CN218763313U - Reheating and temperature reducing water system of power station boiler - Google Patents
Reheating and temperature reducing water system of power station boiler Download PDFInfo
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- CN218763313U CN218763313U CN202221874949.0U CN202221874949U CN218763313U CN 218763313 U CN218763313 U CN 218763313U CN 202221874949 U CN202221874949 U CN 202221874949U CN 218763313 U CN218763313 U CN 218763313U
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Abstract
The utility model belongs to the technical field of large-scale power plant boiler, a power plant boiler reheat desuperheating water system is related to, including accident desuperheating water system and reheater trace water injection system, accident desuperheating water system includes two parallelly connected accident desuperheating water pipelines, reheater trace water injection system includes two parallelly connected reheater trace water spray pipelines, all set up reheater accident desuperheating water electrically operated gate on two accident desuperheating water pipelines, two reheater trace water spray pipelines all set up reheater trace water spray electrically operated gate, reheater accident desuperheating water electrically operated gate, reheater trace water spray electrically operated gate both ends are parallelly connected to have little footpath bypass, set up little bypass manual isolation door on the little footpath bypass, the utility model discloses owing to close accident desuperheating water and trace water spray electrically operated gate in accident desuperheating water and water regulation front electric door cross-over bypass (normal operating, desuperheating water goes away little bypass), increase resistance, because of the difference reduces around the regulation door, the increase of opening, can avoid the frequent leakage that the door that the excessive scouring arouses causes, eliminate unusual noise, avoid desuperheating water leakage to the influence of electricity generation coal consumption.
Description
Technical Field
The utility model relates to a large-scale power plant boiler technical field, in particular to power plant boiler system of reducing temperature by heat system again.
Background
The large power station boilers are all designed with reheating and desuperheating water systems for controlling metal safety of reheating heating surfaces, reheating steam temperature and deviation adjustment. Some boilers only design accident desuperheating water, and some boilers design accident desuperheating water and reheater trace water spraying at the same time. The reheating and temperature reducing water source is led out from a tap in the middle of a water supply pump, then is divided into two paths, leads to two sides of a reheater, is provided with an electric isolation door in each path, is provided with an adjusting door in the rear of the electric isolation door, and then enters the reheater temperature reducer to realize temperature reduction. If micro-spraying water is designed for temperature reduction, the temperature reduction water is led out from a middle tap of a water feeding pump and then is divided into two branch main pipes, each branch main pipe is divided into two branch pipes, each branch pipe is provided with an electric isolation door, and then is provided with an adjusting door, and then enters a reheater temperature reducer for temperature reduction. The influence of the reheated desuperheating water on the coal consumption of power generation is large (about 0.5g/kWh of coal consumption of power generation is influenced every 10 t/h), so that the maximum amount of reheated desuperheating water does not exceed 15t/h generally even if the boiler is designed to spray a small amount of water.
The problems existing in the prior art are as follows:
the water supply pressure of a tap in the middle of the water supply pump is higher, the pressure of the reheater is lower, so the pressure difference before and after the reheated temperature-reducing water regulating valve is very large, and the maximum pressure difference of the ultra-supercritical, supercritical and subcritical boilers is about 12MPa, 10MPa and 7 MPa. The accident water spray of the reheater is designed to be 0, reheating desuperheating water can be generated under certain special working conditions, but most desuperheating water is small in amount, a boiler with a small amount of water spray is designed, and the desuperheating water is not large generally. The temperature-reducing water quantity is small, the pressure difference between the front and the back of the temperature-reducing water regulating valve is large, the opening degree of the regulating valve is small, the flow area of the door core and the door seat is small, and the flow speed of the temperature-reducing water flowing through the flow area is large, so that the temperature-reducing water regulating valve is rapidly washed away, frequently leaks and generates sharp noise. After the damper leaks, the temperature-reducing water still exists when the temperature-reducing water is not needed, the coal consumption rise of power generation is influenced, the cost is increased by replacing the damper, and the noise causes environmental pollution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: in order to overcome the defects in the prior art, the utility model provides a reheating and desuperheating water system of a power station boiler, which can solve the frequent leakage and noise problems caused by scouring of an accident reheating and desuperheating water gate and a micro water spraying gate.
