CN112797440A - Oxygen-enriched combustion control system of heating furnace and control method thereof - Google Patents
Oxygen-enriched combustion control system of heating furnace and control method thereof Download PDFInfo
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- CN112797440A CN112797440A CN202110054690.9A CN202110054690A CN112797440A CN 112797440 A CN112797440 A CN 112797440A CN 202110054690 A CN202110054690 A CN 202110054690A CN 112797440 A CN112797440 A CN 112797440A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 195
- 239000001301 oxygen Substances 0.000 title claims abstract description 195
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 195
- 238000010438 heat treatment Methods 0.000 title claims abstract description 92
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 description 18
- 239000012535 impurity Substances 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
Abstract
The invention discloses a heating furnace oxygen-enriched combustion control system and a control method thereof, and the heating furnace oxygen-enriched combustion control system comprises an oxygen source, a second adjusting device, a first filtering device, a pressure reducing device, a cutting device, a metering device, a third adjusting device, a mixer and a power device which are sequentially communicated with the oxygen source until the oxygen source is communicated with a heating furnace, wherein the first adjusting device is arranged between the second adjusting device and the oxygen source, a pressure sensor is arranged between the second adjusting device and the first filtering device, an external gas communication pipeline is arranged between the third adjusting device and the mixer, the gas of the third adjusting device and the gas of the external gas communication pipeline enter the mixer, and an oxygen content measuring device is arranged between the power device and the heating furnace; the device also comprises a control device, wherein the control device is in signal connection with the first adjusting device, the second adjusting device, the pressure sensor, the cutting device, the metering device, the third adjusting device and the oxygen content measuring device. The resource waste is avoided, the oxygen flow control of the heating furnace in the oxygen-enriched combustion process is realized, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of oxygen-enriched combustion control, in particular to an oxygen-enriched combustion control system of a heating furnace and a control method thereof.
Background
At present, the fuel used by the industrial heating furnace in the refinery is refinery dry gas, fuel oil and the like, and the combustion supporter of the heating furnace is oxygen in the air. Air is generally blown into a fire pan of a heating furnace by a blower to be mixed with fuel, and then the air is combusted in a hearth of the heating furnace to provide heat energy for the device.
As the prior art adopts air as combustion-supporting gas, the content of nitrogen in the air is about 78 percent, the nitrogen is inert gas and does not participate in combustion, the nitrogen entering a heating furnace can be heated from normal temperature to 150-500 ℃ and discharged into the atmosphere along with flue gas, and the part of the nitrogen takes away a large part of heat of the heating furnace, thereby influencing the thermal efficiency of the heating furnace.
Meanwhile, a refinery and chemical plant usually has an air separation unit, a pressure swing adsorption nitrogen making machine in the air separation unit adopts air in the atmosphere as a raw material to prepare required gas nitrogen, and the rest product is oxygen, so that waste is caused.
Moreover, the oxygen-enriched combustion of the existing heating furnace has a large risk in the process of conveying and controlling oxygen because the process is immature, so that the oxygen-enriched combustion cannot be widely applied.
Therefore, how to provide a heating furnace oxycombustion control system to avoid resource waste, and realize oxygen flow control of the heating furnace in the oxycombustion process, and improve safety is a technical problem to be solved urgently by those skilled in the art at present.
Disclosure of Invention
In view of this, the present invention provides an oxygen-enriched combustion control system for a heating furnace, so as to avoid resource waste, achieve oxygen flow control during oxygen-enriched combustion of the heating furnace, and improve safety. The invention also aims to provide an oxygen-enriched combustion control method for the heating furnace.
