CN103157360A - Dynamic timely-response control method for SO2 concentration of sintering flue gas - Google Patents
Dynamic timely-response control method for SO2 concentration of sintering flue gas Download PDFInfo
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- CN103157360A CN103157360A CN 201110407362 CN201110407362A CN103157360A CN 103157360 A CN103157360 A CN 103157360A CN 201110407362 CN201110407362 CN 201110407362 CN 201110407362 A CN201110407362 A CN 201110407362A CN 103157360 A CN103157360 A CN 103157360A
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Abstract
The invention discloses a dynamic timely-response control method for the SO2 concentration of a sintering flue gas. The dynamic timely-response control method comprises the following steps of: measuring the temperature, flow rate, pressure and particle solubility of the flue gas before the flue gas enters in a desulfurization tower; and timely responding via the easily-measured quantities of temperature, flow rate, pressure and particle solubility to fit out the SO2 concentration of the sintering flue gas. The sintering flue gas is extremely instable in working condition, and low desulfurization efficiency and no substandard release of the flue gas are certainly caused by directly measuring the SO2 concentration of the sintering flue gas to control the running of the desulfurization device. The method has the characteristics of being high in accuracy, simple in equipment, convenient to operate, and the like.
Description
Technical field
The present invention relates to the air pollution control technique field, specifically sinter fume SO
2The dynamically in good time response control mehtod of concentration.
Background technology
Contain a large amount of SO in sintering device flue gas
2, control SO
2Discharge capacity be the emphasis of Environmental Protection in China.The sinter fume changes in flow rate is large, and amplitude can reach 40% left and right; SO
2Concentration is low and change greatly general SO
2Concentration range is between 400-3000mg/Nm3; Variations in temperature is large, generally at 85-150 ℃.Therefore, the sinter fume operating mode is extremely unstable.Traditional wet method sintering flue gas desulfurization process is following two kinds of hairdos usually:
A, control the quantity delivered of desulfurizing agent by the doctor solution pH value.This control mode is only applicable to the flue gas desulfurization of operating mode stabilizer pole, uses on operating mode and unsettled sinter fume as this single control mode, must cause the waste of the low and resource of desulfuration efficiency, causes the increase of desulphurization cost.
B, pass through SO
2Concentration PID controls the quantity delivered of desulfurizing agent.This control mode is in theory on applicable sintered flue gas desulfurization device, but SO
2Measurement of concetration generally has certain hysteresis quality, even applicable PID control technology also is difficult to the instant SO of tracking
2The variation of concentration, must cause the low of desulfuration efficiency, cause the not qualified discharge of flue gas.
For the features of sinter fume, need a kind of intellectuality, respond fast sinter fume SO
2Concentration detection system is controlled the stable operation of desulfurizer.Present technique is utilized the correlation of sinter fume, during a kind of working conditions change, other operating mode also changes.This system employs SO
2Concentration performance matching technology, the performance matching such as the temperature by flue, flow, pressure, granule density goes out SO
2Concentration,, by analysis after timely output control command, and then the running status of effectively regulating desulfurizer is complementary operational factor and the flue gas operating mode of each unit such as air-introduced machine, oxidation compression fan, desulfurizing agent pump, slurry circulating pump, flue gas heat exchanger.
Summary of the invention
Sinter fume SO
2Concentration, temperature, pressure, flow and granule density have correlation, have contact between five factors, and a variable can be along with another variable change.Therefore can utilize that between them, the correlation performance matching goes out one of them amount, namely temperature (T (t)), pressure (P (t)), flow (F (t)) and granule density (PC (t)) simulate SO
2Concentration (S (t)).
S(t)≈C
11T(t)+C
12P(t)+C
13F(t)+C
14PC(t)+C
21T2(t)+
C22P
2(t)+C
23F
2(t)+C
24PC
2(t)+C
31T
3(t)+C
32P
3(t)+C
33F
3(t)+C
34PC
3(t)+……
Each coefficient of How to choose Cji makes error minimum between S (t) and approximate function, and namely mean square error is:
Wherein (t1, t2) is the time interval of performance matching,
Be temperature (T (t)), pressure (P (t)), flow (F (t)) and granule density (PC (t)), minimum for making following formula:
All obtain coefficient:
Select suitable coefficient C
jiNamely can be SO
2Concentration dynamically in good time the response match out, coefficient C
jiIt is general relevant with sintering process with sintering deposit,
The unit interval discretization
System temperature temperature (T (t)), pressure (P (t)), flow (F (t)) and granule density (PC (t)) per second kind are got once numeral, obtain discretization data temperature (T (K)), pressure (P (K)), flow (F (K)) and granule density (PC (K).
S(K)≈C
11T(K)+C
12P(K)+C
13F(K)+C
14PC(K)+C
21T
2(K)+C
22P
2(K)+C
23F
2(K)+C
24PC
2(K)+C
31T
3(K)+C
32P
3(K)+C
33F
3(K)+C
34PC
3(K)+……
Based on can only using in the not high occasion of precision of discretization, therefore change into percentage.
(PC (K) obtains separately percentage temperature (T (n)), pressure (P (n)), flow (F (n)) and granule density (PC (n) divided by separately maximum amount for temperature (T (K)), pressure (P (K)), flow (F (K)) and granule density.
