CN110906360A - Working condition control system and method and main control unit - Google Patents

Working condition control system and method and main control unit Download PDF

Info

Publication number
CN110906360A
CN110906360A CN201911193266.1A CN201911193266A CN110906360A CN 110906360 A CN110906360 A CN 110906360A CN 201911193266 A CN201911193266 A CN 201911193266A CN 110906360 A CN110906360 A CN 110906360A
Authority
CN
China
Prior art keywords
coal
powder
pulverizing
monitoring result
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911193266.1A
Other languages
Chinese (zh)
Other versions
CN110906360B (en
Inventor
安然
杨永强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anox Beijing Environmental Technology Co Ltd
Original Assignee
Anox Beijing Environmental Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anox Beijing Environmental Technology Co Ltd filed Critical Anox Beijing Environmental Technology Co Ltd
Priority to CN201911193266.1A priority Critical patent/CN110906360B/en
Publication of CN110906360A publication Critical patent/CN110906360A/en
Application granted granted Critical
Publication of CN110906360B publication Critical patent/CN110906360B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00Thermometers specially adapted for specific purposes
    • G01K13/02Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036Specially adapted to detect a particular component
    • G01N33/004Specially adapted to detect a particular component for CO, CO2
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004Gaseous mixtures, e.g. polluted air
    • G01N33/0009General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0062General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital
    • G01N33/0067General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method, e.g. intermittent, or the display, e.g. digital by measuring the rate of variation of the concentration

Abstract

The embodiment of the invention provides a working condition control system, a working condition control method and a main control unit, wherein the system comprises: a host and a master control room; the host is used for acquiring a data signal, and the data signal indicates the concentration value of CO gas in a primary air powder pipe of a powder making system; determining whether a monitoring result of safety risk exists in the powder making system according to the concentration value of the CO gas; sending the monitoring result to the master control room; and the main control unit of the main control room is used for controlling the working condition of the boiler when the monitoring result shows that the pulverizing system has no safety risk so as to improve the thermal efficiency of the boiler. The embodiment of the invention improves the thermal efficiency of the boiler under the condition of ensuring the safety of the pulverizing system.

