CN105181256A - Oxygen-rich combustion air leak monitoring method and system - Google Patents
Oxygen-rich combustion air leak monitoring method and system Download PDFInfo
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- CN105181256A CN105181256A CN201510501172.1A CN201510501172A CN105181256A CN 105181256 A CN105181256 A CN 105181256A CN 201510501172 A CN201510501172 A CN 201510501172A CN 105181256 A CN105181256 A CN 105181256A
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Abstract
The invention provides an oxygen-rich combustion air leak monitoring method and system. The method comprises the following steps: acquiring carbon dioxide concentration measured values of multiple monitoring points in a boiler equipment system or flue gas flow values of the multiple monitoring points, wherein the multiple monitoring points are disposed at the inlets and the outlets of multiple different devices of the boiler equipment system; and according to the multiple carbon dioxide concentration measured values or the multiple flue gas flow values, calculating air leak rates of the multiple different devices in the boiler equipment system and/or a total air leak rate of the boiler equipment system. According to the invention, air leak can be monitored, and air leak points are timely controlled according to the air leak rates of the different devices and/or the total air leak rate of the boiler equipment system which are calculated in real time, so that high-concentration enrichment of carbon dioxide is realized.
Description
Technical field
The present invention relates to Monitoring and Controlling field, particularly, relate to a kind of oxygen-enriched combusting and to leak out monitoring method and system.
Background technology
Existing collecting carbonic anhydride with seal up for safekeeping in (CarbondioxideCaptureandSequestration, CCS) technology, oxygen-enriched combusting carbon trapping technique is at cost of investment, operating cost, CO
2reduce discharging the aspects such as cost, maximization, compatibility and all there is superiority, be considered to a kind of carbon emission reduction technology with development potentiality.
For oxygen-enriched combustion technology, there is the problem of leaking out.Boiler plant system air leakage amount increases can obviously increase boiler exhaust gas loss and induced draft fan power consumption, thus reduces the economy of unit.Research shows, in oxygen-enriched combusting power plant, leaks out and often increases by 1%, and overall power plant efficiency reduces by 0.2%.In addition, the increase of system air leakage amount also can cause the concentration of carbon dioxide in flue gas to reduce, the requirement finally making gas concentration lwevel not reach to bury and utilize.This is because, when existence in boiler plant system is leaked out, because oxygen-enriched combusting adopts the mode of circulating combustion, leak out and cause N in flue gas
2content is enrichment gradually, as shown in Figure 1, and N in flue gas under long-play
2concentration is more and more higher, causes CO
2concentration does not reach requirement, and this just loses the meaning of oxygen-enriched combustion technology.
In sum, prior art lacks the monitoring to leaking out in Rich Oxygen Combustion, can not control in time to leak out a little, cause CO
2concentration does not reach requirement.
Summary of the invention
For the monitoring lacked in Rich Oxygen Combustion leaking out existed in prior art, the problem that can not control in time to leak out a little etc., the invention provides a kind of oxygen-enriched combusting to leak out monitoring method, the method comprises: gather the carbon dioxide concentration measurement value of multiple monitoring point or the flue gas flow value of multiple monitoring point in boiler plant system, the entrance and exit place of the multiple different equipment of described multiple monitoring site in described boiler plant system; And calculate the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value.
Correspondingly, present invention also offers a kind of oxygen-enriched combusting Air Leaking Monitoring System, this system comprises: gas concentration detection apparatus or flow detector, this gas concentration detection apparatus is for gathering the carbon dioxide concentration measurement value of multiple monitoring point in boiler plant system, or this flow detector is for gathering the flue gas flow value of described multiple monitoring point, the entrance and exit place of the multiple different equipment of described multiple monitoring site in described boiler plant system; And control device, for calculating the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value.
