CN117053185A - Transformation system for fire-pressing peak-shaving of circulating fluidized bed boiler - Google Patents
Transformation system for fire-pressing peak-shaving of circulating fluidized bed boiler Download PDFInfo
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- CN117053185A CN117053185A CN202310739599.XA CN202310739599A CN117053185A CN 117053185 A CN117053185 A CN 117053185A CN 202310739599 A CN202310739599 A CN 202310739599A CN 117053185 A CN117053185 A CN 117053185A
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- 230000009466 transformation Effects 0.000 title claims abstract description 10
- 238000003825 pressing Methods 0.000 title claims description 5
- 239000002028 Biomass Substances 0.000 claims abstract description 129
- 239000000463 material Substances 0.000 claims abstract description 69
- 238000003860 storage Methods 0.000 claims abstract description 66
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 claims description 86
- 238000003786 synthesis reaction Methods 0.000 claims description 86
- 230000033228 biological regulation Effects 0.000 claims description 32
- 239000002893 slag Substances 0.000 claims description 20
- 238000009826 distribution Methods 0.000 claims description 18
- 239000000571 coke Substances 0.000 claims description 15
- 238000002407 reforming Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000000197 pyrolysis Methods 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000001035 drying Methods 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 210
- 239000003245 coal Substances 0.000 description 17
- 230000006872 improvement Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012983 electrochemical energy storage Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/20—Apparatus; Plants
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/005—Drying-steam generating means
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a transformation system for a circulating fluidized bed boiler for suppressing fires and regulating peaks, which comprises a circulating fluidized bed boiler, a synthetic gas generating furnace, a synthetic gas storage tank, a biomass material dryer and an induced draft fan, wherein the output end of the synthetic gas generating furnace is connected with the input end of the synthetic gas storage tank, the output end of the synthetic gas storage tank is connected with the synthetic gas input end of the circulating fluidized bed boiler, the steam output end of the circulating fluidized bed boiler is connected with the input end of the induced draft fan, the output end of the induced draft fan is respectively connected with the steam input end of the material dryer and the steam input end of the synthetic gas generating furnace, and the output end of the biomass material dryer is connected with a biomass inlet of the synthetic gas generating furnace. The invention can accelerate the load reduction speed of the unit, prevent the accidents such as tube explosion and the like caused by over-temperature and over-pressure of the heating surface at the side of the boiler, and realize the multistage utilization of energy by drying biomass materials by using Yu Gaowen steam.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a transformation system for the fire suppression and peak regulation of a circulating fluidized bed boiler.
Background
Wind power generation (including land wind and sea wind) and solar power generation in renewable energy sources have the characteristics of intermittence, volatility and randomness, and the peak-to-valley ratio of generated energy is huge, so that the stability of a power grid is poor, and the problem that the large-scale consumption of new energy sources is an urgent problem to be solved in a power system is solved. In order to solve the problem, the energy storage equipment matched with new energy is additionally arranged or the coal motor group is transformed, the investment amount is large in the early stage of energy storage construction, the construction period and the return on investment period are long, and the new energy and large-scale thermal power are matched in proportion, so that the problems of large energy storage investment and grid connection can be solved. And the flexible transformation time of the thermal power is short, the transformation cost is only 10% of the electrochemical energy storage, and the domestic stock is large, thereby being beneficial to increasing the peak regulation capacity and solving the problem of new energy consumption.
The pulverized coal furnace can carry out peak regulation tasks through boiler fine operation adjustment or oxygen-enriched micro-oil combustion technology transformation, but the peak regulation capability is limited and the power generation cost is higher. Another method is the thermocouple modification, such as turbine bypass heating, hot water, electric boiler, electric heat pump heating, etc. However, the thermocouple flexibility modification is generally high in cost, such as the electric boiler modification cost is generally tens of millions of yuan, and the thermocouple has large occupied area, long recovery period and can not realize long-time deep peak shaving. In contrast, the circulating fluidized bed unit which is rapidly developed due to wide fuel adaptability and low pollution emission control cost shows unique superiority in peak shaving.
The heat release of a general pulverized coal furnace mainly comes from the heat of pulverized coal input into a hearth. Once the coal dust supply is reduced, the load is rapidly reduced. In the case of CFB boilers, the main heat is released from a large amount of unburned "instant carbon" in the furnace, rather than the instantaneous addition of coal. The CFB boiler furnace has a considerable heat storage capacity. The CFB boiler has a large number of solid particles at 850-900 ℃ in a strong turbulence state, is more stable in combustion than a common pulverized coal boiler, and has a minimum stable combustion load of 30% -35% without adding oil, so that the CFB boiler has a natural advantage in peak regulation capability compared with the pulverized coal boiler. Peak shaving can be achieved by reforming the circulating fluidized bed boiler and by firing and flaming operations.
In the prior researches, materials in a hearth of the circulating fluidized bed boiler and a material in a material returning device are directly abandoned after being burnt without being treated, which is not only unfavorable for load reduction of a unit and causes a large amount of physical heat loss of ash.
