CN109798157B - Condensing and back-pumping coupled steam extraction integrated system for thermoelectric unit power peak regulation and operation method thereof - Google Patents
Condensing and back-pumping coupled steam extraction integrated system for thermoelectric unit power peak regulation and operation method thereof Download PDFInfo
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Abstract
The invention relates to a condensation back-extraction coupling steam extraction integrated system for electric power peak regulation of a thermoelectric unit and an operation method thereof, wherein the condensation back-extraction coupling steam extraction integrated system comprises a power station boiler, a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder, a generator, a condenser, a first temperature and pressure reduction device, a pressure matching device, a second temperature and pressure reduction device, a steam heat storage device and a temperature reduction device; in addition, when the steam extraction integration is carried out, the pressure matching device and the temperature and pressure reduction device are coupled, the working capacity loss of steam is further reduced while the whole working condition operation of unit heat supply is realized, the cascade utilization of energy is realized, and particularly, the novel condensing back heat supply is coupled, the utilization of high-parameter steam is effectively reduced, and the full utilization of steam energy is realized.
Description
Technical Field
The invention belongs to the technical field of cogeneration, and particularly relates to a condensation back-pumping coupling steam extraction integrated system for power peak regulation of a thermoelectric unit and an operation method thereof.
Background
At present, the policy in China gradually pays attention to popularization of new energy sources, reduces the proportion of the thermal power generating unit, and makes the development of the thermal power generating unit face serious tests. Currently, in order to improve the comprehensive energy utilization efficiency of the thermal power generating unit and strive for more power generation utilization hours, the heat change of the pure condensing unit is widely developed. However, for different industrial steam users, the required steam pressure parameters are different due to different processes, and for the thermoelectric unit, only one main pipeline for externally supplying steam is provided, namely, only one pressure parameter steam can be externally supplied. This results in: when the external steam supply pressure of the thermoelectric unit is higher, residual pressure loss is caused for users requiring low-pressure steam; when the external steam supply pressure of the thermoelectric unit is low, the steam parameters can not meet the requirements of users who demand high-pressure steam.
At present, the patent technology for adjusting the industrial heat supply and steam extraction mainly comprises the following steps: (1) An adjustable industrial extraction method of medium pressure of high-power steam turbine (patent number 201611212458.9) is to change the number of medium pressure regulating valves and reasonably design the throat size of each valve according to the size of the industrial extraction, thus realizing the adjustment of the industrial extraction of the unit under different loads; (2) The industrial heat supply energy-saving structure of variable load thermal power plant and its regulating method (patent number 201710247595.4) are characterized by that it is an integration of different steam extraction modes of industrial steam extraction, cold re-extraction and hot re-extraction, and coupled with small steam turbine and pressure matcher, etc. so as to implement the regulation of external steam supply mode according to the change of steam extraction quantity and machine set output, and can ensure that the steam extraction pressure can meet external requirements. The invention is based on the invention which simultaneously meets the peak shaving requirement of the power grid and the external heat supply requirement.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a condensation back-pumping coupling steam extraction integrated system for regulating the electric peak of a thermoelectric unit, which is reasonable in design and reliable in performance, and an operation method thereof.
