CN114184222A - Powder accumulation fire prevention detection method and device for pulverized coal pipe - Google Patents
Powder accumulation fire prevention detection method and device for pulverized coal pipe Download PDFInfo
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- CN114184222A CN114184222A CN202111182883.9A CN202111182883A CN114184222A CN 114184222 A CN114184222 A CN 114184222A CN 202111182883 A CN202111182883 A CN 202111182883A CN 114184222 A CN114184222 A CN 114184222A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
Abstract
The invention discloses a method and a device for detecting powder accumulation fire resistance of a pulverized coal pipe, wherein the method comprises the following steps: monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time; judging the deposition amount of pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judging whether the deposition amount of pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature; the alarm state of the alarm is determined according to the deposition amount of the pulverized coal or the preset temperature threshold, and by the method, the condition in the pulverized coal pipe can be accurately monitored on line, so that the safety and stability of the production process are ensured.
Description
Technical Field
The application relates to the technical field of power station boilers, in particular to a method and a device for detecting powder accumulation fire prevention of a pulverized coal pipe
Background
The production characteristics of the thermal power plant are that stable and reliable electric power is provided for the society, and the characteristics determine that the production process must be reliable, stable and safe. For a coal-fired boiler combustion system, the timely discovery of the fire hazard of the boiler combustion system is an important component of fire prevention of a thermal power plant, and due to the characteristics of easy spontaneous combustion of coal, improper operation and other factors, the coal powder tube is easy to accumulate powder to cause fire.
At present, the technical scheme of the existing power station boiler fire prevention technology mainly comprises the steps of using a monitoring camera and a fire smoke alarm in a boiler area, and judging the fire condition by monitoring a camera shooting picture and simultaneously acquiring an alarm signal of the smoke alarm. However, in long-term operation, due to the factors of poor field environment, high temperature, much dust and the like, the number of false alarms is large, and great burden is brought to field maintenance. The normal working conditions of the camera and the fire alarm probe can only be found after the fire is formed, and the effective early warning effect cannot be achieved. The coal powder pipe fire often causes the fire range to be enlarged and further causes personal safety accidents and serious equipment loss due to the fact that the fire is discovered and treated untimely.
Therefore, how to accurately detect the condition in the pulverized coal pipe on line and ensure the safety and stability of the production process is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a fire-proof detection method for accumulated powder of a pulverized coal pipe, which is used for solving the technical problem of potential safety hazard in the production process caused by the fact that the condition in the pulverized coal pipe cannot be accurately detected in the prior art, and comprises the following steps:
monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time;
judging the deposition amount of pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judging whether the deposition amount of pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature;
determining the alarm state of an alarm according to the deposition amount of the pulverized coal or a preset temperature threshold;
and subtracting the first primary wind speed from the second primary wind speed to determine the relative deviation amount of the primary wind speed, and subtracting the first pipe wall temperature from the primary wind temperature to determine the relative deviation amount of the temperature.
Preferably, the alarm state of the alarm is determined according to the deposition amount of the pulverized coal, and specifically comprises the following steps:
when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both smaller than a coal dust deposition threshold value, determining that the coal dust deposition amount does not reach an alarm state;
when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both larger than or equal to the coal dust deposition threshold value, determining that the coal dust deposition amount reaches an alarm state;
and when the deposition amount of the pulverized coal reaches an alarm state, starting the smoke purifying fan to enable the pressure of the purified smoke in the smoke purifying pipeline to be higher than the primary air pressure in the pulverized coal pipe.
Preferably, start net flue gas fan so that the net flue gas pressure in the net flue gas pipeline is higher than after the intraductal primary air pressure of buggy, still include:
when the pressure of the clean flue gas in the clean flue gas pipeline is higher than the primary air pressure in the pulverized coal pipe, opening an isolation valve of the clean flue gas pipeline;
and when the primary wind speed relative deviation and the temperature relative deviation are both smaller than the coal dust deposition threshold, closing the purified flue gas pipeline isolation valve and stopping the purified flue gas fan.