Disclosure of Invention
The invention aims to provide a transformation system for the fire suppression and peak regulation of a circulating fluidized bed boiler, which is used for transforming the original circulating fluidized bed boiler by adding equipment, taking high-temperature slag of a hearth as a heat source, establishing a biomass synthesis gas generation and energy storage system, and transforming and storing waste heat energy, thereby improving the boiler efficiency and the peak regulation capacity of the circulating fluidized bed.
The technical scheme of the invention is as follows: the utility model provides a transformation system of circulating fluidized bed boiler peak regulation that presses fire, includes circulating fluidized bed boiler, synthetic gas generating furnace, synthetic gas holder, biomass material drying-machine and draught fan, the output of synthetic gas generating furnace with the input of synthetic gas holder is connected, the output of synthetic gas holder with the synthetic gas input of circulating fluidized bed boiler is connected, the steam output of circulating fluidized bed boiler pass through the draught fan respectively with material drying-machine steam input and synthetic gas generating furnace are connected, biomass material drying-machine's output with the biomass entry linkage of synthetic gas generating furnace, the synthetic gas generating furnace is used for supplying with circulating fluidized bed boiler through pyrolysis biomass material generation synthetic gas, the synthetic gas holder is used for storing and outputting the synthetic gas, biomass material drying-machine is used for drying biomass material.
Preferably, as a further improvement of the present invention, an air distribution plate is arranged at the bottom of a furnace combustion chamber of the circulating fluidized bed boiler, synthesis gas injection ports are formed at four corners of the air distribution plate, bell-type hoods are distributed at the synthesis gas injection ports, a ring-shaped air supply pipeline is arranged at the inner side of the bottom of the circulating fluidized bed boiler and is positioned at the lower side of the air distribution plate, the ring-shaped air supply pipeline is connected with a synthesis gas input end arranged at the bottom of the circulating fluidized bed boiler, a hot slag output end of the circulating fluidized bed is respectively connected with a furnace rear ash outlet pipe and a return ash outlet pipe, the furnace rear ash outlet pipe is arranged at the upper side of the air distribution plate, the return ash outlet pipe is connected at the bottom of a return feeder, the coal dropping pipe is arranged at the side wall of the circulating fluidized bed boiler and is positioned above the air distribution plate, a high-temperature steam pipe is arranged at the tail of the circulating fluidized bed boiler, and the other end of the high-temperature steam pipe is connected with the input end of the induced draft fan.
Preferably, as a further improvement of the invention, the device further comprises a synthetic gas ring pipe gas supply manual valve, a synthetic gas peak regulation gas supply regulating electric valve, a furnace rear ash outlet manual valve, a furnace rear ash outlet bypass manual valve, a returning ash outlet manual valve and a returning ash outlet bypass manual valve, wherein the synthetic gas ring pipe gas supply manual valve is arranged on the ring type gas supply pipeline, one synthetic gas ring pipe gas supply manual valve is respectively arranged at four corners of the ring type gas supply pipeline, the four synthetic gas ring pipe gas supply manual valves are correspondingly connected with synthetic gas injection ports arranged at four corners of the air distribution plate, the synthetic gas peak regulation gas supply regulating electric valve is positioned at a synthetic gas input end at the bottom of the furnace, the furnace rear ash outlet manual valve and the furnace rear ash outlet bypass manual valve are respectively positioned on a furnace rear ash outlet pipe main bypass, and the returning ash outlet manual valve and the returning ash outlet bypass manual valve are respectively positioned on a returning ash outlet pipe main bypass.
Preferably, as a further improvement of the invention, a surrounding ash drop pipe is arranged outside the hearth of the synthetic gas generating furnace, the ash drop pipe is connected with the hot slag output end of the circulating fluidized bed boiler, a coarse grate is arranged in the synthetic gas generating furnace, a fine grate is arranged at the bucket-shaped lower part of the synthetic gas generating furnace, and the bottommost part of the synthetic gas generating furnace is connected with a biomass coke collecting box.
Preferably, as a further improvement of the invention, a biomass disturbance air pipeline is arranged below the coarse grate, and the biomass disturbance air pipeline surrounds the outer side of the bucket-shaped bottom of the synthesis gas generating furnace and is connected with the high-temperature steam pipe at the tail part of the circulating fluidized bed boiler through an induced draft fan.
Preferably, as a further improvement of the invention, the biomass disturbance wind pipe main path further comprises a biomass disturbance wind outlet manual valve, a biomass disturbance wind outlet electric valve and a biomass disturbance wind outlet bypass manual valve, wherein the biomass disturbance wind outlet manual valve and the biomass disturbance wind outlet electric valve are positioned in the biomass disturbance wind pipe main path; the biomass disturbance air outlet bypass manual valve is located in the biomass disturbance air pipeline branch.
Preferably, as a further improvement of the present invention, the steam input end of the biomass dryer is connected with the high-temperature steam pipe at the tail of the circulating fluidized bed boiler through the induced draft fan, the biomass input end of the biomass dryer is connected with the biomass inlet, and the output end of the biomass dryer is connected with the biomass input end of the synthesis gas generation furnace.
