Long-term shutdown maintenance structure of garbage waste heat boiler
By forming an in-furnace circulation pipeline within the boiler, and utilizing a primary air fan and economizer combined with heating devices and nitrogen charging, the problem of rust and corrosion of the boiler heating surfaces after long-term shutdown was solved, achieving the drying and cleaning of the heating surfaces.
Patent Information
- Application Number
- CN202520134097.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-20
AI Technical Summary
In existing technologies, the heating surfaces of waste incineration waste heat boilers are prone to rust and corrosion after long-term shutdown.
By forming an internal circulation pipeline within the boiler, and utilizing a primary air fan and economizer to create internal circulation, combined with heating devices and nitrogen injection, residual water and moisture on the heated surfaces are removed, ensuring dryness.
It effectively removes residual water and moisture from the heating surface, ensuring the boiler's heating surface remains dry and clean, and preventing rust and corrosion.
Smart Images
Figure CN223709699U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a long -term shutdown maintenance structure of garbage waste heat boiler belongs to boiler technical field. BACKGROUND
[0002] A garbage incineration power plant project handles 3000 tons of domestic garbage per day, and four 750 tons per day garbage disposal lines are configured to adopt the forward reciprocating mechanical grate, four natural circulation waste heat boilers with a rated evaporation capacity of 125t / h are configured, and two 65MW medium-temperature sub-high pressure pure condensing turbine generator units are matched. The annual effective working hours of the equipment are not less than 8000 hours.
[0003] The waste heat boiler of the project is a single drum natural circulation boiler arranged indoors. Except the economizer, the waste heat boiler is a suspended structure, three vertical flues, one horizontal flue, the incinerator is a water-cooled structure, the boiler steel frame adopts a welded structure, and the seismic fortification intensity is 7 degrees. The waste heat boiler is arranged with three vertical flues, the first, second and third flues of the boiler are membrane water-cooled wall structures; one horizontal flue, the horizontal flue walls and the top ceiling between the first and second evaporators are membrane water-cooled wall structures, and the ceiling between the first and second evaporators is a superheater membrane tube panel structure. The first, second and third flues of the boiler are radiant heating surfaces, and the horizontal flue is a convection heating surface. The first evaporator, the third superheater, the second superheater, the first superheater three, the first superheater two, the first superheater one, and the second evaporator are arranged in the horizontal flue along the flow direction of the flue gas. Two-stage water spray desuperheaters are arranged between the third superheater, the second superheater and the first superheater to adjust the superheated steam temperature. The economizer is independently arranged in the tail vertical flue and adopts a support structure.
[0004] The garbage incineration waste heat boiler needs to be maintained for a long period of time according to the actual production conditions during the operation time outside the maintenance period, so as to ensure that the heating surface of the shutdown equipment is in good condition and is ready to start switching at any time.
[0005] However, the current heating surface of the shutdown equipment still has some residual water and moisture, and after a long time of shutdown, the heating surface may rust and rot. SUMMARY
[0006] The technical problem to be solved by the utility model is how to remove the residual water and moisture on the heating surface of the shutdown equipment during the long-term shutdown of the boiler, and ensure that the heating surface of the shutdown equipment is dry.
[0007] In order to solve the above technical problems, the technical scheme of the utility model provides a long-term shutdown maintenance structure of waste heat boiler, which comprises a primary air fan and a coal economizer, characterized in that a valve for closing is arranged at the outlet position of the coal economizer, a valve for closing is also arranged in the pipeline in front of the inlet end of the primary air fan, and the inlet end of the primary air fan and the tail flue of the coal economizer are connected through a hot air circulation pipe; after the pipeline in front of the inlet end of the primary air fan and the outlet of the coal economizer are closed, the inlet end of the primary air fan, the tail flue of the coal economizer, the hot air circulation pipe and the cavity where the heat receiving surface of the waste heat boiler is located form the in-furnace circulation pipeline of the in-furnace primary air system.
[0008] Preferably, a heating device is connected to the in-furnace circulation pipeline for heating the circulating gas in the in-furnace circulation pipeline.
[0009] Preferably, the heating device is a primary air steam preheater.
[0010] Preferably, one end of the in-furnace circulation pipeline is connected to a channel for filling nitrogen into the heat receiving surface of the waste heat boiler.
[0011] The structure of the utility model connects the inlet end of the primary air fan to the tail flue of the coal economizer, closes the outlet of the coal economizer, forms the in-furnace circulation of the in-furnace primary air system, blows dry the residual water and moisture of the in-furnace heat receiving surface, and solves the problem of long-term shutdown maintenance of the heat receiving surface of the boiler. In addition, the circulating air is reciprocally heated by the primary air steam preheater, which can better dry the residual water and moisture of the in-furnace heat receiving surface. The channel for filling nitrogen into the heat receiving surface of the waste heat boiler ensures the cleanliness and dryness of the heat receiving surface. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a schematic view (top view) of the long-term shutdown maintenance structure of waste heat boiler.
