Water feeding structure of generator boiler
By renovating the boiler water supply pipeline and directly using the condensate pump to directly feed the boiler, the problem of lack of electric water supply pumps when boiling the boiler of large thermal power units is solved, and the effect of reducing plant electricity consumption and improving water supply flexibility is achieved.
Patent Information
- Application Number
- CN202420985068.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-09
AI Technical Summary
When large thermal power units frequently start and stop peaks, the lack of electric water supply pumps causes the boiler to start the steam water supply pump and related systems when the boiler is loaded, which increases the plant's electricity consumption, operating time and is affected by the deaerator.
By renovating the low-add outlet pipeline and the front pump inlet pipeline, the condensate pipe at the condensate pump outlet is directly connected to the water supply pipeline, and bypassing the deaerator. When the boiler needs water supply, you only need to start the condensate pump to directly feed the boiler.
It reduces factory electricity consumption, shortens boiler water supply time, reduces the workload of operating personnel, and improves the flexibility of boiler water supply.
Smart Images
Figure CN222669970U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of generator structures, and in particular relates to a water supply structure for a generator boiler. Background Art
[0002] Large thermal power units are usually not equipped with electric feedwater pumps, and the pre-pump and steam-driven feedwater pump are arranged coaxially. This configuration system is relatively simple, the unit design power consumption rate is lower, and the switching operation of the electric feedwater pump and the steam-driven feedwater pump is not required when the unit is started, and the workload of the operating personnel is relatively small. However, under the current power market situation, the unit needs to be started and stopped frequently for peak load regulation, that is, the boiler is filled with water many times. Since there is no electric feedwater pump and the pre-pump is coaxial with the steam-driven feedwater pump, the feedwater pump turbine must be operated to provide sufficient head to fill the boiler with water. In order to meet the operating needs of the steam-driven feedwater pump unit, the operating personnel have to start the circulating water system, closed water system, shaft seal system, vacuum pump system, auxiliary steam system, lubricating oil system, etc. in advance. This has three problems: first, the power consumption of the plant is large; second, the water filling operation is large and takes a long time; third, when the unit is overhauled, if a certain associated system (deaerator) does not meet the starting conditions, the progress of boiler filling will be affected, which will in turn affect the subsequent work of the unit maintenance. Utility Model Content
[0003] In view of the technical problems of existing boiler water supply, such as large electricity consumption, long time and limitation of deaerator, the utility model provides a generator boiler water supply structure, which can directly supply water to the boiler through a condensate pump, avoids starting the steam-driven water supply pump and related matching systems (equipment), reduces plant electricity consumption, reduces the workload of operating personnel, and improves the flexibility of boiler water supply.
[0004] The utility model provides a water supply structure for a generator boiler, comprising a condenser, a condensate pipeline, a condensate pump, a low-pressure heater, a low-pressure heater outlet pipeline, a connecting pipe, a deaerator, a first pre-pump inlet pipeline, a high-pressure heater, a high-pressure heater outlet pipeline and a boiler economizer, wherein the condensate pipeline is respectively connected to the condenser and the low-pressure heater, the condensate pump is arranged on the condensate pipeline, the low-pressure heater outlet pipeline is respectively connected to the low-pressure heater and the deaerator, a fifth valve is arranged on the low-pressure heater outlet pipeline, the first pre-pump inlet pipeline is respectively connected to the deaerator and the high-pressure heater, the high-pressure heater outlet pipeline is respectively connected to the high-pressure heater and the boiler economizer, a second valve, a first pre-pump and a first steam-driven feedwater pump are sequentially arranged on the first pre-pump inlet pipeline, one end of the connecting pipe is connected between the fifth valve and the low-pressure heater on the low-pressure heater outlet pipeline, the other end of the connecting pipe is connected between the second valve and the first pre-pump on the first pre-pump inlet pipeline, and a third valve is arranged on the connecting pipe.
[0005] Furthermore, a fourth valve is provided on the connecting pipe.
[0006] Furthermore, the generator boiler water supply structure also includes a second pre-pump inlet pipeline, the first pre-pump inlet pipeline and the second pre-pump inlet pipeline are connected in parallel between the deaerator and the high-pressure heater, and the second pre-pump inlet pipeline is sequentially provided with a first valve, a second pre-pump and a second steam-driven feed water pump.
[0007] The boiler water supply structure of this generator is designed to be equipped with no electric feed water pump and the pre-pump is coaxially arranged with the steam-driven feed water pump. The low-pressure heater outlet pipeline and the pre-pump inlet pipeline are modified. A line is led out from the low-pressure heater outlet pipeline and directly connected to the pre-pump inlet pipeline. The advantage of this modification is that the condensate pipeline at the condensate pump outlet is directly connected to the unit feed water pipeline, bypassing the unit deaerator. When the boiler needs to be filled with water, it is no longer necessary to start the steam-driven feed water pump and related matching systems (equipment). Only the condensate pump needs to be started to directly fill the boiler with water, which shortens the filling time, reduces the power consumption of the plant, and improves the flexibility of boiler filling. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0009] Figure 1 The figure is a schematic diagram of the structure of a water supply structure for a generator boiler. DETAILED DESCRIPTION
[0010] The utility model discloses a generator boiler water supply structure, which can directly supply water to the boiler through a condensate pump, avoids starting a steam-driven water supply pump and related matching systems (equipment), reduces plant electricity consumption, alleviates the workload of operating personnel, and improves the flexibility of boiler water supply.