Description

Working condition control system and method and main control unit
Technical Field
The embodiment of the invention relates to the technical field of thermal power generation, in particular to a working condition control system, a working condition control method and a main control unit.
Background
At present, thermal power generation is one of the main power supply modes, along with the continuous improvement of the automation level of the thermal power generation, all parts of a coal-fired unit need to be matched for operation, a powder preparation system and a boiler are used as important components of the coal-fired unit, and the powder preparation system realizes the thermal power generation by feeding pulverized coal into the boiler for combustion; the coal pulverizing system is a combination of equipment and connecting pipelines which are required for grinding raw coal into coal powder and then sending the coal powder into a boiler hearth for suspension combustion.
The safety accident of powder process system frequently appears among the thermal power at present, and the boiler leads to the boiler thermal efficiency to be lower (the coal-fired efficiency is lower owing to have to discharge fume heat loss and the heat loss of mechanical incomplete combustion simultaneously, specifically indicates that the boiler power generation coal consumption is great), consequently, how to improve boiler thermal efficiency under the condition of guaranteeing powder process system safety, becomes the problem that technical staff in the field need to solve urgently.
Disclosure of Invention
In view of this, embodiments of the present invention provide a system and a method for controlling operating conditions, and a main control unit, so as to improve the thermal efficiency of a boiler while ensuring the safety of a pulverizing system.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an operating condition control system comprising: a host and a master control room;
the host is used for acquiring a data signal, and the data signal indicates the concentration value of CO gas in a primary air powder pipe of a powder making system; determining whether a monitoring result of safety risk exists in the powder making system according to the concentration value of the CO gas; sending the monitoring result to the master control room;
and the main control unit of the main control room is used for controlling the working condition of the boiler when the monitoring result shows that the pulverizing system has no safety risk so as to improve the thermal efficiency of the boiler.
Optionally, the determining, by the host, whether the powder process system has a safety risk according to the concentration value of the CO gas includes:
determining whether a monitoring result of abnormal accumulation of coal dust exists in the coal pulverizing system according to the concentration value of the CO gas;
the master control unit is used for monitoring the result does when powder process system does not have the safety risk, the operating mode of control boiler to improve boiler thermal efficiency includes:
and controlling and improving the temperature of the pulverized coal entering the boiler when the monitoring result shows that the pulverized coal abnormal accumulation does not exist in the pulverizing system.
Optionally, the main control unit is configured to, when the monitoring result is that there is no abnormal accumulation of coal dust in the coal pulverizing system, control to increase the temperature of coal dust entering the boiler, including:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, controlling and increasing the coal powder temperature at the inlet end of the primary air-powder pipe; and the inlet end of the primary air-powder pipe is connected with the coal powder outlet end of a coal mill of the coal pulverizing system.
Optionally, the main control unit is used for, the monitoring result is when the powder process system does not have the unusual accumulation of buggy, and the control improves the buggy temperature of the entry end of wind powder pipe and includes:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, adjusting the coal powder temperature at the inlet end of the primary air-powder pipe to a set critical temperature;
and gradually increasing the coal dust temperature at the inlet end of the primary air-powder pipe from the critical temperature until the monitoring result is modified to the abnormal accumulation of the coal dust in the coal pulverizing system, and updating the critical temperature according to the determined coal dust temperature when the monitoring result is adjusted from the abnormal accumulation of the coal dust to the abnormal accumulation of the coal dust in the coal pulverizing system.
Optionally, the main control unit is further configured to reduce the temperature of the pulverized coal at the inlet end of the primary air-pulverized pipe when the monitoring result indicates that the pulverized coal is abnormally accumulated in the pulverizing system.
Optionally, the determining, by the host, whether there is an abnormal accumulation of coal dust in the coal pulverizing system according to the concentration value of the CO gas includes:
at least judging whether the concentration value is larger than a set concentration threshold interval or not according to the concentration value;
if at least the concentration value is determined to be larger than the concentration threshold interval, determining that coal dust abnormal accumulation exists in the coal pulverizing system;
and if at least the concentration value is determined to be in the concentration threshold interval, determining that the coal pulverizing system does not have abnormal accumulation of coal dust.
Optionally, the determining, by the host, whether the concentration value is greater than a set concentration threshold interval at least includes:
judging whether the concentration value is larger than a set concentration threshold interval or not and whether the change rate of the concentration value is larger than a set concentration change rate or not;
the host is configured to determine that abnormal accumulation of coal dust in the coal pulverizing system includes:
if the concentration value is larger than the concentration threshold interval and the change rate of the concentration value is larger than or smaller than the set concentration change rate, determining that coal dust abnormal accumulation exists in the coal pulverizing system;
the host is configured to determine that the coal pulverizing system has no abnormal accumulation of coal dust if at least the concentration value is determined to be within the concentration threshold interval, including:
and if the concentration value is in the concentration threshold interval and the change rate of the concentration value is smaller than the set concentration change rate, determining that the coal powder preparation system does not have abnormal accumulation of the coal powder.
Optionally, the determining, by the host, whether there is an abnormal accumulation of coal dust in the coal pulverizing system according to the concentration of the CO gas further includes:
if the concentration value is smaller than the concentration threshold interval, circularly judging whether the concentration value is larger than the concentration threshold interval or not, and determining that coal dust abnormal accumulation exists in the coal pulverizing system when the concentration value is larger than the concentration threshold interval.
Optionally, the determining, by the host, whether there is an abnormal accumulation of coal dust in the coal pulverizing system according to the concentration value of the CO gas includes:
judging whether the change rate of the concentration value is greater than a set change rate or not according to the concentration value;
if the change rate of the concentration value is greater than the set concentration change rate, determining that coal dust is abnormally accumulated in the coal pulverizing system;
and if the change rate of the concentration value is smaller than the set concentration change rate, determining that the coal pulverizing system does not have abnormal accumulation of the coal dust.
Optionally, the system further includes: the device comprises a sampling probe, a sampling pump, an analyzer and a filter;
the sampling probe is arranged in the primary air powder pipe and is used for sampling the sampling gas containing CO gas in the primary air powder pipe; the primary air-powder pipe is used for conveying pulverized coal from a coal mill of the coal pulverizing system to a burner of a boiler body;
the sampling pump is connected with the sampling probe and the filter and is used for extracting sampling gas sampled by the sampling probe and sending the sampling gas into the filter;
the filter is connected with the sampling pump and the analyzer and is used for filtering the sampling gas sampled by the sampling pump and sending the filtered sampling gas to the analyzer;
the analyzer is electrically connected with the host and is used for analyzing the concentration of the CO gas in the sampled gas, obtaining a data signal representing the concentration value of the CO gas and transmitting the data signal to the host.
The embodiment of the invention also provides a working condition control method, which comprises the following steps:
acquiring a monitoring result, wherein the monitoring result is determined based on a concentration value of CO gas in a primary air powder pipe of a powder making system, and the monitoring result is used for indicating whether the powder making system has a safety risk or not;
and when the monitoring result is that the powder preparation system has no safety risk, the working condition of the boiler is controlled so as to improve the thermal efficiency of the boiler.
Optionally, the step of using the monitoring result to indicate whether the pulverizing system has a safety risk includes:
the monitoring result is specifically used for indicating whether the coal pulverizing system has a monitoring result of abnormal accumulation of coal dust;
the monitoring result does when powder process system does not have the safety risk, the operating mode of control boiler to improve boiler thermal efficiency includes:
and controlling and improving the temperature of the pulverized coal entering the boiler when the monitoring result shows that the pulverized coal abnormal accumulation does not exist in the pulverizing system.
Optionally, when the monitoring result is that the coal pulverizing system does not have abnormal accumulation of coal dust, controlling and improving the temperature of the coal dust entering the boiler includes:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, controlling and increasing the coal powder temperature at the inlet end of the primary air-powder pipe; and the inlet end of the primary air-powder pipe is connected with the coal powder outlet end of a coal mill of the coal pulverizing system.
