CN111121084A - Boiler is mixed and is burnt inferior coal anti-coking operating system - Google Patents
Boiler is mixed and is burnt inferior coal anti-coking operating system Download PDFInfo
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- CN111121084A CN111121084A CN201911280428.5A CN201911280428A CN111121084A CN 111121084 A CN111121084 A CN 111121084A CN 201911280428 A CN201911280428 A CN 201911280428A CN 111121084 A CN111121084 A CN 111121084A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The invention relates to a boiler doped inferior coal anti-coking operation system, which comprises: the system is used for measuring the flue gas temperature of a plurality of temperature measuring points of the bottom hearth section of the platen superheater in real time; the data acquisition and remote transmission system is used for averaging the flue gas temperatures of the plurality of temperature measuring points to obtain the average flue gas temperature of the bottom hearth section of the platen superheater; the system comprises a poor-quality coal blending proportion calculation system, a screen superheater and a control system, wherein the poor-quality coal blending proportion calculation system is used for acquiring the average flue gas temperature at the bottom of the screen superheater and calculating the maximum blending poor-quality coal proportion according to the relation between ash components and ash melting points and the mass conservation law relation of the ash components of the blended coal; wherein the ash melting point softening temperature is equal to the average flue gas temperature at the bottom of the platen superheater. The method can give the maximum blending proportion of the inferior coal under the condition of controlling the bottom of the boiler platen superheater not to generate serious coking, achieves the prevention effect of coking at the bottom of the boiler blending inferior coal platen superheater of the thermal power plant, and simultaneously enables the economy of blending inferior coal of the thermal power plant to be maximized.
Description
Technical Field
The invention belongs to the technical field of safe operation of thermal power plants, and particularly relates to an anti-coking operation system for a boiler doped with burning inferior coal.
Background
In recent years, in order to save fuel cost, a plurality of power plants in China burn a large amount of low-quality coal, particularly high-sulfur and high-alkali coal, so that the coking phenomenon of a boiler is aggravated, wherein coke hanging at the bottom of a screen superheater is a common problem in the operation of the boiler, and serious coking has adverse effects on the safety and the economical efficiency of the operation of the boiler. The coking of the hearth can cause the rise of the smoke temperature, the superheated steam temperature and the exhaust gas temperature at the outlet of the hearth, and can cause the overheating and the overtemperature of the pipe walls of a superheater and a reheater when the temperature is serious, thereby damaging the safety of a heating surface; meanwhile, due to uneven distribution of coking in the hearth, the problems of increased smoke temperature deviation at the outlet of the hearth, increased thermal deviation of superheated steam and the like can be caused; the coke block on the upper part of the hearth falls off, so that the combustion stability is influenced, the negative pressure of the hearth fluctuates greatly, and even safety accidents such as water wall breaking, hearth fire extinguishing and the like are caused. Therefore, an anti-coking operation scheme for the doped poor-quality coal is needed.
Disclosure of Invention
The invention aims to provide an anti-coking operation system for boiler doped poor-quality coal, which is used for monitoring the temperature condition of flue gas in real time aiming at a specific coking area in a hearth, and simultaneously combining data analysis of coal used for boiler combustion to give the maximum proportion of the doped poor-quality coal so as to guide operators to adjust the coal feeding and ensure the safety and the economical efficiency of boiler operation.
The invention provides a boiler anti-coking operation system doped with inferior coal, which comprises:
the system is used for measuring the flue gas temperature of a plurality of temperature measuring points of the bottom hearth section of the platen superheater in real time;
the data acquisition and remote transmission system is used for averaging the flue gas temperatures of the plurality of temperature measuring points to obtain the average flue gas temperature of the bottom hearth section of the platen superheater;
the system comprises an inferior coal blending proportion calculation system, a screen superheater, a control system and a control system, wherein the inferior coal blending proportion calculation system is used for acquiring the average flue gas temperature of the bottom hearth section of the screen superheater and calculating the maximum blending inferior coal proportion according to the relation between ash components and ash melting points and the mass conservation law relation of the ash components of the blended coal; and the ash melting point softening temperature is equal to the average flue gas temperature of the section of the hearth at the bottom of the platen superheater.