In order to achieve the purpose, the invention provides the following technical scheme:
an oxygen-enriched combustion control system of a heating furnace comprises an oxygen source, a second adjusting device, a first filtering device, a pressure reducing device, a cutting device, a metering device, a third adjusting device, a mixer and a power device which are sequentially communicated with the oxygen source until the oxygen source is communicated with the heating furnace,
a first adjusting device is arranged on a communicating pipeline between the second adjusting device and the oxygen source, one end of the first adjusting device is a discharge end,
a pressure sensor is arranged between the second adjusting device and the first filtering device,
an external air communication pipeline is arranged between the third adjusting device and the mixer, the gas flowing out of the third adjusting device and the gas flowing out of the external air communication pipeline enter the mixer to be mixed,
an oxygen content measuring device is arranged between the power device and the heating furnace;
the device also comprises a control device which is in signal connection with the first adjusting device, the second adjusting device, the pressure sensor, the cutting device, the metering device, the third adjusting device and the oxygen content measuring device,
the control device controls the opening and closing of the first adjusting device and the second adjusting device according to the signal of the pressure sensor,
the control device controls the opening and closing of the cutting device according to the signal of the oxygen content measuring device and adjusts the opening degree of the first adjusting device.
Preferably, the oxygen source is an air separation plant nitrogen generator.
Preferably, the above-mentioned control device is one, or,
the number of the control devices is two, one of the control devices controls the opening and closing of the first adjusting device and the second adjusting device according to the signal of the pressure sensor,
the other control device controls the opening and closing of the cutting device according to the signal of the oxygen content measuring device and adjusts the opening degree of the first adjusting device.
Preferably, the first adjusting device and the second adjusting device are adjusting valves,
the third adjusting device is an adjusting valve group,
the metering device is a flow meter valve group,
the cutting device is a cut-off valve,
the power device is a blower, and the power device is a blower,
the oxygen content measuring device is an oxygen analyzer.
Preferably, the first filter device is a Y-type filter, and the number of filter meshes is 30-200 meshes.
The invention also provides a method for controlling the oxygen-enriched combustion of the heating furnace, which is based on the oxygen-enriched combustion control system of the heating furnace,
under the normal production working condition, the first adjusting device is closed, the second adjusting device is opened, and the cutting device is opened;
when the current pressure in the pipeline measured by the pressure sensor is higher than a first value, the control device controls the first adjusting device to be started;
when the current oxygen content in the pipeline measured by the oxygen content measuring device is higher than a second numerical value, the control device controls the cut-off device to be closed and controls the first adjusting device to be opened.
Preferably, the control device further controls the opening degree of the first adjusting device when the current pressure in the pipeline measured by the pressure sensor is higher than a first value,
and when the current oxygen content in the pipeline measured by the oxygen content measuring device is higher than a second numerical value, the control device also controls the opening degree of the first adjusting device.
Preferably, the second regulating device controls the current pressure in the pipeline to be 0.2-0.5 Mpa.
Preferably, the oxygen content of the gas entering the furnace is between 18% and 100%.
Preferably, the oxygen content of the gas entering the furnace is 21% to 31%.
The invention provides an oxygen-enriched combustion control system of a heating furnace, which comprises the following components in use:
under the normal production working condition, the first adjusting device is closed, the second adjusting device is opened, and the cutting device is opened;
when the current pressure in the pipeline measured by the pressure sensor is higher than a first value, the control device controls the first adjusting device to be started;
when the current oxygen content in the pipeline measured by the oxygen content measuring device is higher than a second numerical value, the control device controls the cut-off device to be closed and controls the first adjusting device to be opened.
Thereby avoiding resource waste, realizing the oxygen flow control of the heating furnace in the oxygen-enriched combustion process and improving the safety.
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 introduced below, and it is obvious that the drawings in the following description are 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 connection diagram of a oxycombustion control system for a heating furnace according to an embodiment of the present invention.
In the above FIG. 1:
the nitrogen production device comprises an air separation plant nitrogen production machine 1, a first adjusting device 2, a second adjusting device 3, a pressure sensor 4, a first filtering device 5, a pressure reducing device 6, a cutting device 7, a control device 8, a metering device 9, a third adjusting device 10, a second filtering device 11, a mixer 12, a power device 13, an oxygen content measuring device 14 and a heating furnace 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic connection diagram of an oxycombustion control system of a heating furnace according to an embodiment of the present invention.
