CN205447811U - Boiler is mixed and is burnt ventilation air methane stable combustion control system - Google Patents
Boiler is mixed and is burnt ventilation air methane stable combustion control system Download PDFInfo
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- CN205447811U CN205447811U CN201521129883.2U CN201521129883U CN205447811U CN 205447811 U CN205447811 U CN 205447811U CN 201521129883 U CN201521129883 U CN 201521129883U CN 205447811 U CN205447811 U CN 205447811U
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- 238000009423 ventilation Methods 0.000 title claims abstract description 86
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 78
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000012546 transfer Methods 0.000 claims abstract description 65
- 230000000977 initiatory effect Effects 0.000 claims abstract description 15
- 238000004880 explosion Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 161
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- 230000008859 change Effects 0.000 description 11
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- 238000000034 method Methods 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 241000707825 Argyrosomus regius Species 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 238000009825 accumulation Methods 0.000 description 2
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Abstract
The utility model discloses a boiler is mixed and is burnt ventilation air methane stable combustion control system, including ventilation air methane transfer passage, ventilation air methane transfer passage's initiating terminal and the air outlet of return air vertical intercommunication, ventilation air methane transfer passage's the end end and the air intake intercommunication of boiler, the last air distribution mouth of having seted up of ventilation air methane transfer passage, boiler is mixed and is burnt ventilation air methane stable combustion control system still includes: a gas sensor for detecting ventilation air methane concentration, a gas sensor installs among the ventilation air methane transfer passage, according to control command's valve door controller is sent to ventilation air methane concentration, according to control command adjusts the adjusting valve of the aperture of air distribution mouth, adjusting valve sets up on the air distribution mouth. The utility model provides a boiler is mixed and is burnt ventilation air methane stable combustion control system can control ventilation air methane's concentration effectively, has improved the stability and the security of burning.
Description
Technical field
This utility model relates to a kind of Boiler Mixed Burning ventilation air gas and stablizes combustion control system.
Background technology
In progress of coal mining, composing a large amount of gas deposited and usually can be rushed to digging space in coal seam, employing mine ventilation eliminating mine gas is one of basic means of gas control.So, substantial amounts of gas while the valuable gas energy of waste, can also result in greatly pollution to atmospheric environment along with main fan in mine row is to air.
Coal resources in China relatively horn of plenty, but overwhelming majority coalfield belongs to high methane coalfield, and coal-bed gas breathability is poor, mine gas extraction utilization rate is relatively low, overwhelming majority gas is drained in air by mine ventilation mode, gas bearing capacity in quite a few mine air-lack stream between 0.5%-0.75%, weary distinguished and admirable in containing there being gas in a large number.
In addition, mine is for administering gas exceeding limit, also take gas pumping measure, gas pumping mainly has this coal seam to take out mode, adjacent layer mode, goaf mode etc. in advance, for solving coal-face especially fully-mechanized mining working local gas overrun issues, such as Air return corner gas exceeding limit, goaf mash gas extraction because its quantities is less, low cost, solve Air return corner gas exceeding limit effect substantially, adapt to needs that mine comprehensive mining machinery quickly propels and used in a large number by mine.The gas of goaf extraction is low due to gas density, major part is between 3%-8%, this part gas is difficult to be utilized that (low-concentration gas power generation requires that gas optium concentration is about 9.5%, the gas electricity ability of less than 8% will be the least, unit operation can not be maintained when gas is less than 6%), it is typically all and is directly discharged in air.
Owing to coal is staple commodities, cost of transportation is high, and substantial amounts of colliery is provided with power plant near well head, changes defeated coal for transmission of electricity.Owing to coal-fired boiler in power plant needs to consume large quantity of air, and power plant's distance well head is general all in the range of 1000m, thus exists and mine introduces containing the weary wind of gas the probability participating in burning in boiler of power plant.Owing to gas easily burns, will improve coal burning performance, gas combustion also produces amount of heat, while having saved fire coal, decreases the gas amount to atmosphere discharge.Therefore, if using steam power plant instead mine air-lack, making gas participate in thermal power plant boiler burning, huge economic benefit being produced.
