CN103776052B - The control method of a kind of fuel gas with low heat value ignition temperature and control system - Google Patents
The control method of a kind of fuel gas with low heat value ignition temperature and control system Download PDFInfo
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- CN103776052B CN103776052B CN201410049175.1A CN201410049175A CN103776052B CN 103776052 B CN103776052 B CN 103776052B CN 201410049175 A CN201410049175 A CN 201410049175A CN 103776052 B CN103776052 B CN 103776052B
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Abstract
The invention discloses control method and the control system of a kind of fuel gas with low heat value ignition temperature, this control method includes: the temperature of fuel gas with low heat value burning in collection combustion furnace；The temperature value this gathered compares with the front temperature value once gathered；According to the flow of variations in temperature regulation air, if temperature raises, then increase air mass flow, if temperature reduces, then reduce air mass flow.Air mass flow is controlled by described control method according to the temperature in combustion furnace so that in combustion furnace, the content of fuel gas with low heat value and air is in the best combustion ratio of described fuel gas with low heat value, improves the utilization rate of heat.Described control system, based on described control method, uses described control system to carry out fuel gas with low heat value ignition temperature control, it is possible to increase the utilization rate of heat.
Description
Technical field
The present invention relates to technical field of temperature control, more particularly, it relates to a kind of fuel gas with low heat value burning
The control method of temperature and control system.
Background technology
In chemical producing system, many tail gas that produce are fuel gas with low heat value, have certain heat recovery
It is worth.In order to improve energy utilization rate and reduce environmental pollution, need combustible tail gas is burnt
Process, to utilize the heat generated in combustion process, eliminate the dusty gas in tail gas simultaneously.
Combustion furnace can be used for combustion tail gas, produces steam, and its parts being filled with water are commonly referred to as pot, heating
Parts are commonly referred to as stove.Burner in tail gas boiler is the core producing steam.Tail gas is in burning
Mix with air in device, at stove chamber inner combustion after exit is lighted, thus utilize in combustion process and generate
Heat.
When combustion furnace carries out gas fuel burning, need to carry out temperature control, to ensure that combustion furnace is transported safely
OK, and ensure effective utilization of heat.Existing combustion furnace, when carrying out temperature and controlling, is only according to life
Industry is tested, and the ratio presetting tail gas and air carries out mixed combustion.
Inventor finds, the temperature-controlled process of existing combustion furnace can not accurately control air and low grade fever
The proportioning of value combustion gas, heat utilization ratio is low.
Summary of the invention
For solving above-mentioned technical problem, the present invention provides the control method of a kind of fuel gas with low heat value ignition temperature
And control system, improve the utilization rate of heat.
For achieving the above object, the present invention provides following technical scheme:
A kind of control method of fuel gas with low heat value ignition temperature, fuel gas with low heat value burning temperature in combustion furnace
The control of degree, this control method includes:
The temperature of fuel gas with low heat value burning in collection combustion furnace；
The temperature value this gathered compares with the front temperature value once gathered；
According to the flow of variations in temperature regulation air, if temperature raises, then increase air mass flow, if
Temperature reduces, then reduce air mass flow.
Preferably, in above-mentioned control method, when needs increase air mass flow, if front primary air
It is to reduce flow that flow changes, then the amplitude that this air mass flow increases reduces less than a front air mass flow
Amplitude.
Preferably, in above-mentioned control method, when needs reduce air mass flow, if front primary air
It is to increase that flow changes, then the width that the amplitude that this air mass flow reduces increases less than a front air mass flow
Degree.
Preferably, in above-mentioned control method, use air-blaster converter regulation air mass flow, logical
Cross the frequency increase air mass flow increasing described air-blaster converter, by reducing described air blast
The frequency of machine converter reduces air mass flow.
Preferably, in above-mentioned control method, the frequency range of described air-blaster converter is
0.2Hz-1Hz, including endpoint value.
Preferably, in above-mentioned control method, if ignition temperature is more than 1100 DEG C, increase air mass flow,
Making ignition temperature is 900 DEG C-1100 DEG C in ignition temperature.
Preferably, in above-mentioned control method, if ignition temperature is more than 1100 DEG C, also include:
Carry out high temperature alarm.
