CN211176881U - Medium flow measuring system of oxygen-enriched combustion boiler - Google Patents
Medium flow measuring system of oxygen-enriched combustion boiler Download PDFInfo
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- CN211176881U CN211176881U CN201921651402.2U CN201921651402U CN211176881U CN 211176881 U CN211176881 U CN 211176881U CN 201921651402 U CN201921651402 U CN 201921651402U CN 211176881 U CN211176881 U CN 211176881U
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- medium flow
- air
- flue gas
- medium
- measuring system
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 46
- 239000001301 oxygen Substances 0.000 title claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000003546 flue gas Substances 0.000 claims abstract description 73
- 238000005259 measurement Methods 0.000 claims abstract description 45
- 239000000779 smoke Substances 0.000 claims abstract description 36
- 230000003068 static effect Effects 0.000 claims description 22
- 239000003245 coal Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model provides an oxygen boosting burning boiler medium flow measurement system, include: the system comprises an oxygen-enriched combustion boiler air smoke system, a primary air medium flow measuring system, a secondary air medium flow measuring system and a circulating flue gas medium flow measuring system; the secondary air medium flow measuring system comprises a secondary air main air channel medium flow measuring system and a secondary air sub-air channel medium flow measuring system; the circulating flue gas medium flow measuring system comprises a wet flue gas recirculation channel measuring system and a dry flue gas recirculation channel measuring system; the primary air medium flow measuring system, the secondary air medium flow measuring system and the circulating flue gas medium flow measuring system send measured medium flow parameters to a medium flow calculating system so as to obtain the medium flow of the air-smoke system of the oxygen-enriched combustion boiler. Through setting up air medium flow measurement system, overgrate air medium flow measurement system, circulation flue gas medium flow measurement system, improved oxygen boosting combustion boiler wind smoke system medium flow measurement's accuracy.
Description
Technical Field
The utility model relates to a flow measurement field, very much relate to a medium flow measurement system for oxygen boosting burning boiler wind cigarette system.
Background
The oxygen-enriched combustion boiler is a boiler system which is based on the existing power station boiler system, oxygen is used for replacing combustion air, and meanwhile flue gas circulation is combined to obtain flue gas (up to 90%) rich in high-concentration CO2, CO2 can be sealed or recycled at low cost, and the existing common oxygen-enriched combustion pulverized coal boiler air-flue system is shown in figure 1.
In a traditional air-smoke system of a pulverized coal boiler of a power station, a medium in a primary air system and a secondary air system is air, and a medium in the smoke system is smoke produced by burning pulverized coal in a hearth and air leakage of a flue. The medium flow measurement of the air-smoke system only measures the primary air flow and the secondary air flow generally, and because the primary air medium and the secondary air medium are air, the dynamic pressure, the static pressure and the temperature of the air in the primary air channel and the secondary air channel can be calculated by measuring the dynamic pressure, the static pressure and the temperature of the air in the primary air channel and the secondary air channelAnd obtaining the density and the speed of the medium, and further obtaining the mass flow of the medium according to the size of the air channel. However, because of the smoke circulation of the oxygen-enriched combustion pulverized coal boiler, the recirculated smoke and the injected oxygen are added into a primary air system and a secondary air system in an air-smoke system, a medium is changed into the smoke with higher oxygen concentration from air, and the CO in the recirculated smoke is gradually increased along with the gradual increase of the operation time of the boiler2The concentration of the smoke is gradually increased, namely the components of the smoke in the primary air system and the secondary air system are continuously changed, the change of the components of the smoke can lead to the change of the density of the smoke, and further the measurement of the medium flow of the air-smoke system is influenced, so that the medium flow of the air-smoke system of the oxygen-enriched combustion boiler can not be accurately measured only by measuring the flow of the smoke in the primary air system and the secondary air system.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the application provides an oxygen boosting burning boiler medium flow measurement system, not only can measure once wind medium flow and overgrate air medium flow, can also measure circulation flue gas medium flow, consequently, has improved oxygen boosting burning boiler wind smoke system medium flow measurement's accuracy.
In order to solve the technical problem, the application provides the following technical scheme:
in a first aspect, the present application provides an oxycombustion boiler medium flow measurement system, comprising:
an oxygen-enriched combustion boiler air-smoke system;
the primary air medium flow measuring system is positioned in a channel between the junction of a cold primary air channel and a hot primary air channel of the air-smoke system of the oxygen-enriched combustion boiler and the inlet of the coal mill;
the secondary air medium flow measuring system comprises a secondary air main air channel medium flow measuring system and a secondary air branch air channel medium flow measuring system which are positioned at the outlet of the air preheater;
the system comprises a circulating flue gas medium flow measuring system, a wet flue gas recirculation channel measuring system and a dry flue gas recirculation channel measuring system; the wet flue gas recirculation channel measuring system is arranged on a flue gas recirculation channel from a desulfurization system outlet of an air flue system of the oxygen-enriched combustion boiler to an inlet of a blower, and the dry flue gas recirculation channel measuring system is arranged on a flue gas recirculation channel from a condenser outlet of the air flue system of the oxygen-enriched combustion boiler to an inlet of a primary fan;
and the primary air medium flow measuring system, the secondary air medium flow measuring system and the circulating flue gas medium flow measuring system send the measured medium flow parameters to a medium flow calculating system so as to obtain the medium volume flow and the mass flow of the air-flue system of the oxygen-enriched combustion boiler.
