CN113431646A - Auxiliary-steam-free isolated thermal state starting method for condensing type external heat supply unit - Google Patents
Auxiliary-steam-free isolated thermal state starting method for condensing type external heat supply unit Download PDFInfo
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- CN113431646A CN113431646A CN202110750655.0A CN202110750655A CN113431646A CN 113431646 A CN113431646 A CN 113431646A CN 202110750655 A CN202110750655 A CN 202110750655A CN 113431646 A CN113431646 A CN 113431646A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
Abstract
The invention discloses an isolated thermal state starting method of a condensing type external heat supply unit without auxiliary steam, which comprises the following steps: after the unit trips, unit equipment is checked, and an auxiliary steam source of the unit is switched; the invention fully utilizes the pressurized steam of the pipeline after the unit is transformed for external heat supply, the steam pressure and the temperature are very close to the parameters of the starting steam, the system has simple structure, the back-and-forth switching process of the system is stable, the time is short, compared with the traditional operation of controlling the pressure and the temperature according to the high side, the fluctuation of the auxiliary steam pressure caused by the attention on the high side back temperature is not needed, the time is saved in the operation, and the operation difficulty is reduced; the steam storage capacity of the external heat supply pipeline is large, the steam demand for starting the unit can be met, the stability of steam supply is ensured, the steam for the shaft seal and the heating of the deaerator can be synchronously input, and the metal thermal shock of the unit is reduced; the shaft seal pressure is more stable, the rotating speed of the steam pump is easy to control, the heating effect of the plasma hot air heater is good, the whole process is low, the plasma hot air heater can be normally adjusted, and the phenomenon of dry burning of a reheater is avoided.
Description
Technical Field
The invention relates to the technical field of single machine thermal state starting of power plants, in particular to an isolated thermal state starting method of a condensing type external heat supply unit without auxiliary steam.
Background
At present, two units of a power plant are started by adopting equipment configured by unit units for starting operation, and since the production of 2008, auxiliary steam used for starting the units mainly comes from a starting boiler, machine-approaching steam and cold re-steam of the unit, the auxiliary steam pressure is 0.8-1.2 MPa (a), and the temperature is 260-360 ℃. After the single machine is operated and tripped, the hot-state starting steam is mainly used for starting a boiler or a unit to adjust cold re-steam pressure by using a high-pressure and low-pressure bypass, and auxiliary steam is supplied by cold re-steam, so that the processes of operating a shaft seal of a steam turbine, flushing and rotating a steam pump set, heating a deaerator and heating a plasma hot air heater are realized.
The problem that ignition is difficult exists when the existing unit is started after tripping; the method for regulating cold vapor pressure by using a high-pressure bypass and a low-pressure bypass to supply auxiliary steam to a comparison unit has the advantages that the unit needs to be decompressed and pressurized after tripping, the auxiliary steam pressure is provided by intermittently starting the high bypass to meet the steam using parameter requirement due to the fact that the steam after the high bypass has no temperature reduction water, and the temperature after the high bypass must be paid attention to;
however, the steam quantity provided by the method is not long in maintaining time, the auxiliary steam pressure changes greatly, the shaft seal pressure and the steam pump rotating speed are unstable to control, the steam consumption for heating the deaerator is large, the deaerator cannot be used, the plasma hot air heater is not ideal in heating effect, and the requirement on the operation level of operators is high; in order to control cold-reheat pressure and low side-by-side total shutdown, a reheater is in a short dry-burning state during starting, and therefore an isolated thermal-state starting method of a condensing type external heat supply unit without auxiliary steam is provided to solve the problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an isolated thermal state starting method of a condensing type external heat supply unit without auxiliary steam.
