CN109579008A - The warm and humid coupling gas fired-boiler low nitrogen burning system of one kind and operation method - Google Patents
The warm and humid coupling gas fired-boiler low nitrogen burning system of one kind and operation method Download PDFInfo
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- CN109579008A CN109579008A CN201910012938.8A CN201910012938A CN109579008A CN 109579008 A CN109579008 A CN 109579008A CN 201910012938 A CN201910012938 A CN 201910012938A CN 109579008 A CN109579008 A CN 109579008A
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- collection device
- pipe
- water
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000007789 gas Substances 0.000 title claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 28
- 230000008878 coupling Effects 0.000 title claims abstract description 23
- 238000010168 coupling process Methods 0.000 title claims abstract description 23
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 239000003546 flue gas Substances 0.000 claims abstract description 67
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 63
- 230000009466 transformation Effects 0.000 claims abstract description 45
- 239000007921 spray Substances 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 230000036961 partial effect Effects 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 6
- 239000000779 smoke Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 42
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 22
- 235000019504 cigarettes Nutrition 0.000 claims description 10
- 239000003345 natural gas Substances 0.000 claims description 10
- 238000009833 condensation Methods 0.000 claims description 9
- 230000005494 condensation Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000003134 recirculating effect Effects 0.000 claims description 3
- 210000000038 chest Anatomy 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000000567 combustion gas Substances 0.000 abstract 1
- 230000008676 import Effects 0.000 abstract 1
- 230000009467 reduction Effects 0.000 abstract 1
- 230000002829 reductive effect Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000003643 water by type Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- 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
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
- F28C3/08—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour with change of state, e.g. absorption, evaporation, condensation
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
The invention discloses a kind of warm and humid coupling gas fired-boiler low nitrogen burning system and operation methods, including burner and burner hearth, phase transformation cohesion water collection device, mixer, temperature and humidity regulator etc..Phase transformation, which is agglomerated, is equipped with heat exchanger tube, spraying cooling pipe row and labyrinth type water collection device in water collection device.Uniform flow orifice, spray humidification pipe row and heat exchanger tube are equipped with inside temperature and humidity regulator.Burner and burner hearth, convection heating surface and phase transformation cohesion water collection device are sequentially connected.Import is connect by recirculation blower with phase transformation cohesion water collection device mixer all the way, and mixed air is sent into burner, participates in burning in furnace.The condensed water of phase transformation cohesion water collection device is collected by high-level water storage case, is all sprayed into temperature and humidity regulator, for heating and humidifying air.The condensed water that mixer and temperature and humidity regulator are recycled is for cooling down smoke temperature.To reduce the flue-gas temperature in partial pressure of oxygen and burner hearth in combustion air.The present invention has system water consume low, and air inlet humidity regulation is sensitive, combustion gas NOXThe significant advantage of emission reduction effect.
Description
Technical field
The present invention relates to a kind of warm and humid coupling gas fired-boiler low nitrogen burning system and operation methods, belong to cogeneration of heat and power technology
Field.
Background technique
Energy restructuring is the important means of air contaminant treatment, the following increase with clean energy resource specific gravity, naturally
Gas dosage will also quickly increase.The Air Pollutants of combustion of natural gas discharge are NOx, therefore, natural gas low nitrogen burning skill
Art is the important technology guarantee of China's scale clean utilization natural gas.Natural gas is widely used in work as a kind of clean fuel
The fields such as industry production and resident's heat supply.With Environmental Protection in China require it is increasingly strict, to gas fired-boiler discharged nitrous oxides limit
Also higher and higher, some importance regional requirements create gas fired-boiler nitrogen oxide emission and are lower than 30mg/Nm3, this is fired to low nitrogen
Burning technology brings great challenge.
Therefore, the low-NO_x combustion technology for researching and developing more low emissions levels not only contributes to realize that the stabilization of existing gas fired-boiler reaches
Mark discharge, while NO can also be further decreasedXDischarge provides guarantee for realizing that PM2.5 concentration further decreases.
Natural gas main component is methane, and content is generally even higher in 95-97%, is substantially free of fuel bound nitrogen, is firing
During burning mainly based on heating power type and Quick-type NOx.Thermal NO x is the N in air2At high temperature by O2Oxidation generates
NOx, account for about NOx generate total amount 90-95%, be combustion of natural gas NOx control important constructive ways.
