CN217813611U - System for rapidly improving load response rate of thermal power generating unit based on heat storage tank - Google Patents
System for rapidly improving load response rate of thermal power generating unit based on heat storage tank Download PDFInfo
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- CN217813611U CN217813611U CN202221601479.0U CN202221601479U CN217813611U CN 217813611 U CN217813611 U CN 217813611U CN 202221601479 U CN202221601479 U CN 202221601479U CN 217813611 U CN217813611 U CN 217813611U
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Abstract
The utility model discloses a system for promote thermal power generating unit load response speed fast based on heat accumulation jar, including high pressure jar, intermediate pressure jar, low-pressure cylinder and the generator that connects in order, the output of low pressure jar is connected with eight low pressure heaters, seven low pressure heaters, six low pressure heaters, five low pressure heaters and condenser respectively, the output of condenser through condensate pump in order with eight low pressure heaters, seven low pressure heaters, six low pressure heaters, five low pressure heaters intercommunication setting, the end connection oxygen-eliminating device of five low pressure heaters; the first end and the last end of the eighth low-pressure heater and the fifth low-pressure heater are communicated with a heat storage tank in parallel, and the output end of the heat storage tank is communicated to the outlet end of the condensate pump through a heat storage tank circulating pump. The utility model discloses a set up the heat accumulation jar, overcome the restriction of the adjustable flow of oxygen-eliminating device, condenser water level, condensate water and time, improved the supplementary frequency modulation's of condensate water regulation efficiency, further promoted unit load response speed.
Description
Technical Field
The utility model relates to a thermal power generation technical field especially relates to a system that can promote thermal power unit load response speed fast.
Background
In recent years, under the vigorous guidance of national policies, renewable energy in China keeps a situation of continuous and rapid development. With the large amount of grid connection of new energy power generation, an electric power system faces huge peak load regulation pressure, and the flexibility of a thermal power generating unit occupies the main position of the flexibility of a future power supply according to the power supply structure of China. In the thermal power generating unit, the load climbing rate of the thermal power generating unit is a key index of thermal power flexibility, and the thermal power generating unit can achieve the aim of rapidly lifting the load only by fully responding to fluctuation change of a power system. How to improve the load response rate of the thermal power generating unit to the maximum is one of important contents of thermal power flexibility improvement.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs solve provides a system based on thermal storage tank promotes thermal power generating unit load response speed fast to overcome the restriction of oxygen-eliminating device, condenser water level, the adjustable flow of condensate and time, further improve the regulation efficiency of the supplementary frequency modulation of condensate, promote unit load response speed.
In order to solve the technical problem, the utility model adopts the following technical proposal.
The system comprises a high-pressure cylinder, an intermediate-pressure cylinder, a low-pressure cylinder and a generator which are connected in sequence, wherein the output end of the low-pressure cylinder is respectively connected with an eight low-pressure heater, a seven low-pressure heater, a six low-pressure heater, a five low-pressure heater and a condenser through pipelines, the output end of the condenser is communicated with the eight low-pressure heater, the seven low-pressure heater, the six low-pressure heater and the five low-pressure heater in sequence through a condensate pump, and the tail end of the five low-pressure heater is connected with a deaerator; the first end and the last end of the eighth low-pressure heater and the fifth low-pressure heater are communicated with a heat storage tank in parallel through pipelines, and the output end of the heat storage tank is communicated to the outlet end of the condensate pump through a heat storage tank circulating pump.