Optionally, the main control unit is used for, the monitoring result is when the powder process system does not have the unusual accumulation of buggy, and the control improves the buggy temperature of the entry end of wind powder pipe and includes:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, adjusting the coal powder temperature at the inlet end of the primary air-powder pipe to a set critical temperature;
and gradually increasing the coal dust temperature at the inlet end of the primary air-powder pipe from the critical temperature until the monitoring result is modified to the abnormal accumulation of the coal dust in the coal pulverizing system, and updating the critical temperature according to the determined coal dust temperature when the monitoring result is adjusted from the abnormal accumulation of the coal dust to the abnormal accumulation of the coal dust in the coal pulverizing system.
Optionally, the method includes: and when the monitoring result shows that the coal powder is abnormally accumulated in the coal pulverizing system, reducing the temperature of the coal powder at the inlet end of the primary air-powder pipe.
The embodiment of the invention also provides a main control unit, which comprises at least one memory and at least one processor; the memory stores computer-executable instructions that are invoked by the processor to perform any of the above described condition control methods.
In the working condition control system provided by the embodiment of the invention, the host is used for acquiring a data signal indicating the concentration value of CO gas in a primary air powder pipe of the powder making system, and determining whether the powder making system has a monitoring result of safety risk according to the concentration value of the CO gas, so that the safety monitoring of the powder making system can be realized; furthermore, the host machine can also send the monitoring result to the main control room, so that the main control unit of the main control room can control the working condition of the boiler when the monitoring result indicates that the powder making system has no safety risk, thereby improving the thermal efficiency of the boiler, and realizing the improvement of the thermal efficiency of the boiler (namely reducing the coal consumption of power generation) under the condition of ensuring the safety of the powder making system.
Therefore, the working condition control system provided by the embodiment of the invention can realize the safety monitoring of the powder making system through the host machine based on the concentration of the CO gas in the primary air powder pipe of the powder making system, and meanwhile, can realize the improvement of the thermal efficiency of the boiler by controlling the working condition of the boiler through the main control unit of the main control room when the monitoring result indicates that the powder making system has no safety risk.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic representation of the relationship of coal auto-heating time to coal fines temperature;
FIG. 2 is a block diagram of a condition control system according to an embodiment of the present invention;
FIG. 3 is an interaction flow diagram of a system provided by an embodiment of the invention;
FIG. 4 is a flow chart of increasing the temperature of pulverized coal at the inlet end of a primary air-pulverized coal pipe according to an embodiment of the present invention;
FIG. 5 is a flow chart of data processing of a host according to an embodiment of the present invention;
FIG. 6 is a flow chart of another data processing of the host according to the embodiment of the present invention;
FIG. 7 is a flow chart of another data processing of the host according to the embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a condition control system according to an embodiment of the present disclosure;
FIG. 9 is a flowchart of a method for controlling operating conditions according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a main control unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to improve the thermal efficiency of the boiler under the condition of ensuring the safety of the powder making system, the embodiment of the invention can consider that the thermal efficiency of the boiler is improved by controlling the working condition of the boiler (such as controlling the temperature of pulverized coal entering the boiler) when the powder making system has no safety risk. Specifically, the principle of the embodiment of the present invention is described below from the safety monitoring level of the pulverizing system and the operating condition control level of the boiler.
Firstly, from the safety monitoring aspect of a coal pulverizing system:
the pulverized coal easily causes the problem of spontaneous combustion or implosion of a pulverizing system due to the characteristics of the pulverized coal, so that the conditions of poor safety of the pulverizing system and low combustion efficiency of a boiler occur. The conditions that the pulverized coal triggers the powder preparation system to self-ignite or implode appear can be explained in detail from the following three aspects of the pulverized coal:
first, the explosion limit of pulverized coal is explained, which varies according to the coal type, and the general explosion limit is: 50-2000g/m3 (grams per cubic meter), because the air-powder mixture of the pulverizing system is in a suspension state, coal dust explosion occurs in a concentration range between the lower explosion limit and the upper explosion limit, and researches show that the coal dust concentration of a power plant is in the explosion limit range, so that the possibility of explosion of power coal of the power plant is high;
secondly, it is stated from the volatile content of the pulverized coal that the pulverized coal (such as anthracite) with VR (volatile content) < 10% generally has no explosion hazard, while the pulverized coal (such as bituminous coal) with VR (volatile content) > 25% can easily self-ignite, the possibility of explosion is very high, and the power plant power coal generally belongs to the bituminous coal and the lignite with high self-ignition tendency of Vdaf (dry ash-free volatile content) > 30%, so the power plant power coal has high possibility of explosion;
finally, the fineness of the pulverized coal dust is explained, and the finer the fineness of the pulverized coal is, the greater the explosion risk is. For bituminous coal, the particle size of coal powder is less than 100um (micrometer), which is within the range of explosion fineness, and most of the coal powder fineness of the existing main stream coal mill is within the range of explosion fineness, which has a large explosion risk, so that the coal powder is abnormally accumulated in a powder preparation system, and the risk of spontaneous combustion or implosion of the powder preparation system is easily caused.
From the above description, it can be seen that the pulverizing system is prone to risk of spontaneous combustion and implosion due to the nature of the coal fines. Further research shows that due to the fact that the internal pipelines of the powder making system are complex, the abnormal accumulation of the pulverized coal in the working process of the powder making system occurs sometimes, and based on the characteristics of the pulverized coal, the abnormal accumulation of the pulverized coal can cause the temperature rise of the powder making system, so that when the temperature rises to the spontaneous combustion or implosion critical point of the pulverized coal, the spontaneous combustion or implosion condition of the powder making system occurs, and the safe operation of the whole powder making system is influenced; therefore, on the basis of the characteristics of the pulverized coal, the abnormal accumulation of the pulverized coal is an important reason for the risk of spontaneous combustion and implosion of the pulverizing system, and therefore in an optional implementation, the monitoring of whether the safety risk exists in the pulverizing system can be achieved by monitoring whether the abnormal accumulation of the pulverized coal exists in the pulverizing system.
In further research discovery, due to the characteristics of the coal dust, through coal pyrolysis power theory research and experimental verification, firstly, CO (carbon monoxide) gas is firstly separated out, the separated-out magnitude is 1-2 magnitude magnitudes larger than that of hydrocarbon products, the CO gas is suitable for being used as judgment index gas of the spontaneous combustion occurrence degree of coal and has an excellent calibration effect, and therefore the coal dust accumulation condition of a coal pulverizing system can be monitored through the CO gas; in addition, the evolution of CO gas is at the point in time of the boundary between the preparatory phase and the autothermal phase of the coal autothermal process, see FIG. 1, as shown in the figure, the dividing point has a certain time margin from the inflection point of temperature rise (deep oxidation temperature point), the concentration of CO is gradually increased along with the gradual increase of the temperature of the pulverized coal, when the temperature of the coal dust reaches the critical self-heating temperature of the coal, the oxidation temperature rise rate is rapidly accelerated, the oxidation temperature rise rate is changed from slow linear increase to geometric progression (power-law increase), and finally the coal reaches the ignition point temperature of the coal and is combusted, it can be seen that there is a certain time interval from the autothermal evolution of CO gas from the coal to the point of ignition of the coal, this time interval being a redundant time, that is, by monitoring the generation time of the CO gas, the condition of abnormal accumulation of the pulverized coal is proved to exist, and the safety monitoring of the pulverizing system can be realized.
Secondly, from the working condition control level of the boiler:
the boiler is an energy conversion device, the energy input to the boiler is in the forms of chemical energy in fuel, heat energy of high-temperature flue gas and the like, steam, high-temperature water or an organic heat carrier with certain heat energy is output outwards after conversion of the boiler, and the main working principle of the boiler is a thermal device for converting the energy by using the heat energy released after the fuel is combusted. In the boiler, the fuel (coal powder) in the hearth is combusted to continuously release heat, the high-temperature flue gas generated by combustion transfers the heat to a heating surface of the boiler through heat propagation, the temperature of the high-temperature flue gas is gradually reduced, and the high-temperature flue gas is finally discharged from a chimney.
