to solve the problems in the prior art, the embodiment of the present application provides a sulfur dioxide emission control device 90 of a circulating fluidized bed boiler, as shown in fig. 9, including:
an obtaining module 91 for obtaining operating parameters of the circulating fluidized bed boiler, the operating parameters including at least one of: the method comprises the following steps of (1) feeding amount of raw materials, feeding amount of a neutralizing agent, change rate of sulfur dioxide discharge amount and bed temperature, wherein the neutralizing agent is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
a determination module 92 for determining a feedforward control command according to the standard value of the sulfur dioxide emission and the operation parameter, wherein the feedforward control command comprises a feed amount feedforward control command of a neutralizer;
and the control module 93 is used for introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
In the embodiment of the application, the operation parameters of the circulating fluidized bed boiler are obtained, the feedforward control instruction is determined according to the standard value of the emission of sulfur dioxide and the operation parameters, and the neutralizer is introduced into the circulating fluidized bed boiler according to the feedforward control instruction of the supply amount of the neutralizer. In the scheme, the feedforward control instruction is determined according to the standard value and the operating parameters of the sulfur dioxide emission, so that the determined feedforward control instruction accords with the actual operating condition of the circulating fluidized bed boiler and can accord with the standard of the sulfur dioxide emission. And then, the circulating fluidized bed boiler is controlled to operate according to the feedforward control instruction, so that the effective control on the discharge amount of sulfur dioxide can be realized, the advanced control is realized, and the control lag problem caused by large hearth and the like is avoided. Under the condition that the amount of generated sulfur dioxide fluctuates, the supply amount of the neutralizer can be increased under the condition that the emission amount of the sulfur dioxide possibly rises, the fluctuation of the emission amount of the sulfur dioxide is relieved, and the emission amount of the sulfur dioxide is prevented from exceeding the standard. In addition, through this scheme ability automatic control sulfur dioxide emission, need not artifical regulation and control, reduce manpower resources consumption.
Based on the apparatus provided in the foregoing embodiment, preferably, the operation parameter further includes a supply amount of the neutralizing agent, and the determining module 92 is configured to:
determining a raw material supply variation according to the raw material supply amount;
determining a supply variation of the neutralizer according to the supply variation of the raw material and the supply amount of the neutralizer;
and determining the feeding amount feedforward control command of the neutralizing agent according to the supply variable amount of the neutralizing agent.
Based on the apparatus provided in the foregoing embodiment, preferably, the operation parameters include a raw material supply amount and a neutralization agent supply amount, and the determining module 92 is configured to:
determining the molar ratio of calcium to sulfur according to the supply amount of the raw materials and the supply amount of the neutralizing agent;
determining the ratio of the feed amount of the feed-forward neutralizer raw material to the feed amount of the feed-forward raw material according to a sulfur dioxide emission standard value, the calcium-sulfur molar ratio and a preset calcium-sulfur molar ratio standard;
and determining the feed-forward control command of the raw material supply amount and the feed-forward control command of the neutralizer supply amount according to the ratio of the feed-forward raw material supply amount to the feed-forward raw material supply amount.
Based on the apparatus provided in the foregoing embodiment, preferably, the operation parameter includes a rate of change of an emission amount of sulfur dioxide, and the determining module 92 is configured to:
determining the emission trend of sulfur dioxide according to the change rate of the emission of sulfur dioxide;
and determining the feed-forward control instruction of the supply amount of the neutralizer according to the standard value of the sulfur dioxide emission and the sulfur dioxide emission trend.
Based on the apparatus provided in the foregoing embodiment, preferably, the operation parameter includes a bed temperature, and the determining module 92 is configured to:
and determining the feed-forward control instruction of the supply amount of the neutralizing agent according to the standard value of the emission of sulfur dioxide and the precipitated amount of sulfur dioxide of the circulating fluidized bed boiler at the bed temperature.
Based on the apparatus provided in the foregoing embodiment, preferably, the control module 93 is configured to:
and introducing the neutralizing agent into the circulating fluidized bed boiler through a plurality of pipelines according to the feeding amount feedforward control instruction of the neutralizing agent.
Based on the apparatus provided in the foregoing embodiment, preferably, the obtaining module 91 is further configured to:
obtaining a line pressure parameter for at least one line for introducing a neutralizing agent to the circulating fluidized bed boiler;
the determination module 92 is configured to:
determining a neutralizer blanking time period in the neutralizer supply amount feedforward control instruction according to a sulfur dioxide emission standard value, the operation parameter and the pipeline pressure parameter;
the control module 93 is configured to:
and introducing the neutralizing agent into the circulating fluidized bed boiler through at least one pipeline according to the blanking period of the neutralizing agent.