[0011] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution in the utility model. Obviously, what is described is only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0012] See also Figure 1As shown, the utility model discloses a water supply structure for a generator boiler, comprising a condenser 19, a condensate pipeline 17, a condensate pump 18, a low-pressure heater 16, a low-pressure heater outlet pipeline 14, a connecting pipe 9, a deaerator 4, an inlet pipeline 20 of a first pre-pump 12, a high-pressure heater 3, a high-pressure heater outlet pipeline 2 and a boiler economizer 1, wherein the condensate pipeline 17 is respectively connected to the condenser 19 and the low-pressure heater 16, the condensate pump 18 is arranged on the condensate pipeline 17, the low-pressure heater outlet pipeline 14 is respectively connected to the low-pressure heater 16 and the deaerator 4, the low-pressure heater outlet pipeline 14 is provided with a fifth valve 15, the first valve 20 is arranged on the low-pressure heater outlet pipeline 14, and the first valve 20 is arranged on the low-pressure heater outlet pipeline 14. An inlet pipeline 20 of a pre-pump 12 is respectively connected to the deaerator 4 and the high-pressure heater 3, and the high-pressure heater outlet pipeline 2 is respectively connected to the high-pressure heater 3 and the boiler economizer 1. The second valve 8, the first pre-pump 12 and the first steam-driven feedwater pump 13 are sequentially arranged on the inlet pipeline 20 of the first pre-pump 12. One end of the connecting pipe 9 is connected between the fifth valve 15 and the low-pressure heater 16 on the low-pressure heater outlet pipeline 14, and the other end of the connecting pipe 9 is connected between the second valve 8 and the first pre-pump 12 on the inlet pipeline 20 of the first pre-pump 12. The connecting pipe 9 is provided with a third valve 11.
[0013] The connecting pipe 9 is also provided with a fourth valve 10 .
[0014] The generator boiler water supply structure also includes a second pre-pump 6 inlet pipeline 21, the first pre-pump 12 inlet pipeline 20 and the second pre-pump 6 inlet pipeline 21 are connected in parallel between the deaerator 4 and the high-pressure heater 3, and the second pre-pump 6 inlet pipeline 21 is sequentially provided with a first valve 5, a second pre-pump 6 and a second steam-driven feed water pump 7.
[0015] The first valve 5 and the second valve 8 are mainly used to close, isolate and cut off the medium flow between the deaerator 4 and the first pre-pump 12 and the second pre-pump 6. When the unit is running, the first valve 5 and the second valve 8 are open. When the first pre-pump 12 and the second pre-pump 6 need to be repaired, the first valve 5 and the second valve 8 need to be closed.
[0016] The function of the fifth valve 15 is to close and isolate the medium flow between the low-pressure heater 16 and the deaerator 4. When the unit is operating normally, the fifth valve 15 is open. When the deaerator 4 needs to be repaired, the first valve 5, the second valve 8, and the fifth valve 15 need to be closed.
[0017] The third valve 11 and the fourth valve 10 are used to open the medium flow between the low-pressure heater 16 and the first pre-pump 12, bypassing the deaerator 4. When the unit is operating normally, the third valve 11 and the fourth valve 10 are closed; when the boiler needs water supply, the third valve 11 and the fourth valve 10 are opened.
[0018] The function of the connecting pipe 9 is to bypass the deaerator 4 during the unit startup phase and directly supply water to the boiler through the condensate pump 18 when the utility model is put into operation, without the need to start the steam-driven feed water pump and related matching systems (equipment).
[0019] Operation process:
[0020] During the start-up phase of the unit, when the boiler needs to be filled with water, confirm that the first valve 5, the second valve 8, and the fifth valve 15 are all closed, slowly open the third valve 11 and the fourth valve 10, and start the condensate pump 18. At this time, the condensate enters the inlet of the first pre-pump 12 through the connecting pipe 9, and then passes through the first steam-driven feed water pump 13 and the high-pressure heater 3 in succession, and finally enters the boiler until the boiler is filled with water. Stop the condensate pump 18, close the third valve 11 and the fourth valve 10, open the first valve 5, the second valve 8, and the fifth valve 15, and restore the system to its original state.
[0021] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A water supply structure for a generator boiler, characterized in that: The utility model comprises a condenser, a condensate pipeline, a condensate pump, a low-pressure heater, a low-pressure heater outlet pipeline, a connecting pipe, a deaerator, a first pre-pump inlet pipeline, a high-pressure heater, a high-pressure heater outlet pipeline and a boiler economizer. The condensate pipeline is respectively connected to the condenser and the low-pressure heater. The condensate pump is arranged on the condensate pipeline. The low-pressure heater outlet pipeline is respectively connected to the low-pressure heater and the deaerator. A fifth valve is arranged on the low-pressure heater outlet pipeline. The first pre-pump inlet pipeline is respectively connected to the deaerator and the high-pressure heater. The high-pressure heater outlet pipeline is respectively connected to the high-pressure heater and the boiler economizer. A second valve, a first pre-pump and a first steam-driven feedwater pump are arranged on the first pre-pump inlet pipeline in sequence. One end of the connecting pipe is connected between the fifth valve and the low-pressure heater on the low-pressure heater outlet pipeline. The other end of the connecting pipe is connected between the second valve and the first pre-pump on the first pre-pump inlet pipeline. A third valve is arranged on the connecting pipe.
2. A generator boiler water supply structure according to claim 1, characterized in that: The connecting pipe is also provided with a fourth valve.
3. A generator boiler water supply structure according to claim 1, characterized in that: The generator boiler water supply structure also includes a second pre-pump inlet pipeline. The first pre-pump inlet pipeline and the second pre-pump inlet pipeline are connected in parallel between the deaerator and the high-pressure heater. The second pre-pump inlet pipeline is sequentially provided with a first valve, a second pre-pump and a second steam-driven feed water pump.