CN117704448A - Heat supply transformation system and method for deep peak regulation and low steam introduction of small engine for steam inlet, temperature reduction and pressure reduction - Google Patents
Heat supply transformation system and method for deep peak regulation and low steam introduction of small engine for steam inlet, temperature reduction and pressure reduction Download PDFInfo
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Abstract
The invention provides a heat supply reconstruction system for deep peak regulation and down-draft turbine steam inlet temperature and pressure reduction, which comprises: an ultrahigh pressure steam exhaust pipeline unit and a steam inlet pipeline unit of a steam guiding small machine; and a heat supply main pipe unit for reducing temperature and pressure by steam inlet of a steam guiding small machine, which comprises: the ultrahigh pressure steam is discharged to a boiler reheater pipeline and is connected with a steam inlet pipeline of a steam removal small-sized engine through a tee joint; the steam inlet pipeline of the steam guiding small machine is connected with a temperature and pressure reducing branch pipe through a tee joint in front of the valve group; and (5) introducing steam into the steam guiding small machine, reducing temperature and pressure, and then removing the heat supply main pipe unit. The invention can ensure the normal operation of the steam guiding small machine under the normal working condition, and can directly supply heat to the outside by utilizing the steam inlet, the temperature reduction and the pressure reduction of the steam guiding small machine under the deep regulating working condition, thereby solving the problem of low heat supply parameters of the steam guiding and discharging under the deep peak regulation and realizing the decoupling of the thermoelectric load.
Description
Technical Field
The invention belongs to the field of heat engines of power plants, and particularly relates to a heat supply transformation system for deep peak regulation and low steam admission, temperature reduction and pressure reduction of a small steam guiding machine.
Background
The power industry, in particular to a coal motor group, is a large household of coal consumption, is a double-carbon target of '3060' of the whole country of assistance, improves the energy utilization efficiency, promotes clean low-carbon transformation in the power industry, and urgently needs energy-saving transformation, flexibility transformation and heat supply transformation, namely three-change linkage, of the existing unit.
Because the power load changes in different magnitudes at any time, the generator set needs to carry out peak shaving at any time according to the national network schedule. In general, the electric load and the thermal load of the unit are in strong coupling relation, when the electric power of the unit is high, the heat supply quantity is increased, and under the working condition of 50% THA and below, the heat supply capacity of the unit is reduced. Meanwhile, when the peak of the unit is regulated to a load below 50%, all parameters of the unit are lower than the design working condition, and the steam exhaust parameters of the steam guiding small machine cannot meet the requirements of heat users, so that the steam needs to be switched to a temperature and pressure reducing pipeline, and enters a heat supply main pipe after passing through a temperature and pressure reducer, and the stability of external heat supply is ensured.
Disclosure of Invention
The invention aims to provide a heat supply transformation system for reducing temperature and pressure of steam inlet of a steam-guiding small machine under deep peak regulation, which is used for switching the steam inlet of a steam-guiding small machine to a temperature and pressure reduction pipeline when 50% THA of a unit and lower deep regulation working conditions are adopted, so that safe operation of the unit under deep regulation working conditions can be ensured, and the problems of insufficient heat supply and low heat supply parameters under the deep regulation working conditions of the unit can be solved by utilizing the steam inlet of the steam-guiding small machine to reduce temperature and pressure for external heat supply, thereby realizing decoupling of electric and thermal loads of the unit, realizing that the power generation load and the borne heat supply load of a thermoelectric unit are not influenced mutually, and meeting the requirements of flexible peak regulation of the unit depth.
A heat supply transformation system for deep peak regulation and down-draft turbine steam inlet temperature and pressure reduction comprises:
an ultrahigh pressure steam exhaust pipeline unit and a steam inlet pipeline unit of a steam guiding small machine;
and a heat supply main pipe unit for reducing temperature and pressure of steam inlet of the steam guiding small machine, which is communicated with the steam inlet pipeline unit of the steam guiding small machine, and comprises:
a steam-guiding small-machine steam-inlet temperature-reducing and pressure-reducing main pipe 300 is provided with a first electric gate valve 301, a first check valve 302, a second electric gate valve 303, a temperature-reducing and pressure-reducing device 304 and a safety valve 305 in sequence;
wherein, the first electric gate valve 301 is arranged near the steam inlet pipeline 200 of the steam guiding small machine;
the temperature and pressure reducer 304 is connected with a temperature and pressure reducing valve and then is connected with a heat supply main pipe pipeline 310 and a temperature and pressure reducing water pipeline 320;
the temperature and pressure reducing valve is followed by a heat supply main pipe pipeline 310 which is communicated with the heat supply main pipe;
the output end of the temperature-reducing water pipe 320 is connected with the temperature-reducing pressure reducer 304.