[0013] Figure 2 It is a schematic view (front view) of the long-term shutdown maintenance structure of waste heat boiler.
[0014] Figure 3 It is a plan view of the long-term shutdown maintenance structure of waste heat boiler. DETAILED DESCRIPTION
[0015] In order to make the utility model more obvious and easy to understand, the preferred embodiments are described in detail below with the help of the drawings.
[0016] The utility model provides a long-term shutdown maintenance structure of waste heat boiler, which comprises a primary air fan and a coal economizer, characterized in that a valve for closing is arranged at the outlet position of the coal economizer, a valve for closing is also arranged in the pipeline in front of the inlet end of the primary air fan, and the inlet end of the primary air fan and the tail flue of the coal economizer are connected through a hot air circulation pipe; after the pipeline in front of the inlet end of the primary air fan and the outlet of the coal economizer are closed, the inlet end of the primary air fan, the tail flue of the coal economizer, the hot air circulation pipe and the cavity where the heat receiving surface of the waste heat boiler is located form the in-furnace circulation pipeline of the in-furnace primary air system. Figure 1 、 Figure 2As shown, it comprises a primary fan 1 and a coal economizer 2, the primary fan 1 import end and the coal economizer 2 tail flue are connected through a hot air circulation pipe 3, a valve for closing is arranged in the pipeline in front of the primary fan 1 import end, so that the pipeline in front of the primary fan 1 import end is separated from the primary fan 1 import end, a valve is arranged at the outlet of the coal economizer 2 for closing, so as to form the furnace circulating pipeline of the furnace primary air system. The furnace circulating pipeline is connected with a primary air steam preheater 4, and a channel for filling nitrogen into the heating surface of the waste heat boiler is connected to one end of the furnace circulating pipeline.
[0017] As shown in the figure, Figure 3 The pipeline between the outlet of the primary air steam preheater 4 in the furnace circulating pipeline and the inlet of the coal economizer 2 is a prior art, the outlet of the primary air steam preheater 4 is sequentially connected with a channel 5, a second channel 6, a third channel 7, and a fourth channel 8, and then connected with the coal economizer 2. Among them, the first, second and third channels 5, 6 and 7 are three vertical flues (i.e. the first, second and third flues of the boiler), and the fourth channel 8 is a horizontal flue in the prior art, and the arrow direction is the gas flow direction. In addition, Figure 3 The left end of the primary fan 1 in the figure is the import end of the primary fan 1, and the import end of the air suction port of the primary fan 1 has been disconnected; Figure 3 The lower end of the coal economizer 2 in the figure is the outlet of the coal economizer 2, and the outlet end of the flue gas of the coal economizer 2 has been disconnected.
[0018] The structure of the utility model uses hot air-nitrogen filling maintenance method to maintain the waste heat boiler which has been stopped for a long time, and the steps are as follows:
[0019] Step one: according to the arrangement of the primary air system of the waste heat boiler, the import end of the primary fan 1 is connected with the tail flue of the coal economizer 2, and after the outlet of the coal economizer 2 is closed, the furnace circulating pipeline of the furnace primary air system is formed, and the circulating air is reciprocally heated by the primary air steam preheater 4, the residual water and moisture in the furnace heating surface are dried, and the temperature in the furnace should be ensured to be about 200 DEG C.
[0020] Step two: the air in the furnace is heated and circulated by adding a hot air circulation pipe 3 to the import end pipeline of the primary fan 1, the outer wall of the heating surface in the furnace is dried, nitrogen is filled into the heating surface of the waste heat boiler by a nitrogen generator on site, and the inside of the heating surface is clean and dry.
[0021] In this embodiment, the primary air steam preheater 4 in the boiler is used as a heating device to heat the furnace circulating pipeline, and other external heating devices can also be used for heating.
Claims
1. A long-term shutdown maintenance structure for a waste heat boiler, comprising a primary air fan (1) and an economizer (2), characterized by, The outlet of the economizer (2) is provided with a valve for closing, and the pipeline in front of the inlet of the primary air fan (1) is also provided with a valve for closing, and the inlet of the primary air fan (1) and the tail flue of the economizer (2) are connected through a hot air circulating pipe (3); after the pipeline in front of the inlet of the primary air fan (1) and the outlet of the economizer (2) are closed, the inlet of the primary air fan (1), the tail flue of the economizer (2), the hot air circulating pipe (3) and the cavity where the heat receiving surface of the waste heat boiler is located form the in-furnace circulating pipeline of the in-furnace primary air system.
2. The long-term shutdown maintenance structure for a waste heat boiler according to claim 1, wherein The in-furnace circulating pipeline is connected with a heating device.
3. A long-term shutdown maintenance structure for a waste heat boiler according to claim 2, characterized in that, The heating device is a primary air steam preheater (4).
4. The long-term shutdown maintenance structure for a waste heat boiler according to claim 1, wherein One end of the in-furnace circulating pipeline is connected with a channel for filling nitrogen into the heat receiving surface of the waste heat boiler.