CN214249550U - Drainage energy-saving optimization device for coal-fired boiler of power station - Google Patents
Drainage energy-saving optimization device for coal-fired boiler of power station Download PDFInfo
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- CN214249550U CN214249550U CN202022852799.0U CN202022852799U CN214249550U CN 214249550 U CN214249550 U CN 214249550U CN 202022852799 U CN202022852799 U CN 202022852799U CN 214249550 U CN214249550 U CN 214249550U
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Abstract
The embodiment of the utility model discloses a drainage energy-saving optimization device for a coal-fired boiler of a power station, which transforms the original two large-flow starting drainage pumps into a large one and a small two parallel-connected water pumps, so that the flow of the drainage pump is reasonably matched with the volume of a drain tank; during the normal operation of the boiler, accumulated water in a drain tank of the boiler can be automatically and periodically discharged through a newly-installed small-flow process heat pump according to the automatic start-stop condition, the discharge time is more than 30 minutes each time, the phenomenon that the accumulated water in the drain tank is instantaneously drained due to overlarge flow of an original starting drainage pump is avoided, meanwhile, a newly-improved small-flow drainage pump inlet pipe is changed into a mode of taking water from a drain tank low-level drainage pipe, the small-flow drainage pump inlet pipe is always kept full of water, and the adverse condition of taking water from original drainage pump liquid is effectively improved; the automatic drainage can be put into the boiler and the in-process is stopped to open, also can manually use large-traffic start-up drain pump, and the flow is big, and the lift is high, can satisfy system operation requirement.
Description
Technical Field
The embodiment of the utility model provides a relate to the power generation technology field, concretely relates to coal fired boiler of power plant drainage is energy-conserving to be optimized device.
Background
The coal-fired power generating unit is a mechanical device for converting chemical energy of fossil fuels such as coal and the like into electric energy. In the prior art, 2 600MW coal-fired steam turbine generator units are installed in the second-stage project of a power plant, a boiler is a direct-current boiler with ultra-supercritical parameter variable-pressure operation, each path of drainage of the boiler is led out of two drainage pipelines and other three main drainage pipes of a boiler body through a water storage tank of a starting separator to enter a flash tank, and is discharged into a boiler drainage tank in a boiler plant through a drainage pipe at the lower part of the flash tank and then is discharged into the boiler drainage tank in the boiler plant through 2 480m steam turbine generator units3And h, starting a draining pump to drain away, and removing the water to a steam condenser or recycling the water to a first-stage chemical sewage condensing tank, as shown in the attached figure 1 of the specification.
Effective volume of flash tank is 90m3The design temperature is 300 ℃, and the effective volume of a boiler drain tank is only 43m3Its internal clear height is 2400mm, which results in a drain tank volume (43 m)3) Flow rate of 2 drainage pumps (480 m)3The utility model discloses a drainage pump, including the drain tank, the drain tank of boiler, the drain tank is equipped with the drain pump, the drain pump is equipped with the drain tank, the drain pump is equipped with the drain pump, the drain tank is equipped with the drain pump, the drain pump is equipped with the drain pump, the drain pump is equipped with the drain. Simultaneously the water supply pipeline is hydrophobic, the coal pulverizer air heater is hydrophobic, the fire control steam is hydrophobic, the heating installation is continuous with the water tank blast pipe before draining, the air heater has simultaneously all the way hydrophobic row to the pit, and pipeline arrangement structure is rigorous inadequately, and the pipeline is more complicated, causes the pipeline to vibrate during unit start-up and operation, brings certain potential safety hazard.
