CN210768939U - Distributed combined cycle unit heat supply system for cooling last-stage blade of steam turbine - Google Patents
Distributed combined cycle unit heat supply system for cooling last-stage blade of steam turbine Download PDFInfo
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- CN210768939U CN210768939U CN201921378744.1U CN201921378744U CN210768939U CN 210768939 U CN210768939 U CN 210768939U CN 201921378744 U CN201921378744 U CN 201921378744U CN 210768939 U CN210768939 U CN 210768939U
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Abstract
The utility model belongs to the technical field of combined cycle heat supply and control, in particular to a distributed combined cycle unit heat supply system for cooling a last-stage blade of a steam turbine, which comprises a gas turbine generator unit, a waste heat boiler, a steam turbine generator unit, a low-pressure steam pocket, a high-pressure steam pocket, a condensate pump, a water feed pump, a pipeline and a valve; the steam is supplemented in the steam turbine cylinder through the steam supplementing regulating valve arranged behind the rotary partition plate, and the last-stage blade of the steam turbine is cooled due to the increase of steam flow, so that the problem of high-temperature blast damage of the last-stage blade caused by the reduction of steam flow after the rotary partition plate is closed to extract steam and supply heat is solved; when the power of the turbonator is less than 30% of the rated load and the steam supply source is insufficient, the exhaust cylinder of the steam turbine can be sprayed with water by automatically opening the exhaust cylinder water spraying valve, so that the temperature of the last-stage blade of the steam turbine is reduced, and the problem of preventing the last-stage blade of the steam turbine from being damaged is solved.
Description
Technical Field
The utility model belongs to the technical field of combined cycle heat supply and control, concretely relates to distributed combined cycle unit heating system of cooling steam turbine last stage blade.
Background
The distributed energy source has small capacity, can be started and stopped flexibly, can quickly respond to the requirements of electric power and heat, plays an important role in maintaining the stability of a power grid, can be installed nearby power users or heat users due to convenient layout, reduces the network loss and heat loss caused by distance transmission, and is an effective mode for heating, power supply and heat supply of a small boiler with low potential generation efficiency and serious air pollution. However, the capacity of the distributed energy is small, the capacity of a steam turbine generator set matched with the distributed energy is low, the through-flow steam quantity of the last stage blade is small when steam extraction and steam supply are adopted, and the high temperature caused by insufficient cooling of the last stage blade due to the small through-flow steam quantity endangers the safe operation of the last stage blade.
Disclosure of Invention
In order to solve the problem, the utility model provides a distributed combined cycle unit heating system of cooling steam turbine last stage blade, concrete technical scheme is as follows:
a distributed combined cycle unit heat supply system for cooling a last-stage blade of a steam turbine comprises a gas turbine generator unit, a waste heat boiler, a steam turbine generator unit, a low-pressure steam drum, a high-pressure steam drum, a condensate pump, a water feed pump, a pipeline and a valve;
the gas turbine generator set comprises a gas turbine generator, an air compressor and a gas turbine; the gas turbine generator, the air compressor and the gas turbine are sequentially connected; the air compressor and the gas turbine are respectively connected with the combustion chamber; the combustion chamber is connected with a fuel gas pipeline through a fuel regulating valve;
the waste heat boiler comprises a condensed water heater, a low-pressure evaporator, a low-pressure superheater, a feed water heater, a high-pressure evaporator and a high-pressure superheater;
the steam turbine generator unit comprises a steam turbine, a rotary clapboard arranged in the steam turbine, a steam turbine generator and a condenser; the steam turbine is respectively connected with a turbine generator and a condenser; the steam turbine supplies steam to the outside through a heat supply regulating valve; the steam turbine drives a coaxial steam turbine generator to do work and generate electricity; the rotary clapboard adjusts the steam supply pressure of the steam turbine through rotation so as to meet the demand of heat supply steam flow;
