CN110145756B - Flue gas whitening system of heating boiler - Google Patents
Flue gas whitening system of heating boiler Download PDFInfo
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- CN110145756B CN110145756B CN201910469197.6A CN201910469197A CN110145756B CN 110145756 B CN110145756 B CN 110145756B CN 201910469197 A CN201910469197 A CN 201910469197A CN 110145756 B CN110145756 B CN 110145756B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000003546 flue gas Substances 0.000 title claims abstract description 119
- 230000002087 whitening effect Effects 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 title claims abstract description 48
- 239000008236 heating water Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 79
- 238000002156 mixing Methods 0.000 claims description 32
- 239000010865 sewage Substances 0.000 claims description 19
- 239000002826 coolant Substances 0.000 claims description 18
- 238000007599 discharging Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims description 2
- 230000008014 freezing Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 3
- 230000006978 adaptation Effects 0.000 claims 1
- 230000003020 moisturizing effect Effects 0.000 claims 1
- 238000009833 condensation Methods 0.000 abstract description 8
- 230000005494 condensation Effects 0.000 abstract description 8
- 239000000779 smoke Substances 0.000 description 16
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
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- 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
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides a flue gas whitening system of a heating boiler, and belongs to the technical field of boilers. The problems of poor whitening effect and insufficient stability of the existing heating boiler are solved. The flue gas whitening system of the heating boiler comprises a boiler body and a chimney, and is characterized in that a primary energy saver, a secondary energy saver, a condenser, a condensing device, a preheating whitening device, a mixed accelerating device and the chimney are sequentially connected between the boiler body and the chimney, a primary heating water circulation pipeline is arranged between the boiler body and the primary energy saver, a secondary heating water circulation pipeline is arranged between the secondary energy saver and the condenser, and an air pipeline for introducing preheated air is connected to the mixed accelerating device. The temperature of the boiler flue gas is reduced below the condensation point by arranging more than three groups of heat exchangers, so that the moisture in the flue gas is separated out, and the flue gas can be effectively whitened.
Description
Technical Field
The invention belongs to the technical field of boilers, and relates to a hot water heating boiler, in particular to a flue gas whitening system of a heating boiler.
Background
In the existing boiler flue gas treatment system, flue gas generated by a boiler is discharged into the atmosphere through a chimney after passing through an air preheater, a dust remover, an induced draft fan and a desulfurization absorption tower in sequence; part of the flue gas waste heat can be recovered in the air preheater supplying air to the boiler, but the problems of low temperature corrosion and the like of the air preheater are solved, the flue gas discharged from the outlet of the air preheater is still high in temperature, so that the flue gas entering the desulfurizing tower is still high in temperature, the desulfurizing slurry in the absorbing tower absorbs a large amount of latent heat of vaporization, part of water is evaporated and discharged into the atmosphere along with the flue gas, and in addition, a large amount of latent heat of vaporization carried by water vapor and sensible heat carried by the flue gas are discharged into the atmosphere due to the high temperature of the flue gas discharged into the atmosphere, so that energy loss is caused, a large amount of water is carried, water loss and environmental pollution are caused, and serious chimney white smoke phenomenon is formed. Retrieved, e.g. chinese patent literature [ authorized bulletin number: authorized bulletin number: CN208365564U discloses a boiler flue gas energy-saving and whitening device, which is characterized in that the boiler flue gas energy-saving and whitening device comprises a boiler, an air preheater, a dust remover, a draught fan, a desulfurization absorption tower and a chimney which are sequentially connected with the boiler through a flue, wherein the air preheater is connected with an air inlet and a blower of the boiler through an air supply pipeline, an inlet or an outlet of the blower is provided with an air supply heater, the air supply heater is provided with a heating medium water inlet and a heating medium water outlet, and a flue gas waste heat exchanger and a heating medium water cooling device are sequentially connected between the heating medium water inlet and the heating medium water outlet through the heating medium water pipeline. Although the heat recovery and white smoke elimination effects can be achieved, the exhaust of a chimney is inconvenient due to the fact that the temperature of the condensed smoke is too low, and the exhaust efficiency and the exhaust effect are affected; in addition, FGR flue gas generated by the flue gas has a large amount of moisture due to the fact that the mixed air is easy to reach the dew point temperature after being mixed with cold air due to the high temperature.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a flue gas whitening system of a heating boiler, which aims at solving the technical problems of improving the flue gas whitening effect and stability of the boiler.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a heating boiler's flue gas white system that disappears, includes boiler body and chimney, its characterized in that, connect gradually one-level energy-saving appliance, second grade energy-saving appliance, condenser, condensing equipment, preheat white device, mix and promote device and chimney between boiler body and the one-level energy-saving appliance, be provided with one-level heating water circulation pipeline between boiler body and the one-level energy-saving appliance, be provided with second grade heating water circulation pipeline between second grade energy-saving appliance and the condenser, be connected with the air line that is used for introducing preheated air on the mix and promote the device.