The invention provides a heating furnace oxygen-enriched combustion control system, which comprises an oxygen source, a second adjusting device 3, a first filtering device 5, a pressure reducing device 6, a cutting device 7, a metering device 9, a third adjusting device 10, a mixer 12 and a power device 13 which are sequentially communicated from the oxygen source until the oxygen source is communicated with a heating furnace 15,
a first adjusting device 2 is arranged on a communicating pipeline between the second adjusting device 3 and the oxygen source, one end of the first adjusting device 2 is a discharge end,
a pressure sensor 4 is arranged between the second adjusting device 3 and the first filter device 5,
an external air communication pipeline is arranged between the third adjusting device 10 and the mixer 12, the gas flowing out of the third adjusting device 10 and the gas flowing out of the external air communication pipeline enter the mixer 12 to be mixed,
an oxygen content measuring device 14 is arranged between the power device 13 and the heating furnace 15;
and a control device 8, wherein the control device 8 is in signal connection with the first adjusting device 2, the second adjusting device 3, the pressure sensor 4, the cutting device 7, the metering device 9, the third adjusting device 10 and the oxygen content measuring device 14, signal lines are shown by dotted lines in figure 1,
the control device 8 controls the opening and closing of the first adjusting device 2 and the second adjusting device 3 according to the signal of the pressure sensor 4,
the control device 8 controls the opening and closing of the shut-off device 7 and adjusts the opening degree of the first adjusting device 2 in accordance with the signal of the oxygen content measuring device 14.
The invention provides an oxygen-enriched combustion control system of a heating furnace, which comprises the following components in use:
under the normal production working condition, the first adjusting device 2 is closed, the second adjusting device 3 is opened, the cutting device 7 is opened, oxygen from an oxygen source passes through the second adjusting device 3, so that the pressure is not higher than a first value and can also be not lower than a third value at the same time, for example, the pressure of an oxygen pipeline is controlled to be between 0.2 and 0.5Mpa, then the oxygen is filtered by the first filtering device 5, solid substances in the oxygen are filtered, the oxygen is decompressed by the decompressing valve, namely the decompressing device 6, for example, the pressure can be decompressed to be between 0 and 500kpa, then the oxygen enters the metering device 9 for metering the oxygen by the cutting device 7, then the oxygen is subjected to flow adjustment by the third adjusting device 10, and is merged with air before entering the mixer 12 and then is uniformly mixed after entering the mixer 12, a second filtering device 11 can be arranged on an external gas communicating pipeline for filtering solid impurities of the air, the oxygen-enriched air after being uniformly mixed enters the heating furnace 15 under the driving of the power device 13, and the oxygen-enriched air is mixed with fuel in the heating furnace 15 and then is combusted;
when the current pressure in the pipeline measured by the pressure sensor 4 is higher than a first value, the control device 8 controls the first adjusting device 2 to be opened, oxygen is discharged from the discharge end and can be directly discharged into the atmosphere, or the oxygen can be collected by a container or discharged to other aerobic equipment, so that the current pipeline pressure is in a controllable state, and the safety is improved;
when the current oxygen content in the pipeline measured by the oxygen content measuring device 14 is higher than the second value, the control device 8 controls the cut-off device 7 to be closed and controls the first adjusting device 2 to be opened, and after the cut-off device 7 is closed, the oxygen source is cut off, so that the pipeline pressure at the upstream of the cut-off device 7 is easily increased, and at the moment, the first adjusting device 2 is opened to discharge oxygen.
Thereby avoiding resource waste, realizing the oxygen flow control of the heating furnace 15 in the oxygen-enriched combustion process and improving the safety.
Specifically, the oxygen source is an air separation plant nitrogen generator 1.
Specifically, the control device 8 is one, or,
two control devices 8 are provided, wherein one control device controls the opening and closing of the first adjusting device 2 and the second adjusting device 3 according to the signal of the pressure sensor 4,
the other control device 8 controls the opening and closing of the shut-off device 7 and adjusts the opening of the first adjusting device 2 according to the signal of the oxygen content measuring device 14.
In particular, the first adjusting device 2 and the second adjusting device 3 are adjusting valves,
the third regulating device 10 is a regulating valve block,
the metering device 9 is a flow meter valve group,
the cut-off device 7 is a cut-off valve,
the power unit 13 is a blower and,
the oxygen content measuring device 14 is an oxygen analyzer.