Preferably, the alarm state of the alarm is determined according to a preset temperature threshold, specifically:
when the minimum value of the first heating rate, the second heating rate and the third heating rate is greater than or equal to a preset temperature threshold value, an alarm sends out an alarm signal;
when the alarm sends out an alarm signal, the clean flue gas fan is started so that the clean flue gas pressure of the clean flue gas pipeline is higher than the primary air pressure in the pulverized coal pipe.
Preferably, after the smoke purifying fan is started to make the smoke purifying pressure of the smoke purifying pipeline higher than the primary air pressure in the pulverized coal pipe, the method further includes:
when the net smoke pressure in the net smoke pipeline is higher than the primary air pressure in the pulverized coal pipe, opening the isolation valve of the net smoke pipeline and increasing the net smoke flow in the net smoke pipeline so as to enable the volume fraction of oxygen at the outlet of the pulverized coal pipe to reach a preset oxygen volume fraction;
and when the minimum value of the first heating rate, the second heating rate and the third heating rate is smaller than a preset temperature threshold value, closing the clean flue gas pipeline isolation valve and stopping the clean flue gas fan.
Preferably, the primary wind speed measuring device is arranged on the central line of the pulverized coal pipe and the bottom of the pulverized coal pipe and is used for measuring the first primary wind speed and the second primary wind speed.
Preferably, a purified smoke volume control device and a purified smoke pressure control device are arranged in the purified smoke pipeline and used for controlling the purified smoke volume and the purified smoke pressure.
Preferably, the temperature measuring device is arranged at the periphery air pipeline, the central line of the pulverized coal pipe and the bottom of the pulverized coal pipe and is used for measuring the primary air temperature, the first pipe wall temperature and the second pipe wall temperature.
Preferably, the oxygen volume fraction measuring device is disposed at the outlet of the pulverized coal pipe and the clean flue gas pipeline, and is configured to measure the oxygen volume fraction in the outlet of the pulverized coal pipe and the clean flue gas pipeline.
Correspondingly, the invention also provides a pulverized coal pipe accumulated powder fire protection device, which comprises:
the monitoring module is used for monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time;
the judgment module is used for judging the deposition amount of the pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature and judging whether the deposition amount of the pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature;
the alarm module is used for determining the alarm state of the alarm according to the deposition amount of the pulverized coal or a preset temperature threshold;
and subtracting the first primary wind speed from the second primary wind speed to determine the relative deviation amount of the primary wind speed, and subtracting the first pipe wall temperature from the primary wind temperature to determine the relative deviation amount of the temperature.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method and a device for detecting powder accumulation fire resistance of a pulverized coal pipe, wherein the method comprises the following steps: monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time; judging the deposition amount of pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judging whether the deposition amount of pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature; the alarm state of the alarm is determined according to the deposition amount of the pulverized coal or the preset temperature threshold, and by the method, the condition in the pulverized coal pipe can be accurately monitored on line, so that the safety and stability of the production process are ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for detecting powder accumulation fire prevention of a pulverized coal pipe according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram illustrating a method for detecting powder accumulation and fire prevention of a pulverized coal pipe according to an embodiment of the present invention;
FIG. 3 is a schematic view of a circumferential air duct according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an internal structure of a pulverized coal pipe according to an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a device for detecting powder accumulation and fire prevention of a pulverized coal pipe according to an embodiment of the present invention.
In the figure: 1. a burner; 2. a pulverized coal pipe; 3. a coal mill; 4. a flue gas purifying fan; 5. a flue gas cleaning pipeline; 6. an oxygen volume fraction measuring device; 7. a temperature measuring device; 8. a primary wind speed measuring device; 9. a purified smoke amount control device; 10. a clean smoke pressure control device; 11. a signal transmission line; 12. a processor; 13. an alarm; 14. a perimeter air duct; 15. a clean flue gas pipeline isolation valve; 16. a coal-fired boiler; 17. a desulfurization unit; 18. an outlet flue of the desulfurization device; 19. and (4) a chimney.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
As described in the background art, in the prior art, a monitoring camera and a fire smoke alarm are used in a boiler area, and a fire situation is judged by monitoring a camera shooting picture and simultaneously acquiring an alarm signal of the smoke alarm. However, this method cannot provide an effective warning function.