In the flue gas whitening system of the heating boiler, a precooling device is arranged on the air pipeline, and a cooling medium water circulation pipeline which is sequentially and circularly connected is arranged among the precooling device, the condensing device and the preheating and whitening device. The precooling device is used for heating the normal-temperature air with the temperature of less than 0 ℃.
In the flue gas whitening system of the heating boiler, the air pipeline is connected with the external atmosphere.
In the flue gas whitening system of the heating boiler, an induced draft fan is arranged on the air pipeline, a flue gas pressure sensor for adjusting the output frequency of the induced draft fan is arranged between the mixed speed-increasing device and the preheating whitening device, and the mixed speed-increasing device is connected with the induced draft fan. The frequency conversion induced draft fan is through flue gas smoke pressure sensor signal of telecommunication, and the preheated air volume of entering the induced draft fan is adjusted to the frequency conversion to through the mixed velocity of flow of preheated air adjustment flue gas, reach and control overall flue gas discharge pressure balance's purpose.
In the flue gas whitening system of the heating boiler, a frequency conversion circulating pump for controlling flow temperature is arranged at an inlet of the precooling device positioned at the front end of the cooling medium water circulating pipeline, a temperature sensor is arranged on a flue gas pipeline between the condensing device and the preheating whitening device, the temperature sensor is connected with the frequency conversion circulating pump through an electric signal, and the temperature sensor is used for adjusting the flow of the frequency conversion circulating pump through frequency conversion to achieve a flue gas temperature set point.
In the flue gas whitening system of the heating boiler, a cooling medium water injection pipeline is connected to a cooling medium water circulation pipeline between the preheating whitening device and the precooling device, and the cooling medium water injection pipeline is used for injecting low-freezing-point cooling medium water meeting local climate conditions.
In the flue gas whitening system of the heating boiler, a flue gas taking device is arranged on a flue gas pipeline between the condensing device and the preheating whitening device, a jet-suction mixing device is arranged between the flue gas taking device and the boiler body, the air pipeline is divided into a first air branch and a second air branch after passing through the precooling device, the first air branch is connected with the mixing accelerating device, the second air branch is connected with the jet-suction mixing device, and a flow regulating valve is arranged on the second air branch.
In the flue gas whitening system of the heating boiler, the induced draft fan is arranged on the first air branch, and a blower is further arranged between the jet-suction mixing device and the boiler body.
In the flue gas whitening system of the heating boiler, the boiler body is connected with the sewage disposal device and the cold water tank, the sewage disposal device is connected with the sewage disposal pipe for discharging sewage, a sewage disposal heat recovery pipeline is arranged between the cold water tank and the sewage disposal device, and the cold water tank is connected with the secondary heating water circulation pipeline through a system water supplementing pipeline.
In the flue gas white eliminating system of the heating boiler, the first-level heating water circulation pipeline comprises a first-net heating water supply pipeline and a first-net heating return pipeline which are matched, the first-net heating water supply pipeline is connected with the boiler body, the first-net heating return pipeline is connected with the first-level energy saver, a second-net return pipeline is further arranged between the first-level energy saver and the boiler body, the second-level heating water circulation pipeline comprises a second-net heating water supply pipeline and a second-net heating return pipeline which are matched, the second-net heating water supply pipeline is connected with the second-level energy saver, the second-net heating return pipeline is connected with the condenser, a second-net return pipeline is further arranged between the condenser and the second-level energy saver, and the system water supplementing pipeline is connected with the second-net heating return pipeline. The system water supplementing pipeline is a constant-pressure water supplying pipeline.