Fig. 1 is the system that in a kind of traditional mine air-lack stream, gas participates in steam power plant's coal-fired boiler combustion.It includes that weary airflow channel, air quantity regulate mouth, methane explosion prevention system；Weary airflow channel side connects main fan in mine air outlet, and opposite side connects steam power plant's air-introduced machine entrance；Air quantity regulation mouth position determines according to mine air-lack amount and coal-burning boiler air quantity, if weary air quantity is more than steam power plant's air quantity, air quantity regulation mouth is located at main fan in mine air outlet, if weary air quantity is located at steam power plant's air-introduced machine air intake vent less than steam power plant's air quantity, air quantity regulation mouth.Mine air-lack is after main fan in mine extracts ground out, and the air channel arranged through ground flows into the air-introduced machine of coal-burning power plant near pithead, air-introduced machine send into coal-fired boiler in power plant.Owing to coal-burning power plant's air quantity is not quite identical with mine air-lack amount, when mine air-lack amount is more than steam power plant's air quantity, air quantity regulation mouth is located at main fan in mine air outlet, when mine air-lack amount is less than steam power plant's air quantity, air quantity regulation mouth is located at steam power plant's air-introduced machine entrance, to reduce flowing resistance loss.
But, there is following defect in traditional technical scheme:
First, after Boiler Mixed Burning ventilation air gas, owing to ventilation air gas concentration can change, so Combustion Operation of Boilers is produced impact, especially during variation ofgas density speed (when such as opening stove), pulverized-coal fired boiler flame is unstable, and boiler is affected greatly by combustion conditions change, even set off an explosion and temperature too high damage boiler, need to stably burn.
Second, during boiler shutdown, substantial amounts of ventilation air gas is accumulated in the confined spaces such as the air preheater of weary wind transfer passage and boiler is interior, methane accumulation may be produced, such as entering boiler under the conditions of causing naked light or high temperature etc. causes gas explosion or local temperature too high, and the aggravation combustible spontaneous combustion of gas leakage to air preheater smokejack or initiation are exploded or burning.
3rd, in the case of boiler normal combustion, air preheater exists to smokejack internal hemorrhage due to trauma problem, and exhaust gas temperature is too high or has Mars or air preheater heat exchange walls surface temperature too high, the temperature of oxidized further lifting air preheater after ventilation air gas entrance, igniting flammable items matter or gasification heat release itself cause air preheater temperature too high, damage air preheater.
Therefore, it is highly desirable to design a kind of Boiler Mixed Burning ventilation air gas and stablizes combustion control system to overcome drawbacks described above.
Utility model content
In view of this, this utility model provides a kind of Boiler Mixed Burning ventilation air gas and stablizes combustion control system, to control the concentration of ventilation air gas, the stability improving burning and safety, it is intended to overcome the defect in the presence of prior art.
Boiler Mixed Burning ventilation air gas provided by the utility model is stablized combustion control system and is included that weary wind transfer passage, the described weary initiating terminal of wind transfer passage connect with the air outlet of return air shafts, and the end end of described weary wind transfer passage connects with the air inlet of boiler；Air distribution outlet is offered on described weary wind transfer passage.
Described Boiler Mixed Burning ventilation air gas is stablized combustion control system and is also included: for detecting the first firedamp sensor of ventilation air gas concentration, described first firedamp sensor is arranged in described weary wind transfer passage；The valve positioner of control instruction is sent according to described ventilation air gas concentration；Regulate the control valve of the aperture of described air distribution outlet according to described control instruction, described control valve is arranged on described air distribution outlet.
Preferably, described first firedamp sensor is arranged on the initiating terminal of described weary wind transfer passage.
Preferably, being provided with conveying fan in described weary wind transfer passage, the inlet scoop of described conveying fan is arranged towards the initiating terminal of described weary wind transfer passage, and the blowing mouth of described conveying fan is arranged towards the end end of described weary wind transfer passage.
Preferably, described first firedamp sensor is between initiating terminal and the described conveying fan of described weary wind transfer passage.
Preferably, described Boiler Mixed Burning ventilation air gas is stablized combustion control system and is also included: wind pressure sensor, and described wind pressure sensor is arranged in described weary wind transfer passage, and between the end end of described conveying fan and described weary wind transfer passage；The blast detected according to described wind pressure sensor controls the blast controller of described conveying fan, and described blast controller electrically connects with described conveying fan.