The technical scheme of the utility model:
the utility model provides a power plant boiler reheat desuperheating water system, including accident desuperheating water system and reheater trace water injection system, accident desuperheating water system includes two parallelly connected accident desuperheating water pipeline, reheater trace water injection system includes two parallelly connected reheater trace water spray pipe ways, all set up reheater accident desuperheating water electrically operated gate on two accident desuperheating water pipeline, two reheater trace water spray pipe ways all set up reheater trace water spray electrically operated gate, reheater accident desuperheating water electrically operated gate, reheater trace water spray electrically operated gate both ends are parallelly connected there is little footpath bypass, set up the manual isolation door of little bypass on the little footpath bypass.
Furthermore, a reheater accident temperature-reducing water regulating valve is arranged on the accident temperature-reducing water pipeline.
Furthermore, a reheater trace water spraying regulating valve is arranged on the reheated steam temperature fine-tuning water spraying pipeline.
Furthermore, the tail end of the accident desuperheating water pipeline is connected with a reheater accident desuperheating water desuperheater.
Furthermore, the tail end of the reheated steam temperature fine-tuning water spraying pipeline is connected with a reheater trace water spraying desuperheater.
Furthermore, a front opening A and a rear opening A are arranged on pipelines at the front end and the rear end of the reheater accident desuperheating water electrically operated door, and the front opening A and the rear opening A are respectively and correspondingly welded with the inlet end and the outlet end of the small-pipe-diameter bypass;
further, the distance from the front opening A to a connecting flange or a welded junction at the front end of the accident temperature-reduction water electric door is more than 200mm; the rear opening A is arranged in the middle of a pipeline between the rear end of the accident desuperheating water electric door and the reheater accident desuperheating water regulating door.
Furthermore, a front opening B and a rear opening B are arranged on pipelines at the front end and the rear end of the reheater trace water spraying electric door, and the front opening B and the rear opening B are correspondingly welded with the inlet end and the outlet end of the small-pipe-diameter bypass respectively.
Further, the distance between the front opening B and a connecting flange or a welded junction at the front end of the micro water spraying electric door of the reheater is more than 200mm; the rear opening B is arranged in the middle of a pipeline between the rear end of the reheater trace water spraying electrically operated gate and the reheater trace water spraying adjusting gate.
Furthermore, grooves are arranged at the openings of the front opening A, the rear opening A, the front opening B and the rear opening B.
Further, a small bypass manual isolation door on the small-caliber bypass is close to the front opening A or the front opening B.
Further, the wall thickness of the pipeline of the small-diameter bypass is not less than 4mm.
Furthermore, a plurality of supporting points are arranged on the side of the small pipe diameter, and the distance between every two adjacent supporting points is 0.5m.
The utility model has the advantages that: compared with the prior art:
the utility model discloses because the small bypass of electrically operated gate cross-over connection (normal operating closes accident desuperheating water and trace water spray electrically operated gate before accident desuperheating water and trace water spray transfer), the little bypass is walked to the desuperheating water, the resistance increases, because of pressure differential reduces around the transfer door under the same desuperheating water yield, the transfer door aperture increases, can avoid the transfer door to erode the frequent leakage that arouses excessively fast, eliminate abnormal noise, practice thrift the valve and change the expense, alleviate and change valve intensity of labour, avoid the desuperheating water to leak the influence to the electricity generation coal consumption.
