CN115470441A - Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series - Google Patents

Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series Download PDF

Info

Publication number
CN115470441A
CN115470441A CN202211147658.6A CN202211147658A CN115470441A CN 115470441 A CN115470441 A CN 115470441A CN 202211147658 A CN202211147658 A CN 202211147658A CN 115470441 A CN115470441 A CN 115470441A
Authority
CN
China
Prior art keywords
temperature
inlet
gas
exhaust gas
corrected
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.)
Pending
Application number
CN202211147658.6A
Other languages
Chinese (zh)
Inventor
徐凯
黄伟
孟桂祥
钟平
刘国兴
张怿
徐晖
王安庆
韩国庆
曹寿峰
王峰
聂雨
郑磊
单绍荣
宋金时
史燕红
张丁凡
高伟恒
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.)
Huaneng Suzhou Thermal Power Co ltd
Xian Thermal Power Research Institute Co Ltd
Suzhou Xire Energy Saving Environmental Protection Technology Co Ltd
Original Assignee
Huaneng Suzhou Thermal Power Co ltd
Xian Thermal Power Research Institute Co Ltd
Suzhou Xire Energy Saving Environmental Protection 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 Huaneng Suzhou Thermal Power Co ltd, Xian Thermal Power Research Institute Co Ltd, Suzhou Xire Energy Saving Environmental Protection Technology Co Ltd filed Critical Huaneng Suzhou Thermal Power Co ltd
Priority to CN202211147658.6A priority Critical patent/CN115470441A/en
Publication of CN115470441A publication Critical patent/CN115470441A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
    • G01K13/024—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Computational Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Pure & Applied Mathematics (AREA)
  • Databases & Information Systems (AREA)
  • Software Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Algebra (AREA)
  • Air Supply (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

The invention discloses a method for correcting the exhaust gas temperature of a gas-fired boiler connected with a gas heater in series, which comprises the following steps: obtaining a design value of the inlet gas temperature of the gas heater, a design value of the inlet air temperature of the air preheater and a design value of the water supply temperature; obtaining the following measured parameters from the measuring instrument: the gas heater inlet gas temperature measured value, the gas heater outlet final exhaust gas temperature, the gas heater inlet smoke temperature, the air preheater inlet air temperature measured value, the air preheater inlet smoke temperature, the water supply temperature measured value and the economizer inlet smoke temperature; and (4) considering the deviation of the measured value of the inlet gas temperature of the gas heater and the design value, the deviation of the measured value of the inlet air temperature of the air preheater and the design value and the deviation of the measured value of the feed water temperature and the design value, and obtaining the total corrected exhaust gas temperature. The correction method can calculate and obtain the corrected final exhaust gas temperature of the outlet of the gas heater more accurately, and has important significance for checking the exhaust gas temperature of the gas boiler and guiding the operation and optimization of the boiler.