Preferably, being additionally provided with the second firedamp sensor in described weary wind transfer passage, described second firedamp sensor is arranged on the end end of described weary wind transfer passage, and described second firedamp sensor electrically connects with described valve positioner.
Preferably, the air inlet of described boiler is provided with boiler fan, and described boiler fan applies negative pressure in described weary wind transfer passage.
Preferably, the air inlet of described boiler fan is provided with normally closed air door.
Preferably, the air inlet of described boiler is provided with explosion proof door.
Preferably, described weary wind transfer passage offers evacuation port in the position near end end.
Use Boiler Mixed Burning ventilation air gas provided by the utility model to stablize combustion control system, the gas density being conveyed into Boiler Mixed Burning can be controlled at a reasonable steady state value, to ensure stably to mix and burning, prevent unstable combustion from affecting boiler operatiopn.Therefore, Boiler Mixed Burning ventilation air gas provided by the utility model stablizes combustion control system can efficiently control the concentration of ventilation air gas, improves stability and the safety of burning.
Accompanying drawing explanation
Preferred embodiment in this utility model will be described in detail below, it will help understand the purpose of this utility model and advantage, wherein by accompanying drawing:
Fig. 1 is the system that in a kind of traditional mine air-lack stream, gas participates in steam power plant's coal-fired boiler combustion.
Fig. 2 is the preferred embodiment that Boiler Mixed Burning ventilation air gas of the present utility model stablizes combustion control system.
Detailed description of the invention
Below in conjunction with embodiment, this utility model is described in detail.The most identical parts are presented with like reference characters.It should be noted that the word "front", "rear" used in describing below, "left", "right", "up" and "down" refer to the direction in accompanying drawing, word " interior " and " outward " refer respectively to the direction towards or away from particular elements geometric center.
Fig. 2 is the preferred embodiment that Boiler Mixed Burning ventilation air gas of the present utility model stablizes combustion control system.As shown in Figure 2, Boiler Mixed Burning ventilation air gas provided by the utility model is stablized combustion control system and is included weary wind transfer passage 1, the described weary initiating terminal of wind transfer passage 1 connects with the air outlet of return air shafts, and the end end of described weary wind transfer passage 1 connects with the air inlet of boiler.Air distribution outlet 4 is offered on described weary wind transfer passage 1.Described Boiler Mixed Burning ventilation air gas is stablized combustion control system and is also included: for detecting the first firedamp sensor 2 of ventilation air gas concentration, described first firedamp sensor 2 is arranged in described weary wind transfer passage 1；The valve positioner (not shown) of control instruction is sent according to described ventilation air gas concentration；Regulate the control valve 3 of the aperture of described air distribution outlet 4 according to described control instruction, described control valve 3 is arranged on described air distribution outlet 4.Described first firedamp sensor 2 can be arranged on the initiating terminal of described weary wind transfer passage 1, for detecting in described weary wind transfer passage 1 gas density at weather gage, and the gas density detected is sent to valve positioner, described valve positioner receives after the gas density of described first firedamp sensor 2, control instruction is sent to described control valve 3 according to this gas density, described control valve 3 controls the aperture of described air distribution outlet 4 according to this control instruction, thus controls intake.
Described valve positioner can be realized by control centre intrinsic in mine or controller, in weary wind transfer passage 1, the weather side of air distribution outlet 4 installs the first firedamp sensor 2, the gas concentration that firedamp sensor is monitored can be uploaded to control centre or controller, to automatically control aperture or the operating frequency of conveying fan 5 (being described below) of air distribution outlet 4, gas concentration is controlled at steady state value, such as 0.3%.
