CN119933816A - Exhaust steam cooling water control system for preventing blade damage of cylinder cutting unit/deep peak regulation unit - Google Patents
Exhaust steam cooling water control system for preventing blade damage of cylinder cutting unit/deep peak regulation unit Download PDFInfo
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- CN119933816A CN119933816A CN202510071305.XA CN202510071305A CN119933816A CN 119933816 A CN119933816 A CN 119933816A CN 202510071305 A CN202510071305 A CN 202510071305A CN 119933816 A CN119933816 A CN 119933816A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application provides a blade damage prevention steam exhaust temperature reduction water regulation system of a cylinder cutting unit/deep peak regulation unit, which belongs to the technical field of thermal power unit thermal decoupling and deep peak regulation, and comprises a water supply system which is communicated with a condensed water pipeline of the unit, wherein condensed water is used as a water source, a pressurizing device is used for increasing the pressure of temperature reduction water, the temperature reduction water is sprayed to the final steam exhaust side of a low-pressure cylinder through an atomizing system to reduce atomized particles of the temperature reduction water and reduce the spray quantity of the steam exhaust temperature reduction water, and meanwhile, the temperature reduction water enters the atomizing system in a high-pressure state to form high-pressure spray so as to enlarge the spray coverage area of the temperature reduction water and improve the steam exhaust temperature reduction effect and efficiency of the tail end of the low-pressure cylinder.
Description
Technical Field
The application belongs to the technical field of thermal decoupling and deep peak shaving units in the thermal power industry, and particularly relates to a blade damage prevention steam exhaust temperature reduction water regulation system of a cylinder cutting unit/deep peak shaving unit.
Background
With the development of new energy, the proportion of new energy represented by wind power and solar power generation on the power generation side is increasing. However, due to the uncontrollable and unstable characteristics of new energy, the thermal power generation with better control performance is required by the power supply quality and the power grid stability. Under the background that the demand for the deep regulation capability of the thermal power unit is continuously increased, the thermal power unit low-pressure cylinder cutting operation and deep peak regulation operation technologies are generated, the power supply quality and the power grid stability of the thermal power unit are ensured, and the transformation demand of an electric power system is met.
However, the operation of the cylinder cutting unit/depth peak shaving unit also brings challenges to the safety of the last stage and the next-to-last stage blades of the steam turbine, namely, after the unit is operated in a cylinder cutting mode or in a low load mode, the steam exhaust temperature of the low-pressure cylinder is too high to cause non-negligible influence on the safety of the steam turbine generator unit. At present, condensed water is generally adopted in the industry to reduce the temperature of low-pressure cylinder exhaust steam, however, the condensed water particles are larger and the cooling effect is poor when the unit runs under low load, so that more condensed water needs to be introduced, a large amount of condensed water is discharged into the low-pressure cylinder exhaust steam, meanwhile, the unit runs under low load, the low-pressure cylinder exhaust steam can form vortex, a large amount of condensed water can flow back to blades along with the vortex, impact the last-stage and penultimate-stage blades, damage and even break the last-stage and penultimate-stage blades, not only affecting the safety of a steam turbine, but also affecting the economy of the unit and the overall benefit of a power plant.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
In view of this, according to an embodiment of the present application, a system for controlling steam exhaust and temperature reduction of a cylinder cutting unit/a depth peak shaver unit for preventing damage to blades is provided, comprising:
the water supply system is arranged outside the unit, the input end of the water supply system is communicated with a condensed water pipeline of the unit, and the condensed water pipeline provides the water supply system with the temperature reduction water;
The water supply system is provided with a supercharging device, and the supercharging device comprises a temperature reduction water booster pump so as to increase the output pressure of the temperature reduction water in the water supply system;
The atomization system is communicated with the output end of the water supply system, is arranged on the final steam exhaust side of the low-pressure cylinder of the unit, and sprays the temperature-reduced water to the final steam exhaust side of the low-pressure cylinder.
In one possible implementation mode, the tail end of the low-pressure cylinder is provided with a condenser, the condenser condenses the steam discharged by the low-pressure cylinder into condensed water, and the input end of a condensed water pipeline is communicated with a hot well of the condenser;
the condensate pipe is provided with a condensate pump, and the input end of the water supply system is communicated with the output end of the condensate pump.
In one possible embodiment, the water supply is arranged close to the low pressure cylinder.
In one possible embodiment, the water supply system comprises a desuperheating water bypass and two desuperheating water branch pipes, wherein the two desuperheating water branch pipes are arranged in parallel on the desuperheating water bypass.
