CN203501822U - Semi-closed iron alloy submerged arc furnace smoke temperature monitoring device - Google Patents
Semi-closed iron alloy submerged arc furnace smoke temperature monitoring device Download PDFInfo
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- CN203501822U CN203501822U CN201320641312.1U CN201320641312U CN203501822U CN 203501822 U CN203501822 U CN 203501822U CN 201320641312 U CN201320641312 U CN 201320641312U CN 203501822 U CN203501822 U CN 203501822U
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- flue
- processor
- temperature
- gas temperature
- semiclosed
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- 239000000779 smoke Substances 0.000 title claims abstract description 16
- 229910000640 Fe alloy Inorganic materials 0.000 title abstract 4
- 238000012806 monitoring device Methods 0.000 title abstract 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 33
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 239000000523 sample Substances 0.000 claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 86
- 239000003546 flue gas Substances 0.000 claims description 84
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 29
- 238000005259 measurement Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 6
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 description 12
- 239000011707 mineral Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000003517 fume Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000003786 synthesis reaction Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 229910018619 Si-Fe Inorganic materials 0.000 description 2
- 229910008289 Si—Fe Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Vertical, Hearth, Or Arc Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The utility model discloses a semi-closed iron alloy submerged arc furnace smoke temperature monitoring device which comprises a processor. The processor is connected with an oxygen content sensor through an oxygen content analyzer. A probe of the oxygen content sensor is inserted into a semi-closed iron alloy submerged arc furnace smoke duct or a smoke exhaust barrel. The processor controls the opening degree of a semi-closed iron alloy submerged arc furnace door or a smoke duct wild air valve gate through a drive relay. The monitoring device is high in sensitivity and capable of preventing the occurrence of the phenomenon that system elements, especially dust removing bags are burned in large area due to untimely adjustment caused by reverse lag of a thermal coupler of an existing monitoring device.
Description
Technical field
The utility model is related to the smoke temperature measurement device of the semiclosed mineral heating furnace flue harnessing project of ferroalloy production field, particularly mn site doping and power generation system with residual heat of fume.
Background technology
Ferroalloy（Including Si-Fe, Mn-Fe, Cr-Fe, Mn-Si-Fe etc.）It is that alloy obtained from redox reaction is carried out in mineral hot furnace.Substantial amounts of flue gas can be produced in smelting process.Removing dust project and fume afterheat utilizing works are required for measuring flue-gas temperature, and carry out to it effective control.
At present, the method for measurement flue-gas temperature is all to use thermocouple on-line measurement.Because in pipeline section, diametrically the temperature of difference is different, thus the temperature that measurement is obtained is also different.It can be seen that, the temperature that thermocouple is measured can only represent the temperature of sample point.What is more important, thermocouple temperature measurement has serious hysteresis quality, and temperature change is faster, and the delayed time is more.In mineral hot furnace operation, in-furnace temperature usually raises tens or even a few Baidu suddenly, because thermocouple can not detect the temperature after mutation in time, so as to cause the action of fire door electric-control system delayed and burn out system element.For example in flue gas ash removal engineering, if flue-gas temperature is raised suddenly, thermocouple has little time reaction, and the filter bag of deduster will be burned.
Utility model content
Technical problem to be solved in the utility model is, in view of the shortcomings of the prior art, providing a kind of sensitivity high semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device, it is to avoid burn out system element because the action of fire door electric-control system is delayed.
In order to solve the above technical problems, the technical scheme that the utility model is used is：A kind of semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device, including processor, the processor are connected with oxygen-containing quantity sensor by oxygen analyser, and the probe of the oxygen-containing quantity sensor is inserted in semiclosed In The Sub-mergedfurnace of The Ferroalloys flue or smoke exhaust barrel；The processor is connected by driving relay and the electric-control system of semiclosed In The Sub-mergedfurnace of The Ferroalloys fire door.