In general, described Boiler Mixed Burning ventilation air gas is stablized combustion control system and can the gas density that be conveyed into Boiler Mixed Burning be controlled at a steady state value, to ensure stably to mix burning, prevents unstable combustion from affecting boiler operatiopn.For the co-combustion system using mine air-lack to be single gas source, described air distribution outlet 4 is offered outside the negative pressure section of weary wind transfer passage 1, described control valve 3 (preferably electrically operated valve) is installed in described air distribution outlet 4, and using the mode being automatically adjusted air distribution amount, it is ensured that in passage, gas is in steady state value.Additionally, due to the weary wind mixing burning is single gas source, gas density can regulate downwards on the basis of ventilation air gas concentration minimum, if mine air-lack mash gas concentration daily fluctuation scope is between 0.28%-0.35%, can set this steady state value as 0.28%.When air distribution outlet 4 weather side ventilation air gas concentration is 0.28%, air distribution outlet 4 could be arranged to closed mode.When concentration raises, air distribution outlet 4 strengthens aperture or blower fan increases operating frequency to increase air distribution amount, otherwise air distribution outlet 4 aperture reduces automatically or blower fan reduces operating frequency, by constant for the gas density maintenance after air distribution.
Preferably, being provided with conveying fan 5 in described weary wind transfer passage 1, the inlet scoop of described conveying fan 5 is arranged towards the initiating terminal of described weary wind transfer passage 1, and the blowing mouth of described conveying fan 5 is arranged towards the end end of described weary wind transfer passage 1.Make produced ventilation air gas in described return air shafts be entered in described weary wind transfer passage 1 by the initiating terminal of described weary wind transfer passage 1, and entered by the end end of described weary wind transfer passage 1 in the air inlet of described boiler.Described first firedamp sensor 2 is between initiating terminal and the described conveying fan 5 of described weary wind transfer passage 1.
Position about air distribution outlet 4 sets, it is preferable that as being provided with conveying fan 5 in passage, should be in the side, inlet scoop of conveying fan 5, if weary wind fed distance is short, carries by power plant fans and main fan in mine surplus capacity, should be near power plant fans side.As the least without negative pressure section or negative pressure in passage, it is difficult to ensure air distribution requirement, should install conveying fan 5 in air distribution outlet 4, this conveying fan 5 is preferably automatic VFC blower fan, is in steady state value with gas in realizing passage；Such as boiler primary air fan, overfire air fan surplus capacity enough, boiler fan 7 (being described below) can be set to the blower fan that automatic frequency-conversion controls.The control of fan delivery should need intake to be as the criterion with boiler, and i.e. during the frequency conversion of blower fan automatic constant-pressure, blower pressure is to be just met for First air and secondary air flow demand, and blast regulation control should be incorporated into boiler combustion control system.In actual use, air distribution outlet 4 is preferably provided in the position away from power plant fans, as apart from more than power plant fans 50m, and installed distinguished and admirable mixing apparatus in the passage of the downwind side of air distribution outlet 4 additional, to ensure that weary wind fully mixes in fresh air with passage.
Preferably, being also provided with the second firedamp sensor in described weary wind transfer passage 1, described second firedamp sensor is arranged on the end end of described weary wind transfer passage 1, and described second firedamp sensor electrically connects with described valve positioner.In actual use, the second firedamp sensor is installed in power plant fans porch, to examine whether air distribution after gas concentration is expection steady state value, as exceeded tolerance band with expection phase difference, reason should be analyzed and it is contemplated that take secondary micro-air distribution measure to solve, the data that the data that described second firedamp sensor is gathered and described first firedamp sensor 2 are gathered act on and described valve positioner simultaneously, to realize being controlled the aperture of air distribution outlet 4.
Concentration for gas sets steady state value, when mixing burning gas density when ventilation air gas mixes gas with raising, as mixed in burning mine, low pressure extraction system is from adopting the gas of extraction near the Air return corner of face, ventilation air gas concentration after blending controls steady state value and can raise, raise concentration and should set higher limit as mixing burning concentration safely, owing to boiler type is more and burning complexity, higher limit is typically not to be exceeded 1%, depending on occurrence size should be with reality examination sintering fruit.The method determining higher limit is burnt in examination: boiler is passed through ventilation air gas when mixing burning for the first time, Ying Yi little concentration is burnt a period of time, as tried to burn 2 weeks for the gas of 0.1%, observe variation in combustion situation, obtain reality and control empirical method and parameter, it is gradually increased gas density again, as increased to 0.2%, observe variation in combustion situation again, obtaining after reality controls empirical method and parameter and the most slightly increase gas density, along with the lifting of gas density, the amplitude every time increased should suitably diminish, until after combustion instability is difficult to control to, then to be down to a safe concentration be higher limit.