Dilute the method for flame to reduce flue-gas temperature be current widely used low-NO_x combustion technology, again such as flue gas
Circulation, air wetting technology.The addition of flue gas recycled reduces combustion air partial pressure of oxygen, so that burn rate is reduced, furnace
Flame temperature is also reduced, and the production quantity of thermal NO x is controlled effectively.However, with the increasing of amount of circulating gas
Greatly, the oxygen in air is constantly diluted, simultaneously because the increase of air mass flow, causes burner flow field to change, Yi Yinqi
Flame combustion it is unstable, or lead to the too long of flame, influence boiler and operate normally and safety.Therefore, how flue gas is solved
It is to further decrease natural gas when recirculation rate further increases the problems such as combustion stability, condensed water precipitation and boiler efficiency
And other gas fuel combustions NOXThe key of discharge.
Air wetting is filled the water to flame zone to reduce combustion zone temperature and can play the work for inhibiting thermal NO x to generate
With, however humidifying technology is resulted in the technical application and is restricted due to the source of water and recycling problem.Such as patent document
In CN108613173A, the heat source heated using gas between air and flue gas-gas heat exchange as air, while being sprayed in heat exchanger entrance
Enter boiler blow-down water, flue gas recycled is added in heat exchanger exit.In patent document CN106500120A, also with gas-gas heat exchange into
The heating of row air, and using condensed water come humidifying air, however, gas-gas heat exchange needs biggish temperature end poor in above scheme
Cause flue gas waste heat recovery heat and condensation water quantity less, the humidity in air and huge heat exchanger can not be greatly improved
Size limits the utilization of the technical solution, while cannot be considered in terms of the contradictory problems between ultralow nitrogen and combustion stability.
Summary of the invention
The present invention is intended to provide a kind of warm and humid coupling gas fired-boiler low nitrogen burning system and operation method.Burning fire can be stablized
Flame is greatly lowered NO_x formation, and agglomerates the waste heat and moisture content in water collection device depth recovered flue gas by phase transformation, effectively
It saves water, improves boiler efficiency.
The invention is realized by the following technical scheme:
A kind of warm and humid coupling gas fired-boiler low nitrogen burning system, including gas fired-boiler, phase transformation agglomerate water collection device, warm and humid adjusting
Device, mixer and pressure fan；The gas fired-boiler includes the burner hearth and convection heating surface being sequentially connected；The burner hearth interior forward end
It is provided with burner；The phase transformation cohesion water collection device is arranged between the convection heating surface and the temperature and humidity regulator, described
Cigarette air pipe line is respectively equipped between phase transformation cohesion water collection device and the convection heating surface to be connected with heat-exchange working medium pipeline；The phase transformation
It is formed and is connected by circulation between cohesion water collection device and the temperature and humidity regulator；The temperature and humidity regulator is connected with the mixer；Institute
The cigarette air pipe line stated between mixer and phase transformation cohesion water collection device and the convection heating surface passes through gas recirculating fan
It is connected, and the mixer is connected with the burner；The temperature and humidity regulator, phase transformation cohesion water collection device and convection heating surface it
Between be equipped with heat-exchange working medium pipeline be connected；The pressure fan be connected between the mixer and burner or the mixer and temperature
Between wet adjuster.
In above-mentioned technical proposal, high-level water storage case is provided between the phase transformation cohesion water collection device and the temperature and humidity regulator
With high-order water pump, the circuit between the temperature and humidity regulator and phase transformation cohesion water collection device is equipped with low level water tank and low level
Water pump.
In above-mentioned technical proposal, the mixer includes air inlet pipe, escape pipe and setting between air inlet pipe and escape pipe
Mixing chamber and the flue gas recycled inlet tube and condensate pipe that are arranged on mixing chamber；The condensate pipe setting is mixing
Bottom of chamber portion, and the condensate pipe is connect with the low level water tank.
In above-mentioned technical proposal, the cylinder that the air inlet pipe, escape pipe and the mixing chamber are arranged coaxially, and it is described
Mixing chamber diameter is 1.2~1.5 times of the air inlet pipe diameter；Diffuser is equipped between the air inlet pipe and the mixing chamber to connect
It connects；The flue gas recycled inlet tube is cut from the side circumferential direction of mixing chamber.