Preferably, a flowmeter 311 and a third electric gate valve 312 are sequentially arranged on the heat supply main pipe pipeline 310 behind the temperature and pressure reducing valve; the flowmeter 311 is disposed near the temperature and pressure reducer 304.
Preferably, the first stop valve 321, the second stop valve 322, the filter screen 323, the electric stop valve 324, the electric regulating valve 325, the third stop valve 326 and the second check valve 327 are sequentially arranged on the temperature reducing water pipe 320.
Preferably, the steam guiding small machine steam inlet pipeline unit comprises:
a steam inlet pipeline 200 of the steam guiding small machine;
the small turbine inlet bypass pipeline 210 is communicated with the small turbine inlet pipeline 200.
Preferably, the steam inlet pipeline 200 of the steam guiding small machine is provided with an electric gate valve 201 and a check valve 202 in sequence.
Preferably, the steam inlet bypass pipeline 210 of the steam guiding small machine is provided with a gate valve 211, an electric regulating valve 212 and an electric gate valve 213 in sequence.
Preferably, the ultra-high pressure exhaust steam pipe unit includes:
the ultrahigh pressure steam exhaust pipeline 100 is communicated with an ultrahigh pressure cylinder of the steam turbine, and the other end of the ultrahigh pressure steam exhaust pipeline is communicated with a high-temperature reheater of the boiler.
Preferably, the heat supply quantity of the steam inlet temperature and pressure reducing pipeline unit of the steam guiding small machine is 130t/h.
The heat supply transformation method for the steam inlet, temperature reduction and pressure reduction of the deep peak regulation lower steam guiding small machine is characterized by comprising the step of switching the steam inlet of the steam guiding small machine to a temperature reduction and pressure reduction pipeline before a valve group, and specifically comprising the following steps of:
step one, starting a first electric gate valve 301 and a second electric gate valve 303, synchronously starting a third electric gate valve 312, and starting an electric stop valve 324 after the first electric gate valve and the second electric gate valve are in place;
step two, synchronously closing the electric gate valve 201, the electric regulating valve 212 and the electric gate valve 213; the steam inlet of the steam-removing small-sized guiding machine is switched into a temperature-removing and pressure-reducing pipeline;
step three, after each valve is in place, opening the electric regulating valve 325 and setting the opening to a certain value, and setting the opening of the pressure regulating valve of the temperature and pressure reducer to a certain value;
step four, the pressure regulating valve of the temperature and pressure reducer 304 is set to be automatic, and the outlet pressure of the temperature and pressure reducer 304 is tracked; the electrically operated regulator valve 325 is set to be automatic, tracking the outlet temperature of the desuperheater and reducer 304.
Compared with the prior art, the invention has the advantages that:
1. the unit is simple in modification and arrangement, small in occupied space, mature and reliable in equipment and relatively large in heat supply adjustable range;
2. when the working condition of the unit is below 50% THA, the steam inlet of the steam-removing small-introduction machine is switched to a temperature-reducing and pressure-reducing pipeline, so that the normal operation of the unit under the deep-adjustment working condition can be ensured, and the heat can be supplied to the outside after the temperature reduction and pressure reduction of the steam-introducing small-introduction machine, thereby solving the problems of insufficient heat supply quantity and low heat supply parameter of the unit under the deep peak regulation and realizing the decoupling of the electric and heat loads of the unit;
3. because the steam inlet of the steam guiding small machine is directly switched to the temperature and pressure reducing pipeline under the deep regulating working condition, the system response is quick, and the stability and the safety of the heat supply network are facilitated;
4. and the enthalpy loss and working medium loss caused by direct discharge of the exhaust parameters of the small turbine under the working condition of low load peak regulation due to the fact that the parameters do not meet the heat supply are avoided.