The invention solves the problems by adopting the following technical scheme: a condensation back-extraction coupled extraction integrated system for thermoelectric unit power peak shaving, comprising: the utility model comprises a power station boiler, a turbine high pressure cylinder, a turbine medium pressure cylinder, a turbine low pressure cylinder, a generator, a condenser, a first temperature and pressure reducing device, a pressure matching device, a second temperature and pressure reducing device, a steam heat storage device and a temperature reducing device, wherein the turbine high pressure cylinder, the turbine medium pressure cylinder and the turbine low pressure cylinder are coaxially connected and drive the generator to generate power, a boiler water supply pipe is connected with a water supply inlet of the power station boiler, a main steam port of the power station boiler is connected with a steam inlet of the turbine high pressure cylinder through a main steam pipe, a first regulating valve is arranged at the steam inlet of the turbine high pressure cylinder, a steam outlet of the turbine high pressure cylinder is connected with a cold re-steam port of the power station boiler through a cold re-steam pipe, a third regulating valve and a fourth regulating valve are respectively arranged at the steam outlet of the turbine high pressure cylinder and the cold re-steam port of the power station boiler, the hot re-steam port of the utility boiler is connected with the steam inlet of the middle pressure cylinder of the steam turbine through a hot re-steam pipe, a sixth regulating valve is arranged at the steam inlet of the middle pressure cylinder of the steam turbine, the steam outlet of the middle pressure cylinder of the steam turbine is connected with the steam inlet of the low pressure cylinder of the steam turbine through a communicating pipe, a hydraulic butterfly valve is arranged on the communicating pipe, the steam outlet of the low pressure cylinder of the steam turbine is connected with a condenser, the steam inlet end of a main steam bypass is connected with a main steam pipe, the steam outlet end of the main steam bypass is connected with a cold re-steam pipe, a second regulating valve, a first temperature and pressure reducing device and a first gate valve are sequentially arranged on the main steam bypass along the steam flow direction, the steam inlet end of the cold re-steam bypass is connected with the cold re-steam pipe, the steam outlet end of the cold re-steam bypass is connected with the steam outlet end of the hot re-steam bypass, a fifth regulating valve is arranged on the cold re-steam bypass, the steam inlet end of the hot re-steam bypass is connected with the hot re-steam pipe, the steam turbine medium pressure cylinder is characterized in that a seventh regulating valve is installed on the hot re-steam bypass, the steam extraction port of the steam turbine medium pressure cylinder is connected with an industrial steam supply pipe through an industrial steam extraction pipe, an eighth regulating valve is installed on the industrial steam extraction pipe, the low-pressure steam inlet of the pressure matching device is connected with the steam outlet of the steam turbine medium pressure cylinder through a low-pressure steam pipe, a tenth regulating valve is installed on the low-pressure steam pipe, the high-pressure steam inlet of the pressure matching device is connected with the steam outlet end of the cold re-steam bypass through a first high-pressure steam branch pipe, an eleventh regulating valve is installed on the first high-pressure steam branch pipe, the medium-pressure steam outlet of the pressure matching device is connected with the industrial steam supply pipe through a medium-pressure steam pipe, a twelfth regulating valve is installed on the medium-pressure steam pipe, the inlet of the second temperature reducing device is connected with the steam outlet end of the cold re-steam bypass through a second high-pressure steam branch pipe, a thirteenth regulating valve is installed on the second high-pressure steam branch pipe, the second temperature reducing device is connected with the steam outlet end of the cold re-steam bypass through a second high-pressure steam branch pipe, the second high-pressure reducing valve is installed on the second high-pressure steam branch pipe, the medium-pressure reducing valve is installed on the medium-pressure steam valve is connected with the steam inlet of the steam turbine medium-pressure steam turbine medium pressure steam pipe, the medium-pressure reducing valve is installed along the medium-pressure steam inlet of the medium-pressure steam valve, the medium-pressure reducing valve is connected with the medium-pressure steam valve, the medium-pressure steam valve is installed with the medium-pressure steam valve, and the medium-pressure steam valve is sequentially, the medium-pressure steam valve is installed along the medium-pressure steam valve, and the medium pressure steam valve is connected with the medium steam valve, and the steam valve is connected with the steam valve, and the steam valve is, the steam valve is steam valve, the steam valve is.
Furthermore, the temperature reducing device can be a water spraying attemperator or an indirect heat exchange cooler.
Further, the cold re-steam pipe is connected to both the main steam bypass and the cold re-steam bypass.
Further, the hot re-steam bypass is connected to the cold re-steam bypass, the first high pressure steam branch pipe, the second high pressure steam branch pipe and the third high pressure steam branch pipe simultaneously.
Further, the pressure matching device, the second temperature and pressure reducing device and the steam heat storage device are connected in parallel.
Furthermore, the hydraulic butterfly valve is a valve without mechanical limit, and fluid does not leak when the valve is fully closed.