SUMMERY OF THE UTILITY MODEL
Therefore, the embodiment of the utility model provides a power plant coal fired boiler drainage is energy-conserving to optimize device, the effective volume of flash vessel that exists in the coal-fired generating set of solution current, drain box capacity is mismatch seriously with drain pump displacement, the boiler normal operating in-process, the drain pump frequently opens and stops, and operating duration is only a few minutes, operating duration is short excessively, the boiler start-up in-process, the drain pump starts the operation initial stage, the inlet tube is for filling up water completely, the instantaneous vacuum operation of water pump, water pump vibrations are violent, lead to the pump case fracture, the leaky problem of mechanical seal.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: the device comprises a drain tank, a large-flow starting drain pump and a small-flow drain pump, wherein inlet pipelines of the large-flow starting drain pump and the small-flow drain pump are connected to the drain tank, an inlet pipe of the small-flow drain pump takes water from the horizontal position of a drain pipe of the drain tank, an inlet main pipe of the large-flow starting drain pump takes water from the bottom of the drain tank, inlet pipelines of the large-flow starting drain pump and the small-flow drain pump are arranged behind the drain tank of the boiler and a starting discharge valve group, and an outlet pipeline of the large-flow starting drain pump and the small-flow drain pump is connected with a steam condenser or a primary chemical condensate tank.
Further, start emission valve group and include DN400 manual gate valve be connected with the drain trap, DN400 electric gate valve be connected with DN400 manual gate valve and DN100 electric stop valve one be connected with DN400 electric gate valve, the both sides of DN100 electric stop valve one are connected with first three way connection and second three way connection respectively, little discharge pump and first three way connection's branch connection, large-traffic start-up drain pump and second three way connection's branch connection, first three way connection still is connected with DN30 manual stop valve, DN30 manual stop valve's connecting line end buries the ground and wears wall to trench.
Further, the export pipe connection DN80 electric stop valve of little discharge pump, DN80 electric stop valve connect DN80 check valve, the entrance point of reducer is connected to DN80 check valve, the export pipe connection DN250 electric gate valve of large-traffic start discharge pump, DN250 electric gate valve connection DN250 check valve, the exit end of reducer is connected to the exit end of reducer or first phase chemical condensate tank, be provided with DN200 electric stop valve on the exit end of reducer and the connecting pipeline of first phase chemical condensate tank.
Furthermore, the outlet end of the reducer is connected to the inlet end of the drain tank, and a DN100 electric stop valve II is arranged between the outlet end of the reducer and the inlet end of the drain tank.
Furthermore, the water drainage points are arranged at the inlet and outlet of the large-flow starting drainage pump and the small-flow drainage pump close to the pump side.
Further, the volume of the drain tank is 43m3The net height of the interior is 2400mm, and the flow of the large-flow starting drainage pump is 480m3The head is 90m, the rotating speed is 1480r/min, and the flow of the small-flow drainage pump is 60m3H, the lift is 60m, and the rated rotation speed of the pump is 2950 r/min.
Furthermore, a water supply pipeline is drained, an A coal mill air heater is drained, fire steam is drained, a heating water is drained, and the air heater is drained and is connected to a water collecting tank connected with a drain tank main pipe.
The embodiment of the utility model provides a have following advantage:
the embodiment of the utility model provides a power plant coal fired boiler drainage energy-saving optimization device, reform transform former two large-traffic start-up drain pumps into one big one little two water pumps that connect in parallel, make drainage pump flow and drain trap volume rationally match, satisfy boiler start-up and normal operating condition to the demand of displacement; during the normal operation of the boiler, accumulated water gradually accumulated in a boiler drain tank can be automatically and periodically discharged through a newly-installed small-flow process heat pump according to the automatic start-stop condition, the discharge time is more than 30 minutes each time, the phenomenon that the accumulated water in the drain tank is instantaneously drained due to overlarge flow of an original starting drain pump is avoided, meanwhile, a newly-improved small-flow drain pump inlet pipe is changed into the mode that water is taken from a drain pipe at the lower position of the drain tank, the small-flow drain pump inlet pipe is always kept full of water, and the unfavorable condition of taking water from the original drain pump liquid is effectively improved; the automatic drainage can be put into the boiler and the in-process is stopped to open, also can manually use large-traffic start-up drain pump, and the flow is big, and the lift is high, can satisfy system operation requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.
Fig. 1 is a schematic structural view of a drainage energy-saving optimization device of a coal-fired boiler of a power plant provided in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a drainage device of a coal-fired boiler of a power plant before optimization design.