Present invention also offers the control system of a kind of fuel gas with low heat value ignition temperature, in combustion furnace
The control of fuel gas with low heat value ignition temperature, this control system includes:
Temperature collecting device, described temperature collecting device is fuel gas with low heat value burning in gathering combustion furnace
Temperature；
Air-flow control device, described air-flow control device is for controlling the stream of burning furnace air
Amount；
Controller, described controller is connected with described temperature collecting device, and described controller is for by this
The temperature value gathered compares with the front temperature value once gathered, and generates regulation signal, institute according to variations in temperature
State regulation signal for driving described air-flow control device that air mass flow is just regulated, if temperature
Raise, then drive described air-flow control device to increase air mass flow, if temperature reduces, then drive
Described air-flow control device reduces air mass flow.
Preferably, in above-mentioned control system, described air-flow control device is air-blaster frequency conversion
Device.
Preferably, in above-mentioned control system, also include:
Alarm device, described alarm device is connected with described controller, when temperature exceedes setting threshold value,
Described controller generates alarm signal, is used for driving described alarm device to report to the police.
From technique scheme it can be seen that control method provided by the present invention includes: gather combustion furnace
The temperature of interior fuel gas with low heat value burning；The temperature value this gathered compares with the front temperature value once gathered；
According to the flow of variations in temperature regulation air, if temperature raises, then increase air mass flow, if temperature
Reduce, then reduce air mass flow.Air mass flow is carried out by described control method according to the temperature in combustion furnace
Control so that in combustion furnace, fuel gas with low heat value and the content of air are in the optimal combustion of described fuel gas with low heat value
Burning ratio, improves the utilization rate of heat.Described control system, based on described control method, uses described
Control system carries out fuel gas with low heat value ignition temperature control, it is possible to increase the utilization rate of heat.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The flow process of the control method of a kind of fuel gas with low heat value ignition temperature that Fig. 1 provides for the embodiment of the present invention
Schematic diagram；
The structure of the control system of a kind of fuel gas with low heat value ignition temperature that Fig. 2 provides for the embodiment of the present invention
Schematic diagram.
Detailed description of the invention
The most as described in the background section, the temperature-controlled process of existing combustion furnace can not accurately control
Air and the proportioning of low-calorie fuel gas with low heat value, heat utilization ratio is low.
Need accurately to control the proportioning of fuel gas with low heat value and air, so that described fuel gas with low heat value is in
Good fired state, is in higher temperature under equipment bears load, improves heat utilization ratio.
Based on the studies above, the invention provides the control method of a kind of fuel gas with low heat value ignition temperature, institute
State fuel gas with low heat value including, but not limited to the tail gas in industrial production system, low heat value in combustion furnace
The control of fuel gas buring temperature, this control method includes: the temperature of fuel gas with low heat value burning in collection combustion furnace
Degree；
The temperature value this gathered compares with the front temperature value once gathered；
According to the flow of variations in temperature regulation air, if temperature raises, then increase air mass flow, if
Temperature reduces, then reduce air mass flow.
Air mass flow is controlled by control method of the present invention according to the temperature in combustion furnace so that combustion
In burning stove, the content of fuel gas with low heat value and air is in the best combustion ratio of described fuel gas with low heat value, improves
The utilization rate of heat.
It is above the core concept of the application, below in conjunction with the accompanying drawing in the embodiment of the present invention, to this
Technical scheme in bright embodiment is clearly and completely described, it is clear that described embodiment is only
It is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, this
The every other embodiment that field those of ordinary skill is obtained under not making creative work premise,
Broadly fall into the scope of protection of the invention.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but this
Bright other can also be used to be different from alternate manner described here implement, those skilled in the art are permissible
In the case of intension of the present invention, doing similar popularization, therefore the present invention not by following public specifically
The restriction of embodiment.
Secondly, the present invention combines schematic diagram and is described in detail, when describing the embodiment of the present invention in detail, for just
In explanation, represent that the schematic diagram of device structure can be disobeyed general ratio and be made partial enlargement, and described in show
Being intended to simply example, it should not limit the scope of protection of the invention at this.Additionally, should in actual fabrication
Comprise length, width and the three-dimensional space of height.
Based on above-mentioned thought, the embodiment of the present application provides the controlling party of a kind of fuel gas with low heat value ignition temperature
Method, the control of fuel gas with low heat value ignition temperature in combustion furnace, with reference to Fig. 1, this control method includes:
Step S11: the temperature of fuel gas with low heat value burning in collection combustion furnace.