In above-mentioned technical proposal, the mixing chamber is externally provided with ring-shaped flue, if being evenly distributed with dry flue gas on ring-shaped flue
Spout, the flue gas spout connect the ring-shaped flue and the mixing chamber.
In above-mentioned technical proposal, the flue gas spout is arranged by 50~60m/s of design current velocity.
In above-mentioned technical proposal, be successively arranged in the phase transformation cohesion water collection device phase inversion heat pipe, spraying cooling pipe row and
Labyrinth type water collection device；Several spraying cooling pipes are arranged in the spraying cooling pipe row, and the spraying cooling pipe is in tilted layout, and described
Spraying cooling pipe is provided with several spray ports towards phase inversion heat pipe side, and the spray port injection direction is towards the phase
It converts heat pipe side and tilts upward in 0~30 °；The labyrinth type water collection device setting is exported in phase transformation cohesion water collection device,
Including several V-types being set side by side or I-shaped baffle plate.
In above-mentioned technical proposal, the temperature and humidity regulator entrance is to flow in the divergent segment equipped with several in divergent segment
Orifice plate；Spray humidification pipe row and fin heat exchange tube are additionally provided in the temperature and humidity regulator；The fin heat exchange tube is close to warm and humid tune
The setting of device outlet section is saved, the spray humidification pipe row is in tilted layout towards the temperature and humidity regulator entrance.
A kind of operation method of warm and humid coupling gas fired-boiler low nitrogen burning system, comprising:
Temperature and humidity regulator is admitted air into, spray condensed water is sprayed into temperature and humidity regulator；Make to spray condensed water and air is straight
Contact heat-exchanging is connect, while heating air, a part of condensed water directly evaporates, and another part condensation water drop is carried by air
Continue to exchange heat in temperature and humidity regulator；Make boiler blow-down water enter temperature and humidity regulator to change with the air that carry condensation water drop
Heat is evaporated after making the condensed water drop absorption boiler blow-down water heat in air, while air absorbs temperature raising after heat, and increases
The water vapour in air is added to be saturated partial pressure；
Air after humidification heating is uniformly mixed into mixer with flue gas recycled, the mixing air temperature after making blending
Degree rises to 50~60 DEG C, decrease in oxygen partial pressure to 18~20%,；
Mixing air is sent into burner, makes the combustion of natural gas into burner, generates high-temperature flue gas；High-temperature flue gas warp
The heat exchange of burner hearth and convection heating surface is crossed, flue-gas temperature is reduced to 110~130 DEG C；
Make part of smoke enter mixer as flue gas recycled to mix with air as mixing air；Another part cigarette
Gas enters phase transformation cohesion water collection device and is exchanged heat and removed water, and flue-gas temperature is made to be reduced to 50~60 DEG C, at the same drop collect it is laggard
Enter temperature and humidity regulator as spray condensed water warming and humidifying air；Cooling becomes condensation after spraying condensed water warming and humidifying air
Water is sent into phase transformation cohesion water collection device after collecting and carries out spraying cooling to flue gas.
In above-mentioned technical proposal, the flue gas recycled amount is the 5~10% of amount of flue gas emission.
The present invention has the following advantages and beneficial effects: 1) being heated, can be prevented cold to air by temperature and humidity regulator
Air directly mixes with flue gas recycled and generates condensed water；2) addition of flue gas recycled is by the combustion air oxygen of burner inlet
Content is reduced to 18~20%, is reducing flame combustion rate simultaneously, and effectively cooling furnace flame temperature finally reduces heating power
The generation of type NOx；3) purpose of spray humidification is to increase three original in combustion air in the case where guaranteeing combustion air oxygen content
Sub- gas content, the specific heats of gases, which are held, to increase, and further decreases combustion flame temperature；4) water collection device is agglomerated in temperature and humidity regulator, phase transformation
It is indirectly and directly exchanged heat by gas-liquid, heat exchange efficiency is high, and heat exchanger structure is compact；5) it sprays water used and arises directly from flue gas
Condensed water saves water, while the moisture in recovered flue gas, can eliminate the white cigarette in chimney；6) wet in air by increasing
Degree reduces the partial pressure of oxygen in air, under the two coupling, is realizing that (NOx emission is lower than 15mg/Nm to super low nitrogen burning3(@
3.5%) while), the stability of combustion flame can be increased.