Drawings
FIG. 1 is a schematic diagram of the system structure of the present invention;
wherein, 1 is a reheater accident desuperheater; 2 is a reheater trace water spraying desuperheater; 3, a reheater accident desuperheating water regulating valve; 4, a reheater micro-amount water spraying valve; 5 is a reheater accident desuperheating water electrically operated gate; 6 is a reheater trace water spraying electric door; 7 is a small-caliber bypass; 8 is a small bypass manual isolating door; 9 is a supporting point; 10. front opening a,11, back opening a,12, front opening B,13, back opening B.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connections between the components, the functions and operating principles of the components, the manufacturing process and the operation and use method, will be further explained in detail to help those skilled in the art to more completely, accurately and deeply understand the conception and technical scheme of the present invention, by referring to the accompanying drawings:
as shown in fig. 1, an embodiment of the present invention provides a reheating attemperation water system of a power station boiler, including an accident attemperation water system and a reheater trace water spraying system, where the accident attemperation water system includes two parallel accident attemperation water pipelines, the reheater trace water spraying system includes two parallel reheater trace water spraying pipelines, two accident attemperation water pipelines are both provided with reheater accident attemperation water electrically operated gates 5, two reheater trace water spraying pipelines are both provided with reheater trace water spraying electrically operated gates 6, two ends of the reheater accident attemperation water electrically operated gates 5 and the reheater trace water spraying electrically operated gates 6 are both connected in parallel with a small-diameter bypass 7, and a small-bypass manual isolation gate 8 is provided on the small-diameter bypass 7; a reheater accident temperature-reducing water regulating door 3 is arranged on the accident temperature-reducing water pipeline; a reheater trace water spraying valve 4 is arranged on the reheater trace water spraying pipeline; the tail end of the accident desuperheating water pipeline is connected with a reheater accident desuperheater 1; the end of the reheated steam temperature fine-tuning water spraying pipeline is connected with a reheater trace water spraying desuperheater 2.
In this embodiment, when designing the small-diameter bypass 7, it is necessary to determine the flow resistance required by the small-diameter bypass 7 through experiments: the amount of reheated and desuperheated water G is commonly used C The experiment is carried out, the reheater accident temperature-reducing water electric door 5 and the reheater micro water spraying electric door 6 are fully opened, and the reheater accident temperature-reducing water regulation is carried outThe opening degree of the door 3 and the opening degree of the reheater trace water spraying adjusting door 4 are K1, the pressure difference between the front and the back of the reheater accident desuperheating water adjusting door 3 and the reheater trace water spraying adjusting door 4 is delta P1, the opening degree of the reheater accident desuperheating water adjusting door 3 and the opening degree of the reheater trace water spraying adjusting door 4 are small, and the internal flowing noise is large. The reheater accident desuperheating water electrically operated gate 5 and the reheater trace water spraying electrically operated gate 6 are gradually closed, the opening degrees of the reheater accident desuperheating water regulating gate 3 and the reheater trace water spraying regulating gate 4 are increased, the front and back pressure difference of the reheater accident desuperheating water regulating gate 3 and the reheater trace water spraying regulating gate 4 is reduced, and the flow noise is reduced. And continuously closing the reheater accident desuperheating water electrically operated gate 5 and the reheater trace water spraying electrically operated gate 6 until the conditions that no flow noise exists in the reheater accident desuperheating water adjusting gate 3 and the reheater trace water spraying adjusting gate 4, the opening degree of the reheater accident desuperheating water adjusting gate 3 and the reheater trace water spraying adjusting gate 4 is 85% of the linear stroke (the opening degree range with the linear relation between the opening degree and the flow), and recording the pressure difference between the front and the back of the reheater accident desuperheating water adjusting gate 3 and the reheater trace water spraying adjusting gate 4 as delta P2. The flow resistance Δ P = Δ P1- Δ P2 required for the small-diameter bypass 7.
In the present embodiment, when designing the small-diameter bypass 7, the inner diameter d and the length L of the small-diameter bypass 7 need to be further determined:
in order to meet the resistance requirement of the small-caliber bypass 7, the inner diameter and the length of the small-caliber bypass 7 are calculated by trial according to the following formula, different inner diameters are selected, the corresponding lengths are calculated, and reasonable inner diameter and length matching are selected from the small-caliber bypass 7 under the condition of meeting the resistance requirement (the flushing speed is high when the inner diameter is too small and the flow speed is too large, and the required length is too long when the flow speed is too large).