In the figure: the device comprises a drain tank 1, a large-flow starting drain pump 2, a small-flow drain pump 3, a DN400 manual gate valve 4, a DN400 electric gate valve 5, a DN100 electric stop valve I6, a first three-way joint 7, a second three-way joint 8, a DN30 manual stop valve 9, a DN80 electric stop valve 10, a DN80 check valve 11, a large and small head 12, a DN250 electric gate valve 13, a DN250 check valve 14, a DN200 electric stop valve 15 and a DN100 electric stop valve II 16.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment 1 of the utility model provides a coal fired boiler drainage energy-saving optimization device of power plant, as shown in fig. 1, the device includes drain tank 1, large-traffic start-up drain pump 2 and low discharge drain pump 3, the inlet pipeline of large-traffic start-up drain pump 2 and low discharge drain pump 3 all is connected to drain tank 1, the inlet tube of low discharge drain pump 3 is in drain tank 1 drain pipe horizontal position water intaking, the female pipe in the entry of large-traffic start-up drain pump 2 is from drain tank 1 bottom water intaking, the inlet pipeline setting of large-traffic start-up drain pump 2 and low discharge drain pump 3 is behind boiler drain tank 1 to start-up discharge valve group, the outlet pipeline connection steam turbine condenser or the first phase chemical condensation case of large-traffic start-up drain pump 2 and low discharge pump 3.
In this embodiment, the volume of the drain tank 1 is 43m3In, innerThe partial net height is 2400mm, the flow of the large-flow starting drainage pump 2 is 480m3The head is 90m, the rotating speed is 1480r/min, and the flow of the low-flow drainage pump 3 is 60m3H, the lift is 60m, and the rated rotation speed of the pump is 2950 r/min.
One large-flow starting drainage pump is reserved, the other large-flow starting drainage pump and the inlet pipeline of the original # 3 and #4 furnaces are removed, and 1 high-flow starting drainage pump with the flow of 60m is installed3The utility model discloses a water pump, the small flow drain pump of 60m of lift, pump inlet pipeline are behind boiler drain tank 1 to the start-up drain valve group, and the horizontal segment water intaking before the vertical lift, pipeline level arrange insert little drainage pump entry, install the entry electrically operated gate on horizontal pipeline, avoid water intaking problem on the drainage pump liquid, guarantee all the time that little drain pump entry is filled with water, newly install the export electrically operated gate.
Because the two-stage current use starts the drain pump inlet tube and is down "U" shape and arranges, lead to the drain pump inlet tube to exceed 1 horizontal elevation of boiler drain box, appear that the pump inlet tube is water intaking on the liquid, this optimal design reforms transform former large-traffic start-up drain pump 2 into low discharge flow heat pump to outside 1 drain pipe horizontal position water intaking of drain box with its inlet tube, still will remain the high-traffic start-up drain pump 2 entry female pipe from 1 bottom water intaking of drain box.
In this embodiment, start the drain valve group including the DN400 hand gate valve 4 of being connected with the drain tank 1, the DN400 electric gate valve 5 of being connected with DN400 hand gate valve 4 and the DN100 electric stop valve 6 of being connected with DN400 electric gate valve 5, the both sides of DN100 electric stop valve 6 are connected with first three way connection 7 and second three way connection 8 respectively, little discharge pump 3 and the branch connection of first three way connection 7, large-traffic start drain pump 2 and the branch connection of second three way connection 8, first three way connection 7 still is connected with DN30 hand stop valve 9, DN30 hand stop valve 9's connecting line end buries the ground wall-piercing to trench underground.
The outlet pipeline of little flow drain pump 3 connects DN80 electric stop valve 10, DN80 check valve 11 is connected to DN80 electric stop valve 10, the entrance point of reducer 12 is connected to DN80 check valve 11, the outlet pipeline of large-traffic start drain pump 2 connects DN250 electric gate valve 13, DN250 electric gate valve 13 connects DN250 check valve 14, the exit end of reducer 12 is connected to DN250 check valve 14, the steam turbine condenser or the first phase chemical condensation case are connected to the exit end of reducer 12, be provided with DN200 electric stop valve 15 on the exit end of reducer 12 and the connecting pipeline of first phase chemical condensation case. The outlet end of the reducer 12 is connected to the inlet end of the drain tank 1, and a DN100 electric stop valve II 16 is arranged between the outlet end of the reducer 12 and the inlet end of the drain tank 1.