Oxygen-enriched combusting provided by the invention is adopted to leak out monitoring method and system, by gathering the carbon dioxide concentration measurement value of multiple monitoring point or the flue gas flow value (the entrance and exit place of the multiple different equipment of wherein said multiple monitoring site in described boiler plant system) of multiple monitoring point in boiler plant system, and the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system can be calculated according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value, thus monitor leaking out, control in time to leak out a little according to the air leak rate of air curtain of different equipment calculated in real time and/or total air leak rate of air curtain of boiler plant system, realize CO
2high concentration enrichment.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the schematic diagram that 26% partial pressure of oxygen oxygen-enriched combusting operating mode system air leakage affects dry flue gas concentration of component;
Fig. 2 is the schematic diagram of the example oxygen-enriched combusting Air Leaking Monitoring System according to one embodiment of the present invention; And
Fig. 3 is the process flow diagram of monitoring method of leaking out according to the example oxygen-enriched combusting of one embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is the schematic diagram that 26% partial pressure of oxygen oxygen-enriched combusting operating mode system air leakage affects dry flue gas concentration of component, as shown in Figure 1, need to control within 2.4% in 26% partial pressure of oxygen oxygen-enriched combusting operating mode (compatible with air atmosphere combustion and heat transfer performances) total system air leak rate of air curtain, carbon dioxide-enriched (CO could be obtained
2) flue gas of 80% concentration, it can thus be appreciated that the calculating of the air leak rate of air curtain of system and monitoring realize CO
2the key of high concentration enrichment.
To achieve these goals, the invention provides a kind of oxygen-enriched combusting Air Leaking Monitoring System, this system can comprise: gas concentration detection apparatus or flow detector, this gas concentration detection apparatus is for gathering the carbon dioxide concentration measurement value of multiple monitoring point in boiler plant system, it can be any device that suitably can gather gas concentration lwevel, such as cubic portable infrared flue gas analyzer etc.Such as, and this flow detector is for gathering the flue gas flow value of described multiple monitoring point, and it can be any device that suitably can gather flue gas flow, flowmeter etc.Afterwards, the data that gas concentration detection apparatus or flow detector can be collected send to (by electrical connection or wireless transmission) control device.Afterwards, control device is used for calculating the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value, thus realizes in Rich Oxygen Combustion the monitoring of leaking out.
Fig. 2 is the schematic diagram of the example oxygen-enriched combusting Air Leaking Monitoring System according to one embodiment of the present invention, the entrance and exit place of the multiple different equipment of described multiple monitoring site in described boiler plant system.Such as, as shown in Figure 2, can electric precipitator (ESP) in boiler plant system, fume desulfurizing tower (FGD), induced draft fan (IDF) the entrance and exit place of pipeline monitoring point is set, so that the gas concentration lwevel of each equipment gateway of follow-up monitoring.The monitoring point of the porch of adjacent two equipment and the monitoring point in exit can be same monitoring point, and namely the monitoring point of the monitoring point in the exit of previous equipment and the porch of a rear equipment is same monitoring point.
Preferably, consider the difference of pick-up unit susceptibility, multiple pick-up unit (such as gas concentration detection apparatus or flow detector) can be set in each monitoring point, to obtain multiple measurement data, average can got to multiple measurement data of same monitoring point to obtain more accurate measurement result afterwards.
According to one embodiment of the present invention, this system is configured to comprise gas concentration detection apparatus and control device, in this embodiment, control device can adopt the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery (electric precipitator (ESP) such as shown in Fig. 2, fume desulfurizing tower (FGD), induced draft fan (IDF)) (under supposing the isobaric condition of oxygen-enriched combustion boiler device systems, according to Carbon balance principle, be not counted in the impact of water vapour condensation etc.):
Wherein, L
iit is the air leak rate of air curtain of i-th equipment;
it is the carbon dioxide concentration measurement value of the monitoring point at i-th equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in i-th equipment exit; N is natural number.
And, adopt total air leak rate of air curtain of boiler plant system described in following formulae discovery:
Wherein, L is total air leak rate of air curtain of boiler plant system;
it is the carbon dioxide concentration measurement value of the monitoring point at first equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in N number of equipment exit; N is natural number.