Drawings
FIG. 1 is a block diagram of a heating reformation system for reducing the temperature and the pressure of inlet steam of a deep peak-shaving down-stream engine;
FIG. 2 is a block diagram of a pipe unit of a main pipe for reducing temperature and pressure of steam inlet of a steam turbine;
FIG. 3 is a block diagram of an ultra-high pressure exhaust steam pipe unit and a steam admission pipe unit of a steam turbine;
wherein, the 100-ultra-high pressure steam exhaust pipeline,
200-a steam inlet pipeline of a steam guiding small machine, 210-a steam inlet bypass pipeline of the steam guiding small machine,
201-electric gate valve, 202-check valve, 211-gate valve, 212-electric regulating valve and 213-electric gate valve;
300-steam guiding small machine steam inlet temperature and pressure reducing pipeline, 310-heat and pressure reducing pipeline, 320-temperature and pressure reducing pipeline,
301-a first electric gate valve, 302-a first check valve, 303-a second electric gate valve, 304-a temperature and pressure reducer, 305-a safety valve;
311-flowmeter, 312-third electric gate valve;
321-stop valve number one, 322-stop valve number two, 323-filter screen, 324-electric stop valve, 325-electric regulating valve, 326-stop valve number three, 327-check valve number two.
Detailed Description
The heat supply reforming system of the present invention, in which the inlet steam of the small-sized steam turbine is cooled and depressurized, will be described in more detail with reference to the schematic drawings, wherein preferred embodiments of the present invention are shown, it being understood that the present invention described herein can be modified by those skilled in the art while still achieving the advantageous effects of the present invention. Accordingly, the following description is to be construed as broadly known to those skilled in the art and not as limiting the invention.
As shown in fig. 1-3, a heat supply transformation system for reducing temperature and pressure by steam inlet of a steam-guiding small machine under deep peak regulation adopts a technical scheme that the steam inlet of the steam-guiding small machine is switched to a temperature and pressure reducing pipeline, so that thermal decoupling of a unit is realized, and the unit can supply heat to the outside stably under the working condition of 50% THA and below. Through unit heat supply transformation scheme, guaranteed the unit when degree of depth peak shaver, the unit can steady operation and through the external heat supply of vapour introduction little machine admission decompression, guaranteed the stability of heat supply network, simultaneously, avoided vapour introduction little machine exhaust steam parameter under the low load peak shaver operating mode because the parameter does not satisfy the heat supply and directly discharged enthalpy value loss and the working medium loss that causes.
Wherein, THA operating mode: the heat consumption rate is checked and accepted, the steam turbine is normally put into operation in the rated steam inlet parameter, rated back pressure and the regenerative system, the water supplementing rate is 0%, and the power emitted by the steam turbine can be continuously operated. The 50% tha condition represents a unit operating power of 50% of the power emitted under the heat rate acceptance condition.
The heating reformation system comprises: the ultrahigh pressure steam exhaust pipeline unit, the steam inlet pipeline unit of the steam guiding small machine and the steam inlet temperature and pressure reducing and heat supply main pipe unit of the steam guiding small machine.
As shown in fig. 3, the ultra-high pressure exhaust pipe unit includes: the ultrahigh pressure steam exhaust pipeline 100 is communicated with an ultrahigh pressure cylinder of the steam turbine, and the other end of the ultrahigh pressure steam exhaust pipeline is communicated with a high-temperature reheater of the boiler.
The steam leading little machine admission pipeline unit includes:
a steam inlet pipeline 200 of the steam guiding small machine;
the small turbine inlet bypass pipeline 210 is communicated with the small turbine inlet pipeline 200.
The steam inlet pipeline 200 of the steam guiding small machine is sequentially provided with an electric gate valve 201 and a check valve 202.
The steam inlet bypass pipeline 210 of the steam guiding small machine is sequentially provided with a gate valve 211, an electric regulating valve 212 and an electric gate valve 213.
The steam-guiding small machine steam-inlet temperature-reducing and pressure-reducing pipeline is arranged between the steam-guiding small machine steam-inlet pipeline unit and the heat supply main pipe, and is started to be used under 50% THA working condition of the unit.
