CN220451990U - Thermal power generating unit depth peak regulation system adopting electric heating technology - Google Patents
Thermal power generating unit depth peak regulation system adopting electric heating technology Download PDFInfo
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Abstract
The utility model relates to a thermal power generating unit depth peak shaving system of an electric heating technology, which comprises: the variable working condition motor unit, the main transformer and the high-speed transformer are electrically connected with the variable working condition motor unit through a bus, and the high-speed transformer is electrically connected with the bus; the auxiliary power consumption equipment is electrically connected with the high-power plant transformer and is used for supplying power to the auxiliary power consumption equipment when the rated power of the variable-working-condition motor unit is lower than the set power; the auxiliary power consumption equipment comprises an electric heating system and is used for supplementing heat to the variable-working-condition motor group; when the rated power of the variable working condition motor unit is lower than the set power, the steam inlet flow of the variable working condition motor unit is unchanged; the quick response of the unit frequency modulation is realized by reducing the electric quantity of the main transformer integrated bus and increasing the variable power consumption of a high factory, so that the deep peak regulation is quickly completed under the condition that the inlet steam flow of the variable working condition unit is unchanged; the running stability and economy of the unit are ensured; meanwhile, the requirements of safe and stable operation of the denitration system of the variable-working-condition unit can be met.
Description
Technical Field
The utility model relates to the technical field of deep peak regulation, in particular to a deep peak regulation system of a thermal power generating unit by an electric heating technology.
Background
Along with the change of the energy structure in China, great challenges are brought to a power grid system which takes a coal-fired unit as a main power supply structure. At present, the depth peak regulation target of coal-fired units in China is 30% THA, and the peak regulation target of partial areas or partial units is 20% THA.
The existing coal-fired generator set is designed in one machine and one furnace, when the generator set is in deep peak shaving, particularly when the generator set is in deep peak shaving to be below 30% THA load working condition or is frequently operated in ultra-low mode, the steam inlet volume flow of a low-pressure cylinder of the variable working condition generator set is smaller, the temperature of steam discharged by the low-pressure cylinder is increased, the cylinder is deformed after long-time low-load operation, and meanwhile, the water erosion or the blast phenomenon of a final stage blade of the low-pressure cylinder (sub) is caused due to the smaller steam inlet volume flow of the pneumatic cylinder.
In order to solve the problem, the prior art also makes corresponding improvements, such as a thermal power molten salt and storage battery hybrid energy storage system with a publication number of CN217904029U, the online electric quantity and the low-pressure cylinder steam inlet flow are regulated by electrically heating molten salt and then heating steam by using the molten salt, and then the purpose of deep peak regulation of a unit is achieved; however, in the actual operation process, in order to prevent the molten salt in the molten salt system from solidifying, the molten salt needs to be heated by electricity all the time to prevent solidification, so that the economy of the unit in normal operation is reduced.
Disclosure of Invention
The utility model aims to overcome the defect of low economical efficiency in the unit depth peak regulation process in the prior art, thereby providing a thermal power unit depth peak regulation system of an electric heating technology.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an electric heating technology electric machine group depth peak shaving system, comprising: a variable working condition unit, a main transformer and a high-speed plant,
the main transformer is electrically connected with the variable-working-condition motor unit through a bus, and the high-power transformer is electrically connected with the bus;
the auxiliary power consumption equipment is electrically connected with the high-power plant transformer and is used for supplying power to the auxiliary power consumption equipment when the rated power of the variable-working-condition motor unit is lower than the set power; the auxiliary power consumption equipment comprises an electric heating system and is used for supplementing heat to the variable-working-condition motor group; and when the rated power of the variable working condition motor unit is lower than the set power, the steam inlet flow of the variable working condition motor unit is unchanged.
Preferably, the electric heating system comprises an electric heating device and a heating means,
the electric heating device includes an electric heater;
the heating device comprises a heating water supply mechanism;
the high-voltage transformer is connected with a first power supply circuit;
the electric heater is arranged on the heating water supply mechanism, and the variable working condition unit is connected with the heating water supply mechanism; the high power plant is electrically connected with the electric heater through the first power supply circuit and supplies power to the electric heater.