Furthermore, the system for measuring the flue gas temperature of the bottom hearth section of the screen superheater comprises six infrared temperature measuring probes which are respectively installed on a hearth front wall, a hearth left wall and a hearth right wall corresponding to the bottom section of the screen superheater, and two infrared temperature measuring probes are respectively installed on each side wall surface.
Further, the flue gas temperature measured in real time by the flue gas temperature measuring system of the hearth section at the bottom of the platen superheater is sent to the data acquisition and remote transmission system at the frequency of once per 10 seconds, and the data acquisition and remote transmission system transmits the average flue gas temperature to the poor-quality coal blending ratio calculation system at the frequency of once per minute.
By means of the scheme, the boiler is doped with the inferior coal and is prevented from coking the operation system, the maximum doped burning proportion of the inferior coal can be given under the condition that the bottom of the boiler screen type superheater is controlled from being seriously coked, and the economical maximization of the thermal power plant doped with the inferior coal is achieved while the prevention effect of coking at the bottom of the thermal power plant boiler doped with the inferior coal screen type superheater is achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an anti-coking operation system for a boiler doped with poor-quality coal according to the present invention;
FIG. 2 is a schematic view of the installation of the flue gas temperature measuring system of the bottom furnace section of the heater of the present invention;
FIG. 3 is a flow chart of the calculation system for the blending ratio of low-grade coal according to the present invention.
Reference numbers in the figures:
1-a flue gas temperature measuring system for a hearth section at the bottom of a platen superheater; 2-a data acquisition and remote transmission system; 3-a system for calculating the blending ratio of the inferior coal; 4-infrared temperature measuring probe; 5-furnace rear wall; 6-left wall of hearth; 7-furnace front wall; 8-furnace right wall.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The embodiment provides a boiler mixes burning inferior quality coal anti-coking operating system, includes:
the system comprises a screen superheater bottom hearth section flue gas temperature measuring system 1, a screen superheater bottom hearth section flue gas temperature measuring system and a control system, wherein the screen superheater bottom hearth section flue gas temperature measuring system is used for measuring the flue gas temperature of a plurality of temperature measuring points of the screen superheater bottom hearth section in real time;
the data acquisition and remote transmission system 2 is used for averaging the flue gas temperatures of the plurality of temperature measuring points to obtain the average flue gas temperature of the bottom hearth section of the platen superheater;
the inferior coal blending proportion calculation system 3 is used for obtaining the average flue gas temperature of the bottom hearth section of the platen superheater and calculating the maximum proportion of the blended inferior coal according to the relation between ash components and ash melting points and the mass conservation law relation of the ash components of the blended coal; and the ash melting point softening temperature is equal to the average flue gas temperature of the section of the hearth at the bottom of the platen superheater.
Through the anti-coking operation system for the boiler doped with the inferior coal, the maximum doped burning proportion of the inferior coal can be given under the condition that the bottom of the boiler platen superheater is controlled not to be seriously coked, so that the economical maximization of the thermal power plant doped with the inferior coal is realized while the prevention effect of coking at the bottom of the thermal power plant boiler doped with the inferior coal platen superheater is achieved.
In this real-time example, the flue gas temperature measurement system 1 for the bottom furnace section of the platen superheater includes six infrared temperature measurement probes 4, which are respectively installed on a furnace front wall 7, a furnace left wall 6 and a furnace right wall 8 corresponding to the bottom section of the platen superheater, and two infrared temperature measurement probes 4 are respectively installed on each side wall surface.
In this embodiment, the flue gas temperature measured in real time by the flue gas temperature measuring system 1 for the bottom furnace section of the platen superheater is sent to the data acquisition and remote transmission system 2 at a frequency of once per 10 seconds, and the data acquisition and remote transmission system 2 sends the average flue gas temperature to the low-grade coal blending ratio calculation system 3 at a frequency of once per minute.