Detailed description of the invention
Fig. 1 is a kind of warm and humid coupling gas fired-boiler low nitrogen burning system schematic of arrangement according to the present invention.
Fig. 2 is the warm and humid coupling gas fired-boiler low nitrogen burning system signal of another arrangement according to the present invention
Figure.
Fig. 3 is that water collection device structural schematic diagram is agglomerated in phase transformation according to the present invention.
Fig. 4 is temperature and humidity regulator structural schematic diagram according to the present invention.
Fig. 5 is the mixer structure schematic diagram of one of embodiment according to the present invention.
Fig. 6 is the mixer structure schematic diagram of another embodiment according to the present invention: a) cross-sectional view；b)
Structural schematic diagram.
In figure: 1-air inlet adjustment valve；2-burner hearths；3-convection heating surfaces；Water collection device is agglomerated in 4-phase transformations；41-phase inversion heat pipes；
42-spraying cooling pipes row；43-labyrinth type water collection devices；44-condensed waters receive the mouth of a river；5-flue gas recirculation regulating valves；6-flue gases follow again
Ring blower；7-temperature and humidity regulators；71-fin heat exchange tubes；72-spray humidification pipe rows；73-uniform flow orifices；74-receive the mouth of a river；8-send
Blower；9-mixers；91-air inlet pipe；92-diffusers；93-flue gas recycled inlet tubes；94-condensate pipes；95-annular air distributions
Pipe；96-flue gas spouts；97-mixing chambers；98-escape pipes；10-high-level water storage casees；11-high-order water pumps；12-low level water tanks；
13-low level water pumps；14-regulating valves.
Specific embodiment
A specific embodiment of the invention and the course of work are further described with reference to the accompanying drawing.
The positional terms such as the upper, lower, left, right, front and rear in present specification be positional relationship based on the figure and
It establishes.Attached drawing is different, then corresponding positional relationship is also possible to change therewith, therefore cannot be interpreted as with this to protection model
The restriction enclosed.
As depicted in figs. 1 and 2, a kind of warm and humid coupling gas fired-boiler low nitrogen burning system, including gas fired-boiler, phase transformation cohesion
Water collection device 4, temperature and humidity regulator 7, mixer 9 and pressure fan 8.Gas fired-boiler includes sequentially connected burner hearth 2 and convection heating surface
3.2 interior forward end of burner hearth is provided with burner.Phase transformation agglomerate the setting of water collection device 4 convection heating surface 3 and temperature and humidity regulator 7 it
Between.Cigarette air pipe line is respectively equipped between phase transformation cohesion water collection device 4 and convection heating surface 3 to be connected with heat-exchange working medium pipeline.Phase transformation is solidifying
It is formed and is connected by circulation between poly- water collection device 4 and temperature and humidity regulator 7.Temperature and humidity regulator 7 is also connected with mixer 9.Mixer 9 and phase
The cigarette air pipe line become between cohesion water collection device 4 and convection heating surface 3 is connected by gas recirculating fan 6, flue gas recirculation wind
Flue gas recirculation regulating valve 5 is provided between machine 6 and cigarette air pipe line.Mixer 9 is connected with burner.Temperature and humidity regulator 7, phase transformation
It agglomerates and is connected between water collection device 4 and convection heating surface 3 equipped with heat-exchange working medium pipeline.Pressure fan be connected to mixer and burner it
Between between (Fig. 1) or mixer and temperature and humidity regulator (Fig. 2).Air inlet adjustment valve 1 is additionally provided with before burner inlet, for adjusting
Save total blast volume.
High-level water storage case 10 and high-order water pump 11, warm and humid tune are provided between phase transformation cohesion water collection device 4 and temperature and humidity regulator 7
The circuit saved between device 7 and phase transformation cohesion water collection device 4 is equipped with low level water tank 12 and low level water pump 13.
As shown in figure 4, flowing first rear direction by air-flow in phase transformation cohesion water collection device 4 is successively arranged phase inversion heat pipe 41, spray
Drench cooling pipe row 42 and labyrinth type water collection device 43.42 several spraying cooling pipes of setting of spraying cooling pipe row, the inclination of spraying cooling pipe
Arrangement, and spraying cooling pipe is provided with several spray ports towards 41 side of phase inversion heat pipe, spray port injection direction is towards phase transformation
It 41 side of heat exchanger tube and tilts upward in 0~30 °.The setting of labyrinth type water collection device 43 is exported in phase transformation cohesion water collection device 4, if including
The dry V-type being set side by side or I-shaped baffle plate.