In order to solve the above problem, in an embodiment of the present application, a method for detecting powder accumulation fire of a pulverized coal pipe is provided, as shown in fig. 1, the method includes:
s101, monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe 2, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe 2 and the second pipe wall temperature of the peripheral air pipeline 14 in real time.
Specifically, as shown in fig. 2 to 4, the pulverized coal pipe 2 connects the burner 1 and the coal pulverizer 3, the clean flue gas pipe 5 connects the desulfurization device outlet flue 18 and the pulverized coal pipe 2, the clean flue gas fan 4 is disposed on the clean flue gas pipe 5, the clean flue gas pipe 5 is provided with the clean flue gas pipe isolation valve 15, the desulfurization device outlet flue 18 connects the desulfurization device 17 and the chimney 19, the peripheral air pipe 14 is disposed around the burner 1, and the burner 1 is disposed on the coal-fired boiler 16. The processor 12 is connected with the clean smoke fan 4, the oxygen volume fraction measuring device 6, the temperature measuring device 7, the primary air speed measuring device 8, the clean smoke volume control device 9, the clean smoke pressure control device 10, the alarm 13 and the clean smoke pipeline isolation valve 14 through a signal transmission line 11. By arranging the temperature measuring device 7 and the primary air speed measuring device 8, the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe 2, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe 2 and the second pipe wall temperature of the peripheral air pipeline 14 can be monitored in real time through the controller.
In order to accurately measure the first primary wind speed and the second primary wind speed, in a preferred embodiment of the present disclosure, the primary wind speed measuring device 8 is disposed on the central line of the pulverized coal pipe 2 and the bottom of the pulverized coal pipe 2, and is configured to measure the first primary wind speed and the second primary wind speed.
Specifically, the primary wind speed measuring device 8 is disposed on the center line of the pulverized coal pipe 2 and the bottom of the pulverized coal pipe 2, and is configured to measure a first primary wind speed and a second primary wind speed, that is, a primary wind speed at the center line of the pulverized coal pipe 2 and a primary wind speed at the bottom of the pulverized coal pipe 2.
In order to accurately measure the primary air temperature, the first pipe wall temperature and the second pipe wall temperature, in a preferred embodiment of the present disclosure, the temperature measuring device 7 is disposed at the peripheral air duct 14, the central line of the pulverized coal pipe 2 and the bottom of the pulverized coal pipe 2, and is configured to measure the primary air temperature, the first pipe wall temperature and the second pipe wall temperature.
Specifically, the temperature measuring device 7 is disposed at the peripheral air duct 14, the centerline of the pulverized coal pipe 2, and the bottom of the pulverized coal pipe 2, and is configured to measure a primary air temperature at the centerline of the pulverized coal pipe 2, a first pipe wall temperature at the bottom of the pulverized coal pipe 2, and a second pipe wall temperature in the peripheral air duct 14.
S102, judging the deposition amount of the pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judging whether the deposition amount of the pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature.
Specifically, the expression of the primary wind speed relative deviation amount is as follows: Δ v1＝(v1-v2)/v1Wherein v is1The first primary wind speed of the central line of the pulverized coal pipe 2 is given by the unit: m/s; v. of2The second primary air speed at the bottom of the pulverized coal pipe 2 is given by the unit: m/s. The expression for the relative deviation of temperature is: Δ t1＝(t1-t2)/t1Wherein, t1Is the primary air temperature of the central line of the pulverized coal pipe 2, and the unit is as follows: k; t is t2Is a first pipe at the bottom of the pulverized coal pipe 2Wall temperature, in units of: K. and judging the deposition amount of the pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature. And judging whether the preset temperature threshold is reached according to the first temperature rising rate of the primary air temperature, the second temperature rising rate of the first pipe wall temperature and the third temperature rising rate of the second pipe wall temperature.
