CN213181340U - System for detecting biomass heat share in coal-fired coupled biomass combustion - Google Patents
System for detecting biomass heat share in coal-fired coupled biomass combustion Download PDFInfo
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Abstract
The utility model discloses a detect system of biomass heat share in burning of coal-fired coupling living beings, the system includes boiler, coal-fired burner, biomass burner and detection device, coal-fired burner is established and is used for burning coal in the boiler, biomass burner establishes in the boiler and is located coal-fired burner top, be used for burning biomass, detection device establishes when the boiler afterbody is used for detecting only burning coal, oxygen and carbon dioxide content in the boiler afterbody flue gas when only burning biomass and coupling burning coal and living beings when only burning, reach the carbon dioxide content based on standard oxygen content under the three kinds of circumstances respectively, the heat share R of the living beings of input boiler when carbon-fired and living beings coupling burning is calculated based on standard oxygen content's carbon dioxide content under the three kinds of circumstances. The system of the utility model has a relatively simple structure, and can relatively accurately obtain the biomass heat share in the combustion of the coal-fired coupled biomass.
Description
Technical Field
The utility model relates to an energy utilization technical field specifically relates to a system for biomass heat share in detecting coal-fired coupling biomass burning.
Background
Drastic changes in global climate and CO2The increasing emission of the fuel brings much pressure to the future survival of human beings, and the reduction of the consumption of fossil fuel can reduce CO2The greenhouse effect is reduced. The energy efficiency of thermal power generation is improved, the usage amount of biomass fuel is increased, and the coal consumption of a coal-fired power plant can be reduced, so that biomass and coal are subjected to coupled combustion, and power generation by using the existing coal-fired boiler and thermal power generation equipment is a shortcut for solving the problems.
Biomass and coal coupled power generation has two forms: direct mixed combustion and gasification combustion. For a direct mixed combustion power generation boiler, because the characteristic difference of biomass fuel is large, particularly the moisture, ash and fuel heat value are easily interfered by objective or subjective factors, the biomass fuel quantity and input heat entering the boiler cannot be measured by using a direct metering method, the biomass power generation share in a coupling generator set cannot be visually distinguished, and government departments and power grid companies are difficult to carry out electricity price subsidy on coupling power generation projects, so that the direct mixed combustion coupling power generation mode cannot be effectively popularized and applied.
SUMMERY OF THE UTILITY MODEL
The present application is based on the discovery and recognition by the inventors of the following facts and problems:
in the related technology, when direct mixed combustion is carried out, two methods are generally used for calculating the biomass heat share and the generated energy, wherein the first method is that biomass fuel is gasified in a gasification furnace, generated combustible reaction gas is sent into a hearth of a coal-fired boiler for combustion, the biomass heat share sent into the boiler by coupled combustion is obtained by measuring the flow and the heat value of the reaction gas, and the generated energy of the biomass is calculated; the second method is to analyze the smoke components in the boiler tail flue and detect CO2The content of the C14 in the gas is deduced to calculate the content of the biomass fed into the boiler, the C14 only exists in the biomass fuel and has very low content, while the fossil fuel such as fuel oil and fire coal basically does not contain C14, and the quality of the biomass fed into the boiler is indirectly calculated by measuring the content of the C14.
However, the inventor of the present invention found through research that, in the first method, the biomass is fed into a gasification boiler to be gasified by combustion, so as to obtain a reaction gas, and during the gasification process, viscous components such as tar are easily separated out, which causes technical obstacles and great inconvenience to the subsequent gas transportation and metering. In addition, parameters such as temperature, pressure and the like need to be controlled in the gasification furnace, the size and components of biomass entering the boiler need to be strictly controlled, the burning rate is not high when slag is discharged, and bottom slag is not subjected to high temperature action and is difficult to further comprehensively utilize.
Because the gasification efficiency of biomass in the gasification process is not high, the heat of biomass fuel is attenuated and lost before entering a coal-fired boiler, the net biomass power generation efficiency of the coupled power generation mode is low, the power generation economy is affected, and the gasification furnace equipment and the system are very complex and have high investment, so that the flexible adjustment and the adaptation to different biomasses are difficult to realize.
For the second method, the natural C14 contains certain radioactivity and has a long half-life, and the natural biomass contains a certain amount of C14, so that when coupled combustion is used for power generation, the coal product hardly contains C14, and the content of biomass entering the furnace is indirectly calculated by detecting trace concentration of C14, so that the real quality of biomass entering the furnace cannot be intuitively reflected, and the content of C14 in different biomasses is different, so that the method for indirectly calculating the biomass input quantity by using C14 is not accurate.