In mine air-lack, gas density and mash gas extraction amount increase with the coal mining degree of depth, typically there is slow ascendant trend, can pass through periodic observation, analyzing the change of ventilation air gas concentration limit value and mash gas extraction can the change of incorporation, and recalculate and mix burning gas density and setting value is re-started adjustment, in the case of not breaking through higher limit, suitably raise setting value and adjust boiler operating parameter accordingly, to realize improving as far as possible in the range of safety limit mixing burning gas amount.
Preferably, described Boiler Mixed Burning ventilation air gas is stablized combustion control system and is also included: wind pressure sensor 6, and described wind pressure sensor 6 is arranged in described weary wind transfer passage 1, and between the end end of described conveying fan 5 and described weary wind transfer passage 1；The blast detected according to described wind pressure sensor 6 controls the blast controller of described conveying fan 5, and described blast controller electrically connects with described conveying fan 5.Additionally, the air inlet of described boiler is provided with boiler fan 7, described boiler fan 7 applies negative pressure in described weary wind transfer passage 1.Owing to the conveying of ventilation air gas air-flow is essentially conveying fan 5 in passage, main fan in mine and the result of boiler fan 7 co-operation, take steady wind measure, conveying air quantity can be effectively prevented larger fluctuation occurs, prevent from the weary air quantity entering boiler and gas density are produced impact, it is to avoid the boiler combustion therefore caused is unstable.Air quantity stabilizing measures should be taked, the most direct means are that boiler carries out constant pressure frequency conversion operating for blower fan, in weary wind transfer passage 1 or wind pressure sensor 6 is installed in the relatively stable place of the blast such as inlet air of boiler mouth, measure this place full blast pressure, static pressure and ram compression, and should be to set static pressure or total head as steady state value, control blower fan operating frequency, to ensure stably to blow to boiler, be simultaneously also beneficial to air distribution after gas constant concentration.
In a preferred embodiment of the present utility model, described weary wind transfer passage 1 offers evacuation port in the position near end end.After boiler shutdown, mainly the ventilate ventilating air of side of mine can be will be close in time and completely cut through, as used the measures such as water seal.As do not completely cut through, normally ventilate in passage should be kept, by described evacuation port, ventilation air gas is emptied at passage air outlet, prevent from entering in boiler fan 7 air inlet.In addition, normally closed air door can also be provided with on the air inlet of described boiler fan 7, and open to introduce fresh air by air door after shutdown of boiler, boiler draft system remains in operation and stops after a period of time again, such as, can remain in operation 10 minutes, boiler to be supplied the ventilation air gas emptying in exhaust system.
Preferably, the air inlet of described boiler is provided with explosion proof door 8, to cut off the air blast impact to mine.Described explosion proof door 8 strict implement " safety regulations in coal mine " is about the regulation that near heapstead and ventilation blower 20 meters, No Open Flames, and regulation expands to pithead to the distinguished and admirable porch of power plant.Air quantity regulation mouth exports upwards, and is above the ground level not less than 5 meters.
On the other hand, can arrange at the air preheater smokejack air inlet of boiler and preheated air air outlet whether temperature sensor exists burning risk with monitoring ventilation air gas, described temperature sensor can also be arranged in described weary wind transfer passage 1, such as, the end end of weary wind transfer passage 1 it is arranged on.When exhaust gas temperature exceedes higher limit (such as 550 DEG C), it is believed that cause ventilation air gas to have the oxidized or danger of burning owing to temperature is too high；Temperature anomaly at preheated air air outlet, as higher than exhaust gas temperature, it is believed that ventilation air gas is the most oxidized or burns, and should stop ventilation air gas supply immediately, changes into supplying fresh air to boiler.Additionally, the air preheater not leaked out should be selected, and the inspection of reinforced platoon's flue and cleaning, ignite combustible in smokejack to prevent ventilation air gas from meeting Mars after entering smokejack.