Should be understood that, those skilled in the art can according to actual conditions need adopt above-mentioned formula (1) and/or (3) to calculate the described air leak rate of air curtain of multiple different equipment and/or total air leak rate of air curtain of boiler plant system, illustrated in table 1 that the above-mentioned formula of employing records the sample data of the air leak rate of air curtain of different equipment and/or total air leak rate of air curtain of boiler plant system.
Table 1 oxygen-enriched combusting leaks out Monitoring Data
(wherein #1-5 represents the label of multiple pick-up units that each monitoring point is arranged)
Afterwards, the described control device air leak rate of air curtain of described multiple different equipment that can calculate according to formula (1) and/or (3) and/or total air leak rate of air curtain of boiler plant system carry out Air leakage control operation.Such as, when described total air leak rate of air curtain exceedes system air leakage rate predetermined value, carry out Air leakage control operation, such as, seal operation is carried out to boiler plant system.Or, the arbitrary place air leak rate of air curtain in the air leak rate of air curtain of described multiple different equipment exceedes equipment air leak rate of air curtain predetermined value corresponding to this equipment, carry out Air leakage control operation.Or, above-mentioned two situations combination is monitored.The equipment air leak rate of air curtain predetermined value that wherein said multiple different equipment is corresponding can be identical or not identical, and those skilled in the art can carry out setting or selecting according to actual conditions, and the present invention does not limit this.
Such as, the air leak rate of air curtain in reference table 1, supposes that set device air leak rate of air curtain predetermined value is 2.4%, then according to above-mentioned result of calculation, control device can find that leaking out of electric precipitator is serious, in order to realize dry flue gas CO under whole process service condition
2concentration Absorbable organic halogens, certain limit (such as more than 80%), needs to be optimized to operate with Air leakage control.Or suppose that the total air leak rate of air curtain of initialization system is 2.4%, then according to above-mentioned result of calculation, control device can find that system air leakage is serious, in order to realize dry flue gas CO under whole process service condition
2concentration Absorbable organic halogens, in certain limit, needs to be optimized to operate with Air leakage control.
According to another embodiment of the invention, this system is configured to comprise flow detector and control device, and at this embodiment, control device adopts the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment; Q
iit is the flue gas flow value of the monitoring point at i-th equipment entrance place; Q
i+1it is the flue gas flow value of the monitoring point in i-th equipment exit; N is natural number.
And, adopt total air leak rate of air curtain of boiler plant system described in following formulae discovery:
Wherein, L is total air leak rate of air curtain of boiler plant system; Q
0it is the flue gas flow value of the monitoring point at first equipment entrance place; Q
nthe flue gas flow value of the monitoring point in N number of equipment exit; N is natural number.
Afterwards, the air leak rate of air curtain of described multiple different equipment that described control device can calculate according to formula (2) and/or (4) and/or total air leak rate of air curtain of boiler plant system carry out Air leakage control operation, embodiment and aforesaid embodiment similar, do not repeat them here.
Should be understood that; those skilled in the art can according to of the present invention any one that openly select in above-mentioned two kinds of embodiments; or select the combination of above-mentioned two kinds of embodiments to configure oxygen-enriched combusting Air Leaking Monitoring System, and other replacement embodiment also fall into protection scope of the present invention.
Fig. 3 is the process flow diagram of monitoring method of leaking out according to the example oxygen-enriched combusting of one embodiment of the present invention, and as shown in Figure 3, the method can comprise the following steps:
Step 1001, gathers the carbon dioxide concentration measurement value of multiple monitoring point or the flue gas flow value of multiple monitoring point in boiler plant system, the entrance and exit place of the multiple different equipment of described multiple monitoring site in described boiler plant system; And
Step 1002, calculates the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value.
Preferably, the method can also comprise: carry out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system.
Preferably, the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery is adopted:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment;
it is the carbon dioxide concentration measurement value of the monitoring point at i-th equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in i-th equipment exit; N is natural number.
Preferably, the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery is adopted:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment; Q
iit is the flue gas flow value of the monitoring point at i-th equipment entrance place; Q
i+1it is the flue gas flow value of the monitoring point in i-th equipment exit; N is natural number.