At present, adopt C14 detection technology, need regularly take a sample to the flue gas of the afterbody flue of boiler to send laboratory chemical examination, need longer cycle, it is unrealistic enough to change the unit that the running style is changeable to living beings mixing proportion. The method for detecting by using C14 has high cost, and cannot be popularized and applied to a coal-fired coupled biomass power plant because the detection cannot be carried out in real time at present.
The present invention aims at solving at least one of the technical problems in the related art to a certain extent.
Therefore, the utility model provides a detect system of thermal share of living beings in burning of coal-fired coupling living beings, this system architecture is simple relatively, convenient operation, and the thermal share accuracy of living beings that obtains is high.
According to the utility model discloses a system for biomass heat share in detection coal-fired coupling biomass burning includes:
a boiler;
the coal-fired burner is arranged in the boiler and used for burning coal;
the biomass burner is arranged in the boiler, positioned above the coal-fired burner and used for burning biomass;
the detection device is arranged at the tail of the boiler and is used for detecting the oxygen content and the carbon dioxide content in the tail flue gas of the boiler when only the coal is combusted, only the biomass is combusted and the coal and the biomass are combusted in a coupling way,
the oxygen content and carbon dioxide content of the flue gas measured when only the coal was burned in the boiler were VO, respectively21 and VCO21, the oxygen content and the carbon dioxide content of the flue gas detected when only biomass is burned in the boiler are VO, respectively22 and VCO 22, detection during coupled combustion of coal and biomass in a boilerThe oxygen content and the carbon dioxide content in the obtained flue gas are respectively VO 23 and VCO 23，
According to VO21 and VCO21 obtaining carbon dioxide content VCO based on standard oxygen in flue gas when burning only coal in boiler21s, according to VO 22 and VCO 22 obtaining the carbon dioxide content VCO based on the standard oxygen amount in the flue gas when only biomass is combusted in the boiler22s, according to VO 23 and VCO 23 obtaining the carbon dioxide content VCO based on the standard oxygen amount in the flue gas when simultaneously burning the fire coal and the biomass in the boiler23s，
The heat share R of biomass input into a boiler during coupled combustion of coal and biomass is obtained according to the following formula (1):
according to the utility model discloses a system for biomass heat share in detection coal-fired coupling biomass burning, set up detection device at the boiler afterbody, can detect only when burning coal, when only burning biomass and oxygen content and carbon dioxide content in the boiler afterbody flue gas when coupling burning coal and living beings, thereby be convenient for utilize formula (1) to calculate the biomass heat proportion of input boiler in the burning of coal-fired coupling biomass, the measurement and the statistics of coupling generating set biomass generated energy have been realized, the system architecture is simple relatively, and the operation of being convenient for, and the biomass heat's share accuracy that obtains is high.
In some embodiments, the detection device comprises a first detection device and a second detection device, the first detection device is used for detecting the oxygen content in the flue gas at the tail of the boiler, and the second detection device is used for detecting the carbon dioxide content in the flue gas at the tail of the boiler.
In some embodiments, the first detection device is used for detecting the oxygen volume concentration in the dry basis state of the flue gas at the tail of the boiler, and the second detection device is used for detecting the carbon dioxide volume concentration in the dry basis state of the flue gas at the tail of the boiler, so that the oxygen volume concentration in the dry basis state of the flue gas at the tail of the boiler can be detectedThe detected VO21、VCO21、VO 22、VCO 22、VO 23 and VCO 23 are volume concentrations in the dry state.
In some embodiments, the standard oxygen amount is 6% oxygen amount, wherein the VCO is obtained from the following equations (2), (3) and (4)21s、VCO22s and VCO23s：
In some embodiments, the system for detecting biomass heat share in coal-fired coupled biomass combustion further comprises: the coal pulverizing device is positioned outside the boiler and connected with the coal-fired burner and is used for crushing and pulverizing the coal and supplying the coal into the coal-fired burner; the first analysis and measurement device is positioned outside the boiler, is connected with the coal pulverizing device and the coal-fired burner, and is used for detecting coal quality components, lower heating value LHV1 and mass flow m1 of the coal-fired entering the boiler; the biomass pulverizing device is positioned outside the boiler and is connected with the biomass burner, and is used for crushing and pulverizing biomass and supplying the biomass into the biomass burner; and the second analytical metering device is positioned outside the boiler, is connected with the biomass pulverizing device and the biomass burner, and is used for detecting biomass components, a lower calorific value LHV2 and a mass flow m2 entering the boiler.
