CN111027890A - Evaluation method for ultralow-emission desulfurization system of coal-fired unit - Google Patents
Evaluation method for ultralow-emission desulfurization system of coal-fired unit Download PDFInfo
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- CN111027890A CN111027890A CN201911362808.3A CN201911362808A CN111027890A CN 111027890 A CN111027890 A CN 111027890A CN 201911362808 A CN201911362808 A CN 201911362808A CN 111027890 A CN111027890 A CN 111027890A
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Abstract
The invention relates to an evaluation method of an ultralow-emission desulfurization system of a coal-fired unit, which comprises the following steps of: 1) acquiring unit load and inlet SO during operation of coal-fired unit2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2Concentration; 2) analysis of inlet SO2Concentration and outlet SO2Concentration, unit load and outlet SO2Concentration, unit load and desulfurization efficiency, slurry pH and outlet SO2The relationship between concentration, unit load and limestone consumption, unit load and process water consumption, and unit load and power consumption; analysis of the Total discharge SO2The reliability and stability of the concentration reaching the standard. The invention has the beneficial effects that: the invention originally provides a complete evaluation method of an ultralow-emission desulfurization system of a coal-fired unit, and realizes evaluation of the ultralow-emission desulfurization system of the coal-fired unit.
Description
Technical Field
The invention relates to the technical field of coal-fired desulfurization control, relates to an evaluation method for the running state and stability, and particularly relates to an evaluation method for the running state and stability of an ultralow-emission desulfurization system of a coal-fired unit.
Background
With the continuous promotion of the industrialization process and the continuous improvement of the environmental protection requirement, the deep emission reduction and the cooperative control technology of the atmospheric pollutants are continuously innovated, and the ultra-low emission becomes a hot spot of domestic research in recent years. In SO2In the aspect of removal, SO in China2Emission limit lower than American dayDeveloped countries and regions such as this become the most stringent standards in the world, and have put higher demands on the power industry and the desulfurization industry.
Follow-on energy sources [2014]2093 and other national/local ultra-low emission requirements, the development of desulfurization technology has stepped into the ultra-low emission stage. A series of SO (sulfur oxide) systems such as double-layer flow equalizing synergistic plates, pH zone control, single/double-tower double circulation, seawater desulfurization and the like are researched and developed in China2Ultra-low emission control technology and realization of engineering popularization and application. The continuous upgrading of the pollutant control standard drives the continuous upgrading of the technology and equipment, realizes the localization of the technology and equipment, and promotes the research and development process of the related technology.
However, the long-term operating conditions, stability, reliability and economy of the applied technology are relatively poorly studied. The detailed evaluation of the ultra-low emission limestone-gypsum wet desulphurization technology is not reported, so that the evaluation of the ultra-low emission desulphurization operation state and reliability of the flue gas of the coal-fired unit is very important.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an evaluation method of an ultralow-emission desulfurization system of a coal-fired unit.
The evaluation method of the ultra-low emission desulfurization system of the coal-fired unit comprises the following steps:
step 1, acquiring unit load and inlet SO during operation of coal-fired unit2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2Concentration; the material consumption comprises limestone consumption and process water consumption; the energy consumption comprises electricity consumption;
step 2, analyzing the inlet SO according to the related data obtained in the step 12Concentration and outlet SO2Concentration, unit load and outlet SO2Concentration, unit load and desulfurization efficiency, slurry pH and outlet SO2The relationship between concentration, unit load and limestone consumption, unit load and process water consumption, and unit load and power consumption; analysis of the Total discharge SO2The reliability and stability of the concentration reaching the standard.
Preferably, the inlet SO is analyzed2Concentration and outlet SO2Concentration correlation evaluation of desulfurizing tower to SO2The removal effect of (1);
by analysing unit load and outlet SO2Correlation relationship between concentrations, evaluation of outlet SO2Adaptability of concentration to unit load variation;
evaluating the adaptability of the desulfurization efficiency to the unit load by analyzing the correlation relationship between the unit load and the desulfurization efficiency;
by analyzing the pH of the slurry and the outlet SO2Correlation relationship of concentration, evaluation of slurry pH vs. desulfurization efficiency and outlet SO2The effect of concentration;
evaluating SO by analyzing the correlation relationship between unit load and limestone consumption2The effect of discharge rate on limestone consumption;
evaluating SO by analyzing the correlation relationship between unit load and process water consumption2The process water usage before and after the ultra-low emission implementation and under different unit loads;
evaluating SO by analyzing the correlation relationship between unit load and power consumption2The plant power rate after the ultra-low emission implementation;
by comparison of SO2Outlet SO before and after ultralow emission implementation2Concentration, evaluation of SO2The overall effect of ultra-low emissions;
through analyzing the main discharge port SO of the unit2The change of the concentration with time is evaluated to obtain the total discharge SO2The reliability and stability of the concentration reaching the standard.
Preferably, the unit load, inlet SO, during operation of the coal-fired unit2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2The concentration is obtained from an automatic flue gas monitoring system; the running time of the automatic flue gas monitoring system is 2 months, and the interval time for acquiring data from the automatic flue gas monitoring system is the same.
Preferably, the interval time for acquiring the data from the automatic flue gas monitoring system is 30 min.
Preferably, the load of the unit and the inlet SO are taken during data processing2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2The concentrations are converted into dry basis and 6 percent of O2Data in the state.
Preferably, the related online instruments of the automatic smoke monitoring system are calibrated before data acquisition begins.
Preferably, the slurry pH ranges from: 5.0 to 5.8; and if the pH value of the slurry exceeds the range of 5.0-5.8, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard.
Preferably, the SO2After the ultra-low emission is implemented, the average value range of the desulfurization efficiency is as follows: greater than 98%; and if the average value of the desulfurization efficiency is less than or equal to 98%, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard.
Preferably, the main discharge SO2The concentration standard-reaching rate range is as follows: greater than or equal to 99%; if total discharge SO2And if the standard reaching rate of the concentration is less than 99%, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard.
The invention has the beneficial effects that: the invention originally provides a complete evaluation method of an ultralow-emission desulfurization system of a coal-fired unit, and realizes evaluation of the ultralow-emission desulfurization system of the coal-fired unit.
Drawings
FIG. 1 is a flow chart of a method for evaluating an ultra-low emission desulfurization system of a coal-fired unit;
FIG. 2 shows inlet and outlet SO2A graph of concentration relationship;
FIG. 3 shows inlet SO at different loads2Concentration and outlet SO2A graph of concentration dependence;
FIG. 4 shows the unit load and the outlet SO2A graph of concentration relationship;
FIG. 5 is a graph showing the relationship between unit load and desulfurization efficiency;
FIG. 6 shows slurry pH and outlet SO2A graph of concentration relationship;
FIG. 7 shows a main exhaust SO of the unit2Concentration profileFigure (a).
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
In order to evaluate the running state and stability of the coal-fired unit after the ultra-low emission technology is applied and solve the problem of evaluation of the ultra-low emission desulfurization performance of the coal-fired unit, the invention provides an ultra-low emission performance evaluation method of the coal-fired unit, which can realize evaluation of the running state and stability of an ultra-low emission desulfurization system.
The method for evaluating the ultra-low emission desulfurization system of the coal-fired unit is shown in a flow chart of fig. 1 and comprises the following steps:
step 1, acquiring unit load and inlet SO during operation of coal-fired unit2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2Concentration; the material consumption comprises limestone consumption and process water consumption; the energy consumption comprises electricity consumption;
the data are obtained from an automatic flue gas monitoring system; the running time of the automatic flue gas monitoring system is 2 months continuously, and the interval time for acquiring data from the automatic flue gas monitoring system is the same; the interval time for acquiring data from the automatic flue gas monitoring system is 30 min;
load of the machine set and inlet SO taken during data processing2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2The concentrations are converted into dry basis and 6 percent of O2Data under state;
the related online instruments of the automatic flue gas monitoring system are calibrated before data acquisition begins
Step 2, evaluating the ultra-low emission desulfurization system by analyzing the inlet SO according to the related data obtained in the step 12Concentration and outlet SO2Concentration, unit load and outlet SO2Concentration, unit load and desulfurization efficiency, slurry pH and outlet SO2The relationship between concentration, unit load and limestone consumption, unit load and process water consumption, and unit load and power consumption is calculated according to the total SO discharge2The reliability and stability of the concentration reaching standard.
By analysing the inlet SO2Concentration and outlet SO2Concentration correlation evaluation of desulfurizing tower to SO2The removal effect of (1);
FIG. 2 shows inlet and outlet SO2A concentration relation chart showing SO in raw flue gas along with the inlet of the desulfurizing tower2Increase in concentration, SO in the outlet clean flue gas2The concentration rises slowly and SO is discharged from the desulfurizing tower2Concentration and inlet SO2The concentration has a certain linear trend.
By analysing unit load and outlet SO2Correlation relationship between concentrations, evaluation of outlet SO2Adaptability of concentration to unit load variation;
FIG. 3 shows inlet SO at different loads2Concentration and outlet SO2A graph of concentration dependence; FIG. 4 shows the unit load and the outlet SO2A concentration relation chart, wherein the chart shows that the SO at the outlet of the desulfurizing tower increases along with the increase of the unit load2The concentration is slightly increased;
evaluating the adaptability of the desulfurization efficiency to the unit load by analyzing the correlation relationship between the unit load and the desulfurization efficiency; FIG. 5 is a graph of unit load versus desulfurization efficiency showing a slight increase in desulfurization efficiency as unit load increases;
by analyzing the pH of the slurry and the outlet SO2Correlation relationship of concentration, evaluation of slurry pH vs. desulfurization efficiency and outlet SO2The effect of concentration; the slurry pH ranges: 5.0 to 5.8; if the pH value of the slurry exceeds the range of 5.0-5.8, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard;
FIG. 6 shows slurry pH and outlet SO2The concentration relation graph shows that the desulfurization system has better reliability on the pH value of the slurry after ultralow-emission modification, and as the pH value of the slurry rises,outlet SO2The concentration is reduced;
evaluating SO by analyzing the correlation relationship between unit load and limestone consumption2The effect of discharge rate on limestone consumption; calculated, the SO at the inlet of the desulfurizing tower2The larger the discharge rate is, the larger the limestone consumption of the desulfurizing tower is;
evaluating SO by analyzing the correlation relationship between unit load and process water consumption2The process water usage before and after the ultra-low emission implementation and under different unit loads;
evaluating SO by analyzing the correlation relationship between unit load and power consumption2The plant power rate after the ultra-low emission implementation;
by comparison of SO2Outlet SO before and after ultralow emission implementation2Concentration, evaluation of SO2The overall effect of ultra-low emissions; through calculation, the unit SO2After the ultra-low emission is implemented, the average desulfurization efficiency is more than 98 percent; if the average value of the desulfurization efficiency is less than or equal to 98%, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard;
through analyzing the main discharge port SO of the unit2The change of the concentration with time is evaluated to obtain the total discharge SO2The reliability and stability of the concentration reaching the standard; the general discharge port SO2The concentration standard-reaching rate range is as follows: greater than or equal to 99%; if total discharge SO2The standard reaching rate of the concentration is less than 99 percent, and the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard; FIG. 7 shows a main discharge SO of the unit2Concentration change, the main discharge port SO of the unit2The standard reaching rate of the concentration is 99.59 percent.
Claims (9)
1. A coal-fired unit ultra-low emission desulfurization system evaluation method is characterized by comprising the following steps:
step 1, acquiring unit load and inlet SO during operation of coal-fired unit2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2Concentration; the material consumption comprises limestone consumption and process water consumption; the energy consumption comprises electricity consumption;
step 2, obtaining according to step 1Obtaining relevant data, analyzing inlet SO2Concentration and outlet SO2Concentration, unit load and outlet SO2Concentration, unit load and desulfurization efficiency, slurry pH and outlet SO2The relationship between concentration, unit load and limestone consumption, unit load and process water consumption, and unit load and power consumption; analysis of the Total discharge SO2The reliability and stability of the concentration reaching the standard.
2. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 1, characterized in that: by analysing the inlet SO2Concentration and outlet SO2Concentration correlation evaluation of desulfurizing tower to SO2The removal effect of (1);
by analysing unit load and outlet SO2Correlation relationship between concentrations, evaluation of outlet SO2Adaptability of concentration to unit load variation;
evaluating the adaptability of the desulfurization efficiency to the unit load by analyzing the correlation relationship between the unit load and the desulfurization efficiency;
by analyzing the pH of the slurry and the outlet SO2Correlation relationship of concentration, evaluation of slurry pH vs. desulfurization efficiency and outlet SO2The effect of concentration;
evaluating SO by analyzing the correlation relationship between unit load and limestone consumption2The effect of discharge rate on limestone consumption;
evaluating SO by analyzing the correlation relationship between unit load and process water consumption2The process water usage before and after the ultra-low emission implementation and under different unit loads;
evaluating SO by analyzing the correlation relationship between unit load and power consumption2The plant power rate after the ultra-low emission implementation;
by comparison of SO2Outlet SO before and after ultralow emission implementation2Concentration, evaluation of SO2The overall effect of ultra-low emissions;
through analyzing the main discharge port SO of the unit2The change of the concentration with time is evaluated to obtain the total discharge SO2The reliability and stability of the concentration reaching the standard.
3. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 1, characterized in that: unit load, inlet SO during operation of the coal-fired unit2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2The concentration is obtained from an automatic flue gas monitoring system; the running time of the automatic flue gas monitoring system is 2 months, and the interval time for acquiring data from the automatic flue gas monitoring system is the same.
4. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 3, characterized in that: the interval time for acquiring data from the automatic flue gas monitoring system is 30 min.
5. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 1, characterized in that: load of the machine set and inlet SO taken during data processing2Concentration, outlet SO2Concentration, desulfurization efficiency, slurry pH, material consumption, energy consumption and total discharge SO2The concentrations are converted into dry basis and 6 percent of O2Data in the state.
6. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 1, characterized in that: the related online instruments of the automatic smoke monitoring system are calibrated before data acquisition begins.
7. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 2, characterized in that: the slurry pH ranges: 5.0 to 5.8; and if the pH value of the slurry exceeds the range of 5.0-5.8, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard.
8. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 2, characterized in that: the SO2The desulfurization efficiency is flat after the ultra-low emission is implementedThe mean range is: greater than 98%; and if the average value of the desulfurization efficiency is less than or equal to 98%, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard.
9. The evaluation method for the ultra-low emission desulfurization system of the coal-fired unit according to claim 2, characterized in that: the general discharge port SO2The concentration standard-reaching rate range is as follows: greater than or equal to 99%; if total discharge SO2And if the standard reaching rate of the concentration is less than 99%, the ultra-low emission desulfurization system of the coal-fired unit does not reach the standard.
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| CN106474895A (en) * | 2016-12-29 | 2017-03-08 | 苏跃进 | A kind of method and device of deep removal sulfureous in flue gas oxide |
| CN106955580A (en) * | 2017-04-13 | 2017-07-18 | 广东电网有限责任公司电力科学研究院 | A kind of low key reason detection method of thermal power plant's lime stone-wet desulphurization efficiency |
| CN109472406A (en) * | 2018-11-02 | 2019-03-15 | 浙江大学 | A kind of global optimization method of minimum discharge multi-pollutant cooperation-removal system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106474895A (en) * | 2016-12-29 | 2017-03-08 | 苏跃进 | A kind of method and device of deep removal sulfureous in flue gas oxide |
| CN106955580A (en) * | 2017-04-13 | 2017-07-18 | 广东电网有限责任公司电力科学研究院 | A kind of low key reason detection method of thermal power plant's lime stone-wet desulphurization efficiency |
| CN109472406A (en) * | 2018-11-02 | 2019-03-15 | 浙江大学 | A kind of global optimization method of minimum discharge multi-pollutant cooperation-removal system |
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