Boiler Mixed Burning ventilation air gas provided by the utility model is stablized combustion control system and is applicable to various types of boiler, owing to gas is particularly easy to burning and caloric value, the highest (caloric value is 11967kcal/kg, 1m3 pure gas combustion calorific value is 8580kcal, for standard coal 1.71 times, weary air temperature can be improved 280 degree by such 1% ventilation air gas burning), it is particularly well-suited to the CFBB of burning inferior coal, such as gangue boiler, can significantly improve combustion conditions characteristic, reduce and spoil mixes coal amount.
Use ventilation air gas to mix burning and answer prioritizing selection combustion with meagre oxygen technique；The preferably the highest degree of metamorphism of burning low grade coal boiler, high ash or gangue boiler；And preferentially select CFBB, chain-grate boiler also can obtain good result, takes suitable Temperature Control Measures, and pulverized-coal fired boiler also can obtain better effects；The concrete parameter that controls of burning is depending on gas density, coal and boiler combustion technique in weary wind.
According to all kinds of Combustion Operation of Boilers characteristics, gas flammable properties should be made full use of, select suitable burning process and control measure, it is achieved low temperature combustion with meagre oxygen, in boiler exhaust gas, oxygen content can be controlled in about 3% even lower, preferably burning inferior coal or the Circulating Fluidized Bed Process of spoil.The preferable fired state of CFBB is full burner hearth low temperature homogenous combustion, and homogenous combustion to be realized is necessary for suppressing siege burning, and all spaces that coal-fired combustible volatile is distributed as evenly as possible in burner hearth also realize combustion with meagre oxygen.Owing to weary wind containing gas, when weary wind enters siege as First air, in weary wind, gas burns rapidly, temperature during the purer air of siege temperature to rise, ascensional range is relevant to gas density forward, so improve bed temperature beneficially colm as in spoil combustible decompose and inhibit CO etc. to burn, combustable gas concentration in the flue gas leaving siege can be improved；Should take to suppress siege burning measure for fat coal, as reduced coal supply amount, rationally increase coal supply lumpiness, mix non-combustible matter such as desulfurizing agent, strengthen gas density in primary air flow, suitably reduction First air, strengthen circulating ratio or reduce circulating flue gas temperature, this is accomplished by when near boiler of power plant, weary wind transfer passage 1 should be separated into two independent wind paths, in two wind paths, air-valve is set, and outer open to atmosphere regulation mouth is respectively set at air-valve downwind side, also air-valve is set, with individually regulation First air and the air quantity of secondary wind and gas density in regulation mouth；Secondary wind typically as far as possible early should mix with flue gas and be mixed evenly, owing in weary wind, itself is some higher containing combustible content in inflammable gas and the flue gas that is involved in, low-temperature oxidation combustion reaction is there is with flue gas the most earlier in so secondary wind when mixing, and during burning, can suitably increase secondary air flow (specifically determining) depending on the combustion position such as oxygen concentration and fire box temperature in smoke evacuation, it is considered as setting up tertiary air, by more homogenous combustion in such burner hearth.Same thinking can be used to be controlled for pulverized-coal fired boiler, difference is that pulverized-coal fired boiler can not realize coal circulating combustion, it is difficult to low-temperature burning and the more difficult control of ignition temperature, it is contemplated that suitably reduce coal supply amount, strengthen primary air flow ratio, in reduction First air, gas density is with cooling, reduce secondary air flow ratio and realize combustion with meagre oxygen, additionally coal quality requirements aspect can reduce coal supply ature of coal and such as change burning clean fine coal is raw coal, mix colm or mix spoil etc., to realize burner hearth homogenous combustion in the case of lower temperature, as can be seen here, the pulverized-coal fired boiler requirement to ature of coal can be reduced after mixing burning ventilation air gas.
Additionally, due to two, in tertiary air containing gas, there may be deflagration phenomenon when mix with flue gas, particularly pulverized-coal fired boiler, tackle combustion conditions and be controlled by.A lot of owing to affecting the factor of boiler combustion, deflagration phenomenon is difficult to find out exact cause, can first be passed through fresh wind when furnace lifting, be then gradually increased gas density in primary and secondary air, it is ensured that burning is in steady statue all the time.Also should first be passed through fresh wind when opening stove after banking fire, be then gradually increased gas density.Owing to boiler exhaust gas containing water vapour, generally account for 18%, when mixing burning ventilation air gas, the content of water vapour will raise, for avoiding dew point temperature, it should be noted that exhaust gas temperature is not less than the dew point temperature of reality, the most somewhat improve exhaust gas temperature such as raising 10 DEG C, to prevent the corrosions such as air preheater from damaging.