the condenser is connected with a condensed water heater through a condensed water pump and a low-pressure steam drum water level regulating valve, and the condensed water heater, the low-pressure evaporator and the low-pressure superheater are respectively connected with the low-pressure steam drum; the condensate pump is used for conveying water condensed by the condenser to the low-pressure steam drum through the condensate water heater, the water in the low-pressure steam drum is changed into saturated steam through the low-pressure evaporator, the saturated steam in the low-pressure steam drum is changed into superheated steam through the low-pressure superheater, and the formed superheated steam enters a rear cavity of a rotary partition plate of the steam turbine through the steam supplementing regulating valve and the steam supplementing check valve and is used for realizing steam supplementing cooling of a last-stage blade of the steam turbine; when the steam turbine does not operate, opening a low-pressure bypass valve to input superheated steam at the outlet of the low-pressure superheater into a condenser for cooling and condensing for recycling;
the water supply pump is respectively connected with the low-pressure steam drum and the water supply heater; the feed water heater, the high-pressure evaporator and the high-pressure superheater are respectively connected with the high-pressure steam drum; the water supply pump is used for conveying water of the low-pressure steam pocket to the high-pressure steam pocket through the water supply heater; the water in the high-pressure steam pocket is changed into saturated steam through the high-pressure evaporator, the saturated steam in the high-pressure steam pocket is changed into superheated steam through the high-pressure superheater, the formed superheated steam enters the steam turbine through the steam turbine regulating valve to do work and generate power, the steam entering the steam turbine does work, is cooled and depressurized, then is supplied with steam through the steam extraction pipe and the heat supply regulating valve, and the other steam enters the condenser through the high-pressure bypass valve to be condensed.
Preferably, the condenser is connected with a vacuum pump, and the vacuum pump is used for vacuumizing the condenser.
Preferably, the condenser replenishes water through a condensed water replenishing valve.
Preferably, the condensate pump is connected with the steam turbine through a steam exhaust cylinder water injection valve, the steam exhaust cylinder water injection valve is opened when the exhaust temperature of the steam turbine is higher than a preset value, the condensate pump conveys condensate water of the condenser to the steam turbine for water injection and temperature reduction, and the steam exhaust cylinder water injection valve is closed when the exhaust temperature of the steam turbine is lower than the preset value.
Preferably, the system further comprises a condensate recirculation regulating valve which is installed on the condensate recirculation pipeline; one end of the condensed water recycling pipeline is connected with the condenser, and the other end of the condensed water recycling pipeline is connected with a pipeline which is connected with the low-pressure steam drum water level regulating valve and the condensed water heater; when the low-pressure steam pocket does not need to be supplied with water, the condensate recirculation regulating valve is opened, so that the outlet water of the condensate pump enters the condenser through the condensate recirculation pipeline.
Preferably, the system further comprises a water supply recirculation regulating valve, one end of the water supply recirculation regulating valve is connected with a water outlet of the water supply pump, the other end of the water supply recirculation regulating valve is connected with the low-pressure steam drum, and when the high-pressure steam drum does not need to be supplied with water, the water supply recirculation regulating valve is opened to enable the water outlet of the water supply pump to enter the low-pressure steam drum through a pipeline.
Preferably, the water supply pump comprises 2 water supply pumps, namely a first water supply pump and a second water supply pump, and the 2 water supply pumps are operated one by one for standby.
Preferably, the condensate pump comprises 2 condensate pumps, namely a first condensate pump and a second condensate pump, and the first condensate pump is connected with the low-pressure steam drum water level regulating valve through a first condensate pump outlet check valve; the second condensate pump is connected with the low-pressure steam drum water level regulating valve through a second condensate pump outlet check valve; 2 condensate pumps run one by one for standby.
Preferably, the system also comprises a main steam temperature measuring device, a main steam pressure measuring device, a heating steam flow measuring device, a heating steam pressure measuring device and a heating steam temperature measuring device; the main steam temperature measuring device and the main steam pressure measuring device are arranged at an outlet of the high-pressure superheater; the heating steam flow measuring device, the heating steam pressure measuring device and the heating steam temperature measuring device are arranged on the steam extraction pipe behind the heating regulating valve.