Method using above-mentioned measure and control device semiclosed In The Sub-mergedfurnace of The Ferroalloys measurement exhaust gas volumn is：
（1）Determine thermal discharge
1）Determine the ferroalloy weight Q smelted in the unit interval in semiclosed In The Sub-mergedfurnace of The FerroalloysFe：
QFe=W÷PD
In formula：QFe-- unit interval ferroalloy weight, t/h；W is semiclosed In The Sub-mergedfurnace of The Ferroalloys input transformer active power, kW；PDTo smelt the power consumption of 1 ton of ferroalloy, kWh/t.
2）Determine the quantity V of generation CO in unit interval stoveCO：
VCO=1000×QJ×C%÷12=83QFePJC%=83WPJC%÷PD
In formula：VCOThe CO gas flows that-unit interval produces, mol/h；The weight percentage of fixed carbon in C%- coke.
3）Determine in the unit interval that carbon monoxide burns liberated heat Q completelyF：
Because every molar carbon monoxide burning liberated heat is about 281 kilojoules, so QFIt can be calculated by following formula：
QF=281VCO=23333WPJC%÷PD
In formula：QFCO burning liberated heat, kJ/h in-unit interval burner hearth；PJTo smelt the dry coke weight of 1 ton of ferroalloy consumption, kg/t.
（2）Determine flue gas caloric receptivity QX
1）Determine that the unit interval enters the air capacity V of burner hearthK:
Because：CO+0.5O2=CO2 VO2=0.5VCO=0.5VCO2
In formula：VO2- unit interval oxygen demand, mol/h；VCO2The carbon dioxide that-unit interval CO burning is produced, mol/h.
Then, the unit interval sucks the air capacity V of burner hearthKFor：
VK=VO2÷(%O2 marks-%O2)=41.7×QFe×PJ×C%÷(%O2 marks-%O2)
=41.7WPJC%÷PD(%O2 marks-%O2)
In formula：VK- the unit interval sucks the air capacity of burner hearth, mol/h；%O2 marksAnd %O2The volumn concentration of oxygen respectively in air and flue gas.
2）Determine n moles in the unit interval of flue-gas temperature by T1It is increased to T2The heat energy needed：
In formula, QXIt is n moles of flue-gas temperature by T1It is increased to T2The heat energy needed, unit is kJ/h；
For flue gas mean specific heat, unit is kJ/ (mol K)；T2For the flue-gas temperature after heating, unit is K；T1For mineral hot furnace environment temperature, unit is K.
（3）Determine flue-gas temperature T2
Be equal to heat release according to heat balance principle heat absorption is with system synthesis heat insulating coefficient product：QX=QFη or：
Arrange：
In formula：η is system synthesis heat insulating coefficient, and span is 0.5-0.95.
（4）Judge flue-gas temperature whether setting temperature range and whether send action command.
If flue-gas temperature T2Less than the flue-gas temperature lower limit of setting, then processor output turns down the on-off model of semiclosed In The Sub-mergedfurnace of The Ferroalloys fire door, turns down fire door.When intermediate value of the flue-gas temperature for the flue-gas temperature lower and upper limit of setting, fire door stopping action；If flue-gas temperature exceedes the flue-gas temperature upper limit of setting, processor exports the on-off model for opening big fire door, and fire door is progressively opened greatly, stopped when intermediate value of the flue-gas temperature for the flue-gas temperature lower and upper limit of setting.
Flue-gas temperature Computing Principle of the present utility model is：Produced during ferroalloy smelting with substantial amounts of CO gases.In semiclosed furnace, the small part in these CO gases is reacting in rising through charge process with the oxide in raw material, high oxide is reduced to low oxide, itself is oxidized to CO2；It is most of then directly burnt in fire door and be changed into CO2Gas, while releasing substantial amounts of heat.For the same ferroalloy trade mark, it is substantially stationary that unit product, which smelts releasing CO, and CO burning liberated heat is also fixed.