In some embodiments, when coupled burning of the coal and the biomass in the boiler, the first analytical metering device detects the lower heating value LHV1 and the mass flow rate m1 of the coal entering the boiler, the second analytical metering device detects the lower heating value LHV2 and the mass flow rate m2 of the biomass entering the boiler,
obtaining the heat share R of biomass input into a boiler during coupled combustion of coal and biomass according to the following formula (5)0：
Comparing R and R0It is verified whether the error of R obtained by equation (1) meets operational and metering requirements.
In some embodiments, the biomass is a reference biomass having a lower heating value of LHV2b and moisture and ash of Mar2b and Aar2b, respectively;
the moisture and ash of the incoming biomass entering the boiler, when the composition of the incoming biomass deviates from the composition of the reference biomass, are Mar2 and Aar2 respectively,
the lower calorific value of the biomass charged into the furnace is LHV2, and
in some embodiments, the system for detecting biomass heat share in coal-fired coupled biomass combustion further comprises an over-fire air nozzle disposed within the boiler and above the biomass burner.
Drawings
Fig. 1 is a flow chart of a method of detecting biomass heat share in coal-fired coupled biomass combustion according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a system for detecting biomass heat share in coal-fired coupled biomass combustion according to an embodiment of the invention.
Reference numerals:
boiler 1, coal-fired burner 2, biomass burner 3, detection device 4, first detection device 41, second detection device 42, coal-fired powder process device 5, first analytical metering device 6, biomass powder process device 7, second analytical metering device 8, overfire air nozzle 9, economizer 10, SCR denitrification facility 11, air preheater 12.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, a method for detecting biomass heat share in coal-fired coupled biomass combustion according to an embodiment of the present invention includes the following steps:
burning only the fire coal in the boiler, and measuring the oxygen content and the carbon dioxide content in the flue gas at the tail of the boiler respectively, and recording as VO21 and VCO21；
Only biomass is burned in the boiler, and the oxygen content and carbon dioxide content in the flue gas are measured at the tail of the boiler and recorded as VO respectively22 and VCO 22；
Coupling combustion of coal and biomass in a boiler, and measuring the oxygen content and carbon dioxide content in flue gas at the tail of the boiler, which are respectively recorded as VO 23 and VCO 23；
According to VO21 and VCO21 obtaining the carbon dioxide content based on standard oxygen amount in the flue gas when only burning coal in the boiler, and recording as VCO21s；
According to VO 22 and VCO22 obtaining the content of carbon dioxide based on standard oxygen amount in the flue gas when only biomass is combusted in the boiler, and recording as VCO22s；
According to VO23 and VCO23 obtaining the content of carbon dioxide based on standard oxygen amount in the flue gas when the coal and the biomass are simultaneously combusted in the boiler, and recording the content as VCO23s；
The heat share R of biomass input into a boiler during coupled combustion of coal and biomass is obtained according to the following formula (1):
according to the utility model discloses a method for detecting biomass heat share in burning of coal-fired coupling living beings, through detect respectively only when burning coal, only when burning living beings and oxygen content and carbon dioxide content in the boiler afterbody flue gas when coupling burning coal and living beings to utilize formula (1) to calculate the biomass heat proportion of input boiler in the burning of coal-fired coupling living beings, realized the measurement and the statistics of coupling generating set biomass generated energy, the method is simple relatively, and the thermal share accuracy of biomass that obtains is high moreover.
In some embodiments, the standard oxygen is 6% oxygen, and the VCO is obtained from equations (2), (3), and (4) below21s、VCO22s and VCO23s：
Thus, when the standard oxygen amount is set to 6% oxygen amount, the carbon dioxide content VCO based on the standard oxygen amount in the flue gas when only the coal is burned in the boiler can be obtained by the above three formulas, respectively21s, carbon dioxide content VCO based on standard oxygen amount in flue gas when only biomass is combusted in boiler22s and standard oxygen based carbon dioxide content VCO in flue gas during coupled combustion of coal and biomass23s。
In some embodiments, VO21、VCO21、VO 22、VCO 22、VO 23 and VCO 23 are volume concentrations in the dry state. Thus, the VCO21s、VCO22s and VCO23s are the volume concentrations in the dry state based on the standard oxygen amounts. Wherein the VCO obtained by the formula (2) is adjusted to a standard oxygen content of 6% oxygen21s is the carbon dioxide content in the flue gas on a dry basis based on 6% oxygen content when only coal is burned in the boiler, VCO derived from equation (3)22s is the carbon dioxide content in the flue gas based on 6% oxygen and in the dry state when only biomass is combusted in the boiler, VCO derived from equation (4)23s is the carbon dioxide content in the flue gas based on 6% oxygen and in a dry basis when the coal and biomass are combusted in a coupled manner in the boiler.
