CN114060806A - Low-nitrogen combustion transformation method and system for light-burning kiln - Google Patents
Low-nitrogen combustion transformation method and system for light-burning kiln Download PDFInfo
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- CN114060806A CN114060806A CN202111201200.XA CN202111201200A CN114060806A CN 114060806 A CN114060806 A CN 114060806A CN 202111201200 A CN202111201200 A CN 202111201200A CN 114060806 A CN114060806 A CN 114060806A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 59
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 35
- 238000011426 transformation method Methods 0.000 title claims abstract description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 124
- 239000003345 natural gas Substances 0.000 claims abstract description 63
- 239000003546 flue gas Substances 0.000 claims abstract description 50
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000007789 gas Substances 0.000 claims abstract description 35
- 230000000087 stabilizing effect Effects 0.000 claims description 51
- 239000003245 coal Substances 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000002715 modification method Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 238000002407 reforming Methods 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 37
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/60—Devices for simultaneous control of gas and combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/68—Treating the combustion air or gas, e.g. by filtering, or moistening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
A low-nitrogen combustion transformation method and system of a light-burning kiln belong to the technical field of low-nitrogen combustion, and the transformation method comprises the installation of a natural gas pipeline, an air main pipe and a flue gas circulating pipeline; the system comprises a light-burning kiln, burners, a natural gas pipeline, an air main pipe, a flue gas circulating pipeline, an air pipeline, a steam pipeline, a blower, an induced draft fan, a mixer, a purifier and the like; the invention specially aims at the transformation of 'coal-to-gas' of the light-burning kiln, realizes low-nitrogen combustion, reduces the discharge amount of NOx, ensures the stable operation of the light-burning kiln, reduces potential safety hazards, prolongs the service life and achieves the effect of clean production. The emission of nitrogen oxides can be greatly reduced by more than 30% compared with the emission of the common coal-to-gas technology, and the service life of the pipeline can be prolonged by more than 1 year.
Description
Technical Field
The invention belongs to the technical field of low-nitrogen combustion, and particularly relates to a low-nitrogen combustion modification method and system for a light-burning kiln.
Background
At present, the magnesite calcining process adopts a traditional light-burning kiln to provide combustible gas to be fed into the kiln for combustion, the heat value of gas in the light-burning kiln is 1250-1300 kca/m lower, about 3m of gas can be generated per kilogram of coal (5000kcal/kg), the process of converting the coal into the gas has the disadvantages of great heat waste, great secondary transportation, storage and operation cost, and the process is gradually eliminated along with strict control of environmental quality standards. Along with the increasing demand of people for good life, the environmental requirements are higher and higher, the emission standard is also higher and tighter in the kiln industry, natural gas belongs to clean fuel, pollutants generated by combustion are less, and the emission of dust and sulfur dioxide is nearly zero, so the industry gradually advances 'coal-to-gas'. Dust and sulfur dioxide in the pollutants discharged by the kiln after coal gasification are reduced, the discharge proportion of nitrogen oxides (NOx) is increased, and the relative contribution of the NOx to PM2.5 is increased year by year, and the relative contribution of the NOx to the PM2.5 becomes the key for controlling the PM 2.5. With the gradual advance of changing coal into gas, the combustion of a natural gas boiler becomes an important source of NOx pollution, so that the implementation of kiln transformation and the control of the NOx emission of a kiln have important significance.
Disclosure of Invention
Aiming at the problems of high cost, serious pollution and the like of the light-burning kiln in the prior art, the invention provides the low-nitrogen combustion transformation method and the low-nitrogen combustion transformation system for the light-burning kiln, which are specially used for transforming coal into gas for the light-burning kiln, realize low-nitrogen combustion, reduce the discharge amount of NOx and achieve the effect of clean production. The specific technical scheme is as follows:
a low-nitrogen combustion transformation method for a light-burning kiln comprises the following steps:
step 1:
dismantling the original coal burning device;
step 2:
reforming a pipeline, mounting a natural gas burner at an air inlet pipe of the light-burning kiln, and branching three pipelines, wherein the first pipeline is communicated with natural gas, the second pipeline is communicated with air, and the third pipeline is circularly communicated with flue gas of the light-burning kiln;
and step 3:
a filter, a pressure reducing and stabilizing valve and a pressure stabilizing and releasing pipeline are arranged on the first pipeline, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 4, step 4:
the second pipeline is an air main pipe, a blower is arranged at the port of the second pipeline, air is blown in, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 5:
the third pipeline is a flue gas circulation pipeline, the port of the third pipeline is connected with the exhaust port of the light-burning kiln, and a purifier, a mixer and an induced draft fan are arranged on the third pipeline; introducing an air pipeline and a steam pipeline on the third pipeline; then setting corresponding control valves and monitoring meters.