Preferably, the heating water supply mechanism comprises a high-pressure heater, a valve body assembly and a pipe fitting;
the pipe fitting comprises a first water outlet pipe and a second water outlet pipe,
the inlet of the first water outlet pipe is communicated with the outlet of the boiler separator, and the inlet of the second water outlet pipe is communicated with the outlet of the deaerator; the outlet of the first water outlet pipe and the outlet of the second water outlet pipe are communicated with the inlet of the boiler economizer;
the electric heater is arranged on the first water outlet pipe, the inlet of the electric heater is communicated with the outlet of the boiler separator, and the outlet of the electric heater is communicated with the inlet of the boiler economizer;
the high-pressure heater is arranged on the second water outlet pipe, an inlet of the high-pressure heater is communicated with an outlet of the deaerator, and an outlet of the high-pressure heater is communicated with an inlet of the boiler economizer;
the valve body assembly includes a first valve body;
the first valve body is communicated with the first water outlet pipe between the outlet of the electric heating system and the inlet of the boiler economizer.
Preferably, the tube further comprises a bypass tube,
the bypass pipe comprises a first end and a second end, the first end is communicated with the first water outlet pipe between the inlet of the electric heater and the outlet of the boiler separator, and the second end is communicated with the second water outlet pipe between the outlet of the high-pressure heater and the inlet of the boiler economizer;
the valve body assembly further comprises a second valve body, a third valve body and a fourth valve body,
the second valve body is communicated with the second water outlet pipe between the inlet of the boiler economizer and the second end,
the third valve body is communicated with the bypass pipe,
the fourth valve body is communicated with the first water outlet pipe between the outlet of the boiler separator and the first end.
Preferably, the method is characterized in that,
the heating device also comprises an air supply mechanism;
the electric heating equipment further comprises an electric heater;
the high-voltage transformer is also connected with a second power supply circuit;
the electric radiator is arranged on the air supply mechanism, and the variable working condition unit is communicated with the air supply mechanism; the high power transformer is connected with the electric heater through the second power supply circuit and supplies power for the electric heater.
Preferably, the air supply mechanism comprises an air blower, a steam assembly and an air preheater;
the air supply outlet of the air feeder is communicated with the inlet of the steam assembly, and the outlet of the steam assembly is communicated with the inlet of the air preheater;
the electric heater is communicated between the inlet of the air preheater and the outlet of the steam assembly.
Preferably, the steam component comprises a steam heater, an auxiliary steam box and an auxiliary steam valve,
the inlet of the steam heater is communicated with the outlet of the blower, and the outlet of the steam heater is communicated with the inlet of the electric heater;
the steam heater further comprises an input port, the input port is communicated with the auxiliary steam box through an auxiliary steam pipe, and the auxiliary steam valve is communicated with the auxiliary steam pipe between the input port and the auxiliary steam box.
Preferably, a circulating pump is arranged on the first water outlet pipe, an inlet of the circulating pump is communicated with an outlet of the boiler separator, and an outlet of the circulating pump is communicated with the first end and an inlet of the electric heater.
Preferably, a water supply pump is arranged on the second water outlet pipe, an inlet of the water supply pump is communicated with an outlet of the deaerator, and an outlet of the water supply pump is communicated with an inlet of the high-pressure heater.