S103, determining the alarm state of the alarm 13 according to the coal dust deposition amount or the preset temperature threshold.
Specifically, the alarm state of the alarm 13 is determined according to the deposition amount of pulverized coal or a preset temperature threshold.
In order to ensure the safe operation of the unit, in the preferred embodiment of the present solution, the alarm state of the alarm 13 is determined according to the deposition amount of pulverized coal, specifically:
when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both smaller than a coal dust deposition threshold value, determining that the coal dust deposition amount does not reach an alarm state;
when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both larger than or equal to the coal dust deposition threshold value, determining that the coal dust deposition amount reaches an alarm state;
when the coal dust deposition amount reaches an alarm state, the clean flue gas fan 4 is started to enable the clean flue gas pressure of the clean flue gas pipeline 5 to be higher than the primary air pressure in the coal dust pipe 2.
Specifically, when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both smaller than the coal dust deposition threshold, it is indicated that the coal dust deposition amount does not have a risk on the operation of the unit at the moment, and the alarm 13 cannot be started at the moment; when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both larger than or equal to the coal dust deposition threshold value, determining that the coal dust deposition amount reaches an alarm state; at the moment, potential safety hazards exist, the flow speed of the pulverized coal pipeline is reduced before the combustor 1 is subjected to a fire accident, and when the pulverized coal pipeline is reduced to a certain degree, pulverized coal is deposited at the bottom of the pulverized coal pipeline due to the fact that the carrying capacity of pulverized coal airflow of the pulverized coal pipeline is reduced. If not discovered in time, the deposited coal powder can be caused to naturally heat, and the ignition coal powder airflow can cause fire to happen. When the coal dust deposition amount is detected to reach the alarm state, the processor 12 controls the alarm 13 to send out an alarm signal, and the clean flue gas fan 4 is started so that the clean flue gas pressure of the clean flue gas pipeline 5 is higher than the primary air pressure in the coal dust pipe 2. The fire disaster can be effectively avoided.
In order to control the deposition amount of the pulverized coal, in a preferred embodiment of the present invention, after the clean flue gas fan 4 is started to make the pressure of the clean flue gas in the clean flue gas duct 5 higher than the primary air pressure in the pulverized coal pipe 2, the method further includes:
when the net flue gas pressure in the net flue gas pipeline 5 is higher than the primary air pressure in the pulverized coal pipe 2, opening a net flue gas pipeline isolation valve;
and when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both smaller than the coal dust deposition threshold value, closing the clean flue gas pipeline isolation valve 15 and stopping the clean flue gas fan 4.
Specifically, when the clean flue gas pressure in the clean flue gas pipeline 5 is higher than the primary air pressure in the pulverized coal pipe 2, the clean flue gas pipeline isolation valve 15 is opened, the clean flue gas pressure in the clean flue gas pipeline 5 is continuously improved, and until the primary air speed relative deviation and the temperature relative deviation are both smaller than the pulverized coal deposition threshold value, the processor 12 judges that no pulverized coal deposition exists at the bottom of the pulverized coal pipe 2, closes the clean flue gas pipeline isolation valve 15, and stops the clean flue gas fan 4.
In order to determine whether the pulverized coal pipe 2 is in fire, in a preferred embodiment of the present disclosure, the alarm state of the alarm is determined according to a preset temperature threshold, specifically:
when the minimum value of the first heating rate, the second heating rate and the third heating rate is greater than or equal to a preset temperature threshold value, the alarm 13 sends out an alarm signal;
when the alarm 13 sends out an alarm signal, the smoke purifying fan 4 is started so that the pressure of the clean smoke pipeline 5 is higher than the primary air pressure in the pulverized coal pipe 2.