Wherein, the first filtering device 5 is a Y-shaped filter, and the mesh number of the filtering net is 30-200 meshes.
The embodiment of the invention also provides a method for controlling the oxygen-enriched combustion of the heating furnace, which is based on the oxygen-enriched combustion control system of the heating furnace in any one of the embodiments,
under the normal production working condition, the first adjusting device 2 is closed, the second adjusting device 3 is opened, and the cutting device 7 is opened;
when the current pressure in the pipeline measured by the pressure sensor 4 is higher than a first value, the control device 8 controls the first adjusting device 2 to be opened;
when the current oxygen content in the pipeline measured by the oxygen content measuring device 14 is higher than a second value, the control device 8 controls the cut-off device 7 to be closed and controls the first adjusting device 2 to be opened.
In order to further optimize the above solution, when the current pressure in the pipeline measured by the pressure sensor 4 is higher than the first value, the control device 8 also controls the opening degree of the first regulating device 2,
the control device 8 also controls the opening degree of the first regulating device 2 when the current oxygen content in the pipeline, measured by the oxygen content measuring device 14, is higher than a second value.
Specifically, the second adjusting device 3 controls the current pressure in the pipeline to be 0.2-0.5 Mpa.
Specifically, the oxygen content of the gas entering the heating furnace 15 is 18% to 100%. Most preferably, the oxygen content of the gas entering the furnace 15 is 21% to 31%.
The invention provides a heating furnace oxygen-enriched combustion control system, which develops a set of new heating furnace oxygen-enriched combustion device, and a nitrogen making machine 1 of an air separation device produces residual oxygen to be introduced into a heating furnace 15, so that the heating furnace oxygen-enriched combustion process is realized, and the resource waste is avoided.
The heating furnace oxygen-enriched combustion control system provided by the invention can solve the problems of oxygen flow control, heating furnace oxygen blending proportion, heating furnace oxygen-enriched combustion risk control, heating furnace oxygen-enriched combustion logic relation and the like in the oxygen-enriched combustion process of the heating furnace 15.
The oxygen-enriched combustion control system of the heating furnace provided by the invention adopts the oxygen-enriched combustion technology of the heating furnace, improves the oxygen content in the air entering the heating furnace 15 from 21% to 21-100%, reduces the air volume entering the heating furnace 15, reduces the emission of flue gas and improves the heat efficiency of the heating furnace. Meanwhile, the risk problem in the oxygen-enriched combustion process of the heating furnace is avoided through a plurality of technical means, and the safe and stable operation of the heating furnace 15 is ensured.
The invention provides a heating furnace oxygen-enriched combustion control system, which comprises the following steps in actual operation:
1) the nitrogen making machine 1 of the air separation device uses raw air to produce nitrogen, the nitrogen is sent to a downstream device, and oxygen as a byproduct is sent out and enters the oxygen-enriched combustion control system of the heating furnace provided by the invention.
2) The oxygen is divided into two paths after leaving the nitrogen making machine, the two paths are respectively controlled by a regulating valve, namely a first regulating device 2 and a second regulating device 3, the oxygen pipeline is provided with pressure remote transmission, namely a pressure sensor 4, the pressure remote transmission is connected with a central controller, namely a control device 8, and the two regulating valves on the oxygen pipeline are also connected with the central controller.
3) Under normal working conditions, the first adjusting device 2 is closed, the second adjusting device 3 on the path of oxygen to the heating furnace 15 is opened, the second adjusting device 3 is used for controlling the oxygen pipeline pressure to be 0.2-0.5Mpa, the first adjusting device 2 is opened when the pipeline pressure is higher than the value, and the first adjusting device 2 is closed when the pipeline pressure is lower than the value. The oxygen line pressure is kept stable by the first regulator 2.
3) The oxygen then passes through a Y-filter, i.e. a first filter unit 5, having a mesh size of 30-200 mesh, which serves to filter solid impurities from the oxygen.
4) The oxygen is subjected to impurity removal by the filter and then is decompressed to 0-500 kpa.
5) Oxygen passes through the quick cut-off valve behind the relief valve, namely cutting device 7, and this cut-off valve has two states: the quick cut-off valve is fully opened and fully closed, and under the normal working condition, the quick cut-off valve is in a fully opened state.