Preferably, as a further improvement of the present invention, the synthetic gas storage tank includes a tank body, a synthetic gas storage pipeline, a drainage pipeline, a synthetic gas peak regulation air supply pipeline, a safety valve, a remote pressure gauge, an on-site pressure gauge and a synthetic gas output pipeline, one end of the synthetic gas storage pipeline is connected with the synthetic gas output end of the synthetic gas generating furnace, the other end of the synthetic gas storage pipeline is connected with the left side of the bottom of the tank body, the drainage pipeline is arranged at the bottom of the tank body, the synthetic gas peak regulation air supply pipeline is arranged on the right side of the bottom of the tank body, the on-site pressure gauge is arranged on the side wall of the tank body, the remote pressure gauge of the gas storage tank is positioned at the top of the tank body, the safety valve of the gas storage tank is arranged on one side of the top of the tank body, one end of the synthetic gas spraying pipeline is connected with the tank body, and the other end of the synthetic gas spraying pipeline is connected with the synthetic gas input end of the circulating fluidized bed boiler.
Preferably, as a further improvement of the present invention, the present invention further includes an air tank inlet manual valve, an inlet bypass manual valve, an air tank steam trap front manual valve, an air tank steam trap rear manual valve, an air tank steam trap bypass manual valve, a synthesis gas peak-shaving air supply valve, a synthesis gas air supply front manual valve, a synthesis gas supply main valve, a synthesis gas air supply rear manual valve, and a synthesis gas air supply bypass manual valve, wherein the air tank inlet manual valve is located in the synthesis gas air storage pipeline main path, the air tank inlet manual valve is located in the synthesis gas air storage pipeline bypass, the air tank steam trap front manual valve, the air tank steam trap, and the air tank steam trap rear manual valve are all disposed in the main path of the water drain pipeline at the bottom of the tank, and are located in three positions, respectively, the air tank steam trap bypass manual valve is disposed on the synthesis gas peak-shaving air supply pipeline, the synthesis gas front manual valve, the synthesis gas supply main valve, the synthesis gas supply rear manual valve are disposed in the synthesis gas output pipeline main path, and the synthesis gas bypass manual valve is located in the synthesis gas output pipeline bypass.
Compared with the prior art, the invention has the beneficial effects that:
1. when the biomass furnace is used, the load of the unit is required to be quickly reduced below a certain load, ash in the hearth of the circulating fluidized bed boiler and the ash in the material returning device are conveyed to the synthesis gas generating furnace, the load reducing speed of the unit is increased, accidents such as pipe explosion and the like caused by over-temperature and over-pressure of a heating surface at the side of the boiler are prevented, on the one hand, part of superheated steam at the tail of the circulating fluidized bed is respectively conveyed into a disturbance air pipeline of the synthesis gas generating furnace and a biomass material dryer through an induced draft fan, the biomass material is dried through the Yu Gaowen high-speed steam, the moisture is reduced to facilitate the pyrolysis of biomass, the disturbance of the biomass material in the generating furnace is enhanced, the pyrolysis rate is increased, and the multi-stage utilization of energy is realized.
2. According to the invention, the output end of the biomass dryer is connected with the biomass inlet end of the synthetic gas generating furnace, and the hot slag output end of the circulating fluidized bed boiler is connected with the hot slag input end of the synthetic gas generating furnace. Ash downcomers around the furnace walls transfer heat to the biomass in the furnace, which gradually begins to carbonize as the temperature increases to produce syngas. The biomass coke falls into a biomass coke collecting box after passing through the fine grate and is stored, and the collected biomass coke can be used as active carbon for removing dioxin in a garbage solid waste power station after being further modified, so that the invention recovers the waste heat of boiler ash and is used for producing biomass synthesis gas, energy is saved, the energy utilization efficiency is improved, and the environment is protected from pollution through the recovery of the biomass coke.
3. When the unit is in fire-lifting and load-lifting, the bed temperature is quickly raised to the coal-feeding temperature by burning inflammable biomass synthetic gas, so that the starting time is saved, the peak regulation of the circulating fluidized bed boiler unit can be realized in a fire-pressing mode, and the unit efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a system for modifying the fire suppression and peak shaving of a circulating fluidized bed boiler;
FIG. 2 is a schematic diagram of a circulating fluidized bed boiler in a modification system for controlling the firing and peak regulation of the circulating fluidized bed boiler according to the present invention;
FIG. 3 is a schematic diagram of a structure of a synthesis gas generating furnace in a reforming system for controlling the firing peak regulation of a circulating fluidized bed boiler according to the present invention;
FIG. 4 is a schematic diagram of a structure of a synthetic gas storage tank in a reforming system for controlling the peak and the pressure of a circulating fluidized bed boiler.