The utility model has the advantages that: the steam compensating adjusting valve arranged behind the rotary partition plate is used for compensating steam in the steam turbine cylinder, and the last-stage blade of the steam turbine is cooled due to the increase of steam flow, so that the problem of high-temperature damage of blast air of the last-stage blade caused by the reduction of steam flow after the steam turbine is used for extracting steam and supplying heat by closing the rotary partition plate is solved; when the power of the turbonator is less than 30% of the rated load and the steam supply source is insufficient, the exhaust cylinder of the steam turbine can be sprayed with water by automatically opening the exhaust cylinder water spraying valve, so that the temperature of the last-stage blade of the steam turbine is reduced, and the problem of preventing the last-stage blade of the steam turbine from being damaged is solved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
wherein, 1-a gas turbine generator, 2-an air compressor, 3-a fuel regulating valve, 4-a combustion chamber, 5-a gas turbine, 6-a waste heat boiler, 7-a high-pressure steam drum, 8-a steam turbine, 9-a steam turbine regulating valve, 10-a heat supply regulating valve, 11-a rotating clapboard, 12-a steam turbine generator, 13-a high-pressure bypass valve, 14-a condensed water replenishing valve, 15-a first condensed water pump, 16-a first condensed water pump outlet check valve, 17-a steam exhaust cylinder spray valve, 18-a low-pressure steam drum water level regulating valve, 19-a second condensed water pump outlet check valve, 20-a condensed water recirculation regulating valve, 21-a second condensed water pump, 22-a condenser, 23-a vacuum pump, 24-a low-pressure bypass valve, 25-steam compensation regulating valve, 26-steam compensation check valve, 27-first water supply pump, 28-high pressure steam pocket water level regulating valve, 29-water supply pump recirculation regulating valve, 30-second water supply pump, 31-low pressure steam pocket, 32-condensed water heater, 33-low pressure evaporator, 34-low pressure superheater, 35-water supply heater, 36-high pressure evaporator, 37-high pressure superheater, 38-main steam temperature measuring device, 39-main steam pressure measuring device, 40-heat supply steam flow measuring device, 41-heat supply steam pressure measuring device and 42-heat supply steam temperature measuring device.
Detailed Description
For a better understanding of the present invention, the following further description is made in conjunction with the accompanying drawings and the specific embodiments:
as shown in fig. 1, a distributed combined cycle unit heating system for cooling a last stage blade of a steam turbine includes a gas turbine generator unit, a waste heat boiler 6, a steam turbine generator unit, a low pressure steam drum 31, a high pressure steam drum 7, a condensate pump, a feed pump, a pipeline, and a valve;
the gas turbine generator set comprises a gas turbine generator 1, an air compressor 2 and a gas turbine 5; the gas turbine generator 1, the air compressor 2 and the gas turbine 5 are connected in sequence; the air compressor 2 and the gas turbine 5 are respectively connected with the combustion chamber 4; the combustion chamber 4 is connected with a fuel gas pipeline through a fuel regulating valve 3;
the waste heat boiler 6 comprises a condensed water heater 32, a low-pressure evaporator 33, a low-pressure superheater 34, a feed water heater 35, a high-pressure evaporator 36 and a high-pressure superheater 37;
the steam turbine generator unit comprises a steam turbine 8, a rotary clapboard 11 arranged in the steam turbine 8, a steam turbine generator 12 and a condenser 22; the steam turbine 8 is respectively connected with a turbo generator 12 and a condenser 22; the steam turbine 8 supplies steam to the outside through a heat supply regulating valve 10; the steam turbine 8 drives a coaxial turbine generator 12 to do work and generate electricity; the rotary clapboard 11 adjusts the steam supply pressure of the steam turbine 8 through rotation so as to meet the demand of heat supply steam flow;
the condenser 22 is connected with a condensed water heater 32 through a condensed water pump and a low-pressure steam drum water level regulating valve 18, and the condensed water heater 32, a low-pressure evaporator 33 and a low-pressure superheater 34 are respectively connected with the low-pressure steam drum 31; the condensate pump is used for conveying water condensed by the condenser 22 to the low-pressure steam drum 31 through the condensate heater 32, the water in the low-pressure steam drum 31 is changed into saturated steam through the low-pressure evaporator 33, the saturated steam in the low-pressure steam drum 31 is changed into superheated steam through the low-pressure superheater 34, and the formed superheated steam enters a rear cavity of the rotary partition plate 11 of the steam turbine 8 through the steam supplementing regulating valve 25 and the steam supplementing check valve 26 and is used for realizing steam supplementing cooling of a last-stage blade of the steam turbine 8; when the steam turbine 8 does not operate, opening the low-pressure bypass valve 24 to input the superheated steam at the outlet of the low-pressure superheater 34 into the condenser 22 for cooling, condensing and recycling;