In order to achieve the purpose, the invention adopts the following technical scheme:
a condensing type external heat supply unit isolated thermal state starting method without auxiliary steam is characterized by comprising the following steps:
after the unit trips, checking unit equipment, and switching an auxiliary steam source of the unit;
checking the operation condition of a steam turbine shaft seal system, and selectively opening or closing all drainage pipes leading to a condenser according to whether the pressure of an auxiliary steam header is stable;
feeding water to the boiler, and slowly feeding water to the boiler according to the ignition preparation condition of the boiler after the shaft seal and vacuum of the unit are normal;
igniting the boiler, starting a feed fan and a draught fan to sweep the boiler, starting a primary fan and a sealing fan after sweeping is finished, and selecting whether to put a plasma hot air heater according to the temperature of hot air;
when the boiler water is near the saturation temperature, adjusting the water supply state of the boiler, switching the auxiliary steam source after the pressure and the temperature of the boiler rise, and timely throwing an air preheater to continuously blow the soot;
flushing oxide skins according to the quality of the steam-water;
arranging a steam turbine to carry out impulse rotation, and strengthening the temperature adjustment of main reheat steam in the process of impulse rotation; monitoring of TSI parameters of the large engine is enhanced, medium-speed warming is not needed during extremely hot starting, the speed is directly increased to 2900rpm after friction inspection at 400rpm, and the operation unit is connected with the power, the state is changed, the steam pump is connected, the load is increased and AGC is put into operation at 3000 rpm.
Preferably, the step 1 comprises: after the unit trips, checking that tripping protection actions of mechanical, electric and furnace equipment are normal, and normally switching the service power, otherwise, processing according to total loss of the service power;
checking the hot reram of unit, cold reram, four sections steam extraction heat supply motor-operated gate and the chain of check valve are closed, user's unit heat supply is interrupted, start one-level emergency plan, check heat supply user is closed with vapour motor-operated gate in the stipulated time, make external heat supply pipeline pressurize, close the unnecessary user of trip unit auxiliary steam header and drain, will assist other steam sources of steam header to cut off, input heat supply to auxiliary steam with, the warm braw of paying attention to in-process, prevent pipeline vibration, it is stable about 0.7MPa to control auxiliary steam pressure with heat supply to auxiliary steam with vapour motor-operated gate throttle control.
Preferably, the step 2 includes: checking the operation condition of a steam turbine shaft seal system, monitoring the pressure of a main shaft seal pipe, closing a shaft seal overflow regulating valve and a bypass electric door in time, closing all drainage water of a condenser, immediately breaking vacuum, and preventing the shaft seal pressure from being incapable of maintaining;
after the pressure of the auxiliary steam header is stable, putting the auxiliary steam header into the shaft seal system again, fully draining water, properly increasing the shaft seal pressure to 40-50 kPa due to the fact that the temperature of the large machine cylinder is high at the moment, increasing the temperature of the shaft seal of the low pressure cylinder to 180 ℃, enabling the shaft seal system to work stably, carefully checking whether the temperature of each tile shaft seal is normal, and after vacuumizing, paying attention to checking whether the tile shaft seal has a gas suction phenomenon and paying attention to the temperature and the eccentric change of the large machine cylinder; opening a drainage manual door of a steam turbine cylinder body and drainage manual doors of steam extraction pipelines at all sections; during the starting process, the TSI parameters of the large engine are monitored to be normal, in particular the temperature difference between an upper cylinder and a lower cylinder and the expansion difference between a high pressure cylinder and a medium pressure cylinder.
Preferably, the step 3 comprises: after the shaft seal and the vacuum of the unit are normal, according to the ignition preparation condition of a boiler, a small machine is timely flushed and rotated, the deaerator is put into heating, the temperature rise of the deaerator is noticed, when the front pressure of a main water supply electric door of the boiler is higher than the pressure behind the door by more than 0.5MPa, a water supply bypass electric regulating door is opened, the boiler is slowly supplied with water, at the moment, whether the temperature drop rate of an inlet of the economizer is smaller than 2 ℃/min or not is particularly noticed, when the water level of a water storage tank of a steam-water separator of the boiler is about 6m, a circulating pump of the boiler is started, the opening degree of an outlet of the circulating pump of the boiler is opened as much as possible, the circulating flow is increased, and the water supply flow rate of the inlet of the economizer is ensured.