As shown in fig. 2, the steam guiding small machine steam inlet temperature and pressure reducing heat supply main pipe unit comprises:
a steam-guiding small-machine steam-inlet temperature-reducing and pressure-reducing main pipe 300 is provided with a first electric gate valve 301, a first check valve 302, a second electric gate valve 303, a temperature-reducing and pressure-reducing device 304 and a safety valve 305 in sequence;
wherein, the first electric gate valve 301 is arranged close to the steam inlet pipeline 200 of the steam guiding small machine;
the temperature and pressure reducer 304 is connected with a temperature and pressure reducing valve and then is connected with a heat supply main pipe pipeline 310 and a temperature and pressure reducing water pipeline 320;
after the temperature and pressure reducing valve, the heat supply main pipe pipeline 310 is connected with the heat supply main pipe;
the output end of the temperature-reducing water pipe 320 is connected with the temperature-reducing pressure reducer 304.
A flowmeter 311 and a third electric gate valve 312 are sequentially arranged on the heat supply main pipe pipeline 310 behind the temperature and pressure reducing valve; a flow meter 311 is disposed proximate to the desuperheater reducer 304.
The first stop valve 321, the second stop valve 322, the filter screen 323, the electric stop valve 324, the electric regulating valve 325, the third stop valve 326 and the second check valve 327 are sequentially arranged on the temperature reducing water pipeline 320.
In the embodiment, the steam inlet temperature and pressure reducing pipeline system of the steam guiding small machine is started and put into use at 40% THA of the unit, the maximum steam extraction amount is 57.1t/h, and the maximum heat supply amount is 61.5t/h.
In the embodiment, parameters before the steam introduction of the steam introduction small machine are 4.232MPa,432.2 ℃ and parameters after the temperature and pressure reduction are 1.5MPa,300 ℃.
In the embodiment, the steam parameters of the steam guiding small machine after steam inlet, temperature reduction and pressure reduction are 1.5MPa and 300 ℃, so that the heat supply parameter requirements are met.
The heat supply transformation system for reducing temperature and pressure by introducing steam into the small turbine is applied to a unit under 40% THA working condition, and comprises the following steps:
step one, starting a first electric gate valve 301 and a second electric gate valve 303, synchronously starting a third electric gate valve 312, and starting an electric stop valve 324 after the first electric gate valve and the second electric gate valve are in place;
step two, synchronously closing the electric gate valve 201, the electric regulating valve 212 and the electric gate valve 213; the steam inlet of the steam-removing small-sized guiding machine is switched into a temperature-removing and pressure-reducing pipeline;
step three, after each valve is in place, opening the electric regulating valve 325 and setting the opening to a certain value, and setting the opening of the pressure regulating valve of the temperature and pressure reducer to a certain value;
step four, the pressure regulating valve of the temperature and pressure reducer 304 is set to be automatic, and the outlet pressure of the temperature and pressure reducer 304 is tracked; the electrically operated regulator valve 325 is set to be automatic, tracking the outlet temperature of the desuperheater and reducer 304.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the invention without departing from the scope of the technical solution of the invention, and the technical solution of the invention is not departing from the scope of the invention.
Claims (10)
1. The utility model provides a heat supply transformation system of vapour admission decompression of vapour introduction machine under degree of depth peak regulation which characterized in that includes:
an ultrahigh pressure steam exhaust pipeline unit and a steam inlet pipeline unit of a steam guiding small machine;
and a heat supply main pipe unit for reducing temperature and pressure of steam inlet of the steam guiding small machine, which is communicated with the steam inlet pipeline unit of the steam guiding small machine, and comprises:
a steam inlet temperature-reducing and pressure-reducing main pipe (300) of the steam guiding small machine is provided with a first electric gate valve (301), a first check valve (302), a second electric gate valve (303), a temperature-reducing and pressure-reducing device (304) and a safety valve (305) in sequence;
wherein the first electric gate valve (301) is arranged close to the steam inlet pipeline (200) of the steam guiding small machine;
the temperature and pressure reducer (304) is connected with a temperature and pressure reducing valve and then is connected with a heat supply main pipe (310) and a temperature reducing water pipe (320);
the temperature and pressure reducing valve is followed by a heat supply main pipe pipeline (310) which is communicated with the heat supply main pipe unit B;
the output end of the temperature-reducing water pipeline (320) is connected with a temperature-reducing pressure reducer (304).
