CN213574263U - Factory-level multi-unit coupling combined transportation system for improving flexibility of thermal power generating unit - Google Patents
Factory-level multi-unit coupling combined transportation system for improving flexibility of thermal power generating unit Download PDFInfo
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- CN213574263U CN213574263U CN202022718053.0U CN202022718053U CN213574263U CN 213574263 U CN213574263 U CN 213574263U CN 202022718053 U CN202022718053 U CN 202022718053U CN 213574263 U CN213574263 U CN 213574263U
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Abstract
The utility model discloses a plant-level multi-unit coupling combined transportation system for improving the flexibility of a thermal power generating unit, which comprises a peak shaving boiler, an overheater, a small steam turbine, a generator and a condensed water leveling system; the main steam pipeline is communicated with an outlet of the superheater, the small steam turbine is communicated with the main steam pipeline through a steam flow regulating valve and a first pressure gauge, and the outlet of the small steam turbine is communicated with reheater inlet pipelines of other units in the plant through a pressure regulating valve and a second pressure gauge. The system extracts partial main steam, reduces the power generation load on the premise that the load of the peak shaving boiler is not changed, and the main steam is extracted and then enters other units as reheat steam after passing through the small steam turbine, so that the utilization rate of energy is improved. The electricity generated by the small steam turbine is used for a plant power system in a plant, and the plant power rate of each unit is reduced. The system can realize deep peak regulation and safe and stable operation of the thermal power generating unit, and has low investment cost.
Description
Technical Field
The utility model belongs to the technical field of generating set, a plant level multiunit coupling intermodal system who improves thermal power unit flexibility is related to.
Background
At present, thermal power faces the risk of excess of productivity and structuredness, and new energy faces great consumption pressure, so that thermal power must face deep peak shaving in order to develop new energy. The thermal power generating units are divided into heating units and non-heating units according to whether the thermal power generating units bear civil heat supply.
For the 'three north' area, the contradiction between wind and fire in the heating period is particularly prominent, the period with the best wind power resource is the winter heating period, the continuously increased heating demand and the continuously increased clean energy installation cause the peak regulation space to be very limited. Particularly, in northeast regions, most thermal power generating units are combined heat and power generating units, the peak regulation capacity is only 10-20%, new energy storage consumption and new energy increment development are influenced, and the hard gap of the peak regulation capacity causes serious electricity limitation of new energy in partial regions. The deep peak regulation of the heating unit mainly solves the problem of thermoelectric decoupling, the research on the aspect is deep, the technology is mature, and the common technology comprises a heat storage tank and an electrode boiler.
For a non-heating unit, the deep peak regulation is mainly realized by modifying a combustion system at present and improving the stable combustion characteristic of the unit. However, due to poor quality and unstable coal quality of domestic coal, the problems of safety of low-load stable combustion and hydrodynamic circulation of a boiler, full-load investment of a denitration device, low-load cooling of a steam turbine, flexibility of a control system during long-term low load and quick load change, operation cycle of equipment, service life attenuation and the like of a modified unit exist to different degrees, and further optimization and solution are needed. The non-heating unit has large volume, and if the peak regulation capacity can be improved, the new energy consumption proportion of the whole power grid can be obviously improved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a plant level multiunit coupling intermodal system that improves thermal power unit flexibility, this system can realize thermal power unit's degree of depth peak shaving and safety and stability operation, and investment cost is low.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a plant-level multi-unit coupling combined transportation system for improving flexibility of a thermal power generating unit comprises a peak shaving boiler, a small steam turbine and a generator; a superheater is arranged in the peak shaving boiler, an outlet of the superheater is communicated with a main steam pipeline, the main steam pipeline is communicated with an inlet of a small steam turbine, and an outlet of the small steam turbine is connected with an inlet of a reheater inlet pipeline and a generator.
The utility model discloses a further improvement lies in, and little steam turbine is back pressure type unit.
The utility model discloses further improvement lies in, and main steam pipeline is linked together through the entry of steam flow control valve with little steam turbine.
The utility model discloses further improvement lies in, is provided with first manometer between steam flow control valve and the little steam turbine.
The utility model discloses a further improvement lies in, and little steam turbine export is linked together through pressure regulating valve and reheater inlet pipe's entry.