Further, primary air medium flow measurement system, secondary air medium flow measurement system and circulation flue gas medium flow measurement system all include: the device comprises a medium dynamic pressure measuring device, a medium static pressure measuring device, a medium temperature measuring device and a smoke component measuring device.
Further, the primary air medium flow measuring system is arranged between the primary air oxygen injection point and the coal mill.
Further, the secondary air medium flow measuring system is arranged between the secondary air oxygen injection point and the hearth.
Further, the medium dynamic pressure measuring device transmits the measured medium dynamic pressure information to the medium flow calculating system through the transmitter.
Further, the medium static pressure measuring device transmits the measured medium static pressure information to the medium flow calculating system through the transmitter.
Furthermore, the medium dynamic pressure measuring device is an array type backrest pipe dynamic pressure measuring element.
Further, the medium static pressure measuring device is a static pressure measuring element.
Further, the medium temperature measuring device is a thermocouple.
Further, the smoke component measuring device is a smoke component analysis instrument.
According to the technical scheme, the utility model provides an oxygen boosting combustion boiler medium flow measurement system, through setting up primary air medium flow measurement system, the total wind channel medium flow measurement system of overgrate air, overgrate air divides wind channel medium flow measurement system, wet flue gas recirculation channel measurement system and dry flue gas recirculation channel measurement system, not only can measure primary air medium flow and overgrate air medium flow, can also measure circulation flue gas medium flow, therefore, oxygen boosting combustion boiler wind flue gas system medium flow measurement's accuracy has been improved, the economic nature and the security of oxygen boosting combustion boiler operation have been improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a conventional air-smoke system of an oxygen-enriched combustion pulverized coal boiler.
FIG. 2 is a schematic diagram of a flow measurement system of a medium of an oxyfuel combustion boiler in an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a primary medium flow measurement system in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
FIG. 2 is a schematic view of a flow measurement system of a medium of an oxyfuel combustion boiler in an embodiment of the present application, and as shown in FIG. 2, the flow measurement system of the medium of the oxyfuel combustion boiler comprises: the system comprises an oxygen-enriched combustion boiler air smoke system, a primary air medium flow measuring system 12, a secondary air medium flow measuring system and a circulating flue gas medium flow measuring system.
Specifically, as shown in fig. 2, the oxyfuel combustion boiler flue gas system includes: the device comprises a hearth 1, a denitration system 2, an air preheater 3, a dust remover 4, an induced draft fan 5, a desulfurization system 6, a condenser 7, a chimney 8, a blower 9, a primary air fan 10 and a coal pulverizer 11. The system comprises a hearth 1, a denitration system 2, an air preheater 3, a dust remover 4, an induced draft fan 5, a desulfurization system 6, a condenser 7 and a chimney 8 which are sequentially connected in series through pipelines, and a coal mill 11 is connected with the hearth 1 through a pipeline; the outlet of the desulfurization system 6 is connected with the inlet of a blower 9 through a wet flue gas recirculation channel 301, and the outlet of the blower 9 is connected with the air preheater 3; the outlet of the condenser 7 is connected with the inlet of the primary air fan 10 through a dry flue gas recirculation channel 302, the outlet of the primary air fan 10 is connected with the air preheater 3 and is connected with the coal pulverizer 11 through a cold primary air duct 101; the air preheater 3 is connected with the coal mill 11 through a primary hot air duct 102 and is connected with the furnace 1 through a secondary hot air duct, wherein the secondary hot air duct comprises a main hot secondary air duct 201 and a secondary hot air duct 202.
After the flue gas generated by the hearth 1 passes through the denitration system 2, the air preheater 3, the dust remover 4, the induced draft fan 5 and the desulfurization system 6, a part of the flue gas enters the blower 9 through the wet flue gas recirculation channel 301, and the flue gas is returned to the hearth 1 through the air preheater 3 by the blower 9; the other part of the flue gas enters a condenser 7, the flue gas from the condenser 7 is changed into dry flue gas, one part of the dry flue gas is directly discharged through a chimney 8, the other part of the dry flue gas enters a primary fan 10 through a dry flue gas recirculation channel 302, and the flue gas is sent back to the hearth 1 through an air preheater 3 and a coal pulverizer 11 by the primary fan.