Compared with the prior art, the utility model has the beneficial effects that:
according to the thermal power unit depth peak regulation system adopting the electric heating technology, the high-power plant transformer is connected to the bus between the main transformer and the variable-working-condition unit, and the auxiliary power consumption equipment is connected with the high-power plant transformer; the quick response of the unit frequency modulation is realized by reducing the electric quantity of the main transformer integrated bus and increasing the variable power consumption of a high factory, so that the deep peak regulation is quickly completed under the condition that the inlet steam flow of the variable working condition unit is unchanged; the running stability and economy of the unit are ensured; in addition, the auxiliary power consumption equipment can also heat the variable-working-condition unit, so that the requirements of safe and stable operation of a denitration system of the variable-working-condition unit can be met; and the heat generated by auxiliary power consumption equipment can also reduce the energy consumption of the variable working condition unit to a certain extent, so that the resource allocation is optimized.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a depth peaking system of a motor set according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a power grid; 2. a main transformer; 3. a generator; 4. a variable working condition unit; 5. high factory change; 6. a first supply circuit; 61. a first circuit breaker; 62. a first buck converter; 7. a second supply circuit; 71. a second circuit breaker; 72. a second step-down transformer; 81. a first water outlet pipe; 811. an electric heater; 812. a circulation pump; 813. a boiler separator; 814. a first valve body; 815. a fifth valve body; 816. a fourth valve body; 82. a second water outlet pipe; 821. a high pressure heater; 822. a water feed pump; 823. a deaerator; 824. a second valve body; 825. a sixth valve body; 83. a boiler economizer; 84. a branch pipe; 841. a third valve body; 91. a blower; 92. a steam air heater; 93. an auxiliary steam box; 94. an auxiliary steam pipe; 941. an auxiliary steam valve; 95. an electric air heater; 96. an air preheater.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The embodiment of the utility model provides a thermal power generating unit depth peak shaving system of an electric heating technology, which is shown in fig. 1 and comprises the following components: a variable working condition unit, a main transformer 2 and a high-speed transformer 5; the variable working condition unit is used for doing work and generating electricity so as to be used for people to produce and live; the main transformer 2 is a main step-down transformer mainly used for power transmission and transformation in a unit or a transformer substation, and is a core part of the transformer substation; the high factory transformer 5 is a transformer connected with the power supply of the factory of the power generator 3; specifically, the main transformer 2 is electrically connected with the variable working condition unit through a bus, and the high-power plant transformer 5 is electrically connected with the bus and is used for receiving the acting power from the variable working condition unit to generate power; the auxiliary power consumption device comprises an electric heating system, wherein the electric heating system increases the output power of the high-power plant 5 to increase the power consumption of the high-power plant by reducing the internet-surfing electric quantity of the main transformer 2; when the rated power of the variable working condition unit is lower than the set power, namely, in the process of deep peak shaving of the variable working condition unit, the inlet steam flow of the variable working condition motor unit is unchanged, so that the aim of quick deep peak shaving operation of the unit is fulfilled; meanwhile, the electric heating system can also supplement heat to the variable-working-condition motor group, so that the heat efficiency of the boiler is improved; specifically, the variable working condition unit comprises a steam turbine 4 and a generator 3, and the generator 3 is used for generating power by matching with the steam turbine 4.
The high-power plant 5 is connected to a bus between the main transformer 2 and the variable-working-condition unit, and auxiliary power consumption equipment is electrically connected with the high-power plant 5; the quick response of the unit frequency modulation is realized by reducing the electric quantity of the main transformer 2 integrated bus and increasing the power consumption of the high-power plant variable 5, so that the deep peak regulation is quickly completed under the condition that the inlet steam flow of the variable-working-condition unit is unchanged; the running stability and economy of the unit are ensured; in addition, the auxiliary power consumption equipment can also heat the variable-working-condition unit, so that the requirements of safe and stable operation of a denitration system of the variable-working-condition unit can be met; and the heat generated by auxiliary power consumption equipment can also reduce the energy consumption of the variable working condition unit to a certain extent, so that the resource allocation is optimized.
Specifically, the electric heating system includes an electric heating apparatus including an electric heater 811 and a heating device including a heating water supply mechanism; the electric heater 811 is arranged on the heating water supply mechanism and is used for heating the outlet water in the heating water supply mechanism, and the variable working condition unit is communicated with the heating water supply mechanism and is used for receiving heat provided by the heating water supply mechanism; the high-power plant 5 is connected with a first power supply circuit 6, and the first power supply circuit 6 is connected with an electric heater 811 so that the electric heater 811 generates heat to heat the water discharged from the heating water supply mechanism; and the electric heater 811 includes a resistive heater.
Specifically, the first power supply circuit 6 is provided with a first electrical device, the first electrical device is connected between the high-power plant 5 and the electric heater 811, and is used for controlling and adjusting the power supply of the high-power plant 5 to the electric heater 811, and the first electrical device comprises a first circuit breaker 61 and a first step-down transformer 62; the first circuit breaker 61 can be used for realizing power supply on-off between the high-voltage power plant 5 and the electric heater 811, and the first voltage reduction power plant 62 can be used for converting and outputting higher voltage output by the high-voltage power plant 5 to the electric heater 811 into ideal voltage with relatively lower voltage, so that the purposes of reducing voltage, heating and discharging water are achieved.