In some embodiments, during the step of coupled combustion of the coal and biomass in the boiler, the lower heating value and mass flow of the coal are detected, as LHV1 and m1, respectively; detecting the lower calorific value and the mass flow of the biomass, and respectively recording as LHV2 and m 2;
obtaining the heat share R of biomass input into a boiler during coupled combustion of coal and biomass according to the following formula (5)0：
Comparing R and R0Checking the error of R obtained by the formula (1)Whether the difference meets operational and metering requirements.
In other words, in this example, when only the coal is burned in the boiler, the oxygen content VO in the flue gas is measured separately only at the boiler tail21 and carbon dioxide content VCO21；
When only biomass is burned in the boiler, the oxygen content VO in the flue gas is measured separately only at the boiler tail 22 and carbon dioxide content VCO 22；
When the fire coal and the biomass are combusted in a coupled mode in the boiler, on one hand, the lower calorific value LHV1 and the mass flow m1 of the fire coal and the lower calorific value LHV2 and the mass flow m2 of the biomass are detected, and on the other hand, the oxygen content VO in the flue gas is respectively measured at the tail of the boiler 23 and carbon dioxide content VCO 23；
Finally, the heat share R of the biomass input into the boiler during the coupled combustion of the coal and the biomass is calculated by formula (1) on the one hand, and the heat share R of the biomass input into the boiler during the coupled combustion of the coal and the biomass is calculated by formula (5) on the other hand0By comparing R and R0The error of R obtained from equation (1) is determined and verified to meet operational and metering requirements.
In some embodiments, in the step of combusting only the biomass in the boiler, the detected biomass is a reference biomass, the lower heating value of the reference biomass is LHV2b, and the moisture and ash of the reference biomass are Mar2b and Aar2b, respectively;
when the composition of the charged biomass entering the boiler deviates from that of the reference biomass, the moisture and ash content of the charged biomass are Mar2 and Aar2, respectively, the lower calorific value of the charged biomass is LHV2, and
in this embodiment, the inventor of the present invention found through research that biomass fuel has variability, and external moisture and ash (ash, inorganic matter, residue after calcination or after drying) are easy to fluctuate, which causes great changes in the lower calorific value and mass flow rate of biomass entering the boiler. In other words, the biomass entering the boiler is changed along with the moisture and ash contained in the biomass, so that the lower calorific value of the biomass is correspondingly changed. It is therefore difficult to meter and analyze the biomass input energy share in coupled power generation. For this reason, a reference biomass is set as a calculation reference to improve accuracy. The reference biomass is a biomass fuel of a certain type, the carbon-hydrogen ratio in the fuel element analysis is relatively fixed, and the moisture, ash and lower calorific value of the fuel are fixed values.
Because the medium moisture and the ash content of the biomass fuel do not generate heat during combustion, the heat mainly comes from carbon and hydrogen elements, once the moisture and the ash content in the reference biomass fuel deviate, the low-order heat value of the biomass fuel can be corrected through a formula (6), meanwhile, when the biomass fuel is combusted in a hearth, the moisture and the ash content deviating from the reference biomass components do not influence the components of dry-based flue gas, and CO in the dry-based flue gas2The volume concentration depends only on the type of biomass fuel, i.e. the hydrocarbon ratio.
The system for detecting biomass heat share in coal-fired coupled biomass combustion according to the embodiment of the present invention is described below with reference to the accompanying drawings, and comprises a boiler 1, a coal-fired burner 2, a biomass burner 3 and a detection device 4.
A coal-fired burner 2 is provided in the boiler 1 for burning coal. A biomass burner 3 is provided in the boiler 1 for combusting biomass, and the biomass burner 3 is located above the coal-fired burner 2. The coal-fired burner 2 and the biomass burner 3 are spaced at a certain distance in the vertical direction, and when the biomass is combusted by coupling the coal-fired burner with the biomass, the staged combustion in the boiler is realized, and NO is realizedXReduction control of (3) reduction of NOXAnd (5) discharging.