Specifically, when the first heating rate of a wind temperature, the second heating rate of first pipe wall temperature, minimum more than or equal to in the third heating rate of second pipe wall temperature predetermines the temperature threshold value when, then treater 12 judges that 2 departments of buggy pipe are conflagration breaks out, and treater 12 control alarm 13 sends alarm signal, starts clean flue gas fan 4 so that the clean flue gas pressure of clean flue gas pipeline 5 is higher than a wind pressure in the buggy pipe 2.
In order to extinguish the fire, in the preferred embodiment of the present invention, after the clean flue gas blower 4 is started to make the clean flue gas pressure in the clean flue gas duct 5 higher than the primary air pressure in the pulverized coal pipe 2, the method further comprises:
when the net smoke pressure in the net smoke pipeline 5 is higher than the primary air pressure in the pulverized coal pipe 2, opening the net smoke pipeline isolation valve 15 and increasing the net smoke flow in the net smoke pipeline 5 so as to enable the volume fraction of the oxygen at the outlet of the pulverized coal pipe 2 to reach the preset oxygen volume fraction;
and when the minimum value of the first heating rate, the second heating rate and the third heating rate is smaller than a preset temperature threshold value, closing the clean flue gas pipeline isolation valve 15 and stopping the clean flue gas fan 4.
Specifically, work as net flue gas pressure in the clean flue gas pipeline 5 is higher than behind the 2 interior wind pressures of buggy pipe, open clean flue gas pipeline isolating valve 15 improves clean flue gas volume in the clean flue gas pipeline 5, the expression of clean flue gas volume of clean flue gas pipeline 5 is: q2 is q1 (gamma 1-gamma 2)/(gamma 3-gamma 2), wherein q1 is the amount of air in the coal powder tube 2 before the clean flue gas is sprayed; gamma 1 is the volume fraction of oxygen in the air in the pulverized coal pipe 2 before the clean flue gas is sprayed; gamma 2 is the volume fraction of oxygen after spraying the clean flue gas; and gamma 3 is a preset oxygen volume fraction. And increasing the clean smoke volume of the clean smoke pipeline 5 to enable the volume fraction of oxygen at the outlet of the pulverized coal pipe 2 to reach a preset volume fraction of oxygen, wherein the preset volume fraction of oxygen needs to be controlled below 10%, maintaining the clean smoke volume until the minimum value of the first temperature rise rate, the second temperature rise rate and the third temperature rise rate is smaller than a preset temperature threshold value, judging that the pulverized coal pipe is not in fire by the processor 12, closing the clean smoke pipeline isolation valve 15 and stopping the clean smoke fan 4.
In order to ensure the safety and stability of the production process, in the preferred embodiment of the present disclosure, a purified smoke amount control device 9 and a purified smoke pressure control device 10 are disposed in the purified smoke pipeline 5, and are used for controlling the purified smoke amount and the purified smoke pressure.
Specifically, a purified smoke amount control device 9 is provided in the purified smoke line 5 for controlling the purified smoke amount, and a purified smoke pressure control device 10 is provided in the purified smoke line 5 for controlling the purified smoke pressure. Through the purified smoke volume control device 9 and the purified smoke pressure control device 10, when fire disaster or coal dust deposition occurs, the safe and stable operation of the power plant can be ensured.
In order to detect the oxygen volume fraction in the clean flue gas duct 5, in a preferred embodiment of the present scheme, an oxygen volume fraction measuring device 6 is disposed at the outlet of the pulverized coal pipe 2 and the clean flue gas duct 5, and is used for measuring the oxygen volume fraction in the outlet of the pulverized coal pipe 2 and the clean flue gas duct 5.
By applying the technical scheme, the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline are monitored in real time; judging the deposition amount of pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judging whether the deposition amount of pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature; the alarm state of the alarm is determined according to the deposition amount of the pulverized coal or the preset temperature threshold, and by the method, the condition in the pulverized coal pipe can be accurately monitored on line, so that the safety and stability of the production process are ensured.