Wherein: Δ P is the flow resistance, MPa, required for the small-bore bypass 7.
W is the flow velocity of the small-diameter bypass 7 in m/s. Calculated from the usual flow rate Gc (kg/s) of desuperheated water and the selected diameter.
d is the inner diameter, m, of the small-diameter bypass 7.
L is the length of the small-diameter bypass 7, m.
Upsilon is the specific volume of water in the bypass 7 with small pipe diameter, m 3 In terms of/kg. And looking up a table according to the pressure and the temperature of the desuperheating water.
λ is the coefficient of on-way resistance of the small-diameter bypass 7.
And Σ ξ is the sum of the local resistance coefficients of the small-diameter bypass 7.
In this embodiment, after the inner diameter d and the length L of the small-diameter bypass 7 are determined through tests, a front opening a10 and a rear opening a11 are arranged on the pipelines at the front end and the rear end of the reheater accident desuperheating water electric door 5, and the front opening a10 and the rear opening a11 are respectively welded with the inlet end and the outlet end of the small-diameter bypass 7 correspondingly; the distance from the front opening A10 to a connecting flange or a welded junction at the front end of the accident desuperheating water electric door 5 is more than 200mm; the rear opening A11 is arranged in the middle of a pipeline between the rear end of the accident desuperheating water electric door 5 and the reheater accident desuperheating water regulating door 3.
In addition, a front opening B12 and a rear opening B13 are arranged on pipelines at the front end and the rear end of the reheater micro-spraying electric door 4, the front opening B12 and the rear opening B13 are correspondingly welded with the inlet end and the outlet end of the small-pipe-diameter bypass 7 respectively, and the distance between the front opening B12 and a connecting flange or a welded junction at the front end of the reheater micro-spraying electric door 6 is more than 200mm; the rear opening B13 is arranged in the middle of a pipeline between the rear end of the reheater trace water spraying electric door 6 and the reheater trace water spraying adjusting door 4.
In this embodiment, grooves are provided at the openings of the front opening a10, the rear opening a11, the front opening B12, and the rear opening B13 to improve the welding quality, and then. Two ends of the small-caliber bypass 7 are inserted into the front and back openings of the accident desuperheating water and micro water spraying electric door, the depth of the small-caliber bypass 7 inserted into the openings is-0.5 mm of the wall thickness of the perforated pipe, and the pipe orifices at two ends of the small-caliber bypass 7 are flush. The two ends of the small-diameter bypass 7 and the groove of the front opening and the rear opening are fully welded, the small-diameter bypass 7 can be made of a temperature-reduced water main pipe and the like, and the wall thickness is not less than 4mm.
In this embodiment, the manual isolation door 8 of little bypass on the small pipe footpath bypass 7 is close to preceding trompil A10 or preceding trompil B12, and the manual isolation door 8 of little bypass is opened in normal operating, can close the isolation when needing, and the manual isolation door 8 pressure-bearing of little bypass, temperature resistant grade are the same with former desuperheating water pipeline, valve.
In the embodiment, in order to prevent the small-caliber bypass 7 from vibrating, a plurality of supporting points 9 are arranged on the small-caliber bypass 7, and the distance between every two adjacent supporting points 9 is 0.5m.
In this embodiment, the reheater wall temperature (steam temperature) is interlocked with the emergency desuperheating water and the trace amount water spraying electric door, and when the wall temperature (steam temperature) is higher than a specified value and the small bypass does not meet the desuperheating requirement, the emergency desuperheating water and the trace amount water spraying electric door are automatically opened.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, replacements, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all should be included in the protection scope of the present invention.