In semiclosed mineral hot furnace, maximum smoke temperature is the temperature that the fuel gas such as generation CO and suction can reach without superfluous air burning in stove.Superfluous oxygen is more in flue gas, and flue gas oxygen content is higher, flue-gas temperature is lower；Vice versa.Flue-gas temperature can ignore the contribution of electric energy, and flue gas enthalpy can be regarded as approx to be provided by the heat energy of CO burnings releasing in stove completely.
Compared with prior art, the utility model have the advantage that for：Device of the present utility model is under the premise of system is gastight, and sensor probe can quick and precisely measure the flue-gas temperature at burner hearth flue entrance installed in smoke exhaust barrel optional position；The utility model device sensitivity is high, and the measure and control device that can effectively solve to use at present causes the action of fire door electric-control system delayed, causes system element, the problem of particularly dedusting filtering bag large area is burnt out.
Brief description of the drawings
Fig. 1 is the semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device of the embodiment of the utility model one；
Fig. 2 is the semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device external structure schematic diagram of the embodiment of the utility model one.
Embodiment
As shown in Figure 1, the semiclosed In The Sub-mergedfurnace of The Ferroalloys flue gas measurement and control device of the embodiment of the utility model one, including processor, the processor is connected with oxygen-containing quantity sensor by oxygen analyser, and the probe of the oxygen-containing quantity sensor is inserted in semiclosed In The Sub-mergedfurnace of The Ferroalloys flue or smoke exhaust barrel；The processor is connected by driving relay with semiclosed In The Sub-mergedfurnace of The Ferroalloys fire door or the wild air-valve valve of flue；The processor is connected with display module and Keyboard drive module；The flue gas oxygen content scope of the oxygen-containing quantity sensor measurement is 0-25%.
The processor is connected with alarm, such as buzzer, and alarm can send alarm signal when flue-gas temperature exceedes the flue-gas temperature upper limit of setting or the flue-gas temperature lower limit less than setting.
The utility model device is 100~2300 DEG C to the observing and controlling scope of flue-gas temperature.
Display module is LED display, the temperature signal of video-stream processor output.
Processor is also associated with communication module, for the measure and control device of the present invention to be connected with other automation equipments, automation control system, can receive and transmit instruction, data by communication module, such as：Semiclosed In The Sub-mergedfurnace of The Ferroalloys motor start-stop, rotating speed height on the computer screen of the data displays such as exhaust gas volumn, flue-gas temperature, furnace power to distant place, will be controlled low.
On the installation site of sensor probe, if system is not leaked out, between from burner hearth flue entrance to air exit any position all can, if system air leakage, nearly flue entrance position should be arranged on as far as possible.
The application method of semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device is as follows：
1）Measure and control device is arranged in cabinet, cabinet is arranged on control room or other correct positions；
2）The control circuit such as the switching of cabinet output port and fire door electric-control system, spacing is connected；
3）Pass through Keyboard drive module（It is 6 × 4 keyboards in the present embodiment）In processor（CPU）The upper and lower bound value of interior setting flue-gas temperature control；
4）The probe of oxygen-containing quantity sensor is inserted in flue or smoke exhaust barrel and detects flue gas oxygen content, when the bag-type dust engineering for smoke gas treatment, sensor probe is advantageously mounted at deduster front end, the chimney segment as close to electric furnace end.When being utilized for fume afterheat, installed in deduster front end or rear end；
5）220V power supplys, the local oxygen content in air of input, flue gas specific heat capacity are connected to flue-gas temperature measure and control device（About 0.0314kJ/mol.K), system synthesis heat insulating coefficient and environment temperature, set temperature control upper and lower bound；
6）When flue-gas temperature exceedes the flue-gas temperature upper limit of setting or the flue-gas temperature lower limit less than setting, the on-off model of processor output control fire door or valve switch.
7）Fire door electric-control system automatically opens up or turned down mineral hot furnace fire door after switching signal is connected to, and increases or decreases the air capacity into stove, so as to reduce or improve flue-gas temperature, completes flue-gas temperature control.