The operation method of the condensation back-extraction coupling steam extraction integrated system for the electric power peak regulation of the thermoelectric unit comprises the following steps:
when the unit is in a heating working condition and no power peak regulation is required, the specific operation of external heating at the moment is as follows:
opening an eighth regulating valve, and directly supplying heat to the outside through an industrial steam extraction pipe by utilizing industrial steam extraction of the steam turbine;
or opening a tenth regulating valve, an eleventh regulating valve and a twelfth regulating valve, and utilizing the pressure matching device to supply heat to the outside;
or opening a thirteenth regulating valve and a fourteenth regulating valve, and utilizing a second temperature and pressure reducing device to supply heat to the outside;
when the unit is in a heating working condition and has power peak regulation requirements:
A. when the unit needs to reduce the external output electric load, the output of the steam turbine is reduced mainly by reducing the steam flow entering the steam turbine for doing work, and the specific operation is as follows:
the hydraulic butterfly valve is fully closed, the tenth regulating valve is fully opened, steam entering the low-pressure cylinder of the steam turbine for doing work is cut off, and exhaust steam of the medium-pressure cylinder of the steam turbine enters the pressure matching device through the low-pressure steam pipe for externally supplying heat, so that the steam flow entering the steam turbine for doing work is reduced; at the moment, the pressure reducing valve and the second gate valve are opened, the opening degree of the ninth regulating valve is regulated, and a small amount of exhaust steam of the turbine intermediate pressure cylinder is conveyed to the turbine low pressure cylinder after being subjected to temperature and pressure reduction to cool the turbine low pressure cylinder;
or, opening a fifteenth regulating valve, and performing steam heat accumulation by using a steam heat accumulation device to reduce the steam flow entering the steam turbine to do work;
B. when the unit needs to increase the external output electric load, the output of the turbine is improved mainly by increasing the steam flow entering the turbine to do work, and the specific operation is as follows:
closing the thirteenth regulating valve and the fourteenth regulating valve, and enabling the second temperature and pressure reducing device to no longer operate;
closing the tenth regulating valve, the eleventh regulating valve and the twelfth regulating valve, wherein the pressure matching device is no longer put into operation; at the moment, closing the ninth regulating valve and the second gate valve, and simultaneously, not cooling the low-pressure cylinder of the steam turbine;
at the moment, a sixteenth regulating valve is opened, a fifteenth regulating valve is closed, and the steam heat storage device is used for supplying heat to the outside; and simultaneously, when the external required heat supply is large, opening an eighth regulating valve, and utilizing the industrial steam extraction of the steam turbine to perform external supplementary heat supply.
The operation method of the condensation back-extraction coupling steam extraction integrated system for thermoelectric unit power peak regulation comprises the following steps:
when the unit is in a heat supply working condition, the operation steps for providing high-pressure steam for the pressure matching device, the second temperature and pressure reduction device and the steam heat storage device are as follows:
opening a fifth regulating valve, regulating the opening of the third regulating valve and the opening of the fourth regulating valve, and utilizing the exhaust steam of the high-pressure cylinder of the steam turbine as a source of high-pressure steam;
or opening a seventh regulating valve, regulating the opening of the sixth regulating valve, and taking the hot re-steam output by the power station boiler as a source of high-pressure steam;
or opening the second regulating valve, the first gate valve and the fifth regulating valve, and utilizing the main steam output by the power station boiler as a source of high-pressure steam.
The operation method of the condensation back-extraction coupling steam extraction integrated system for thermoelectric unit power peak regulation comprises the following steps:
when the unit provides high-pressure steam for the pressure matching device, the second temperature and pressure reducing device and the steam heat storage device, the exhaust steam of the high-pressure cylinder of the steam turbine is preferentially selected to be utilized, then the heat re-steam output by the power station boiler is selected to be utilized, and finally the main steam output by the power station boiler is selected to be utilized;
when the unit is in a heat supply working condition, the industrial steam extraction of the steam turbine is preferentially selected to directly perform external heat supply, the pressure matching device is selected to perform external heat supply, and the second temperature and pressure reduction device is selected to perform external heat supply.
The operation method of the condensation back-extraction coupling steam extraction integrated system for thermoelectric unit power peak regulation comprises the following steps:
when the unit is in a heating working condition and the output electric load of the unit needs to be reduced, the steam entering the low-pressure cylinder of the steam turbine is cut off to work preferentially so as to reduce the output electric load of the unit; secondly, selecting a steam heat storage device to store steam so as to reduce the output electric load of the unit;
when the unit is in a heat supply working condition and the output electric load of the unit needs to be lifted, the second temperature and pressure reduction device is stopped to perform external heat supply preferentially, and then the pressure matching device is stopped to perform external heat supply; at this time, the steam heat storage device is preferably used for supplying heat to the outside; and then, the industrial steam extraction of the steam turbine is selected to supply heat to the outside.
Compared with the prior art, the invention has the following advantages and effects: the integrated design of different steam extraction modes is carried out based on the energy cascade utilization principle, so that the operation capacity of the thermal electrolytic coupler of the large-scale thermoelectric unit is effectively improved, and the external heat supply requirement is ensured; in addition, when the steam extraction integration is carried out, the pressure matching device and the temperature and pressure reduction device are coupled, the working capacity loss of steam is further reduced while the whole working condition operation of unit heat supply is realized, the cascade utilization of energy is realized, and particularly, the novel condensing back heat supply is coupled, the utilization of high-parameter steam is effectively reduced, and the full utilization of steam energy is realized. After the invention is applied, the external heat supply capacity of the thermoelectric unit is deeply excavated, the requirements of electric power peak regulation and frequency modulation are met, the loss of the acting capacity in the heat supply process is effectively reduced, the requirements of the current national policy are particularly met, and the invention has higher practical application value.