Specifically, as shown in fig. 2, a part of dry flue gas sent out by the primary air fan 10 enters the hot primary air duct 102 after being heated by the air preheater 3, another part of dry flue gas directly enters the cold primary air duct 101 without passing through the air preheater 3, and the flue gas passing through the hot primary air duct 102 and the flue gas passing through the cold primary air duct 101 join at the cold primary air duct 101 and the hot primary air duct 102A of the oxygen-enriched combustion boiler air-smoke system and then enter the coal pulverizer 11; the primary air medium flow measuring system 12 is arranged in a passage between the junction A and the inlet of the coal mill and is positioned between the primary air oxygen injection point and the coal mill 11.
As shown in fig. 2, the wet flue gas sent out by the blower 9 is heated by the air preheater 3, and then enters the furnace chamber through the main hot secondary air duct 201 and the sub hot secondary air ducts 202, and the plurality of sub hot secondary air ducts 202 are connected to the main hot secondary air duct 201 through the duct elbows 17. The secondary air medium flow measuring system comprises a secondary air main air channel medium flow measuring system 13 and a secondary air branch air channel medium flow measuring system 14, wherein the secondary air main air channel medium flow measuring system 13 is located between a secondary air oxygen injection point and an air channel elbow 17, and the secondary air branch air channel medium flow measuring system 14 is located between the air channel elbow and a hearth.
As shown in fig. 2, the flow measuring system of the circulating flue gas medium comprises a wet flue gas recirculation channel measuring system 15 and a dry flue gas recirculation channel measuring system 16, and the flow of the flue gas medium before entering the secondary air duct can be accurately measured by arranging the wet flue gas recirculation channel measuring system 15 on the wet flue gas recirculation channel 301 from the outlet of the desulfurization system 6 of the air-flue system of the oxygen-enriched combustion boiler to the inlet of the blower 9; by arranging the dry flue gas recirculation channel measuring system 16 on the dry flue gas recirculation channel 302 from the outlet of the condenser 7 of the air flue system of the oxyfuel combustion boiler to the inlet of the primary air fan 10, the flow of the flue gas medium before entering the primary air channel can be accurately measured.
The primary air medium flow measuring system 12, the secondary air medium flow measuring system and the circulating flue gas medium flow measuring system can measure and obtain medium dynamic pressure delta p and medium static pressure psThe medium temperature t, the flue gas concentration C and the like, and can be sent to a medium flow calculation system for calculation.
Wherein the flue gas concentration comprises oxygen concentration
Concentration of carbon dioxide
Carbon monoxide concentration CCOWater vapor concentration
Nitric oxide concentration CNONitrogen concentration
And sulfur dioxide concentration
The flow measurement system utilizes the obtained atmospheric pressure paDynamic pressure of medium, delta p, static pressure, psCalculating the density rho of the smoke according to the temperature t and the smoke componentsyAnd velocity vyCalculating to obtain the volume flow V of the medium by combining the sectional area S of the channelyAnd mass flow rate MyThe calculation process of the medium flow calculation system is as follows:
Vy＝νy×S；
My＝ρy×Vy。
through set up primary air medium flow measurement system, overgrate air medium flow measurement system and circulation flue gas medium flow measurement system on oxygen boosting burning boiler wind cigarette system, not only measured primary air medium flow and overgrate air medium flow, still measured circulation flue gas medium flow, consequently improved oxygen boosting burning boiler wind cigarette system medium flow measurement's accuracy.
In one embodiment, as shown in fig. 3, the primary air medium flow measuring system 12 includes a medium dynamic pressure measuring device 310, a medium static pressure measuring device 320, a medium temperature measuring device 330, and a flue gas component measuring device 340, which are respectively used for acquiring dynamic pressure, static pressure, temperature, and flue gas component of flue gas. The secondary air flow measurement system and the circulating flue gas flow measurement system both include the same devices as the primary air flow measurement system 12 shown in fig. 3 and have the same measurement functions, and therefore, the description thereof is not repeated.
In one embodiment, as shown in fig. 2, the primary air medium flow measuring system 12 is disposed between the primary air oxygen injection point and the coal pulverizer, and is at a distance of at least 3m from the oxygen injection point.
In one embodiment, as shown in fig. 2, the total flow measuring system 13 of the secondary air duct medium is disposed between the oxygen injection point of the secondary air and the elbow, and the distance from the oxygen injection point is at least 3 m; the secondary air-distributing duct medium flow measuring system 14 is arranged between the duct elbow 17 and the hearth 1, and the distance between the secondary air-distributing duct medium flow measuring system and the duct elbow is at least 1 m.