Preferably, total air leak rate of air curtain of boiler plant system described in following formulae discovery is adopted:
Wherein, L is total air leak rate of air curtain of boiler plant system;
it is the carbon dioxide concentration measurement value of the monitoring point at first equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in N number of equipment exit; N is natural number.
Preferably, total air leak rate of air curtain of boiler plant system described in following formulae discovery is adopted:
Wherein, L is total air leak rate of air curtain of boiler plant system; Q
0it is the flue gas flow value of the monitoring point at first equipment entrance place; Q
nthe flue gas flow value of the monitoring point in N number of equipment exit; N is natural number.
Preferably, carry out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system to comprise: when described total air leak rate of air curtain exceedes system air leakage rate predetermined value, carry out Air leakage control operation.
Preferably, carry out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system also to comprise: the arbitrary place air leak rate of air curtain in the air leak rate of air curtain of described multiple different equipment exceedes equipment air leak rate of air curtain predetermined value corresponding to this equipment, carry out Air leakage control operation, the equipment air leak rate of air curtain predetermined value that wherein said multiple different equipment is corresponding is the equipment air leak rate of air curtain predetermined value that identical or described multiple different equipment is corresponding is not identical.
Preferably, described Air leakage control operates to comprise and carries out seal operation to boiler plant system.
The leak out embodiment of monitoring method of above-mentioned example oxygen-enriched combusting explains all in the embodiment of above-mentioned example oxygen-enriched combusting Air Leaking Monitoring System, does not repeat them here.
Oxygen-enriched combusting provided by the invention is adopted to leak out monitoring method and system, the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system can be calculated, thus monitor leaking out, control in time to leak out a little according to the air leak rate of air curtain of different equipment calculated in real time and/or total air leak rate of air curtain of boiler plant system, realize CO
2high concentration enrichment.Enforcement of the present invention can ensure the continuous dynamic realtime monitoring of inleakage in the burning of boiler conventional air, oxygen-enriched combusting mode operation process, accurately can calculate leak out degree and key of each equipment according to Carbon balance principle leaks out a little, thus be convenient to control furnace outlet negative pressure and improve leaking out of type smoke pollutant removal equipment, realize dry flue gas CO under dry, the wet circulation whole process service condition of oxygen-enriched combusting
2concentration Absorbable organic halogens is at certain limit (such as more than 80%).
Therefore, the present invention goes for the various steam generator system needing to monitor air leak rate of air curtain, such as newly-built coal, dry, the wet combined-circulation once-through boiler system of gas oxygen-enriched combusting, dry, the wet circulation of transformation coal, gas oxygen-enriched combusting and air burning compatible steam generator system, supercharged oxygen-enriched circulating fluidized bed boiler systems etc.Above-mentioned example is only the exemplary non-limiting example for illustration of inventive concept, and the present invention does not limit this.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (18)
1. oxygen-enriched combusting leaks out a monitoring method, and it is characterized in that, the method comprises:
Gather the carbon dioxide concentration measurement value of multiple monitoring point or the flue gas flow value of multiple monitoring point in boiler plant system, the entrance and exit place of the multiple different equipment of described multiple monitoring site in described boiler plant system; And
The air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system is calculated according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value.
2. method according to claim 1, is characterized in that, the method also comprises: carry out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system.
3. method according to claim 1, is characterized in that, adopts the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment;
it is the carbon dioxide concentration measurement value of the monitoring point at i-th equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in i-th equipment exit; N is natural number.
4. method according to claim 1, is characterized in that, adopts the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment; Q
iit is the flue gas flow value of the monitoring point at i-th equipment entrance place; Q
i+1it is the flue gas flow value of the monitoring point in i-th equipment exit; N is natural number.
5. method according to claim 3, is characterized in that, adopts total air leak rate of air curtain of boiler plant system described in following formulae discovery:
Wherein, L is total air leak rate of air curtain of boiler plant system;
it is the carbon dioxide concentration measurement value of the monitoring point at first equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in N number of equipment exit; N is natural number.