the water supply pump is respectively connected with the low-pressure steam drum 31 and the water supply heater 35; the feed water heater 35, the high-pressure evaporator 36 and the high-pressure superheater 37 are respectively connected with the high-pressure steam drum 7; the feed water pump is used for conveying water of the low-pressure steam drum 31 to the high-pressure steam drum 7 through the feed water heater 35; the water in the high-pressure steam pocket 7 is changed into saturated steam through the high-pressure evaporator 36, the saturated steam in the high-pressure steam pocket 7 is changed into superheated steam through the high-pressure superheater 37, the formed superheated steam enters the steam turbine 8 through the steam turbine regulating valve 9 to do work and generate power, the steam entering the steam turbine 8 does work, is cooled and depressurized, then is supplied with steam through the steam extraction pipe and the heat supply regulating valve 10, and the other steam enters the condenser 22 through the high-pressure bypass valve 13 to be condensed.
The condenser 22 is connected to a vacuum pump 23, and the vacuum pump 23 is used for evacuating the condenser 22. The condenser 22 is replenished with water through the condensed water replenishing valve 14.
The condensate pump is connected with the steam turbine 8 through the exhaust cylinder water spray valve 17, when the exhaust temperature of the steam turbine 8 is higher than a preset value, the exhaust cylinder water spray valve 17 is opened, the condensate pump conveys the condensate water of the condenser 22 to the steam turbine 8 for water spray cooling, and when the exhaust temperature of the steam turbine 8 is lower than the preset value, the exhaust cylinder water spray valve 17 is closed.
The distributed combined cycle unit heating system for cooling the last stage blade of the steam turbine further comprises a condensate recirculation regulating valve 20, wherein the condensate recirculation regulating valve 20 is installed on a condensate recirculation pipeline; one end of the condensed water recirculation pipeline is connected with the condenser 22, and the other end of the condensed water recirculation pipeline is connected with a pipeline connecting the low-pressure steam drum water level regulating valve 18 and the condensed water heater 32; when the low-pressure steam drum 31 does not need to be supplied with water, the condensate recirculation regulating valve 20 is opened, so that the outlet water of the condensate pump enters the condenser 22 through the condensate recirculation pipeline.
The distributed combined cycle unit heating system for cooling the last stage blade of the steam turbine further comprises a water supply recirculation regulating valve 29, one end of the water supply recirculation regulating valve 29 is connected with a water outlet of a water supply pump, the other end of the water supply recirculation regulating valve 29 is connected with a low-pressure steam drum 31, and when the high-pressure steam drum 7 does not need to supply water, the water supply recirculation regulating valve 29 is opened to enable the water outlet of the water supply pump to enter the low-pressure steam drum 31 through a pipeline.
The water supply pump comprises 2 water supply pumps, namely a first water supply pump 27 and a second water supply pump 30, wherein the 2 water supply pumps operate one by one for standby.
The condensate pump comprises 2 condensate pumps, namely a first condensate pump 15 and a second condensate pump 21, wherein the first condensate pump 15 is connected with a low-pressure steam drum water level regulating valve 18 through a first condensate pump outlet check valve 16; the second condensate pump 21 is connected with the low-pressure steam drum water level regulating valve 18 through a second condensate pump outlet check valve 19; 2 condensate pumps run one by one for standby.
The distributed combined cycle unit heat supply system for cooling the last stage blade of the steam turbine further comprises a main steam temperature measuring device 38, a main steam pressure measuring device 39, a heat supply steam flow measuring device 40, a heat supply steam pressure measuring device 41 and a heat supply steam temperature measuring device 42; the main steam temperature measuring device 38 and the main steam pressure measuring device 39 are arranged at the outlet of the high-pressure superheater 37; the heating steam flow measuring device 40, the heating steam pressure measuring device 41 and the heating steam temperature measuring device 42 are arranged on the steam extraction pipe behind the heating regulating valve 10.