Temperature sensor can be used to carry out temperature acquisition, described temperature sensor is arranged on described combustion furnace
Burner hearth in temperature when adopting gas combustion in combustion furnace.
Step S12: the temperature value this gathered compares with the front temperature value once gathered.
When said temperature harvester carries out temperature acquisition, be combustion furnace work whole during continue
Carry out temperature acquisition.Can set the temporal frequency of collecting temperature, the time period often crossing setting is carried out once
Temperature acquisition.
When gathering for the first time, a reference temperature can be set so that gather and this reference temperature for the first time
Relatively.Or after first time collecting temperature, giving tacit consent to a front temperature is zero, i.e. can be considered and gather for the first time
Temperature and zero balancing.
Step S13: according to the flow of variations in temperature regulation air, if temperature raises, then increases air stream
Amount, if temperature reduces, then reduces air mass flow.
Make described fuel gas with low heat value and air stoichiometry be in described low heat value by the flow of regulation air to fire
The best combustion proportioning of gas so that temperature value is higher, improves the utilization rate of heat.Preferably, this enforcement
In example, the ignition temperature in combustion furnace is stable in design temperature scope, as ignition temperature can be made at 900 DEG C
-1100 DEG C, long-time high temperature causes device damage.In the present embodiment, temperature can be made to be in 980 DEG C.
Control method described in the present embodiment is a dynamic circulation controlling means, in the whole work of combustion furnace
During work, need multi collect temperature value the most in the same time, and adopt with the last time according to current temperature value
Air mass flow is adjusted by the temperature value of collection, so that fuel gas with low heat value and the ratio of air in combustion furnace
It is in the best combustion ratio of described fuel gas with low heat value so that the temperature in combustion furnace is in described setting temperature
Degree scope, to improve the utilization rate of heat.
When carrying out described loop control, when needs increase air mass flow, if a front air mass flow
Change is to reduce flow, then the width that the amplitude that this air mass flow increases reduces less than a front air mass flow
Degree.When needs reduce air mass flow, if it is to increase that a front air mass flow changes, then this air
The amplitude that the amplitude of flow-reduction increases less than a front air mass flow.So, described low heat value can be made
The proportioning of combustion gas and air constantly levels off to the optimum proportioning of described fuel gas with low heat value burning maximum temperature, makes
Obtain ignition temperature maximum.
Air-blaster converter can be used to regulate air mass flow, by increasing described air-blaster frequency conversion
The frequency of device increases air mass flow, by reducing the frequency fall low air flow of described air-blaster converter
Amount.The frequency range of described air-blaster converter is 0.2Hz-1Hz, including endpoint value, i.e.
The regulation of every secondary frequencies is within the range.It thus is avoided that air mass flow amplitude of variation is relatively big, causes combustion furnace
There is larger fluctuation in interior temperature.
Control method described in the present embodiment is applicable to combustion gas and the direct mixed combustion of air, it is considered to combustion apparatus
Temperature capacity, therefore the maximum combustion temperature of described fuel gas with low heat value is less than 1100 DEG C, as being
Low-heating-value tail gas in industrial production system.
In industrial production system, it may occur however that gas leakage or reaction efficiency is relatively low etc. that problem causes tail
The too high levels of fuel gas in gas, and then make the highest more than 1100 DEG C of the maximum combustion temperature of tail gas
Threshold value.Now, in order to prevent device damage, when collecting temperature higher than described threshold value, need to increase
Air mass flow so that ignition temperature is 900 DEG C-1100 DEG C in ignition temperature.Meanwhile, carry out fault alarm,
To remind staff's quickly problem too high to gas content in tail gas to process, prevent fuel gas
A large amount of wastes, it is to avoid cause bigger economic loss.
When temperature is more than 1100 DEG C, can be by increasing the frequency of described air-blaster converter, once
Property be passed through excess air so that ignition temperature be less than 1100 DEG C.Described sky is regulated according to above-mentioned control method
The frequency of tympanites fan frequency converter so that temperature stabilization is at 1000 DEG C, and gas content is too high in tail gas asks
Before topic is solved, improve the utilization rate of heat as far as possible.Regulation when gas content is too high in tail gas
The frequency of described air-blaster converter, the range of accommodation of frequency is 0.5-1.5Hz, including endpoint value,
The change of the most every secondary frequencies is in such range.