Preferably, an embodiment of the present invention further provides a mobile terminal, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements each process of the above-mentioned embodiment of the method for controlling sulfur dioxide emissions from a circulating fluidized bed boiler, and can achieve the same technical effect, and in order to avoid repetition, the detailed description is omitted here.
The embodiment of the invention further provides a computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program realizes each process of the embodiment of the method for controlling sulfur dioxide emission of a circulating fluidized bed boiler, and can achieve the same technical effect, and is not repeated here to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for controlling sulfur dioxide emission of a circulating fluidized bed boiler is characterized by comprising the following steps:
obtaining operating parameters of a circulating fluidized bed boiler, the operating parameters including at least one of: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
determining a feed-forward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feed-forward control instruction comprises a neutralizer supply feed-forward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
and introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
2. The method of claim 1, wherein the operating parameters further include a supply of a neutralizing agent, and wherein determining a feed forward control command based on a sulfur dioxide emission standard value and the operating parameters comprises:
determining a raw material supply variation according to the raw material supply amount;
determining a supply variation of the neutralizer according to the supply variation of the raw material and the supply amount of the neutralizer;
and determining the feeding amount feedforward control command of the neutralizing agent according to the supply variable amount of the neutralizing agent.
3. The method of claim 2, wherein the operating parameters include a feed stock amount and a neutralizing agent amount, and wherein determining a feed forward control command based on a sulfur dioxide emission standard value and the operating parameters comprises:
determining the molar ratio of calcium to sulfur according to the supply amount of the raw materials and the supply amount of the neutralizing agent;
determining the ratio of the feed amount of the feed-forward neutralizer raw material to the feed amount of the feed-forward raw material according to a sulfur dioxide emission standard value, the calcium-sulfur molar ratio and a preset calcium-sulfur molar ratio standard;
and determining the feed-forward control command of the raw material supply amount and the feed-forward control command of the neutralizer supply amount according to the ratio of the feed-forward raw material supply amount to the feed-forward raw material supply amount.
4. The method of claim 1, wherein the operating parameter comprises a rate of change of sulfur dioxide emissions, and wherein determining a feed forward control command based on a standard value for sulfur dioxide emissions and the operating parameter comprises:
determining the emission trend of sulfur dioxide according to the change rate of the emission of sulfur dioxide;
and determining the feed-forward control instruction of the supply amount of the neutralizer according to the standard value of the sulfur dioxide emission and the sulfur dioxide emission trend.
5. The method of claim 1, wherein the operating parameter comprises a bed temperature, and wherein determining a feed forward control command based on a sulfur dioxide emission standard value and the operating parameter comprises:
and determining the feed-forward control instruction of the supply amount of the neutralizing agent according to the standard value of the emission of sulfur dioxide and the precipitated amount of sulfur dioxide of the circulating fluidized bed boiler at the bed temperature.
6. The method according to any one of claims 1 to 5, wherein feeding the neutralizing agent into the circulating fluidized bed boiler according to the neutralizing agent feed amount feed-forward control command comprises:
and introducing the neutralizing agent into the circulating fluidized bed boiler through a plurality of pipelines according to the feeding amount feedforward control instruction of the neutralizing agent.
7. The method according to any one of claims 1 to 5, wherein before determining the feed forward control command based on the standard value of the emission of sulfur dioxide and the operating parameter, further comprising:
obtaining a line pressure parameter for at least one line for introducing a neutralizing agent to the circulating fluidized bed boiler;
wherein, determining a feed forward control command according to a sulfur dioxide emission standard value and the operating parameter comprises:
determining a neutralizer blanking time period in the neutralizer supply amount feedforward control instruction according to a sulfur dioxide emission standard value, the operation parameter and the pipeline pressure parameter;
wherein, according to the neutralizer supply feed-forward control instruction, the neutralizer is introduced into the circulating fluidized bed boiler, and the method comprises the following steps:
and introducing the neutralizing agent into the circulating fluidized bed boiler through at least one pipeline according to the blanking period of the neutralizing agent.
8. A sulfur dioxide discharge control device of a circulating fluidized bed boiler, which is characterized in that,
the acquisition module acquires operating parameters of the circulating fluidized bed boiler, wherein the operating parameters comprise at least one of the following parameters: raw material supply amount, sulfur dioxide discharge amount change rate and bed temperature;
the determination module is used for determining a feedforward control instruction according to a sulfur dioxide emission standard value and the operation parameter, wherein the feedforward control instruction comprises a neutralizer supply amount feedforward control instruction, and the neutralizer is used for neutralizing sulfur dioxide generated by the circulating fluidized bed boiler;
and the control module is used for introducing the neutralizing agent into the circulating fluidized bed boiler according to the feeding amount feedforward control instruction of the neutralizing agent.
9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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