In one embodiment, the medium dynamic pressure measuring device measures medium dynamic pressure information by using a dynamic pressure measuring element installed in the channel, and transmits the medium dynamic pressure information to the medium flow calculating system by using the transmitter.
In one embodiment, the medium static pressure measuring device adopts a static pressure measuring device vertically arranged on the channel to measure medium static pressure information and transmits the static pressure information to the flow calculation system by using the transmitter.
In one embodiment, the medium dynamic pressure measuring device is an array type backrest tube dynamic pressure measuring element.
In one embodiment, the static dielectric pressure measuring device is a static pressure measuring element.
In one embodiment, the medium temperature measuring device is a thermocouple.
In one embodiment, the flue gas component measuring device is a flue gas component analyzer.
The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. An oxycombustion boiler medium flow measurement system, comprising:
an oxygen-enriched combustion boiler air-smoke system;
the primary air medium flow measuring system is positioned in a channel between the junction of a cold primary air channel and a hot primary air channel of the oxygen-enriched combustion boiler air smoke system and the inlet of the coal mill;
the secondary air medium flow measuring system comprises a secondary air main air channel medium flow measuring system and a secondary air branch air channel medium flow measuring system which are positioned at the outlet of the air preheater;
the system comprises a circulating flue gas medium flow measuring system, a wet flue gas recirculation channel measuring system and a dry flue gas recirculation channel measuring system; the wet flue gas recirculation channel measuring system is arranged on a flue gas recirculation channel from a desulfurization system outlet of the oxygen-enriched combustion boiler air smoke system to an inlet of a blower, and the dry flue gas recirculation channel measuring system is arranged on a flue gas recirculation channel from a condenser outlet of the oxygen-enriched combustion boiler air smoke system to an inlet of a primary fan;
the primary air medium flow measuring system, the secondary air medium flow measuring system and the circulating flue gas medium flow measuring system send measured medium flow parameters to a medium flow calculating system so as to obtain the medium volume flow and the mass flow of the oxygen-enriched combustion boiler air smoke system.
2. An oxycombustion boiler medium flow measurement system according to claim 1, characterized in that the primary air medium flow measurement system, secondary air medium flow measurement system and circulating flue gas medium flow measurement system each comprise: the device comprises a medium dynamic pressure measuring device, a medium static pressure measuring device, a medium temperature measuring device and a smoke component measuring device.
3. An oxycombustion boiler medium flow measurement system according to claim 1, characterized in that the primary air medium flow measurement system is arranged between primary air oxygen injection point and the coal pulverizer.
4. An oxycombustion boiler medium flow measurement system according to claim 1, characterized in that the secondary air medium flow measurement system is arranged between the secondary air oxygen injection point and the furnace.
5. An oxycombustion boiler medium flow measuring system according to claim 2, characterized in that the medium dynamic pressure measuring device transmits the measured medium dynamic pressure information to the medium flow calculating system via a transmitter.
6. An oxycombustion boiler medium flow measuring system according to claim 2, characterized in that the medium static pressure measuring device transmits the measured medium static pressure information to the medium flow calculating system via a transmitter.
7. An oxycombustion boiler medium flow measuring system according to claim 2, characterized in that the medium dynamic pressure measuring device is an array-type back-rest tube dynamic pressure measuring element.
8. An oxycombustion boiler medium flow measuring system according to claim 2, characterized in that the medium static pressure measuring device is a static pressure measuring element.
9. An oxycombustion boiler medium flow measuring system according to claim 2, characterized in that the medium temperature measuring device is a thermocouple.
10. An oxycombustion boiler medium flow measuring system according to claim 2, characterized in that the flue gas composition measuring device is a flue gas composition analysis instrument.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137624A (en) * | 2021-04-02 | 2021-07-20 | 武瑞香 | Energy-conserving device that utilizes of thermal power plant's wind cigarette system |
| CN114397069A (en) * | 2022-01-05 | 2022-04-26 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of air preheater with two bins |
| CN114414163A (en) * | 2022-01-05 | 2022-04-29 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of three-bin air preheater |
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2019
- 2019-09-29 CN CN201921651402.2U patent/CN211176881U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137624A (en) * | 2021-04-02 | 2021-07-20 | 武瑞香 | Energy-conserving device that utilizes of thermal power plant's wind cigarette system |
| CN114397069A (en) * | 2022-01-05 | 2022-04-26 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of air preheater with two bins |
| CN114414163A (en) * | 2022-01-05 | 2022-04-29 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of three-bin air preheater |
| CN114397069B (en) * | 2022-01-05 | 2024-02-02 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of air preheater with two bins |
| CN114414163B (en) * | 2022-01-05 | 2024-02-02 | 华北电力科学研究院有限责任公司 | Method and device for determining air leakage rate of air preheater with three bins |
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