In a possible embodiment, supercharging device sets up on the desuperheating water branch pipe, and supercharging device corresponds with desuperheating water branch pipe one by one, and supercharging device includes:
a desuperheating water booster pump arranged on the desuperheating water branch pipe;
the manual isolation door of the temperature reduction water booster pump inlet is arranged on the temperature reduction water branch pipe, and the manual isolation door of the temperature reduction water booster pump inlet is positioned at the input end of the temperature reduction water branch pipe;
the electric isolation door of the outlet of the temperature reduction water booster pump is arranged on the temperature reduction water branch pipe, the electric isolation door of the outlet of the temperature reduction water booster pump is positioned at the output end of the temperature reduction water branch pipe, and the temperature reduction water booster pump is closed and isolated through the electric isolation door of the outlet of the temperature reduction water booster pump and the manual isolation door of the inlet of the temperature reduction water booster pump;
The temperature-reducing water check valve is arranged on the temperature-reducing water branch pipe, is positioned at the output end of the temperature-reducing water booster pump, and is close to the temperature-reducing water booster pump;
The temperature reducing water regulating door is arranged on the temperature reducing water branch pipe, is positioned between the temperature reducing water check valve and the electric isolation door at the outlet of the temperature reducing water booster pump, and is used for controlling the temperature reducing water quantity output by the temperature reducing water branch pipe.
In one possible embodiment, a desuperheating water bypass door is arranged on the desuperheating water bypass and is used for controlling the communication state between the output end of the condensate pump and the atomization system.
In a possible implementation manner, the blade damage prevention and steam exhaust temperature reduction water regulation system of the cylinder cutting unit/depth peak shaver unit further comprises:
the temperature reduction water pressure remote sensing point is arranged at the output end of the temperature reduction water supply system, and is close to the atomization system to detect the temperature reduction water pressure entering the atomization system.
In one possible embodiment of the present invention,
One of the two temperature reducing water branch pipes is a working temperature reducing water branch pipe, and the other is a standby temperature reducing water branch pipe;
When the temperature reduction water pressure of the working temperature reduction water branch pipe is lower than 3MPa, the standby temperature reduction water branch pipe is started.
In one possible embodiment, the atomizing system comprises:
The input end of the water spraying pipe is communicated with the output end of the water supply system;
the spray nozzles are arranged on the spray pipes, and spray atomized heat-reducing water to the final steam exhaust side of the low-pressure cylinder.
In one possible embodiment, the nozzle includes a compressed inlet liquid end to introduce compressed desuperheated water into the outlet of the nozzle through the compressed inlet liquid end.
Compared with the prior art, the blade damage prevention steam exhaust temperature reduction water regulation system of the cylinder cutting unit/depth peak shaving unit has the beneficial effects that:
The blade damage prevention steam-exhaust temperature-reducing water regulation system of the cylinder cutting unit/depth peak regulation unit comprises a water supply system and an atomization system, wherein the water supply system is communicated with a condensed water pipeline of the unit, condensed water in the condensed water pipeline is used as a water source, the pressure of the temperature-reducing water is increased by a pressurizing device, the temperature-reducing water is sprayed to the final steam exhaust side of a low-pressure cylinder through the atomization system, the atomized particles of the temperature-reducing water are reduced, the sprayed quantity of the steam-exhaust temperature-reducing water is reduced, meanwhile, the temperature-reducing water enters the atomization system in a high-water pressure state to form high-pressure spray, the sprayed coverage area of the temperature-reducing water can be enlarged, the high-pressure spray is better mixed with steam exhausted by the low-pressure cylinder, and the steam-exhaust temperature-reducing effect and efficiency of the tail end of the low-pressure cylinder can be improved; through the setting of the temperature reduction water regulation and control system, the atomized temperature reduction water is directly sprayed to the steam exhaust position of the low-pressure cylinder, so that the atomized temperature reduction water is quickly combined with steam, the steam exhaust temperature reduction effect and efficiency of the tail end of the low-pressure cylinder are improved, the consumption of the temperature reduction water of the tail end steam exhaust of the low-pressure cylinder is reduced, the liquid drops are reduced, the coverage area is increased, a large amount of poorly atomized steam exhaust temperature reduction water is prevented from flowing back to the last stage blade and the next-to-last stage blade of the low-pressure cylinder along with the vortex flow of the steam exhaust, the damage to the last stage blade and the next-to-last stage blade of the steam turbine is reduced, the blade breakage accident is avoided, and the safety of the thermal power industry and the operation of a power grid is promoted.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of a blade damage prevention steam exhaust temperature reduction water regulation system of a cylinder cutting unit/depth peak shaver unit;
FIG. 2 is a schematic structural diagram of a water supply system of a blade damage prevention steam exhaust temperature reduction water regulation system of a cylinder cutting unit/depth peak shaver unit according to an embodiment of the application;
Wherein, the correspondence between the reference numerals and the component names in fig. 1 and 2 is:
11. A water supply system; 12 parts of an atomization system, 13 parts of a low-pressure cylinder, 14 parts of a condensed water pipeline, 16 parts of a condenser, 17 parts of a condensed water pump, 18 parts of a supercharging device, 19 parts of a temperature reduction water pressure remote transmission point, 20 parts of a temperature reduction water bypass door;
111. A desuperheating water bypass 112;
121. A water spray pipe 122, a nozzle;
181. A desuperheating water booster pump, 182, a manual isolation door at the inlet of the desuperheating water booster pump, 183, an electric isolation door at the outlet of the desuperheating water booster pump, 184, a desuperheating water check door, 185, and a desuperheating water regulating door.