Specifically, the heating water supply mechanism includes a high-pressure heater 821 and a pipe fitting; wherein the pipe fitting comprises a first water outlet pipe 81 and a second water outlet pipe 82; more specifically, the inlet of the first water outlet pipe 81 is communicated with the outlet of the boiler separator 813, and the outlet of the first water outlet pipe 81 is communicated with the inlet of the boiler economizer 83, so as to convey the outlet water of the boiler separator 813 into the boiler economizer 83; the inlet of the second water outlet pipe 82 is communicated with the outlet of the deaerator 823, and the outlet of the second water outlet pipe 82 is communicated with the inlet of the boiler economizer 83 and is used for conveying the outlet water of the deaerator 823 into the boiler economizer 83.
In order to facilitate heating of the outlet water of the boiler separator 813, an electric heater 811 is arranged on the first water outlet pipe 81, an inlet of the electric heater 811 is communicated with an outlet of the boiler separator 813, an outlet of the electric heater 811 is communicated with an inlet of the boiler economizer 83, namely, the outlet water of the boiler separator 813 is discharged from the first water outlet pipe 81, and is heated by the electrified electric heater 811 and then is input into the boiler economizer 83; in order to facilitate the water inlet and the heating of the deaerator 823, a high-pressure heater 821 is arranged on the second water outlet pipe 82, and the inlet of the high-pressure heater 821 is communicated with the outlet of the deaerator 823, and the outlet of the high-pressure heater 821 is communicated with the inlet of the boiler economizer 83; namely, the effluent of the deaerator 823 is discharged from the second water outlet pipe 82 and is heated by the high-pressure heater 821 and then is input into the boiler economizer 83; the high-pressure heater 821 uses part of extraction steam of the steam turbine 4 in the variable-working-condition unit to perform heat conversion, thereby realizing heating.
Under normal working conditions, when the outlet water temperature in the second outlet pipe 82 meets the requirement, the outlet water in the second outlet pipe 82 is only used for heating the boiler economizer 83; to achieve reasonable utilization of resources, the heated feedwater mechanism further includes a valve body assembly, and the valve body assembly includes a first valve body 814; wherein, the first valve body 814 is communicated with the first water outlet pipe 81 between the outlet of the electric heating system and the inlet of the boiler economizer 83, and is used for controlling the boiler separator 813 to deliver water from the first water outlet pipe 81 to the boiler economizer 83; then, when the outlet water temperature in the second outlet pipe 82 meets the requirement, the first valve body 814 can be closed, and the first short-circuiting device is opened, so that the electric heater 811 stops heating, and the electric energy in the first power supply circuit 6 is transmitted to the power grid 1 by the main transformer 2.
Preferably, in order to meet the inlet water temperature of the boiler economizer 83 during deep peak shaving of the unit, the pipe fitting further comprises a bypass pipe 84; specifically, the bypass pipe 84 includes a first end and a second end, the first end is connected to the first water outlet pipe 81 between the inlet of the electric heater 811 and the outlet of the boiler separator 813, and the second end is connected to the second water outlet pipe 82 between the outlet of the high pressure heater 821 and the inlet of the boiler economizer 83; in order to facilitate the working cooperation between the branch pipe 84 and the first water outlet pipe 81 and the second water outlet pipe 82, the valve body assembly further comprises a second valve body 824, a third valve body 841 and a fourth valve body 816; wherein the second valve body 824 is connected to the second outlet pipe 82 between the inlet and the second end of the boiler economizer 83, the third valve body 841 is connected to the bypass pipe 84, and the fourth valve body 816 is connected to the first outlet pipe 81 between the outlet and the first end of the boiler separator 813.
Specifically, during adjustment, the second valve 824 and the fourth valve 816 may be closed, and the first valve 814 and the third valve 841 may be opened, while the first circuit breaker 61 is connected, so that the high-power plant 5 supplies power to the electric heater 811 through the first power supply circuit 6; that is, the effluent from the deaerator 823 flows through the second water outlet pipe 82, is first heated by the high-pressure heater 821, flows into the first water outlet pipe 81 through the branch pipe 84, is second heated by the electric heater 811, and is finally input into the boiler economizer 83.