In order to meet the requirement of a draining pump draining primary chemical sewage condensation removing system, an original DN200 manual door for removing the system is transformed into an electric door, and an electric adjusting door is additionally arranged in front of the electric door, so that the pressure and flow of the draining pump can be conveniently adjusted.
And the water drainage points are arranged at the inlet and outlet positions of the large-flow starting water discharge pump 2 and the small-flow water discharge pump 3 close to the pump side. In order to avoid starting the drainage pump and the condition that the equipment is frozen by the accumulated water in the drainage pump in winter, a water drainage point is added at the inlet and outlet of each pump and close to the side of the pump, so that the accumulated water in the pump can be drained completely during the period of stopping the drainage pump.
The principle of the method is that the logic conditions of automatic starting and stopping of 2 draining pumps are redesigned in the thermal engineering, the logic starting and stopping conditions are firstly selected from a small-flow draining pump 3, then a large-flow starting draining pump 2 is adopted, and meanwhile, the interlocking condition that one pump has problems and the other pump is started in a combined mode is designed. According to the clean height 2400mm in the boiler drain box 1 and the effective volume 43m3When the liquid level of the drain tank 1 is designed to be 1600mm, the small-flow drain pump 3 automatically starts draining, the large-flow drain pump 2 stops running and the outlet door is closed (the small-flow pump can automatically start draining only when the outlet door of the large-flow drain pump is in a completely closed state); when the liquid level of the drain tank 1 is designed to be 300mm, the small-flow drain pump 3 automatically stops draining, the draining period is about 23.3m3, the small-flow drain pump 3 runs for about 23 minutes, if some losses are considered, the small pump is estimated to run for about 30 minutes at the longest, and the large-flow start drain pump 2 runs for about 3 minutes, so that the accumulated water in the drain tank 1 is effectively, stably and safely drained during the normal running and starting draining of the boiler.
Reform transform former two large-traffic start-up drain pump 2 into one big one little two parallelly connected water pumps, make drain pump flow and 1 volume rational matching of drain box, and through the thermal technology control according to the high low water level condition of drain box 1, realize that low flow drain pump 3 opens according to 1 liquid level of drain box and stops automatically, and simultaneously, open when opening at the boiler and stop the emission, use the large-traffic start-up drain pump 2 that remains, guarantee under the various operating modes of boiler, start the safe and stable operation of discharge system and satisfy the boiler start-up and the needs of normal operating mode to displacement.
The original starting drainage pump uses 380V cable with rated power of 154.8KW, after transformation, the original big pump 380V cable can be used, but after transformation, the rated power of the small pump is 30KW, the related protection fixed value needs to be verified and modified again by the electric profession, and the working requirement of the low-power drainage pump is met.
Draining five paths: the water supply pipeline is hydrophobic, the coal pulverizer air heater is hydrophobic, the fire steam is hydrophobic, the heating installation is drained water and the air heater is hydrophobic and all is connected to the header tank that links to each other with the 1 mother's pipe of header tank, discharges the atmospheric flash tank earlier, has avoided causing the pipeline to vibrate during unit starts and operation.
The embodiment of the utility model provides a power plant coal fired boiler drainage energy-saving optimization device, reform transform former two large-traffic start-up drain pump 2 into one big one little two water pumps that connect in parallel, make the drainage pump flow rationally match with drain trap volume, satisfy boiler start-up and normal operating condition to the demand of displacement; during the normal operation of the boiler, accumulated water gradually accumulated in a boiler drain tank can be automatically and periodically discharged through a newly-installed small-flow process heat pump according to automatic start-stop conditions, the discharge time is more than 30 minutes each time, the phenomenon that the accumulated water in the drain tank is instantaneously drained due to overlarge flow of an original starting drain pump is avoided, meanwhile, an inlet pipe of a newly-improved small-flow drain pump 3 is changed into water taking from a drain tank low-level drain pipe, the inlet pipe of the small-flow drain pump 3 is always kept full of water, and the unfavorable condition of taking water from original drain pump liquid is effectively improved; in the starting and stopping process of the boiler, automatic drainage can be put into operation, the large-flow starting drainage pump 2 can also be manually used, the flow is large, the lift is high, and the use requirement of the system can be met; after the optimization design, the water supply drainage pipeline, the A coal mill air heater drainage pipeline, the fire steam drainage pipeline, the heating installation drainage pipeline and the air heater drainage pipeline are communicated with the drainage main pipe and are firstly discharged into the atmospheric flash tank, so that pipeline oscillation is avoided during the starting and running periods of the unit.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The device is characterized by comprising a drain tank, a large-flow starting drain pump and a small-flow drain pump, wherein inlet pipelines of the large-flow starting drain pump and the small-flow drain pump are connected to the drain tank, an inlet pipe of the small-flow drain pump takes water from the horizontal position of the drain pipe of the drain tank, an inlet main pipe of the large-flow starting drain pump takes water from the bottom of the drain tank, inlet pipelines of the large-flow starting drain pump and the small-flow drain pump are arranged after the drain tank of the boiler reaches a starting discharge valve group, and outlet pipelines of the large-flow starting drain pump and the small-flow drain pump are connected with a steam condenser or a first-stage chemical condensate tank.
