Electric heating energy coordinated thermal power plant boiler combustion stability index prediction method
By defining and predicting the combustion stability index of boilers in thermal power plants, the problem of difficulty in monitoring and predicting combustion stability in the prior art is solved, effective prediction and adjustment of the combustion state of the boiler is achieved, and boiler operation efficiency and equipment life are improved.
Patent Information
- Application Number
- CN202411712217.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-03-04
AI Technical Summary
The prior art is difficult to effectively monitor and predict the combustion stability of boilers in thermal power plants, resulting in reduced boiler efficiency, increased pollutant emissions and shortened equipment life.
By defining the combustion stationary index of boiler of thermal power plant coordinated with electric and thermal energy, and establishing corresponding time series data, performing data normalization processing and influencing factor calculation, the combustion stationary index at the next moment is finally predicted to adjust the heat discharge power of the heat storage device.
It realizes the prediction of the combustion stability of boilers in thermal power plants, and can timely adjust the heat release power of the heat storage device, maintain combustion stability, extend the service life of the equipment, and reduce operating costs.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to the field of energy coordination, and in particular to a method for predicting a combustion stability index of a boiler in a thermal power plant with electric and thermal energy coordination. Background Art
[0002] With the continuous growth of global energy demand and the increasing attention to environmental protection, improving energy efficiency and reducing pollution emissions have become major challenges facing the world today. In my country, driven by the adjustment of energy structure and energy conservation and emission reduction policies, thermal power plants, as the main energy conversion facilities, have received extensive attention for their operating efficiency and environmental performance.
[0003] The combustion stability of thermal power plant boilers is one of the key factors affecting power generation efficiency and environmental protection indicators. As the main equipment in the power generation process of thermal power plants, the combustion state of the boiler directly affects the efficiency of the generator set and the safety and stability of the boiler. In actual operation, fluctuations in combustion stability may lead to problems such as reduced boiler efficiency, increased pollutant emissions, and shortened equipment life. Therefore, it is very important to maintain the stable operation of thermal power plant boilers.
[0004] The combustion stability of thermal power plant boilers reflects the working efficiency of thermal power plant generators. By analyzing the combustion stability of thermal power plant boilers, the operating status of thermal power plant boilers can be reflected, and then the thermal storage device of the thermal power plant can be adjusted to coordinate the electric and thermal energy of the thermal power plant and ensure the safe and stable operation of the power grid. At present, there are still deficiencies in the research on monitoring the internal combustion of thermal power plant boilers at home and abroad. In view of this problem, it is necessary to determine a method for predicting the combustion stability index of thermal power plant boilers that can predict the coordination of electric and thermal energy by studying the combustion stability of thermal power plant boilers. Summary of the invention
[0005] In view of the deficiencies of the above-mentioned prior art, the present invention proposes a method for predicting the combustion stability index of a thermal power plant boiler with coordinated electric and thermal energy. By predicting the combustion stability index of a thermal power plant boiler with coordinated electric and thermal energy, the heat release power of the thermal power plant heat storage device is changed to maintain the stable operation of the thermal power plant boiler combustion.
[0006] To achieve the above object, the present invention provides the following technical solutions:
[0007] Step 1: Define the combustion stability index of thermal power plant boilers for electric and thermal energy coordination:
[0008]
[0009] Where t1, t2, ..., t v ,...,t n is a fixed time interval, n is a natural number, n=1,2,...,v is a natural number, v∈{1,2,...,n}, t v The furnace temperature of the thermal power plant boiler at time Tl hdcmax for t1,t2,...,t v ,...,t n The maximum value of the furnace temperature of the thermal power plant boiler at these n fixed time intervals is t v Steam temperature at the outlet of the superheater of the thermal power plant boiler at the moment, Tz hdcmax for t1,t2,...,t v ,...,t n The maximum value of the steam temperature at the outlet of the boiler superheater of the thermal power plant at these n fixed time intervals is t v Thermal power plant boiler heat generation efficiency at time, η hdcmax for t1,t2,...,t v ,...,t n The maximum value of the thermal efficiency of the thermal power plant boiler at these n fixed time intervals is: t v Heat output of thermal power plant boiler at the moment, Qg hdcmax for t1,t2,...,t v ,...,t n The maximum heat output of the thermal power plant boiler at these n fixed time intervals is t v The heat consumption rate of the generating units in the thermal power plant at the moment, Φ hdcmax for t1,t2,...,t v ,...,t n The maximum value of the heat rate of the thermal power plant's generator set at these n fixed time intervals.