Description

Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series
Technical Field
The invention belongs to the technical field of energy conservation and emission reduction of boilers, and particularly relates to a method for correcting the exhaust gas temperature of a gas-fired boiler connected with a gas heater in series.
Background
In recent years, with the increasing progress and popularization of blast furnace gas combustion technology, blast furnace gas-fired boilers are widely applied in iron and steel enterprises, and more iron and steel plants take blast furnace gas as main fuel of power station boilers from self-contained power plants. For a blast furnace gas boiler provided with a gas heater, a primary heating surface (the gas heater) is added to a tail flue of the blast furnace gas boiler. Because the gas heat exchanger system is low-temperature gas at the cold end and has a temperature difference equivalent to the temperature difference of the boiler exhaust smoke, the temperature of the exhaust smoke of the boiler can be greatly reduced, and the thermal efficiency of the boiler is improved; the blast furnace gas with low heating value is heated and then sent into the furnace chamber for combustion, so that the ignition and combustion conditions in the furnace can be improved, and the problems of difficult ignition, low furnace chamber temperature, unstable combustion and the like of a full-combustion blast furnace gas boiler can be solved. Therefore, the system is self-introduced to rapidly spread and apply to a wide range.
The boiler exhaust gas temperature is an important operation control index of the boiler and is also a key parameter influencing the thermal efficiency of the boiler, and the latter is a key index for unit performance assessment. For a gas boiler with a gas heater, because gas enters a hearth after being heated, the temperature boundary of exhaust gas needs to be set at the outlet of the gas heater instead of the outlet of an air preheater of a traditional boiler. Both GB10184 and ASME PTC 4 standards describe methods for correcting the flue gas temperature, but the calculation boundary of the flue gas temperature is at the air preheater exit location. The above two standards for correcting the flue gas temperature are not applicable to gas boilers with gas heaters.
The invention patent of the grant publication No. CN 104504290B provides a method for correcting the exhaust gas temperature of a blast furnace gas-fired boiler, which aims at: (1) the temperature of the inlet gas of the gas heater, and (2) the temperature of the inlet flue gas of the gas heater deviates from a guaranteed value, and then the temperature of the discharged flue gas is corrected. But the method has the defect that the influence on the exhaust gas temperature is not considered after the feed water temperature and the inlet smoke temperature of the air preheater deviate from the design value or the guaranteed value.
"Yeya lan et al. Blast furnace gas boiler thermal efficiency calculation method" thermal power generation "2015, volume 44 (3), pages 21-27" this paper also provides information on: (1) the temperature of the inlet gas of the gas heater, and (2) the temperature of the inlet flue gas of the gas heater deviates from a guaranteed value, and then the temperature of the discharged flue gas is corrected. The paper proposes: in fact, no matter the heat exchange parameter of the air preheater is changed due to the change of the air temperature at the inlet of the air preheater or the heat exchange parameter of the economizer is changed due to the change of the water supply temperature, the heat exchange of the gas heater is influenced by the change of the inlet flue gas temperature of the gas heater, and further the change of the exhaust gas temperature is caused. However, in the paper, the smoke temperature or the smoke temperature variation at the inlet of the gas heater after correction caused by the deviation of the feed water temperature and the air temperature at the inlet of the air preheater from the design values or the guaranteed values is not obtained, and the correction amount of the exhaust gas temperature is obtained only according to the actual smoke temperature and the actual values or the guaranteed values of the actual inlet of the gas heater. Therefore, the method in the paper has certain error for correcting the outlet smoke temperature of the gas heater.
In summary, it is highly desirable to construct a new exhaust gas temperature correction method to perform the exhaust gas temperature correction calculation of the gas boiler including the gas heater, so as to more accurately evaluate the operation economic indicators of the gas boiler.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for correcting the exhaust gas temperature of a gas-fired boiler connected with a gas heater in series, aiming at the condition that the inlet gas temperature of the gas heater, the inlet air temperature of an air preheater and the inlet water supply temperature of an economizer deviate from a design value or a guaranteed value, the corrected exhaust gas temperature of the outlet of the gas heater is obtained through more accurate calculation, and the method has important significance for checking the exhaust gas temperature of the gas-fired boiler and guiding the operation and optimization of the boiler.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a method for correcting the exhaust gas temperature of a gas-fired boiler connected with a gas heater in series comprises the following steps:
s1, obtaining the following design parameters according to design data provided by equipment manufacturers: the design values of the temperature of the coal gas at the inlet of the coal gas heater, the air temperature at the inlet of the air preheater and the water supply temperature are respectively set;
s2, obtaining the following actual measurement parameters according to the measuring instrument: the gas heater inlet gas temperature measured value, the gas heater outlet final exhaust gas temperature, the gas heater inlet smoke temperature, the air preheater inlet air temperature measured value, the air preheater inlet smoke temperature, the water supply temperature measured value and the economizer inlet smoke temperature;
s3, calculating a corrected first exhaust gas temperature by considering the deviation between the actual measured value of the inlet gas temperature of the gas heater and the designed value of the inlet gas temperature of the gas heater;
s4, calculating a corrected exhaust gas temperature II by considering the deviation of the actual measured value of the air preheater inlet air temperature and the designed value of the air preheater inlet air temperature;
s5, calculating a corrected exhaust gas temperature III by considering the deviation of the measured value of the water supply temperature and the designed value of the water supply temperature;
s6, calculating to obtain the total corrected exhaust gas temperature based on the following formula;
t pyδ ＝t δ1 +t δ2 +t δ3 -(n+2)×t mpy ；
wherein, t δ1 To correct the exhaust gas temperature one, t δ2 To correct the exhaust gas temperature two, t δ3 For correcting the exhaust gas temperature three, t mpy The final exhaust gas temperature t of the outlet of the gas heater is obtained by actual measurement pyδ The total corrected exhaust gas temperature; n is 0 or 1.
Further, when the primary gas heater is connected in series, the calculation process of the corrected exhaust gas temperature one, the corrected exhaust gas temperature two, the corrected exhaust gas temperature three and the total corrected exhaust gas temperature is as follows:
the calculation formula of the corrected exhaust gas temperature I in the step S3 is as follows:
Figure BDA0003852419200000041
in the formula, t mqd For the design value of the inlet gas temperature, t, of the gas heater mq Is the measured value of the inlet gas temperature t of the gas heater mjy Is the inlet smoke temperature t of the gas heater mpy The final exhaust gas temperature of the outlet of the gas heater is obtained through actual measurement;
the second corrected exhaust gas temperature in the step S4 is calculated by the following formula:
Figure BDA0003852419200000042
in the formula, t kjy For the inlet gas temperature t of the air preheater jfd For the design value of the inlet air temperature, t, of the air preheater jf The measured value of the air temperature at the inlet of the air preheater is obtained;
the third calculation formula of the corrected exhaust gas temperature in the step S5 is as follows:
Figure BDA0003852419200000043
in the formula, t sjy Is the inlet smoke temperature t of the economizer w For measured value of feed water temperature, t wd A design value for the feed water temperature;
calculating the total corrected exhaust gas temperature by using the obtained corrected exhaust gas temperature I, the corrected exhaust gas temperature II and the corrected exhaust gas temperature III:
t pyδ ＝t δ1 +t δ2 +t δ3 -(n+2)×t mpy ；
in the formula, n =0.
Further, when the two-stage gas heater is connected in series, the calculation processes of the corrected exhaust gas temperature one, the corrected exhaust gas temperature two, the corrected exhaust gas temperature three and the total corrected exhaust gas temperature are as follows:
in the step S3, the corrected exhaust gas temperature I is obtained by considering the deviation calculation between the actual measured value of the inlet gas temperature of the two-stage gas heater and the designed value of the inlet gas temperature of the gas heater;
Figure BDA0003852419200000051
Figure BDA0003852419200000052
in the formula, t δ11 The corrected exhaust gas temperature is calculated by considering the deviation between the actual measured value of the inlet gas temperature of the second-stage gas heater and the designed value of the inlet gas temperature of the second-stage gas heater; t is t δ12 The corrected exhaust gas temperature is calculated by considering the deviation between the actually measured value of the inlet gas temperature of the first-stage gas heater and the designed value of the inlet gas temperature of the first-stage gas heater;
t″ mqd is the design value of the temperature of the inlet gas of the second stage gas heater, t ″) mjy Is the inlet smoke temperature t of the second stage gas heater mpy The measured outlet smoke temperature t of the second stage gas heater mq Is the measured value of the inlet gas temperature of the second stage gas heater, t' mjy Is the inlet smoke temperature of the first stage gas heater of t' mqd Is a design value of inlet gas temperature of the primary gas heater, t' mq Is the measured value of the temperature of the inlet gas of the first stage gas heater, t jf The measured value of the air temperature at the inlet of the air preheater;