In summary, the embodiment of the present invention provides an improved technical solution by considering the safety risk angle of the pulverizing system and the thermal efficiency angle of the boiler, so as to achieve the purpose of increasing the thermal efficiency of the boiler under the condition of ensuring the safety of the pulverizing system. According to the embodiment of the invention, whether the safety risk exists in the powder making system (if the abnormal accumulation of the pulverized coal exists) is monitored by monitoring the CO gas in the primary air powder pipe of the powder making system, and a foundation is provided for preventing the spontaneous combustion or implosion problem of the powder making system; furthermore, when the safety risk of the powder making system is monitored to be absent, the thermal efficiency of the boiler can be improved by controlling the working condition of the boiler (such as improving the temperature of pulverized coal entering the boiler), so that the thermal efficiency of the boiler can be improved under the condition of ensuring the safety of the powder making system. In an implementation scheme, embodiments of the present invention provide a system and a method for controlling a working condition, and a main control device, which will be described in detail below.
In an alternative implementation, an embodiment of the present invention discloses a condition control system, and referring to fig. 2, the system may include: a host 1 and a main control room 2.
The host is the data processing equipment for realizing the safety monitoring of the pulverizing system, which is arranged in the embodiment of the invention, and the host at least has data processing capacity, for example, the host is a chip, a singlechip and the like; in the embodiment of the invention, the host can acquire the data signal indicating the concentration value of the CO gas in the primary air powder pipe of the powder making system, and then the monitoring of whether the powder making system has safety risk or not is realized through the concentration value of the CO gas in the primary air powder pipe of the powder making system;
the embodiment of the invention is not limited, and a way of obtaining the concentration value of the CO gas in the primary air powder pipe of the powder making system is provided, for example, the embodiment of the invention can sample the CO gas in the primary air powder pipe of the powder making system and then analyze the concentration of the sampled CO gas, and for example, the embodiment of the invention can arrange a gas concentration sensor in the primary air powder pipe of the powder making system, so as to sense the concentration of the CO gas and transmit the concentration to a host.
In the embodiment of the invention, the host computer can be in communication connection with the main control room, and the main control room is a central control device with system data processing, gateway communication connection and centralized control capabilities in a coal-fired unit; the main control room can be a DCS (distributed control system), and the working condition control and management of the coal-fired unit are realized through modes of decentralized control, centralized operation, hierarchical management, flexible configuration, convenient configuration and the like; in an embodiment of the present invention, the main control room may include a main control unit for controlling the operating conditions of the devices in the coal-fired unit, and the main control unit, such as a temperature control unit, may be used for controlling the temperature operating conditions.
Based on fig. 2, fig. 3 shows a system interaction flow chart provided by an embodiment of the present invention, and as shown in fig. 3, the flow chart may include:
s100, the host computer obtains a data signal, and the data signal indicates the concentration value of CO gas in a primary air powder pipe of the powder making system.
S110, determining whether the powder making system has a monitoring result of safety risk or not according to the concentration value of the CO gas by the host.
And S120, the host sends the monitoring result to a main control room.
S130, when the monitoring result shows that the pulverizing system has no safety risk, the main control unit of the main control room controls the working condition of the boiler so as to improve the thermal efficiency of the boiler.
Therefore, in the working condition control system provided by the embodiment of the invention, the host is used for acquiring the data signal indicating the concentration value of the CO gas in the primary air powder pipe of the powder making system, and determining whether the powder making system has a monitoring result of safety risk according to the concentration value of the CO gas, so that the safety monitoring of the powder making system can be realized; furthermore, the host machine can also send the monitoring result to the main control room, so that the main control unit of the main control room can control the working condition of the boiler when the monitoring result indicates that the powder making system has no safety risk, thereby improving the thermal efficiency of the boiler, and realizing the improvement of the thermal efficiency of the boiler (namely reducing the coal consumption of power generation) under the condition of ensuring the safety of the powder making system.
The working condition control system provided by the embodiment of the invention can realize the safety monitoring of the powder making system through the host machine based on the CO gas concentration in the primary air powder pipe of the powder making system, and meanwhile, when the monitoring result indicates that the powder making system has no safety risk, the working condition of the boiler can be controlled through the main control unit of the main control room, so that the thermal efficiency of the boiler can be improved.
In an optional implementation, whether the safety risk of the powder making system exists or not can be whether the powder making system has abnormal accumulation of the pulverized coal or not, and the CO gas is the gas which is separated out earliest and is most easily detected in the abnormal accumulation process of the pulverized coal, so that in the optional implementation of the embodiment of the invention, the host machine can monitor whether the powder making system has abnormal accumulation of the pulverized coal or not by using the concentration value of the CO gas in the primary air powder pipe of the powder making system, and therefore whether the safety risk of the powder making system exists or not is monitored. That is to say, optionally, the host may determine, according to a concentration value of CO gas in a primary air duct of the powder process system, whether the powder process system has a monitoring result of abnormal accumulation of pulverized coal, and the abnormal accumulation of pulverized coal of the powder process system may be regarded as a safety risk of an optional form of the powder process system.
Optionally, when the monitoring result given by the host computer indicates that the coal pulverizing system does not have abnormal accumulation of coal dust, the main control unit can control the working condition of the boiler by controlling and increasing the temperature of the coal dust entering the boiler; it can be understood that when it is determined that the coal pulverizing system has no abnormal accumulation of coal dust, it is indicated that the coal pulverizing system has no safety risk temporarily, and the embodiment of the invention can reduce the coal consumption under the condition that the coal pulverizing system has no safety risk, so that the coal-fired unit is promoted in the energy-saving direction under the condition of safety; in the optional implementation of the embodiment of the invention, the main control unit can control and improve the temperature of the pulverized coal entering the boiler, so that the pulverized coal entering the boiler for combustion has higher temperature, the smoke exhaust temperature of the boiler can be effectively reduced, the thermal efficiency of the boiler is finally improved, and the coal consumption of the boiler is reduced.
Optionally, the main control unit may control and increase the temperature of the pulverized coal entering the boiler by: before the boiler is sent into the boiler, the temperature of the pulverized coal is raised; for example, the pulverized coal is fed into the boiler furnace from the outlet of the coal mill through the primary air-powder pipe, so in an alternative implementation, the temperature of the pulverized coal can be raised through a heating means at the outlet part of the coal mill or the conveying part of the primary air-powder pipe.
Optionally, in a more specific implementation, when the monitoring result indicates that the coal pulverizing system does not have abnormal accumulation of coal dust, the main control unit may increase the temperature of coal dust at the inlet end of the primary air-dust pipe by controlling, for example, increase the temperature of primary air in the primary air-dust pipe, where the primary air is used to send the coal dust from the coal pulverizer outlet to the boiler furnace, so as to increase the temperature of coal dust entering the boiler; the inlet end of the primary air pulverized coal pipe can be connected with the pulverized coal outlet end of a coal mill of the pulverizing system, namely, the temperature of the pulverized coal entering the boiler can be increased by increasing the temperature of the pulverized coal at the outlet end of the coal mill.
In another alternative implementation, the main control unit may control to increase the temperature of the pulverized coal entering the boiler by: when the boiler is fed into the boiler, the temperature of the pulverized coal is raised; for example, when the pulverized coal is fed into a boiler furnace, the temperature of the primary air in the primary air pulverized coal pipe is increased, and then the temperature of the pulverized coal is increased.
Optionally, further, when the monitoring result indicates that the coal pulverizing system has abnormal accumulation of coal dust, it indicates that the coal pulverizing system has a safety risk, the main control unit may reduce the temperature of coal dust at the inlet end of the primary air-dust pipe, for example, may reduce the temperature of primary air in the primary air-dust pipe, the primary air is used to send the coal dust into the boiler furnace from the temperature of coal dust at the outlet of the coal pulverizer, so as to reduce the temperature of coal dust in the primary air-dust pipe, thereby reducing the possibility of further deterioration of the safety risk of the coal pulverizing system, and further adjusting the coal pulverizing system in a direction without the safety risk.