As shown in figure 5,7 entrance of temperature and humidity regulator is to be equipped with several uniform flow orifices 73 in divergent segment in divergent segment, make air
What is be evenly distributed enters temperature and humidity regulator 7.Spray humidification pipe row 72 and fin heat exchange tube 71 are additionally provided in temperature and humidity regulator 7.Fin
Piece heat exchanger tube 71 is arranged close to 7 outlet section of temperature and humidity regulator.Spray humidification pipe row 72 tilts cloth towards 7 entrance of temperature and humidity regulator
It sets.Spray humidification pipe row 72 includes several sprays humidification pipe, the spout that several directions come gas direction is provided with, by condensed water
Inclination sprays to air-flow.
Mixer 9 includes air inlet pipe 91, escape pipe 98 and the mixing chamber 97 being arranged between air inlet pipe 91 and escape pipe 98
And flue gas recycled inlet tube 93 and condensate pipe 94 on mixing chamber 97 are set.Condensate pipe 94 is arranged in mixing chamber 97
Bottom, and condensate pipe 94 is connect with the low level water tank 12.
One of technical solution is as shown in figure 5, what air inlet pipe 91, escape pipe 98 and the mixing chamber 97 were arranged coaxially
Cylinder, and 97 diameter of the mixing chamber is 1.2~1.5 times of 91 diameter of air inlet pipe；The air inlet pipe 91 is mixed with described
It closes and is equipped with the connection of diffuser 92 between chamber 97；The flue gas recycled inlet tube 93 is cut from the side circumferential direction of mixing chamber 97.
Another technical solution is as shown in Figure 6.Mixing chamber 97 is externally provided with ring-shaped flue 95, at this time 91/ escape pipe of air inlet pipe
98 with the cross section of mixing chamber 97 can be round or rectangle, and corresponding ring-shaped flue 95 is also circular ring shape or rectangular loop.Rectangle
Section is as shown in Figure 6 a.If being evenly distributed with dry flue gas spout 96 on ring-shaped flue 95, flue gas spout 96 connects ring-shaped flue 95
With mixing chamber 97.Fig. 6 b shows the mixer of rectangular section.Flue gas spout 96 is arranged by 50~60m/s of design current velocity.
It passes air through after uniform flow orifice 73 is evenly distributed with and enters temperature and humidity regulator 7；Spray condensed water is passed through into spray humidification pipe
Row 72 sprays into temperature and humidity regulator 7.Make to spray condensed water and air direct contact heat transfer, while heating air, a part condensation
Water directly evaporates, and another part condensation water drop is carry by air to be continued in the fin heat exchange tube 71 of temperature and humidity regulator 7
Heat exchange；So that boiler blow-down water is entered the fin heat exchange tube 71 of temperature and humidity regulator 7 and the air heat-exchange that carry condensation water drop, makes sky
It is evaporated after condensed water drop absorption boiler blow-down water heat in gas, while air absorbs temperature raising after heat, and increases air
In water vapour be saturated partial pressure.The boiler blow-down water amount for entering temperature and humidity regulator 7 is adjusted by regulating valve 14, and warm and humid adjusting is adjusted
The air that device 7 exports is to 30~50 DEG C.
Air after humidification heating is uniformly mixed into mixer 9 with flue gas recycled, the mixing air after making blending
Temperature rises to 50~60 DEG C, decrease in oxygen partial pressure to 18-20%.
Mixing air is sent into burner by air inlet adjustment valve 1, makes the combustion of natural gas into burner, generates high temperature
Flue gas；High-temperature flue gas passes through the heat exchange of burner hearth 2 and convection heating surface 3, and flue-gas temperature is reduced to 110~130 DEG C.
Part of smoke is set to pass through flue gas recirculation under the adjusting of flue gas recirculation regulating valve 5 as flue gas recycled
Blower 6 is mixed with air into mixer 9 as mixing air.At this point, adjust flue gas recycled amount be amount of flue gas emission 5~
10%.