The mechanism of described control method is:
One, in the case of fuel gas with low heat value with Combustion of Premixed, burning in-furnace temperature height depends on
The most appropriate with fuel gas with low heat value ratio in air, needed for air is more than combustion gas during ratio, air excess
Temperature declines, needed for air is less than combustion gas during ratio, the decline of fuel gas buring incomplete temperature (and have dirt
Dye), during so only the two ratio is moderate, temperature is the highest.And the embodiment of the present application passes through ignition temperature
Dynamically adjust the ratio of air and fuel gas with low heat value, it is possible to make the two be in appropriate ratio so that in combustion
(maximum combustion temperature threshold value less than 1100 DEG C), temperature in combustion furnace in the case of Gas content is superfluous
Degree reaches the maximum temperature of fuel gas with low heat value burning, improves heat utilization ratio.
Its two, for the tail gas of most industrial production system, use described control method enable to burning
Temperature be in 980 DEG C and its near, be i.e. in exhaust combustion maximum temperature and near, when can in tail gas
Burning gases content superfluous (as bad in industrial production system reaction or gas leakage cause gas content too high),
The maximum combustion temperature that can cause now tail gas exceedes setting threshold value, can exceed the heatproof of burner hearth refractory material
Requirement, now, reduces temperature by excess air, makes temperature below 1100 DEG C, and this situation can only
Be system run abnormal time short-term phenomenon.
By foregoing description, control method described in the embodiment of the present application enables to combustion furnace and carries out low
During calorific value fuel gas burning, on the one hand, make fuel gas with low heat value optimum with air stoichiometry so that ignition temperature
Higher, it is in the temperature range of setting, improves the utilization rate of heat, on the other hand, it is possible to occurring
When in tail gas, gas content is too high, it is to avoid cause bigger economic loss and the too high damage to equipment of temperature
Bad.
Based on above-mentioned control method, another embodiment of the application additionally provides a kind of calorific value fuel gas burning temperature
The control system of degree, the control of fuel gas with low heat value ignition temperature in combustion furnace, with reference to Fig. 2, this control
System includes: temperature collecting device 1, air-flow control device 2 and controller 3.Wherein, described
Temperature collecting device 1 and described air-flow control device 2 are all connected with described controller 3.
Wherein, described temperature collecting device 1 temperature of fuel gas with low heat value burning in gathering combustion furnace.
Described air-flow control device 2 is for controlling the flow of burning furnace air.Described controller 3 is used for
The temperature value this gathered compares with the front temperature value once gathered, and generates regulation letter according to variations in temperature
Number, described regulation signal is used for driving described air-flow control device 2 just to regulate air mass flow,
If temperature raises, then described air-flow control device 2 is driven to increase air mass flow, if temperature fall
Low, then drive described air-flow control device 2 to reduce air mass flow.
As described in above-mentioned control method embodiment, in order to avoid combustible gas in tail gas in industrial production system
Body burden is too high, and when causing maximum combustion temperature to exceed setting threshold value, equipment is chronically at high temperature and damages,
Described control system also includes: the alarm device being connected with described controller 3.When burning in-furnace temperature surpasses
When crossing above-mentioned 1100 DEG C of threshold values, described controller generates alarm signal, and described alarm signal is used for driving institute
Stating alarm device 4 to report to the police, fuel gas too high levels problem in tail gas is carried out by prompting staff
Process.
Wherein, described alarm device can be audible alarm unit or light alarm.
Control system described in the present embodiment ensure that when fuel gas with low heat value burns, low heat value combustion in combustion furnace
Gas is in burning optimum proportioning, improves heat utilization ratio.And described control system can use DCS
(Distributed Control System, dcs) realizes temperature control, convenient and swift.
Set during simultaneously for the industrial production system set, the flow of tail gas, and for air stream
Amount uses air-blaster converter, it is not necessary to traditional effusion meter, regulate valve, has saved system one-tenth
This, and decrease trouble point, beneficially system is the most properly functioning.