Referring to fig. 3, the calculation flow of the system for calculating the blending ratio of the low-grade coal is as follows:
the mixed coal C for boiler combustion contains the mixed burning inferior coal A in a proportion of x% and the main coal B in a proportion of (100-x)%. The ash compositions of the two coals are assumed to be as shown in the following table:
| coal kind | SiO2(％) | Al2O3(％) | Fe2O3(％) | CaO(％) | MgO(％) |
| A | a1 | a2 | a3 | a4 | a5 |
| B | b1 | b2 | b3 | b4 | b5 |
The ash component of the single coal can be obtained by testing, and the ash component of the mixed coal can be calculated according to the relation of mass conservation. Such as SiO in the coal mixture2The content of (%) (x%. a)1+(100-x)％·b1) The other components can be obtained in the same way.
Given a load, given two coal calorific values, given an ash composition analysis of the two coals, given a minimum coal blend ash melting point softening temperature ST, this temperature is assumed to be equivalent to the actually measured average temperature of the platen superheater floor (T;)Temperature of smoke at bottom of screen) The flue gas temperature of the bottom hearth section of the screen superheater is measured by a flue gas temperature measuring system and is transmitted out by a data acquisition and remote transmission system, so that the maximum proportion of the mixed combustion of the low-grade coal in the main coal is reversely deduced. The relationship between the ST and the ash components involved therein uses a domestic general calculation formula.
When SiO is present2Content of not more than 60%, and A12O3The content is more than 30 percent, and the temperature of the melting point of the coal ash can be pressed downCalculating the formula:
ST＝69.94·SiO2+71.01·Al2O3+65.23·Fe2O3+12.16·CaO+68.31·MgO+67.19·a-5484.7 (1)
when SiO is present2Content not more than 60%, A12O3Not more than 30% and Fe2O3When the content of (b) is not more than 15%, the temperature of the melting point of the coal ash can be calculated according to the following formula:
ST＝92.55·SiO2+97.83·Al2O3+84.52·Fe2O3+83.67·CaO+81.04·MgO+91.92·a-7891 (2)
when SiO is present2Content greater than 60%, A12O3Not more than 30% and Fe2O3When the content of (b) is more than 15%, the melting point temperature of the coal ash can be calculated according to the following formula:
ST＝1531-3.01·SiO2+5.08·Al2O3-8.02·Fe2O3-9.69·CaO-5.86·MgO-3.99·a(3)
when SiO is present2When the content is more than 60%, the temperature of the melting point of the coal ash can be calculated according to the following formula:
ST＝10.75·SiO2+13.03·Al2O3-5.28·Fe2O3-5.88·CaO-10.28·MgO+3.75·a+453 (4)
wherein, a is 100- (SiO)2+Al2O3+Fe2O3+CaO+MgO)
Assuming that raw coal 1 is co-fired in raw coal 2, the average smoke temperature T of the screen bottom measured by the system for measuring the smoke temperature of the bottom hearth section of the screen superheater is measuredTemperature of smoke at bottom of screen＝1182℃。
The main ash components of the two coals are as follows:
| coal kind | SiO2(％) | Al2O3(％) | Fe2O3(％) | CaO(％) | MgO(％) |
| |
49.09 | 16.59 | 11.11 | 7.58 | 1.9 |
| |
42.06 | 46.24 | 3.01 | 1.59 | 0.17 |
According to the calculation process, when the coking of the platen superheater is avoided, the maximum proportion of the co-fired raw coal 1 in the raw coal 2 is calculated to be 27%.