2. The heat supply reconstruction system for the steam inlet, the temperature reduction and the pressure reduction of the deep peak shaving down-draft mini-machine according to claim 1 is characterized in that a flowmeter (311) and a third electric gate valve (312) are sequentially arranged on a heat supply main pipe pipeline (310) behind the temperature reduction and pressure reduction valve; the flowmeter (311) is arranged close to the temperature and pressure reducer (304).
3. The heat supply reconstruction system for reducing the temperature and the pressure of the inlet steam of the deep peak-shaving down-draft mini-machine according to claim 1, wherein a first stop valve (321), a second stop valve (322), a filter screen (323), an electric stop valve (324), an electric regulating valve (325), a third stop valve (326) and a second check valve (327) are sequentially arranged on the temperature reducing water pipeline (320).
4. The heat supply modification system for reducing temperature and pressure of steam inlet of deep peak shaving down-draft turbine according to claim 1, wherein the steam inlet pipe unit of the steam draft turbine comprises:
a steam inlet pipeline (200) of the steam guiding small machine;
and the steam inlet bypass pipeline (210) of the steam guiding small machine is communicated with the steam inlet pipeline (200) of the steam guiding small machine.
5. The heat supply reconstruction system for reducing the temperature and the pressure of the steam inlet of the deep peak shaving down-draft turbine according to claim 4, wherein the steam inlet pipeline (200) of the steam draft turbine is sequentially provided with an electric gate valve (201) and a check valve (202).
6. The heat supply reconstruction system for reducing the temperature and the pressure of the inlet steam of the deep peak shaving down-draft turbine according to claim 4, wherein the inlet steam bypass pipeline (210) of the steam draft turbine is sequentially provided with a gate valve (211), an electric regulating valve (212) and an electric gate valve (213).
7. The heat supply modification system for reducing temperature and pressure of deep peak shaving down-draft mini-engine inlet steam according to claim 1, wherein the ultra-high pressure steam exhaust pipeline unit comprises:
the ultrahigh pressure steam exhaust pipeline (100) is communicated with an ultrahigh pressure cylinder of the steam turbine, and the other end of the ultrahigh pressure steam exhaust pipeline is communicated with a high-temperature reheater of the boiler.
8. The heat supply modification system for deep peak shaving down-draft mini-engine steam admission, temperature reduction and pressure reduction according to claim 1, wherein the steam draft mini-engine steam admission, temperature reduction and pressure reduction pipeline unit is started and put into use under 50% tha working condition of the unit.
9. The heat supply reconstruction system for the steam inlet, the temperature reduction and the pressure reduction of the deep peak shaving down-draft turbine according to claim 1, wherein the heat supply quantity of the steam inlet, the temperature reduction and the pressure reduction pipeline unit of the steam draft turbine is 130t/h.
10. The heat supply transformation method for the steam inlet, temperature reduction and pressure reduction of the deep peak regulation lower steam guiding small machine is characterized by comprising the step of switching the steam inlet of the steam guiding small machine to a temperature reduction and pressure reduction pipeline before a valve group, and specifically comprising the following steps of:
step one, starting a first electric gate valve (301) and a second electric gate valve (303), synchronously starting a third electric gate valve (312), and starting an electric stop valve (324) after the first electric gate valve and the second electric gate valve are in place;
step two, synchronously closing an electric gate valve (201) and an electric regulating valve (212), and an electric gate valve (213); the steam inlet of the steam-removing small-sized guiding machine is switched into a temperature-removing and pressure-reducing pipeline;
step three, after each valve is in place, opening an electric regulating valve (325) and setting the opening to a certain value, and setting the opening of a pressure regulating valve of the temperature-reducing pressure reducer to a certain value;
step four, setting a pressure regulating valve of the temperature and pressure reducing device (304) to be automatic, and tracking the outlet pressure of the temperature and pressure reducing device (304); the electric control valve (325) is set to be automatic and tracks the outlet temperature of the temperature and pressure reducer (304).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311671473.XA CN117704448A (en) | 2023-12-06 | 2023-12-06 | Heat supply transformation system and method for deep peak regulation and low steam introduction of small engine for steam inlet, temperature reduction and pressure reduction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311671473.XA CN117704448A (en) | 2023-12-06 | 2023-12-06 | Heat supply transformation system and method for deep peak regulation and low steam introduction of small engine for steam inlet, temperature reduction and pressure reduction |
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| CN117704448A true CN117704448A (en) | 2024-03-15 |
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