According to the system for rapidly improving the load response rate of the thermal power generating unit based on the heat storage tank, the outlet of the condensed water pump is communicated with the lower part of the heat storage tank through the low-temperature inlet valve of the heat storage tank, and the upper part of the heat storage tank is communicated with the outlet end of the fifth low-pressure heater through the high-temperature inlet valve of the heat storage tank; an inlet of a circulating pump of the heat storage tank is connected to the bottom of the heat storage tank, and an outlet of the circulating pump of the heat storage tank is communicated with the bottom end of an outlet of the condensate pump through an outlet valve of the circulating pump of the heat storage tank; and the outlet end of the heat storage tank circulating pump is communicated with the outlet end of the heat storage tank low-temperature inlet valve through a heat storage tank circulating pump recirculation valve.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses use the heat storage tank to realize, according to the regulation instruction, through the flow that the heat storage tank changed the condensate water in the unit, improved the regulation efficiency of the supplementary frequency modulation of condensate water, both overcome the restriction of the adjustable flow of oxygen-eliminating device, condenser water level, condensate water and time, promoted unit load response speed, improved the utilization ratio of non-heat supply period heat storage tank again. Compared with the operation effect of the traditional thermal power generating unit, the load response rate of the unit is at least improved by 0.43MW/min, the lifting proportion is 7.2% (taking 350MWMW as an example), the adjustment limitation caused by the water level of a deaerator, the water level of a condensate hot well and the like in the condensate throttling process is reduced, and the adjustment effect is improved.
Drawings
Fig. 1 is a schematic structural diagram of the system of the present invention.
Fig. 2 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the following detailed description.
In the conventional condensed water throttling process of the thermal power generating unit, the water level of a deaerator and the water level of a hot well of the condenser need to be guaranteed to fluctuate within a reasonable range, and the condensed water throttling control process is interfered according to the deviation of the real-time water level of the deaerator and the set value water level, so that the condensed water throttling frequency modulation action rate and the response efficiency are low.
Along with the implementation of the thermoelectric decoupling transformation, more and more power plants adopt the thermoelectric decoupling mode of the heat storage tank, and the construction of the large-scale heat storage tank also creates favorable conditions for developing the condensate water auxiliary frequency modulation technology by utilizing the heat storage tank. The heat storage tank is put into use in the heat supply period, but is idle in the non-heat supply period, so that the waste of resources is caused. The utility model discloses when non-heat supply period, combine together through heat accumulation jar and condensate water throttling technique, improve the restriction of oxygen-eliminating device and condenser water level to the condensate water throttle, both improved the rate of utilization of heat accumulation jar, avoid equipment idle, can improve the supplementary frequency modulation's of condensate water regulation efficiency again, promoted unit load response speed.
Therefore, the utility model provides a system based on thermal storage tank promotes thermal power unit load response speed fast solves the restriction factor of condensate water throttle frequency modulation in-process, further improves unit load response speed.
The utility model provides a system based on quick promotion thermal power generating unit load change rate of heat accumulation jar, its structure is shown in figure 1, including high pressure cylinder 1, intermediate pressure cylinder 2, low pressure cylinder 3, generator 4, condenser 5, condensate pump 6, heat accumulation jar 7, heat accumulation jar circulating pump 8, no. eight low pressure heater 9, no. seven low pressure heater 10, no. six low pressure heater 11, no. five low pressure heater 12, oxygen-eliminating device 13, heat accumulation jar low temperature entry valve 14, heat accumulation jar high temperature entry valve 15, heat accumulation jar circulating pump outlet valve 16 and heat accumulation jar circulating pump recirculation valve 17.
The high pressure cylinder 1, the middle pressure cylinder 2, the low pressure cylinder 3 and the generator 4 are coaxially arranged, are positioned on the same horizontal plane and are sequentially connected; the inlet of the condensate pump is connected with the output end of the condenser, the outlet of the condensate pump is connected with the water side inlet of the eighth low-pressure heater and sequentially connected with the seventh low-pressure heater, the sixth low-pressure heater and the fifth low-pressure heater, and the outlet of the fifth low-pressure heater is connected with the inlet of the deaerator 13.
An outlet of the condensate pump 6 is connected with the lower part of the heat storage tank through a low-temperature inlet valve 14 of the heat storage tank, and the upper part of the heat storage tank is connected with an inlet of the deaerator through a high-temperature inlet valve 15 of the heat storage tank; 8 import connections of heat accumulation jar circulating pump 7 bottoms, and 8 exports of heat accumulation jar circulating pump link to each other with the export of condensate pump 6 through heat accumulation jar circulating pump outlet valve 16, and heat accumulation jar circulating pump recirculation valve 17 exports from heat accumulation jar circulating pump 8 and links to each other with the export of heat accumulation jar low temperature entry valve 14.