The higher limit and lower limit of flue-gas temperature control need to be set using actual conditions according to the electric furnace and fume afterheat.
Embodiment 1
The utility model is applied to the fibre selection that fume afterheat generates electricity.Certain silicomanganese alloy mineral hot furnace is provided with smoke and waste steam boiler, and inner flue gas of the stove carries out heat exchange by waste heat boiler, be then sent through bag-type dust collector purifying smoke in the presence of frequency converting induced draft fan, and the flue gas after cloth bag purification is discharged from aiutage.Power generation system with residual heat of fume requires the control of burner hearth flue entrance flue-gas temperature in 450~650 DEG C of scopes.The comprehensive heat insulating coefficient of the submerged arc furnace system is 0.85 after measured, and environment temperature is 40 DEG C.
The probe of sensor is arranged on 2-3 meters of eminences of purifying smoke aiutage after mineral heating furnace flue dedusting, probe extend into exhaust cross section midpoint and is sampled；Connect 220V power supplys, the local oxygen content in air of input（20.95%）, flue gas specific heat capacity（About 0.0314kJ/mol.K), system synthesis heat insulating coefficient（0.85）And environment temperature（40℃）, set the temperature control upper limit（450℃）And lower limit（650℃）.The flue gas oxygen content signal detected was transported to processor by sensor in 1 second；Complete data processing immediately in processor, flue-gas temperature is calculated automatically, so as to complete the measurement of flue-gas temperature.Temperature signal is delivered on cabinet LED display and shows flue-gas temperature by processor.Illustrate：When the sample oxygen content that the probe of sampling detector is got is 17.48%, the flue-gas temperature that LED display is shown is 528 DEG C, now temperature is only second between temperature control upper and lower bound (median), and temperature measurement and control instrument not output switch amount, fire door electric-control system is not acted.When it is 16.76% to measure flue gas oxygen content, flue-gas temperature is shown as 548 DEG C, and temperature has reached upper control limit.Now, processor is stepped up the air capacity that mineral hot furnace burner hearth is sucked, flue-gas temperature then progressively declines to fire door electric-control system output increase frequency control fan speed signal, until temperature reaches 550 DEG C ± 550 × 10% of the median of the temperature range of setting（Corresponding flue gas oxygen content 17.47%）When action stop.Otherwise, when the flue gas oxygen content measured is 18.17%, flue-gas temperature is shown as 450 DEG C, now because temperature has reached lower limit, need the temperature of lifting flue gas, processor can be exported to fire door electric-control system reduces the on-off model of frequency conversion fan rotating speed, and action stops when temperature reaches 550 DEG C of the intermediate value of the temperature range of setting, so that it is guaranteed that flue-gas temperature is in the control range of setting.
Embodiment 2
The utility model is administered applied to mineral heating furnace flue udst separation.2 × 25MW of certain company mineral heating furnace flue duster systems, air-introduced machine uses high pressure power frequency motor, and exhausting ability and pressure head can meet peak load needs, and the said firm is originally by artificial Electronic control burner hearth petticoat pipe fire door size to control burner hearth inhaled air volume.Filter bag of dust collector normal working temperature is 200 DEG C, and maximum operating temperature is no more than 250 DEG C, and minimum temperature is not less than 150 DEG C.Measure the mineral hot furnace under nominal power, flue gas is 145 DEG C or so, system heat insulating coefficient 0.8,35 DEG C of environment temperature from sample point to filter bag porch flue-gas temperature cooling extent.