In order to further explain the technical idea of the present application, the technical solution of the present application is now described with reference to specific application scenarios.
The processor 12 judges whether the coal powder is deposited at the bottom of the coal powder pipe 2 according to the measured primary wind temperature and primary wind speed of the central line of the coal powder pipe 2, the primary wind speed at the bottom of the coal powder pipe 2 and the pipe wall temperature, if the relative deviation of the primary wind speed and the temperature is more than or equal to the coal powder deposition threshold, the processor 12 judges that the pulverized coal is deposited in the pulverized coal pipe 2, the processor 12 controls the alarm 13 to send out an alarm signal, the clean flue gas fan 4 is started, when the clean flue gas pressure of the clean flue gas pipeline 5 is higher than the primary air pressure in the pulverized coal pipe 2, the clean flue gas pipeline isolation valve 15 is opened, the clean flue gas pressure of the clean flue gas pipeline 5 is continuously increased until the primary air speed relative deviation and the temperature relative deviation are smaller than the pulverized coal deposition threshold value, the processor 12 judges that no pulverized coal is deposited at the bottom of the pulverized coal pipe 2, the clean flue gas pipeline isolation valve 15 is closed, and the clean flue gas fan 4 is stopped.
The processor 12 judges whether the pulverized coal pipe 2 is in fire according to the measured pipe wall temperature of the peripheral air pipeline 14, the primary air temperature of the central line of the pulverized coal pipe 2 and the pipe wall temperature at the bottom of the pulverized coal pipe 2, if the minimum value of the temperature rise rates is greater than or equal to a preset temperature threshold value, the processor 12 judges that the pulverized coal pipe 1 is in fire, the processor 12 controls the alarm 13 to send out an alarm signal, the clean flue gas fan 4 is started, the clean flue gas pressure of the flue gas pipeline 5 to be cleaned is higher than the primary air pressure in the pulverized coal pipe 2, the clean flue gas pipeline isolation valve 15 is opened, the clean flue gas flow of the clean flue gas pipeline 5 is continuously increased, the oxygen volume fraction at the outlet of the pulverized coal pipe 2 reaches a preset oxygen volume fraction, the preset oxygen volume fraction needs to be controlled below 10%, the clean flue gas flow is maintained until the minimum value of the temperature rise rates is smaller than a preset temperature threshold value, and the processor 12 judges that the fire in the pulverized coal pipe is extinguished, and closing the clean flue gas pipeline isolation valve 15 and stopping the clean flue gas fan 4.
In order to achieve the above technical object, an embodiment of the present application further provides a pulverized coal deposited pipe fire protection device, as shown in fig. 5, the device including:
the monitoring module 201 is used for monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time;
the judging module 202 is configured to judge the deposition amount of pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judge whether a preset temperature threshold is reached according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature, and a third temperature rise rate of the second pipe wall temperature;
the alarm module 203 is used for determining the alarm state of the alarm according to the deposition amount of the pulverized coal or a preset temperature threshold;
and subtracting the first primary wind speed from the second primary wind speed to determine the relative deviation amount of the primary wind speed, and subtracting the first pipe wall temperature from the primary wind temperature to determine the relative deviation amount of the temperature.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for detecting powder accumulation fire prevention of a pulverized coal pipe is characterized by comprising the following steps:
monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time;
judging the deposition amount of pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature, and judging whether the deposition amount of pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature;
determining the alarm state of an alarm according to the deposition amount of the pulverized coal or a preset temperature threshold;
and subtracting the first primary wind speed from the second primary wind speed to determine the relative deviation amount of the primary wind speed, and subtracting the first pipe wall temperature from the primary wind temperature to determine the relative deviation amount of the temperature.