Preferably, the step 4 comprises: starting a draught fan and a delivery fan to purge the boiler, selecting a mill which does not run before MFT occurs after purging is finished to establish a primary fan channel, and starting the primary fan and a sealing fan; if the temperature of the secondary hot air is higher than 160 ℃, the plasma hot air heater can be not put into operation, and if the temperature of the secondary hot air is lower than 160 ℃, the plasma hot air heater is put into operation.
Preferably, the step 5 comprises: when the boiler water is near the saturation temperature, the water storage tank of the steam-water separator is easy to generate false water level, is changed violently and is not easy to control, and the boiler water supply is adjusted accurately in time to prevent the boiler circulating pump from tripping or the boiler superheater from passing water;
after the pressure and the temperature of the boiler rise again, slowly opening a low-pressure bypass, simultaneously opening a large high-pressure bypass, keeping the pressure of a reheater stable, opening drainage electric doors of a main steam pipeline and a reheated steam pipeline, checking a side drainage manual door and measuring the temperature, checking that drainage of a unit is smooth, and increasing the temperature of main reheated steam to 480-500 ℃ in order to prevent negative temperature difference starting; after the pressure is built again, the steam supply of the auxiliary steam header is switched from the heat supply steam to cold and then steam supply, the auxiliary steam is opened to the manual soot blowing door of the air preheater, and the air preheater is put into the air preheater to continuously blow soot in time.
Preferably, the step 6 comprises: the method comprises the steps of flushing oxide skins according to the quality condition of steam and water, particularly paying attention to monitoring the automatic adjustment condition of the high-pressure bypass desuperheating water, ensuring that the cold is provided with auxiliary steam again, ensuring that important equipment such as an auxiliary steam belt shaft seal, a small machine and a deaerator stably run, and controlling the temperature of 280-350 ℃ and the pressure of 0.8-1 MPa after the high-pressure bypass is controlled in the whole process until the high-pressure bypass is completely closed after a unit is connected to the grid.
Preferably, the step 7 includes: when a steam turbine is in impact rotation, the pressure of main steam is 5-6 MPa, the temperature of the main steam and reheated steam is 500 ℃, the main steam and reheated steam are randomly put into a high-low pressure heater after the impact rotation is started, and because the pressure of the cold recompression is higher at the moment, the two-stage steam extraction is slowly opened, and the two-stage steam extraction electric door is kept at a smaller opening; in the process of impact rotation, the temperature adjustment of main reheating steam is enhanced, the steam temperature can only rise but not be allowed to fall, the temperature rise rate of 0.5-1.5 ℃/min is ensured, and water impact is prevented; and the monitoring of the TSI parameters of the large machine is enhanced, medium-speed warm-up is not needed during the extremely hot state starting, the speed is directly increased to 2900rpm after the friction inspection at 400rpm, and the operation unit is connected with the grid, the state is changed, the steam pump is connected with the grid, the load is increased and AGC is put into operation at the rotating speed of 3000 rpm.
Preferably, when the plasma hot air heater is put into operation, the operation is slow, and the influence of the pressure change of the auxiliary steam header on the steam supply of the shaft seal and the operation of the small machine is noticed; starting the plasma C-mill, arc drawing and ventilation operation of the powder pipes one by one, and properly increasing the coal feeding amount to raise the temperature of the smoke at the outlet of the hearth to be higher than the wall temperature of the superheater as soon as possible after the C-mill operates normally.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention fully utilizes the pressurized steam of the pipeline after the unit is transformed for external heat supply, the steam pressure and the temperature are very close to the parameters of the starting steam, the system has simple structure, the back-and-forth switching process of the system is stable, the time is short, compared with the traditional operation of controlling the pressure and the temperature according to the high side, the invention does not need to cause the fluctuation of the auxiliary steam pressure because of paying attention to the high side back temperature, the time is saved in the operation of the invention, and the operation difficulty is reduced.
2. The steam supply device has large steam storage capacity of an external heat supply pipeline, can meet the steam demand for starting the unit, ensures the stability of steam supply, and reduces metal thermal shock of the unit because the steam for the shaft seal and the heating of the deaerator can be synchronously input.
