CN111085091A - Method for determining desulfurization proportion inside and outside circulating fluidized bed boiler and desulfurization system - Google Patents
Method for determining desulfurization proportion inside and outside circulating fluidized bed boiler and desulfurization system Download PDFInfo
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Abstract
The application discloses a method for determining the inside and outside desulfurization proportion of a circulating fluidized bed boiler and a desulfurization system. The method comprises the following steps: under the same preset condition, determining multiple groups of data by adjusting the using amount of the desulfurizing agent in the furnace in unit time or the using amount of the desulfurizing agent outside the furnace in unit time; calculating the unit electric quantity power generation cost corresponding to each group of data according to the actual consumption of the in-furnace desulfurizer in unit time, the actual consumption of the out-furnace desulfurizer in unit time and the actual influence of the added in-furnace desulfurizer on the boiler efficiency in unit time in each group of data; and taking the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization in the data corresponding to the lowest unit electricity generation cost as the determined optimized proportion. When the desulphurization inside the furnace and the desulphurization outside the furnace are distributed according to the optimized proportion, the power generation cost per unit electric quantity is the lowest, so the problems in the prior art can be solved.
Description
Technical Field
The application relates to the field of power generation, in particular to a method for determining the inside and outside desulfurization proportion of a circulating fluidized bed boiler and a desulfurization system.
Background
SO2Circulating fluidized bed boiler as coal fired power plant (circu)A circulating fluidized bed boiler), the emission of which is strictly limited by national emission standards, is generally provided with an in-furnace desulfurization system for performing in-furnace desulfurization on flue gas generated by burning coal in a boiler.
In practical applications, since national emission standards are generally increasing, in-furnace desulfurization by means of an in-furnace desulfurization system alone may not meet the regulations in the national emission standards. It is often necessary to add an external desulfurization system, such as a wet or semi-dry process, in addition to the in-furnace desulfurization system to perform external desulfurization so as to meet national emission standards by a combination of in-furnace and external desulfurization.
When the in-furnace desulfurization and the out-furnace desulfurization are combined for desulfurization, due to the difference of desulfurization cost between the two desulfurization modes, the proportion of the in-furnace desulfurization and the out-furnace desulfurization needs to be determined so as to reduce the overall desulfurization cost under the condition of meeting the national emission standard.
Disclosure of Invention
The method for determining the ratio of the internal desulfurization to the external desulfurization of the circulating fluidized bed boiler and the desulfurization system provided by the embodiment of the application can be used for solving the problems in the prior art.
The embodiment of the application provides a method for determining the ratio of in-furnace desulfurization to out-furnace desulfurization of a circulating fluidized bed boiler, which comprises the following steps:
under the same preset condition, determining multiple groups of data by adjusting the using amount of the in-furnace desulfurizing agent in unit time or the using amount of the out-furnace desulfurizing agent in unit time, wherein each group of data comprises the actual using amount of the in-furnace desulfurizing agent in unit time, the actual using amount of the out-furnace desulfurizing agent in unit time corresponding to the actual using amount of the in-furnace desulfurizing agent in unit time, the actual influence amount of the added in-furnace desulfurizing agent on the boiler efficiency and the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization;
calculating the unit electricity generation cost corresponding to each group of data according to the determined actual consumption of the in-furnace desulfurizer in unit time, the actual consumption of the out-furnace desulfurizer in unit time and the actual influence of the added in-furnace desulfurizer on the boiler efficiency in each group of data;
determining the lowest unit electric quantity power generation cost from unit electric quantity power generation costs respectively corresponding to each group of data;
and taking the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization in the data corresponding to the lowest unit electricity generation cost as the determined optimized proportion.
The embodiment of the application also provides a method for determining the ratio of the desulphurization inside and outside the circulating fluidized bed boiler, which comprises the following steps:
determining a corresponding relation function of the calcium-sulfur ratio in the furnace and the power generation cost of unit electric quantity under the preset boundary condition;
calculating the in-furnace calcium-sulfur ratio corresponding to the lowest unit electricity generation cost through the corresponding relation function;
and determining the optimal ratio of the in-furnace desulfurization to the out-furnace desulfurization under the preset boundary condition according to the in-furnace calcium-sulfur ratio corresponding to the lowest unit electricity generation cost.
The embodiment of the application also provides a desulfurization system applied to the circulating fluidized bed boiler, and the desulfurization system adopts the method for determining the ratio of the desulfurization inside the circulating fluidized bed boiler to the desulfurization outside the circulating fluidized bed boiler to distribute the ratio of the desulfurization inside the circulating fluidized bed boiler to the desulfurization outside the circulating fluidized bed boiler.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
by adopting the method for determining the ratio of the desulfurization inside and outside the circulating fluidized bed boiler provided by the embodiment of the application, under the same preset condition, determining a plurality of groups of data by adjusting the using amount of the desulfurizing agent in the furnace in unit time or the using amount of the desulfurizing agent outside the furnace in unit time, wherein each group of data comprises the actual consumption of the desulfurizing agent in the furnace in unit time, the actual consumption of the desulfurizing agent outside the furnace in unit time corresponding to the actual consumption of the desulfurizing agent in the furnace in unit time, the actual influence quantity of the added desulfurizing agent inside the furnace on the boiler efficiency and the actual distribution ratio of the desulfurizing agent inside the furnace to the desulfurizing agent outside the furnace, then, calculating the unit electricity generation cost corresponding to each group of data according to the actual consumption of the in-furnace desulfurizer in unit time, the actual consumption of the out-furnace desulfurizer in unit time and the actual influence of the added in-furnace desulfurizer on the boiler efficiency in unit time in each group of data; and the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization in the data corresponding to the lowest unit electricity generation cost is used as the determined optimized proportion. When the desulphurization inside the furnace and the desulphurization outside the furnace are distributed according to the optimized proportion, the power generation cost per unit electric quantity is the lowest, so the problems in the prior art can be solved.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic flow chart of a specific implementation of a method for determining a ratio of desulfurization within and outside a circulating fluidized bed boiler according to an embodiment of the present application;
FIG. 2 is a graph showing the relationship between the power generation cost per unit of electricity and the percentage of sulfur removal in the furnace, calculated under three different preset conditions provided in the embodiment of the present application;
FIG. 3 is a diagram illustrating a relationship between power generation cost per unit of electricity and percentage of sulfur removal in a furnace, calculated under two different preset conditions according to an embodiment of the present application;
FIG. 4 is a schematic flow chart showing a specific implementation of another method for determining a ratio of desulfurization within and outside a circulating fluidized bed boiler according to an embodiment of the present application;
FIG. 5 is a curve showing the correspondence between the desulfurization efficiency in a furnace and the ratio of calcium to sulfur in the furnace according to the embodiment of the present application;
fig. 6 is a curve of a corresponding relationship between a flow rate of a denitration urea solution and a ratio of calcium to sulfur in a furnace provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
As described above, since the CFB boiler performs the in-furnace desulfurization by using the in-furnace desulfurization system alone, it is generally difficult to satisfy the regulations in the national emission standards, and therefore, in practical applications, the in-furnace desulfurization and the out-furnace desulfurization are combined to perform the desulfurization. The cost of the external desulfurization mode is relatively high, and the overall cost of desulfurization is reduced while the national emission standard is met.
Based on the above, the embodiment of the application provides a method for determining the ratio of in-furnace desulfurization to out-furnace desulfurization of a circulating fluidized bed boiler, which is used for determining the optimal ratio of in-furnace desulfurization to out-furnace desulfurization in the circulating fluidized bed boiler, so that the overall cost of desulfurization is reduced under the condition of meeting the national emission standard.
For the convenience of describing the method provided by the present application, the calculation formulas of the plurality of fees constructed by the present application may be described first. These formulas can be used to calculate the desulfurizing agent cost outside the unit generating capacity furnace, the desulfurizing agent cost in the unit generating capacity furnace, the efficiency loss cost of the unit generating capacity boiler, etc. And the unit electricity generation cost can be calculated through the calculated unit electricity generation amount external desulfurizer cost, unit electricity generation amount internal desulfurizer cost and unit electricity generation amount boiler efficiency loss.
The provided furnace desulfurizer cost calculation formula (hereinafter referred to as formula 1) can be used for calculating the desulfurizer cost in a unit power generation amount, and is shown as follows:
in the formula for calculating the cost of desulfurizing agent in furnace, Edes.inThe calculated cost of the desulfurizing agent in the unit power generation amount furnace can be 1 kilowatt hour or 1000 kilowatt hours, etc.; q. q.sdes.inThe actual amount of the desulfurizing agent in the furnace is substituted into the formula within a unit time, such as 1 hour or 1 minute; p is a radical ofdes.inThe price of the desulfurizing agent in the furnace is, such as yuan/ton; p is the active power of the generator set, such as watts or kilowatts.
This equation 1 can be defined by three parameters pdes.in、qdes.inAnd P, calculating the cost of the desulfurizing agent in the unit generating capacity furnace, wherein the cost of the desulfurizing agent in the unit generating capacity furnace can be used for measuring the cost consumed by the desulfurizing agent in the furnace when the generating capacity is 1 unit.
The provided formula for calculating the cost of the external desulfurizer outside the furnace (hereinafter referred to as formula 2) can be used for calculating the cost of the external desulfurizer outside the furnace per unit generated energy, and is shown as follows:
in the formula 2, Edes.outThe calculated cost of the desulfurizing agent outside the unit generated energy furnace; q. q.sdes.outThe actual amount of the desulfurizing agent outside the furnace in unit time is substituted into the formula; p is a radical ofdes.outThe price of the desulfurizing agent outside the furnace; and P is the active power of the generator set.
The equation 2 is based on three parameters p givendes.out、qdes.outAnd P, calculating the cost of the external desulfurizer per unit of generated energy, wherein the cost of the external desulfurizer per unit of generated energy can be used for measuring the cost consumed by the external desulfurizer when the generated energy is 1 unit.
The provided boiler efficiency loss cost calculation formula can be used for calculating the boiler efficiency loss cost per unit generating capacity after the desulfurizer in the boiler is added. The desulfurizer in the boiler mainly causes the loss of boiler efficiency through three aspects, namely, the air quantity required by combustion is increased, so that the change of flue gas components and flue gas quantity is caused, the sensible heat loss of ash residues is caused by increasing the weight of ash residues, and the heat loss is caused by the heat absorption reaction and the desulfurization salinization reaction generated during the calcination of the desulfurizer in the boiler. The boiler efficiency loss cost of unit generated energy calculated by the boiler efficiency loss cost calculation formula can be used for measuring the cost loss caused by the boiler efficiency loss caused by the added desulfurizing agent in the boiler when the generated energy is 1 unit.
The formula for calculating the boiler efficiency loss cost (hereinafter referred to as formula 3) is specifically as follows:
in formula 3, E' is the calculated boiler efficiency loss cost per unit generated energy; p is a radical offIs the unit price of the standard coal; bgPower generation coal consumption of unit without adding desulfurizing agent in furnace ηtThe boiler efficiency is delta η when no desulfurizing agent is added into the boilertThe added desulfurizing agent in the boiler has actual influence on the boiler efficiency.
In addition, E is calculated by equations 1 to 3des.in、Edes.outAnd E', the three can be summed, so as to calculate the power generation cost per unit of electric quantity. The unit electricity generation cost can be used for measuring the total cost of the desulfurizer cost in the boiler, the desulfurizer cost outside the boiler and the boiler efficiency loss cost when the generated energy is 1 unit.
The calculation formula of the power generation cost per unit electric quantity (hereinafter referred to as formula 4) can also be expressed as:
in the formula 4, E is the calculated power generation cost per unit electric quantity, and the specific meanings of other symbols in the formula 4 are the same as those in the formulas 1 to 3, and are not described herein again.
The method for determining the ratio of the desulfurization inside and outside the circulating fluidized bed boiler provided by the application has the specific flow diagram as shown in figure 1, and comprises the following steps:
step S11: under the same preset condition, determining multiple groups of data by adjusting the using amount of the desulfurizing agent in the furnace in unit time or the using amount of the desulfurizing agent outside the furnace in unit time.
Wherein, the same preset conditions can be the same active power of the generator set, the same received base sulfur content of the coal as fired and the same national emission standard.
For example, when each set of data is determined, the active power of the generator set is 135 Megawatts (MW), the content of the base sulfur received from the coal as fired is 0.5%, and the national emission standards are the latest national emission standards.
Each set of data comprises the actual consumption of the desulfurizing agent in the furnace in unit time, the actual consumption of the desulfurizing agent outside the furnace in unit time corresponding to the actual consumption of the desulfurizing agent in the furnace in unit time, the actual influence quantity of the added desulfurizing agent inside the furnace on the boiler efficiency, and the actual distribution ratio of the desulfurizing agent inside the furnace to the desulfurizing agent outside the furnace.
For example, the set of data includes the actual amount of the in-furnace desulfurization agent per unit time X1, the actual amount of the out-furnace desulfurization agent per unit time Y1, the actual influence amount Z1 of the added in-furnace desulfurization agent on the boiler efficiency, and the actual distribution ratio N of the in-furnace desulfurization agent to the out-furnace desulfurization agent.
In practical applications, after the preset conditions are determined (for example, a certain national emission standard is determined, and the active power of the target generator set and the received basic sulfur content of the coal as fired are determined), multiple sets of data can be directly determined through measurement.
Step S12: after the multiple groups of data are determined, the unit electricity generation cost corresponding to each group of data is calculated according to the actual consumption of the in-furnace desulfurizer in unit time, the actual consumption of the out-furnace desulfurizer in unit time and the actual influence of the added in-furnace desulfurizer on the boiler efficiency in each group of data.
The cost of the desulfurizer in the unit generating capacity furnace corresponding to each group of data can be calculated according to the price of the desulfurizer in the furnace and the actual consumption of the desulfurizer in the furnace in unit time in each group of data. For example, each set of data may be used as current data, and the actual amount of the in-furnace desulfurizer and the price of the in-furnace desulfurizer in unit time in the current data are substituted into the above formula 1, so as to calculate the cost of the in-furnace desulfurizer per unit generated energy corresponding to the current data, and finally, the cost of the in-furnace desulfurizer per unit generated energy corresponding to each set of data may also be calculated.
Similarly, the cost of the desulfurizing agent outside the furnace corresponding to the unit generating capacity of each group of data can be calculated according to the price of the desulfurizing agent outside the furnace and the actual using amount of the desulfurizing agent outside the furnace in the unit time in each group of data. Or each group of data can be used as the current data respectively, so that the actual amount of the external desulfurizer in unit time and the price of the external desulfurizer in the current data are substituted into the formula 2, the cost of the external desulfurizer per unit generated energy of the current data is calculated, and finally, the cost of the external desulfurizer per unit generated energy corresponding to each group of data is calculated.
When the boiler efficiency loss consumption of the unit power generation amount corresponding to each group of data is calculated according to the boiler efficiency when the in-furnace desulfurizer is not added and the actual influence amount of the added in-furnace desulfurizer on the boiler efficiency in each group of data, each group of data can also be used as the current data, so that the actual influence amount of the added in-furnace desulfurizer on the boiler efficiency in the current data and the boiler efficiency when the in-furnace desulfurizer is not added are substituted into the formula 3, the boiler efficiency loss cost of the unit power generation amount of the current data is calculated, and finally, the boiler efficiency loss cost of the unit power generation amount corresponding to each group of data is calculated.
After the desulfurizing agent cost in the unit power generation furnace, the desulfurizing agent cost outside the unit power generation furnace and the efficiency loss cost of the unit power generation boiler corresponding to each group of data are calculated, the desulfurizing agent cost in the unit power generation furnace, the desulfurizing agent cost outside the unit power generation furnace and the efficiency loss cost of the unit power generation boiler corresponding to each group of data are added by using formula 4, so that the unit power generation cost corresponding to the group of data can be calculated.
It should be further noted that, when the cost of the desulfurizing agent in the unit power generation amount furnace, the cost of the desulfurizing agent outside the unit power generation amount furnace, and the loss of the efficiency of the unit power generation amount boiler are calculated respectively through the formulas 1 to 3, the sequence of the three is not limited here.
Step S13: after the unit electricity generation cost corresponding to each group of data is calculated, the lowest unit electricity generation cost is determined from the unit electricity generation costs corresponding to each group of data.
In practical applications, the lowest power generation cost per unit electric quantity may be determined from the power generation costs per unit electric quantity respectively corresponding to each group of data, for example, the power generation costs per unit electric quantity respectively corresponding to each group of data may be sorted into different sizes, so that the lowest power generation cost per unit electric quantity is selected according to the result of the sorting into different sizes.
Step S14: and after the lowest unit electricity generation cost is determined, taking the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization in the data corresponding to the lowest unit electricity generation cost as the determined optimized proportion.
According to the optimized proportion determined in step S14, when the in-furnace desulfurization and the out-furnace desulfurization are distributed according to the optimized proportion, the power generation cost per unit amount of electricity is the lowest (lower than the power generation cost per unit amount of electricity in other proportions), and therefore the problems in the prior art can be solved.
It should be further noted that, in practical applications, when the circulating fluidized bed boiler is subjected to desulfurization, denitrification is generally required to be performed on the circulating fluidized bed boiler, and the ratio distribution of desulfurization inside the boiler and desulfurization outside the boiler may also generally affect the consumption of the desulfurizing agent, thereby affecting the denitrification cost. Therefore, when the power generation cost per unit electric quantity is calculated, the denitration agent cost in the furnace per unit power generation amount can be simultaneously taken into consideration.
The provided furnace denitration agent cost calculation formula (hereinafter referred to as formula 5) can be used for calculating the cost of the denitration agent in the furnace per unit power generation amount, and the formula is as follows:
formula for calculating cost of denitrifier in furnaceIn, EdenCalculating the cost of the denitrifier in the furnace for the unit generated energy; q. q.sdenThe actual amount of the denitration agent in the furnace in unit time is substituted into the formula; p is a radical ofdenThe price of the denitrifier in the furnace, and the like; and P is the active power of the generator set.
This equation 5 can be defined by three parameters pden、qdes.inAnd P, calculating the cost of the denitration agent in the unit power generation furnace, wherein the cost of the denitration agent in the unit power generation furnace can be used for measuring the cost consumed by the denitration agent in the furnace when the power generation is 1 unit.
In addition, E is calculated by the formulas 1 to 3 and 5des.in、Edes.outE' and EdenThen, the four can be summed up to calculate the unit electricity generation cost, and at this time, the total cost of the unit electricity can be reflected more accurately because the unit electricity generation cost considers the cost of the desulfurizing agent inside and outside the furnace, the cost of the denitrifying agent and the cost of the boiler efficiency loss.
Thus, through Edes.in、Edes.outE' and EdenThe calculation formula of the calculated power generation cost per unit electric quantity (hereinafter referred to as formula 6) can also be expressed as:
in the formula 6, E is a passing Edes.in、Edes.outE' and EdenThe specific meaning of the calculated power generation cost per unit electric quantity is the same as that of the other symbols in formula 4 in formulas 1 to 3 and formula 5, and is not described herein again.
After the unit electricity generation cost corresponding to each group of data is calculated by the formula 6, the optimal ratio of the in-furnace desulfurization to the out-furnace desulfurization can be finally determined by adopting the manners of the step S13 and the step S14.
For convenience of understanding, the method for determining the ratio of the desulfurization between the inside and the outside of the circulating fluidized bed boiler described above will be described with reference to specific examples one and two.
Example one: the installed power of the generator set is 135MW, and the circulating fluidized bed boiler is a natural circulation, single steam drum, single intermediate reheating and ultrahigh pressure circulating fluidized bed boiler. The in-furnace desulfurization system is an in-furnace calcium spraying desulfurization device which conveys limestone powder into the furnace from a secondary air port below a furnace front wall. The external desulfurization system adopts external wet desulfurization, in particular to an external flue gas desulfurization system which adopts limestone-gypsum wet desulfurization process and inlet SO2Mass concentration 800mg/Nm3Efficiency of desulfurization
The content was 95%.
Price of related materials: 118 yuan/t of desulfurizer (limestone) in the furnace, 3.1 yuan/t of water, 0.2595 yuan/kWh of electricity, 1850 yuan/t of denitrifier (urea) in the furnace, 752 yuan/t of standard coal unit price.
As shown in fig. 2, the calculated power generation cost per unit of electricity is plotted against the actual distribution ratio of the in-furnace desulfurization and the out-furnace desulfurization (which can be expressed as the in-furnace desulfurization ratio, and the corresponding out-furnace desulfurization ratio is 1 — the in-furnace desulfurization ratio) under three different preset conditions.
As can be seen from fig. 2, under the preset conditions that the active power of the generator set is 135MW, the received base sulfur content of the as-fired coal is 0.5%, and the national emission standards are the current latest national emission standards, different groups of different data are measured, and the corresponding power generation cost per unit of electricity is calculated according to the formula 6, and when the power generation cost per unit of electricity is the lowest, the distribution proportion is that desulfurization in the furnace accounts for about 40%.
As can be seen from fig. 2, another preset condition is that the active power of the generator set is 70MW, the received base sulfur content of the coal as fired is 0.8%, and the national emission standards are all the current latest national emission standards, under the preset condition, different groups of different data are measured, and the corresponding power generation cost per unit of electricity is calculated according to the formula 6, and when the power generation cost per unit of electricity is the lowest, the distribution proportion is that the desulfurization in the furnace accounts for about 50%.
As can be seen from fig. 2, another preset condition is that the active power of the generator set is 70MW, the received base sulfur content of the coal as fired is 0.5%, and the national emission standards are all the current latest national emission standards, under the preset condition, different groups of different data are measured, and the corresponding power generation cost per unit of electricity is calculated according to the formula 6, and when the power generation cost per unit of electricity is the lowest, the distribution proportion is that desulfurization in the furnace accounts for about 35%.
Example two: the installed power of the generator set is 350MW, the circulating fluidized bed boiler is a circulating fluidized bed boiler with supercritical direct current, once intermediate reheating, single hearth, balanced ventilation and solid slag discharge, and the desulfurizing agent in the boiler enters the hearth through the inclined leg of the material returning device. The external desulfurization system is a semidry external desulfurization system, which adopts a flue gas circulating fluidized bed semidry desulfurization process and designs an inlet SO2Mass concentration 1750mg/Nm3And the desulfurization efficiency is 95 percent.
Price of related materials: 89 yuan/t of desulfurizer (limestone) in the furnace, 333 yuan/t of desulfurizer (quick lime) outside the furnace, 3 yuan/t of water, 0.25 yuan/kWh of electricity, 1388 yuan/t of denitrifier (urea) in the furnace and 660 yuan/t of standard coal.
Fig. 3 is a graph showing the relationship between the power generation cost per unit electric quantity and the percentage of desulfurization in the furnace, which is calculated under two different preset conditions.
As can be seen from fig. 3, under the preset condition that the active power of the generator set is 350MW, the received base sulfur content of the as-fired coal is 0.9%, and the national emission standards are all the current latest national emission standards, different groups of different data are measured, and the corresponding power generation cost per unit of electric quantity is respectively calculated according to the formula 6, and when the power generation cost per unit of electric quantity is the lowest, the distribution proportion is that desulfurization in the furnace accounts for about 85%.
As can be seen from fig. 3, under the preset condition that the active power of the generator set is 175MW, the received base sulfur content of the as-fired coal is 0.9%, and the national emission standards are all the current latest national emission standards, different groups of different data are measured, and the corresponding power generation cost per unit of electricity is calculated according to the formula 6, and when the power generation cost per unit of electricity is the lowest, the distribution proportion is that desulfurization in the furnace accounts for about 75%.
The application also provides a method for determining the ratio of the desulfurization inside and outside the circulating fluidized bed boiler, which comprises the following steps in a flow chart shown in fig. 4:
step S41: and under the preset boundary condition, determining a corresponding relation function of the calcium-sulfur ratio in the furnace and the power generation cost of unit electric quantity.
The preset boundary conditions can be predetermined national emission standards, the received base sulfur content of the coal as fired, the initial concentration of sulfur dioxide, the rated load coal feeding amount, the average flue gas amount, the external calcium-sulfur ratio of an external desulfurization system, and the like.
If the power generation cost per unit electric quantity is equal to Δ η according to the above equation 6t、qdes.in、qdes.outAnd q isdenIf the power generation cost per unit electric quantity is related to delta η according to the above formula 4t、qdes.inAnd q isdes.outAnd (4) correlating. These parameters in equations 4 and 6 can be combined with the furnace calcium to sulfur ratio rCa/SBy converting equations 4 and 6 into rCa/SAs a function of (c).
In practical applications, the desulfurizing agent in the furnace has the greatest influence on the desulfurization heat loss among the losses of the desulfurizing agent added to the boiler efficiency, and the rate of change of heat loss accounts for usually more than 90% as the calcium-sulfur ratio in the furnace changes, so the amount of actual influence of the desulfurizing agent added to the boiler efficiency, Δ ηtCan be expressed approximately as desulfurization heat loss of the desulfurizing agent in the furnace, and can be calculated according to the following formula (hereinafter referred to as formula 7).
In this equation 7, ηCaCO3η percent of decomposition rate of desulfurizing agent (such as calcium carbonate in limestone) in furnaceSO2The desulfurization efficiency in the furnace,%; r isCa/SThe calcium-sulfur ratio in the furnace is shown; omegaS.arThe basic sulfur content is obtained for the coal as fired.
Based on the test data, ratingUnder load, the bed temperature is 880 ℃, the basic sulfur content is 0.6 percent, and the desulfurization efficiency in the furnace is ηSO2Ratio of calcium to sulfur in furnaceCa/SThe relationship is shown in FIG. 5.
Fitting η from this FIG. 5SO2And rCa/SThe correspondence of (d) is formula 8 shown below:
Further, the formula for defining the calcium-sulfur ratio in the furnace (hereinafter referred to as formula 9) is as follows:
in the formula 9, rCa/SThe calcium-sulfur ratio in the furnace is shown; omegaCaCO3.desIs the mass fraction percent of calcium carbonate in the desulfurizer; omegaS.arThe content of the basic sulfur is obtained for the coal as fired,%; q. q.scThe mass flow of the fuel entering the furnace is t/h.
Q can be expressed by the equation 9des.inUsing the calcium-sulfur ratio r in the furnaceCa/STo indicate.
For qdes.outRatio of calcium to sulfur in furnaceCa/SThe correspondence relationship of (a) can be determined by the following equations 10 and 11. Equation 10 is shown below:
in this formula 10, ρSO2.outFor removing SO from outside of the furnace2Total amount; rhoSO2.0Is SO in a furnace2The original discharge amount can be in mg/Nm3；ηSO2The desulfurization efficiency in the furnace is percent.
The out-of-furnace SO removal can be calculated by the formula 102Total amount ρSO2.outAnd substituting the calculated actual amount q of the desulfurizing agent outside the furnace in the unit time into the following formula 11des.out。
Equation 11 is as follows:
in the formula 11, V is the amount of flue gas at the inlet of the desulfurization tower; rhoSO2.outFor removing SO from outside of the furnace2The total amount, which can be calculated by equation 9; r isoutThe calcium-sulfur ratio outside the furnace; omegaCaO.outIs the mass fraction percent of calcium oxide in the desulfurizing agent outside the furnace; q. q.sdes.outIs the actual amount of the desulfurizing agent outside the furnace in unit time.
Therefore, q can be calculated by formula 10 and formula 11des.out。
From the above-described equations 7 to 11, Δ η can be calculatedt、qdes.in、qdes.outAs a function of the calcium-sulfur ratio in the furnace and will ultimately result in Δ ηt、qdes.in、qdes.outRespectively by rCa/SSo that the electricity generation cost per unit electric quantity E in the formula 4 is finally expressed as rCa/SAnd the corresponding relation function of the calcium-sulfur ratio in the furnace and the power generation cost per unit electric quantity is generated.
In addition, according to the test data, the flow rate V of the denitrified urea solution is set at the rated loadden(the unit can be cubic meter per hour, etc.) and the ratio r of calcium to sulfur in the furnaceCa/SThe relationship is shown in fig. 6. In FIG. 6, when the denitration agent in the furnace (denitration urea may be used) is not added, the initial NOx concentration is set to 280mg/Nm3。
From this FIG. 6, the following calculation (referred to as equation 12) can be fitted:
Vden＝0.0015rCa/S 4-0.0251rCa/S 3+0.145rCa/S 2-0.02882rCa/S+0.3663
in this formula 12, VdenThe flow rate of the denitrified urea solution is the value of the denitrified urea solution and the actual dosage of the denitrified agent in the furnace in unit timeOne-to-one correspondence qdenCan pass through VdenTo calculate qden；rCa/SThe calcium-sulfur ratio in the furnace. Thereby passing through the equations 12 and VdenAnd q isdenCorresponding relation of (a) to (b), qdenIs represented by rCa/SAs a function of (c).
Therefore, combining equation 12 with equations 7 through 11 above, Δ η can be expressedt、qdes.in、qdes.outAnd q isdenAll adopt the calcium-sulfur ratio r in the furnaceCa/SExpressed and substituted into the formula 6 to finally generate the calcium-sulfur ratio r in the furnaceCa/SAnd the corresponding relation function of the unit electric quantity power generation cost E.
Step S42: and calculating the in-furnace calcium-sulfur ratio corresponding to the lowest unit electricity generation cost through the corresponding relation function.
Step S43: and determining the optimal ratio of the in-furnace desulfurization to the out-furnace desulfurization under the preset boundary condition according to the in-furnace calcium-sulfur ratio corresponding to the lowest unit electricity generation cost.
The following can explain step S42 and step S43 as a whole.
The calcium-sulfur ratio r in the furnace is determinedCa/SAfter the corresponding relation function with the unit electric quantity power generation cost E, the preset boundary condition can be substituted into the corresponding relation function, so that the corresponding relation function is converted into the calcium-sulfur ratio r in the furnaceCa/SAnd the dependent variable E is paired with the independent variable rCa/SAnd (4) carrying out derivation so as to obtain parameters such as the calcium-sulfur ratio in the furnace and the desulfurization efficiency when the lowest unit electricity generation cost is calculated, and the parameters are shown in the following table 1. Wherein, the preset boundary conditions are as follows: the content of sulfur in the coal as fired is 0.58 percent, and SO2Initial concentration 1815mg/Nm3Rated load coal feeding amount of 200t/h and flue gas amount of 1278000Nm3H; the calcium-sulfur ratio of a wet desulphurization system outside the furnace is 1.1, and the calcium-sulfur ratio of a semi-dry desulphurization system is 1.4.
Table 1: relevant parameter at lowest unit electricity generation cost
| Type (B) | Unit of | Out-of-furnace wet method | Half-dry outside the furnace |
| Calcium sulfur ratio in furnace | / | 0.14 | 0.88 |
| Efficiency of desulfurization in furnace | ％ | 19.81 | 79.59 |
| Calcium to sulfur ratio outside furnace | / | 1.1 | 1.4 |
| External desulfurization efficiency | ％ | 97.60 | 90.55 |
| Percentage of desulfurization in furnace | ％ | 20.20 | 81.15 |
| Concentration of SO2 at furnace inlet | mg·Nm-3 | 1455 | 370 |
Under the above-mentioned preset boundary conditions, when the external desulfurization system is specifically an external wet desulfurization system, the preferable percentage of in-furnace desulfurization is 20.20%. When the external desulfurization system is a semi-dry external desulfurization system, the preferable percentage of desulfurization in the furnace is 81.15%. The difference between the two is mainly determined by the respective desulfurization processes and the material price.
And (3) respectively adjusting the assumed calcium-sulfur ratios of the external wet-process desulfurization system and the semi-dry-process desulfurization system in the preset boundary conditions to obtain the corresponding preferred internal desulfurization ratios shown in the table 2.
Table 2: optimum in-furnace desulfurization ratio under different calcium-sulfur ratios
As can be seen from tables 1 and 2, the change of the external calcium-sulfur ratio does not greatly affect the preferable internal desulfurization ratio for the external desulfurization system, and the preferable internal desulfurization ratio is about 76% to 88% when the external calcium-sulfur ratio is 1.2 to 2.0. When the external desulfurization system specifically adopts the external wet desulfurization system, the influence of the change of the external calcium-sulfur ratio on the preferable internal desulfurization ratio is obvious, and when the external calcium-sulfur ratio is 1.1-1.4, the optimal internal desulfurization ratio is about 20-43%.
Of course, the embodiment of the present application can also provide a desulfurization system applied to a circulating fluidized bed boiler,
the desulfurization system comprises an in-furnace desulfurization system and an out-furnace desulfurization system, wherein the out-furnace desulfurization system can be an out-furnace wet desulfurization system, an out-furnace semi-dry desulfurization system and the like, and the specific technical route of the out-furnace desulfurization system is not limited herein. It should be noted that, in the desulfurization system provided in the embodiment of the present application, the desulfurization ratio determination method inside and outside the furnace provided in the embodiment of the present application is used to determine the desulfurization ratio of each of the inside desulfurization and the outside desulfurization.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for determining the ratio of in-furnace desulfurization to out-furnace desulfurization of a circulating fluidized bed boiler is characterized by comprising the following steps:
under the same preset condition, determining multiple groups of data by adjusting the using amount of the in-furnace desulfurizing agent in unit time or the using amount of the out-furnace desulfurizing agent in unit time, wherein each group of data comprises the actual using amount of the in-furnace desulfurizing agent in unit time, the actual using amount of the out-furnace desulfurizing agent in unit time corresponding to the actual using amount of the in-furnace desulfurizing agent in unit time, the actual influence amount of the added in-furnace desulfurizing agent on the boiler efficiency and the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization;
calculating the unit electricity generation cost corresponding to each group of data according to the determined actual consumption of the in-furnace desulfurizer in unit time, the actual consumption of the out-furnace desulfurizer in unit time and the actual influence of the added in-furnace desulfurizer on the boiler efficiency in each group of data;
determining the lowest unit electric quantity power generation cost from unit electric quantity power generation costs respectively corresponding to each group of data;
and taking the actual distribution proportion of the in-furnace desulfurization and the out-furnace desulfurization in the data corresponding to the lowest unit electricity generation cost as the determined optimized proportion.
2. The method of claim 1, wherein calculating the unit electricity generation cost corresponding to each group of data according to the determined actual amount of the in-furnace desulfurizer per unit time, the actual amount of the out-furnace desulfurizer per unit time, and the actual influence of the added in-furnace desulfurizer on the boiler efficiency, specifically comprises:
calculating the cost of the desulfurizer in the unit generating capacity furnace corresponding to each group of data according to the price of the desulfurizer in the furnace and the actual consumption of the desulfurizer in the furnace in unit time in each group of data;
calculating the cost of the external desulfurizer per unit generating capacity respectively corresponding to each group of data according to the price of the external desulfurizer and the actual consumption of the external desulfurizer per unit time in each group of data;
calculating the boiler efficiency loss cost of unit power generation amount corresponding to each group of data according to the boiler efficiency when the in-boiler desulfurizer is not added and the actual influence quantity of the added in-boiler desulfurizer on the boiler efficiency in each group of data;
and calculating the unit electricity generation cost corresponding to each group of data according to the unit electricity generation amount in-furnace desulfurizer cost corresponding to each group of data, the unit electricity generation amount out-furnace desulfurizer cost corresponding to each group of data and the unit electricity generation amount boiler efficiency loss cost corresponding to each group of data.
3. The method of claim 2,
calculating the cost of the desulfurizer in the unit generating capacity furnace corresponding to each group of data according to the price of the desulfurizer in the furnace and the actual consumption of the desulfurizer in the furnace in unit time in each group of data, and specifically comprises the following steps:
respectively substituting the actual amount of the desulfurizer in the furnace and the price of the desulfurizer in the furnace in unit time in each group of data into a desulfurizer cost calculation formula in the furnace, and calculating the desulfurizer cost in the furnace in unit power generation amount corresponding to each group of data;
the formula for calculating the cost of the desulfurizing agent in the furnace specifically comprises the following steps:
wherein E isdes.inCalculating the cost of the desulfurizer in the unit generated energy furnace; q. q.sdes.inThe actual amount of the desulfurizer in the furnace in unit time is substituted; p is a radical ofdes.inThe price of the desulfurizer in the furnace; and P is the active power of the generator set.
4. The method of claim 2, wherein calculating the cost of the external desulfurizing agent per unit of generated energy according to the price of the external desulfurizing agent and the actual usage of the external desulfurizing agent per unit time in each group of data specifically comprises:
respectively substituting the actual amount of the external desulfurizer in unit time and the price of the external desulfurizer in each group of data into an external desulfurizer cost calculation formula, and calculating the external desulfurizer cost per unit generated energy corresponding to each group of data;
the formula for calculating the cost of the desulfurizing agent in the furnace specifically comprises the following steps:
wherein E isdes.outThe calculated cost of the desulfurizing agent outside the unit generated energy furnace; q. q.sdes.outThe actual amount of the desulfurizer outside the furnace in the unit time is substituted; p is a radical ofdes.outThe price of the desulfurizing agent outside the furnace; and P is the active power of the generator set.
5. The method of claim 2, wherein the step of calculating the boiler efficiency loss cost per unit power generation amount corresponding to each group of data according to the boiler efficiency when no in-boiler desulfurizing agent is added and the actual influence of the in-boiler desulfurizing agent added in each group of data on the boiler efficiency comprises the following steps:
respectively substituting the actual influence quantity of the added in-furnace desulfurizer on the boiler efficiency in each group of data, the boiler efficiency when the in-furnace desulfurizer is not added, the unit power generation coal consumption when the in-furnace desulfurizer is not added and the unit price of standard coal into a boiler efficiency loss cost calculation formula, and calculating the boiler efficiency loss cost of unit power generation corresponding to each group of data;
the formula for calculating the efficiency loss cost of the boiler specifically comprises the following steps:
wherein E' is the calculated boiler efficiency loss cost per unit generated energy; p is a radical offIs the unit price of the standard coal; bgPower generation coal consumption of unit without adding desulfurizing agent in furnace ηtThe boiler efficiency is delta η when no desulfurizing agent is added into the boilertThe added desulfurizing agent in the boiler has actual influence on the boiler efficiency.
6. The method according to claim 2, wherein calculating the power generation cost per unit electric quantity corresponding to each group of data according to the desulfurizing agent cost in the power generation unit furnace corresponding to each group of data, the desulfurizing agent cost outside the power generation unit furnace corresponding to each group of data, and the boiler efficiency loss cost per unit power generation corresponding to each group of data specifically comprises:
and summing up the desulfurizer cost in the unit generating capacity furnace, the desulfurizer cost outside the unit generating capacity furnace and the efficiency loss cost of the unit generating capacity boiler corresponding to each group of data respectively, and calculating the unit electric quantity power generation cost corresponding to each group of data respectively.
7. The method of claim 2, wherein each set of data further comprises the actual amount of the denitrifier in the furnace per unit time; then the process of the first step is carried out,
calculating the unit electricity generation cost corresponding to each group of data according to the unit electricity generation amount in-furnace desulfurizer cost corresponding to each group of data, the unit electricity generation amount out-furnace desulfurizer cost corresponding to each group of data and the unit electricity generation amount boiler efficiency loss cost corresponding to each group of data, specifically comprising:
respectively summing up the desulfurizer cost in the unit power generation furnace, the desulfurizer cost outside the unit power generation furnace, the boiler efficiency loss cost in the unit power generation and the denitrifier cost in the unit power generation furnace corresponding to each group of data, and calculating the unit power generation cost corresponding to each group of data;
the cost of the denitration agent in the furnace is calculated by substituting the actual amount of the denitration agent in the furnace in unit time in the corresponding data into a calculation formula of the cost of the denitration agent in the furnace;
the formula for calculating the cost of the denitrifier in the furnace specifically comprises the following steps:
wherein E isdenCalculating the cost of the denitrifier in the furnace for the unit generated energy; q. q.sdenThe actual amount of the denitration agent in the furnace in unit time is substituted; p is a radical ofdenThe price of the denitrifier in the furnace; and P is the active power of the generator set.
8. The method according to claim 1, wherein the same preset condition specifically comprises: the same active power of the generator set, the same content of the received base sulfur of the coal as fired and the same national emission standard.
9. A method for determining the ratio of in-furnace desulfurization to out-furnace desulfurization of a circulating fluidized bed boiler is characterized by comprising the following steps:
determining a corresponding relation function of the calcium-sulfur ratio in the furnace and the power generation cost of unit electric quantity under the preset boundary condition;
calculating the in-furnace calcium-sulfur ratio corresponding to the lowest unit electricity generation cost through the corresponding relation function;
and determining the optimal ratio of the in-furnace desulfurization to the out-furnace desulfurization under the preset boundary condition according to the in-furnace calcium-sulfur ratio corresponding to the lowest unit electricity generation cost.
10. A desulfurization system for a circulating fluidized bed boiler, characterized in that the desulfurization system adopts the method of any one of claims 1 to 9 to distribute the ratio of desulfurization inside and outside the boiler.
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