Optionally, the main control unit may be a temperature control unit for controlling temperature conditions, and the temperature control unit may send a temperature adjustment signal to temperature adjustment devices arranged in each part of the coal-fired unit to achieve temperature increase or temperature decrease; for example, when controlling and increasing the temperature of the pulverized coal at the inlet end of the primary air-pulverized coal pipe, the embodiment of the invention can arrange a temperature adjusting device at the inlet end of the primary air-pulverized coal pipe, so that the temperature control unit can control the temperature adjusting device to increase the temperature through the temperature rise signal, and control the temperature adjusting device to decrease the temperature through the temperature drop signal.
Optionally, in the embodiment of the present invention, the temperature adjusting device may be a hot and cold air control unit of a coal mill, specifically, the temperature control unit may control the hot and cold air control unit of the coal mill to increase the temperature through a temperature rise signal, and control the hot and cold air control unit of the coal mill to decrease the temperature through a temperature decrease signal.
It should be noted that, when the pulverized coal making system has no safety risk (e.g., no abnormal accumulation of pulverized coal), the temperature of the pulverized coal entering the boiler is increased, which is only an optional way of controlling the working condition of the boiler to increase the thermal efficiency of the boiler, and the embodiments of the present invention do not exclude other ways of controlling the working condition of the boiler to increase the thermal efficiency of the boiler, and in the optional implementation, the main control unit can control and increase the temperature of the pulverized coal at the inlet end of the primary air-pulverized coal pipe to increase the temperature of the pulverized coal entering the boiler when the pulverized coal making system has no abnormal accumulation of pulverized coal; in order to ensure the accuracy of the improved temperature, the embodiment of the invention can gradually improve the temperature of the pulverized coal at the inlet end of the primary air-pulverized pipe in a stepped manner to find the critical temperature of the pulverized coal at the inlet end of the primary air-pulverized pipe when the pulverized coal abnormal accumulation does not exist in the pulverizing system and adjust the temperature of the pulverized coal before adjustment when the pulverized coal abnormal accumulation exists, so that the critical temperature can be considered as the highest temperature which can improve the energy efficiency of the fire coal when the pulverized coal abnormal accumulation does not exist in the pulverizing system; it should be noted that, since the operating condition is continuously adjusted, the critical temperature is also continuously adjusted.
Optionally, when the coal pulverizing system does not have abnormal accumulation of coal dust, the specific implementation of the main control unit controlling and increasing the coal dust temperature at the inlet end of the primary air-powder pipe may be as follows:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, adjusting the coal powder temperature at the inlet end of the primary air-powder pipe to a set critical temperature; optionally, the set critical temperature is adjusted to the adjusted pre-adjustment pulverized coal temperature when the abnormal accumulation of pulverized coal does not exist last time in the pulverizing system, that is, in the process of increasing the pulverized coal temperature at the inlet end of the primary air-powder pipe by the method provided by the embodiment of the present invention, the last adjusted pre-adjustment pulverized coal temperature when the abnormal accumulation of pulverized coal does not exist last time in the pulverizing system.
And gradually increasing the coal dust temperature at the inlet end of the primary air-powder pipe from the critical temperature until the monitoring result is modified to the abnormal accumulation of the coal dust in the coal pulverizing system, and updating the critical temperature according to the determined coal dust temperature when the monitoring result is adjusted from the condition that the abnormal accumulation of the coal dust does not exist to the condition that the abnormal accumulation of the coal dust exists.
Specifically, the temperature of the primary air powder pipe is increased in a stepped manner, the temperature can be increased by setting the temperature to be one step at every 2 ℃ or 5 ℃ and the highest gradient is not more than 20 ℃; the embodiment of the present invention is described with 5 ℃ as a step, referring to fig. 4, fig. 4 is a flowchart of increasing the temperature of pulverized coal at the inlet end of the primary air-pulverized coal pipe, as shown in fig. 4, the flowchart may include:
and S10, adjusting the temperature of the coal powder at the inlet end of the primary air-powder pipe to a set critical temperature when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder making system.
Optionally, the set critical temperature is a highest temperature capable of improving coal-fired energy efficiency when no abnormal accumulation of coal dust exists in the powder preparation system in the previous safety production process, and the coal dust temperature at the inlet end of the primary air-powder pipe is adjusted to the set critical temperature, so that higher energy efficiency is achieved when no abnormal accumulation of coal dust exists in the powder preparation system.
And S11, increasing the temperature of the coal dust at the inlet end of the primary air-powder pipe by 5 ℃ from the set critical temperature.
Optionally, the increase of 5 ℃ is only an optional adjusting stage in the embodiment of the present invention, and an appropriate adjusting stage can be selected according to actual conditions to adjust, so as to achieve the purpose of increasing the thermal efficiency of the boiler to the maximum extent under the condition of ensuring the safety of the pulverizing system.
And S12, judging whether the monitoring result is adjusted to be that the coal dust is abnormally accumulated.
Optionally, if the monitoring result is adjusted to that abnormal accumulation of coal dust exists, the temperature is reduced by 5 ℃ (the original critical temperature is maintained) so as to maintain the safe operation of the pulverizing system.
Optionally, if the monitoring result is not adjusted to have abnormal accumulation of coal dust, that is, the abnormal accumulation of coal dust does not exist, the temperature is continuously increased by 5 ℃, whether the monitoring result is adjusted to have abnormal accumulation of coal dust is observed, and the temperature is adjusted by executing the steps.
And S13, determining the temperature of the pulverized coal before adjustment, updating the critical temperature according to the determined temperature of the pulverized coal, and reducing the temperature of the pulverized coal at the inlet end of the primary air-powder pipe.
Optionally, after the temperature of the primary air-powder pipe opening is increased by 5 ℃, if the monitoring result indicates that no abnormal accumulation of coal powder exists, the process continues to loop S11-S12, specifically, the temperature of coal powder at the inlet end of the primary air-powder pipe is continuously increased by 5 ℃, if the monitoring result indicates that the abnormal accumulation of coal powder exists in the powder preparation system, the increase of the temperature of coal powder at the inlet end of the primary air-powder pipe is stopped, the temperature of coal powder at the inlet end of the primary air-powder pipe which is increased by 5 ℃ is determined to reach a set critical temperature, and the critical temperature is maintained unchanged.
Optionally, when the pulverizing system is operated next time, the critical temperature set for the previous time is used as the coal powder temperature at the inlet end of the primary air-powder pipe, and the set critical temperature is adjusted circularly by the method.
The critical temperature is determined by the adjusting method based on the critical temperature, the temperature of the pulverized coal at the inlet end of the primary air-powder pipe before the abnormal accumulation of the pulverized coal exists last time is used as the set critical temperature, and the initial temperature of the inlet end of the corresponding primary air-powder pipe can be set based on the past safety production experience when the powder preparation system is monitored to have no abnormal accumulation of the pulverized coal; and then, under the condition that the abnormal accumulation of the pulverized coal in the pulverizing system is monitored in real time, the temperature of primary air in the primary air pulverized coal pipe is raised from the critical temperature, wherein the primary air is used for conveying the pulverized coal to a boiler hearth from an outlet of a coal mill for combustion, so that the temperature of the pulverized coal in the primary air pulverized coal pipe is increased, the coal consumption of power generation is reduced, and the thermal efficiency of the boiler is improved.
The following explains the optional implementation of monitoring whether the coal pulverizing system has abnormal accumulation of coal dust by the host according to the data signal from the perspective of the host; referring to fig. 5, the monitoring result that the host is configured to determine whether the coal pulverizing system has abnormal accumulation of coal dust according to the concentration value of the CO gas may include:
and S21, at least judging whether the concentration value is larger than a set concentration threshold interval according to the concentration value.
The set concentration threshold interval is as follows: when the powder preparation system of the power plant is in safe operation, the coal powder is in a concentration change interval of CO gas generated by low-temperature oxidation reaction. Optionally, different working conditions and different types of coal dust are adopted, and when the coal pulverizing system is in safe operation, the concentration change intervals of CO gas generated by the coal dust through low-temperature oxidation reaction may be different.
And S22, if at least the concentration value is determined to be larger than the concentration threshold value interval, determining that coal dust abnormal accumulation exists in the coal pulverizing system.
And S23, if at least the concentration value is determined to be in the concentration threshold value interval, determining that the coal pulverizing system does not have abnormal accumulation of coal dust.
In the above description, it is only an optional implementation manner of the embodiment of the present invention that the determination of whether the concentration variation value is in the threshold interval is performed, and fig. 6 may determine whether the concentration value is greater than the set concentration threshold interval, and whether the variation rate of the concentration value is greater than the set concentration variation rate, so as to monitor whether the abnormal accumulation of the pulverized coal exists; optionally, referring to fig. 6, fig. 6 is another optional implementation of a data processing flow diagram of the host, where the flow may include:
s31, judging whether the concentration value is larger than a set concentration threshold value interval or not and whether the change rate of the concentration value is larger than a set concentration change rate or not.
The set concentration change rate is: and when the powder preparation system of the power plant is in safe operation, the coal powder generates the change rate of the concentration of CO gas through low-temperature oxidation reaction. Optionally, different working conditions and different types of coal dust are adopted, and the concentration change rate of CO gas generated by the coal dust through low-temperature oxidation reaction is possibly different when the pulverizing system is in safe operation.
And S32, if the concentration value is larger than the concentration threshold value interval and the change rate of the concentration value is larger than or smaller than the set concentration change rate, determining that coal dust abnormal accumulation exists in the coal pulverizing system.
And S33, if the concentration value is in the concentration threshold value interval and the change rate of the concentration value is smaller than the set concentration change rate, determining that the coal powder making system does not have abnormal accumulation of coal powder.
Optionally, S32 and S33 may be regarded as an optional implementation manner for the host to determine whether the pulverizing system is at risk according to the concentration threshold and the change rate of the concentration value.
Optionally, if it is monitored that the concentration value of the CO gas is smaller than the concentration threshold interval, the host according to the embodiment of the present invention may perform the following processing with respect to the concentration of the CO gas that is continuously sampled: and circularly judging whether the concentration value is greater than a set concentration threshold interval or not until the concentration value is greater than the concentration threshold interval, and determining that coal dust abnormal accumulation exists in the coal pulverizing system.
In another optional implementation, different from fig. 5, whether coal dust abnormal accumulation exists is determined at least by judging a relationship between a concentration value and the concentration threshold interval, and the embodiment of the present invention may determine whether coal dust abnormal accumulation exists by judging a relationship between a change rate of the concentration value and a set change rate of the concentration; correspondingly, an embodiment of the present invention further provides a method for determining whether there is abnormal accumulation of coal dust in a coal pulverizing system by determining a change rate of the concentration value, where fig. 7 is a diagram illustrating a relationship between the change rate of the concentration value and a set concentration change rate according to the concentration value represented by the data signal to determine whether there is abnormal accumulation of coal dust, and fig. 7 is another optional implementation manner of a data processing flow chart of a host computer, where the flow may include:
and S41, judging whether the change rate of the concentration value is larger than a set change rate or not according to the concentration value represented by the data signal.
And S42, if the change rate of the concentration value is greater than the set concentration change rate, determining that coal dust abnormal accumulation exists in the coal pulverizing system.
And S43, if the change rate of the concentration value is smaller than the set concentration change rate, determining that the coal powder preparation system does not have abnormal accumulation of coal powder.
Alternatively, S42 and S43 can be considered as an alternative implementation for the host computer to determine whether the pulverizing system is at risk based on the rate of change of concentration.
The embodiment of the invention monitors the powder making system based on the data signals, realizes the safety monitoring of the powder making system, provides a basis for adjusting the temperature of the pulverized coal in the primary air-powder pipe, and improves the thermal efficiency of the boiler under the condition of ensuring the safety of the powder making system.
Referring to fig. 8, the operating condition control system disclosed in the embodiment of the present invention may further include: a sampling probe 3, a sampling pump 4, an analyzer 5 and a filter 6;
the sampling probe 3 is arranged in the primary air powder pipe 7 and is used for sampling gas containing CO gas in the primary air powder pipe 7; the primary air-powder pipe 7 is used for conveying pulverized coal from a coal mill of the coal pulverizing system to a boiler body burner.
Because the wind powder pipe 7 is used for with during the buggy in the 8 outlet pipes of coal pulverizer is carried to boiler body fuel nozzle 9, consequently the wind powder pipe 7 of once installs sampling probe 3, thereby pass through sampling probe 3 contains the gaseous sample gas of CO in to wind powder pipe 7 of once, and monitor CO gas concentration, whether monitoring powder process system exists the unusual accumulation of buggy, and then realize the risk monitoring to the powder process system, provide the basis for the buggy temperature of adjusting the wind powder pipe of once, under the circumstances that guarantees powder process system safety, improve boiler combustion efficiency.
The sampling pump 4 is connected with the sampling probe 3 and the filter 6 and is used for extracting sampling gas sampled by the sampling probe.
Optionally, the sampling pump 4 is used for pumping the sampling gas sampled by the sampling probe into the filter.
The filter 6 is connected with the sampling pump 4 and the analyzer 5, and is used for filtering the sampling gas sampled by the sampling pump 4.
Optionally, the sampling pump 4 passes through the sampling tube with the sampling probe 3 is connected, the sampling pump 4 pass through the connecting pipe with the filter 6 is connected, the filter 6 pass through the connecting pipe with the analysis appearance 5 is connected.
The analyzer 5 is electrically connected to the host 1, and is configured to analyze a concentration of CO gas in the sampled gas to obtain a data signal indicating a concentration value of the CO gas.
Optionally, the host 1 is electrically connected to the main control room 2, the host sends a monitoring result determined by a data signal based on a concentration value of CO gas in a primary air pulverized pipe of the pulverizing system to the main control unit of the main control room, and the main control unit of the main control room can realize control over the working condition of the boiler based on the determined monitoring result, so as to improve the thermal efficiency of the boiler.
Referring to fig. 9, an embodiment of the present invention further provides a method for controlling a working condition, where the method includes:
s51, obtaining a monitoring result, wherein the monitoring result is determined based on a concentration value of CO gas in a primary air powder pipe of the powder making system, and the monitoring result is used for indicating whether the powder making system has safety risks.
S52, when the monitoring result is that the pulverizing system has no safety risk, controlling the working condition of the boiler to improve the thermal efficiency of the boiler.
Optionally, the refining step and the expanding step of the operating condition control method may refer to the description of the corresponding parts above, and are not described herein again.
An embodiment of the present invention further provides a main control unit, and referring to fig. 10, provides a main control unit, including: at least one processor 01, at least one communication interface 02, at least one memory 03 and at least one communication bus 04;
in the embodiment of the present invention, the processor 01, the communication interface 02, and the memory 03 complete mutual communication through the communication bus 04;
processor 01 may be a central processing unit CPU, or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement an embodiment of the invention.
The memory 03 may comprise a high-speed RAM memory, and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory.
The memory 03 stores a program, and the processor 01 calls the program stored in the memory 03 to execute the method for controlling the operating condition according to the embodiment of the present invention.
In the abnormal accumulation process of the pulverized coal in the pulverized coal making pipeline, the pulverized coal usually has low-temperature oxidation reaction, and in the low-temperature oxidation reaction of the pulverized coal, the CO gas is the gas which is separated out earliest and is the most easily detected in the abnormal accumulation process of the pulverized coal, so the embodiment of the invention uses the host to sample the CO gas-containing sampling gas in the primary air-pulverized coal pipe through the sampling probe according to the data signal, and the data signal is extracted by the air pump, so that the analyzer performs concentration analysis on the CO gas in the sampling gas to determine, then the host analyzes to determine whether the pulverized coal making system has abnormal accumulation of the pulverized coal, and sends the monitoring result to the main control room, and the main control room realizes the adjustment of the temperature of the pulverized coal in the primary air-pulverized coal pipe according to the monitoring result of the host. Therefore, the working condition control system provided by the embodiment of the invention realizes the safety monitoring of the powder making system by monitoring whether the powder making system has safety risks (abnormal accumulation of coal powder); furthermore, when the powder making system has no safety risk, the temperature of primary air in the primary air powder pipe is adjusted through the main control chamber, the primary air transmits the pulverized coal to the burner of the boiler body, the temperature of the pulverized coal in the primary air powder pipe can be increased, the temperature of the pulverized coal entering the boiler is increased, the power generation coal consumption is reduced, and resources are saved.
While various embodiments of the present invention have been described above, various alternatives described in the various embodiments can be combined and cross-referenced without conflict to extend the variety of possible embodiments that can be considered disclosed and disclosed in connection with the embodiments of the present invention.
Although the embodiments of the present invention have been disclosed, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (16)