In the flue gas whitening system of the heating boiler, the secondary energy-saving device, the condenser and the condensing device are connected with the flue gas condensate water discharging device together, and the flue gas condensate water discharging device is connected with a drainage pipeline for discharging flue gas condensate water and a steam exhaust pipeline for discharging supersaturated steam.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, more than three groups of heat exchangers are arranged, so that the temperature of the boiler flue gas is reduced below the condensation point, and the moisture in the flue gas is separated out, so that the flue gas can be effectively whitened;
2. according to the invention, after the flue gas is condensed, the flue gas is heated by heat released by condensation, so that the temperature of the flue gas is increased, if the temperature of the flue gas is insufficient, a flue gas accelerating device is manufactured in a flue, and a part of preheating air quantity is properly added by a draught fan, so that the temperature of the flue gas is further increased, and the flue gas chimney emission is facilitated;
3. the FGR flue gas required by low nitrogen in the invention is extracted through the rear of the condenser, so that water molecules in the flue gas are basically eliminated, the temperature is reduced, and a large amount of moisture brought by the fact that the mixed air reaches the dew point temperature after the high-temperature flue gas is mixed with the cold air is basically eliminated;
4. according to the invention, the jet-suction device is arranged in the air pipeline, so that FGR flue gas is smoothly mixed into the air, and the phenomenon of air pressure fluctuation caused by air pressure or high or low pressure is avoided.
Drawings
Fig. 1 is a system schematic diagram of the present invention.
Fig. 2 is a schematic structural view of the hybrid acceleration device of the present invention.
Fig. 3 is a schematic view of the structure of the heat exchanger of the present invention.
Fig. 4 is a schematic water flow diagram of a heat exchanger in accordance with the present invention.
Fig. 5 is a schematic view of another form of heat exchanger water flow in accordance with the present invention.
Fig. 6 is a schematic structural view of the smoke extraction device of the present invention.
Fig. 7 is a schematic structural view of the jet-suction mixing device in the present invention.
Fig. 8 is a schematic diagram of the mixing principle of the jet-suction mixing device in the invention.
Fig. 9 is a schematic diagram of a mixing principle of another form of the jet-suction mixing device in the present invention.
In the figure, 1, a boiler body; 2. a chimney; 3. a primary economizer; 4. a secondary economizer; 5. a condenser; 6. a condensing device; 7. preheating and whitening device; 8. a mixing acceleration device; 9. an air line; 10. a precooling device; 11. a temperature sensor; 12. a coolant water injection pipeline; 13. a variable frequency circulating pump; 14. a smoke taking device; 15. a jet-suction mixing device; 16. a first air branch; 17. a second air branch; 18. a flow regulating valve; 19. a blower; 20. a sewage disposal device; 21. a cold water tank; 22. a blow-down pipe; 23. a blowdown heat recovery pipeline; 24. a system water supplementing pipeline; 25. a net heating water supply pipeline; 26. a net heating water return pipeline; 27. a net return water pipeline; 28. two-net heating water supply pipeline; 29. two-net heating water return pipeline; 30. two-net water return pipeline; 31. a flue gas condensate water discharge device; 32. a drainage pipeline; 33. a steam exhaust pipeline; 34. a natural gas supply line; 35. a smoke pressure sensor; 36. an induced draft fan; 37. an air pressure sensor.
Description of the embodiments
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Referring to fig. 1, the embodiment is a flue gas whitening system of a heating boiler, which comprises a boiler body 1 and a chimney 2, wherein a natural gas supply pipeline 34 is connected to the boiler body 1, a primary economizer 3, a secondary economizer 4, a condenser 5, a condensing device 6, a preheating and whitening device 7, a mixing accelerating device 8 and the chimney 2 are sequentially connected between the boiler body 1 and the chimney 2, a primary heating water circulation pipeline is arranged between the boiler body 1 and the primary economizer 3, a secondary heating water circulation pipeline is arranged between the secondary economizer 4 and the condenser 5, an air pipeline 9 for introducing preheated air through a draught fan 36 is connected to the mixing accelerating device 8, the air pipeline 9 is connected with the outside atmosphere, a precooling device 10 is arranged on the air pipeline 9, a closed cooling medium water circulation pipeline which is sequentially and circularly connected is arranged among the precooling device 10, the condensing device 6 and the preheating and whitening device 7, an induced draft fan 36 is arranged on the air pipeline 9, a temperature sensor 11 for controlling the frequency of the induced draft fan 36 is arranged on the cooling medium water circulation pipeline, the temperature sensor 11 is arranged between the precooling device 10 and the preheating and whitening device 7, the sampling end of the temperature sensor 11 is arranged on a flue gas pipeline between the condensing device 6 and the preheating and whitening device 7, a cooling medium water circulation pipeline between the preheating and whitening device 7 and the precooling device 10 is connected with a cooling medium water injection pipeline 12, antifreeze or alcohol is added in injected condensed water, a variable frequency circulation pump 13 controlled by variable frequency is connected to the inlet of the precooling device 10 at the front end of the cooling medium water circulation pipeline, the variable frequency circulation pump 13 is connected with the temperature sensor 11, the temperature sensor 11 is used for adjusting the flow of the variable frequency circulation pump 13 through variable frequency to reach a flue gas temperature set point, further, the boiler body 1 is connected with a sewage disposal device 20 and a cold water tank 21, the sewage disposal device 20 is connected with a sewage disposal pipe 22 for sewage disposal, a sewage disposal heat recovery pipeline 23 is arranged between the cold water tank 21 and the sewage disposal device 20, and the cold water tank 21 is connected with a system water supplementing pipeline 24 controlled by constant pressure between the two-stage heating water circulating pipelines.