Drawings
Fig. 1 is a schematic structural diagram of a condensation back-pumping coupled extraction integrated system for peak shaving of thermoelectric units according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to fig. 1, a condensation and extraction back coupling steam extraction integrated system for peak shaving of electric power of a thermoelectric unit in the present embodiment includes: the system comprises a power station boiler 1, a turbine high-pressure cylinder 2, a turbine medium-pressure cylinder 3, a turbine low-pressure cylinder 4, a generator 5, a condenser 6, a first temperature and pressure reduction device 7, a pressure matching device 8, a second temperature and pressure reduction device 9, a steam heat storage device 10 and a temperature reduction device 11.
The high pressure cylinder 2 of the turbine, the medium pressure cylinder 3 of the turbine and the low pressure cylinder 4 of the turbine are coaxially connected, and drive the generator 5 to do work and generate electricity, the boiler water supply pipe 21 is connected with the water supply inlet of the utility boiler 1, the main steam port of the utility boiler 1 is connected with the steam inlet of the high pressure cylinder 2 of the turbine through the main steam pipe 22, the first regulating valve 41 is arranged at the steam inlet of the high pressure cylinder 2 of the turbine, the steam outlet of the high pressure cylinder 2 of the turbine is connected with the cold re-steam port of the utility boiler 1 through the cold re-steam pipe 24, the third regulating valve 44 and the fourth regulating valve 45 are respectively arranged at the steam outlet of the high pressure cylinder 2 of the turbine and the cold re-steam port of the utility boiler 1 of the utility boiler, the hot re-steam port of the utility boiler 1 is connected with the steam inlet of the medium pressure cylinder 3 of the turbine through the hot re-steam pipe 26, the sixth regulating valve 47 is arranged at the steam inlet of the medium pressure cylinder 3 of the turbine, the steam outlet of the middle pressure cylinder 3 of the steam turbine is connected with the steam inlet of the low pressure cylinder 4 of the steam turbine through a communicating pipe 29, a hydraulic butterfly valve 50 is arranged on the communicating pipe 29, the steam outlet of the low pressure cylinder 4 of the steam turbine is connected with a condenser 6, the steam inlet of a main steam bypass 23 is connected with a main steam pipe 22, the steam outlet of the main steam bypass 23 is connected with a cold re-steam pipe 24, a second regulating valve 42, a first temperature and pressure reducing device 7 and a first gate valve 43 are arranged on the main steam bypass 23 in sequence along the steam flow direction, the steam inlet of the cold re-steam bypass 25 is connected with the cold re-steam pipe 24, the steam outlet of the cold re-steam bypass 25 is connected with the steam outlet of a hot re-steam bypass 27, a fifth regulating valve 46 is arranged on the cold re-steam bypass 25, the steam inlet of the hot re-steam bypass 27 is connected with the hot re-steam pipe 26, a seventh regulating valve 48 is arranged on the hot re-steam bypass 27, the steam extraction port of the middle pressure cylinder 3 of the steam turbine is connected with an industrial steam supply pipe 36 through an industrial steam extraction pipe 28, an eighth regulating valve 49 is arranged on the industrial steam extraction pipe 28, the low-pressure steam inlet of the pressure matching device 8 is connected with the steam discharge port of the middle pressure cylinder 3 of the steam turbine through a low-pressure steam pipe 31, a tenth regulating valve 54 is arranged on the low-pressure steam pipe 31, the high-pressure steam inlet of the pressure matching device 8 is connected with the steam discharge end of the cold re-steam bypass 25 through a first high-pressure steam branch pipe 32, an eleventh regulating valve 55 is arranged on the first high-pressure steam branch pipe 32, the medium-pressure steam outlet of the pressure matching device 8 is connected with the industrial steam supply pipe 36 through a medium-pressure steam pipe 33, a twelfth regulating valve 56 is arranged on the medium-pressure steam pipe 33, the steam inlet of the second temperature and pressure reducing device 9 is connected with the steam discharge end of the cold re-steam bypass 25 through a second high-pressure steam branch pipe 34, the thirteenth regulating valve 57 is installed on the second high-pressure steam branch pipe 34, the steam outlet of the second temperature and pressure reduction device 9 is connected with the industrial steam supply pipe 36, the fourteenth regulating valve 58 is installed on the steam outlet of the second temperature and pressure reduction device 9, the high-pressure steam inlet of the steam heat storage device 10 is connected with the steam outlet end of the cold re-steam bypass 25 through the third high-pressure steam branch pipe 35, the fifteenth regulating valve 59 is installed on the third high-pressure steam branch pipe 35, the medium-pressure steam outlet of the steam heat storage device 10 is connected with the industrial steam supply pipe 36, the sixteenth regulating valve 60 is installed on the medium-pressure steam outlet of the steam heat storage device 10, the steam outlet of the steam turbine medium-pressure cylinder 3 is also connected with the steam inlet of the steam turbine low-pressure cylinder 4 through the cooling steam pipe 30, and the ninth regulating valve 51, the pressure reducing valve 52 are sequentially installed on the cooling steam pipe 30 along the steam flow direction, A temperature reducing device 11 and a second gate valve 53.