6. method according to claim 4, is characterized in that, adopts total air leak rate of air curtain of boiler plant system described in following formulae discovery:
Wherein, L is total air leak rate of air curtain of boiler plant system; Q
0it is the flue gas flow value of the monitoring point at first equipment entrance place; Q
nthe flue gas flow value of the monitoring point in N number of equipment exit; N is natural number.
7. method according to claim 2, is characterized in that, carries out Air leakage control operation comprise according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system:
When described total air leak rate of air curtain exceedes system air leakage rate predetermined value, carry out Air leakage control operation.
8. method according to claim 7, is characterized in that, carries out Air leakage control operation also comprise according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system:
Arbitrary place air leak rate of air curtain in the air leak rate of air curtain of described multiple different equipment exceedes equipment air leak rate of air curtain predetermined value corresponding to this equipment, carry out Air leakage control operation, the equipment air leak rate of air curtain predetermined value that wherein said multiple different equipment is corresponding is the equipment air leak rate of air curtain predetermined value that identical or described multiple different equipment is corresponding is not identical.
9. method according to claim 8, is characterized in that, described Air leakage control operation comprises carries out seal operation to boiler plant system.
10. an oxygen-enriched combusting Air Leaking Monitoring System, is characterized in that, this system comprises:
Gas concentration detection apparatus or flow detector, this gas concentration detection apparatus is for gathering the carbon dioxide concentration measurement value of multiple monitoring point in boiler plant system, or this flow detector is for gathering the flue gas flow value of described multiple monitoring point, the entrance and exit place of the multiple different equipment of described multiple monitoring site in described boiler plant system; And
Control device, for calculating the air leak rate of air curtain of multiple different equipment described in described boiler plant system and/or total air leak rate of air curtain of boiler plant system according to multiple carbon dioxide concentration measurement value or multiple flue gas flow value.
11. systems according to claim 10, is characterized in that, described control device also for: carry out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system.
12. systems according to claim 10, is characterized in that, adopt the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment;
it is the carbon dioxide concentration measurement value of the monitoring point at i-th equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in i-th equipment exit; N is natural number.
13. systems according to claim 10, is characterized in that, adopt the air leak rate of air curtain of multiple different equipment described in boiler plant system described in following formulae discovery:
Wherein, L
iit is the air leak rate of air curtain of i-th equipment; Q
iit is the flue gas flow value of the monitoring point at i-th equipment entrance place; Q
i+1it is the flue gas flow value of the monitoring point in i-th equipment exit; N is natural number.
14. systems according to claim 12, is characterized in that, adopt total air leak rate of air curtain of boiler plant system described in following formulae discovery:
Wherein, L is total air leak rate of air curtain of boiler plant system;
it is the carbon dioxide concentration measurement value of the monitoring point at first equipment entrance place;
it is the carbon dioxide concentration measurement value of the monitoring point in N number of equipment exit; N is natural number.
15. systems according to claim 13, is characterized in that, adopt total air leak rate of air curtain of boiler plant system described in following formulae discovery:
Wherein, L is total air leak rate of air curtain of boiler plant system; Q
0it is the flue gas flow value of the monitoring point at first equipment entrance place; Q
nthe flue gas flow value of the monitoring point in N number of equipment exit; N is natural number.
16. systems according to claim 11, it is characterized in that, described control device also comprises for carrying out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system: when described total air leak rate of air curtain exceedes system air leakage rate predetermined value, carry out Air leakage control operation.
17. systems according to claim 16, it is characterized in that, described control device also also comprises for carrying out Air leakage control operation according to the calculated air leak rate of air curtain of described multiple different equipment and/or total air leak rate of air curtain of boiler plant system: the arbitrary place air leak rate of air curtain in the air leak rate of air curtain of described multiple different equipment exceedes equipment air leak rate of air curtain predetermined value corresponding to this equipment, carry out Air leakage control operation, the equipment air leak rate of air curtain predetermined value that wherein said multiple different equipment is corresponding is the equipment air leak rate of air curtain predetermined value that identical or described multiple different equipment is corresponding is not identical.
18. systems according to claim 17, is characterized in that, described Air leakage control operation comprises carries out seal operation to boiler plant system.
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Application publication date: 20151223 |