The utility model discloses a further improvement lies in, is provided with the second manometer between pressure regulating valve and the reheater inlet pipe way.
The utility model is further improved by comprising a condensed water leveling system, wherein the condensed water leveling system comprises a condenser, a water pump and a peak shaving unit condenser; the outlet of the condenser is connected with the water pump, the water pump is connected with the condenser of the peak shaving unit, and the outlet of the inlet pipeline of the reheater is connected with the inlet of the condenser.
The utility model discloses a further improvement lies in, and the export of condenser links to each other with the water pump through condensate flow governing valve.
The utility model is further improved in that the device also comprises a condensed water leveling system, wherein the condensed water leveling system comprises a condenser, a condensed water flow regulating valve, a water pump and a peak shaving unit condenser; the condenser is a plurality of, and the export of every condenser links to each other with the water pump through condensate flow governing valve, and the water pump links to each other with the peak shaver set condenser, and the export of re-heater inlet pipe says and links to each other with the entry of every condenser.
Compared with the prior art, the utility model discloses following beneficial effect has:
improve factory level multiunit coupling intermodal system of thermal power unit flexibility when concrete operation, reduce the power generation load of peak shaver unit under the unchangeable condition of boiler load through the mode of extraction peak shaver unit owner steam, the reduction range is up to 10% of unit full load generated energy, has improved the flexibility of unit degree of depth peak shaver greatly. The main steam drives the motor through the little steam turbine and generates electricity the back, and the cooling step-down lets in the cold steam conduit of other units in the factory, under the unchangeable prerequisite of boiler load, improves the power generation load of other units, and the electricity that the little steam turbine sent is used for the station service power system of all units in the factory to the at utmost reduces the energy consumption loss of unit in the flexibility peak shaving in-process, improves the stability of boiler operation, and investment cost is lower.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a schematic diagram of the condensate leveling system of the present invention.
Wherein, 1 is a peak shaving boiler, 2 is a superheater, 3 is a main steam pipeline, 4 is a steam flow regulating valve, 5 is a first pressure gauge, 6 is a small steam turbine, 7 is a generator, 8 is a pressure regulating valve, 9 is a second pressure gauge, 10 is a reheater inlet pipeline, 11 is a condenser of other units in the plant, 12 is a condensate flow regulating valve, 13 is a water pump, and 14 is a peak shaving unit condenser.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
in order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
In addition, an element of the present invention may be said to be "secured to" or "disposed on" another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Referring to fig. 1 and 2, the plant-level multi-unit coupling intermodal system for improving the flexibility of the thermal power generating unit of the present invention includes a peak shaver boiler 1, a small steam turbine 6, a generator 7 and a condensate leveling system;
the peak regulation boiler 1 is internally provided with a superheater 2, the outlet of the superheater 2 is communicated with a main steam pipeline 3, the main steam pipeline 3 is communicated with the inlet of a small steam turbine 6 through a steam flow regulating valve 4 and a first pressure gauge 5, and the outlet of the small steam turbine 6 is communicated with the inlets of reheater inlet pipelines 10 of other units in a plant through a pressure regulating valve 8 and a second pressure gauge 9. The outlet of the reheater inlet pipe 10 is connected to a condensate leveling system.
The small steam turbine 6 is connected with the generator 7, and the generated electricity is communicated with an auxiliary power system.
The small steam turbine 6 is a back pressure type unit.
The power generation capacity of the small turbine 6 is 10% of the full load of the unit.
The condensate leveling system comprises condensers 11 of other units in the plant, a condensate flow regulating valve 12, a water pump 13 and a peak shaving unit condenser 14; the number of the condensers 11 is multiple, the outlet of each condenser 11 is connected with a water pump 13 through a condensate flow regulating valve 12, and the water pump is connected with a peak shaving unit condenser 14. The outlet of the reheater inlet duct 10 is connected to the inlet of each condenser 11.
The steam flow regulating valve 4 is started when the load of the peak shaving unit is lower than 40%.
The system adjusting method comprises the following steps:
the steam flow regulating valve 4 is jointly controlled by the generating load of the unit and the boiler load, the boiler load is kept to be not lower than 35% on the premise that the generating load meets the dispatching requirement, and the boiler load is improved as much as possible.