More specifically, in order to further reduce the electric quantity of the main transformer 2 incorporated into the electric network 1, the electric consumption of the high-power plant 5 is increased; the first breaker 61 can be simultaneously communicated by closing the second valve body 824 and opening the first valve body 814, the third valve body 841 and the fourth valve body 816, so that the high-power plant 5 can supply power to the electric heater 811 through the first power supply circuit 6; that is, the effluent from the deaerator 823 flows through the second water outlet pipe 82, is heated for the first time by the high-pressure heater 821, flows into the first water outlet pipe 81 through the branch pipe 84, is heated for the second time by the electric heater 811, and then enters the boiler economizer 83; at this time, based on the fourth valve 816 being opened, the outlet water of the boiler separator 813 flows out of the first outlet pipe 81, is mixed with the outlet water of the second outlet pipe 82, is heated by the electric heater 811, and then enters the boiler economizer 83.
In addition, in the present embodiment, for convenience of control, a fifth valve body 815 is disposed at the connection position between the first end of the bypass pipe 84 and the first water outlet pipe 81, and the on-off between the bypass pipe 84 and the first water outlet pipe 81 can be controlled by the fifth valve body 815, so as to avoid failure of the third valve body 841 and the fourth valve body 816; in addition, in order to facilitate the connection, a sixth valve body 825 is arranged at the connection position of the first water outlet pipe 81 and the second water outlet pipe 82 and the inlet of the boiler economizer 83, and the on-off of the first water outlet pipe 81, the second water outlet pipe 82 and the boiler economizer 83 can be controlled through the sixth valve body 825, so as to avoid the failure of the first valve body 814 and the second valve body 824; accordingly, both the fifth valve body 815 and the sixth valve body 825 are preferably three-way valves.
In addition, for the 600MW coal-fired unit, under the working condition of designing the lowest stable combustion operation load of 30% THA, the peak shaving system is adopted, and the electric heater 811 is used for heating the final effluent water, so that the deep peak shaving electric load of the unit is reduced by about 5% under the condition that the final effluent water temperature is increased by 15 ℃, and the requirements of safe and economic operation of the unit are met.
Preferably, in order to meet peak shaving requirements of the variable-working-condition unit; the heating device also comprises an air supply mechanism, the electric heating equipment also comprises an electric heater 95, and the high-power plant 5 is also connected with a second power supply circuit 7; namely, the electric heater 95 is powered by the second power supply circuit 7 through the high-power plant transformer 5, and the steam inlet flow of the variable-working-condition unit is kept unchanged in a mode of increasing the power consumption of the high-power plant transformer 5 and the air supply temperature; meanwhile, the heat efficiency of the boiler is improved; and the electric heater 95 includes an electrode type heater.
Specifically, the electric heater 95 is disposed on the air supply mechanism, and is used for heating the air supply in the air supply mechanism; the variable working condition unit is communicated with the air supply mechanism through an air pipe and is used for receiving heat of the air supply mechanism; the second power supply circuit 7 is connected with the electric radiator 95 and is used for supplying power to the electric radiator 95, so that the electric radiator 95 generates heat to heat wind in the air supply mechanism, and the power consumption of the high-power plant is increased to be 5.
The electric heater 95 is powered by the high-power plant transformer 5, so that the purposes of further reducing the electric quantity of the main transformer 2 integrated into the power grid 1 and increasing the electric consumption of the high-power plant transformer 5 are achieved, and the heat efficiency of the operation of the boiler is further improved by heating the incoming wind in the air supply mechanism to improve the incoming wind temperature, so that the inlet steam flow of the variable-working-condition unit is ensured to be unchanged; and the stable operation of the unit is guaranteed, the steam consumption of the auxiliary steam box 93 is effectively reduced, and the resource allocation is optimized.
Specifically, the second power supply circuit 7 is provided with second electrical equipment, the second electrical equipment is connected between the high-power plant 5 and the electric heater 95 and used for controlling and adjusting the power supply of the high-power plant 5 to the electric heater 95, the second electrical equipment comprises a second circuit breaker 71 and a second voltage reduction transformer 72, the power supply on-off between the high-power plant 5 and the electric heater 95 can be realized through the second circuit breaker 71, and the high-power plant 5 can output higher voltage which is output by the electric heater 95 through the second voltage reduction transformer 72 to be converted into relatively lower ideal voltage, so that the purpose of heating warm air is achieved.