The temperature reducing device 11 may be a water spray attemperator or an indirect heat exchange cooler.
The cold re-steam pipe 24 is connected to both the steam outlet end of the main steam bypass 23 and the steam inlet end of the cold re-steam bypass 25.
The steam outlet end of the hot re-steam bypass 27 is connected to the steam outlet end of the cold re-steam bypass 25, the first high-pressure steam branch pipe 32, the second high-pressure steam branch pipe 34 and the third high-pressure steam branch pipe 35 at the same time.
The pressure matching device 8, the second temperature and pressure reducing device 9 and the steam heat storage device 10 are connected in parallel.
The hydraulic butterfly valve 50 is a valve without mechanical limitation, and fluid does not leak when the valve is fully closed.
In this embodiment, the operation method of the condensation and extraction back coupling steam extraction integrated system for peak regulation of the thermoelectric unit power is specifically as follows:
when the unit is in a heating working condition and no power peak regulation is required, the specific operation of external heating at the moment is as follows:
opening an eighth regulating valve 49, and directly performing external heat supply through an industrial steam extraction pipe 28 by utilizing industrial steam extraction of the steam turbine;
or opening the tenth regulating valve 54, the eleventh regulating valve 55 and the twelfth regulating valve 56, and performing external heat supply by using the pressure matching device 8;
or opening the thirteenth regulating valve 57 and the fourteenth regulating valve 58, and using the second temperature and pressure reducing device 9 to supply heat to the outside;
when the unit is in a heating working condition and has power peak regulation requirements:
A. when the unit needs to reduce the external output electric load, the output of the steam turbine is reduced mainly by reducing the steam flow entering the steam turbine for doing work, and the specific operation is as follows:
the hydraulic butterfly valve 50 is fully closed, the tenth regulating valve 54 is fully opened, steam entering the low-pressure cylinder 4 of the steam turbine for doing work is cut off, and all exhaust steam of the medium-pressure cylinder 3 of the steam turbine enters the pressure matching device 8 through the low-pressure steam pipe 31 for carrying out external heat supply, so that the steam flow entering the steam turbine for doing work is reduced; at this time, the pressure reducing valve 52 and the second gate valve 53 are opened, the opening degree of the ninth regulating valve 51 is regulated, and a small amount of exhaust steam of the turbine intermediate pressure cylinder 3 is subjected to temperature and pressure reduction and then is conveyed to the turbine low pressure cylinder 4 to cool the turbine low pressure cylinder 4;
or the fifteenth regulating valve 59 is opened, and the steam heat storage device 10 is utilized for steam heat storage so as to reduce the steam flow entering the steam turbine for doing work;
B. when the unit needs to increase the external output electric load, the output of the turbine is improved mainly by increasing the steam flow entering the turbine to do work, and the specific operation is as follows:
closing the thirteenth regulating valve 57 and the fourteenth regulating valve 58, the second temperature-reducing and pressure-reducing device 9 is no longer put into operation;
closing the tenth regulating valve 54, the eleventh regulating valve 55 and the twelfth regulating valve 56, the pressure matching device 8 no longer being put into operation; at this time, the ninth regulating valve 51 and the second gate valve 53 are closed, and the turbine low pressure cylinder 4 is not cooled any more;
at this time, the sixteenth regulating valve 60 is opened, the fifteenth regulating valve 59 is closed, and heat is supplied to the outside by the steam heat storage device 10; meanwhile, when the external required heat supply is large, the eighth regulating valve 49 is opened, and the external supplementary heat supply is performed by utilizing the industrial steam extraction of the steam turbine.