Emphasize particularly on different fields it should be noted that the application embodiment of the method and system embodiment describe, identical or
It is that similarity can be complementary to one another explanation.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (9)
1. a control method for fuel gas with low heat value ignition temperature, fuel gas with low heat value burning in combustion furnace
The control of temperature, it is characterised in that including:
The temperature of fuel gas with low heat value burning in collection combustion furnace；
The temperature value this gathered compares with the front temperature value once gathered；
According to the flow of variations in temperature regulation air, if temperature raises, then increase air mass flow, if
Temperature reduces, then reduce air mass flow；
When needs increase air mass flow, if it is to reduce flow that front air mass flow changes, then this
The amplitude that the amplitude that air mass flow increases reduces less than a front air mass flow.
Control method the most according to claim 1, it is characterised in that when needs reduce air mass flow
Time, if it is to increase that a front air mass flow changes, then the amplitude that this air mass flow reduces is less than previous
The amplitude that secondary air mass flow increases.
3. according to the control method described in any one of claim 1-2, it is characterised in that use air drum
Fan frequency converter regulation air mass flow, increases air by the frequency increasing described air-blaster converter
Flow, reduces air mass flow by the frequency reducing described air-blaster converter.
Control method the most according to claim 3, it is characterised in that described air-blaster frequency conversion
The frequency range of device is 0.2Hz-1Hz, including endpoint value.
Control method the most according to claim 1, it is characterised in that if ignition temperature exceedes
1100 DEG C, increase air mass flow so that ignition temperature is between 900 DEG C-1100 DEG C.
Control method the most according to claim 5, it is characterised in that if ignition temperature exceedes
1100 DEG C, also include:
Carry out high temperature alarm.
7. a control system for fuel gas with low heat value ignition temperature, fuel gas with low heat value burning in combustion furnace
The control of temperature, it is characterised in that including:
Temperature collecting device, described temperature collecting device is fuel gas with low heat value burning in gathering combustion furnace
Temperature；
Air-flow control device, described air-flow control device is for controlling the stream of burning furnace air
Amount；
Controller, described controller is connected with described temperature collecting device, and described controller is for by this
The temperature value gathered compares with the front temperature value once gathered, and generates regulation signal, institute according to variations in temperature
State regulation signal for driving described air-flow control device that air mass flow is just regulated, if temperature
Raise, then drive described air-flow control device to increase air mass flow, if temperature reduces, then drive
Described air-flow control device reduces air mass flow；
When needs increase air mass flow, if it is to reduce flow that front air mass flow changes, then this
The amplitude that the amplitude that air mass flow increases reduces less than a front air mass flow.
Control system the most according to claim 7, it is characterised in that described air flow control fills
It is set to air-blaster converter.
Control system the most according to claim 7, it is characterised in that also include:
Alarm device, described alarm device is connected with described controller, when temperature exceedes setting threshold value,
Described controller generates alarm signal, is used for driving described alarm device to report to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410049175.1A CN103776052B (en) | 2014-02-12 | 2014-02-12 | The control method of a kind of fuel gas with low heat value ignition temperature and control system |
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| CN201410049175.1A CN103776052B (en) | 2014-02-12 | 2014-02-12 | The control method of a kind of fuel gas with low heat value ignition temperature and control system |
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| CN103776052B true CN103776052B (en) | 2016-08-17 |
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| CN1611838A (en) * | 2003-10-30 | 2005-05-04 | 乐金电子(天津)电器有限公司 | Burner air amount control device and air amount control method |
| JP2008232501A (en) * | 2007-03-19 | 2008-10-02 | Ngk Insulators Ltd | Air-fuel ratio control system for combustion heating furnace |
| CA2688141A1 (en) * | 2007-06-11 | 2008-12-18 | George C. Dusatko | Use of hydrocarbon emulsions as a reburn fuel to reduce nox emissions |
| JP4413249B2 (en) * | 2007-07-11 | 2010-02-10 | 太陽築炉工業株式会社 | Cremation furnace combustion control system and cremation furnace combustion control method |
| US8430665B2 (en) * | 2008-02-25 | 2013-04-30 | General Electric Company | Combustion systems and processes for burning fossil fuel with reduced nitrogen oxide emissions |
| CN102374525A (en) * | 2010-08-12 | 2012-03-14 | 上海尚实能源科技有限公司 | Oxygen-supplementation-type fume gas circulation combustion device |
| CN102748774B (en) * | 2012-07-17 | 2015-05-13 | 中昊晨光化工研究院有限公司 | Burning furnace, burning control method and burning control device |
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