Reference numerals illustrate: 1. a circulating fluidized bed boiler; 2. a synthesis gas generation furnace; 3. a synthesis gas storage tank; 4. a biomass material dryer; 5. an induced draft fan; 6. a synthetic gas ring pipe gas supply manual valve; 7. a synthesis gas peak regulation and gas supply regulating electric valve; 8. a manual valve for ash residue outlet at the rear side of the hearth; 9. a manual valve is bypassed at the ash outlet at the rear side of the hearth; 10. a manual valve at the ash outlet of the returning charge device; 11. a manual valve for a ash outlet bypass of a returning charge device; 12. an ash outlet pipe at the rear side of the hearth; 13. a return ash outlet pipe; 14. a ring-shaped air supply pipe; 15. a wind distribution plate; 16. a coal dropping pipe; 17. bell-type hood; 18. a material returning device; 19. a high temperature steam pipe; 20. an ash drop tube; 21. coarse graticule; 22. fine graticule; 23. a biomass coke collection box; 24. a biomass disturbance wind outlet manual valve; 25. a biomass disturbance wind outlet electric valve; 26. a biomass disturbance wind outlet bypass manual valve; 27. a biomass disturbance wind pipeline; 28. a tank body; 29. a synthesis gas storage pipeline; 30. a hydrophobic conduit; 31. a peak-shaving and air-supplying pipeline for the synthesis gas; 32. a synthesis gas output conduit; 33. a safety valve; 34. a remote pressure gauge; 35. an in situ manometer; 36. a gas tank inlet manual valve; 37. an inlet bypass manual valve; 38. a manual valve in front of the steam trap of the air storage tank; 39. a gas storage tank steam trap; 40. a manual valve behind the steam trap of the air storage tank; 41. a gas holder steam trap bypass manual valve; 42. a peak-shaving air supply valve for the synthesis gas; 43. a manual valve before the synthesis gas is supplied; 44. a synthesis gas supply main valve; 45. a manual valve after the synthesis gas is supplied; 46. a synthesis gas supply bypass manual valve.
Detailed Description
The following describes in detail the embodiments of the present invention with reference to fig. 1 to 4. In the description of the invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Example 1
As shown in fig. 1 to 4, the embodiment of the invention provides a reforming system for a circulating fluidized bed boiler, which comprises a circulating fluidized bed boiler 1, a synthetic gas generating furnace 2, a synthetic gas storage tank 3, a biomass material dryer 4 and an induced draft fan 5, wherein the output end of the synthetic gas generating furnace 2 is connected with the input end of the synthetic gas storage tank 3, the output end of the synthetic gas storage tank 3 is connected with the synthetic gas input end of the circulating fluidized bed boiler 1, the steam output end of the circulating fluidized bed boiler 1 is respectively connected with the steam input end of the material dryer 4 and the steam input end of the synthetic gas generating furnace 2 through the induced draft fan 5, the output end of the biomass material dryer 4 is connected with the biomass material inlet of the synthetic gas generating furnace 2, the synthetic gas generating furnace 2 is used for supplying the circulating fluidized bed boiler 1 with synthetic gas generated by pyrolysis biomass material, the synthetic gas storage tank 3 is used for storing and outputting synthetic gas, and the biomass material dryer 4 is used for drying biomass material.
When the unit receives the AGC command of the power grid, and the load of the unit needs to be quickly reduced below a certain load (hereinafter, 20% is taken as an example), the unit is fired through the circulating fluidized bed boiler unit, and the output of the unit is reduced. At the moment, the ash slag in the hearth and the material returning device of the circulating fluidized bed boiler is reduced, so that the load reducing speed of the unit is increased, the accidents such as pipe explosion and the like caused by over-temperature and over-pressure of a heating surface at the side of the boiler are prevented, on one hand, the superheated steam at the tail part of the circulating fluidized bed is sent into a biomass material dryer, the biomass material is dried by using the Yu Gaowen steam, the moisture is reduced, the pyrolysis of biomass is facilitated, and the multi-stage utilization of energy is realized. When the unit is in fire-lifting and load-lifting, the bed temperature is quickly raised to the coal-feeding temperature by burning inflammable biomass synthetic gas, so that the starting time is saved, and the peak regulation of the circulating fluidized bed boiler unit can be realized in a fire-pressing mode.
Example 2
In this embodiment, on the basis of example 1, as a more preferred embodiment, the bottom of the furnace combustion chamber of the circulating fluidized bed boiler 1 is provided with an air distribution plate 15, four corners of the air distribution plate 15 are provided with synthesis gas injection ports, bell-type hoods 17 are distributed at the positions of the synthesis gas injection ports, the circulating fluidized bed boiler 1 is provided with annular air supply pipelines 14, the annular air supply pipelines 14 are located at the lower side of the air distribution plate 15, the annular air supply pipelines 14 are connected with the synthesis gas input end arranged on the circulating fluidized bed boiler 1, the hot slag output end of the circulating fluidized bed is respectively connected with a furnace rear side slag outlet pipe 12 and a return slag outlet pipe 13, the furnace rear side slag outlet pipe 12 is arranged at the upper side of the air distribution plate 15, the return slag outlet pipe 13 is connected at the bottom of the return slag 18, the tail of the circulating fluidized bed boiler 1 is provided with a high-temperature steam pipe 19, the coal dropping pipe 16 is arranged at the side wall of the circulating fluidized bed boiler 1 and is located above the air distribution plate 15, and the other end of the high-temperature steam pipe 19 is connected with the input end of the material dryer 4 through an induced draft fan 5, and part of the high-temperature steam is used for drying biomass during peak adjustment.
