CN210833222U - Boiler steam oxygenation decompression blowpipe system - Google Patents
Boiler steam oxygenation decompression blowpipe system Download PDFInfo
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- CN210833222U CN210833222U CN201921724688.2U CN201921724688U CN210833222U CN 210833222 U CN210833222 U CN 210833222U CN 201921724688 U CN201921724688 U CN 201921724688U CN 210833222 U CN210833222 U CN 210833222U
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Abstract
The utility model provides a boiler steam oxygenation decompression blowpipe system, including superheater group and reheater group, connect the oxygenation pipeline one on the entry header pipe of the ceiling superheater of superheater group, connect the oxygenation pipeline two on the export header connecting pipe of the vertical low temperature superheater, connect the oxygenation pipeline three on the export header connecting pipe of the screen superheater, the oxygenation pipeline one, the oxygenation pipeline two and the oxygenation pipeline three-way first oxygenation mother pipe connect the first oxygen storage device; and an inlet header tank nitrogen filling interface of a low-temperature reheater of the reheater group is connected with an oxygen adding pipeline IV, an inlet header tank of the high-temperature reheater is connected with an oxygen adding pipeline V, and the oxygen adding pipeline IV and the oxygen adding pipeline V are connected with a second oxygen storage device through a second oxygen adding main pipe. The utility model discloses a rationally select interim oxygenation system pipeline and boiler heating surface tie point for the boiler respectively receives heating surface and steam conduit inner wall metal surface to form fine and close protection film, and the blowpipe number of times is few, and the cost time is short, saves boiler chemical cleaning process, reduce cost.
Description
Technical Field
The utility model belongs to the technical field of boiler pipeline steam blasts, concretely relates to boiler steam adds oxygen step-down blowpipe system.
Background
The steam purging of the boiler pipeline is an important project for the basic building and debugging of the unit, and aims to apply the kinetic energy generated by steam to remove residual sundries and rust matters in the transportation, storage and installation of a superheater system, a reheater system and a steam pipeline so as to ensure the safe and economic operation of the boiler unit. At present, boiler steam blowpipes are generally two methods, namely a pressure reduction steam blowpipe and a pressure stabilization steam blowpipe.
The pressure reduction blowpipe indicates that the blow door that faces at the boiler is in the closed condition, and when boiler superheater outlet pressure reached the pressure value in the blowpipe scheme, open and face the blow door, utilize a large amount of steam that the in-process boiler heat accumulation flash distillation of step-down produced, short time high velocity of flow erodees pipelines such as superheater, reheater, main steam pipeline to and the inside impurity of clean up pipeline. The steady voltage blowpipe is gone on under the unchangeable condition of boiler superheater steam temperature and steam pressure, faces the blow door and keeps opening fully or open to the intermediate position, utilizes the steam that the boiler drum produced in succession to wash over heater, re-heater, steam conduit inner wall to accomplish boiler blowpipe work, face the blow door and open the in-process, debugging personnel need control fuel volume and steam volume keep balanced, and steam sweeps a period of time after, reduces the fuel volume gradually, closes and faces the blow door.
However, the two blowpipe methods described above have the following drawbacks: (1) the method adopts a pressure reduction blowing pipe mode, the blowing times are more, the blowing time is long, and simultaneously, the pressure and the temperature born by the heating surface of the boiler and a steam pipeline are changed rapidly during each blowing, so that the service life of the boiler is influenced; (2) the pressure stabilizing blow pipe mode is adopted, a large amount of fuel is consumed, a large amount of demineralized water needs to be supplemented, the operation is complex, the steam pressure and the temperature at the outlet of the superheater are maintained to be stable, and the control is difficult.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the problems that the number of times of the blowpipes is large, the blowpipe time is long, and the consumption of the fuel quantity and the desalted water quantity is large in the pressure reduction blowpipes and the pressure stabilization blowpipes of the prior boiler.
Therefore, the utility model provides a boiler steam adds oxygen step-down blowpipe system, including superheater group and reheater group, superheater group includes ceiling over heater, perpendicular low temperature over heater and platen over heater, connect the oxygenation pipeline one between the primary valve that the blow-down pipe of the entry header pipeline of ceiling over heater corresponds and the secondary valve, connect the oxygenation pipeline two between the primary valve that the export header of perpendicular low temperature over heater corresponds with the blow-down pipe of the entry header connecting pipe of platen over heater and the secondary valve, connect the oxygenation pipeline three on the export header connecting pipe of platen over heater, connect first oxygen storage device through first oxygenation mother pipe after oxygenation pipeline one, oxygenation pipeline two and oxygenation pipeline three are parallelly connected; the reheating unit group comprises a low-temperature reheater and a high-temperature reheater, an inlet header tank of the low-temperature reheater is connected with a nitrogen filling connector to form a fourth oxygen filling pipeline, an inlet header tank of the high-temperature reheater is connected with a fifth oxygen filling pipeline, and the fourth oxygen filling pipeline and the fifth oxygen filling pipeline are connected in parallel and then connected with a second oxygen storage device through a second oxygen filling main pipe.