In the utility model, high-temperature and high-pressure steam enters the condenser 5 to be condensed into water after acting through the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder; the condensed water is heated by an eighth low-pressure heater, a seventh low-pressure heater, a sixth low-pressure heater and a fifth low-pressure heater in sequence and then is sent into a deaerator for sample discharging treatment and then is used. When the unit load in the system changes, the condensate flow can be adjusted by adjusting the opening and closing states of the heat storage tank low-temperature inlet valve 14, the heat storage tank high-temperature inlet valve 15, the heat storage tank circulating pump outlet valve 16 and the heat storage tank circulating pump recirculation valve 17, so that the quick response to the unit load is further realized.
The utility model is used for a flow when adjusting thermal power unit load change rate is shown in fig. 2, specifically includes following step.
S1, monitoring a unit load instruction and an actual load in real time, and calculating a difference value of the unit load instruction and the actual load to obtain a power deviation value.
And S2, when the difference value between the monitored load instruction and the actual load reaches the preset condition of condensate throttling, inputting the power deviation value into a condensate throttling control model of the unit to generate the condensate throttling quantity.
In this embodiment, taking a certain 350MW supercritical unit as an example, the preset conditions for the condensate throttling are shown in table 1.
TABLE 1
The unit condensed water throttling control model in the step analyzes the energy change of each level of low-pressure heater by using an equivalent enthalpy drop method, and deduces the relation between the unit power change rate and the condensed water throttling according to the energy conservation principle:
ΔN E ＝k cw ΔQ cw
in the formula,. DELTA.N E The unit power change rate, MW; k is a radical of cw The throttling gain of the condensed water to the unit power under the unit flow is MW/kg; delta Q cw The flow rate of the condensed water is regulated in kg/s.
Quantitative analysis is carried out on the regenerative heating system by the unit under different heat consumption working conditions, the corresponding relation between the change rate of the flow of the condensed water and the load of the unit is obtained, and throttling gains under different working conditions are obtained. Continuing the above example, when the water diversion rated flow of the 350MW supercritical unit is 520t/h, the value is 0.031, and the water diversion flow is controlled at 30% -100% rated flow.
The relationship between the actual load change rate of the unit and the set load change rate is that,
in the formula, V1 is the actual load change rate of the unit, and V is the set load change rate of the unit, MW/min; n1 is the initial value of the load change, N2 is the target value of the load change, MW.
The flow-saving quantity of the condensed water can be obtained,
and S3, after the generated throttle amount of the condensed water is judged by the high-low limiting signal, the change of the flow rate of the condensed water output by the low-pressure heater is adjusted by controlling a low-temperature inlet valve of the heat storage tank, a high-temperature inlet valve of the heat storage tank, an outlet valve of a circulating pump of the heat storage tank and a recirculating valve of a circulating pump of the heat storage tank, so that the steam extraction amount of the low-pressure cylinder is changed, and the power value of the unit is further changed.
In the step, when a unit load instruction rises, a condensed water throttling reduction instruction is received, opening instructions of a heat storage tank low-temperature inlet valve 14 and a heat storage tank high-temperature inlet valve 15 are generated, the heat storage tank low-temperature inlet valve 14 and the heat storage tank high-temperature inlet valve 15 are opened according to the opening instructions, low-temperature condensed water enters a heat storage tank 7, high-temperature condensed water on the upper portion of the heat storage tank enters a deaerator 13 through the heat storage tank high-temperature inlet valve, the steam extraction amount of a low-pressure cylinder 3 is reduced, the unit load is improved, meanwhile, the balance of water entering the deaerator is guaranteed, and the water level of the deaerator is kept unchanged; and when the load is stable, the low-temperature inlet valve and the high-temperature inlet valve of the heat storage tank are closed at a set speed. In the instruction execution process, the recirculation valve of the circulating pump of the heat storage tank is kept unchanged, and the recirculation minimum flow of the circulating pump is kept.