1. An operating condition control system, comprising: a host and a master control room;
the host is used for acquiring a data signal, and the data signal indicates the concentration value of CO gas in a primary air powder pipe of a powder making system; determining whether a monitoring result of safety risk exists in the powder making system according to the concentration value of the CO gas; sending the monitoring result to the master control room;
and the main control unit of the main control room is used for controlling the working condition of the boiler when the monitoring result shows that the pulverizing system has no safety risk so as to improve the thermal efficiency of the boiler.
2. The operating condition control system of claim 1, wherein the host is configured to determine, according to the concentration value of the CO gas, whether the monitoring result of the pulverizing system has a safety risk includes:
determining whether a monitoring result of abnormal accumulation of coal dust exists in the coal pulverizing system according to the concentration value of the CO gas;
the master control unit is used for monitoring the result does when powder process system does not have the safety risk, the operating mode of control boiler to improve boiler thermal efficiency includes:
and controlling and improving the temperature of the pulverized coal entering the boiler when the monitoring result shows that the pulverized coal abnormal accumulation does not exist in the pulverizing system.
3. The operating condition control system according to claim 2, wherein the main control unit is configured to, when the monitoring result indicates that the coal pulverizing system does not have abnormal accumulation of coal dust, control to increase the temperature of coal dust entering the boiler, and includes:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, controlling and increasing the coal powder temperature at the inlet end of the primary air-powder pipe; and the inlet end of the primary air-powder pipe is connected with the coal powder outlet end of a coal mill of the coal pulverizing system.
4. The operating condition control system of claim 3, wherein the main control unit is configured to, when the monitoring result indicates that the coal pulverizing system does not have abnormal coal powder accumulation, control to increase the temperature of the coal powder at the inlet end of the primary air-powder pipe by:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, adjusting the coal powder temperature at the inlet end of the primary air-powder pipe to a set critical temperature;
and gradually increasing the coal dust temperature at the inlet end of the primary air-powder pipe from the critical temperature until the monitoring result is modified to the abnormal accumulation of the coal dust in the coal pulverizing system, and updating the critical temperature according to the determined coal dust temperature when the monitoring result is adjusted from the condition that the abnormal accumulation of the coal dust does not exist to the condition that the abnormal accumulation of the coal dust exists.
5. The working condition control system according to claim 3 or 4, wherein the main control unit is further configured to reduce the temperature of the pulverized coal at the inlet end of the primary air-pulverized pipe when the monitoring result indicates that the pulverized coal is abnormally accumulated in the pulverizing system.
6. The operating condition control system according to claim 2, wherein the host computer is configured to determine, according to the concentration value of the CO gas, a monitoring result of whether the coal pulverizing system has abnormal accumulation of the pulverized coal includes:
at least judging whether the concentration value is larger than a set concentration threshold interval or not according to the concentration value;
if at least the concentration value is determined to be larger than the concentration threshold interval, determining that coal dust abnormal accumulation exists in the coal pulverizing system;
and if at least the concentration value is determined to be in the concentration threshold interval, determining that the coal pulverizing system does not have abnormal accumulation of coal dust.
7. The condition control system according to claim 6, wherein the host is configured to at least determine whether the concentration value is greater than a set concentration threshold interval according to the concentration value, and includes:
judging whether the concentration value is larger than a set concentration threshold interval or not and whether the change rate of the concentration value is larger than a set concentration change rate or not;
the host is configured to determine that abnormal accumulation of coal dust in the coal pulverizing system includes:
if the concentration value is larger than the concentration threshold interval and the change rate of the concentration value is larger than or smaller than the set concentration change rate, determining that coal dust abnormal accumulation exists in the coal pulverizing system;
the host is configured to determine that the coal pulverizing system has no abnormal accumulation of coal dust if at least the concentration value is determined to be within the concentration threshold interval, including:
and if the concentration value is in the concentration threshold interval and the change rate of the concentration value is smaller than the set concentration change rate, determining that the coal powder preparation system does not have abnormal accumulation of the coal powder.
8. The operating condition control system according to claim 6 or 7, wherein the host computer is configured to determine, according to the concentration value of the CO gas, a monitoring result of whether the coal pulverizing system has abnormal accumulation of the pulverized coal, and further comprises:
if the concentration value is smaller than the concentration threshold interval, circularly judging whether the concentration value is larger than the concentration threshold interval or not, and determining that coal dust abnormal accumulation exists in the coal pulverizing system when the concentration value is larger than the concentration threshold interval.
9. The operating condition control system according to claim 2, wherein the host computer is configured to determine, according to the concentration value of the CO gas, a monitoring result of whether the coal pulverizing system has abnormal accumulation of the pulverized coal includes:
judging whether the change rate of the concentration value is greater than a set change rate or not according to the concentration value;
if the change rate of the concentration value is greater than the set concentration change rate, determining that coal dust is abnormally accumulated in the coal pulverizing system;
and if the change rate of the concentration value is smaller than the set concentration change rate, determining that the coal pulverizing system does not have abnormal accumulation of the coal dust.
10. The condition control system according to claim 1, further comprising: the device comprises a sampling probe, a sampling pump, an analyzer and a filter;
the sampling probe is arranged in the primary air powder pipe and is used for sampling the sampling gas containing CO gas in the primary air powder pipe; the primary air-powder pipe is used for conveying pulverized coal from a coal mill of the coal pulverizing system to a burner of a boiler body;
the sampling pump is connected with the sampling probe and the filter and is used for extracting sampling gas sampled by the sampling probe and sending the sampling gas into the filter;
the filter is connected with the sampling pump and the analyzer and is used for filtering the sampling gas sampled by the sampling pump and sending the filtered sampling gas to the analyzer;
the analyzer is electrically connected with the host and is used for analyzing the concentration of the CO gas in the sampled gas, obtaining a data signal representing the concentration value of the CO gas and transmitting the data signal to the host.
11. A method of controlling an operating condition, comprising:
acquiring a monitoring result, wherein the monitoring result is determined based on a concentration value of CO gas in a primary air powder pipe of a powder making system, and the monitoring result is used for indicating whether the powder making system has a safety risk or not;
and when the monitoring result is that the powder preparation system has no safety risk, the working condition of the boiler is controlled so as to improve the thermal efficiency of the boiler.
12. The condition control method of claim 11, wherein the monitoring result indicating whether a safety risk exists in a pulverizing system comprises:
the monitoring result is specifically used for indicating whether the coal pulverizing system has a monitoring result of abnormal accumulation of coal dust;
the monitoring result does when powder process system does not have the safety risk, the operating mode of control boiler to improve boiler thermal efficiency includes:
and controlling and improving the temperature of the pulverized coal entering the boiler when the monitoring result shows that the pulverized coal abnormal accumulation does not exist in the pulverizing system.
13. The operating condition control method according to claim 12, wherein when the monitoring result is that the coal pulverizing system does not have abnormal accumulation of coal dust, the controlling to increase the temperature of the coal dust entering the boiler comprises:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, controlling and increasing the coal powder temperature at the inlet end of the primary air-powder pipe; and the inlet end of the primary air-powder pipe is connected with the coal powder outlet end of a coal mill of the coal pulverizing system.
14. The method according to claim 13, wherein the main control unit is configured to, when the monitoring result indicates that the coal pulverizing system does not have abnormal coal dust accumulation, control to increase the temperature of the coal dust at the inlet end of the primary air-powder duct, and includes:
when the monitoring result shows that the coal powder abnormal accumulation does not exist in the coal powder preparation system, adjusting the coal powder temperature at the inlet end of the primary air-powder pipe to a set critical temperature;
and gradually increasing the coal dust temperature at the inlet end of the primary air-powder pipe from the critical temperature until the monitoring result is modified to the abnormal accumulation of the coal dust in the coal pulverizing system, and updating the critical temperature according to the determined coal dust temperature when the monitoring result is adjusted from the abnormal accumulation of the coal dust to the abnormal accumulation of the coal dust in the coal pulverizing system.
15. The operating condition control method according to claim 13 or 14, characterized by comprising: and when the monitoring result shows that the coal powder is abnormally accumulated in the coal pulverizing system, reducing the temperature of the coal powder at the inlet end of the primary air-powder pipe.
16. A master control unit comprising at least one memory and at least one processor; the memory stores computer-executable instructions that are invoked by the processor to perform the condition control method of any of claims 11-15.
CN201911193266.1A 2019-11-28 2019-11-28 Working condition control system and method and main control unit Active CN110906360B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911193266.1A CN110906360B (en) 2019-11-28 2019-11-28 Working condition control system and method and main control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911193266.1A CN110906360B (en) 2019-11-28 2019-11-28 Working condition control system and method and main control unit