Further, the device also comprises a synthetic gas ring pipe gas supply manual valve 6, a synthetic gas peak regulation gas supply regulating electric valve 7, a hearth rear ash outlet manual valve 8, a hearth rear ash outlet bypass manual valve 9, a returning ash outlet manual valve 10 and a returning ash outlet bypass manual valve 11, wherein the synthetic gas ring pipe gas supply manual valve 6 is arranged on a ring type gas supply pipeline 14, one of four corners of the ring type gas supply pipeline 14 is respectively arranged, the four synthetic gas ring pipe gas supply manual valves 6 are correspondingly connected with synthetic gas injection ports arranged at four corners of a gas distribution plate 15 and are used for balancing and controlling gas supply, the synthetic gas peak regulation gas supply regulating electric valve 7 is positioned at a synthetic gas input end at the bottom of the hearth, the hearth rear ash outlet manual valve 8 and the hearth rear ash outlet bypass manual valve 9 are respectively positioned on a main bypass of a hearth rear ash outlet pipe 12, and the returning ash outlet manual valve 10 and the returning ash outlet bypass manual valve 11 are respectively positioned on a main bypass of the returning ash outlet pipe 12, and one of the four synthetic gas injection ports is opened and the other synthetic gas injection ports are in a standby state during peak regulation.
Specifically, the coal feeding pipe is cut off to feed coal 16, when the oxygen content of the outlet of the hearth is increased by 2%, the boiler fan is completely stopped, the output of the steam turbine generator unit is rapidly reduced to 20% of rated load, but the power generator is always kept from being disconnected, and the steam turbine is not switched off. In the load reduction process, because the heat storage capacity of the circulating fluidized bed boiler is strong, hot ash residues in a hearth and a material returning device still can transfer heat to working media in a water cooling wall, a superheater and a reheater through heat conduction and radiation, so that the load reduction speed of the unit is affected, if the load is reduced rapidly by closing a valve only on the turbine side without considering the boiler side, the overpressure of a heating surface Guan Chaowen on the boiler side exists, and accidents such as safe door action and even pipe explosion can be caused in severe cases. In order to reduce the load rapidly after the fire, a furnace back side ash outlet manual valve 8 and a return ash outlet manual valve 10 are opened, and a furnace back side ash outlet bypass manual valve 9 and a return ash outlet bypass manual valve 11 are used for standby. The hot slag in the hearth and the return device is output into the synthetic gas generating furnace through a hearth rear side slag outlet pipe 12 and a return device slag outlet pipe 13. Steam at the tail part of the circulating fluidized bed boiler passes through Yu Gaowen and is respectively input into a biomass material dryer 4 and a disturbance air pipeline 27 of the synthetic gas generating furnace through a draught fan 5, biomass materials are dried by utilizing the high-speed steam passing through Yu Gaowen, so that the moisture is reduced to facilitate the pyrolysis of biomass, the disturbance of the biomass materials in the generating furnace is enhanced, the pyrolysis rate is improved, and the multi-stage utilization of energy is realized.
Example 3
In this embodiment, on the basis of example 1, as a more preferred embodiment, an ash drop tube 20 is disposed around the outside of the synthesis gas generating furnace 2, the ash drop tube 20 is connected with the hot slag output end of the circulating fluidized bed boiler 1, the ash drop tube 20 is used for transferring the heat of high-temperature ash in the tube to the furnace wall, providing a heat source for the synthesis gas generating furnace 2, a coarse grate 21 is disposed in the synthesis gas generating furnace 2, the coarse grate 21 is used for supporting and uniformly disposing biomass materials thereon, holes below the coarse grate 21 can enable the materials to be fully mixed with disturbance wind, a fine grate 22 is disposed at the bucket-shaped bottom of the synthesis gas generating furnace 2, the fine grate 22 is used for screening biomass coke conforming to particle size, the bottommost part of the synthesis gas generating furnace 2 is connected with a biomass coke collecting box 23, the biomass coke collecting box 23 is used for collecting biomass coke screened by two layers of different thicknesses, and the collected biomass coke can be used as active carbon for removing dioxin in a solid waste power station after further modification.
Further, as shown in fig. 3, in order to fully stir the biomass material to make it heated uniformly, a biomass disturbance air pipeline 24 is disposed below the coarse grate 21, and the biomass disturbance air pipeline 24 is connected with the high-temperature steam pipeline 19 at the tail of the circulating fluidized bed boiler 1 through the induced draft fan 5, and part of the high-speed steam passing through Yu Gaowen is sent to the bottom of the hearth, so that the temperature level of the biomass material is increased, and the biomass material can be fully stirred to make it heated uniformly, and the pyrolysis gas production is easy.
Further, the biomass turbulent air outlet manual valve 24, the biomass turbulent air outlet electric valve 25 and the biomass turbulent air outlet bypass manual valve 26 are further included, the biomass turbulent air outlet manual valve 24 and the biomass turbulent air outlet electric valve 25 are positioned in a main path of the biomass turbulent air pipeline 27, and are normally started to control turbulent air to enter the lower part of the coarse grate 21, so that biomass materials are fully stirred, and all surfaces are heated uniformly; the biomass disturbance wind outlet bypass manual valve 26 is located in the branch of the biomass disturbance wind pipeline 27 and is normally closed for standby.