Detailed Description
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
As shown in fig. 1, according to the embodiment of the application, a blade damage prevention exhaust temperature reduction water regulation system of a cylinder cutting unit/depth peak shaving unit is provided, which comprises a water supply system 11 and an atomization system 12, wherein the water supply system 11 is arranged outside the unit, the input end of the water supply system 11 is communicated with a condensation water pipeline 14 of the unit, the condensation water pipeline 14 provides temperature reduction water for the water supply system 11, a pressurizing device 18 is arranged on the water supply system 11, the pressurizing device 18 comprises a temperature reduction water booster pump 181 for increasing the output pressure of the temperature reduction water in the water supply system 11, the atomization system 12 is communicated with the output end of the water supply system 11, the atomization system 12 is arranged on the final steam exhaust side of a low-pressure cylinder 13 of the unit, and the atomization system 12 sprays the temperature reduction water on the final steam exhaust side of the low-pressure cylinder 13.
The blade damage prevention steam exhaust temperature reduction water regulation system of the cylinder cutting unit/depth peak shaving unit provided by the embodiment of the application comprises a water supply system 11 and an atomization system 12, wherein the water supply system 11 is communicated with a condensation water pipeline 14 of the unit, condensation water in the condensation water pipeline 14 is used as a water source, a supercharging device 18 is used for increasing the pressure of temperature reduction water, the atomization system 12 is used for spraying the temperature reduction water to the final steam exhaust side of a low-pressure cylinder 13, so that the atomized particles of the temperature reduction water are reduced, the sprayed quantity of the steam exhaust temperature reduction water is reduced, and meanwhile, the temperature reduction water enters the atomization system 12 in a high-pressure state to form high-pressure spray, so that the sprayed coverage area of the temperature reduction water can be enlarged, the high-pressure spray can be well mixed with steam exhausted by the low-pressure cylinder 13, and the steam exhaust temperature reduction effect and efficiency of the tail end of the low-pressure cylinder 13 can be improved; through the setting of the temperature reduction water regulation and control system, the atomized temperature reduction water is directly sprayed to the steam discharge position of the low-pressure cylinder 13, so that the atomized temperature reduction water is quickly combined with steam, the steam discharge temperature reduction effect and efficiency of the tail end of the low-pressure cylinder 13 are improved, the consumption of the temperature reduction water discharged by the tail end of the low-pressure cylinder 13 is reduced, the liquid drops are reduced, the coverage area is increased, a large amount of poorly atomized steam discharge temperature reduction water is prevented from flowing back to the last stage blade and the next-to-last stage blade of the low-pressure cylinder 13 along with vortex flow, the damage to the last stage blade and the next-to-last blade of a steam turbine is reduced, the blade breakage accident is avoided, and the safety of the thermal power industry and the operation of a power grid is promoted.
The desuperheating water is a part of liquid in the condensed water generated by the exhaust steam of the low-pressure cylinder 13, and the consumption of the desuperheating water is reduced by atomizing the desuperheating water, so that the effective utilization of the condensed water is realized.
As shown in fig. 1, in a possible embodiment, a condenser 16 is arranged at the tail end of the low-pressure cylinder 13, the condenser 16 condenses the steam discharged by the low-pressure cylinder 13 into condensed water, the input end of a condensed water pipeline 14 is communicated with a hot well of the condenser 16, a condensed water pump 17 is arranged on the condensed water pipeline 14, and the input end of the water supply system 11 is communicated with the output end of the condensed water pump 17.