A low-nitrogen combustion system of a light-burning kiln, in particular to a system modified by the low-nitrogen combustion modification method of the light-burning kiln, as shown in fig. 1, comprising: the device comprises a light-burning kiln 16, a burner 15, a natural gas pipeline 1, an air main 44, a flue gas circulating pipeline 45, an air pipeline 36, a steam pipeline 40, a blower 17, an induced draft fan 26, a mixer 27 and a purifier 32; the light-burning kiln 16 is provided with a gas inlet and a light-burning kiln exhaust port 35;
a burner 15 is arranged at a gas inlet of the light-burning kiln 16; the head end of the natural gas pipeline 1 is connected with natural gas, and the tail end of the natural gas pipeline is connected with a burner 15; the head end of the air main pipe 44 is connected with the blower 17, and the tail end is connected with the burner 15; the head end of the flue gas circulating pipeline 45 is connected with the exhaust port 35 of the light-burning kiln, and the tail end of the flue gas circulating pipeline is connected with the burner inlet end of the air main pipe 44; the flue gas circulating pipeline 45 is sequentially provided with a purifier 32, a steam pipeline 40, an air pipeline 36, a mixer 27 and an induced draft fan 26 from the head end to the tail end;
in the technical scheme, the natural gas pipeline 1 is sequentially provided with a filter 2, a high-pressure gauge I3, a safety cut-off valve 4, a pressure reducing and stabilizing valve I5, a pressure switch I6, a pressure switch II 7, a high-pressure gauge II 8, a pressure stabilizing release pipeline 11, an electromagnetic valve I12 and an electromagnetic valve II 13 from the head end;
in the technical scheme, a manual valve I9 and a pressure stabilizing release valve I10 are arranged on the pressure stabilizing release pipeline 11;
in the technical scheme, the air main pipe 44 is sequentially provided with a blower 17, a manual valve II 18, a pressure switch III 19, a pressure gauge I20, an electromagnetic valve III 21 and a fine adjustment valve 22 from the head end;
in the technical scheme, the electromagnetic valve I12, the electromagnetic valve II 13 and the electromagnetic valve III 21 are connected in parallel with the controller 14 and controlled by the controller 14;
in the technical scheme, the flue gas circulation pipeline 45 is sequentially provided with a manual valve III 34, a purifier 32, a pressure gauge V31, a pressure stabilizing release valve II 30, a steam pipeline 40, a pressure gauge IV 29, an air pipeline 36, a pressure gauge III 28, a mixer 27, an induced draft fan 26, a pressure reducing and stabilizing valve II 25, a pressure gauge II 24 and a pressure switch IV 23 from the head end;
in the above technical solution, the purifier 32 is provided with a drain valve 33;
in the above technical solution, the air pipe 36 is provided with an air pipe valve 37, an air pipe pressure gauge 38 and an air pipe pressure switch 39;
in the above technical solution, the steam pipeline 40 is provided with a steam pipeline valve 41, a steam pipeline pressure gauge 42 and a steam pipeline pressure switch 43.