corrected exhaust gas temperature of t δ1 Comprises the following steps:
t δ1 ＝t δ11 +t δ12 ；
the second corrected exhaust gas temperature in the step S4 is calculated by the following formula:
Figure BDA0003852419200000053
in the formula, t kjy For the inlet gas temperature t of the air preheater jfd For air preheaterDesigning an inlet air temperature value;
the third calculation formula of the corrected exhaust gas temperature in the step S5 is as follows:
Figure BDA0003852419200000061
Figure BDA0003852419200000062
in the formula, t sjy Is the inlet smoke temperature t of the economizer w For measured value of feed water temperature, t wd A design value for the feed water temperature;
calculating the total corrected exhaust gas temperature by using the obtained corrected exhaust gas temperature I, the corrected exhaust gas temperature II and the corrected exhaust gas temperature III:
t pyδ ＝t δ1 +t δ2 +t δ3 -(n+2)×t mpy ；
wherein n =1,t mpy The final exhaust gas temperature of the outlet of the gas heater is obtained through actual measurement; t is t mpy ＝t″ mpy Namely the actual measurement of the outlet smoke temperature of the second stage gas heater.
The invention has the beneficial effects that:
the correction method can more accurately calculate and obtain the corrected outlet smoke temperature of the gas heater aiming at the condition that the inlet gas temperature of the gas heater, the inlet air temperature (inlet air) temperature of the air preheater and the feed water temperature at the inlet of the economizer deviate from the designed value or the guaranteed value, and can be used for correcting and calculating the smoke temperature of a gas boiler (such as a gas boiler comprising two stages of gas heaters) with gradient energy utilization.
The method for correcting the exhaust gas temperature has important significance for examining the exhaust gas temperature of the gas boiler and guiding the operation and optimization of the boiler.
Drawings
FIG. 1 is a schematic view showing the structure of a gas boiler system of the present invention connected in series with a primary gas heater.
FIG. 2 is a schematic view showing the structure of a gas boiler system of the present invention having two stages of gas heaters connected in series.
FIG. 3 is a flow chart of the method for correcting the exhaust gas temperature of a gas boiler connected with a gas heater in series according to 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.
The system as shown in figure 1 with a first stage gas heater connected in series; the system comprises an economizer, an air preheater and a gas heater which are arranged on a boiler flue; aiming at the system, the method for correcting the exhaust gas temperature of the gas boiler comprises the following steps:
s1, obtaining the following design parameters according to design data provided by equipment manufacturers: the design values of the temperature of the coal gas at the inlet of the coal gas heater, the air temperature at the inlet of the air preheater and the water supply temperature are respectively set;
s2, obtaining the following actual measurement parameters according to the measuring instrument: the measured value of the gas temperature at the inlet of the gas heater, the final exhaust gas temperature at the outlet of the gas heater, the measured value of the smoke temperature at the inlet of the gas heater, the measured value of the air temperature at the inlet of the air preheater, the measured value of the smoke temperature at the inlet of the air preheater, the measured value of the water supply temperature and the smoke temperature at the inlet of the economizer;
s3, considering the deviation between the measured value of the inlet gas temperature of the gas heater and the designed value of the inlet gas temperature of the gas heater, and calculating the corrected exhaust gas temperature t δ1 ；
Figure BDA0003852419200000071
In the formula, t mqd For the design value of the inlet gas temperature, t, of the gas heater mq Is the measured value of the inlet gas temperature t of the gas heater mjy Is the inlet smoke temperature t of the gas heater mpy The final exhaust gas temperature of the outlet of the gas heater is obtained through actual measurement;
s4, calculating the corrected exhaust gas temperature two t by considering the deviation of the actual measured value of the air preheater inlet air temperature and the designed value of the air preheater inlet air temperature δ2 ；
Figure BDA0003852419200000081
In the formula, t kjy For the inlet gas temperature t of the air preheater jfd For the design value of the inlet air temperature, t, of the air preheater jf The measured value of the air temperature at the inlet of the air preheater is obtained;
s5, calculating the corrected exhaust gas temperature three t by considering the deviation of the measured water supply temperature value and the designed water supply temperature value δ3 ；
Figure BDA0003852419200000082
In the formula, t sjy Is the inlet smoke temperature t of the economizer w For measured value of feed water temperature, t wd A design value for the feed water temperature;