In use, when boiler opens stove, can first supply fresh air, Deng boiler operatiopn the most without exception after, it is gradually increased gas bearing capacity in supply air again, to steady state value, jointly to act on, with the fuel gas accumulated, accidents such as causing blast to prevent gas from entering, and realize steadily opening stove.
Boiler combustion is with boiler model, burning each factor such as coal change and different, after mixing burning ventilation air gas, combustion conditions also will change with variation ofgas density, on the basis of findding out variation ofgas density rule and corresponding control method, boiler combustion control system should integrate variation ofgas density control device, at weary wind transfer passage 1 or primary air fan, gas probe is installed in overfire air fan porch, and according to the control measure with variation ofgas density grasped, adjust boiler operating parameter in time, change such as coal-supplying amount, while ensureing boiler even running, mix less or do not mix fresh air, realize ventilation air gas to be all utilized.Gas is fixed on the benefit of constant, boiler combustion is easily stable, shortcoming is to be likely not to have to maximally utilize ventilation air gas, raising along with automatic control level, Combustion Operation of Boilers is also more easy to be adjusted at any time, when boiler normal combustion, is considered as under the conditions of gas density higher limit, by the fresh wind air distribution passage Close All in weary wind passage, it is achieved all ventilation air gas such as primary and secondary air.Mix if any extraction low concentration gas, also all should mix in the case of license, adjust the needs of combustion conditions change when coal supply amount can meet variation ofgas density such as boiler in time, maximally utilize waste gas resource.
Boiler Mixed Burning ventilation air gas as above is stablized combustion control system and is had a following useful technique effect:
1, the gas density being conveyed into Boiler Mixed Burning is controlled at a reasonable steady state value, to ensure stably to mix and burning, prevent unstable combustion from affecting boiler operatiopn.
2, during boiler shutdown, take measures to get rid of ventilation air gas in passage and boiler plant (containing air preheater), prevent methane accumulation induction fire or blast.
3, weary wind air after the import and export exhaust gas temperature of air preheater and preheating is carried out the monitoring such as temperature and gas, note abnormalities, drop ventilation air gas conveying immediately, change into pure enter fresh air is combustion-supporting or blowing out, and ascertain the reason process after recover ventilation air gas again and mix burning.
4, the setting of steady state value determines depending on the daily change of ventilation air gas concentration.As weary wind mixes mash gas extraction, it is also contemplated that the maximum concentration limit value of gas can be mixed and mixes mash gas extraction amount.And periodic observation mine air-lack mash gas concentration and mash gas extraction amount, analyze Mine Gas Gushing Changing Pattern, and adjust in time and mix burning gas density and boiler combustion parameter, realize twice laid as far as possible and maximize.
6, for different Actual combustion situations, take reasonably to try to burn test method, obtain and the most formally mix burning after reasonably mixing this upper limit of concentration value of tile kilning, control combustion method and parameter, to ensure to improve as much as possible on the premise of safety to mix burning gas density.
7, for making full use of discarded gas, take to control the means such as boiler coal supply amount in time, to adapt to the needs of variation ofgas density.
8, promote burning of coal owing to mixing burning, provide reliable approach for colm and maximally utilizing of gangue.
Use Boiler Mixed Burning ventilation air gas provided by the utility model to stablize combustion control system, the gas density being conveyed into Boiler Mixed Burning can be controlled at a reasonable steady state value, to ensure stably to mix and burning, prevent unstable combustion from affecting boiler operatiopn.Therefore, Boiler Mixed Burning ventilation air gas provided by the utility model stablizes combustion control system can efficiently control the concentration of ventilation air gas, improves stability and the safety of burning
Last it is noted that above example is only in order to illustrate the technical solution of the utility model, it is not intended to limit；Although this utility model being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of this utility model each embodiment technical scheme.