In the specific operation method of the embodiment, the following steps are adopted:
when the unit is in a heating condition, the operation steps for providing high-pressure steam for the pressure matching device 8, the second temperature and pressure reduction device 9 and the steam heat storage device 10 are as follows:
opening a fifth regulating valve 46, regulating the opening degrees of the third regulating valve 44 and the fourth regulating valve 45, and utilizing the exhaust steam of the high-pressure cylinder 2 of the steam turbine as a source of high-pressure steam;
or opening a seventh regulating valve 48 to regulate the opening of the sixth regulating valve 47, and using the hot re-steam output by the utility boiler 1 as a source of high-pressure steam;
or the second regulating valve 42, the first gate valve 43 and the fifth regulating valve 46 are opened, and the main steam output from the utility boiler 1 is utilized as a source of high pressure steam.
In the specific operation method of the embodiment, the following steps are adopted:
when the unit provides high-pressure steam for the pressure matching device 8, the second temperature and pressure reduction device 9 and the steam heat storage device 10, the exhaust steam of the high-pressure cylinder 2 of the steam turbine is preferentially selected to be utilized, then the heat re-steam output by the power station boiler 1 is selected to be utilized, and finally the main steam output by the power station boiler 1 is selected to be utilized;
when the unit is in a heat supply working condition, the industrial steam extraction of the steam turbine is preferentially selected to directly perform external heat supply, the pressure matching device 8 is selected to perform external heat supply, and the second temperature and pressure reduction device 9 is selected to perform external heat supply.
In the specific operation method of the embodiment, the following steps are adopted:
when the unit is in a heating working condition and the output electric load of the unit needs to be reduced, the steam entering the low-pressure cylinder 4 of the steam turbine is preferentially selected to be cut off for acting so as to reduce the output electric load of the unit; secondly, the steam heat storage device 10 is used for carrying out steam heat storage to reduce the output electric load of the unit;
when the unit is in a heat supply working condition and the output electric load of the unit needs to be lifted, the second temperature and pressure reduction device 9 is stopped to perform external heat supply preferentially, and the pressure matching device 8 is stopped to perform external heat supply secondly; at this time, the steam heat storage device 10 is preferably used for supplying heat to the outside; and then, the industrial steam extraction of the steam turbine is selected to supply heat to the outside.
In a specific method of operation of this embodiment, all valves have the function of regulating the flow of the pipeline fluid.
In the specific operation method of the embodiment, the opening adjustment of all valves is completed through the remote operation of the DCS control system of the thermoelectric unit when the thermoelectric unit operates under different working conditions; the heat storage and release capacity and time of the steam heat storage device 10 need to be determined by considering the comprehensive factors such as the electric power peak regulation and frequency modulation requirements, the external heat supply capacity of the unit, the adjustment capacity of the steam extraction integrated system of the unit and the like.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (5)
1. A method of operating a condensation back-extraction coupled extraction integrated system for peak shaving of thermoelectric units, the system comprising: the utility model provides a power plant boiler (1), steam turbine high pressure cylinder (2), steam turbine intermediate pressure cylinder (3), steam turbine low pressure cylinder (4), generator (5), condenser (6), first temperature reduction and pressure reduction device (7), pressure matching device (8), second temperature reduction and pressure reduction device (9), steam heat accumulation device (10) and temperature reduction device (11), steam turbine high pressure cylinder (2), steam turbine intermediate pressure cylinder (3) and steam turbine low pressure cylinder (4) coaxial coupling, and drive generator (5) electricity generation, boiler feed pipe (21) are connected with the water inlet of power plant boiler (1), the main steam mouth of power plant boiler (1) is connected with the steam inlet of steam turbine high pressure cylinder (2) through main steam pipe (22), and install first governing valve (41) at the steam inlet of steam turbine high pressure cylinder (2), the exhaust of steam turbine high pressure cylinder (2) is connected with the cold and re-steam mouth of power plant boiler (1) through cold re-steam pipe (24), and install in the power plant boiler (1) and the steam inlet of power plant boiler (1) through the third governing valve (45) respectively, the steam inlet of the middle pressure cylinder (3) of the steam turbine is provided with a sixth regulating valve (47), the steam outlet of the middle pressure cylinder (3) of the steam turbine is connected with the steam inlet of the low pressure cylinder (4) of the steam turbine through a communicating pipe (29), the communicating pipe (29) is provided with a hydraulic butterfly valve (50), the steam outlet of the low pressure cylinder (4) of the steam turbine is connected with a condenser (6), the steam inlet of a main steam bypass (23) is connected with a main steam pipe (22), the steam outlet of the main steam bypass (23) is connected with a cold re-steam pipe (24), a second regulating valve (42), a first temperature and pressure reducing device (7) and a first gate valve (43) are sequentially arranged on the main steam bypass (23) along the steam flow direction, the steam inlet of the cold re-steam bypass (25) is connected with the cold re-steam pipe (24), the steam outlet of the cold re-steam bypass (25) is connected with the steam outlet of a hot re-steam bypass (27), a fifth regulating valve (46) is arranged on the cold re-steam bypass (25), the steam outlet of the main steam bypass (25) is connected with