s6, calculating the total corrected exhaust gas temperature t by using the corrected exhaust gas temperature I, the corrected exhaust gas temperature II and the corrected exhaust gas temperature III pyδ ：
t pyδ ＝t δ1 +t δ2 +t δ3 -2t mpy 。
A system with two stages of gas heaters in series as shown in figure 2; the system comprises an economizer, an air preheater, a first stage gas heater and a second stage gas heater which are arranged on a boiler flue; aiming at the system, the method for correcting the exhaust gas temperature of the gas boiler comprises the following steps:
s1, obtaining the following design parameters according to design data provided by equipment manufacturers: the design values of the inlet gas temperature of the gas heater, the inlet air temperature of the air preheater and the water supply temperature are respectively set;
s2, obtaining the following actual measurement parameters according to a measuring instrument: the gas heater inlet gas temperature measured value, the gas heater outlet final exhaust gas temperature, the gas heater inlet smoke temperature, the air preheater inlet air temperature measured value, the air preheater inlet smoke temperature, the water supply temperature measured value and the economizer inlet smoke temperature;
s3, considering the deviation between the measured value of the inlet gas temperature of the gas heater and the designed value of the inlet gas temperature of the gas heater, and calculating the corrected exhaust gas temperature t δ1 ；
The corrected exhaust gas temperature is t δ1 Calculating to obtain a deviation between an actually measured value of the inlet gas temperature of the two-stage gas heater and a designed value of the inlet gas temperature of the gas heater;
Figure BDA0003852419200000091
Figure BDA0003852419200000092
in the formula, t δ11 The corrected exhaust gas temperature is calculated by considering the deviation between the actual measured value of the inlet gas temperature of the second-stage gas heater and the designed value of the inlet gas temperature of the second-stage gas heater; t is t δ12 The corrected exhaust gas temperature is calculated by considering the deviation between the actually measured value of the inlet gas temperature of the first-stage gas heater and the designed value of the inlet gas temperature of the first-stage gas heater;
t″ mqd is the design value of the temperature of the inlet gas of the second stage gas heater, t ″) mjy Is the inlet smoke temperature t of the second stage gas heater mpy The measured outlet smoke temperature t of the second stage gas heater mq Is the measured value of the inlet gas temperature of the second stage gas heater, t' mjy Is the inlet smoke temperature of the first stage gas heater of t' mqd Is the design value of the inlet gas temperature of the first stage gas heater, t' mq Is the measured value of the temperature of the inlet gas of the first stage gas heater, t jf The measured value of the air temperature at the inlet of the air preheater is obtained;
corrected exhaust gas temperature of t δ1 Comprises the following steps:
t δ1 ＝t δ11 +t δ12 ；
s4, calculating the corrected exhaust gas temperature two t by considering the deviation of the actual measured value of the air preheater inlet air temperature and the designed value of the air preheater inlet air temperature δ2 ；
Figure BDA0003852419200000101
In the formula, t kjy For the inlet gas temperature t of the air preheater jfd The design value of the air temperature at the inlet of the air preheater is obtained;
s5, calculating the corrected exhaust gas temperature three t by considering the deviation of the measured water supply temperature value and the designed water supply temperature value δ3 ；
Figure BDA0003852419200000102
Figure BDA0003852419200000103
Of formula (II) to' δ Is an intermediate amount; t is t sjy Is the inlet smoke temperature t of the economizer w For measured value of feed water temperature, t wd A design value for the feed water temperature;
s6, calculating the total corrected exhaust gas temperature t by using the corrected exhaust gas temperature I, the corrected exhaust gas temperature II and the corrected exhaust gas temperature III pyδ ：
t pyδ ＝t δ1 +t δ2 +t δ3 -3t mpy ；
t mpy The final exhaust gas temperature of the outlet of the gas heater is obtained through actual measurement; t is t mpy ＝t″ mpy I.e. t mpy The measured outlet smoke temperature of the second stage coal gas heater is obtained.
Tables 1 and 2 are calculation tables for boiler flue gas temperature correction using the above correction method for the data of the embodiment of the system of fig. 1 and 2.
TABLE 1 correction and calculation table for smoke-discharging temperature of gas-fired boiler with one-stage gas heater connected in series
Figure BDA0003852419200000104
Figure BDA0003852419200000111
TABLE 2 correction and calculation table for smoke-discharging temperature of gas-fired boiler with two-stage gas heater connected in series
Figure BDA0003852419200000112
Figure BDA0003852419200000121
It is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and it is within the scope of the present invention to adopt various insubstantial modifications of the method concept and technical scheme of the present invention, or to directly apply the concept and technical scheme of the present invention to other occasions without modification.