Furthermore, the first oxygen adding main pipe and the second oxygen adding main pipe are both provided with a regulating valve for regulating the oxygen adding amount of the boiler.
Furthermore, the tail ends of the first oxygenation mother pipe and the second oxygenation mother pipe in the gas running direction are provided with check valves.
Further, the first oxygenation mother pipe and the second oxygenation mother pipe both adopt phi 28 copper pipes, and the first oxygenation pipeline, the second oxygenation pipeline, the third oxygenation pipeline, the fourth oxygenation pipeline and the fifth oxygenation pipeline all adopt phi 16 alloy steel.
Furthermore, the first oxygen storage device and the second oxygen storage device are a plurality of oxygen cylinders which are arranged in parallel.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a this kind of boiler steam adds oxygen step-down blowpipe system is through the superheater group and the reheater group heating surface tie point of the interim oxygen system pipeline of rational selection and boiler, install interim oxygen system, make the boiler respectively receive the heating surface and the fine and close protection film of steam conduit inner wall metal surface formation, thereby can prevent effectively that the pipeline inner wall from corroding, solve the defect that boiler step-down blowpipe and steady voltage blowpipe exist, the blowpipe number of times is few, the cost time is short, and the operation is simple and convenient, the fuel amount and the demineralized water volume that consume during the greatly reduced blowpipe, reduce boiler component metal thermal stress influence, save boiler chemical cleaning process, and the cost is reduced.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of a temporary oxygen supply system installed on a superheater group of a boiler according to the present invention;
FIG. 2 is a schematic structural view of a temporary oxygen adding system installed on a reheater group of a medium boiler in the present invention.
Description of reference numerals: 1. a first oxygen storage device; 2. a first oxygenation mother pipe; 3. adjusting a valve; 4. a check valve; 5. an oxygen adding pipeline I; 6. an oxygen adding pipeline III; 7. a second oxygen adding pipeline; 8. a ceiling superheater; 9. a platen superheater; 10. a vertical low temperature superheater; 11. a second oxygen storage device; 12. a second oxygenation main pipe; 13. an oxygen adding pipeline IV; 14. an oxygen adding pipeline V; 15. a low temperature reheater; 16. a high temperature reheater.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" or "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 and fig. 2, the present embodiment provides a boiler steam oxygenation and depressurization blow pipe system, which includes a superheater group and a reheater group, where the superheater group includes a ceiling superheater 8, a vertical low-temperature superheater 10, and a platen superheater 9, an oxygenation pipeline i 5 is connected between a primary valve and a secondary valve corresponding to a vent pipe of an inlet header pipeline of the ceiling superheater 8, an oxygenation pipeline ii 7 is connected between a primary valve and a secondary valve corresponding to a vent pipe of an outlet header of the vertical low-temperature superheater 10 and an inlet header connecting pipe of the platen superheater, an oxygenation pipeline iii 6 is connected to an outlet header connecting pipe of the platen superheater 9, and the oxygenation pipeline i 5, the oxygenation pipeline ii 7, and the oxygenation pipeline iii 6 are connected in parallel and then connected to a first oxygen storage device 1 through a first oxygenation header pipe 2; the reheater group includes low temperature reheater 15 and high temperature reheater 16, four 13 oxygenation pipelines are connected at the nitrogen interface department to the entry header of low temperature reheater 15, connect five 14 oxygenation pipelines on the entry header of high temperature reheater 16, connect second oxygen storage device 11 through second oxygenation mother pipe 12 after four 13 oxygenation pipelines and five 14 oxygenation pipelines connect in parallel. Specifically, the first oxygenation mother pipe 2 and the second oxygenation mother pipe 12 both adopt phi 28 copper pipes, and the first oxygenation pipeline 5, the second oxygenation pipeline 7, the third oxygenation pipeline 6, the fourth oxygenation pipeline 13 and the fifth oxygenation pipeline 14 all adopt phi 16 alloy steel. The first oxygen storage device 1 and the second oxygen storage device 11 are a plurality of oxygen cylinders which are arranged in parallel. The installation positions and connection modes of the superheaters and the reheaters of the superheater bank and the reheater bank of the boiler in the boiler system in the embodiment are the prior art, and are not described herein again.