3. By adopting the invention, the shaft seal pressure is more stable, the rotating speed of the air pump is easy to control, the heating effect of the warm air blower is good,
4. the whole process can be normally adjusted at the low side, so that the phenomenon of dry burning of the reheater is avoided.
5. The method provided by the invention can meet the requirements of stable auxiliary steam supply for 2 more than 2 hours during the hot-state starting of the single unit, the starting time requirement of the unit is met, and the whole system is stable in starting process switching, safe and reliable.
Drawings
FIG. 1 is a schematic flow chart of a method for an isolated thermal-state startup method of a condensing-type external heat supply unit without auxiliary steam according to the present invention;
fig. 2 is a layout diagram of a unit auxiliary steam header system of the isolated thermal-state starting method for a condensing type external heat supply unit without auxiliary steam, which is provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, a condensing type external heating unit isolated thermal state starting method without auxiliary steam includes the following steps:
step 1: after the unit trips, checking that tripping protection actions of mechanical, electric and furnace equipment are normal, and normally switching the service power, otherwise, processing according to total loss of the service power;
checking the linkage closing of a hot re-steam, a cold re-steam, a four-section steam extraction and heat supply electric door and a check valve of a unit, interrupting the heat supply of a user unit, starting a first-level emergency plan, checking the closing of the steam consumption electric door of a heat supply user within a specified time, maintaining the pressure of an external heat supply pipeline, closing redundant users and drainage of an auxiliary steam header of a tripping unit, cutting off other steam sources of the auxiliary steam header, inputting heat supply to the auxiliary steam consumption, paying attention to drainage of a heating pipe in the inputting process, preventing the pipeline from vibrating, and controlling the auxiliary steam pressure to be stable at about 0.7MPa by using a throttle of the steam consumption electric door for supplying heat to the auxiliary steam;
step 2: checking the operation condition of a steam turbine shaft seal system, monitoring the pressure of a main shaft seal pipe, closing a shaft seal overflow regulating valve and a bypass electric door in time, closing all drainage water of a condenser, immediately breaking vacuum, and preventing the shaft seal pressure from being incapable of maintaining;
after the pressure of the auxiliary steam header is stable, putting the auxiliary steam header into the shaft seal system again, fully draining water, properly increasing the shaft seal pressure to 40-50 kPa due to the fact that the temperature of the large machine cylinder is high at the moment, increasing the temperature of the shaft seal of the low pressure cylinder to 180 ℃, enabling the shaft seal system to work stably, carefully checking whether the temperature of each tile shaft seal is normal, and after vacuumizing, paying attention to checking whether the tile shaft seal has a gas suction phenomenon and paying attention to the temperature and the eccentric change of the large machine cylinder; opening a drainage manual door of a steam turbine cylinder body and drainage manual doors of steam extraction pipelines at all sections; in the starting process, the TSI parameters of the large engine are monitored to be normal, particularly the temperature difference between an upper cylinder and a lower cylinder and the expansion difference between a high pressure cylinder and a medium pressure cylinder;
and step 3: when water is fed to a boiler, a small machine is timely turned according to the ignition preparation condition of the boiler after shaft seal and vacuum of a unit are normal, the deaerator is put into the boiler for heating, the temperature rise of the deaerator is noticed, when the front pressure of a main water supply electric door of the boiler is higher than the pressure behind the door by more than 0.5MPa, a water feeding bypass electric regulating door is opened, the boiler is slowly fed with water, at the moment, whether the temperature drop rate of an inlet of an economizer is less than 2 ℃/min or not is particularly noticed, when the water level of a water storage tank of a steam-water separator of the boiler is about 6m, a circulating pump of the boiler is started, the opening degree of an outlet regulating door of the circulating pump of the boiler is opened to the greatest extent, the circulating flow is increased, and the water feeding flow rate of the inlet of the economizer is ensured;
and 4, step 4: when the boiler is ignited, starting a draught fan and a delivery fan to purge the boiler, selecting a mill which does not run before MFT occurs after purging is completed to establish a primary fan channel, and starting the primary fan and a sealing fan; if the temperature of the secondary hot air is higher than 160 ℃, the plasma hot air heater can be not put into operation, if the temperature of the secondary hot air is lower than 160 ℃, the plasma hot air heater is required to be put into operation, the operation is slow when the plasma hot air heater is put into operation, and the influence of the pressure change of the auxiliary steam header on the steam supply of the shaft seal and the operation of a small machine is noticed; starting a plasma C mill, wherein powder pipes are sequentially subjected to arc discharge and then ventilation operation, and after a C coal mill normally operates, the coal supply amount is properly increased, so that the temperature of smoke at the outlet of a hearth is increased to be higher than the wall temperature of a superheater as soon as possible; if the combustion load of one coal mill is insufficient, and the main and reheat steam pressures and temperatures still drop rapidly, a second coal mill is started to operate;