In the technical scheme, after steam enters the low-pressure cylinder 13 to do work, the steam is discharged to the condenser 16 from the last stage of the low-pressure cylinder 13, the condenser 16 condenses the steam discharged from the low-pressure cylinder 13 into condensate, the condensate enters the condensate pump 17 through the condensate pipeline 14, and the condensate is pressurized by the condensate pump 17 and then is conveyed to the low-pressure heater and the deaerator, so that the temperature of the condensate is increased, the thermal efficiency of the unit is improved, the oxygen content of the condensate is reduced, and corrosion to equipment is avoided.
As shown in fig. 1, in one possible embodiment, the water supply 11 is arranged close to the low pressure cylinder 13.
In the technical scheme, the water supply system 11 is arranged at the position, close to the low-pressure cylinder 13, outside the steam turbine so as to shorten the pipeline arrangement length of the temperature reduction water regulating system and the on-way resistance of the fluid, thereby being beneficial to reducing the power consumption of the temperature reduction water regulating system and saving the use cost.
In one possible embodiment, one desuperheating water bypass 111 and two desuperheating water branch pipes 112, the two desuperheating water branch pipes 112 being arranged in parallel on the desuperheating water bypass 111.
In this technical scheme, the desuperheating water bypass 111 and two desuperheating water branch pipes 112 are connected in parallel, supercharging device 18 is arranged on desuperheating water branch pipe 112, desuperheating water branch pipe 112 pressurizes desuperheating water through desuperheating water booster pump 181 to improve atomization effect of atomization system 12, through making desuperheating water bypass 111 and desuperheating water branch pipe 112 parallel connection, so as to ensure that desuperheating water can enter atomization system 12 through desuperheating water bypass 111 when two desuperheating water branch pipes 112 fail, steam exhaust desuperheating to low-pressure cylinder 13 is not affected, and stable operation of the unit is ensured.
It is understood that a plurality of temperature reducing water branch pipes 112 may be provided, one temperature reducing water branch pipe 112 works, and the rest of temperature reducing water branch pipes 112 serve as standby pipelines for temperature reducing water pressurization, so that reliable and stable operation of the unit is ensured.
As shown in FIG. 2, in one possible embodiment, the pressurizing device 18 is arranged on the desuperheating branch pipe 112, the pressurizing device 18 corresponds to the desuperheating branch pipe 112 one by one, the pressurizing device 18 comprises a desuperheating booster pump 181 arranged on the desuperheating branch pipe 112, a desuperheating booster pump 181 inlet manual isolation door, a desuperheating booster pump 181 outlet electric isolation door, a desuperheating check valve 184 and a desuperheating booster pump 185, the desuperheating booster pump 181 inlet manual isolation door is arranged on the desuperheating branch pipe 112, the desuperheating booster pump 181 inlet manual isolation door is arranged at the input end of the desuperheating branch pipe 112, the desuperheating booster pump 181 outlet electric isolation door is arranged on the desuperheating booster pump 112, the desuperheating booster pump 181 outlet electric isolation door is arranged at the output end of the desuperheating booster pump 181, the desuperheating booster pump 184 is arranged on the desuperheating branch pipe 112, the desuperheating booster pump 181 outlet electric isolation door is arranged at the output end of the desuperheating booster pump 181, and the desuperheating booster pump 185 is arranged near the desuperheating booster pump 185, the desuperheating booster pump 181 outlet electric isolation door is arranged between the desuperheating booster pump 181 outlet electric isolation door and the desuperheating booster pump control valve, and the desuperheating booster pump 181 outlet electric isolation door is arranged at the desuperheating booster pump 181.
In the technical scheme, a desuperheating water booster pump 181 is arranged on a desuperheating water booster pump 112 and is used for boosting desuperheating water conveyed by the desuperheating water booster pump 112, a manual isolation door at an inlet of the desuperheating water booster pump 181 is positioned at an input end of the desuperheating water booster pump 112, an electric isolation door at an outlet of the desuperheating water booster pump 181 is arranged on the desuperheating water booster pump 112, when one desuperheating water booster pump 112 needs to be overhauled, the electric isolation door at the outlet of the desuperheating water booster pump 181 and the manual isolation door at an inlet of the desuperheating water booster pump 181 isolate the corresponding desuperheating water booster pump 112 from other pipelines, so that the desuperheating water booster pump 181 does not flow backwards after being stopped, the normal operation of a unit is avoided, and a proper quantity of desuperheating water is ensured by arranging a desuperheating water regulating door 185 on the desuperheating water booster pump 112 so as to regulate the quantity of desuperheating water supply to be matched with the quantity of steam in real time.