6) Oxygen can be measured through the oxygen flowmeter valve bank, namely the metering device 9, after passing through the quick cut-off valve.
7) The oxygen then passes through a regulating valve block, i.e. a third regulating device 10, which can regulate the flow of oxygen.
8) The air enters the inlet of the blower after solid impurities in the air are filtered by the second filtering device 11.
9) The oxygen is mixed uniformly with atmospheric air at the blower inlet by a mixer 12.
10) The mixed oxygen-enriched air enters the heating furnace 15 through the blower, and the oxygen-enriched air is mixed with fuel in a fire pan of the heating furnace 15 and then is combusted.
Wherein, the central controller controls the quick cut-off valve, the flowmeter, the regulating valve group and the oxygen on-line analyzer.
Under normal conditions, the oxygen content of the air entering the heating furnace 15 is controlled between 18% and 100%, preferably between 21% and 31%.
The quick cut-off valve and the on-line oxygen analyzer are linked, and when the oxygen content of the on-line oxygen analyzer exceeds a certain numerical value, the quick cut-off valve triggers linkage to close. At the moment, the pressure in the oxygen pipeline rises and is transmitted to the central processing unit, the opening degree of the first adjusting device 2 is increased, and the pipeline pressure is released to prevent the pipeline from being suppressed.
Setting an on-line oxygen analysis instrument, controlling the oxygen flow by the action between the regulating valve group and the flowmeter when the oxygen content is stabilized at N%, and ensuring that the oxygen content in the air entering the heating furnace 15 is in a stable state.
For better understanding of the oxygen-enriched combustion control system of the heating furnace provided by the invention, the following description is provided:
1. fuel gas has an explosive limit relative to either oxygen or air, which is the concentration range within an enclosed space. When both reach the explosion range, explosion is possible. Therefore, the oxygen content of the air fed into the heating furnace 15 needs to be strictly controlled.
2. In the extreme case, if the fuel gas sprayed by a certain local burner is not sufficiently combusted, the local oxygen concentration may be increased, and if the concentration reaches the explosion limit, accidents may be caused.
3. If the pipeline contains grease, rust, etc., the oxygen is likely to generate static electricity during pipeline transportation, resulting in pipeline combustion.
The invention provides a heating furnace oxygen-enriched combustion control system, which comprises:
1. the oxygen needs to adopt pipelines, keys and instruments made of materials such as 304, 316 and the like in the process, and if the carbon steel pipelines are adopted, degreasing and passivation treatment are needed.
2. The valves of the oxygen flow meter valve group and the regulating valve group are preferably ball valves, and the valves should be oil-forbidden.
The invention provides a heating furnace oxygen-enriched combustion control system, which is implemented specifically as follows:
case 1, furnace oxycombustion control, the oxygen content into furnace 15 was controlled at 28% (volume fraction):
and the product of the air separation device enters an oxygen pipeline after pure oxygen passes through the second adjusting device 3, and the oxygen passes through the passageway to reach a Y-shaped filter in front of the heating furnace 15 to filter mechanical impurities in the oxygen. The oxygen pressure is reduced to 300-500Kpa by a pressure reducing valve. Oxygen passes through the quick cut-off valve, the flowmeter valves and the regulating valve group. The air is mixed with oxygen after impurities such as catkin and the like in the air are removed by an air filter, namely a second filter device 11. The mixed oxygen-enriched air enters the heating furnace 15 through a blower. The on-line analyzer determines the opening of the adjusting valve by analyzing the oxygen content in the oxygen-enriched air, and the oxygen in the oxygen-enriched air is kept constant.
Taking an 8MW industrial heating furnace as an example, the fuel gas composition (volume fraction): h2: 28.73%, air: 25.11%, CO: 3.585, CO2：2.462％，CH4: 25.86%, ethane: 14.01%, propane: 0.098%, propylene: 0.029%.