In the embodiment, the temporary oxygenation system (namely the first oxygenation pipeline 5, the second oxygenation pipeline 7, the third oxygenation pipeline 6, the fourth oxygenation pipeline 13, the fifth oxygenation pipeline 14, the first oxygenation mother pipe 2, the second oxygenation mother pipe 12, the first oxygen storage device 1 and the second oxygen storage device 11) is installed by reasonably selecting the connecting points of the temporary oxygenation system pipeline and the heating surfaces of the superheater group and the reheater group of the boiler, and as the general deposits in the newly-built boiler element pipes mainly consist of low-valence iron oxide components and have poor stability, the deposits can be oxidized into high-valence iron oxide by oxygen when the environmental temperature reaches a certain temperature during the blowpipe period, the sturdiness structure of the deposits is damaged, and the metal on the inner wall of the boiler pipe from which the deposits are removed forms a high-strength corrosion-resistant protective film under the high-temperature catalytic oxidation of an oxidant, so that the corrosion of the inner wall of the pipeline can be effectively prevented, and the defects existing in a pressure, the method has the advantages of less times of blowing pipes, short time consumption, simple and convenient operation, greatly reduced fuel consumption and desalted water consumption during blowing pipes, reduced metal thermal stress influence of boiler elements, saved chemical cleaning procedures of the boiler and reduced cost.
In a refined implementation mode, the first oxygenation main pipe 2 and the second oxygenation main pipe 12 are both provided with a regulating valve 3 for regulating boiler oxygenation concentration, during a blowing pipe, the regulating valve 3 should be opened slowly and control the temperature of boiler steam, the temperature of the boiler steam must be proper, the temperature is too low, the function of the oxygenation blowing pipe cannot be achieved, the temperature is too high, a metal protective film on the inner wall of a furnace tube is loose and cracks, and the temperature of the boiler steam in the embodiment is 350-550 ℃. Meanwhile, the tail ends of the first oxygenation main pipe 2 and the second oxygenation main pipe 12 in the gas running direction are provided with check valves 4, and therefore the boiler steam is prevented from flowing backwards. Preferably, in this embodiment, needle valves are used for the regulating valve 3 and the check valve 4 of the oxygen feeding main pipe, so as to control the oxygen feeding amount of each purging.
The specific process of blowing the pipe by adopting the boiler steam oxygenation depressurization blowing pipe system is as follows:
(1) and installing a temporary oxygenation system according to the boiler steam oxygenation depressurization blowing pipe system, wherein the temporary oxygenation system comprises a first oxygenation pipeline 5, a second oxygenation pipeline 7, a third oxygenation pipeline 6, a fourth oxygenation pipeline 13, a fifth oxygenation pipeline 14, a first oxygenation mother pipe 2, a second oxygenation mother pipe 12, a first oxygen storage device 1 and a second oxygen storage device 11.
For preventing oil accumulation in the oxygenation pipeline, oxygenation is carried outExplosion accidents occur during the period of the pressure reduction blowpipe, and CCl is applied before all valves and pipelines of the temporary oxygenation system are installed4Thorough cleaning is carried out, and after degreasing, whether the degreasing is qualified or not is checked by using an ultraviolet ray inspection method or a solvent analysis method. The pipeline and the valve after qualified degreasing are required to be closed in time, and the valve is sealed; meanwhile, all welded junctions of the temporary oxygenation system pipeline are subjected to bottom welding by argon arc welding and pass 100% nondestructive inspection.
(2) And (4) closing the temporary oxygenation system, performing trial blowing pipes on a superheater group and a reheater group of the boiler, and checking the tightness of the system.
The pipeline of the temporary oxygenation system needs to be subjected to a hydrostatic test, and the test standard is 1.25 times of working pressure; the specific operation process of the hydraulic test is the prior art, and is not described herein again.
(3) Starting a temporary oxygenation system, blowing pipes on a superheater group and a reheater group of a boiler by using boiler steam with oxygen so as to form a protective film on the inner metal surfaces of the superheater group and the reheater group; wherein, open the interim oxygenation system and begin to add oxygen when opening the blowing door, close interim oxygenation system and stop adding oxygen when preparing to close the blowing door, and the temperature of boiler steam is 350 ~ 550 ℃.