The invention has good spontaneity, high efficiency and environmental protection, can be used for monitoring and controlling the coking of the boiler platen superheater, is beneficial to preventing the bottom of the boiler platen superheater from generating serious coking, and ensures the safe operation of a thermal power plant.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The utility model provides a boiler mixes burning inferior coal anti-coking operating system which characterized in that includes:
the system is used for measuring the flue gas temperature of a plurality of temperature measuring points of the bottom hearth section of the platen superheater in real time;
the data acquisition and remote transmission system is used for averaging the flue gas temperatures of the plurality of temperature measuring points to obtain the average flue gas temperature of the bottom hearth section of the platen superheater;
the system comprises an inferior coal blending proportion calculation system, a screen superheater, a control system and a control system, wherein the inferior coal blending proportion calculation system is used for acquiring the average flue gas temperature of the bottom hearth section of the screen superheater and calculating the maximum blending inferior coal proportion according to the relation between ash components and ash melting points and the mass conservation law relation of the ash components of the blended coal; and the ash melting point softening temperature is equal to the average flue gas temperature of the section of the hearth at the bottom of the platen superheater.
2. The boiler doped poor coal anti-coking operation system according to claim 1, wherein the flue gas temperature measurement system for the bottom furnace section of the platen superheater comprises six infrared temperature measurement probes which are respectively installed on a front furnace wall, a left furnace wall and a right furnace wall corresponding to the bottom section of the platen superheater, and two infrared temperature measurement probes are respectively installed on each side wall surface.
3. The boiler blending burning poor-quality coal anti-coking operation system according to claim 2, wherein the flue gas temperature measured in real time by the flue gas temperature measuring system of the bottom hearth section of the platen superheater is sent to the data acquisition and remote transmission system at a frequency of once per 10 seconds, and the data acquisition and remote transmission system sends the average flue gas temperature to the poor-quality coal blending burning proportion calculation system at a frequency of once per minute.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113816A (en) * | 2006-07-27 | 2008-01-30 | 中国科学院工程热物理研究所 | Biomass circulating fluid bed burning method and biomass circulating fluid bed boiler |
| CN101639215A (en) * | 2008-08-01 | 2010-02-03 | 中国神华能源股份有限公司 | Method for reducing slag formation at platen zone of coal burning boiler |
| CN103216812A (en) * | 2013-04-15 | 2013-07-24 | 王衡 | Method for on-line monitoring and alarming of convection heating face flue gas temperature field of power station boiler |
| CN103791515A (en) * | 2014-02-19 | 2014-05-14 | 上海交通大学 | Hearth outlet smoke temperature on-line soft-measurement system of coal-fired boiler |
| CN106355359A (en) * | 2016-10-25 | 2017-01-25 | 新疆华电喀什热电有限责任公司 | Fuel management method and device |
| CN108716664A (en) * | 2018-04-28 | 2018-10-30 | 国网山东省电力公司电力科学研究院 | A kind of method and apparatus of on-line measurement burner hearth ash fouling coefficient |
-
2019
- 2019-12-13 CN CN201911280428.5A patent/CN111121084A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101113816A (en) * | 2006-07-27 | 2008-01-30 | 中国科学院工程热物理研究所 | Biomass circulating fluid bed burning method and biomass circulating fluid bed boiler |
| CN101639215A (en) * | 2008-08-01 | 2010-02-03 | 中国神华能源股份有限公司 | Method for reducing slag formation at platen zone of coal burning boiler |
| CN103216812A (en) * | 2013-04-15 | 2013-07-24 | 王衡 | Method for on-line monitoring and alarming of convection heating face flue gas temperature field of power station boiler |
| CN103791515A (en) * | 2014-02-19 | 2014-05-14 | 上海交通大学 | Hearth outlet smoke temperature on-line soft-measurement system of coal-fired boiler |
| CN106355359A (en) * | 2016-10-25 | 2017-01-25 | 新疆华电喀什热电有限责任公司 | Fuel management method and device |
| CN108716664A (en) * | 2018-04-28 | 2018-10-30 | 国网山东省电力公司电力科学研究院 | A kind of method and apparatus of on-line measurement burner hearth ash fouling coefficient |
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