Further, the first-stage heating water circulation pipeline comprises a first-net heating water supply pipeline 25 and a first-net heating water return pipeline 26 which are matched, the first-net heating water supply pipeline 25 is connected with the boiler body 1, the first-net heating water return pipeline 26 is connected with the first-stage economizer 3, a second-net water return pipeline 27 is further arranged between the first-stage economizer 3 and the boiler body 1, the second-stage heating water circulation pipeline comprises a second-net heating water supply pipeline 28 and a second-net heating water return pipeline 29 which are matched, the second-net heating water supply pipeline 28 is connected with the second-stage economizer 4, the second-net heating water return pipeline 29 is connected with the condenser 5, a second-net water return pipeline 30 is further arranged between the condenser 5 and the second-stage economizer 4, and the system water supplementing pipeline 24 is connected with the second-net heating water return pipeline 29. The system water supplementing pipeline 24 is a constant-pressure water supplying pipeline.
Further, the secondary economizer 4, the condenser 5 and the condensing device 6 are connected with a flue gas condensate discharging device 31 together, and the flue gas condensate discharging device 31 is connected with a drainage pipeline 32 for discharging flue gas condensate and a steam exhaust pipeline 33 for discharging supersaturated steam.
Referring to fig. 2, the mixing acceleration device 8 includes a flue gas flow inlet 801, a flue gas mixing outlet 802, and a preheated air inlet 803, the flue gas flow inlet 801 is connected to the preheating and whitening device 7, the flue gas mixing outlet 802 is connected to the chimney 2, the preheated air inlet 803 is located on a pipeline between the flue gas flow inlet 801 and the flue gas mixing outlet 802, and the preheated air inlet 803 is provided with an air baffle 804 disposed obliquely, and the flue gas and the preheated air are mixed and accelerated by an axial flow explosion-proof fan 805.
Referring to fig. 3, the pre-cooling device 10, the condensing device 6 and the pre-heating and whitening device 7 are all heat exchangers, wherein the pre-cooling device 10 is used for heating the air with the normal temperature lower than 0 ℃, and medium water in the pipe flows in from a high position and flows out from a low position, as shown in fig. 5; the condensing device 6 is used for cooling the flue gas, and medium water in the pipe enters from a low place and flows out from a high place, as shown in fig. 4; the preheating and whitening device 7 is used for increasing the temperature of the flue gas, and medium water in the pipe enters from a high position and flows out from a low position, as shown in fig. 5.
Referring to fig. 6, a jet-suction mixing device 15 is arranged between the smoke taking device 14 and the boiler body 1, the air pipeline 9 is divided into a first air branch 16 and a second air branch 17 after passing through the precooling device 10, the first air branch 16 is connected with the mixing accelerating device 8, the second air branch 17 is connected with the jet-suction mixing device 15, a flow regulating valve 18 is arranged on the second air branch 17, a smoke taking device 14 is arranged on a flue gas pipeline between the condensing device 6 and the preheating and whitening device 7, an air pressure sensor 37 electrically connected with the flow regulating valve 18 is arranged between the smoke taking device 14 and the condensing device 6, the flow regulating valve 18 and the air pressure sensor 37 are adapted to realize flow control on the second air branch 17, the smoke taking device 14 is vertically inserted on the flue gas pipeline, the smoke taking device is provided with a smoke taking port 1401 facing the flue gas conveying direction, and a blower 19 is further arranged between the jet-suction mixing device 15 and the boiler body 1. The induced draft fan 36 is arranged on the first air branch 16, and the induced draft fan 36 is in electrical signal connection with the smoke pressure sensor 35 arranged between the preheating and whitening device 7 and the mixing and accelerating device 8, and the smoke pressure sensor 35 is used for adjusting the output power of the induced draft fan 36.