Specifically, the blower mechanism includes a blower 91, a steam assembly, and an air preheater 96; wherein the blower 91 is used for feeding the incoming air required for combustion into the boiler; the steam assembly is used for heating the incoming air sent by the blower 91 into the boiler so as to improve the heat efficiency of the boiler; the air preheater 96 is used for preheating incoming air before entering the boiler so as to improve the heat exchange performance of the boiler and reduce energy consumption; that is, the air supply port of the blower 91 communicates with the inlet of the steam assembly, and the outlet of the steam assembly communicates with the inlet of the air preheater 96; to further increase the thermal efficiency of the boiler, an electric heater 95 is provided between the inlet of the air preheater 96 and the outlet of the steam assembly.
Specifically, the steam assembly includes a steam heater 92 and an auxiliary steam box 93; and the inlet of the steam heater 92 is communicated with the outlet of the blower 91, and the outlet of the steam heater 92 is communicated with the inlet of the electric heater 95; the steam heater 92 further comprises an input port, the auxiliary steam box 93 is communicated with the input port through an auxiliary steam pipe 94, steam is input into the steam heater 92, and air input by the blower 91 is heated by heating the steam heater 92; further, in order to facilitate control of the steam output from the auxiliary steam box 93, the steam assembly further includes an auxiliary steam valve 941, and the auxiliary steam valve 941 is connected to an auxiliary steam pipe 94 between the input port and the auxiliary steam box 93. Specifically, the auxiliary steam valve 941 is opened, and steam in the auxiliary steam box 93 is introduced into the steam heater 92, and heats the steam heater 92; meanwhile, the blower 91 is turned on and sends in incoming air, when the incoming air sent by the blower 91 flows through the steam heater 92, the temperature is raised and heated, and then the heated incoming air flows into the air preheater 96.
When the auxiliary steam valve 941 is closed, the auxiliary steam box 93 is not communicated with the steam heater 92, i.e. the steam heater 92 has no heat. At this time, the blower 91 is turned on and sends in the incoming air, when the incoming air sent by the blower 91 flows through the steam heater 92, the blower is not heated, and in order to reduce the steam consumption of the auxiliary steam box 93 and improve the temperature of the incoming air, the second circuit breaker 71 is connected, so that the electric heater 95 is powered by the high-power plant 5 through the second power supply circuit 7, the electric heater 95 generates heat, then the incoming air flowing through the electric heater 95 is heated by heating, and then the heated incoming air flows into the air preheater 96.
In order to facilitate the water outlet of the boiler separator 813, a circulating pump 812 is further arranged on the first water outlet pipe 81, an inlet of the circulating pump 812 is communicated with an outlet of the boiler separator 813, and an outlet of the circulating pump 812 is communicated with a first end of the bypass pipe 84 and an inlet of the electric heater 811; and in order to facilitate the water outlet of the deaerator 823, a water feeding pump 822 is further arranged on the second water outlet pipe 82, the inlet of the water feeding pump 822 is communicated with the inlet of the deaerator 823, and the outlet of the water feeding pump 822 is communicated with the inlet of the high-pressure heater 821.
Specifically, the variable working condition unit comprises the following working conditions during deep peak shaving:
when the unit operates at 50% -100% rated power, the turbine 4 in the variable working condition unit applies work, and the power generated by the generator 3 enters the main transformer 2 and the high-power transformer 5; and is incorporated into the electric network 1 via the main transformer 2 and fed into the electric heating installation via the high-voltage transformer 5. At this time, the first circuit breaker 61 of the first power supply circuit 6 and the second circuit breaker of the second power supply circuit 7 connected to the high-speed plant 5 are in the off state, and the first valve body 814, the third valve body 841 and the fourth valve body 816 are in the off state, and the water discharged from the deaerator 823 is boosted by the water supply pump 822 group and heated, then enters the high-pressure heater 821, is heated and heated by the high-pressure heater 821, and finally enters the boiler economizer 83 through the second valve body 824 and the sixth valve body 825. And an auxiliary steam valve 941 arranged on the auxiliary steam pipe 94 is opened, the incoming steam of the auxiliary steam header enters the steam heater 92 to heat the air sent by the blower 91, and the heated air enters the air preheater 96 through the electric heater 95.
When the unit operates at 30% -50% of rated power and the unit needs to reduce load and peak regulation, quick response of unit frequency modulation can be realized by quickly reducing the on-line electric quantity of the unit on the premise of ensuring safe and stable operation of the unit, and at the moment, the first circuit breaker 61 of the first supply circuit 6 and the second circuit breaker of the second supply circuit 7 connected with the high-speed transformer 5 are in a communication state.