2. The method according to claim 1, characterized in that the alarm state of the alarm is determined according to the coal dust deposition amount, specifically:
when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both smaller than a coal dust deposition threshold value, determining that the coal dust deposition amount does not reach an alarm state;
when the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature are both larger than or equal to the coal dust deposition threshold value, determining that the coal dust deposition amount reaches an alarm state;
and when the deposition amount of the pulverized coal reaches an alarm state, starting the smoke purifying fan to enable the pressure of the purified smoke in the smoke purifying pipeline to be higher than the primary air pressure in the pulverized coal pipe.
3. The method of claim 2, wherein after activating the clean flue gas blower such that the net flue gas pressure in the clean flue gas duct is higher than the primary air pressure in the pulverized coal duct, further comprising:
when the pressure of the clean flue gas in the clean flue gas pipeline is higher than the primary air pressure in the pulverized coal pipe, opening an isolation valve of the clean flue gas pipeline;
and when the primary wind speed relative deviation and the temperature relative deviation are both smaller than the coal dust deposition threshold, closing the purified flue gas pipeline isolation valve and stopping the purified flue gas fan.
4. Method according to claim 1, characterized in that the alarm state of the alarm is determined according to a preset temperature threshold, in particular:
when the minimum value of the first heating rate, the second heating rate and the third heating rate is greater than or equal to a preset temperature threshold value, an alarm sends out an alarm signal;
when the alarm sends out an alarm signal, the clean flue gas fan is started so that the clean flue gas pressure of the clean flue gas pipeline is higher than the primary air pressure in the pulverized coal pipe.
5. The method of claim 4, wherein after the clean flue gas blower is activated such that the clean flue gas pressure in the clean flue gas duct is higher than the primary air pressure in the pulverized coal duct, the method further comprises:
when the net smoke pressure in the net smoke pipeline is higher than the primary air pressure in the pulverized coal pipe, opening the isolation valve of the net smoke pipeline and increasing the net smoke flow in the net smoke pipeline so as to enable the volume fraction of oxygen at the outlet of the pulverized coal pipe to reach a preset oxygen volume fraction;
and when the minimum value of the first heating rate, the second heating rate and the third heating rate is smaller than a preset temperature threshold value, closing the clean flue gas pipeline isolation valve and stopping the clean flue gas fan.
6. The method of claim 1, wherein a primary wind speed measuring device is disposed at a centerline of the pulverized coal pipe and a bottom of the pulverized coal pipe for measuring the first primary wind speed and the second primary wind speed.
7. The method of claim 1, wherein a net flue gas volume control device and a net flue gas pressure control device are disposed within the net flue gas duct for controlling the net flue gas volume and the net flue gas pressure.
8. The method of claim 1, wherein temperature measuring devices are disposed at the perimeter air duct, the centerline of the pulverized coal pipe, and the bottom of the pulverized coal pipe for measuring the primary air temperature, the first pipe wall temperature, and the second pipe wall temperature.
9. The method of claim 1, wherein an oxygen volume fraction measuring device is disposed at the pulverized coal pipe outlet and the clean flue gas duct for measuring the oxygen volume fraction in the pulverized coal pipe outlet and the clean flue gas duct.
10. A soot tube powder accumulation fire protection device, comprising:
the monitoring module is used for monitoring the primary air temperature and the first primary air speed of the central line of the pulverized coal pipe, the first pipe wall temperature and the second primary air speed of the bottom of the pulverized coal pipe and the second pipe wall temperature of the peripheral air pipeline in real time;
the judgment module is used for judging the deposition amount of the pulverized coal according to the relative deviation amount of the primary wind speed and the relative deviation amount of the temperature and judging whether the deposition amount of the pulverized coal reaches a preset temperature threshold value according to a first temperature rise rate of the primary wind temperature, a second temperature rise rate of the first pipe wall temperature and a third temperature rise rate of the second pipe wall temperature;
the alarm module is used for determining the alarm state of the alarm according to the deposition amount of the pulverized coal or a preset temperature threshold;
and subtracting the first primary wind speed from the second primary wind speed to determine the relative deviation amount of the primary wind speed, and subtracting the first pipe wall temperature from the primary wind temperature to determine the relative deviation amount of the temperature.
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