[0010] Step 2: Establish the time series of various data required for the combustion stability index of thermal power plant boilers with coordinated electric and thermal energy:
[0011] At n fixed time intervals t1, t2, ..., t v ,...,t n , where n is a natural number, n = 1, 2, ..., v is a natural number, v ∈ {1, 2, ..., n}, and the various data required for the combustion stability index of the thermal power plant boiler coordinated with electric and thermal energy are measured to obtain the furnace temperature of the thermal power plant boiler Steam temperature at the outlet of the superheater of a thermal power plant boiler Thermal power plant boiler heat generation efficiency Thermal power plant boiler heat output Thermal power plant generator heat rate Time series of measurements:
[0012]
[0013] Step 3: Normalize the measured data and normalize each data
[0014] Normalize all data to get the normalized value of the furnace temperature of the thermal power plant boiler Normalized value of steam temperature at outlet of boiler superheater in thermal power plant Normalized value of thermal efficiency of boilers in thermal power plants Normalized value of heat output of boiler in thermal power plant Normalized value of heat rate of generating units in thermal power plants
[0015]
[0016] Where, Tl hdcmax , Tz hdcmax , η hdcmax , Qg hdcmax , Φ hdcmax They are respectively the furnace temperature of the thermal power plant boiler, the outlet steam temperature of the thermal power plant boiler superheater, the thermal power plant boiler heat production efficiency, the thermal power plant boiler heat production, and the thermal power plant generator heat consumption rate. v ,...,t n The maximum value among the measured values at these n fixed time intervals; Tl hdcmin , Tz hdcmin , η hdcmin , Qg hdcmin , Φ hdcmin They are respectively the furnace temperature of the thermal power plant boiler, the outlet steam temperature of the thermal power plant boiler superheater, the thermal power plant boiler heat production efficiency, the thermal power plant boiler heat production, and the thermal power plant generator heat consumption rate. v ,...,t n The minimum value among the measurements at these n fixed time intervals.
[0017] Step 4: Calculate the influence factors of the combustion stability related parameters of the thermal power plant boiler coordinated with electric and thermal energy on the combustion stability index of the thermal power plant boiler coordinated with electric and thermal energy at the next moment:
[0018]
[0019] In the formula, It is the influence factor of the furnace temperature of the thermal power plant boiler on the combustion stability index of the thermal power plant boiler coordinated with the electric and thermal energy at the next moment; It is the influence factor of thermal power plant boiler heat production efficiency on the thermal power plant boiler combustion stability index of the next moment of electric heat energy coordination; It is the influencing factor of the heat production of the thermal power plant boiler on the combustion stability index of the thermal power plant boiler coordinated with the electric and thermal energy at the next moment.
[0020] Step 5: Calculate the combustion stability index GLR of the thermal power plant boiler with coordinated electric and thermal energy at the next moment hdc,pre :
[0021]
[0022] If the predicted value of the combustion stability index of the thermal power plant boiler coordinated with electric heat energy at the next moment is greater than or equal to 0.593, it is considered that the thermal power plant boiler will burn stably at the next moment, and the heat release power of the current thermal power plant heat storage device needs to be maintained at this time; if the predicted value of the combustion stability index of the thermal power plant boiler at the next moment is less than 0.593, it is considered that the thermal power plant boiler will burn unstable at the next moment, and the heat energy output will decrease. At this time, it is necessary to increase the heat release power of the thermal power plant heat storage device to ensure power supply.
[0023] The beneficial effects of adopting the above technical solution are:
[0024] Compared with the prior art, for the problem of predicting the combustion stability of the boiler in a thermal power plant coordinated with electric and thermal energy, the method of the present invention can judge the combustion stability of the boiler in the thermal power plant at the next moment, and adjust the heat release power of the heat storage device at the next moment according to the prediction result, so as to maintain the combustion stability of the boiler in the thermal power plant, reduce the loss of boiler equipment, extend the service life of the boiler and its ancillary equipment, reduce the cost of equipment replacement and maintenance, reduce the operating cost of the thermal power plant, and improve the economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 Flowchart of the method for predicting the combustion stability index of a thermal power plant boiler for electric and thermal energy coordination. DETAILED DESCRIPTION
[0026] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in the application.