Claims (3)

1. A method for correcting the exhaust gas temperature of a gas-fired boiler connected with a gas heater in series is characterized by comprising the following steps of:
s1, obtaining the following design parameters according to design data provided by equipment manufacturers: the design values of the temperature of the coal gas at the inlet of the coal gas heater, the air temperature at the inlet of the air preheater and the water supply temperature are respectively set;
s2, obtaining the following actual measurement parameters according to the measuring instrument: the gas heater inlet gas temperature measured value, the gas heater outlet final exhaust gas temperature, the gas heater inlet smoke temperature, the air preheater inlet air temperature measured value, the air preheater inlet smoke temperature, the water supply temperature measured value and the economizer inlet smoke temperature;
s3, calculating a corrected first exhaust gas temperature by considering the deviation between the actual measured value of the inlet gas temperature of the gas heater and the designed value of the inlet gas temperature of the gas heater;
s4, calculating a corrected exhaust gas temperature II by considering the deviation of the actual measured value of the air preheater inlet air temperature and the designed value of the air preheater inlet air temperature;
s5, calculating a corrected exhaust gas temperature III by considering the deviation of the measured water supply temperature value and the designed water supply temperature value;
s6, calculating to obtain the total corrected exhaust gas temperature based on the following formula;
t pyδ ＝t δ1 +t δ2 +t δ3 -(n+2)×t mpy ；
wherein, t δ1 To correct the exhaust gas temperature one, t δ2 To correct the exhaust gas temperature two, t δ3 For correcting the exhaust gas temperature three, t mpy The final exhaust gas temperature t of the outlet of the gas heater is obtained by actual measurement pyδ The total corrected exhaust gas temperature; n is 0 or 1.
2. The method for correcting the smoke exhaust temperature of the gas-fired boiler connected with the gas heater in series according to claim 1, wherein when the primary gas heater is connected in series, the calculation processes of the corrected smoke exhaust temperature I, the corrected smoke exhaust temperature II, the corrected smoke exhaust temperature III and the total corrected smoke exhaust temperature are as follows:
the calculation formula of the corrected exhaust gas temperature I in the step S3 is as follows:
Figure FDA0003852419190000021
in the formula, t mqd Is the design value of the inlet gas temperature, t, of the gas heater mq Is the measured value of the inlet gas temperature t of the gas heater mjy Is the inlet smoke temperature t of the gas heater mpy The final exhaust gas temperature of the outlet of the gas heater is obtained through actual measurement;
the second corrected exhaust gas temperature in the step S4 is calculated by the following formula:
Figure FDA0003852419190000022
in the formula, t kjy For the inlet gas temperature t of the air preheater jfd Is the design value of the inlet air temperature, t, of the air preheater jf The measured value of the air temperature at the inlet of the air preheater is obtained;
the third calculation formula of the corrected exhaust gas temperature in the step S5 is as follows:
Figure FDA0003852419190000023
in the formula, t sjy Is the inlet smoke temperature t of the economizer w Is the measured value of the feed water temperature, t wd A design value for the feed water temperature;
calculating the total corrected exhaust gas temperature by using the obtained corrected exhaust gas temperature I, the corrected exhaust gas temperature II and the corrected exhaust gas temperature III:
t pyδ ＝t δ1 +t δ2 +t δ3 -(n+2)×t mpy ；
in the formula, n =0.
3. The method for correcting the smoke exhaust temperature of the gas-fired boiler connected in series with the gas heater as claimed in claim 1, wherein when the two-stage gas heater is connected in series, the calculation processes of the corrected smoke exhaust temperature I, the corrected smoke exhaust temperature II, the corrected smoke exhaust temperature III and the total corrected smoke exhaust temperature are as follows:
in the step S3, the corrected exhaust gas temperature I is obtained by considering the deviation calculation between the actual measured value of the inlet gas temperature of the two-stage gas heater and the designed value of the inlet gas temperature of the gas heater;
Figure FDA0003852419190000031
Figure FDA0003852419190000032
in the formula, t δ11 Corrected exhaust gas temperature calculated by considering the deviation between the actual measured value of the inlet gas temperature of the second stage gas heater and the designed value of the inlet gas temperature of the second stage gas heater; t is t δ12 The corrected exhaust gas temperature is calculated by considering the deviation between the actually measured value of the inlet gas temperature of the first-stage gas heater and the designed value of the inlet gas temperature of the first-stage gas heater;
t″ mqd is the design value of the temperature of the inlet gas of the second stage gas heater, t ″) mjy Is the inlet smoke temperature, t ″, of the second stage gas heater mpy The measured outlet smoke temperature t of the second stage gas heater mq Is the measured value of the inlet gas temperature of the second stage gas heater, t' mjy Is the inlet smoke temperature t 'of the first stage gas heater' mq Is the measured value of the inlet gas temperature of the primary gas heater, t' mqd Is the designed value of the inlet gas temperature, t, of the first stage gas heater jf The measured value of the air temperature at the inlet of the air preheater;
corrected exhaust gas temperature t δ1 Comprises the following steps:
t δ1 ＝t δ11 +t δ12 ；
the second corrected exhaust gas temperature in the step S4 is calculated by the following formula:
Figure FDA0003852419190000033
in the formula, t kjy For the inlet gas temperature t of the air preheater jfd The design value of the air temperature at the inlet of the air preheater is obtained;
the third calculation formula of the corrected exhaust gas temperature in the step S5 is as follows:
Figure FDA0003852419190000041
Figure FDA0003852419190000042
in the formula, t sjy Is the inlet smoke temperature t of the economizer w For measured value of feed water temperature, t wd A design value for the feed water temperature;
calculating the total corrected exhaust gas temperature by using the obtained corrected exhaust gas temperature I, the corrected exhaust gas temperature II and the corrected exhaust gas temperature III:
t pyδ ＝t δ1 +t δ2 +t δ3 -(n+2)×t mpy ；
wherein n =1,t mpy The final exhaust gas temperature of the outlet of the gas heater is obtained through actual measurement; t is t mpy ＝t″ mpy And the measured exhaust gas temperature of the outlet of the second stage coal gas heater is obtained.
CN202211147658.6A 2022-09-19 2022-09-19 Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series Pending CN115470441A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211147658.6A CN115470441A (en) 2022-09-19 2022-09-19 Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211147658.6A CN115470441A (en) 2022-09-19 2022-09-19 Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series