The use method of the low-nitrogen combustion system of the light-burning kiln comprises the following steps:
step 1: introducing primary natural gas into a natural gas pipeline 1, closing a safety cut-off valve 4, a manual valve I9 and a pressure stabilizing release valve I10, opening a pressure switch I6, a pressure switch II 7, a solenoid valve I12 and a solenoid valve II 13, and adjusting a pressure reducing and stabilizing valve I5 according to the air pressure conditions monitored by a high-pressure gauge I3 and a high-pressure gauge II 8; leading primary natural gas into the burner 15 stably;
step 2: starting the air blower 17, a manual valve II 18, a pressure switch III 19, an electromagnetic valve III 21 and a fine adjustment valve 22, adjusting the manual valve II 18 and the pressure switch III 19 according to a pressure gauge I20, and stably blowing air into the burner 15;
and step 3: starting the light-burning kiln 16 and the burner 15 to mix, burn and heat the primary natural gas and the air in the light-burning kiln 16;
and 4, step 4: starting a manual valve III 34 to enable the combusted flue gas to enter a purifier 32, then entering a mixer 27 after being purified by the purifier 32, introducing steam and air into the mixer 27 through an air pipeline 36 and a steam pipeline 40, mixing the steam and the air by the mixer 27 to form mixed gas, starting an induced draft fan 26, introducing the mixed gas into a burner 15, and performing flue gas recycling combustion;
and 5: when the combustion is recycled, the control controller 14 adjusts the electromagnetic valve I12, the electromagnetic valve II 13 and the electromagnetic valve III 21, and intermittently replenishes primary natural gas and air to the burner 15;
step 6: opening the exhaust valve 33 to exhaust the filtered clean gas after the circular combustion;
and 7: after the light-burning kiln 16 is shut down and closed, the pressure stabilizing release pipeline 11 and the pressure stabilizing release valve II 30 are opened for emptying;
and 8: when an emergency occurs, the safety cut-off valve 4 is opened to cut off the supply of the natural gas for one time in time.
Compared with the prior art, the low-nitrogen combustion transformation method and the system thereof for the light-burning kiln have the beneficial effects that:
the method and the system of the invention utilize the flue gas circulation to mix the partially combusted flue gas with the oxidant and then participate in the combustion again, thereby reducing the oxygen content in the original air and enabling the natural gas to be in an anoxic combustion state, thereby controlling the combustion temperature and further reducing the generation concentration of NOx.
Secondly, because the flue gas recirculation effect is influenced by factors such as the recirculated flue gas amount, the mixed gas temperature, the flue gas taking point, the flue gas components and the like, the invention is designed to charge proper amount of steam and air, and a mixer is designed to mix and is conveyed by a draught fan, so that the flow stability of the flue gas is ensured, and in addition, the combustion stability of the kiln is ensured by regulating the flow of primary natural gas and air by a controller, and the flameout phenomenon cannot be generated.
The temperature of the smoke discharged from the smoke is not high, and the temperature of the smoke is lower than the dew point temperature after the recirculated smoke and the cold air are mixed, so that the problem of dew point corrosion is easily caused; meanwhile, the proper amount of steam can properly inhibit combustion, control the combustion temperature and further reduce the generation concentration of NOx.
And fourthly, the invention combines the design of a purifier at the tail part of the kiln, properly purifies the flue gas, further reduces the concentration of nitrogen oxides and reaches the emission standard.
The air main pipe can supplement oxygen for the flue gas in a proper amount, prevent the flameout phenomenon of the kiln due to improper flue gas content or flow control and dually ensure the stable operation of the kiln.
And sixthly, the fine adjustment valve is designed at the inlet of the burner, so that the flow of the flue gas is further accurately controlled, and the phenomenon of unstable release of the flue gas and flameout or combustion transition is prevented.
And seventhly, a plurality of valves are designed on each pipeline, such as a manual valve, a safety cut-off valve, a pressure reducing and stabilizing valve, a pressure switch, an electromagnetic valve and the like, so that the pressure flow of each gas can be stabilized, the stable operation is ensured, and the danger is prevented.
Eighthly, the natural gas pipeline is matched with the primary natural gas filling, so that the natural gas can be supplemented in a proper amount, and the phenomenon of flameout caused by excessive smoke is prevented; according to the flow and the state of the flue gas, the flow ratio of the natural gas to the air is controlled by the controller, so that the stable operation of the kiln is ensured.
The method and the system for improving the nitrogen oxide emission can greatly reduce the emission of the nitrogen oxide, and compared with the common coal gas improvement technology, the emission can be reduced by more than 30%, and meanwhile, the service life of a pipeline can be prolonged by more than 1 year.