The probe of flue gas oxygen content sensor is arranged on the position that dust pelletizing system pipeline is bordered on direct exhaust chimney；Connect 220V power supplys, the local oxygen content in air of input（20.95%）, flue gas specific heat capacity（About 0.0314kJ/mol.K), system synthesis heat insulating coefficient（0.8）And environment temperature（35℃）, set 395 DEG C of the measurement point temperature control upper limit（=250+145=395）With 295 DEG C of lower limit（150+145=295）, the two values are set as that processor sends the control point of switching value action command.When it is 18.36% to measure flue gas oxygen content, the flue-gas temperature that processor computing is drawn is 395 DEG C, and now temperature has reached upper control limit, processor output switch amount action signal, fire door motor drive mechanism action, opens big fire door, into the air increase of burner hearth, flue-gas temperature is gradually reduced；When flue gas oxygen content increase to for 18.73% when action stop, now LED displays temperatures be 345 DEG C.When it is 295 DEG C that flue gas oxygen content, which increases up to 19.09%, LED displays temperatures, processor output switch amount action signal, fire door motor drive mechanism action turns down fire door aperture, and the air into burner hearth is reduced, and flue-gas temperature is stepped up；When flue gas oxygen content drop to for 18.73% when action stop.So that it is guaranteed that filter bag works in 150~250 DEG C of temperature ranges of setting, both avoid high temperature and burnt out filter bag, prevent low temperature to cause filter bag knot dirt again.
Median in the utility model embodiment refers to ± the 10% of the higher limit of the flue-gas temperature of setting and the arithmetic mean of instantaneous value of lower limit.
Claims (4)
1. a kind of semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device, it is characterized in that, including processor, the processor is connected with oxygen-containing quantity sensor by oxygen analyser, and the probe of the oxygen-containing quantity sensor is inserted in semiclosed In The Sub-mergedfurnace of The Ferroalloys flue or smoke exhaust barrel；The processor is connected by driving relay and the electric-control system of semiclosed In The Sub-mergedfurnace of The Ferroalloys fire door.
2. semiclosed In The Sub-mergedfurnace of The Ferroalloys flue-gas temperature measure and control device according to claim 1, it is characterised in that the processor is connected with display module and Keyboard drive module.
3. semiclosed In The Sub-mergedfurnace of The Ferroalloys flue gas measurement and control device according to claim 1 or 2, it is characterised in that the processor is connected with alarm.
4. semiclosed In The Sub-mergedfurnace of The Ferroalloys flue gas measurement and control device according to claim 1 or 2, it is characterised in that the processor is connected with communication module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320641312.1U CN203501822U (en) | 2013-10-17 | 2013-10-17 | Semi-closed iron alloy submerged arc furnace smoke temperature monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320641312.1U CN203501822U (en) | 2013-10-17 | 2013-10-17 | Semi-closed iron alloy submerged arc furnace smoke temperature monitoring device |
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| CN203501822U true CN203501822U (en) | 2014-03-26 |
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| CN201320641312.1U Expired - Lifetime CN203501822U (en) | 2013-10-17 | 2013-10-17 | Semi-closed iron alloy submerged arc furnace smoke temperature monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528387A (en) * | 2013-10-17 | 2014-01-22 | 广西铁合金有限责任公司 | Flue-gas temperature measuring and control device and flue-gas temperature measuring and control method for semi-closed ferroalloy submerged arc furnace |
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2013
- 2013-10-17 CN CN201320641312.1U patent/CN203501822U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528387A (en) * | 2013-10-17 | 2014-01-22 | 广西铁合金有限责任公司 | Flue-gas temperature measuring and control device and flue-gas temperature measuring and control method for semi-closed ferroalloy submerged arc furnace |
| CN103528387B (en) * | 2013-10-17 | 2015-03-25 | 广西铁合金有限责任公司 | Flue-gas temperature measuring and control method for semi-closed ferroalloy submerged arc furnace |
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Inventor after: Zeng Shilin Inventor after: Jia Yanhua Inventor after: Zhong Yaoqiu Inventor after: Wu Yongchang Inventor after: Wei Guoqiu Inventor after: Huang Rongsheng Inventor after: Liang Rui Inventor before: Jia Yanhua Inventor before: Zeng Shilin Inventor before: Su Jicai Inventor before: Nong Weijian Inventor before: Liang Zhilin Inventor before: Huang Kelin Inventor before: Liu Zubo Inventor before: Li Kexian |
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