Further, the temperature-reducing water booster pump 181 is connected with a frequency modulation motor, and the temperature-reducing water booster pump 181 is driven by the frequency modulation motor to accurately control the rotating speed of the temperature-reducing water booster pump 181, so that the temperature-reducing water pressure of the output end of the temperature-reducing water booster pump 181 is optimized, and the stability of the water pressure after temperature-reducing water booster pump 181 is guaranteed.
Further, the manual isolation door is arranged at the inlet of the temperature reduction water booster pump 181, and the electric isolation door is arranged at the outlet of the temperature reduction water booster pump 181, so that after the system fails, the manual isolation door at the inlet of the temperature reduction water booster pump 181 and the electric isolation door at the outlet of the temperature reduction water booster pump 181 can be quickly and reliably closed, and the temperature reduction water branch pipe 112 is isolated.
Further, when the temperature reducing water branch pipe 112 works, the opening of the temperature reducing water regulating door 185 controls the steam exhaust temperature of the low pressure cylinder 13 to be within a given range, and the frequency modulation motor controls the pressure of the temperature reducing water to be within a range of 4-5 MPa.
As shown in fig. 1 and 2, in one possible embodiment, a desuperheating water bypass 111 door 20 is provided on the bypass pipe, and the desuperheating water bypass 111 door 20 is used to control the communication state of the output end of the condensate pump 17 and the atomizing system 12.
In the technical scheme, the communication state between the output end of the condensate pump 17 and the atomization system 12 is controlled through the temperature reduction water bypass 111 door 20, when the temperature reduction water branch pipe 112 fails, the output end of the condensate pump 17 is communicated with the atomization system 12 by opening the temperature reduction water bypass 111 door 20, and the steam exhaust and temperature reduction of the low-pressure cylinder 13 are continuously carried out, so that the unit can run stably.
In the technical scheme, when any equipment in the desuperheating water regulating doors 185, the desuperheating water check doors 184 and the desuperheating water booster pumps 181 of the two desuperheating water branch pipes 112 fails, the desuperheating water branch pipes 112 can be utilized to operate for a short period of time and directly supply water to the atomization system 12 under the condition that the two desuperheating water branch pipes 112 cannot normally operate, so that continuous and uninterrupted desuperheating water spraying is ensured.
As shown in fig. 1 and 2, in one possible embodiment, the blade damage prevention and steam exhaust temperature reduction regulation system of the cylinder cutting unit/depth peak shaver unit further comprises a temperature reduction water pressure remote sensing point 19, wherein the temperature reduction water pressure remote sensing point 19 is arranged on an output end of the water supply system 11, and the temperature reduction water pressure remote sensing point 19 is arranged close to the atomization system 12 so as to detect the temperature reduction water pressure entering the atomization system 12.
In this technical scheme, set up the remote sensing point 19 of desuperheating water pressure on the position that is close to atomizing system 12 on desuperheating water outlet parent tube section to detect the desuperheating water pressure that gets into atomizing system 12, thereby be convenient for adjust desuperheating water booster pump 181 and atomizing system 12 according to desuperheating water pressure, make the spraying volume of desuperheating water match with the steam discharge volume of low pressure jar 13, ensure to carry out effective desuperheating to low pressure jar 13 end, avoid the waste of desuperheating water simultaneously, improve the utilization efficiency of desuperheating water.
Wherein the main pipe section of the desuperheating water outlet is positioned at the output end of the water supply system 11.
Further, the temperature reduction water regulation and control system is electrically connected with a control system of the unit, the temperature reduction water pressure remote sensing point 19 is connected with the control system, and the control system is used for receiving signals of the temperature reduction water pressure remote sensing point 19 so as to regulate the water supply system 11 and the atomization system 12.
In one possible embodiment, one of the two desuperheating water branch pipes 112 is a main desuperheating water branch pipe 112 and the other is a standby desuperheating water branch pipe 112, and when the desuperheating water pressure of the main desuperheating water branch pipe 112 is lower than 3MPa, the standby desuperheating water branch pipe 112 is started.
In this technical scheme, two attemperation water branch pipes 112 are mutually standby, when one attemperation water branch pipe 112 fails, the other attemperation water branch pipe 112 can be immediately put into use to ensure continuity of attemperation water pressurization work, thereby ensuring continuity of attemperation of exhaust steam at the tail end of the low-pressure cylinder 13.