Drawings
FIG. 1 is a schematic diagram of a system modified by a low-nitrogen combustion modification method for a light-burning kiln according to the present invention;
in the figure, 1-natural gas pipeline, 2-filter, 3-high pressure gauge I, 4-safety cut-off valve, 5-pressure reducing and pressure stabilizing valve I, 6-pressure switch I, 7-pressure switch II, 8-high pressure gauge II, 9-manual valve I, 10-pressure stabilizing and releasing valve I, 11-pressure stabilizing and releasing pipeline, 12-electromagnetic valve I, 13-electromagnetic valve II, 14-controller, 15-burner, 16-light burning kiln, 17-blower, 18-manual valve II, 19-pressure switch III, 20-pressure gauge I, 21-electromagnetic valve III, 22-fine adjustment valve, 23-pressure switch IV, 24-pressure gauge II, 25-pressure reducing and pressure stabilizing valve II, 26-induced draft fan, 27-mixer and 28-pressure gauge III, 29-pressure gauge IV, 30-pressure-stabilizing release valve II, 31-pressure gauge V, 32-purifier, 33-discharge valve, 34-manual valve III, 35-light burning kiln exhaust port, 36-air pipeline, 37-air pipeline valve, 38-air pipeline pressure gauge, 39-air pipeline pressure switch, 40-steam pipeline, 41-steam pipeline valve, 42-steam pipeline pressure gauge, 43-steam pipeline pressure switch, 44-air main pipe and 45-flue gas circulation pipeline.
Detailed Description
The invention will be further described with reference to the following description and the accompanying drawing 1, but the invention is not limited to these examples.
Example 1
In this embodiment, "coal changes gas" to reform transform a light-burning kiln burning coal, demolish the original coal-burning device, and install the gas-burning device, the concrete transformation method is as follows:
a low-nitrogen combustion transformation method for a light-burning kiln comprises the following steps:
step 1:
dismantling the original coal burning device;
step 2:
reforming a pipeline, mounting a natural gas burner at an air inlet pipe of the light-burning kiln, and branching three pipelines, wherein the first pipeline is communicated with natural gas, the second pipeline is communicated with air, and the third pipeline is circularly communicated with flue gas of the light-burning kiln;
and step 3:
a filter, a pressure reducing and stabilizing valve and a pressure stabilizing and releasing pipeline are arranged on the first pipeline, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 4, step 4:
the second pipeline is an air main pipe, a blower is arranged at the port of the second pipeline, air is blown in, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 5:
the third pipeline is a flue gas circulation pipeline, the port of the third pipeline is connected with the exhaust port of the light-burning kiln, and a purifier, a mixer and an induced draft fan are arranged on the third pipeline; introducing an air pipeline and a steam pipeline on the third pipeline; then setting corresponding control valves and monitoring meters.
A low-nitrogen combustion system of a light-burning kiln, in particular to a system modified by the low-nitrogen combustion modification method of the light-burning kiln, as shown in fig. 1, comprising: the device comprises a light-burning kiln 16, a burner 15, a natural gas pipeline 1, an air main 44, a flue gas circulating pipeline 45, an air pipeline 36, a steam pipeline 40, a blower 17, an induced draft fan 26, a mixer 27 and a purifier 32; the light-burning kiln 16 is provided with a gas inlet and a light-burning kiln exhaust port 35;
a burner 15 is arranged at a gas inlet of the light-burning kiln 16; the head end of the natural gas pipeline 1 is connected with natural gas, and the tail end of the natural gas pipeline is connected with a burner 15; the head end of the air main pipe 44 is connected with the blower 17, and the tail end is connected with the burner 15; the head end of the flue gas circulating pipeline 45 is connected with the exhaust port 35 of the light-burning kiln, and the tail end of the flue gas circulating pipeline is connected with the burner inlet end of the air main pipe 44; the flue gas circulating pipeline 45 is sequentially provided with a purifier 32, a steam pipeline 40, an air pipeline 36, a mixer 27 and an induced draft fan 26 from the head end to the tail end;