When the unit load instruction is reduced, receiving a condensed water increase and throttling instruction, generating a heat storage tank circulating pump outlet valve 16, a heat storage tank high-temperature inlet valve 15 and a heat storage tank circulating pump recirculation valve 17 opening and closing instruction, opening the heat storage tank circulating pump outlet valve 16 and the heat storage tank high-temperature inlet valve 15, closing the heat storage tank circulating pump recirculation valve 17, enabling low-temperature condensed water to enter an outlet of a condensed water pump, increasing the flow of the condensed water passing through a low-pressure heater, increasing the steam extraction amount of a low-pressure cylinder, improving the unit load, ensuring the balance of the water entering a deaerator, and keeping the water level of the deaerator unchanged; and after the load of the unit is stable, the outlet valve of the circulating pump of the heat storage tank and the high-temperature inlet valve of the heat storage tank are closed at a set speed, and the recirculation valve of the circulating pump of the heat storage tank is opened to a preset value.
Continuing the embodiment, when the load change rate of the original unit of the supercritical 350MW unit is 6MW/min, and the unit is reduced to 105MW from the load of 350MW, condensed water is divided into the heat storage tanks, the water distribution flow of the heat storage tanks is 520.82t/h, the average load reduction change rate of the unit is 6.43MW/min, the load reduction change rate is improved by 0.43MW/min, and the load response rate of the unit is improved by 7.2%.
The specific calculation process is shown in table 2.
TABLE 2
Claims (2)
1. System based on thermal storage tank promotes thermal power unit load response rate fast, its characterized in that: the device comprises a high-pressure cylinder (1), an intermediate-pressure cylinder (2), a low-pressure cylinder (3) and a generator (4) which are connected in sequence, wherein the output end of the low-pressure cylinder (3) is respectively connected with an eight low-pressure heater (9), a seven low-pressure heater (10), a six low-pressure heater (11), a five low-pressure heater (12) and a condenser (5) through pipelines, the output end of the condenser (5) is sequentially communicated with the eight low-pressure heater (9), the seven low-pressure heater (10), the six low-pressure heater (11) and the five low-pressure heater (12) through a condensate pump (6), and the tail end of the five low-pressure heater (12) is connected with a deaerator (13); the heat storage tank (7) is communicated with the first end and the last end of the eighth low-pressure heater (9) and the fifth low-pressure heater (12) in parallel through pipelines, and the output end of the heat storage tank (7) is communicated to the outlet end of the condensate pump (6) through a heat storage tank circulating pump (8).
2. The system for rapidly increasing the load response rate of the thermal power generating unit based on the heat storage tank as claimed in claim 1, wherein: an outlet of the condensed water pump (6) is communicated with the lower part of the heat storage tank (7) through a heat storage tank low-temperature inlet valve (14), and the upper part of the heat storage tank (7) is communicated with an outlet end of a fifth low-pressure heater (12) through a heat storage tank high-temperature inlet valve (15); an inlet of a circulating pump (8) of the heat storage tank is connected to the bottom of the heat storage tank (7), and an outlet of the circulating pump (8) of the heat storage tank is communicated with the bottom end of an outlet of the condensate pump through an outlet valve (16) of the circulating pump of the heat storage tank; the outlet end of the heat storage tank circulating pump (8) is communicated with the outlet end of the heat storage tank low-temperature inlet valve (14) through a heat storage tank circulating pump recirculation valve (17).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116667383A (en) * | 2023-05-30 | 2023-08-29 | 中国电力工程顾问集团有限公司 | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116667383A (en) * | 2023-05-30 | 2023-08-29 | 中国电力工程顾问集团有限公司 | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method |
| CN116667383B (en) * | 2023-05-30 | 2023-11-14 | 中国电力工程顾问集团有限公司 | Heat pump and low-adding coupling thermal power generating unit frequency modulation system and method |
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