The smoke quantity is 3.73kg/s and the air quantity is 2.6Nm3/s, wherein the oxygen content is 0.55Nm3And s. The amount of air required for combustion after the introduction of partially pure oxygen was reduced (28% oxygen requirement), and the amount of air reduced was calculated to be 0.635Nm3The amount of oxygen to be supplemented is therefore: 485Nm3/h；
Due to the reduction of the air quantity by 0.635Nm3S, wherein N2In an amount of about 1756Nm3H; this moiety N2The temperature entering the air preheater was ambient (local annual average temperature 13 ℃) and the temperature of the exhaust air was about 165 ℃. Save this part N2The heat required to raise from ambient temperature to the exhaust gas temperature. Through calculation, the saved heat is 364.7MJ/h, which is converted into the gas quantity of 16 Kg/h. The gas consumption is saved by about 138 tons all the year round.
At this time, the oxygen flow rate can be controlled at 450-500Nm3And the oxygen content in the air is ensured to be about 28 percent between the first hour and the second hour.
Case 2, sudden increase in oxygen flow, triggering the interlock:
because some regulating devices such as the regulating valve on the pipeline are out of order, the regulating valve is fully opened, so that the oxygen entering the heating furnace 15 is too large, after the oxygen is analyzed by the oxygen online analyzer, the oxygen content entering the heating furnace 15 exceeds 35% (the oxygen content in the air is too large, so that local combustion is severe, and potential threat exists to production operation), at the moment, the linkage is triggered, the quick cut-off valve is closed, and the heating furnace 15 stops oxygen supply. Meanwhile, due to the fact that oxygen supply of the heating furnace 15 is cut off, the pressure in the oxygen pipeline rises, at the moment, the pressure in the oxygen pipeline is remotely sensed to enable the pressure in the pipeline to rise, at the moment, the first adjusting device 2 is started, and oxygen in the pipeline is released to the atmosphere. Ensuring the pressure of the oxygen pipeline to be within 0.3-0.5 Mpa.
the heating furnace 15 does not need to consume so much oxygen, but the air separation plant produces much oxygen. In order to ensure that the upstream and downstream devices are stable, the pressure in the oxygen pipeline rises at the moment, the pressure remote transmission sensing pressure rises quickly and slowly, and the opening size of the first adjusting device 2 is determined to maintain the pressure in the pipeline to be stable, so that the upstream and downstream devices are ensured to normally operate.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An oxygen-enriched combustion control system of a heating furnace is characterized by comprising an oxygen source, a second adjusting device, a first filtering device, a pressure reducing device, a cutting device, a metering device, a third adjusting device, a mixer and a power device which are sequentially communicated from the oxygen source until the oxygen source is communicated with the heating furnace,
a first adjusting device is arranged on a communicating pipeline between the second adjusting device and the oxygen source, one end of the first adjusting device is a discharge end,
a pressure sensor is arranged between the second adjusting device and the first filtering device,
an external air communication pipeline is arranged between the third adjusting device and the mixer, the gas flowing out of the third adjusting device and the gas flowing out of the external air communication pipeline enter the mixer to be mixed,
an oxygen content measuring device is arranged between the power device and the heating furnace;
the device also comprises a control device which is in signal connection with the first adjusting device, the second adjusting device, the pressure sensor, the cutting device, the metering device, the third adjusting device and the oxygen content measuring device,
the control device controls the opening and closing of the first adjusting device and the second adjusting device according to the signal of the pressure sensor,
the control device controls the opening and closing of the cutting device according to the signal of the oxygen content measuring device and adjusts the opening degree of the first adjusting device.
2. The oxycombustion control system for a heating furnace according to claim 1, wherein the oxygen source is an air separation plant nitrogen generator.
3. The oxycombustion control system for a heating furnace according to claim 1, wherein the control means is one, or,
the number of the control devices is two, one of the control devices controls the opening and closing of the first adjusting device and the second adjusting device according to the signal of the pressure sensor,
the other control device controls the opening and closing of the cutting device according to the signal of the oxygen content measuring device and adjusts the opening degree of the first adjusting device.
4. The oxycombustion control system for a heating furnace according to claim 1, wherein the first adjusting means and the second adjusting means are adjusting valves,
the third adjusting device is an adjusting valve group,
the metering device is a flow meter valve group,
the cutting device is a cut-off valve,
the power device is a blower, and the power device is a blower,
the oxygen content measuring device is an oxygen analyzer.