The main steam temperature measuring device 38 and the heating steam temperature measuring device 42 include type E thermocouples.
The main steam pressure measuring device 39, the heating steam pressure measuring device 41 and the pressure transmitter comprising EJA series.
The heating steam flow measuring device 40 includes a throttle orifice and an EJA series flow differential pressure transmitter.
The steam turbine regulating valve 9 adopts a hydraulic actuating mechanism; the condensate pump recirculation regulating valve 20 and the feed pump recirculation regulating valve 29 adopt pneumatic regulating valves; the high-pressure bypass valve 13 and the low-pressure bypass valve 24 adopt hydraulic actuating mechanisms, and other regulating valves adopt electric regulating valves; the stop valve is a corrugated pipe stop valve; the check valve adopts a stainless steel horizontal check valve; the first water feeding pump 27 and the second water feeding pump 30 are controlled by frequency converters, the first condensate pump 15 and the second condensate pump 21 are controlled by permanent magnet speed regulation, the output power of a water pump motor is automatically adjusted when the load changes, and the economical efficiency of a power plant is improved.
A6 F.01 type gas turbine is arranged by one-driving-two shafts, a boiler adopts a double-pressure, non-reheating, non-afterburning, horizontal and natural circulation waste heat boiler, a steam turbine adopts a secondary-high pressure, impulse, single-cylinder single-steam-exhaust and adjustable steam-extraction condensing type shaft steam-exhaust turbine, basic parameters of a heat supply steam turbine set are shown in a table 1, parameters of a water feed pump and a motor are shown in a table 2, parameters of a condensate pump and the motor are shown in a table 3, and parameters of a vacuum pump and the motor are shown in a table 4.
TABLE 1 basic parameters of a heat-supplying steam turbine unit
| Parameter(s) | Unit of | Numerical value | |
| Rated | MW | 22 | |
| Main steam pressure (Absolute pressure) | MPa | 5.65 | |
| Temperature of main steam | ℃ | 535 | |
| Highest pressure of steam (a) | MPa | 0.56 | |
| The temperature of steam supply is lower | ℃ | 250 | |
| Steam flow of steam supply | t/h | 8.32 | |
| Maximum extraction of steam | t/h | 55 | |
| Rated adjustable extraction pressure (a) | MPa | 0.9 | |
| Rated adjustable steam extraction temperature | ℃ | 327 | |
| Rated adjustable steam extraction quantity | t/h | 25.7 | |
| Rated exhaust pressure (a) | kPa | 6.8 | |
| Rated exhaust temperature | ℃ | 38.56 | |
| Operating speed | r/min | 3000 |
TABLE 2 Water feed Pump and Motor parameters
TABLE 3 condensate pump and Motor parameters
TABLE 4 vacuum pump and Motor parameters
The utility model discloses a work flow includes following step:
step 1: injecting water into the water side of the waste heat boiler pipe system;
the unit is in a full-shutdown state, water is supplemented to the condenser 22 through the condensed water supplementing valve 14, a condensed water pump and a water feeding pump are sequentially started, the water level of the low-pressure steam drum 31 is automatically controlled to be at a set value through the low-pressure steam drum water level regulating valve 18, the water level of the low-pressure steam drum 31 is ensured to be normal, and the water side of the waste heat boiler 6 pipe system is checked and confirmed to be full of water; when the low-pressure steam drum 31 does not need to be supplied with water, the condensate recirculation regulating valve 20 is opened to enable the outlet water of the condensate pump to enter the condenser 22 through the condensate recirculation pipeline, and the condensate pump is kept to continuously operate; the water level of the high-pressure steam drum 7 is automatically controlled to be at a set value through the high-pressure steam drum water level regulating valve 28, when the high-pressure steam drum 7 does not need to be supplied with water, the water supply recirculation regulating valve 29 is opened to enable the water outlet of the water supply pump to enter the low-pressure steam drum 31 through a pipeline, the water supply pump is kept to continuously operate, two condensate pumps and two water supply pumps are used, and one condensate pump and one water supply pump operate for standby;