[0027] The combustion stability of a boiler in a thermal power plant is selected as an example for further explanation and analysis. v ,...,t n The furnace temperature of the thermal power plant boiler, the outlet steam temperature of the thermal power plant boiler superheater, the thermal efficiency of the thermal power plant boiler, the heat output of the thermal power plant boiler, and the heat consumption rate of the thermal power plant generator set are measured. Take the fixed time interval as 30 minutes and the number of measurements as 10, that is, n = 10, then at t1, t2, t3, t4, t5, t6, t7, t8, t9, t 10 The measurement data results of these 10 moments are as follows:
[0028]
[0029] According to the measured data of formula (6), t1, t2, t3, t4, t5, t6, t7, t8, t9, t 10 The maximum and minimum values of the furnace temperature of the thermal power plant boiler at these 10 fixed time intervals are Tl hdcmax , Tl hdcmin ; Maximum and minimum values of steam temperature at the outlet of the superheater of a thermal power plant boiler Tz hdcmax , Tz hdcmin ; Maximum and minimum values of thermal efficiency of boilers in thermal power plants η hdcmax , η hdcmin ; Maximum and minimum heat output of thermal power plant boilers Qg hdcmax , Qg hdcmin ; Maximum and minimum values of heat rate of generating units in thermal power plants Φ hdcmax , Φ hdcmin Then the collected data is normalized according to formula (3), and the data processing results are as follows:
[0030]
[0031] Step 4: Calculate the influence factors of the parameters related to the combustion stability of the thermal power plant boiler coordinated by electric and thermal energy on the parameters related to the combustion stability of the thermal power plant boiler coordinated by electric and thermal energy at the next moment:
[0032]
[0033] Where v is a natural number, v∈[1,10].
[0034] According to formula (8), t1, t2, t3, t4, t5, t6, t7, t8, t9, t 10 The factors affecting the parameters related to the combustion stability of the thermal power plant boiler coordinated by the electric heat energy at these 10 fixed time intervals on the parameters related to the combustion stability of the thermal power plant boiler coordinated by the electric heat energy at the next moment are:
[0035] Step 5: Calculate the combustion stability index GLR of the thermal power plant boiler with coordinated electric and thermal energy at the next moment hdc,pre :
[0036]
[0037] If the obtained thermal power plant boiler combustion stability index of electric heat energy coordination is 11If the predicted value is greater than or equal to 0.593, it is considered that the boiler combustion of the thermal power plant is stable at the next moment, and the heat release power of the current thermal power plant heat storage device needs to be maintained at this time; if the obtained thermal power plant boiler combustion stability index is at the next moment t 11 If the predicted value is less than 0.593, it is considered that the combustion of the boiler in the thermal power plant will be unstable at the next moment, and the heat output will decrease. At this time, it is necessary to increase the heat release power of the thermal storage device in the thermal power plant to ensure the power supply.
[0038] The above are merely embodiments of the present invention and are not intended to limit the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of the claims of the present invention.
Claims
1. A method for predicting the combustion stability index of a thermal power plant boiler with coordinated electric and thermal energy, characterized by: Step 1: Define the combustion stability index of thermal power plant boilers for electric and thermal energy coordination: Step 2: Establish the time series of various data required for the combustion stability index of thermal power plant boilers with coordinated electric and thermal energy: Step 3: Normalize the measured data and normalize each item of data; Step 4: Calculate the influence factor of the combustion stability related parameters of the thermal power plant boiler coordinated with electric and thermal energy on the combustion stability index of the thermal power plant boiler coordinated with electric and thermal energy at the next moment; Step 5: Calculate the combustion stability index GLR of the thermal power plant boiler with coordinated electric and thermal energy at the next moment hdc,pre .