the natural gas pipeline 1 is sequentially provided with a filter 2, a high-pressure gauge I3, a safety cut-off valve 4, a pressure reducing and stabilizing valve I5, a pressure switch I6, a pressure switch II 7, a high-pressure gauge II 8, a pressure stabilizing release pipeline 11, an electromagnetic valve I12 and an electromagnetic valve II 13 from the head end;
a manual valve I9 and a pressure stabilizing release valve I10 are arranged on the pressure stabilizing release pipeline 11;
the air main pipe 44 is sequentially provided with a blower 17, a manual valve II 18, a pressure switch III 19, a pressure gauge I20, an electromagnetic valve III 21 and a fine adjustment valve 22 from the head end;
the electromagnetic valve I12, the electromagnetic valve II 13 and the electromagnetic valve III 21 are connected in parallel with a controller 14 and are controlled by the controller 14;
the smoke circulating pipeline 45 is sequentially provided with a manual valve III 34, a purifier 32, a pressure gauge V31, a pressure stabilizing release valve II 30, a steam pipeline 40, a pressure gauge IV 29, an air pipeline 36, a pressure gauge III 28, a mixer 27, an induced draft fan 26, a pressure reducing and stabilizing valve II 25, a pressure gauge II 24 and a pressure switch IV 23 from the head end;
the purifier 32 is provided with a drain valve 33;
the air pipeline 36 is provided with an air pipeline valve 37, an air pipeline pressure gauge 38 and an air pipeline pressure switch 39;
the steam pipeline 40 is provided with a steam pipeline valve 41, a steam pipeline pressure gauge 42 and a steam pipeline pressure switch 43.
The use method of the low-nitrogen combustion system of the light-burning kiln comprises the following steps:
step 1: introducing primary natural gas into a natural gas pipeline 1, closing a safety cut-off valve 4, a manual valve I9 and a pressure stabilizing release valve I10, opening a pressure switch I6, a pressure switch II 7, a solenoid valve I12 and a solenoid valve II 13, and adjusting a pressure reducing and stabilizing valve I5 according to the air pressure conditions monitored by a high-pressure gauge I3 and a high-pressure gauge II 8; leading primary natural gas into the burner 15 stably;
step 2: starting the air blower 17, a manual valve II 18, a pressure switch III 19, an electromagnetic valve III 21 and a fine adjustment valve 22, adjusting the manual valve II 18 and the pressure switch III 19 according to a pressure gauge I20, and stably blowing air into the burner 15;
and step 3: starting the light-burning kiln 16 and the burner 15 to mix, burn and heat the primary natural gas and the air in the light-burning kiln 16;
and 4, step 4: starting a manual valve III 34 to enable the combusted flue gas to enter a purifier 32, then entering a mixer 27 after being purified by the purifier 32, introducing steam and air into the mixer 27 through an air pipeline 36 and a steam pipeline 40, mixing the steam and the air by the mixer 27 to form mixed gas, starting an induced draft fan 26, introducing the mixed gas into a burner 15, and performing recycling combustion;
and 5: when the combustion is recycled, the control controller 14 adjusts the electromagnetic valve I12, the electromagnetic valve II 13 and the electromagnetic valve III 21, and intermittently replenishes primary natural gas and air to the burner 15;
step 6: opening the exhaust valve 33 to exhaust the filtered clean gas after the circular combustion;
and 7: after the light-burning kiln 16 is shut down and closed, the pressure stabilizing release pipeline 11 and the pressure stabilizing release valve II 30 are opened for emptying;
and 8: when an emergency occurs, the safety cut-off valve 4 is opened to cut off the supply of the natural gas for one time in time.
After the experiment is carried out for two months, the effect is good, the phenomena of flameout or overhigh temperature are avoided, and safety accidents are avoided; the stable circulating combustion of the flue gas is controlled, and compared with the common coal-to-gas technology, the emission of nitrogen oxides can be reduced by more than 30%.