step 2: starting a condenser in vacuum;
turning a rotor of the steam turbine 8 to operate, putting circulating water of the condenser 22 into operation, starting the vacuum pump 23 and operating normally, supplying steam by a shaft seal of the steam turbine 8, and establishing vacuum by the condenser 22 to reach a unit starting operation condition;
and step 3: starting a gas turbine;
starting the gas turbine 5, gradually increasing the fuel quantity of the gas turbine 5 by adjusting the fuel regulating valve 3, driving the gas turbine generator 1 to do work by the gas turbine 5, gradually increasing the power generation power, gradually increasing the exhaust flow of the gas turbine 5, increasing the heat receiving capacity of the waste heat boiler 6, and gradually flowing out steam from the outlet of the high-pressure superheater 37; when the steam pressure reaches P0When the steam is condensed and recycled by opening the high-pressure bypass valve 13, the generated steam flows into the condenser 22, and the target value of the steam pressure automatically regulated by the high-pressure bypass valve 13 is set as P0；
And 4, step 4: starting and supplying heat to the steam turbine generator unit;
the outlet steam parameter pressure of the high-pressure superheater 37 reaches P0=1.00MPa and temperature T0When the temperature is not less than 240 ℃, the steam turbine regulating valve 9 is opened, and the steam turbine 8 is rushed to rotate to the rated rotating speed r0When the power of the steam turbine generator 12 reaches 30% rated load along with the increase of the power of the steam turbine 8 and the power of the steam turbine generator 8 reaches 3000r/min, the opening of the rotary partition plate 11 is adjusted, and when the pressure of the steam extraction port of the steam turbine 8 reaches PDrawer 0When the pressure is not less than 0.9MPa, the heat supply regulating valve 10 is opened to supply steam to the outside; the opening degree of the rotary partition plate 11 is adjusted, and the opening degree of the low-pressure bypass valve 24 is adjusted to stabilize the steam supplementing pressure at P0 supplement=0.2MPa, the steam supply regulating valve 25 is opened to supply steam to cool the last stage blade of the steam turbine 8 and apply work to generate power, so that the exhaust temperature T of the exhaust cylinder of the steam turbine 8 is enabledRow boardThe temperature is less than or equal to 80 ℃, and the flexible regulation capacity of the steam supply pressure is realized; when the rate of the turbogenerator 12 is less than 30% of the rated load, the exhaust temperature T of the exhaust cylinder of the steam turbine 8Row board≥TRow 0Automatically opening a water injection valve 17 of the exhaust cylinder after the temperature is not higher than 80 ℃, and ensuring that the exhaust temperature is lower than TRow 1After =65 ℃, the water injection valve 17 of the exhaust cylinder is closed;
and 5: stopping heat supply and unit shutdown;
the heat supply regulating valve 10 is gradually closed until the valve is completely closed, and the partition plate 11 is gradually rotated until the valve is completely opened; gradually closing the fuel regulating valve 3 to reduce the fuel quantity of the gas turbine 5, and gradually reducing the power of the turbonator 12 until the steam turbine regulating valve 9 is close to full closing, and opening a brake of the turbonator unit to be disconnected; the gas turbine 5 is disconnected; the steam turbine 8 and the gas turbine 5 are turned on, and when the exhaust cylinder temperature of the steam turbine 8 satisfies a condition, the vacuum pump 23 of the condenser 22 is stopped, and the feed pump and the condensate pump are stopped.