2. The method for predicting the combustion stability index of a thermal power plant boiler with coordinated electric and thermal energy according to claim 1 is characterized in that: In the step 1, the specific method is Where t1, t2, ..., t v ,...,t n is a fixed time interval, n is a natural number, n=1,2,...,v is a natural number, v∈{1,2,...,n}, t v The furnace temperature of the thermal power plant boiler at time Tl hdcmax for t1,t2,...,t v ,...,t n The maximum value of the furnace temperature of the thermal power plant boiler at these n fixed time intervals is t v Steam temperature at the outlet of the superheater of the thermal power plant boiler at the moment, Tz hdcmax for t1,t2,...,t v ,...,t n The maximum value of the steam temperature at the outlet of the boiler superheater of the thermal power plant at these n fixed time intervals is t v Thermal power plant boiler heat generation efficiency at time, η hdcmax for t1,t2,...,t v ,...,t n The maximum value of the thermal efficiency of the thermal power plant boiler at these n fixed time intervals is: t v Heat output of thermal power plant boiler at the moment, Qg hdcmax for t1,t2,...,t v ,...,t n The maximum heat output of the thermal power plant boiler at these n fixed time intervals is t v The heat consumption rate of the generating units in the thermal power plant at the moment, Φ hdcmax for t1,t2,...,t v ,...,t n The maximum value of the heat rate of the thermal power plant's generator set at these n fixed time intervals.
3. The method for predicting combustion stability index of boilers in thermal power plants with coordinated electric and thermal energy according to claim 1 is characterized by: In the step 2, the specific method is At n fixed time intervals t1, t2, ..., t v ,...,t n , where n is a natural number, n = 1, 2, ..., v is a natural number, v ∈ {1, 2, ..., n}, and the various data required for the combustion stability index of the thermal power plant boiler coordinated with electric and thermal energy are measured to obtain the furnace temperature of the thermal power plant boiler Steam temperature at the outlet of the superheater of a thermal power plant boiler Thermal power plant boiler heat generation efficiency Thermal power plant boiler heat output Thermal power plant generator heat rate Time series of measurements:
4. The method for predicting combustion stability index of boilers in thermal power plants with coordinated electric and thermal energy according to claim 1 is characterized by: In the step 3, the specific method is Normalize all data to get the normalized value of the furnace temperature of the thermal power plant boiler Normalized value of steam temperature at outlet of boiler superheater in thermal power plant Normalized value of thermal efficiency of boilers in thermal power plants Normalized value of heat output of boiler in thermal power plant Normalized value of heat rate of generating units in thermal power plants Where, Tl hdcmax , Tz hdcmax , η hdcmax , Qg hdcmax , Φ hdcmax They are respectively the furnace temperature of the thermal power plant boiler, the outlet steam temperature of the thermal power plant boiler superheater, the thermal power plant boiler heat production efficiency, the thermal power plant boiler heat production, and the thermal power plant generator heat consumption rate. v ,...,t n The maximum value among the measured values at these n fixed time intervals; Tl hdcmin , Tz hdcmin , η hdcmin , Qg hdcmin , Φ hdcmin They are respectively the furnace temperature of the thermal power plant boiler, the outlet steam temperature of the thermal power plant boiler superheater, the thermal power plant boiler heat production efficiency, the thermal power plant boiler heat production, and the thermal power plant generator heat consumption rate. v ,...,t n The minimum value among the measurements at these n fixed time intervals.
5. The method for predicting combustion stability index of boilers in thermal power plants with coordinated electric and thermal energy according to claim 1 is characterized by: In the step 4, the specific method is: In the formula, It is the influence factor of the furnace temperature of the thermal power plant boiler on the combustion stability index of the thermal power plant boiler coordinated with the electric and thermal energy at the next moment; It is the influence factor of thermal power plant boiler heat production efficiency on the thermal power plant boiler combustion stability index of the next moment of electric heat energy coordination; It is the influencing factor of the heat production of the thermal power plant boiler on the combustion stability index of the thermal power plant boiler coordinated with the electric and thermal energy at the next moment.
6. The method for predicting the combustion stability index of a thermal power plant boiler with coordinated electric and thermal energy according to claim 1 is characterized by: In the step 5, the specific method is: If the predicted value of the combustion stability index of the thermal power plant boiler coordinated with electric heat energy at the next moment is greater than or equal to 0.593, it is considered that the thermal power plant boiler will burn stably at the next moment, and the heat release power of the current thermal power plant heat storage device needs to be maintained at this time; if the predicted value of the combustion stability index of the thermal power plant boiler at the next moment is less than 0.593, it is considered that the thermal power plant boiler will burn unstable at the next moment, and the heat energy output will decrease. At this time, it is necessary to increase the heat release power of the thermal power plant heat storage device to ensure power supply.