The detection device 4 is arranged at the tail of the boiler and used for detecting the oxygen content and the carbon dioxide content in the flue gas at the tail of the boiler when only the fire coal is combusted, only the biomass is combusted and the fire coal and the biomass are combusted in a coupling mode. In other words, only the coal is burned in the boiler, and the detecting device is installedPut 4 can the boiler afterbody measure the oxygen content VO in the flue gas respectively21 and carbon dioxide content VCO21; only biomass is burned in the boiler, and the detection device 4 can respectively measure the oxygen content VO in the flue gas at the tail of the boiler 22 and carbon dioxide content VCO 22; the fire coal and the biomass are coupled and combusted in the boiler, and the detection device 4 can respectively measure the oxygen content VO in the flue gas at the tail part of the boiler 23 and carbon dioxide content VCO 23。
VO thus detected by the detection device 421 and VCO21、VO 22 and VCO 22 and VO 23 and VCO 23, it is possible to obtain the content VCO of carbon dioxide based on the standard amount of oxygen when burning only the coal in the boiler21s、VCO22s and VCO2And 3s, and obtaining the heat share R of the biomass input into the boiler during the coupled combustion of the fire coal and the biomass according to the formula (1).
According to the utility model discloses a system for biomass heat share in detection coal-fired coupling biomass burning, set up detection device at the boiler afterbody, can detect when only burning coal-fired, when only burning biomass and oxygen content and carbon dioxide content in the boiler afterbody flue gas when coupling burning coal-fired and living beings, thereby be convenient for utilize formula (1) to calculate the biomass heat proportion of input boiler in the burning of coal-fired coupling biomass, the measurement and the statistics of coupling generating set biomass generated energy have been realized, the system architecture is simple relatively, and the thermal share accuracy of biomass that obtains is high moreover.
In some embodiments, the detection device 4 comprises a first detection device 41 and a second detection device 42, and the first detection device 41 is used for detecting the oxygen content in the flue gas at the tail of the boiler. The second detection device 42 is used for detecting the carbon dioxide content in the flue gas at the tail of the boiler.
Further, the first detecting device 41 is used for detecting the oxygen volume concentration in the boiler tail flue gas in a dry basis state, and the second detecting device 42 is used for detecting the carbon dioxide volume concentration in the boiler tail flue gas in the dry basis state.
In some embodiments, the system for detecting biomass heat share in the coal-fired coupled biomass combustion further comprises a coal pulverizing device 5 and a first analysis and metering device 6.
The coal pulverizing device 5 is located outside the boiler 1 and connected to the coal-fired burner 2, and the coal pulverizing device 5 is used for crushing and pulverizing the coal and supplying the coal into the coal-fired burner 2. The raw coal is crushed and pulverized by the coal pulverizing device and then is sent to a coal-fired burner in the boiler, so that the combustion of the pulverized coal in the boiler is realized.
The first analyzing and metering device 6 is positioned outside the boiler 1, is connected with the coal pulverizing device 5 and the coal-fired burner 2, and is used for detecting the coal quality components, the low heat value and the mass flow of the coal-fired entering the boiler 1. Specifically, the first analyzing and metering device 6 is disposed between the coal pulverizing device 5 and the coal-fired burner 2, and is connected to both the coal pulverizing device 5 and the coal-fired burner 2.
Further, the system for detecting the biomass heat share in the combustion of the coal-fired coupled biomass further comprises a biomass pulverizing device 7 and a second analysis metering device 8.
The biomass pulverizing device 7 is located outside the boiler 1 and connected with the biomass burner 3, and is used for crushing and pulverizing biomass and supplying the biomass into the biomass burner 3. The biomass powder is crushed and pulverized by the biomass pulverizing device and then is sent to the biomass burner in the boiler, so that the combustion of the biomass powder in the boiler is realized.
The second analysis metering device 8 is located outside the boiler 1, is connected with the biomass pulverizing device 7 and the biomass burner 3, and is used for detecting biomass components, low-level heat value and mass flow entering the boiler 1. Specifically, the second analyzing and metering device 8 is arranged between the biomass pulverizing device 7 and the biomass burner 3, and is connected with both the biomass pulverizing device 7 and the biomass burner 3.
The inventor discovers through research that for a coal-fired and biomass-coupled power generation boiler, in order to accurately measure the biomass fuel input heat share entering the boiler, the biomass fuel input heat share is analyzed and counted by the first analysis and measurement device 6 and the second analysis and measurement device 8, the biomass fuel input heat share is influenced by the changeable characteristics of the biomass fuel, the accurate measurement is difficult to achieve, the engineering requirement cannot be met, and the basis requirements of supervision and online electricity price subsidy cannot be met.
Therefore, the inventor analyzes the characteristics of the biomass fuel, eliminates the influence factors of moisture, ash and low calorific value in the biomass fuel, has relatively fixed carbon-hydrogen ratio of a certain type of biomass, considers the biomass fuel with a specific component as a reference biomass, and changes the components of flue gas of the biomass deviating from the reference biomass in actual operation after the biomass is combusted, thereby judging the share of the biomass input heat in the total input heat of the boiler, and simplifying the detection process and the method.