In the embodiment, the output end of the biomass dryer is connected with the biomass inlet end of the synthetic gas generating furnace, and the hot slag output end of the circulating fluidized bed boiler is connected with the hot slag input end of the synthetic gas generating furnace. Ash downcomers 20 around the furnace wall transfer heat to the biomass in the furnace, which gradually begins to carbonize as the temperature increases. At this time, the biomass disturbance air outlet manual valve 24 and the biomass disturbance air outlet electric valve 25 are opened, the biomass disturbance air outlet bypass manual valve 26 is in a closed standby state, disturbance air continuously enters from the lower side of the coarse grate 21, biomass materials are fully stirred, and all surfaces are heated uniformly to continuously generate synthetic gas. The fine grate 22 adopts a 200-mesh fine screen, biomass coke falls into a biomass coke collecting box 23 after passing through the fine grate 22 and is stored, and the collected biomass coke can be used as activated carbon for removing dioxin in a garbage solid waste power station after being further modified.
The steam input end of the biomass material dryer 4 is connected with a high-temperature steam pipe 19 through an induced draft fan 5 and used for providing a high-temperature heat source, the biomass input end of the biomass material dryer 4 is connected with a biomass pipeline and used for providing biomass materials, the output end of the biomass material dryer 4 is connected with the biomass input end of the synthesis gas generation furnace 2, and wet biomass materials mixed with water are dried in the biomass material dryer 4 through the high-temperature steam transmitted by the induced draft fan 5, and the dried biomass materials are supplied to the synthesis gas generation furnace 2 through the output end of the biomass material dryer 4.
Example 4
In this embodiment, as a more preferable embodiment, as shown in fig. 4, the synthesis gas storage tank 3 includes a tank 28, a synthesis gas storage pipeline 29, a drainage pipeline 30, a synthesis gas peak regulating air supply pipeline 31, a safety valve 33, a remote pressure gauge 34, an on-site pressure gauge 35 and a synthesis gas output pipeline 32, one end of the synthesis gas storage pipeline 29 is connected with the synthesis gas output end of the synthesis gas generating furnace 2, the other end of the synthesis gas storage pipeline 29 is connected with the left side 28 at the bottom of the tank, the drainage pipeline 30 is arranged at the bottom of the tank 28 and is used for discharging water vapor condensed and accumulated at the bottom of the tank, the synthesis gas peak regulating air supply pipeline 31 is arranged at the right side at the bottom of the tank 28 and is used for preventing backflow of bed materials or combustion air (usually lower secondary air) in a circulating fluidized bed hearth under the pressure of the synthesis gas, the on-site pressure gauge 35 is arranged on the side wall of the tank 28 and is convenient for on-site observing the pressure of the gas storage tank, the remote pressure gauge 34 is arranged at the top of the tank and is used for transmitting the pressure to a centralized control chamber in time and grasping the pressure of the gas storage tank, the safety valve 33 is arranged at one side of the tank 28 and is used for preventing the top of the tank from being connected with the side of the top of the tank 32 at the other end of the tank and the side of the tank and is connected with the side of the nozzle 32.
Further, the device also comprises a synthetic gas storage tank inlet manual valve 36, an inlet bypass manual valve 37, a gas storage tank steam trap front manual valve 38, a gas storage tank steam trap 39, a gas storage tank steam trap rear manual valve 40, a gas storage tank steam trap bypass manual valve 41, a synthetic gas peak regulating air supply valve 42, a synthetic gas front manual valve 43, a synthetic gas supply main valve 44, a synthetic gas rear manual valve 45 and a synthetic gas supply bypass manual valve 46, wherein the synthetic gas storage tank inlet manual valve 36 is positioned in a main path of a synthetic gas storage pipeline 29 and is used for controlling the conveying of synthetic gas, the synthetic gas storage tank inlet bypass manual valve 37 is positioned in a bypass of the synthetic gas storage pipeline 29 and is used as a standby valve when the main path of the steam trap front manual valve 38, the gas storage tank steam trap 39 and the gas storage tank steam trap rear manual valve 40 are uniformly distributed in a drain pipeline 30 at the bottom of a tank body 28, the gas storage tank is respectively positioned at the upper, middle and lower positions to prevent longer storage time of the synthetic gas in the gas storage tank, vapor carried by the synthetic gas is condensed and accumulated at the bottom of the tank 28, the gas storage tank steam trap bypass manual valve 41 is positioned at the bypass of the water drain pipeline 30 at the bottom of the tank 28, a large amount of accumulated water is arranged at the bottom of the tank 28 or the tank is opened during overhauling, the synthetic gas peak-shaving air supply valve 42 is arranged on the synthetic gas peak-shaving air supply pipeline 31 to prevent backflow of bed materials or combustion air (usually lower secondary air) in a circulating fluidized bed hearth under the pressure of the synthetic gas, the synthetic gas pre-air supply manual valve 43, the synthetic gas supply total valve 44 and the synthetic gas post-air supply manual valve 45 are arranged on the main path of the synthetic gas output pipeline 32, and the synthetic gas air supply bypass manual valve 46 is positioned at the bypass of the synthetic gas output pipeline 32 and opened when the air quantity is larger.