2. The utility model discloses a coal fired boiler of power plant drainage energy-conserving optimizing apparatus of claim 1, characterized in that start-up discharge valve group includes DN400 manual gate valve that is connected with the drain tank, DN400 electric gate valve that is connected with DN400 manual gate valve and DN100 electric stop valve one that is connected with DN400 electric gate valve, the both sides of DN100 electric stop valve one are connected with first three way connection and second three way connection respectively, the branch union coupling of low discharge drain pump and first three way connection, high discharge start-up drain pump and second three way connection's branch connection, first three way connection still is connected with DN30 manual stop valve, the terminal buried wall of wearing to the trench that buries of connecting line of DN30 manual stop valve.
3. The utility model discloses a coal fired boiler of power plant drainage energy-conserving optimizing apparatus of claim 1, characterized in that, the outlet pipe connection DN80 electric stop valve of little discharge pump, DN80 electric stop valve connection DN80 check valve, DN80 check valve connection reducer entrance point, the outlet pipe connection DN250 electric gate valve of large-traffic start-up drainage pump, DN250 electric gate valve connection DN250 check valve, the exit end of reducer is connected to the exit end of reducer, the exit end of reducer is connected steam turbine condenser or first phase chemical condensate tank, be provided with DN200 electric stop valve on the exit end of reducer and the connecting pipeline of first phase chemical condensate tank.
4. The utility coal-fired boiler drainage energy-saving optimization device of claim 3, characterized in that, the exit end of reducer is connected to the entry end of drain tank, is provided with DN100 electronic stop valve two between the exit end of reducer and the entry end of drain tank.
5. The drainage energy-saving optimization device for the coal-fired boiler of the power plant as claimed in claim 1, wherein drainage points are arranged at the inlet and outlet of the high-flow starting drainage pump and the low-flow drainage pump close to the pump side.
6. The utility coal-fired boiler drainage energy-saving optimization device of claim 1, characterized in that the volume of the drainage tank is 43m3The net height of the interior is 2400mm, and the flow of the large-flow starting drainage pump is 480m3The head is 90m, the rotating speed is 1480r/min, and the flow of the small-flow drainage pump is 60m3H, the lift is 60m, and the rated rotation speed of the pump is 2950 r/min.
7. The drainage energy-saving optimization device for the coal-fired boiler of the power plant as claimed in claim 1, wherein a water supply pipeline is drained, and a coal mill air heater drain, a fire steam drain, a heating water drain and an air heater drain are connected to a water collection tank connected with a main pipe of the water collection tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022852799.0U CN214249550U (en) | 2020-12-02 | 2020-12-02 | Drainage energy-saving optimization device for coal-fired boiler of power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022852799.0U CN214249550U (en) | 2020-12-02 | 2020-12-02 | Drainage energy-saving optimization device for coal-fired boiler of power station |
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| Publication Number | Publication Date |
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| CN214249550U true CN214249550U (en) | 2021-09-21 |
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| CN202022852799.0U Active CN214249550U (en) | 2020-12-02 | 2020-12-02 | Drainage energy-saving optimization device for coal-fired boiler of power station |
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| CN (1) | CN214249550U (en) |
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- 2020-12-02 CN CN202022852799.0U patent/CN214249550U/en active Active
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