The pressure regulating valve 8 is controlled by the second pressure gauge 9 after the valve, so that the steam is decompressed to the pressure after the valve shown by the second pressure gauge 9 after passing through the pressure regulating valve 8. And the pressure regulating valve 8 corresponding to the second pressure gauge 9 with the largest number of readings on different branches is fully opened.
The back pressure of the small turbine 6 is determined by the reheater inlet pipe 10 of the branch of the second pressure gauge 9 with the largest indication.
The condensate flow regulating valve 12 is determined by the deaerator water level of the unit, and the deaerator water level of the unit is kept constant by regulating the condensate flow regulating valve 12.
The utility model discloses a concrete working process does:
when the load of the peak shaving unit is lower than 40%, the load is continuously reduced, the peak shaving boiler 1 faces the problems of low-load stable combustion and hydrodynamic force, the load of the peak shaving boiler 1 is kept unchanged, part of main steam is extracted, the power generation load can be reduced, and the power generation load is reduced on the premise that the load of the peak shaving boiler 1 is unchanged. The main steam is extracted and then is cooled and depressurized through the small steam turbine 6, and is introduced into reheater inlet pipelines 10 of other units in the plant to enter the other units as reheated steam, so that the utilization rate of energy is improved. The small steam turbine 6 is connected with the generator 7, and the generated electricity is used for a plant power system in a plant, so that the plant power rate of each unit is reduced, and the utilization rate of energy is further improved. In addition, the condensate flow regulating system ensures the balance of the condensate flow of each unit. The system can realize deep peak regulation and safe and stable operation of the thermal power generating unit, and has low investment cost.
The foregoing is illustrative of the preferred embodiments of the present invention only, and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to be changed. However, all changes which come within the scope of the independent claims of the invention are to be embraced therein.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Claims (8)
1. A plant-level multi-unit coupling combined transportation system for improving the flexibility of a thermal power generating unit is characterized by comprising a peak shaving boiler (1), a small steam turbine (6) and a generator (7); a superheater (2) is arranged in the peak shaving boiler (1), an outlet of the superheater (2) is communicated with a main steam pipeline (3), the main steam pipeline (3) is communicated with an inlet of a small steam turbine (6), and an outlet of the small steam turbine (6) is connected with an inlet of a reheater inlet pipeline (10) and a generator (7).
2. The plant-level multi-unit coupling intermodal system for improving the flexibility of thermal power generating units according to claim 1, characterized in that the small steam turbine (6) is a back pressure unit.
3. The plant-level multi-unit coupling intermodal system for improving the flexibility of thermal power generating units according to claim 1 is characterized in that a main steam pipeline (3) is communicated with an inlet of a small steam turbine (6) through a steam flow regulating valve (4).
4. The plant-level multi-unit coupling intermodal system for improving the flexibility of thermal power generating units according to claim 3 is characterized in that a first pressure gauge (5) is arranged between the steam flow regulating valve (4) and the small steam turbine (6).
5. The plant-level multi-unit coupled intermodal system for improving the flexibility of the thermal power generating unit according to claim 1, characterized in that an outlet of the small steam turbine (6) is communicated with an inlet of a reheater inlet pipe (10) through a pressure regulating valve (8).
6. A plant-level multi-unit coupled intermodal system for improving flexibility of thermal power generating units according to claim 5, characterized in that a second pressure gauge (9) is arranged between the pressure regulating valve (8) and the reheater inlet pipe (10).
7. The plant-level multi-unit coupling intermodal system for improving the flexibility of the thermal power generating units is characterized by further comprising a condensed water leveling system, wherein the condensed water leveling system comprises a condenser (11), a water pump (13) and a peak shaving unit condenser (14); the outlet of the condenser (11) is connected with a water pump (13), the water pump (13) is connected with a peak shaving unit condenser (14), and the outlet of the reheater inlet pipeline (10) is connected with the inlet of the condenser (11).
8. The plant-level multi-unit coupled intermodal system for improving the flexibility of the thermal power generating units is characterized in that an outlet of a condenser (11) is connected with a water pump (13) through a condensate flow regulating valve (12).
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| CN202022718053.0U CN213574263U (en) | 2020-11-21 | 2020-11-21 | Factory-level multi-unit coupling combined transportation system for improving flexibility of thermal power generating unit |
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