Referring to fig. 7 and 8, the jet-suction mixing device 15 includes a flue gas backflow pipe 1501, a casing 1502 disposed on the second air branch 17, and an air mixing structure disposed inside the casing 1502, where the casing 1502 is a cylindrical structure vertically disposed relative to the second air branch 17, and the casing 1502 has a plurality of mixing holes 1503, the air mixing structure includes a plurality of compression diffusion blocks 1504 disposed at intervals, the flue gas backflow pipe 1501 is vertically connected to the second air branch 17, the cross section of the compression diffusion blocks 1504 is made into a diamond shape, each compression diffusion block 1504 is in a row, and the connection line of each compression diffusion block 1504 is perpendicular to the flow direction of air and the direction of flue gas backflow. In addition, as shown in fig. 9, the cross section of the compression and diffusion block 1504 is formed by an isosceles triangle and a rectangle, the bottom side of the isosceles triangle is connected with the rectangle, the vertex angle of the isosceles triangle faces the air inlet direction of the second air branch 17, an air conditioning plate 1505 and a rotating shaft 1506 are arranged between the compression and diffusion blocks 1504, the rotating shaft 1506 is vertically arranged relative to the second air branch 17, the air conditioning plate 1505 is rotatably connected on the rotating shaft 1506, and the rotating shaft 1506 and the air conditioning plate 1505 are located between two opposite inclined surfaces on the adjacent two compression and diffusion blocks 1504.
The advantages of this embodiment are as follows:
1. the embodiment adopts a flue gas whitening system of condensation, heating, whitening, precooling and mixing, is suitable for a northern heating system, namely an outdoor environment with the temperature lower than the condensation point, and can still effectively perform flue gas whitening;
2. in the embodiment, the temperature of the boiler flue gas is reduced to be lower than the condensation point through more than three groups of heat exchangers, water in the flue gas is separated out, then the flue gas is heated through heat released by condensation, so that the temperature of the flue gas is increased, at the moment, if the temperature of the flue gas is insufficient, a flue gas accelerating device is manufactured in a flue, and a part of preheated air quantity is properly added through a draught fan 36, so that the temperature of the flue gas is further increased, and the flue gas chimney emission is facilitated; meanwhile, the frequency of the induced draft fan is controlled through the smoke pressure sensor 35, so that the pressure balance at the tail part of the flue is ensured, and the combustion safety is ensured. The flue gas heats the cooled medium water, the temperature is further reduced by cold air, the temperature required by condensing the flue gas is obtained, and the flue gas is injected into a flue gas condenser through a circulating pump, so that a circulating process is achieved. The control principle controls the frequency of the circulating pump by detecting the condensing temperature of the flue gas through the temperature sensor 11 so as to control the flow of the medium water and achieve the temperature required by the medium water; in addition, antifreezing solution or alcohol can be added into the medium water to prevent the medium water temperature from being lower than the freezing point temperature when the flue gas condensation needs lower temperature;
3. the FGR flue gas required for low nitrogen is extracted through the rear of the condensing device 6, so that water molecules in the flue gas are basically eliminated, the temperature is reduced, and a large amount of moisture brought by the fact that the mixed air reaches the dew point temperature after the high-temperature flue gas is mixed with the cold air is basically eliminated after the flue gas is mixed with the cold air. In addition, as the low-temperature flue gas and the low-temperature air are mixed, the density of the mixed air is reduced, and the air quantity required by boiler combustion can be selected in a conventional mode: the air quantity plus FGR quantity is used for determining the type of the blower 19, reducing the flow rate of the blower without considering the influence of temperature increase, and amplifying the type of the blower 19;
4. at FGR flue gas extraction point and FGR mixing point, set up respectively and get cigarette device 14 and penetrate and inhale mixing arrangement 15, the atmospheric pressure vibrations phenomenon that FGR flue gas caused through air baffle and FGR flue gas baffle adjustment in-process can be avoided to this kind of design, can drain FGR flue gas and make it mix into in the air smoothly, is unlikely to air pressure or is high or low, causes the atmospheric pressure fluctuation phenomenon.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (5)