Example 2
In this embodiment, "coal changes gas" to reform transform a light-burning kiln burning coal, demolish the original coal-burning device, and install the gas-burning device, the concrete transformation method is as follows:
a low-nitrogen combustion transformation method for a light-burning kiln comprises the following steps:
step 1:
dismantling the original coal burning device;
step 2:
reforming a pipeline, mounting a natural gas burner at an air inlet pipe of the light-burning kiln, and branching three pipelines, wherein the first pipeline is communicated with natural gas, the second pipeline is communicated with air, and the third pipeline is circularly communicated with flue gas of the light-burning kiln;
and step 3:
a filter, a pressure reducing and stabilizing valve and a pressure stabilizing and releasing pipeline are arranged on the first pipeline, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 4, step 4:
the second pipeline is an air main pipe, a blower is arranged at the port of the second pipeline, air is blown in, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 5:
the third pipeline is a flue gas circulation pipeline, the port of the third pipeline is connected with the exhaust port of the light-burning kiln, and a purifier, a mixer and an induced draft fan are arranged on the third pipeline; introducing an air pipeline and a steam pipeline on the third pipeline; then setting corresponding control valves and monitoring meters.
A low-nitrogen combustion system of a light-burning kiln, in particular to a system modified by the low-nitrogen combustion modification method of the light-burning kiln, as shown in fig. 1, comprising: the device comprises a light-burning kiln 16, a burner 15, a natural gas pipeline 1, an air main 44, a flue gas circulating pipeline 45, an air pipeline 36, a steam pipeline 40, a blower 17, an induced draft fan 26, a mixer 27 and a purifier 32; the light-burning kiln 16 is provided with a gas inlet and a light-burning kiln exhaust port 35;
a burner 15 is arranged at a gas inlet of the light-burning kiln 16; the head end of the natural gas pipeline 1 is connected with natural gas, and the tail end of the natural gas pipeline is connected with a burner 15; the head end of the air main pipe 44 is connected with the blower 17, and the tail end is connected with the burner 15; the head end of the flue gas circulating pipeline 45 is connected with the exhaust port 35 of the light-burning kiln, and the tail end of the flue gas circulating pipeline is connected with the burner inlet end of the air main pipe 44; the flue gas circulating pipeline 45 is sequentially provided with a purifier 32, a steam pipeline 40, an air pipeline 36, a mixer 27 and an induced draft fan 26 from the head end to the tail end;
the natural gas pipeline 1 is sequentially provided with a filter 2, a high-pressure gauge I3, a safety cut-off valve 4, a pressure reducing and stabilizing valve I5, a pressure switch I6, a pressure switch II 7, a high-pressure gauge II 8, a pressure stabilizing release pipeline 11, an electromagnetic valve I12 and an electromagnetic valve II 13 from the head end;
a manual valve I9 and a pressure stabilizing release valve I10 are arranged on the pressure stabilizing release pipeline 11;
the air main pipe 44 is sequentially provided with a blower 17, a manual valve II 18, a pressure switch III 19, a pressure gauge I20, an electromagnetic valve III 21 and a fine adjustment valve 22 from the head end;
the electromagnetic valve I12, the electromagnetic valve II 13 and the electromagnetic valve III 21 are connected in parallel with a controller 14 and are controlled by the controller 14;
the smoke circulating pipeline 45 is sequentially provided with a manual valve III 34, a purifier 32, a pressure gauge V31, a pressure stabilizing release valve II 30, a steam pipeline 40, a pressure gauge IV 29, an air pipeline 36, a pressure gauge III 28, a mixer 27, an induced draft fan 26, a pressure reducing and stabilizing valve II 25, a pressure gauge II 24 and a pressure switch IV 23 from the head end;
the purifier 32 is provided with a drain valve 33;
the air pipeline 36 is provided with an air pipeline valve 37, an air pipeline pressure gauge 38 and an air pipeline pressure switch 39;
the steam pipeline 40 is provided with a steam pipeline valve 41, a steam pipeline pressure gauge 42 and a steam pipeline pressure switch 43.