the hot re-steam bypass (27) through a steam pipe (36), the steam inlet of the steam turbine (27) is connected with the steam inlet of the steam turbine (27) through the steam pipe (36), the eighth regulating valve (49) is arranged on the industrial steam extraction pipe (28), the low-pressure steam inlet of the pressure matching device (8) is connected with the steam outlet of the medium-pressure cylinder (3) of the steam turbine through a low-pressure steam pipe (31), the tenth regulating valve (54) is arranged on the low-pressure steam pipe (31), the high-pressure steam inlet of the pressure matching device (8) is connected with the steam outlet end of the cold re-steam bypass (25) through a first high-pressure steam branch pipe (32), the eleventh regulating valve (55) is arranged on the first high-pressure steam branch pipe (32), the medium-pressure steam outlet of the pressure matching device (8) is connected with the industrial steam supply pipe (36) through a medium-pressure steam pipe (33), the twelfth regulating valve (56) is arranged on the medium-pressure steam pipe (33), the steam inlet of the second temperature-reducing and pressure-reducing device (9) is connected with the steam outlet end of the cold re-steam bypass (25) through a second high-pressure branch pipe (34), the thirteenth regulating valve (57) is arranged on the second high-pressure branch pipe (34), the third regulating valve (58) is connected with the steam outlet of the heat storage device (25) through the medium-pressure-reducing device (35), the third regulating valve (58) is arranged on the medium-pressure steam inlet of the medium-pressure steam pipe (9) is connected with the medium-pressure steam pipe (35), a fifteenth regulating valve (59) is arranged on the third high-pressure steam branch pipe (35), a medium-pressure steam outlet of the steam heat storage device (10) is connected with an industrial steam supply pipe (36), a sixteenth regulating valve (60) is arranged at the medium-pressure steam outlet of the steam heat storage device (10), a steam outlet of the steam turbine medium-pressure cylinder (3) is also connected with a steam inlet of the steam turbine low-pressure cylinder (4) through a cooling steam pipe (30), and a ninth regulating valve (51), a pressure reducing valve (52), a temperature reducing device (11) and a second gate valve (53) are sequentially arranged on the cooling steam pipe (30) along the steam flow direction; the cold re-steam pipe (24) is connected with the main steam bypass (23) and the cold re-steam bypass (25) at the same time; the hot re-steam bypass (27) is connected with the cold re-steam bypass (25), the first high-pressure steam branch pipe (32), the second high-pressure steam branch pipe (34) and the third high-pressure steam branch pipe (35) at the same time; the pressure matching device (8), the second temperature and pressure reducing device (9) and the steam heat storage device (10) are connected in parallel; the temperature reducing device (11) is a water spraying attemperator or an indirect heat exchange cooler;
the operation method is as follows:
when the unit is in a heating working condition and no power peak regulation is required, the specific operation of external heating at the moment is as follows:
opening an eighth regulating valve (49), and directly supplying heat to the outside through an industrial steam extraction pipe (28) by utilizing industrial steam extraction of the steam turbine;
or, opening a tenth regulating valve (54), an eleventh regulating valve (55) and a twelfth regulating valve (56), and performing external heat supply by using the pressure matching device (8);
or, opening a thirteenth regulating valve (57) and a fourteenth regulating valve (58), and performing external heat supply by using a second temperature and pressure reducing device (9);
when the unit is in a heating working condition and has power peak regulation requirements:
A. when the unit needs to reduce the external output electric load, the output of the steam turbine is reduced mainly by reducing the steam flow entering the steam turbine for doing work, and the specific operation is as follows:
the hydraulic butterfly valve (50) is fully closed, the tenth regulating valve (54) is fully opened, steam entering the low-pressure cylinder (4) of the steam turbine for doing work is cut off, and all exhaust steam of the medium-pressure cylinder (3) of the steam turbine enters the pressure matching device (8) through the low-pressure steam pipe (31) for supplying heat to the outside, so that the steam flow entering the steam turbine for doing work is reduced; at the moment, a pressure reducing valve (52) and a second gate valve (53) are opened, the opening degree of a ninth regulating valve (51) is regulated, and a small amount of exhaust steam of the turbine intermediate pressure cylinder (3) is conveyed to the turbine low pressure cylinder (4) after being subjected to temperature and pressure reduction, so that the turbine low pressure cylinder (4) is cooled;
or, opening a fifteenth regulating valve (59), and performing steam heat accumulation by using the steam heat accumulation device (10) to reduce the steam flow entering the steam turbine to do work;
B. when the unit needs to increase the external output electric load, the output of the turbine is improved mainly by increasing the steam flow entering the turbine to do work, and the specific operation is as follows:
closing the thirteenth regulating valve (57) and the fourteenth regulating valve (58), and the second temperature and pressure reducing device (9) is no longer put into operation;
closing the tenth regulating valve (54), the eleventh regulating valve (55) and the twelfth regulating valve (56), the pressure matching device (8) no longer being put into operation; at this time, the ninth regulating valve (51) and the second gate valve (53) are closed, and the low-pressure cylinder (4) of the steam turbine is not cooled any more;
at this time, the sixteenth regulating valve (60) is opened, the fifteenth regulating valve (59) is closed, and the steam heat storage device (10) is used for supplying heat to the outside; and when the external heat supply is large, opening an eighth regulating valve (49), and performing external supplementary heat supply by utilizing industrial steam extraction of the steam turbine.