1. The flue gas whitening system of the heating boiler comprises a boiler body (1) and a chimney (2), and is characterized in that a primary economizer (3), a secondary economizer (4), a condenser (5), a condensing device (6), a preheating and whitening device (7), a mixed accelerating device (8) and the chimney (2) are sequentially connected between the boiler body (1) and the chimney (2), a primary heating water circulation pipeline is arranged between the boiler body (1) and the primary economizer (3), a secondary heating water circulation pipeline is arranged between the secondary economizer (4) and the condenser (5), an air pipeline (9) for introducing preheated air is connected onto the mixed accelerating device (8), an induced draft fan (36) is arranged on the air pipeline (9), a flue gas pressure sensor (35) for adjusting the output frequency of the induced draft fan (36) is arranged between the mixed accelerating device (8) and the preheating and the whitening device (7), a flue gas taking device (14) is arranged between the condensing device (6) and the preheating and the boiler body (14), the air pipeline (9) is divided into a first air branch (16) and a second air branch (17), the first air branch (16) is connected with a mixing accelerating device (8), the second air branch (17) is connected with a jet-suction mixing device (15), a flow regulating valve (18) is arranged on the second air branch (17), a draught fan (36) is arranged on the first air branch (16), a blower (19) is further arranged between the jet-suction mixing device (15) and the boiler body (1), a sewage draining device (20) and a cold water tank (21) are connected on the boiler body (1), a sewage draining pipe (22) for draining sewage is connected on the sewage draining device (20), a sewage draining heat recycling pipeline (23) is arranged between the cold water tank (21) and the sewage draining device (20), the cold water tank (21) and a second-stage heating water recycling pipeline are connected through a system supplementing pipeline (24), the first-stage heating water recycling pipeline comprises a network (25) and a network (26) which are matched, the first-stage heating pipeline (26) is connected with the water pipe (3), still be provided with one net return water pipeline (27) between one-level energy-saving appliance (3) and the boiler body (1), second grade heating water circulation pipeline includes two net heating supply line (28) and two net heating return water pipeline (29) of looks adaptation, two net heating supply line (28) link to each other with second energy-saving appliance (4), two net heating return water pipeline (29) link to each other with condenser (5), still be provided with two net return water pipeline (30) between condenser (5) and second energy-saving appliance (4), system moisturizing pipeline (24) link to each other with two net heating return water pipeline (29), be provided with precooling apparatus (10) on air pipeline (9), cooling medium water circulation pipeline that circulation links to each other in proper order has between precooling apparatus (10), condensing equipment (6) and preheating white device (7).
2. A flue gas whitening system of a heating boiler according to claim 1, characterized in that the air line (9) is connected to the outside atmosphere.
3. The flue gas whitening system of a heating boiler according to claim 2, characterized in that a frequency conversion circulating pump (13) for controlling the flow temperature is arranged at the inlet of a precooling device (10) positioned at the front end of a cooling medium water circulating pipeline, a temperature sensor (11) is arranged on the flue gas pipeline between the condensing device (6) and the preheating whitening device (7), the temperature sensor (11) is connected with the frequency conversion circulating pump (13) by an electric signal, and the temperature sensor (11) is used for adjusting the flow of the frequency conversion circulating pump (13) through frequency conversion to reach a flue gas temperature set point.
4. A flue gas whitening system for a heating boiler according to claim 3, characterized in that a coolant water circulation line between the pre-heating and whitening means (7, 10) is connected with a coolant water injection line (12), said coolant water injection line (12) being adapted to inject low freezing point coolant water meeting local climate conditions.
5. The flue gas whitening system of a heating boiler according to claim 1 or 2 or 3 or 4, wherein the secondary economizer (4), the condenser (5) and the condensing device (6) are commonly connected with a flue gas condensate water discharge device (31), and the flue gas condensate water discharge device (31) is connected with a drainage pipeline (32) for discharging flue gas condensate water and a steam discharge pipeline (33) for discharging supersaturated steam.
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Address after: No. 1036, Wenhai North Road, Chang'an Town, Haining City, Jiaxing City, Zhejiang Province, 314400 Applicant after: Zhejiang Tefu Development Co.,Ltd. Address before: 314400 No.36 Qichao Road, Chang'an Town (Nongfa District), Haining City, Jiaxing City, Zhejiang Province Applicant before: ZHEJIANG TUFF BOILER Co.,Ltd. |
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