In some embodiments, the system for detecting biomass heat share in coal-fired coupled biomass combustion further comprises an over-fire air nozzle 9, the over-fire air nozzle 9 being disposed within the boiler 1 and above the biomass burner 3. In this embodiment, hot air can be fed separately above the biomass burner 3 and the coal-fired burner 2 through the overfire air nozzle, so that the fuel entering the boiler is combusted through the secondary air, the coal and/or biomass fuel is further combusted at the later stage, and NO is reducedXAnd (4) generating.
Therefore, when only coal is combusted in the boiler, raw coal is crushed and pulverized by the coal pulverizing device and then is fed into the coal-fired burner in the boiler, and secondary air provided by the over-fire air nozzle assists pulverized coal combustion to realize combustion of pulverized coal in the boiler. When only burning living beings in the boiler, carry out breakage, powder process with the raw coal through living beings powder process device, then send into the living beings fuel nozzle in the boiler, the secondary air that provides through the overfire air nozzle assists the burning of living beings powder, realizes the burning of living beings powder in the boiler. When the coal and the biomass are coupled and combusted in the boiler, the coal pulverizing device pulverizes and pulverizes raw coal, and then the raw coal is fed into a coal burner in the boiler; the biomass powder making device is used for crushing and making powder of raw coal, and then the raw coal is sent to a biomass burner in a boiler; the secondary air provided by the over-fire air nozzle respectively assists the combustion of the pulverized coal and the biomass powder, so that the mixed combustion of the pulverized coal and the biomass powder in the boiler is realized, and the steam is generated for power generation, thereby realizing the direct coupling power generation of the coal and the biomass in the boiler.
In some embodiments, the system for detecting the biomass heat share in the combustion of the biomass coupled with the coal further comprises an economizer 10 and an SCR denitration device 11, wherein the economizer 10 and the SCR denitration device 11 are both arranged in the boiler 1, and the detection device 4 is located between the economizer 10 and the SCR denitration device 11. Specifically, the economizer 10 is installed in a flue at the tail of the boiler, and is used for recovering waste heat of the discharged flue gas, saving energy and improving efficiency. The denitration device 11 can use ammonia or urea as a reducing agent, the reducing agent and Nitrogen Oxide (NO) in the flue gas under the action of a metal catalyst at a certain temperatureX) The reduction reaction is carried out to generate harmless nitrogen and water vapor, and the harmless nitrogen and the water vapor do not react with oxygen in the flue gas, so that the nitrogen oxide in the flue gas is removed.
In some embodiments, the system for detecting the biomass heat share in the coal-fired coupled biomass combustion further comprises an air preheater 12, and the air preheater 12 is arranged at the tail end of the boiler 1. In this embodiment, can be with the heat that carries in the exhaust flue gas in the boiler afterbody flue through the air preheater, in conducting the air before getting into the boiler through the fin, preheat the air to certain temperature to improve boiler heat exchange performance, reduce the heat energy consumption.
The following describes a method for detecting biomass heat share in coal-fired coupled biomass combustion according to an embodiment of the present invention with reference to fig. 1 and fig. 2.
The utility model discloses method for biomass heat share in detection coal-fired coupling biomass burning specifically adopts the system including boiler 1, coal-fired burner 2, biomass burner 3, first detection device 41, second detection device 42, coal-fired powder process device 5, first analytical metering device 6, biomass powder process device 7, second analytical metering device 8, overfire air nozzle 9, economizer 10, SCR denitrification facility 11 and air preheater 12. In this system, the coal burner 2, the biomass burner 3, the first detection device 41, the second detection device 42, and the overfire air nozzle 9 are all provided in the boiler 1. The coal burner 2, the biomass burner 3 and the overfire air nozzle 9 are arranged in this order in the direction from the bottom to the top and spaced apart from each other. The economizer 10, the SCR denitration device 11 and the air preheater 12 are all arranged in a tail flue of the boiler 1, the economizer 10, the SCR denitration device 11 and the air preheater 12 are arranged at intervals along the discharge direction of flue gas, and the air preheater 12 is arranged at the tail end of the tail flue of the boiler 1.