The general deposit in the newly-built boiler element pipe mainly comprises low-valence iron oxide components, has poor stability, can be oxidized into high-valence iron oxide by oxygen when the ambient temperature reaches a certain temperature, destroys the sturdy structure of the deposit, and is easy to remove when steam with certain pressure and temperature scours the inner wall of the pipe at a high speed. The specific chemical reaction equation is as follows:
4FeO+O2=2Fe2O3
6FeO+O2=2Fe3O4
6Fe(OH)2+O2=2Fe3O4+6H2O。
the metal on the inner wall of the furnace tube from which the sediment is removed forms a high-strength corrosion-resistant protective film under the high-temperature catalytic oxidation of an oxidant. The chemical reaction equation is as follows:
4Fe+3O2=2Fe2O3
3Fe+2O2=2Fe3O4。
during the blowing period, the oxygen pressure of the oxygen blowing pipe of the superheater group is 6-7 MPa, and the oxygen pressure of the oxygen blowing pipe of the reheater group is 4-5 MPa. Meanwhile, the thickness of the protective film on the metal inner wall of the boiler element is detected through a copper sulfate drop test, and the components of a copper sulfate solution are as follows: 40mL of 0.4mol/L CuSO4 solution, 20mL of 10% NaCl solution and 15mL of 0.1mol/LHCl solution; CuSO4The drop test is applied to low alloy steel, the corrosion resistance is over 12 minutes, the corrosion resistance can be over 120 minutes for high alloy steel, and the thickness of the protective film is 2-15 mu m.
In addition, in the process of oxygen addition, attention needs to be paid to the wall temperature of components such as a vertical low-temperature superheater, a horizontal low-temperature superheater, a platen superheater, a reheater and the like of the boiler, and when the temperature of the tube wall is over-high, an oxide film on the inner wall of the tube is not dense, so that the protection effect is not achieved.
The above illustration is merely an illustration of the present invention, and does not limit the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (5)
1. The utility model provides a boiler steam adds oxygen step-down blowpipe system, includes superheater group and reheat group, its characterized in that: the superheater group comprises a ceiling superheater, a vertical low-temperature superheater and a screen superheater, wherein an oxygen adding pipeline I is connected between a primary valve and a secondary valve which correspond to an emptying pipe of an inlet header pipeline of the ceiling superheater, an oxygen adding pipeline II is connected between a primary valve and a secondary valve which correspond to an air discharge pipe of an outlet header of the vertical low-temperature superheater and an inlet header connecting pipe of the screen superheater, an oxygen adding pipeline III is connected to an outlet header connecting pipe of the screen superheater, and the oxygen adding pipeline I, the oxygen adding pipeline II and the oxygen adding pipeline III are connected in parallel and then connected with a first oxygen storage device through a first oxygen adding main pipe; the reheating unit group comprises a low-temperature reheater and a high-temperature reheater, an inlet header tank of the low-temperature reheater is connected with a nitrogen filling connector to form a fourth oxygen filling pipeline, an inlet header tank of the high-temperature reheater is connected with a fifth oxygen filling pipeline, and the fourth oxygen filling pipeline and the fifth oxygen filling pipeline are connected in parallel and then connected with a second oxygen storage device through a second oxygen filling main pipe.
2. The boiler steam oxygenation depressurization blowpipe system of claim 1, wherein: and the first oxygen adding main pipe and the second oxygen adding main pipe are both provided with a regulating valve for regulating the oxygen adding amount of the boiler.
3. The boiler steam oxygenation depressurization blowpipe system of claim 1, wherein: and the tail ends of the first oxygenation main pipe and the second oxygenation main pipe in the gas running direction are both provided with check valves.
4. The boiler steam oxygenation depressurization blowpipe system of claim 1, wherein: the first oxygenation mother pipe and the second oxygenation mother pipe both adopt phi 28 copper pipes, and the first oxygenation pipeline, the second oxygenation pipeline, the third oxygenation pipeline, the fourth oxygenation pipeline and the fifth oxygenation pipeline all adopt phi 16 alloy steel.
5. The boiler steam oxygenation depressurization blowpipe system of claim 1, wherein: the first oxygen storage device and the second oxygen storage device are a plurality of oxygen cylinders which are arranged in parallel.
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| CN201921724688.2U CN210833222U (en) | 2019-10-15 | 2019-10-15 | Boiler steam oxygenation decompression blowpipe system |
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| CN110608633A (en) * | 2019-10-15 | 2019-12-24 | 中冶南方都市环保工程技术股份有限公司 | Boiler steam oxygenation depressurization blowing pipe system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110608633A (en) * | 2019-10-15 | 2019-12-24 | 中冶南方都市环保工程技术股份有限公司 | Boiler steam oxygenation depressurization blowing pipe system and method |
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