S(n)≈C
11T(n)+C
12P(n)+C
13F(n)+C
14PC(n)+C
21T
2(n)+C
22P
2(n)+C
23F
2(n)+C
24PC
2(n)+C
31T
3(n)+C
32P
3(n)+C
33F
3(n)+C
34PC
3(n)+……
Measure temperature (T (K)), pressure (P (K)), flow (F (K)) and granule density (PC (K) calculates Cji and gets final product from the scene.
Show according to the Ba Saiwaer formula: obtained item number is more, and namely n is larger, and error is less.When n → ∞ time error is zero.Can get according to practical experience and generally get 3 powers.
Description of drawings
Nothing
The specific embodiment
System Implementation comprises the measurement of flue gas flow, the measurement of flue-gas temperature, the measurement of flue gas pressures, the measurement of granule density, with the value performance matching SO that measures
2Concentration.Data collecting system is by the sampling rate of selected data acquisition front equipment, the periodically analog quantity information of acquisition and processing field apparatus and technique.And show in the host computer display screen by Internet Transmission, as the foundation of operations staff's supervision and operation site equipment.
Flow adopts pitot tube method.The sinter fume that namely flows in pipeline is subject to the effect of two kinds of pressure, i.e. static pressure and dynamic pressure simultaneously.Because the flow velocity of gas is directly proportional to the square root of the dynamic pressure of gas, therefore can be according to the flow velocity of the dynamic pressure calculation gas that records.
The characteristic that flue-gas temperature utilizes platinum resistance thermometer sensor, to change with temperature is measured the sinter fume temperature, and granule density adopts the optical flare method to measure, and can obtain measuring concentration of granules in certain value in flue gas by the flicker amplitude of measuring light.
Data collecting system is according to collection in 1 second speed once, periodically from the above-mentioned data volume of collection in worksite.Be transferred to central controller by data wire.
Wherein number of times is got 3 powers, and fitting coefficient is got C11=0.35, C12=0.2, C13=0.23, C14=0.36, C21=0.12, C22=0.11, C23=0.09, C24=0.08, C31=0.03, C32=0.01, C33=0.009, C34=0.007.
Claims (3)
1. the dynamically in good time response control mehtod of sinter fume SO2 concentration, is characterized in that: adopt temperature, flow, pressure, the response in good time of particle solubility of sinter fume to simulate SO
2Concentration.
2. sinter fume described according to claim feature 1 is characterized in that:
(1) exhaust gas volumn is large, and 1 ton of sintering deposit produces 4000～6000m
3Flue gas;
(2) SO
2Solubility changes greatly, and scope is at 400～5000mg/Nm
3Between;
(3) variations in temperature is large, is generally 80 ℃～180 ℃;
(4) flue gas flow changes greatly, and amplitude of variation is up to more than 40%;
(5) moisture is large and unstable, is generally 10～13%;
(6) oxygen content is high, is generally 15%～18%;
(7) grain dust is many and have viscosity.
3. dynamically in good time response described according to claim feature 1 simulates SO
2Concentration comprises the following steps:
(1) measure the value of temperature, flow, pressure, particle solubility;
(2) maximum according to temperature, flow, pressure, particle solubility draws variation percentage;
(3) the variation percentage according to temperature, flow, pressure, particle solubility simulates SO
2Concentration;
It is characterized in that:
(1) adopt Pitot tube to measure the variation of sinter fume flow;
(2) adopt absolute pressure to become and send the variation of measuring flue gas pressures;
(3) characteristic that adopts platinum resistance thermometer sensor, to change with temperature is come the measurement gas temperature;
(4) adopt the optical flare method to measure the particle concentration of flue gas;
(5) maximum of measured sinter fume temperature, flow, pressure, particle solubility under the constant condition of sinter fume technological process;
(6) utilize the variation percentage response in good time of temperature, flow, pressure, particle solubility to simulate SO
2Change in concentration percentage, thus draw SO
2Concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110407362 CN103157360A (en) | 2011-12-08 | 2011-12-08 | Dynamic timely-response control method for SO2 concentration of sintering flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110407362 CN103157360A (en) | 2011-12-08 | 2011-12-08 | Dynamic timely-response control method for SO2 concentration of sintering flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103157360A true CN103157360A (en) | 2013-06-19 |
Family
ID=48581201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110407362 Pending CN103157360A (en) | 2011-12-08 | 2011-12-08 | Dynamic timely-response control method for SO2 concentration of sintering flue gas |
Country Status (1)
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472873A (en) * | 2013-09-10 | 2013-12-25 | 盐城工学院 | Control method and system used in sintering flue gas desulfurizer |
| WO2022105899A1 (en) * | 2020-11-21 | 2022-05-27 | 山东鸣川汽车集团有限公司 | Sensing device |
-
2011
- 2011-12-08 CN CN 201110407362 patent/CN103157360A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472873A (en) * | 2013-09-10 | 2013-12-25 | 盐城工学院 | Control method and system used in sintering flue gas desulfurizer |
| CN103472873B (en) * | 2013-09-10 | 2016-02-10 | 盐城工学院 | The control method that a kind of sintered flue gas desulfurization device uses and system |
| WO2022105899A1 (en) * | 2020-11-21 | 2022-05-27 | 山东鸣川汽车集团有限公司 | Sensing device |
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| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130619 |