In the technical scheme, the temperature reduction booster pumps 181 of the two temperature reduction water branch pipes 112 and the electric isolation door at the outlet are controlled through logic protection, when the temperature reduction booster pumps 181 of the main temperature reduction water branch pipes 112 trip, the temperature reduction booster pumps 181 of the standby temperature reduction water branch pipes 112 are started, when the temperature reduction water pressure remote sensing points 19 detect that the pressure of the temperature reduction water is lower than 3MPa, the standby temperature reduction water branch pipes 112 are started, and the problem that the main temperature reduction water booster pumps 181 fail to cause the temperature reduction of the temperature reduction water pressure so as to not meet the requirements of exhaust steam temperature reduction is avoided.
Further, when the exhaust steam temperature of the tail end of the low pressure cylinder 13 is higher than the set protection fixed value, the standby temperature-reducing water booster pump 181 is started, and the main temperature-reducing water booster pump 181 and the standby temperature-reducing water booster pump 181 work simultaneously, so that the condition that the exhaust steam temperature is too high due to the fact that the operation of the single temperature-reducing water booster pump 181 cannot meet the exhaust steam temperature requirement under special working conditions is avoided. When the pressure of the condensed water in the condensed water pipeline 14 is less than 0.2MPa, the two temperature-reducing water booster pumps 181 stop running, the unit is judged to stop running, the steam discharge temperature-reducing water is not needed to work, and the two temperature-reducing water booster pumps 181 do not run.
In one possible embodiment, as shown in fig. 1, the atomizing system 12 comprises a spray pipe 121 and nozzles 122, wherein the input end of the spray pipe 121 is communicated with the output end of the water supply system 11, a plurality of nozzles 122 are arranged on the spray pipe 121, and the nozzles 122 spray atomized desuperheating water to the final steam discharge side of the low-pressure cylinder 13.
In this technical scheme, the de-ionized water after being pressurized by the water supply system 11 enters each nozzle 122 through the water spray pipe 121, and the nozzles 122 perform atomization injection on the high-pressure de-ionized water to reduce the consumption of the de-ionized water discharged by the low-pressure cylinder 13, and meanwhile, particles after de-ionized water atomization are smaller, even if the atomized de-ionized water flows back to the blades along with vortex formed by the steam discharged by the low-pressure cylinder 13, the impact on the blades of the last stage and the next-to-last stage is very small, and the damage on the blades of the last stage and the next-to-last stage can be reduced.
In one possible embodiment, the nozzle 122 includes a compressed inlet liquid end to introduce compressed desuperheated water into the nozzle 122 outlet through the compressed inlet liquid end.
In the technical scheme, compressed desuperheating water is introduced into the outlet of the nozzle 122 through the liquid end of the compression inlet to interact in the nozzle 122, uniform mist with small mist droplet particle size is generated, the atomization effect of the desuperheating water is improved by utilizing mutual collision and friction of gas-liquid two phases, a large amount of desuperheating water with poor atomization is prevented from entering the blades, and the blades of the final stage and the penultimate stage are impacted, so that damage to the blades of the final stage and the penultimate stage due to low atomization degree of the desuperheating water is reduced.
Further, the nozzle 122 adopts an umbrella-shaped atomization adjustable nozzle to adjust the atomization effect of the de-superheated water according to the exhaust amount of the low-pressure cylinder 13.
Further, the nozzle 122 adopts a double-head double-eccentric nozzle, and the flow rate of the de-ionized water in the atomizing injection cavity of the double-head double-eccentric nozzle is half that of a standard nozzle, so that the smaller droplet size can be obtained, and the atomizing effect of the de-ionized water is improved.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510071305.XA CN119933816A (en) | 2025-01-16 | 2025-01-16 | Exhaust steam cooling water control system for preventing blade damage of cylinder cutting unit/deep peak regulation unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510071305.XA CN119933816A (en) | 2025-01-16 | 2025-01-16 | Exhaust steam cooling water control system for preventing blade damage of cylinder cutting unit/deep peak regulation unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119933816A true CN119933816A (en) | 2025-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510071305.XA Pending CN119933816A (en) | 2025-01-16 | 2025-01-16 | Exhaust steam cooling water control system for preventing blade damage of cylinder cutting unit/deep peak regulation unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119933816A (en) |
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2025
- 2025-01-16 CN CN202510071305.XA patent/CN119933816A/en active Pending
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