2. The method of claim 1, wherein the hydraulic butterfly valve (50) is a mechanically-limited valve, and fluid does not leak when the valve is fully closed.
3. The method of operating a condensate back coupled extraction integrated system for peak shaving of a thermoelectric unit of claim 1, wherein:
when the unit is in a heat supply working condition, the operation steps for providing high-pressure steam for the pressure matching device (8), the second temperature and pressure reduction device (9) and the steam heat storage device (10) are as follows:
opening a fifth regulating valve (46), regulating the opening degrees of a third regulating valve (44) and a fourth regulating valve (45), and utilizing the exhaust steam of a high-pressure cylinder (2) of the steam turbine as a source of high-pressure steam;
or opening a seventh regulating valve (48), regulating the opening of the sixth regulating valve (47), and utilizing the hot re-steam output by the power station boiler (1) as a source of high-pressure steam;
alternatively, the second regulating valve (42), the first gate valve (43) and the fifth regulating valve (46) are opened, and the main steam output by the utility boiler (1) is used as a source of high-pressure steam.
4. The method of operating a condensate back coupled extraction integrated system for peak shaving of a thermoelectric unit of claim 3, wherein:
when the unit provides high-pressure steam for the pressure matching device (8), the second temperature and pressure reducing device (9) and the steam heat storage device (10), the exhaust steam of the high-pressure cylinder (2) of the steam turbine is preferentially selected to be utilized, then the heat output by the power station boiler (1) is selected to be utilized, and finally the main steam output by the power station boiler (1) is selected to be utilized;
when the unit is in a heat supply working condition, the industrial steam extraction of the steam turbine is preferentially selected to directly supply heat to the outside, the pressure matching device (8) is selected to supply heat to the outside, and the second temperature and pressure reduction device (9) is selected to supply heat to the outside.
5. The method of operating a condensate back coupled extraction integrated system for peak shaving of a thermoelectric unit of claim 4, wherein:
when the unit is in a heating working condition and the output electric load of the unit needs to be reduced, the steam entering the low-pressure cylinder (4) of the steam turbine is cut off to work preferentially so as to reduce the output electric load of the unit; secondly, selecting a steam heat storage device (10) to store steam so as to reduce the output electric load of the unit;
when the unit is in a heat supply working condition and the output electric load of the unit needs to be lifted, the second temperature and pressure reduction device (9) is stopped to supply heat to the outside preferentially, and the pressure matching device (8) is stopped to supply heat to the outside secondly; at this time, the steam heat storage device (10) is preferably used for supplying heat to the outside; and then, the industrial steam extraction of the steam turbine is selected to supply heat to the outside.
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| CN111255534A (en) * | 2020-03-31 | 2020-06-09 | 西安西热节能技术有限公司 | Steam storage peak regulation system and method applied to industrial steam supply system of coal-fired unit |
| CN111734503B (en) * | 2020-07-27 | 2024-05-17 | 哈尔滨汽轮机厂有限责任公司 | Combined cycle steam extraction and supplement system for increasing steam supply adjusting range |
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| CN114542219B (en) * | 2022-01-27 | 2023-09-22 | 上海电力大学 | System for heat supply generating set low pressure bypass heat accumulation peak shaving |
| CN114922708B (en) * | 2022-05-13 | 2023-08-22 | 华电电力科学研究院有限公司 | Operation stopping method based on supercritical reheating type double-pumping heat supply back pressure unit system |
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