The use method of the low-nitrogen combustion system of the light-burning kiln comprises the following steps:
step 1: introducing primary natural gas into a natural gas pipeline 1, closing a safety cut-off valve 4, a manual valve I9 and a pressure stabilizing release valve I10, opening a pressure switch I6, a pressure switch II 7, a solenoid valve I12 and a solenoid valve II 13, and adjusting a pressure reducing and stabilizing valve I5 according to the air pressure conditions monitored by a high-pressure gauge I3 and a high-pressure gauge II 8; leading primary natural gas into the burner 15 stably;
step 2: starting the air blower 17, a manual valve II 18, a pressure switch III 19, an electromagnetic valve III 21 and a fine adjustment valve 22, adjusting the manual valve II 18 and the pressure switch III 19 according to a pressure gauge I20, and stably blowing air into the burner 15;
and step 3: starting the light-burning kiln 16 and the burner 15 to mix, burn and heat the primary natural gas and the air in the light-burning kiln 16;
and 4, step 4: starting a manual valve III 34 to enable the combusted flue gas to enter a purifier 32, then entering a mixer 27 after being purified by the purifier 32, introducing steam and air into the mixer 27 through an air pipeline 36 and a steam pipeline 40, mixing the steam and the air by the mixer 27 to form mixed gas, starting an induced draft fan 26, introducing the mixed gas into a burner 15, and performing recycling combustion;
and 5: when the combustion is recycled, the control controller 14 adjusts the electromagnetic valve I12, the electromagnetic valve II 13 and the electromagnetic valve III 21, and intermittently replenishes primary natural gas and air to the burner 15;
step 6: opening the exhaust valve 33 to exhaust the filtered clean gas after the circular combustion;
and 7: after the light-burning kiln 16 is shut down and closed, the pressure stabilizing release pipeline 11 and the pressure stabilizing release valve II 30 are opened for emptying;
and 8: when an emergency occurs, the safety cut-off valve 4 is opened to cut off the supply of the natural gas for one time in time.
After trial for 20 months, the effect is good, and no flameout or over-high temperature phenomenon or safety accident occurs; the stable circulating combustion of the flue gas is controlled, compared with the common coal-to-gas technology, the emission of nitrogen oxides can be reduced by more than 32%, the pipeline runs well, the phenomenon of serious corrosion does not occur, the energy is saved, the environment is protected, and the high approval of customers is obtained.
Claims (10)
1. A low-nitrogen combustion transformation method of a light-burning kiln is characterized by comprising the following steps:
step 1:
dismantling the original coal burning device;
step 2:
reforming a pipeline, mounting a natural gas burner at an air inlet pipe of the light-burning kiln, and branching three pipelines, wherein the first pipeline is communicated with natural gas, the second pipeline is communicated with air, and the third pipeline is circularly communicated with flue gas of the light-burning kiln;
and step 3:
a filter, a pressure reducing and stabilizing valve and a pressure stabilizing and releasing pipeline are arranged on the first pipeline, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 4, step 4:
the second pipeline is an air main pipe, a blower is arranged at the port of the second pipeline, air is blown in, and a corresponding control valve and a monitoring instrument are arranged on the pipeline;
and 5:
the third pipeline is a flue gas circulation pipeline, the port of the third pipeline is connected with the exhaust port of the light-burning kiln, and a purifier, a mixer and an induced draft fan are arranged on the third pipeline; introducing an air pipeline and a steam pipeline on the third pipeline; then setting corresponding control valves and monitoring meters.
2. A low-nitrogen combustion system of a light-burning kiln, in particular to a system modified by the low-nitrogen combustion modification method of the light-burning kiln, which is characterized by comprising the following steps: the device comprises a light-burning kiln (16), burners (15), a natural gas pipeline (1), an air main pipe (44), a flue gas circulating pipeline (45), an air pipeline (36), a steam pipeline (40), a blower (17), an induced draft fan (26), a mixer (27) and a purifier (32); the light-burning kiln (16) is provided with a gas inlet and a light-burning kiln exhaust port (35);
a burner (15) is arranged at a gas inlet of the light-burning kiln (16); the head end of the natural gas pipeline (1) is connected with natural gas, and the tail end of the natural gas pipeline is connected with a burner (15); the head end of the air main pipe (44) is connected with the blower (17), and the tail end of the air main pipe is connected with the burner (15); the head end of the flue gas circulating pipeline (45) is connected with an exhaust port (35) of the light-burning kiln, and the tail end of the flue gas circulating pipeline is connected with the inlet end of a burner of an air main pipe (44); the flue gas circulating pipeline (45) is sequentially provided with a purifier (32), a steam pipeline (40), an air pipeline (36), a mixer (27) and an induced draft fan (26) from the head end to the tail end.