Claims (13)
1. The utility model provides a power plant boiler reheat desuperheating water system, includes accident desuperheating water system and re-heater trace water spray system, and accident desuperheating water system includes two parallelly connected accident desuperheating water pipelines, and re-heater trace water spray system includes two parallelly connected re-heater trace water spray pipelines, all sets up re-heater accident desuperheating water electrically operated gate on two accident desuperheating water pipelines, and two re-heater trace water spray pipelines all set up re-heater trace water spray electrically operated gate, its characterized in that: two ends of the reheater accident desuperheating water electrically operated gate and the reheater trace water spraying electrically operated gate are connected in parallel with a small-pipe-diameter bypass, and a small-bypass manual isolation gate is arranged on the small-pipe-diameter bypass.
2. The utility boiler reheating temperature-reducing water system according to claim 1, wherein: and a reheater accident temperature-reducing water regulating valve is arranged on the accident temperature-reducing water pipeline.
3. The utility boiler reheating temperature-reducing water system according to claim 1, wherein: and a reheater trace water spraying valve is arranged on the reheater trace water spraying pipeline.
4. The utility boiler reheating temperature-reducing water system according to claim 2, wherein: the tail end of the accident desuperheating water pipeline is connected with a reheater accident desuperheater.
5. The utility boiler reheating temperature-reducing water system according to claim 3, wherein: the tail end of the reheated steam temperature fine-tuning water spraying pipeline is connected with a reheater trace water spraying desuperheater.
6. The utility boiler reheating temperature-reducing water system according to claim 2, wherein: a front opening A and a rear opening A are arranged on pipelines at the front end and the rear end of the reheater accident desuperheating water electrically operated door, and the front opening A and the rear opening A are correspondingly welded with the inlet end and the outlet end of the small-pipe-diameter bypass respectively.
7. The utility boiler reheating temperature-reducing water system according to claim 6, wherein: the distance from the front opening A to a connecting flange or a welded junction at the front end of the accident desuperheating water electric door is more than 200mm; the rear opening A is arranged in the middle of a pipeline between the rear end of the accident desuperheating water electric door and the reheater accident desuperheating water regulating door.
8. The utility boiler reheating temperature-reducing water system according to claim 6, wherein: the front opening B and the rear opening B are arranged on pipelines at the front end and the rear end of the reheater micro-spray electrically operated gate, and the front opening B and the rear opening B are correspondingly welded with the inlet end and the outlet end of the small-pipe-diameter bypass respectively.
9. The utility boiler reheating temperature-reducing water system according to claim 8, wherein: the distance between the front opening B and a connecting flange or a welded junction at the front end of the micro water spraying electric door of the reheater is more than 200mm; the rear opening B is arranged in the middle of a pipeline between the rear end of the reheater trace water spraying electrically operated gate and the reheater trace water spraying adjusting gate.
10. The utility boiler reheating temperature-reducing water system according to claim 8, wherein: grooves are arranged at the openings of the front opening A, the rear opening A, the front opening B and the rear opening B.
11. The utility boiler reheating temperature-reducing water system according to claim 8, wherein: and a small bypass manual isolation door on the small-caliber bypass is close to the front opening A or the front opening B.
12. The utility boiler reheat desuperheating water system of claim 11, wherein: the wall thickness of the pipeline of the small-diameter bypass is not less than 4mm.
13. The utility boiler reheat desuperheating water system of claim 11, wherein: a plurality of supporting points are arranged on the side path with small pipe diameter, and the distance between every two adjacent supporting points is 0.5m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221874949.0U CN218763313U (en) | 2022-07-19 | 2022-07-19 | Reheating and temperature reducing water system of power station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221874949.0U CN218763313U (en) | 2022-07-19 | 2022-07-19 | Reheating and temperature reducing water system of power station boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218763313U true CN218763313U (en) | 2023-03-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221874949.0U Active CN218763313U (en) | 2022-07-19 | 2022-07-19 | Reheating and temperature reducing water system of power station boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218763313U (en) |
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2022
- 2022-07-19 CN CN202221874949.0U patent/CN218763313U/en active Active
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