The coal-fired pulverizing device 5, the first analyzing and metering device 6, the biomass pulverizing device 7 and the second analyzing and metering device 8 are arranged outside the boiler 1. A coal pulverizing apparatus 5 is connected to the coal-fired burner 2 to pulverize and pulverize the coal and supply it to the coal-fired burner 2. The first analysis metering device 6 is arranged between the coal pulverizing device 5 and the coal-fired burner 2 and is connected with both the coal pulverizing device 5 and the coal-fired burner 2. A biomass pulverizing device 7 and a biomass burner 3 to crush and pulverize biomass and supply the biomass into the biomass burner 3. The second analysis metering device 8 is arranged between the biomass powder making device 7 and the biomass burner 3 and is connected with both the biomass powder making device 7 and the biomass burner 3.
The utility model discloses method for detecting biomass heat share in burning of coal-fired coupling biomass includes following steps:
when only the coal is burned in the boiler 1, the oxygen content VO in the flue gas on a dry basis is measured at the tail of the boiler 1 by means of the first detection device 4121, measuring the content VCO of the carbon dioxide in the flue gas under the dry basis through a second detection device 4221；
When only biomass is burned in the boiler 1, the oxygen content VO in the flue gas on a dry basis is measured at the tail of the boiler 1 by means of the first detection device 4122, measuring the content VCO of the carbon dioxide in the flue gas under the dry basis through a second detection device 4222；
When the fire coal and the biomass are combusted in the coupled mode in the boiler 1, on one hand, the lower calorific value LHV1 and the mass flow m1 of the fire coal are detected through the first analytical metering device 6, and the lower calorific value LHV2b and the mass flow m2 of the reference biomass are detected through the second analytical metering device 8; on the other hand, the oxygen content VO in the flue gas under dry basis is measured at the tail part of the boiler 1 through a first detection device 4123, measuring the content VCO of the carbon dioxide in the flue gas under the dry basis through a second detection device 4223；
Considering the difference of the smoke components when the boiler 1 burns under different excess air coefficients, the three carbon dioxide contents are firstly converted into the concentrations under the 6% oxygen standard, which are respectively:
the heat share R of biomass input into a boiler during coupled combustion of coal and biomass is obtained according to the following formula (1):
further, the method for detecting the biomass heat share in the combustion of the coal-fired coupled biomass provided by the embodiment of the invention further comprises the following steps:
the heat share R of biomass input into a boiler during the coupled combustion of the fire coal and the biomass is obtained according to the following formula1：
Comparing R and R1It is verified whether the error of R obtained by equation (1) meets operational and metering requirements.
Further, it is contemplated that the lower calorific value of the biomass charged to the furnace varies with the moisture and ash content of the biomass. Wherein the moisture and the ash content of the reference biomass are Mar2b and Aar2b respectively, the moisture and the ash content of the biomass entering the furnace are Mar2 and Aar2 respectively, and the lower calorific value of the biomass entering the furnace is set to LHV2, then
Obtaining the heat share R of the biomass input into the boiler during the coupled combustion of the coal and the biomass according to the following formula (5) and substituting the formula (6) into the formula (5)0：
Comparing R and R0It is verified whether the error of R obtained by equation (1) meets operational and metering requirements.
Because the moisture and the ash in the biomass do not generate heat during combustion, the heat generated by the combustion of the biomass mainly comes from carbon and hydrogen elements, once the moisture and the ash in the biomass entering the boiler deviate from the reference biomass, the lower calorific value of the biomass can be corrected through a formula (6), meanwhile, when the biomass is combusted in the boiler, the moisture and the ash deviating from the components of the reference biomass do not influence the components of dry-based flue gas, and CO in the dry-based flue gas2The volume concentration depends only on the type of biomass, i.e. the carbon to hydrogen ratio.
The rationality of the present application is analyzed below with reference to some specific coal and biomass coupled combustion cases.
For a 600MW thermal power generating unit, the fire coal is lignite, the biomass is corn straw, and the main coal quality data of the fire coal is as follows: car is 38.73%, Har is 2.57%, Oar is 12.36%, Nar is 0.79%, Sar is 0.28%, Aar is 14.38%, Mar is 30.89%, LHV is 13090 kJ/kg; the biomass fuel comprises the following components: the biomass having the above composition was defined as reference biomass, and Car was 34.75%, Har was 4.07%, Oar was 32.02%, Nar was 0.42%, Sar was 0.03%, Aar was 3.7%, Mar was 25.01%, and LHV was 11860 kJ/kg.
When only the fire coal is combusted in the boiler, the detection device 4 detects and obtains O in the flue gas2Volume concentration and CO2Volume concentration and conversion to CO according to formula (2)2On a dry basis, 6% O2The volume concentration under the conditions was 13.99%.
When only biomass is combusted in the boiler, O in the flue gas is detected by the detection device 42Volume concentration and CO2The volume concentration is converted into CO according to the formula (3)2On a dry basis, 6% O2The volume concentration under the conditions was 14.85%.