3. The low-nitrogen combustion system of the light-burning kiln as claimed in claim 2, wherein the natural gas pipeline (1) is provided with a filter (2), a high-pressure gauge I (3), a safety shut-off valve (4), a pressure reducing and stabilizing valve I (5), a pressure switch I (6), a pressure switch II (7), a high-pressure gauge II (8), a pressure stabilizing release pipeline (11), an electromagnetic valve I (12) and an electromagnetic valve II (13) in sequence from the head end.
4. The low-nitrogen combustion system of the light-burning kiln as recited in claim 3, wherein the pressure-stabilizing release pipe (11) is provided with a manual valve I (9) and a pressure-stabilizing release valve I (10).
5. The low-nitrogen combustion system of the light-burning kiln as recited in claim 2, wherein the air main (44) is provided with a blower (17), a manual valve II (18), a pressure switch III (19), a pressure gauge I (20), an electromagnetic valve III (21) and a fine adjustment valve (22) in sequence from the head end.
6. The low-nitrogen combustion system of the light-burning kiln as claimed in claim 3 or 5, wherein the solenoid valve I (12), the solenoid valve II (13) and the solenoid valve III (21) are connected in parallel with a controller (14) and controlled by the controller (14).
7. The low-nitrogen combustion system of the light burning kiln as recited in claim 2, wherein the flue gas circulation pipeline (45) is provided with a manual valve III (34), a purifier (32), a pressure gauge V (31), a pressure stabilizing release valve II (30), a steam pipeline (40), a pressure gauge IV (29), an air pipeline (36), a pressure gauge III (28), a mixer (27), an induced draft fan (26), a pressure reducing and stabilizing valve II (25), a pressure gauge II (24) and a pressure switch IV (23) in sequence from the head end; the purifier (32) is provided with a drain valve (33).
8. The low-nitrogen combustion system of the light-burning kiln as recited in claim 7, wherein an air duct valve (37), an air duct pressure gauge (38) and an air duct pressure switch (39) are provided on the air duct (36).
9. The low-nitrogen combustion system of the light-burning kiln as recited in claim 7, wherein the steam pipeline (40) is provided with a steam pipeline valve (41), a steam pipeline pressure gauge (42) and a steam pipeline pressure switch (43).
10. The use method of the low-nitrogen combustion system of the light-burning kiln, which is characterized by comprising the following steps:
step 1: introducing primary natural gas into a natural gas pipeline (1), closing a safety cut-off valve (4), a manual valve I (9) and a pressure stabilizing release valve I (10), opening a pressure switch I (6), a pressure switch II (7), a solenoid valve I (12) and a solenoid valve II (13), and adjusting a pressure reducing and stabilizing valve I (5) according to the air pressure conditions monitored by a high-pressure gauge I (3) and a high-pressure gauge II (8); leading primary natural gas into a burner (15) stably;
step 2: starting a blower (17), a manual valve II (18), a pressure switch III (19), an electromagnetic valve III (21) and a fine adjustment valve (22), adjusting the manual valve II (18) and the pressure switch III (19) according to a pressure gauge I (20), and stably blowing air into the burner (15);
and step 3: opening the light-burning kiln (16) and the burner (15) to mix, burn and heat the primary natural gas and the air in the light-burning kiln (16);
and 4, step 4: starting a manual valve III (34) to enable the combusted flue gas to enter a purifier (32), then entering a mixer (27) after being purified by the purifier (32), introducing steam and air into the mixer (27) through an air pipeline (36) and a steam pipeline (40), mixing the steam and the air by the mixer (27) to form mixed gas, starting a draught fan (26), introducing the mixed gas into a burner (15), and performing flue gas recycling and combustion;
and 5: when the combustion is recycled, the control controller (14) adjusts the electromagnetic valve I (12), the electromagnetic valve II (13) and the electromagnetic valve III (21), and the burner (15) is intermittently supplemented with primary natural gas and air;
step 6: opening an exhaust valve (33) to exhaust the filtered clean gas after the circular combustion;
and 7: after the light-burning kiln (16) is shut down and closed, a pressure stabilizing release pipeline (11) and a pressure stabilizing release valve II (30) are opened for emptying;
and 8: when an emergency occurs, the safety shut-off valve (4) is opened to cut off the supply of natural gas once in time.
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