Publications (2)

Publication Number Publication Date
CN110906360A true CN110906360A (en) 2020-03-24
CN110906360B CN110906360B (en) 2020-11-03

Family

ID=69820289

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911193266.1A Active CN110906360B (en) 2019-11-28 2019-11-28 Working condition control system and method and main control unit

Country Status (1)

Country Link
CN (1) CN110906360B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201662568U (en) * 2009-10-30 2010-12-01 北京华圣金程科技有限公司 Carbon monoxide detection system of novel coal mill
CN104801416A (en) * 2015-04-23 2015-07-29 东南大学 Control system and control method for outlet temperature of novel coal mill
CN107797965A (en) * 2017-10-23 2018-03-13 内蒙古岱海发电有限责任公司 A kind of update method and system of pulverizer outlet temperature secure setting
CN108237010A (en) * 2017-05-16 2018-07-03 安徽工业大学 A kind of coal pulverizer safe operation detecting system and its detection method
CN208476643U (en) * 2018-06-29 2019-02-05 陕西延长石油(集团)有限责任公司 A kind of coal pulverizer circulated air sample on-line analysis pretreatment system
CN209624160U (en) * 2019-01-18 2019-11-12 华电电力科学研究院有限公司 It is a kind of to export CO on-Line Monitor Device for explosion-proof coal pulverizer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201662568U (en) * 2009-10-30 2010-12-01 北京华圣金程科技有限公司 Carbon monoxide detection system of novel coal mill
CN104801416A (en) * 2015-04-23 2015-07-29 东南大学 Control system and control method for outlet temperature of novel coal mill
CN108237010A (en) * 2017-05-16 2018-07-03 安徽工业大学 A kind of coal pulverizer safe operation detecting system and its detection method
CN107797965A (en) * 2017-10-23 2018-03-13 内蒙古岱海发电有限责任公司 A kind of update method and system of pulverizer outlet temperature secure setting
CN208476643U (en) * 2018-06-29 2019-02-05 陕西延长石油(集团)有限责任公司 A kind of coal pulverizer circulated air sample on-line analysis pretreatment system
CN209624160U (en) * 2019-01-18 2019-11-12 华电电力科学研究院有限公司 It is a kind of to export CO on-Line Monitor Device for explosion-proof coal pulverizer

Also Published As

Publication number Publication date
CN110906360B (en) 2020-11-03

Similar Documents

Publication Publication Date Title
JP3062582B2 (en) Method and apparatus for predicting furnace state of pulverized coal combustion equipment
CA2343035C (en) System and method for integrated gasification control
EP2505256A1 (en) Exhaust gas treatment device for an oxygen combustion system
US20060283406A1 (en) Method and apparatus for controlling soot blowing using statistical process control
Donsi et al. Carbon fines production and elutriation from the bed of a fluidized coal combustor
US8483929B2 (en) Method of controlling an air preheating system of a gas turbine
JP5606623B2 (en) Biomass pyrolysis gasification method and apparatus via two interconnected furnaces
CN101034807A (en) Methods and apparatus for electric power grid frequency stabilization
US20120291436A1 (en) Steam generation system
CN105465865B (en) A kind of intelligent fume exhauster, control system and cloud platform
CN201040260Y (en) Coal mill self-adaptive control system
WO2005085397A1 (en) System for gasification of biomass and method for operation thereof
US20120052450A1 (en) System and method for control and optimization of a pulverized coal boiler system
US10350607B2 (en) Pulverizer monitoring
CN103670536A (en) Adjustment method for steam turbine control valve flows in thermal power plant
CN103047637B (en) Coke furnace flue gas waste heat and ascending pipe coal gas waste heat combined recycling system
AU2011202153A1 (en) Control System for Gas Turbine in Material Treatment Unit
US20110104624A1 (en) Method and apparatus of controlling combustion in oxyfuel combustion boiler
EP2853716B1 (en) Gas turbine facility
CN102042605A (en) Side-to-side thermal deashing method for rotary air preheater
CN100535512C (en) Optimizing and guiding system for coal-burned industrial boiler operation
WO2017168788A1 (en) Device abnormality diagnosis method and device abnormality diagnosis device
CN108456556A (en) A kind of gasification of biomass coupling coal-burning boiler electricity generation system and method
CN104481576A (en) Coal mine gas low emission catalytic oxidation heat supply system
CN102102870A (en) Furnace chamber ash-dirt subarea on-line monitoring device based on acoustic thermometry

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant