CN110898637A - Preparation process of coal-fired boiler flue gas desulfurization efficiency calculation method - Google Patents
Preparation process of coal-fired boiler flue gas desulfurization efficiency calculation method Download PDFInfo
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- CN110898637A CN110898637A CN201911154188.4A CN201911154188A CN110898637A CN 110898637 A CN110898637 A CN 110898637A CN 201911154188 A CN201911154188 A CN 201911154188A CN 110898637 A CN110898637 A CN 110898637A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/02—Other waste gases
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Abstract
The invention relates to a method for calculating flue gas desulfurization efficiency of a coal-fired boiler, which comprises the steps of firstly setting measuring points, secondly measuring the dynamic pressure and the static pressure of flue gas at the positions of the measuring points, then measuring the temperature of the flue gas at the positions of the measuring points, and then measuring SO2Converting the content, calculating the flue gas flow velocity of each measuring point according to dynamic pressure, static pressure and temperature, and obtaining SO by weighting calculation2And finally calculating the desulfurization efficiency according to the average value of the contents. The invention considers the influence of the position flow of each measuring point in the flue and uses SO2The average value of the content weighted according to the flow replaces the arithmetic average value in the original method, reduces the error caused by the uneven distribution of the flue gas in the flue, ensures that the calculation result is more accurate, and can better reflect the actual desulfurization effect of the desulfurization device of the coal-fired boiler.
Description
Technical Field
The invention belongs to the technical field of coal-fired boilers, and particularly relates to a preparation process of a method for calculating flue gas desulfurization efficiency of a coal-fired boiler.
Background
In recent years, the air pollution problem in China is serious, coal-fired boilers are used as one of main air pollution sources, and the emission condition of smoke is controlled more and more strictly. For coal-fired boilers, SO2Is one of the main pollutants, and the flue gas desulfurization efficiency is an important index for evaluating desulfurization equipment of a coal-fired boiler. The flue gas desulfurization efficiency of the existing coal-fired boiler is generally determined by a test mode, and the method comprises the following general steps: firstly, measuring points are arranged on an inlet flue and an outlet flue of a desulfurization device by using a grid method; then O is carried out at each measuring point position of the flue at the inlet and the flue at the outlet of the desulfurization device2、SO2Measuring the content; then measuring the static pressure and temperature of the flue gas at each measuring point of the inlet flue and the outlet flue of the desulfurization device; then adding SO2Converting the content to a standard state and under the state that the excess air coefficient is 1.4; recalculating SO at the inlet flue of the desulfurization device2Average content and SO in flue at outlet of desulfurizing unit2Average content value; finally according to the inlet flue gas SO of the desulphurization device2Content average and outlet flue gas SO2Content (wt.)And calculating the desulfurization efficiency of the desulfurization device by the average value. In practical use, the calculation method has the defect that the distribution of flue gas in a flue is uneven, the flow of the flue gas at each measuring point is different, particularly, the internal structure of the desulfurization device is complex, the flue gas at the outlet of the desulfurization device is more uneven, and SO is directly used2The calculation of the desulfurization efficiency using the arithmetic mean of the contents has a large error.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for using SO by considering the influence of the position flow of each measuring point in a flue2The average value of the content weighted according to the flow replaces the arithmetic average value in the original method, reduces the error caused by the uneven distribution of the flue gas in the flue, and ensures that the calculation result is more accurate.
The invention adopts the following specific technical scheme:
a coal-fired boiler flue gas desulfurization efficiency calculation method is characterized by comprising the following steps: the method comprises the following steps:
⑴ setting measuring points at the inlet flue and the outlet flue of the flue gas desulfurization device by using a moving grid method;
⑵, measuring the dynamic pressure and static pressure of the flue gas at each measuring point of the inlet flue and the outlet flue of the desulfurization device by using a flue gas analyzer;
⑶ measuring the flue gas temperature at each measuring point of the inlet flue and the outlet flue of the desulfurization device by using a thermocouple;
⑷ SO at each measuring point of inlet flue and outlet flue of desulfurizer2Converting the content to a standard state and under the state that the excess air coefficient is 1.4;
⑸ calculating the flue gas flow velocity of each measuring point position according to the dynamic pressure and static pressure of step ⑵ and the temperature of step ⑶;
⑹ SO at each measuring point of inlet flue and outlet flue of desulfurization device2The content is weighted and calculated according to the flow velocity of the flue gas to obtain SO in the inlet flue gas and the outlet flue gas2In an amount ofMean value;
⑺ calculating the desulfurization efficiency based on the calculation of step ⑹.
In addition, the standard brick state in step ⑷ is at 273K and 101325 Pa.
Further, the SO of step ⑷2The calculation formula used for content conversion is as follows:
wherein: SO (SO)2-measuring SO in flue gas2The content is in mg/m3；
SO2cvConverting to SO in the flue gas under the standard state and the excess air coefficient of 1.42The content is in mg/Nm3；
O2-in flue gas O2Content, in%;
t-the flue gas temperature at the corresponding measuring point, and the unit is;
pj-the static pressure of the flue gas at the corresponding measurement in Pa.
paAtmospheric pressure in Pa.
Further, the calculation formula of the flue gas flow rate in step ⑸ is as follows:
wherein: v. ofi-the flue gas flow velocity at the corresponding measurement point, in m/s;
Kd-pitot tube calibration coefficients;
delta p is the dynamic pressure of the flue gas at the corresponding measuring point, and the unit is Pa;
rho-density of flue gas in kg/m3。
Furthermore, the calculation formula of ρ is:
further, the formula of the weighting calculation in step ⑹ is:
further, the calculation formula of the desulfurization efficiency in step ⑺ is:
the invention has the advantages and beneficial effects that:
in the invention, firstly measuring points are arranged, then the dynamic pressure and the static pressure of the flue gas at the positions of the measuring points are measured, then the temperature of the flue gas at the positions of the measuring points is measured, and then SO is used for measuring2Converting the content, calculating the flue gas flow velocity of each measuring point according to dynamic pressure, static pressure and temperature, and obtaining SO by weighting calculation2And finally calculating the desulfurization efficiency according to the average value of the contents. The invention considers the influence of the position flow of each measuring point in the flue and uses SO2The average value of the content weighted according to the flow replaces the arithmetic average value in the original method, reduces the error caused by the uneven distribution of the flue gas in the flue, ensures that the calculation result is more accurate, and can better reflect the actual desulfurization effect of the desulfurization device of the coal-fired boiler.
Detailed Description
The present invention is further described in the following examples, but the technical content described in the examples is illustrative and not restrictive, and the scope of the present invention should not be limited thereby.
The invention discloses a method for calculating the flue gas desulfurization efficiency of a coal-fired boiler, which is characterized by comprising the following steps of: the method comprises the following steps:
⑴ setting measuring points at the inlet flue and the outlet flue of the flue gas desulfurization device by using a moving grid method;
⑵, measuring the dynamic pressure and static pressure of the flue gas at each measuring point of the inlet flue and the outlet flue of the desulfurization device by using a flue gas analyzer;
⑶ measuring the flue gas temperature at each measuring point of the inlet flue and the outlet flue of the desulfurization device by using a thermocouple;
⑷ SO at each measuring point of inlet flue and outlet flue of desulfurizer2Converting the content to a standard state and under the state that the excess air coefficient is 1.4;
⑸ calculating the flue gas flow velocity of each measuring point position according to the dynamic pressure and static pressure of step ⑵ and the temperature of step ⑶;
⑹ SO at each measuring point of inlet flue and outlet flue of desulfurization device2The content is weighted and calculated according to the flow velocity of the flue gas to obtain SO in the inlet flue gas and the outlet flue gas2The average value of the contents;
⑺ calculating the desulfurization efficiency based on the calculation of step ⑹.
In the above steps, the standard brick state in step ⑷ is that the temperature is 273K and the pressure is 101325 Pa.
SO of step ⑷2The calculation formula used for content conversion is as follows:
wherein: SO (SO)2-measuring SO in flue gas2The content is in mg/m3；
SO2cvConverting to SO in the flue gas under the standard state and the excess air coefficient of 1.42The content is in mg/Nm3；
O2-in flue gas O2Content, in%;
t-the flue gas temperature at the corresponding measuring point, and the unit is;
pj-the static pressure of the flue gas at the corresponding measurement in Pa.
paAtmospheric pressure in Pa.
The calculation formula of the flue gas flow rate in the step ⑸ is as follows:
wherein: v. ofi-the flue gas flow velocity at the corresponding measurement point, in m/s;
Kd-pitot tube calibration coefficients;
delta p is the dynamic pressure of the flue gas at the corresponding measuring point, and the unit is Pa;
rho-density of flue gas in kg/m3。
The calculation formula of rho is as follows:
the formula for the weighting calculation in step ⑹ is:
the calculation formula of the desulfurization efficiency in step ⑺ is:
in the invention, firstly measuring points are arranged, then the dynamic pressure and the static pressure of the flue gas at the positions of the measuring points are measured, then the temperature of the flue gas at the positions of the measuring points is measured, and then SO is used for measuring2Converting the content, calculating the flue gas flow velocity of each measuring point according to dynamic pressure, static pressure and temperature, and obtaining SO by weighting calculation2And finally calculating the desulfurization efficiency according to the average value of the contents. The invention considers the influence of the position flow of each measuring point in the flue and uses SO2The average value of the content weighted according to the flow replaces the arithmetic average value in the original method, reduces the error caused by the uneven distribution of the flue gas in the flue, ensures that the calculation result is more accurate, and can better reflect the actual desulfurization effect of the desulfurization device of the coal-fired boiler.
Claims (7)
1. A coal-fired boiler flue gas desulfurization efficiency calculation method is characterized by comprising the following steps: the method comprises the following steps:
⑴ setting measuring points at the inlet flue and the outlet flue of the flue gas desulfurization device by using a moving grid method;
⑵, measuring the dynamic pressure and static pressure of the flue gas at each measuring point of the inlet flue and the outlet flue of the desulfurization device by using a flue gas analyzer;
⑶ measuring the flue gas temperature at each measuring point of the inlet flue and the outlet flue of the desulfurization device by using a thermocouple;
⑷ SO at each measuring point of inlet flue and outlet flue of desulfurizer2Converting the content to a standard state and under the state that the excess air coefficient is 1.4;
⑸ calculating the flue gas flow velocity of each measuring point position according to the dynamic pressure and static pressure of step ⑵ and the temperature of step ⑶;
⑹ SO at each measuring point of inlet flue and outlet flue of desulfurization device2The content is weighted and calculated according to the flow velocity of the flue gas to obtain SO in the inlet flue gas and the outlet flue gas2The average value of the contents;
⑺ calculating the desulfurization efficiency based on the calculation of step ⑹.
2. The method for calculating the flue gas desulfurization efficiency of the coal-fired boiler according to claim 1, wherein the standard brick state in step ⑷ is that the temperature is 273K and the pressure is 101325 Pa.
3. The method for calculating the flue gas desulfurization efficiency of a coal-fired boiler according to claim 1, wherein the SO in step ⑷2The calculation formula used for content conversion is as follows:
wherein: SO (SO)2-measuring SO in flue gas2The content is in mg/m3；
SO2cvConverting to SO in the flue gas under the standard state and the excess air coefficient of 1.42The content is in mg/Nm3；
O2-in flue gas O2Content, in%;
t-the flue gas temperature at the corresponding measuring point, and the unit is;
pj-the static pressure of the flue gas at the corresponding measurement in Pa.
paAtmospheric pressure in Pa.
4. The method for calculating the flue gas desulfurization efficiency of the coal-fired boiler according to claim 1, wherein the calculation formula of the flue gas flow velocity in the step ⑸ is as follows:
wherein: v. ofi-the flue gas flow velocity at the corresponding measurement point, in m/s;
Kd-pitot tube calibration coefficients;
delta p is the dynamic pressure of the flue gas at the corresponding measuring point, and the unit is Pa;
rho-density of flue gas in kg/m3。
5. The method for calculating the flue gas desulfurization efficiency of the coal-fired boiler according to claim 4, characterized in that: the calculation formula of the rho is as follows:
6. the method for calculating the flue gas desulfurization efficiency of the coal-fired boiler according to claim 1, wherein the formula of the weighted calculation in the step ⑹ is as follows:
7. the method for calculating the flue gas desulfurization efficiency of the coal-fired boiler according to claim 1, wherein the calculation formula of the desulfurization efficiency in the step ⑺ is as follows:
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Cited By (2)
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| CN111539160A (en) * | 2020-04-14 | 2020-08-14 | 龙净科杰环保技术（上海）有限公司 | Method for calculating flow velocity of ammonia injection pipeline of urea denitration system of coal-fired unit |
| CN113064346A (en) * | 2021-02-03 | 2021-07-02 | 华能国际电力股份有限公司营口电厂 | Intelligent optimization control method for wet desulphurization oxidation fan system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111539160A (en) * | 2020-04-14 | 2020-08-14 | 龙净科杰环保技术（上海）有限公司 | Method for calculating flow velocity of ammonia injection pipeline of urea denitration system of coal-fired unit |
| CN111539160B (en) * | 2020-04-14 | 2022-10-04 | 龙净科杰环保技术（上海）有限公司 | Method for calculating flow velocity of ammonia injection pipeline of urea denitration system of coal-fired unit |
| CN113064346A (en) * | 2021-02-03 | 2021-07-02 | 华能国际电力股份有限公司营口电厂 | Intelligent optimization control method for wet desulphurization oxidation fan system |
| CN113064346B (en) * | 2021-02-03 | 2023-05-30 | 华能国际电力股份有限公司营口电厂 | Intelligent optimization control method for wet desulfurization oxidation fan system |
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