Another part flue gas enters phase transformation cohesion water collection device 4, successively by phase inversion heat pipe 41,42 spray of spraying cooling pipe row
The heat exchange of leaching makes flue-gas temperature be reduced to 50~60 DEG C.Drop is collected under flue gas carrying by labyrinth type water collection device 43, simultaneously
Condensed water converges into catch basin 44 in spent shower water, flue gas, is then flowed into high-level water storage case 10, adds by high-order water pump 11
Pressure is sent into the spray humidification pipe row 72 of temperature and humidity regulator 7 as spray condensed water warming and humidifying air.Condensed water heating is sprayed to add
Cooling becomes condensed water after humid air, converges into low level water tank 12.The condensed water in mixer 9 is from condensate pipe 94 simultaneously
Low level water tank 12 is delivered to collect.These condensed waters are sent into phase transformation cohesion water collection device 4 after the pressurization of low level water pump 13 and are sprayed
Spraying cooling is carried out to flue gas in cooling pipe row 42.
Air is heated by temperature and humidity regulator 7, can prevent cold air from directly mixing generation with flue gas recycled solidifying
It bears water.The combustion air oxygen content of burner inlet is reduced to 18~19% by the addition of flue gas recycled, is reducing flame
Simultaneously, effectively cooling furnace flame temperature finally reduces the generation of thermal NO x to burn rate.Spraying the purpose being humidified is then
In the case where guaranteeing combustion air oxygen content, increase three atomic gas contents in combustion air, the specific heats of gases, which are held, to increase, into one
Step reduces combustion flame temperature.By the humidity in increase air, the partial pressure of oxygen in air is reduced, under the two coupling,
Realize that (NOx emission is lower than 15mg/Nm to super low nitrogen burning3(@3.5%)) while, the stability of combustion flame can be increased.
Boiler blow-down water can be transported to fin heat exchange tube 71, the phase-change heat-exchange of temperature and humidity regulator 7 by heat-exchange working medium pipeline
The phase inversion heat pipe 41 and convection heating surface 3 of pipe 4, after successively exchanging heat again for users to use.Tune is provided on heat-exchange working medium pipeline
It saves valve and carries out flow adjusting distribution.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of warm and humid coupling gas fired-boiler low nitrogen burning system, which is characterized in that the low nitrogen burning system includes gas-fired boiler
Furnace, phase transformation cohesion water collection device (4), temperature and humidity regulator (7) and mixer (9)；The gas fired-boiler includes the burner hearth being sequentially connected
(2) and convection heating surface (3)；Burner hearth (2) interior forward end is provided with burner；Phase transformation cohesion water collection device (4) setting
Between the convection heating surface (3) and the temperature and humidity regulator (7), phase transformation cohesion water collection device (4) and the convection current by
Cigarette air pipe line is respectively equipped between hot face (3) to be connected with heat-exchange working medium pipeline；Phase transformation cohesion water collection device (4) with it is described warm and humid
It is formed and is connected by circulation between adjuster (7)；The temperature and humidity regulator (7) is connected with the mixer (9)；The mixer (9)
Cigarette air pipe line between phase transformation cohesion water collection device (4) and the convection heating surface (3) passes through gas recirculating fan (6)
It is connected, and the mixer (9) is connected with the burner；The temperature and humidity regulator (7), phase transformation cohesion are water collection device (4) and right
It flows and is connected between heating surface (3) equipped with heat-exchange working medium pipeline.
2. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 1, which is characterized in that the phase transformation
High-level water storage case (10) and high-order water pump (11), the temperature are provided between cohesion water collection device (4) and the temperature and humidity regulator (7)
Circuit between wet adjuster (7) and phase transformation cohesion water collection device (4) is equipped with low level water tank (12) and low level water pump
(13)。
3. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 2, which is characterized in that the mixing
Device (9) includes air inlet pipe (91), escape pipe (98) and the mixing chamber (97) being arranged between air inlet pipe (91) and escape pipe (98)
And the flue gas recycled inlet tube (93) and condensate pipe (94) being arranged on mixing chamber (97)；The condensate pipe (94) sets
It sets in mixing chamber (97) bottom, and the condensate pipe (94) is connect with the low level water tank (12).
4. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 3, which is characterized in that the air inlet
The cylinder that pipe (91), escape pipe (98) are arranged coaxially with the mixing chamber (97), and the mixing chamber (97) diameter is institute
1.2~1.5 times for stating air inlet pipe (91) diameter；Diffuser (92) are equipped between the air inlet pipe (91) and the mixing chamber (97)
Connection；The flue gas recycled inlet tube (93) is cut from the side circumferential direction of mixing chamber (97).
5. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 3, which is characterized in that the mixing
Chamber (97) is externally provided with ring-shaped flue (95), ring-shaped flue (95) if on be evenly distributed with dry flue gas spout (96), flue gas spray
Mouth (96) connects described ring-shaped flue (95) and the mixing chamber (97).
6. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 5, which is characterized in that the flue gas
Spout (96) is arranged by 50~60m/s of design current velocity.
7. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 1, which is characterized in that the phase transformation
Phase inversion heat pipe (41), spraying cooling pipe row (42) and labyrinth type water collection device (43) are successively arranged in cohesion water collection device (4)；It is described
Spraying cooling pipe arranges (42) and several spraying cooling pipes is arranged, and the spraying cooling pipe is in tilted layout, and spraying cooling pipe court
Phase inversion heat pipe (41) side is provided with several spray ports, the spray port injection direction is towards the phase inversion heat pipe
(41) it side and tilts upward in 0~30 °；Labyrinth type water collection device (43) setting goes out in phase transformation cohesion water collection device (4)
Mouthful, including several V-types being set side by side or I-shaped baffle plate.
8. the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 1, which is characterized in that described warm and humid
Adjuster (7) entrance is to be equipped with several uniform flow orifices (73) in the divergent segment in divergent segment；In the temperature and humidity regulator (7)
It is additionally provided with spray humidification pipe row (72) and fin heat exchange tube (71)；The fin heat exchange tube (71) goes out close to temperature and humidity regulator (7)
Mouth section setting, the spray humidification pipe row (72) are in tilted layout towards the temperature and humidity regulator (7) entrance.
9. a kind of operation method of warm and humid coupling gas fired-boiler low nitrogen burning system, using as described in claim 1 a kind of
Warm and humid coupling gas fired-boiler low nitrogen burning system, which is characterized in that the described method includes:
Temperature and humidity regulator (7) are admitted air into, spray condensed water is sprayed into temperature and humidity regulator (7)；Make to spray condensed water and air
Direct contact heat transfer, while heating air, a part of condensed water directly evaporates, and another part condensation water drop is taken by air
Continue to exchange heat in temperature and humidity regulator (7)；Boiler blow-down water is set to enter temperature and humidity regulator (7) and carry condensation water drop
Air heat-exchange evaporates after making the condensed water drop absorption boiler blow-down water heat in air, while air absorbs temperature liter after heat
Height, and increase the saturation partial pressure of the water vapour in air；
Air after humidification heating is uniformly mixed into mixer (9) with flue gas recycled, the mixing air after making blending
Temperature raising, decrease in oxygen partial pressure；
Mixing air is sent into burner, makes the combustion of natural gas into burner, generates high-temperature flue gas；High-temperature flue gas passes through furnace
The heat exchange of thorax (2) and convection heating surface (3), flue-gas temperature reduce；
Make part of smoke enter mixer (9) as flue gas recycled to mix with air as mixing air；Another part cigarette
Gas enter phase transformation cohesion water collection device (4) exchanged heat and removed water, reduce flue-gas temperature, at the same drop collect after enter warm and humid tune
Device (7) are saved as spray condensed water warming and humidifying air；Cooling becomes condensed water after spraying condensed water warming and humidifying air, collects
It is sent into phase transformation cohesion water collection device (4) afterwards and spraying cooling is carried out to flue gas.
10. the operation method of the warm and humid coupling gas fired-boiler low nitrogen burning system of one kind according to claim 9, feature exist
In the flue gas recycled amount is the 5~10% of amount of flue gas emission.
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| CN201910012938.8A CN109579008B (en) | 2019-01-07 | 2019-01-07 | Low-nitrogen combustion system of temperature-humidity coupled gas-fired boiler and operation method |
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| CN111981505A (en) * | 2020-07-09 | 2020-11-24 | 北京建筑大学 | Low-nitrogen gas boiler efficiency-increasing and white-removing integrated heating system and regulation and control method |
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