The present invention is not limited to the above-described embodiments, but only to the preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. A distributed combined cycle unit heating system for cooling last stage blades of a steam turbine is characterized in that: the system comprises a gas turbine generator unit, a waste heat boiler (6), a steam turbine generator unit, a low-pressure steam drum (31), a high-pressure steam drum (7), a condensate pump, a feed pump, a pipeline and a valve;
the gas turbine generator set comprises a gas turbine generator (1), an air compressor (2) and a gas turbine (5); the gas turbine generator (1), the air compressor (2) and the gas turbine (5) are connected in sequence; the air compressor (2) and the gas turbine (5) are respectively connected with the combustion chamber (4); the combustion chamber (4) is connected with a gas pipeline through a fuel regulating valve (3);
the waste heat boiler (6) comprises a condensed water heater (32), a low-pressure evaporator (33), a low-pressure superheater (34), a feed water heater (35), a high-pressure evaporator (36) and a high-pressure superheater (37);
the steam turbine generator unit comprises a steam turbine (8), a rotary clapboard (11), a steam turbine generator (12) and a condenser (22), wherein the rotary clapboard is arranged in the steam turbine (8); the steam turbine (8) is respectively connected with a turbine generator (12) and a condenser (22); the steam turbine (8) supplies steam to the outside through a heat supply regulating valve (10); the steam turbine (8) drives a coaxial turbonator (12) to do work and generate electricity; the rotary clapboard (11) adjusts the steam supply pressure of the steam turbine (8) through rotation so as to meet the demand of heat supply steam flow;
the condenser (22) is connected with a condensed water heater (32) through a condensed water pump and a low-pressure steam drum water level regulating valve (18), and the condensed water heater (32), a low-pressure evaporator (33) and a low-pressure superheater (34) are respectively connected with a low-pressure steam drum (31); the condensate pump is used for conveying water condensed by the condenser (22) to the low-pressure steam drum (31) through the condensate heater (32), the water in the low-pressure steam drum (31) is changed into saturated steam through the low-pressure evaporator (33), the saturated steam in the low-pressure steam drum (31) is changed into superheated steam through the low-pressure superheater (34), and the formed superheated steam enters a rear cavity of a rotary partition plate (11) of the steam turbine (8) through the steam supplementing regulating valve (25) and the steam supplementing check valve (26) and is used for realizing steam supplementing cooling of a last-stage blade of the steam turbine (8); when the steam turbine (8) does not operate, opening a low-pressure bypass valve (24) to input superheated steam at the outlet of the low-pressure superheater (34) into a condenser (22) for cooling, condensing and recycling;
the water feeding pump is respectively connected with the low-pressure steam drum (31) and the water feeding heater (35); the feed water heater (35), the high-pressure evaporator (36) and the high-pressure superheater (37) are respectively connected with the high-pressure steam drum (7); the feed water pump is used for conveying water of the low-pressure steam drum (31) to the high-pressure steam drum (7) through the feed water heater (35); water in the high-pressure steam pocket (7) is changed into saturated steam through the high-pressure evaporator (36), the saturated steam in the high-pressure steam pocket (7) is changed into superheated steam through the high-pressure superheater (37), the formed superheated steam enters the steam turbine (8) through the steam turbine regulating valve (9) to do work and generate power on one way, the steam entering the steam turbine (8) does work, is cooled and depressurized, then is supplied with steam to the outside through the steam extraction pipe and the heat supply regulating valve (10), and the other steam enters the condenser (22) through the high-pressure bypass valve (13) to be condensed.
2. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the condenser (22) is connected with a vacuum pump (23), and the vacuum pump (23) is used for vacuumizing the condenser (22).
3. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: and the condenser (22) is used for supplementing water through a condensed water supplementing valve (14).
4. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the condensate pump is connected with the steam turbine (8) through the exhaust cylinder water injection valve (17), when the exhaust temperature of the steam turbine (8) is higher than a preset value, the exhaust cylinder water injection valve (17) is opened, the condensate pump conveys condensate water of the condenser (22) to the steam turbine (8) for water injection and temperature reduction, and when the exhaust temperature of the steam turbine (8) is lower than the preset value, the exhaust cylinder water injection valve (17) is closed.
5. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the system also comprises a condensate recirculation regulating valve (20), wherein the condensate recirculation regulating valve (20) is installed on the condensate recirculation pipeline; one end of the condensed water recycling pipeline is connected with the condenser (22), and the other end of the condensed water recycling pipeline is connected with a pipeline which is connected with the low-pressure steam drum water level regulating valve (18) and the condensed water heater (32); when the low-pressure steam drum (31) does not need to be supplied with water, the condensate recirculation regulating valve (20) is opened, and the outlet water of the condensate pump enters the condenser (22) through the condensate recirculation pipeline.
6. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the device is characterized by further comprising a water supply recirculation regulating valve (29), wherein one end of the water supply recirculation regulating valve (29) is connected with a water outlet of the water supply pump, the other end of the water supply recirculation regulating valve is connected with the low-pressure steam drum (31), and when the high-pressure steam drum (7) does not need to supply water, the water supply recirculation regulating valve (29) is opened to enable the water outlet of the water supply pump to enter the low-pressure steam drum (31) through a pipeline.
7. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the water supply pump comprises 2 water supply pumps, namely a first water supply pump (27) and a second water supply pump (30), and the 2 water supply pumps operate one by one for standby.
8. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the condensate pump comprises 2 condensate pumps, namely a first condensate pump (15) and a second condensate pump (21), wherein the first condensate pump (15) is connected with a low-pressure steam drum water level regulating valve (18) through a first condensate pump outlet check valve (16); the second condensate pump (21) is connected with the low-pressure steam drum water level regulating valve (18) through a second condensate pump outlet check valve (19); 2 condensate pumps run one by one for standby.
9. The distributed combined cycle plant heating system for cooling last stage blades of a steam turbine according to claim 1, wherein: the system also comprises a main steam temperature measuring device (38), a main steam pressure measuring device (39), a heating steam flow measuring device (40), a heating steam pressure measuring device (41) and a heating steam temperature measuring device (42); the main steam temperature measuring device (38) and the main steam pressure measuring device (39) are arranged at an outlet of the high-pressure superheater (37); the heating steam flow measuring device (40), the heating steam pressure measuring device (41) and the heating steam temperature measuring device (42) are arranged on a steam extraction pipe behind the heating regulating valve (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921378744.1U CN210768939U (en) | 2019-08-23 | 2019-08-23 | Distributed combined cycle unit heat supply system for cooling last-stage blade of steam turbine |
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| CN201921378744.1U CN210768939U (en) | 2019-08-23 | 2019-08-23 | Distributed combined cycle unit heat supply system for cooling last-stage blade of steam turbine |
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| CN210768939U true CN210768939U (en) | 2020-06-16 |
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| CN201921378744.1U Active CN210768939U (en) | 2019-08-23 | 2019-08-23 | Distributed combined cycle unit heat supply system for cooling last-stage blade of steam turbine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110486098A (en) * | 2019-08-23 | 2019-11-22 | 广西电网有限责任公司电力科学研究院 | A kind of the combined cycle unit heating system and method for cooling last stage vane of steam turbine |
| CN112696361A (en) * | 2020-12-03 | 2021-04-23 | 苏州热工研究院有限公司 | Nuclear power plant condensate water speed regulating system |
| CN114251135A (en) * | 2020-09-23 | 2022-03-29 | 上海电气电站设备有限公司 | Low-flow low-load operation method of steam seal system of steam supplementing type steam turbine unit |
| CN114608342A (en) * | 2022-03-16 | 2022-06-10 | 华能北京热电有限责任公司 | Emergent water charging system of condenser |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486098A (en) * | 2019-08-23 | 2019-11-22 | 广西电网有限责任公司电力科学研究院 | A kind of the combined cycle unit heating system and method for cooling last stage vane of steam turbine |
| CN110486098B (en) * | 2019-08-23 | 2021-09-17 | 广西电网有限责任公司电力科学研究院 | Combined cycle unit heat supply system and method for cooling last-stage blade of steam turbine |
| CN114251135A (en) * | 2020-09-23 | 2022-03-29 | 上海电气电站设备有限公司 | Low-flow low-load operation method of steam seal system of steam supplementing type steam turbine unit |
| CN114251135B (en) * | 2020-09-23 | 2024-03-19 | 上海电气电站设备有限公司 | Low-flow low-load operation method of steam seal system of steam supplementing turbine unit |
| CN112696361A (en) * | 2020-12-03 | 2021-04-23 | 苏州热工研究院有限公司 | Nuclear power plant condensate water speed regulating system |
| CN114608342A (en) * | 2022-03-16 | 2022-06-10 | 华能北京热电有限责任公司 | Emergent water charging system of condenser |
| CN114608342B (en) * | 2022-03-16 | 2023-11-07 | 华能北京热电有限责任公司 | Emergent moisturizing system of condenser |
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