5. The oxycombustion control system for a heating furnace according to claim 1, wherein the first filter is a Y-type filter, and the number of filter meshes is 30-200.
6. A method for controlling the oxycombustion of a heating furnace, characterized in that based on the oxycombustion control system of a heating furnace according to any one of claims 1 to 5,
under the normal production working condition, the first adjusting device is closed, the second adjusting device is opened, and the cutting device is opened;
when the current pressure in the pipeline measured by the pressure sensor is higher than a first value, the control device controls the first adjusting device to be started;
when the current oxygen content in the pipeline measured by the oxygen content measuring device is higher than a second numerical value, the control device controls the cut-off device to be closed and controls the first adjusting device to be opened.
7. The oxycombustion control method for a heating furnace according to claim 6, wherein the control means further controls the opening degree of the first adjusting means when the current in-line pressure measured by the pressure sensor is higher than a first value,
and when the current oxygen content in the pipeline measured by the oxygen content measuring device is higher than a second numerical value, the control device also controls the opening degree of the first adjusting device.
8. The oxycombustion control method for a heating furnace according to claim 6, wherein the second adjusting means controls the current in-line pressure to be 0.2-0.5 Mpa.
9. The oxycombustion control method for a heating furnace according to claim 6, wherein the oxygen content of the gas introduced into the heating furnace is 18% to 100%.
10. The oxycombustion control method for a heating furnace according to claim 9, wherein the oxygen content of the gas introduced into the heating furnace is 21% to 31%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116026159A (en) * | 2022-12-26 | 2023-04-28 | 山东京博石油化工有限公司 | Oxygen-matching combustion process system of heating furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201944878U (en) * | 2011-01-07 | 2011-08-24 | 王坚 | Oxygen determination combustion energy-saving safe control device for heating furnace |
| CN205893296U (en) * | 2016-08-08 | 2017-01-18 | 四川德胜集团钒钛有限公司 | Blast furnace oxygen boosting valves |
| CN106755678A (en) * | 2016-12-14 | 2017-05-31 | 四川德胜集团钒钛有限公司 | Oxygen enrichment system before a kind of blast furnace machine |
| CN106755669A (en) * | 2016-12-14 | 2017-05-31 | 四川德胜集团钒钛有限公司 | Machine oxygen enriching process before a kind of blast furnace |
| CN107955848A (en) * | 2017-12-27 | 2018-04-24 | 北京京诚科林环保科技有限公司 | Oxygen-enriching device before a kind of blast furnace machine |
| JP2018172720A (en) * | 2017-03-31 | 2018-11-08 | Ｊｆｅスチール株式会社 | Blowing method to furnace and blower |
-
2021
- 2021-01-15 CN CN202110054690.9A patent/CN112797440A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201944878U (en) * | 2011-01-07 | 2011-08-24 | 王坚 | Oxygen determination combustion energy-saving safe control device for heating furnace |
| CN205893296U (en) * | 2016-08-08 | 2017-01-18 | 四川德胜集团钒钛有限公司 | Blast furnace oxygen boosting valves |
| CN106755678A (en) * | 2016-12-14 | 2017-05-31 | 四川德胜集团钒钛有限公司 | Oxygen enrichment system before a kind of blast furnace machine |
| CN106755669A (en) * | 2016-12-14 | 2017-05-31 | 四川德胜集团钒钛有限公司 | Machine oxygen enriching process before a kind of blast furnace |
| JP2018172720A (en) * | 2017-03-31 | 2018-11-08 | Ｊｆｅスチール株式会社 | Blowing method to furnace and blower |
| CN107955848A (en) * | 2017-12-27 | 2018-04-24 | 北京京诚科林环保科技有限公司 | Oxygen-enriching device before a kind of blast furnace machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116026159A (en) * | 2022-12-26 | 2023-04-28 | 山东京博石油化工有限公司 | Oxygen-matching combustion process system of heating furnace |
| CN116026159B (en) * | 2022-12-26 | 2024-05-31 | 山东京博石油化工有限公司 | Oxygen-matching combustion process system of heating furnace |
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