The electric quantity of the first power supply circuit 6 of the high-voltage power plant 5 is reduced from 20kV to 10kV or 6kV through the first voltage reduction transformer 62, and then the electric quantity is supplied to the electric heater 811, and the second valve body 824 and the fourth valve body 816 are both in a closed state. And the water discharged from the deaerator 823 is boosted and heated by the water supply pump 822 and then enters the high-pressure heater 821, and after being heated in the high-pressure heater 821, the water enters the electric heater 811 through the third valve body 841 and the fifth valve body 815, and after being heated in the electric heater 811, the water flows through the valve first valve body 814 and the sixth valve body 825 and enters the boiler economizer 83. On the premise of meeting the primary frequency modulation requirement of the unit, the mode of increasing the power consumption of the high-power plant variable 5 and reducing the electric quantity of the main transformer 2 integrated into the power grid 1 realizes the requirement of quick deep peak regulation operation of the unit under the condition that the steam inlet flow of the steam turbine 4 in the variable-working-condition unit is unchanged. Meanwhile, the water inlet temperature of the boiler economizer 83 can be effectively increased, and the requirements of safe and stable operation of a unit denitration system are met. The electric quantity of the second power supply circuit 7 of the high-voltage power plant 5 is reduced from 20kV to 10kV or 6kV through a second voltage reduction transformer 72, and then the electric quantity is supplied to the electric heater 95, and the auxiliary steam valve 941 is closed; the air coming from the blower 91 is heated in the electric heater 95 and then enters the air preheater 96, so that the steam consumption of the auxiliary steam header can be effectively reduced, the air temperature is increased, and the heat efficiency of the boiler is further improved.
When the unit is operated at 20% -30% of rated power, the boiler is operated in a wet state, and the boiler water recirculation system is operated. Under the condition of ensuring that the evaporation capacity of the variable-working-condition unit is unchanged, the deep peak regulation operation of the unit is realized as much as possible, and the deep peak regulation operation of the unit is finally realized by adopting the mode of heating the boiler recycling water by using the electric heater 811, so that the power consumption of the variable-working-condition unit 5 is further increased, the grid-connected electric quantity of the main transformer 2 is further reduced.
Specifically, the electric quantity of the first power supply circuit 6 of the high-voltage power plant 5 is reduced from 20kV to 10kV or 6kV through the first voltage reduction transformer 62, and then the electric quantity is supplied to the electric heater 811, and the second valve 824 is in a closed state; the water discharged from the deaerator 823 is boosted and heated by the water outlet pump set and then enters the high-pressure heater 821, the water is heated in the high-pressure heater 821 and then enters the electric heater 811 through the third valve body 841 and the fifth valve body 815, and the water discharged from the deaerator 823 is heated in the electric heater 811 and then enters the boiler economizer 83 through the first valve body 814 and the sixth valve body 825. Further, the outlet water of the boiler separator 813 is mixed with the outlet water in the second outlet pipe 82 through the circulating pump 812, the fourth valve body 816 and the fifth valve body 815, and then enters the electric heater 811, and after the temperature is raised in the electric heater 811, the outlet water flows through the valve first valve body 814 and the sixth valve body 825, and finally enters the boiler economizer 83; according to the method, on the premise of meeting the primary frequency modulation requirement of the unit, the power consumption of the high-power plant variable 5 can be further increased, the electric quantity of the main transformer 2 integrated into the bus of the power grid 1 can be reduced, and the requirement of quick deep peak regulation operation of the unit under the condition that the steam inlet flow of the steam turbine 4 in the variable-working-condition unit is unchanged is met. Meanwhile, the water inlet temperature of the boiler economizer 83 can be effectively increased, and the requirements of safe and stable operation of a unit denitration system are met.
The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.
Claims (9)
1. The utility model provides a thermal power generating unit degree of depth peak shaving system of electrical heating technique which characterized in that includes: a variable working condition unit, a main transformer and a high-speed plant,
the main transformer is electrically connected with the variable working condition unit through a bus, and the high-power transformer is electrically connected with the bus;
the auxiliary power consumption device is electrically connected with the high-power plant, and comprises an electric heating system.