In this embodiment, the synthesis gas output end of the synthesis gas generating furnace 2 is connected to the input end of the synthesis gas storage tank 3, and the output end of the synthesis gas storage tank 3 is connected to the synthesis gas input end of the circulating fluidized bed boiler 1. The gas storage tank inlet manual valve 36 is opened, the gas storage tank inlet manual valve 37 is in a closed standby state, and the synthetic gas source generated by the synthetic gas generating furnace continuously enters the tank body through the synthetic gas storage pipeline. When the storage time of the synthetic gas in the gas storage tank is long, the vapor carried by the synthetic gas is condensed and accumulated at the bottom of the tank, the condensed vapor is discharged out of the tank body through the control of the valve, and when a large amount of accumulated water exists in the gas storage tank or the tank body is overhauled, the gas storage tank steam trap bypass manual valve 41 is opened. And the on-site pressure gauge of the gas storage tank is started, so that the pressure of the gas storage tank can be conveniently observed on site, the remote transmission pressure gauge of the gas storage tank is started, the pressure is transmitted to the centralized control room, the pressure of the gas storage tank is mastered in time, the safety valve of the gas storage tank is checked at any time, and the over-high pressure of the gas storage tank is prevented. When the power grid needs to quickly start the boiler unit, the fan of the boiler unit is quickly started, the bed materials are fluidized normally, the manual valve 43 before the synthesis gas supply and the manual valve 45 after the synthesis gas supply are manually started at the moment, the synthesis gas supply main valve 44 is slowly opened, the synthesis gas supply bypass manual valve 46 is opened when the gas demand is large, 14 regulating valves are gradually opened according to the change condition of the hearth bed temperature, the synthesis gas peak regulation air supply valve 42 is opened, the pressure of the synthesis gas is ensured to be consistent with or higher than the air pressure of a dense-phase area of the hearth, and the backflow of the bed materials to the synthesis gas supply system is prevented. When the bed temperature rises to 450 ℃ (different coal types and different stable coal feeding temperatures), coal feeding is started through the coal conveying system. When the coal is fed for normal combustion, the load of the boiler unit is adjusted, the temperature and the pressure of the unit are ensured to be normal, the boiler is recovered to be normal, and the unit is normally loaded, so that the full-load adjustment of the unit from low load to 100% rated output force is realized.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations within the scope of the present invention will be apparent to those skilled in the art.
Claims (9)
1. The utility model provides a transformation system of circulating fluidized bed boiler peak regulation of pressing fire, its characterized in that, including circulating fluidized bed boiler (1), synthetic gas generating furnace (2), synthetic gas holder (3), biomass material drying-machine (4) and draught fan (5), the output of synthetic gas generating furnace (2) with the input of synthetic gas holder (3) is connected, the output of synthetic gas holder (3) with the synthetic gas input of circulating fluidized bed boiler (1) is connected, the steam output of circulating fluidized bed boiler (1) respectively with material dryer (4) steam input and synthetic gas generating furnace (2) steam input are connected through draught fan (5), the output of biomass material dryer (4) with the biomass material entry connection of synthetic gas generating furnace (2), synthetic gas generating furnace (2) are used for supplying with through pyrolysis biomass material generating synthetic gas circulating fluidized bed boiler (1), synthetic gas holder (3) are used for storing and outputting synthetic gas, biomass material dryer (4) are used for the biomass material moisture inclusion moisture of biomass material dryer.
2. The reforming system of the circulating fluidized bed boiler fire suppression and peak regulation according to claim 1, wherein an air distribution plate (15) is arranged at the bottom of a hearth combustion chamber of the circulating fluidized bed boiler (1), synthesis gas injection ports are formed in four corners of the air distribution plate (15), bell-type hoods (17) are distributed at the synthesis gas injection ports, an annular air supply pipeline (14) is arranged at the inner side of the bottom of the circulating fluidized bed boiler (1), the annular air supply pipeline (14) is positioned at the lower side of the air distribution plate (15), the annular air supply pipeline (14) is connected with a synthesis gas input end arranged at the bottom of the circulating fluidized bed boiler (1), a hot slag output end of the circulating fluidized bed is respectively connected with a hearth rear ash outlet pipe (12) and a return ash outlet pipe (13), the hearth rear ash outlet pipe (12) is arranged at the upper side of the air distribution plate (15), the return ash outlet pipe (13) is connected to the bottom of a return air (18), a drop pipe (16) is arranged at the side wall of the circulating fluidized bed boiler (1), and the other end of the circulating fluidized bed boiler (1) is connected with a high-temperature steam inlet pipe (19).
3. The reforming system of the circulating fluidized bed boiler fire suppression and peak regulation according to claim 2, further comprising a synthetic gas ring pipe gas supply manual valve (6), a synthetic gas peak regulation gas supply regulation electric valve (7), a furnace rear ash outlet manual valve (8), a furnace rear ash outlet bypass manual valve (9), a material returning device ash outlet manual valve (10) and a material returning device ash outlet bypass manual valve (11), wherein the synthetic gas ring pipe gas supply manual valve (6) is arranged on the annular gas supply pipeline (14), one synthetic gas ring pipe gas supply manual valve (6) is arranged at each corner of the annular gas supply pipeline (14), four synthetic gas ring pipe gas supply manual valves (6) are correspondingly connected with synthetic gas injection ports arranged at four corners of the air distribution plate (15), the synthetic gas peak regulation gas supply regulation electric valve (7) is positioned at a synthetic gas input end at the bottom of the furnace, the furnace rear ash outlet manual valve (8), the furnace rear ash outlet bypass manual valve (9) is respectively positioned on a main ash outlet pipe (12), and the material returning device ash outlet manual valve (10) is respectively positioned on the material returning device ash outlet manual valve (11).