Claims (10)
1. Boiler Mixed Burning ventilation air gas stablizes a combustion control system, and including weary wind transfer passage, the described weary initiating terminal of wind transfer passage connects with the air outlet of return air shafts, and the end end of described weary wind transfer passage connects with the air inlet of boiler；It is characterized in that, described weary wind transfer passage offers air distribution outlet；
Described Boiler Mixed Burning ventilation air gas is stablized combustion control system and is also included:
For detecting the first firedamp sensor of ventilation air gas concentration, described first firedamp sensor is arranged in described weary wind transfer passage；
The valve positioner of control instruction is sent according to described ventilation air gas concentration；
Regulate the control valve of the aperture of described air distribution outlet according to described control instruction, described control valve is arranged on described air distribution outlet.
Boiler Mixed Burning ventilation air gas the most according to claim 1 stablizes combustion control system, it is characterised in that described first firedamp sensor is arranged on the initiating terminal of described weary wind transfer passage.
Boiler Mixed Burning ventilation air gas the most according to claim 1 stablizes combustion control system, it is characterized in that, described weary wind transfer passage is provided with conveying fan, the inlet scoop of described conveying fan is arranged towards the initiating terminal of described weary wind transfer passage, and the blowing mouth of described conveying fan is arranged towards the end end of described weary wind transfer passage.
Boiler Mixed Burning ventilation air gas the most according to claim 3 stablizes combustion control system, it is characterised in that described first firedamp sensor is between initiating terminal and the described conveying fan of described weary wind transfer passage.
Boiler Mixed Burning ventilation air gas the most according to claim 3 stablizes combustion control system, it is characterised in that described Boiler Mixed Burning ventilation air gas is stablized combustion control system and also included:
Wind pressure sensor, described wind pressure sensor is arranged in described weary wind transfer passage, and between the end end of described conveying fan and described weary wind transfer passage；
The blast detected according to described wind pressure sensor controls the blast controller of described conveying fan, and described blast controller electrically connects with described conveying fan.
Boiler Mixed Burning ventilation air gas the most according to claim 1 stablizes combustion control system, it is characterized in that, described weary wind transfer passage is additionally provided with the second firedamp sensor, described second firedamp sensor is arranged on the end end of described weary wind transfer passage, and described second firedamp sensor electrically connects with described valve positioner.
7. stablizing combustion control system according to the Boiler Mixed Burning ventilation air gas described in any one in claim 1-6, it is characterised in that the air inlet of described boiler is provided with boiler fan, described boiler fan applies negative pressure in described weary wind transfer passage.
Boiler Mixed Burning ventilation air gas the most according to claim 7 stablizes combustion control system, it is characterised in that be provided with normally closed air door on the air inlet of described boiler fan.
9. stablize combustion control system according to the Boiler Mixed Burning ventilation air gas described in any one in claim 1-6, it is characterised in that the air inlet of described boiler is provided with explosion proof door.
10. stablize combustion control system according to the Boiler Mixed Burning ventilation air gas described in any one in claim 1-6, it is characterised in that described weary wind transfer passage offers evacuation port in the position near end end.
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| CN201521129883.2U CN205447811U (en) | 2015-12-30 | 2015-12-30 | Boiler is mixed and is burnt ventilation air methane stable combustion control system |
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| CN201521129883.2U CN205447811U (en) | 2015-12-30 | 2015-12-30 | Boiler is mixed and is burnt ventilation air methane stable combustion control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485713A (en) * | 2015-12-30 | 2016-04-13 | 中国神华能源股份有限公司 | Stable combustion control system for ventilation air methane mixed in boiler |
| CN108506953A (en) * | 2018-04-11 | 2018-09-07 | 山西沁新能源集团股份有限公司 | It is a kind of to ensure flue gas ultra-clean exhaust system using boiler idle air |
-
2015
- 2015-12-30 CN CN201521129883.2U patent/CN205447811U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485713A (en) * | 2015-12-30 | 2016-04-13 | 中国神华能源股份有限公司 | Stable combustion control system for ventilation air methane mixed in boiler |
| CN108506953A (en) * | 2018-04-11 | 2018-09-07 | 山西沁新能源集团股份有限公司 | It is a kind of to ensure flue gas ultra-clean exhaust system using boiler idle air |
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