2. The peak shaver system according to claim 1, wherein the electric heating system comprises an electric heating device and a heating means,
the electric heating device includes an electric heater;
the heating device comprises a heating water supply mechanism;
the high-voltage transformer is connected with a first power supply circuit;
the electric heater is arranged on the heating water supply mechanism, and the variable working condition unit is connected with the heating water supply mechanism; the high power transformer is electrically connected with the electric heater through the first power supply circuit.
3. The peak shaving system of claim 2, wherein the heating water feed mechanism comprises a high pressure heater, a valve body assembly, and a tube;
the pipe fitting comprises a first water outlet pipe and a second water outlet pipe,
the inlet of the first water outlet pipe is communicated with the outlet of the boiler separator, and the inlet of the second water outlet pipe is communicated with the outlet of the deaerator; the outlet of the first water outlet pipe and the outlet of the second water outlet pipe are communicated with the inlet of the boiler economizer;
the electric heater is arranged on the first water outlet pipe, the inlet of the electric heater is communicated with the outlet of the boiler separator, and the outlet of the electric heater is communicated with the inlet of the boiler economizer;
the high-pressure heater is arranged on the second water outlet pipe, an inlet of the high-pressure heater is communicated with an outlet of the deaerator, and an outlet of the high-pressure heater is communicated with an inlet of the boiler economizer;
the valve body assembly includes a first valve body;
the first valve body is communicated with the first water outlet pipe between the outlet of the electric heating system and the inlet of the boiler economizer.
4. The peak shaver system according to claim 3, wherein the tube further comprises a bypass tube,
the bypass pipe comprises a first end and a second end, the first end is communicated with the first water outlet pipe between the inlet of the electric heater and the outlet of the boiler separator, and the second end is communicated with the second water outlet pipe between the outlet of the high-pressure heater and the inlet of the boiler economizer;
the valve body assembly further comprises a second valve body, a third valve body and a fourth valve body,
the second valve body is communicated with the second water outlet pipe between the inlet of the boiler economizer and the second end,
the third valve body is communicated with the bypass pipe,
the fourth valve body is communicated with the first water outlet pipe between the outlet of the boiler separator and the first end.
5. The peak shaver system according to claim 2, wherein,
the heating device also comprises an air supply mechanism;
the electric heating equipment further comprises an electric heater;
the high-voltage transformer is also connected with a second power supply circuit;
the electric radiator is arranged on the air supply mechanism, and the variable working condition unit is communicated with the air supply mechanism; the high power transformer is connected with the electric heater through the second power supply circuit.
6. The peak shaving system of claim 5, wherein the blower mechanism comprises a blower, a steam assembly, and an air preheater;
the air supply outlet of the air feeder is communicated with the inlet of the steam assembly, and the outlet of the steam assembly is communicated with the inlet of the air preheater;
the electric heater is communicated between the inlet of the air preheater and the outlet of the steam assembly.
7. The peak shaver system according to claim 6, wherein the steam assembly comprises a steam heater, an auxiliary steam box and an auxiliary steam valve,
the inlet of the steam heater is communicated with the outlet of the blower, and the outlet of the steam heater is communicated with the inlet of the electric heater;
the steam heater further comprises an input port, the input port is communicated with the auxiliary steam box through an auxiliary steam pipe, and the auxiliary steam valve is communicated with the auxiliary steam pipe between the input port and the auxiliary steam box.
8. The peak shaving system according to claim 4, wherein the first water outlet pipe is provided with a circulating pump, an inlet of the circulating pump is communicated with an outlet of the boiler separator, and an outlet of the circulating pump is communicated with the first end and an inlet of the electric heater.
9. A peak shaver system according to claim 3, wherein the second water outlet pipe is provided with a water feed pump, the inlet of which is in communication with the outlet of the deaerator, and the outlet of which is in communication with the inlet of the high-pressure heater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321177294.6U CN220451990U (en) | 2023-05-12 | 2023-05-12 | Thermal power generating unit depth peak regulation system adopting electric heating technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321177294.6U CN220451990U (en) | 2023-05-12 | 2023-05-12 | Thermal power generating unit depth peak regulation system adopting electric heating technology |
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| CN220451990U true CN220451990U (en) | 2024-02-06 |
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| CN202321177294.6U Active CN220451990U (en) | 2023-05-12 | 2023-05-12 | Thermal power generating unit depth peak regulation system adopting electric heating technology |
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| Country | Link |
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| CN (1) | CN220451990U (en) |
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