4. The reforming system of the circulating fluidized bed boiler fire suppression and peak regulation according to claim 1, wherein a surrounding ash dropping pipe (20) is arranged on the outer side of a hearth of the synthetic gas generating furnace (2), the ash dropping pipe (20) is connected with a hot slag output end of the circulating fluidized bed boiler (1), a coarse grate (21) is arranged in the synthetic gas generating furnace (2), a fine grate (22) is arranged at the bucket-shaped lower part of the synthetic gas generating furnace (2), and a biomass coke collecting box (23) is connected to the bottommost part of the synthetic gas generating furnace (2).
5. The reforming system for the pressure fire peak regulation of the circulating fluidized bed boiler according to claim 4, wherein a biomass disturbance air pipeline (27) is arranged below the coarse grate (21), the biomass disturbance air pipeline (27) surrounds the outer side of the bucket-shaped bottom of the synthesis gas generating furnace (2), and is connected with the tail high-temperature steam pipe (19) of the circulating fluidized bed boiler through an induced draft fan (5).
6. The reforming system for the fire suppression and peak shaving of the circulating fluidized bed boiler according to claim 5, further comprising a biomass disturbance wind outlet manual valve (24), a biomass disturbance wind outlet electric valve (25) and a biomass disturbance wind outlet bypass manual valve (26), wherein the biomass disturbance wind outlet manual valve (24) and the biomass disturbance wind outlet electric valve (25) are positioned in a main path of the biomass disturbance wind pipeline (27); the biomass disturbance wind outlet bypass manual valve (26) is located on a branch of the biomass disturbance wind pipeline (27).
7. The reforming system for the fire suppression and peak shaving of the circulating fluidized bed boiler according to claim 2, wherein the steam input end of the biomass material dryer (4) is connected with a high-temperature steam pipe (19) at the tail of the circulating fluidized bed boiler (1) through the induced draft fan (5), the biomass input end of the biomass material dryer (4) is connected with a biomass material inlet, and the output end of the biomass material dryer (4) is connected with the biomass input end of the synthesis gas generation furnace (2).
8. The reforming system of the circulating fluidized bed boiler according to claim 1, wherein the synthetic gas storage tank (3) comprises a tank body (28), a synthetic gas storage pipeline (29), a drainage pipeline (30), a synthetic gas peak regulation air supply pipeline (31), a safety valve (33), a remote pressure gauge (34), a local pressure gauge (35) and a synthetic gas output pipeline (32), one end of the synthetic gas storage pipeline (29) is connected with the synthetic gas output end of the synthetic gas generating furnace (2), the other end of the synthetic gas storage pipeline (29) is connected with the left side of the bottom of the tank body (28), the drainage pipeline (30) is arranged at the bottom of the tank body (28), the synthetic gas peak regulation air supply pipeline (31) is arranged on the right side of the bottom of the tank body (28), the air storage tank local pressure gauge (35) is arranged on the side wall of the tank body (28), the remote pressure gauge (34) is arranged at the top of the tank body, the air storage tank safety valve (33) is arranged at the top of the tank body, one side of the tank body (28) is connected with the synthetic gas jet port (32), and the other end of the synthetic gas storage tank (28) is connected with the synthetic gas jet port (1).
9. The reforming system of claim 8, further comprising a gas tank inlet manual valve (36), a gas tank inlet manual valve (37), a gas tank steam trap front manual valve (38), a gas tank steam trap (39), a gas tank steam trap rear manual valve (40), a gas tank steam trap bypass manual valve (41), a synthesis gas peak regulating air supply valve (42), a synthesis gas supply front manual valve (43), a synthesis gas supply total valve (44), a synthesis gas supply rear manual valve (45) and a synthesis gas supply bypass manual valve (46), wherein the gas tank inlet manual valve (36) is located in a main path of the synthesis gas storage pipeline (29), the gas tank inlet manual valve (37) is located in a bypass of the synthesis gas storage pipeline (29), the gas tank steam trap front manual valve (38), the gas tank steam trap (39), the gas tank rear manual valve (40) are all disposed in a main path of the steam trap pipeline (30) at the bottom of the tank body (28), and are located at three positions in the middle and lower, respectively, the gas tank bypass manual valve (36) is located in the synthesis gas supply peak regulating air supply pipeline (30), the synthesis gas bypass manual valve (42) is disposed at the bottom of the synthesis gas supply pipeline (30) The manual valve (45) after the synthesis gas is supplied is arranged on the main path of the synthesis gas output pipeline (32), and the manual valve (46) for the synthesis gas supply bypass is positioned on the bypass of the synthesis gas output pipeline (32).
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