Publications (1)

Publication Number Publication Date
CN115470441A true CN115470441A (en) 2022-12-13

Family

ID=84333695

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211147658.6A Pending CN115470441A (en) 2022-09-19 2022-09-19 Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series

Country Status (1)

Country Link
CN (1) CN115470441A (en)

Similar Documents

Publication Publication Date Title
JP4712048B2 (en) Operation method for maximum efficiency of non-condensing boiler
CN110223007B (en) Calculation method for air leakage rate of boiler furnace
CN110162918B (en) Method and system for acquiring efficiency of once-through boiler of blast furnace gas unit
CN101182957A (en) Air gas primary heater unit of hot-air stove
CN108826989B (en) Radiant tube combustion performance thermal simulation test furnace and method
CN110298502A (en) Based on the boiler optimum oxygen calculation method that efficiency is optimal
CN109780529A (en) A kind of biomass cogeneration of heat and power operation method mixing water heat supply based on end electric heating pump
CN115470441A (en) Method for correcting exhaust gas temperature of gas-fired boiler connected with gas heater in series
CN209388199U (en) A kind of gas fired radiant tubes temperature control system
CN112664922B (en) Method for correcting exhaust gas temperature of boiler with air preheater bypass economizer
WO2022088687A1 (en) Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler
CN116432453A (en) Method for correcting exhaust gas temperature of gas boiler with cross-arranged gas heaters
CN206131023U (en) Stable control gas boiler coal air preheater low temperature corrosion's device
CN104504290B (en) Exhaust smoke temperature correction method of blast furnace gas-fired boiler
CN210773495U (en) Smoke discharging and heat exchanging system of trolley type annealing furnace
CN109580711B (en) Soft measurement method for gas calorific value under condition of blast furnace gas and converter gas co-combustion
CN109632881B (en) Metallurgical gas calorific value soft measurement method based on gas preheating system heat exchange parameters
CN209271100U (en) A kind of carbon black tail gas dehydration device
CN112432491A (en) Method and device for humidifying and increasing temperature of combustion-supporting air of hot blast stove
CN115451420A (en) Exhaust gas temperature correction method for boiler tail flue parallel system
CN217816855U (en) Air supply system capable of effectively inhibiting low-temperature corrosion of pipe wall of final-stage air preheater
CN103148502B (en) Method for alleviating corrosion of boiler preheater
CN214469354U (en) High-power full convection type condensation low-nitrogen boiler system
CN115597368B (en) Method and device for producing cyanuric acid by heating tunnel type urea cracking furnace based on natural gas hot blast stove
CN110287642B (en) Method for adjusting air coefficient of ceramic kiln

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