When the boiler is used for coupling combustion of the fire coal and the biomass, namely, the fire coal is coupled with the biomass for power generation, the coal combustion amount is 218.2t/h through the first analysis metering device 6; the biomass of 250t/h is obtained by the second analysis and metering device 8, and the calculated share R of the input heat of the biomass fuel in the total input heat of the boiler150.93%;
detecting by the detection device 4 to obtain O in the flue gas2Volume concentration and CO2The volume concentration is converted into CO according to the formula (4)2On a dry basis, 6% O2The volume concentration under the condition is 14.41 percent, and the input heat quantity share R of the biomass fuel calculated by the method of the utility model is 48.98 percent.
Therefore, the biomass fuel input heat share R obtained by the method of the utility model and the biomass fuel input heat share R obtained by calculating the coal burning quantity and the biomass quality1Compared with the prior art, the error of the input heat quantity share R of the biomass fuel obtained by the method of the utility model is about 1.9 percent, and the operation and metering requirements are met.
When the boiler is used for coupling combustion of the fire coal and the biomass, namely, during power generation operation of coupling the fire coal and the biomass, the coal combustion amount is 304.1t/h through the first analyzing and metering device 6, and the input biomass is 150t/h through the second analyzing and metering device 8, so that the calculated share R of the input heat of the biomass fuel in the total input heat of the boiler130.89%;
detecting by the detection device 4 to obtain O in the flue gas2Volume concentration and CO2The volume concentration is converted into CO according to the formula (4)2On a dry basis, 6% O2The volume concentration under the condition is 14.24 percent, and the input heat quantity share R of the biomass fuel calculated by the method of the utility model is 29.13 percent.
Therefore, the biomass fuel input heat share R obtained by the method of the utility model and the biomass fuel input heat share R obtained by calculating the coal burning quantity and the biomass quality1Compared with the prior art, the error of the input heat quantity share R of the biomass fuel obtained by the method of the utility model is about 1.8 percent, and the operation and metering requirements are met.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (6)
1. A system for detecting biomass heat share in coal-fired coupled biomass combustion, comprising:
a boiler;
the coal-fired burner is arranged in the boiler and used for burning coal;
the biomass burner is arranged in the boiler, positioned above the coal-fired burner and used for burning biomass;
and the detection device is arranged at the tail part of the boiler and is used for detecting the oxygen content and the carbon dioxide content in the tail flue gas of the boiler when only the fire coal is combusted, only the biomass is combusted and the fire coal and the biomass are combusted in a coupling manner.
2. The system for detecting biomass heat share in coal-fired coupled biomass combustion as claimed in claim 1, wherein the detection device comprises a first detection device and a second detection device, the first detection device is used for detecting the oxygen content in the tail flue gas of the boiler, and the second detection device is used for detecting the carbon dioxide content in the tail flue gas of the boiler.
3. The system for detecting biomass heat share in coal-fired coupled biomass combustion as claimed in claim 2, wherein the first detection device is used for detecting the oxygen volume concentration in the boiler tail flue gas in a dry basis state, and the second detection device is used for detecting the carbon dioxide volume concentration in the boiler tail flue gas in the dry basis state.
4. The system for detecting biomass heat share in coal-fired coupled biomass combustion as claimed in claim 1, further comprising:
the coal pulverizing device is positioned outside the boiler and connected with the coal-fired burner and is used for crushing and pulverizing the coal and supplying the coal into the coal-fired burner;
the first analysis and measurement device is positioned outside the boiler, is connected with the coal pulverizing device and the coal-fired burner, and is used for detecting coal quality components, lower heating value LHV1 and mass flow m1 of the coal-fired entering the boiler;
the biomass pulverizing device is positioned outside the boiler and is connected with the biomass burner, and is used for crushing and pulverizing biomass and supplying the biomass into the biomass burner;
and the second analytical metering device is positioned outside the boiler, is connected with the biomass pulverizing device and the biomass burner, and is used for detecting biomass components, a lower calorific value LHV2 and a mass flow m2 entering the boiler.
5. The system for detecting biomass heat share in coal-fired coupled biomass combustion as claimed in claim 4, wherein the biomass is a reference biomass.
6. The system for detecting biomass heat share in coal-fired coupled biomass combustion as claimed in any one of claims 1-5, further comprising an over-fire air nozzle disposed within the boiler and above the biomass burner.
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| CN111505050A (en) * | 2020-05-31 | 2020-08-07 | 国家电投集团电站运营技术（北京）有限公司 | System and method for detecting biomass heat share in coal-fired coupled biomass combustion |
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