and 5: when the boiler water is near the saturation temperature, the water storage tank of the steam-water separator is easy to generate false water level, is changed violently and is not easy to control, and the boiler water supply is adjusted accurately in time to prevent the boiler circulating pump from tripping or the boiler superheater from passing water;
after the pressure and the temperature of the boiler rise again, slowly opening a low-pressure bypass, simultaneously opening a large high-pressure bypass, keeping the pressure of a reheater stable, opening drainage electric doors of a main steam pipeline and a reheated steam pipeline, checking a side drainage manual door and measuring the temperature, checking that drainage of a unit is smooth, and increasing the temperature of main reheated steam to 480-500 ℃ in order to prevent negative temperature difference starting; after pressure is built again in cold, steam supply of the auxiliary steam header is switched from heat supply steam to cold supply steam again, auxiliary steam is opened to a manual soot blowing door of the air preheater, and the air preheater is put into the air preheater to continuously blow soot in time;
step 6: flushing oxide skins according to the quality condition of steam and water, particularly paying attention to monitoring the automatic adjustment condition of the high-pressure bypass desuperheating water, ensuring that the cold and hot water carry auxiliary steam, the auxiliary steam carries important equipment such as a shaft seal, a small machine and a deaerator to stably run, and controlling the temperature of 280-350 ℃ and the pressure of 0.8-1 MPa after the high-pressure bypass is controlled in the whole process until the high-pressure bypass is completely closed after the machine set is connected to the grid;
and 7: arranging a steam turbine to carry out impulse rotation, wherein when the steam turbine carries out impulse rotation, the pressure of main steam is 5-6 MPa, the temperature of the main steam and the reheated steam is 500 ℃, and after the impulse rotation is started, randomly putting the main steam and the reheated steam into a high-low pressure heater, and keeping a second-stage steam extraction electric door at a smaller opening degree because the pressure of the cold re-pressing is higher at the moment and the second-stage steam extraction should be slowly opened; in the process of impact rotation, the temperature adjustment of main reheating steam is enhanced, the steam temperature can only rise but not be allowed to fall, the temperature rise rate of 0.5-1.5 ℃/min is ensured, and water impact is prevented; and the monitoring of the TSI parameters of the large machine is enhanced, medium-speed warm-up is not needed during the extremely hot state starting, the speed is directly increased to 2900rpm after the friction inspection at 400rpm, and the operation unit is connected with the grid, the state is changed, the steam pump is connected with the grid, the load is increased and AGC is put into operation at the rotating speed of 3000 rpm.
In the description of the present invention, it is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A condensing type external heat supply unit isolated thermal state starting method without auxiliary steam is characterized by comprising the following steps:
after the unit trips, checking unit equipment, and switching an auxiliary steam source of the unit;
checking the operation condition of a steam turbine shaft seal system, and selectively opening or closing all drainage pipes leading to a condenser according to whether the pressure of an auxiliary steam header is stable;
feeding water to the boiler, and slowly feeding water to the boiler according to the ignition preparation condition of the boiler after the shaft seal and vacuum of the unit are normal;
igniting the boiler, starting a feed fan and a draught fan to sweep the boiler, starting a primary fan and a sealing fan after sweeping is finished, and selecting whether to put a plasma hot air heater according to the temperature of hot air;
when the boiler water is near the saturation temperature, adjusting the water supply state of the boiler, switching the auxiliary steam source after the pressure and the temperature of the boiler rise, and timely throwing an air preheater to continuously blow the soot;
flushing oxide skins according to the quality of the steam-water;
arranging a steam turbine to carry out impulse rotation, and strengthening the temperature adjustment of main reheat steam in the process of impulse rotation; monitoring of TSI parameters of the large engine is enhanced, medium-speed warming is not needed during extremely hot starting, the speed is directly increased to 2900rpm after friction inspection at 400rpm, and the operation unit is connected with the power, the state is changed, the steam pump is connected, the load is increased and AGC is put into operation at 3000 rpm.
2. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 1 comprises the following steps: after the unit trips, checking that tripping protection actions of mechanical, electric and furnace equipment are normal, and normally switching the service power, otherwise, processing according to total loss of the service power;
checking the hot reram of unit, cold reram, four sections steam extraction heat supply motor-operated gate and the chain of check valve are closed, user's unit heat supply is interrupted, start one-level emergency plan, check heat supply user is closed with vapour motor-operated gate in the stipulated time, make external heat supply pipeline pressurize, close the unnecessary user of trip unit auxiliary steam header and drain, will assist other steam sources of steam header to cut off, input heat supply to auxiliary steam with, the warm braw of paying attention to in-process, prevent pipeline vibration, it is stable about 0.7MPa to control auxiliary steam pressure with heat supply to auxiliary steam with vapour motor-operated gate throttle control.
3. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 2 comprises the following steps: checking the operation condition of a steam turbine shaft seal system, monitoring the pressure of a main shaft seal pipe, closing a shaft seal overflow regulating valve and a bypass electric door in time, closing all drainage water of a condenser, immediately breaking vacuum, and preventing the shaft seal pressure from being incapable of maintaining;
after the pressure of the auxiliary steam header is stable, putting the auxiliary steam header into the shaft seal system again, fully draining water, properly increasing the shaft seal pressure to 40-50 kPa due to the fact that the temperature of the large machine cylinder is high at the moment, increasing the temperature of the shaft seal of the low pressure cylinder to 180 ℃, enabling the shaft seal system to work stably, carefully checking whether the temperature of each tile shaft seal is normal, and after vacuumizing, paying attention to checking whether the tile shaft seal has a gas suction phenomenon and paying attention to the temperature and the eccentric change of the large machine cylinder; opening a drainage manual door of a steam turbine cylinder body and drainage manual doors of steam extraction pipelines at all sections; during the starting process, the TSI parameters of the large engine are monitored to be normal, in particular the temperature difference between an upper cylinder and a lower cylinder and the expansion difference between a high pressure cylinder and a medium pressure cylinder.
4. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 3 comprises the following steps: after the shaft seal and the vacuum of the unit are normal, according to the ignition preparation condition of a boiler, a small machine is timely flushed and rotated, the deaerator is put into heating, the temperature rise of the deaerator is noticed, when the front pressure of a main water supply electric door of the boiler is higher than the pressure behind the door by more than 0.5MPa, a water supply bypass electric regulating door is opened, the boiler is slowly supplied with water, at the moment, whether the temperature drop rate of an inlet of the economizer is smaller than 2 ℃/min or not is particularly noticed, when the water level of a water storage tank of a steam-water separator of the boiler is about 6m, a circulating pump of the boiler is started, the opening degree of an outlet of the circulating pump of the boiler is opened as much as possible, the circulating flow is increased, and the water supply flow rate of the inlet of the economizer is ensured.
5. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 4 comprises the following steps: starting a draught fan and a delivery fan to purge the boiler, selecting a mill which does not run before MFT occurs after purging is finished to establish a primary fan channel, and starting the primary fan and a sealing fan; if the temperature of the secondary hot air is higher than 160 ℃, the plasma hot air heater can be not put into operation, and if the temperature of the secondary hot air is lower than 160 ℃, the plasma hot air heater is put into operation.
6. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 5 comprises the following steps: when the boiler water is near the saturation temperature, the water storage tank of the steam-water separator is easy to generate false water level, is changed violently and is not easy to control, and the boiler water supply is adjusted accurately in time to prevent the boiler circulating pump from tripping or the boiler superheater from passing water;
after the pressure and the temperature of the boiler rise again, slowly opening a low-pressure bypass, simultaneously opening a large high-pressure bypass, keeping the pressure of a reheater stable, opening drainage electric doors of a main steam pipeline and a reheated steam pipeline, checking a side drainage manual door and measuring the temperature, checking that drainage of a unit is smooth, and increasing the temperature of main reheated steam to 480-500 ℃ in order to prevent negative temperature difference starting; after the pressure is built again, the steam supply of the auxiliary steam header is switched from the heat supply steam to cold and then steam supply, the auxiliary steam is opened to the manual soot blowing door of the air preheater, and the air preheater is put into the air preheater to continuously blow soot in time.
7. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 6 comprises the following steps: the method comprises the steps of flushing oxide skins according to the quality condition of steam and water, particularly paying attention to monitoring the automatic adjustment condition of the high-pressure bypass desuperheating water, ensuring that the cold is provided with auxiliary steam again, ensuring that important equipment such as an auxiliary steam belt shaft seal, a small machine and a deaerator stably run, and controlling the temperature of 280-350 ℃ and the pressure of 0.8-1 MPa after the high-pressure bypass is controlled in the whole process until the high-pressure bypass is completely closed after a unit is connected to the grid.
8. The isolated thermal-state starting method of the condensing type external heating unit without auxiliary steam according to claim 1, wherein the step 7 comprises the following steps: when a steam turbine is in impact rotation, the pressure of main steam is 5-6 MPa, the temperature of the main steam and reheated steam is 500 ℃, the main steam and reheated steam are randomly put into a high-low pressure heater after the impact rotation is started, and because the pressure of the cold recompression is higher at the moment, the two-stage steam extraction is slowly opened, and the two-stage steam extraction electric door is kept at a smaller opening; in the process of impact rotation, the temperature adjustment of main reheating steam is enhanced, the steam temperature can only rise but not be allowed to fall, the temperature rise rate of 0.5-1.5 ℃/min is ensured, and water impact is prevented; and the monitoring of the TSI parameters of the large machine is enhanced, medium-speed warm-up is not needed during the extremely hot state starting, the speed is directly increased to 2900rpm after the friction inspection at 400rpm, and the operation unit is connected with the grid, the state is changed, the steam pump is connected with the grid, the load is increased and AGC is put into operation at the rotating speed of 3000 rpm.
9. The isolated thermal state starting method of claim 5, wherein the operation is slow when the plasma hot air heater is put into operation, and the influence of the pressure change of the auxiliary steam header on the steam supply of the shaft seal and the operation of the small machine is noticed; starting the plasma C-mill, arc drawing and ventilation operation of the powder pipes one by one, and properly increasing the coal feeding amount to raise the temperature of the smoke at the outlet of the hearth to be higher than the wall temperature of the superheater as soon as possible after the C-mill operates normally.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114934828A (en) * | 2022-05-13 | 2022-08-23 | 华电电力科学研究院有限公司 | Operation method based on supercritical reheating type double-extraction heat supply backpressure unit system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114575943A (en) * | 2022-03-30 | 2022-06-03 | 西安热工研究院有限公司 | Control system and method for shaft seal electric heater of shaft seal system of ultra-supercritical unit |
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| CN114941552A (en) * | 2022-05-13 | 2022-08-26 | 华电电力科学研究院有限公司 | Shutdown non-shutdown heat supply rapid switching control method based on large supercritical reheating type double-extraction back pressure unit |
| CN114941552B (en) * | 2022-05-13 | 2023-05-23 | 华电电力科学研究院有限公司 | Large supercritical reheating type double-pumping back pressure unit-based rapid switching control method for heat supply without stopping furnace when shutdown |
| CN114934828B (en) * | 2022-05-13 | 2023-08-22 | 华电电力科学研究院有限公司 | Method for putting supercritical reheating type double-pumping heat supply back pressure unit system into operation |
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