CN111706846A - System for adjusting heat supply peak valley by utilizing energy storage of high-pressure heater and operation mode - Google Patents
System for adjusting heat supply peak valley by utilizing energy storage of high-pressure heater and operation mode Download PDFInfo
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- CN111706846A CN111706846A CN202010705075.5A CN202010705075A CN111706846A CN 111706846 A CN111706846 A CN 111706846A CN 202010705075 A CN202010705075 A CN 202010705075A CN 111706846 A CN111706846 A CN 111706846A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 315
- 238000000605 extraction Methods 0.000 claims abstract description 69
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims description 103
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000006392 deoxygenation reaction Methods 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 239000008236 heating water Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 239000005871 repellent Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
- F22D1/325—Schematic arrangements or control devices therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a system for regulating heat supply peak valley by utilizing energy storage of a high-pressure heater, which comprises a back pressure turbine, a deaerator, the high-pressure heater, a water tank and a boiler, wherein the back pressure turbine is connected with the deaerator; the back pressure steam turbine is connected with a back pressure steam pipe; the steam boiler is characterized in that a water supply main pipe is connected to the deaerator, a first water supply pipe is connected between the deaerator and the high-pressure heater, a steam extraction pipe is connected between the high-pressure heater and the back pressure steam turbine, a second water supply pipe is connected between the high-pressure heater and the water tank, a third water supply pipe is connected between the high-pressure heater and the boiler, and a steam supply pipe is connected between the boiler and the back pressure steam turbine. And adjusting the operation modes of the heat supply peak-valley system, including a valley operation mode S1 and a peak operation mode S2. The system has the advantages of stable operation load, high operation efficiency and strong heat supply capacity.
Description
Technical Field
The invention relates to the technical field of power stations, in particular to a power station energy storage and heat supply system.
Background
Due to the development of the society and the implementation of various policies for energy conservation and emission reduction in China, cogeneration of heat and power in a thermal power plant becomes a main production mode for central heating. In order to further improve the thermal efficiency, most of the steam extraction units of the thermal power plant are further replaced by the backpressure unit, a plurality of steam extraction units of the thermal power plant which completely stop the peak shaving mode are available, and the heat supply is completely completed by the backpressure unit and the double reduction.
However, the heat load of most heat supply zones is unstable. They are characterized by peaks (maximum heat use period) from 8 to 11 am and troughs (minimum heat use period) from 23 to 6 pm. When the peak-to-valley ratio exceeds 200% (average steam consumption at peak/average steam consumption at valley), great inconvenience is brought to system operation, not only the unit efficiency is low, but also the environmental-friendly denitration is difficult to reach the standard.
Therefore, how to improve the existing power station heating system to overcome the above problems is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an energy storage regulation heat supply peak-valley system utilizing a high-pressure heater, which has the advantages of stable operation load, high operation efficiency and strong heat supply capacity when the heat supply peak-valley ratio is large.
Another object of the present invention is to provide a method for regulating the operation of a peak-valley heating system by utilizing the stored energy of a high-pressure heater.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a system for regulating heat supply peak valley by utilizing energy storage of a high-pressure heater comprises a back pressure turbine, a deaerator, the high-pressure heater, a water tank and a boiler;
the back pressure steam turbine is connected with a back pressure steam pipe, the back pressure steam pipe is divided into two paths, one path of the back pressure steam pipe is suitable for being connected with a heat supply main pipe and used for conveying back pressure steam to supply heat, and the other path of the back pressure steam pipe is connected with the deaerator and used for conveying the back pressure steam to heat the salt-free water;
the deaerator is connected with a water supply main pipe, the water supply main pipe conveys salt-free water to the deaerator, a first water supply pipe is connected between the deaerator and the high-pressure heater, and the first water supply pipe is used for conveying the deaerated salt-free water prepared by the deaerator to a water chamber of the high-pressure heater; the first water supply pipe is provided with a control part, and the control part is used for adjusting the pressure and the water quantity of the deoxygenated salt-free water entering the high-pressure heater from the deoxygenator;
a steam extraction pipe is connected between the high-pressure heater and the backpressure steam turbine, and the steam extraction pipe conveys steam to a steam chamber of the high-pressure heater and is used for heating deoxygenated salt-free water in a water chamber of the high-pressure heater;
a second water supply pipe is connected between the high-pressure heater and the water tank and can convey the deoxygenated salt-free water in the water chamber of the high-pressure heater to the water tank;
a third water supply pipe is connected between the high-pressure heater and the boiler and can convey the deoxidized salt-free water in the water chamber of the high-pressure heater to the boiler; the second water supply pipe is communicated with the third water supply pipe, and the deoxygenated and saltless water in the water tank can enter the boiler through the second water supply pipe and the third water supply pipe;
a steam supply pipe is connected between the boiler and the back pressure turbine, the boiler heats the deoxidized salt-free water into steam, and the steam is conveyed to the back pressure turbine through the steam supply pipe;
still be connected with first drain pipe between high pressure feed water heater with the oxygen-eliminating device, the steam in the high pressure feed water heater steam chamber passes through after the condensation first drain pipe flows into the oxygen-eliminating device.
As an improvement, the high-pressure heater comprises a first pumping high-pressure heater and a second pumping high-pressure heater, the outlet water temperature of the first pumping high-pressure heater is higher than the outlet water temperature of the second pumping high-pressure heater, the steam extraction pipe comprises a steam extraction pipe and two steam extraction pipes, and the steam outlet pressure of the first steam extraction pipe is higher than the steam outlet pressure of the second steam extraction pipe; the two-pumping high-pressure heater can convey deoxygenated salt-free water to the one-pumping high-pressure heater.
The two high-pressure pumping heaters are connected with the two steam extraction pipes, the first water supply pipe and the first drain pipe, the one high-pressure pumping heater is connected with the one steam extraction pipe, the second water supply pipe and the third water supply pipe, the second drain pipe is further connected between the one high-pressure pumping heater and the two high-pressure pumping heaters, and steam in the steam chamber of the one high-pressure pumping heater is condensed and then flows into the steam chamber of the two high-pressure pumping heaters through the second drain pipe. By two-stage heating, the deoxygenated saltless water can be heated to a higher rated temperature to improve energy utilization.
The improved water heater is characterized in that a desuperheater is arranged between the two pumping high-pressure heaters and the first pumping high-pressure heater, a fourth water supply pipe is connected between the two pumping high-pressure heaters and the desuperheater, a fifth water supply pipe is connected between the desuperheater and the first pumping high-pressure heater, deoxygenation saltless water in the water chamber of the two pumping high-pressure heaters enters the water chamber of the desuperheater through the fourth water supply pipe, and deoxygenation saltless water in the water chamber of the desuperheater enters the water chamber of the first pumping high-pressure heater through the fifth water supply pipe.
A steam balance pipe is connected between the top of the water tank and the steam chamber of the desuperheater, the steam extraction pipe is also connected with the steam chamber of the desuperheater, steam in the steam extraction pipe is cooled to saturation temperature through the desuperheater, and saturated steam enters the top of the water tank through the steam balance pipe. The main function of the desuperheater is to reduce the use temperature of the water tank.
Preferably, a third drain pipe is connected between the desuperheater and the first high-pressure extraction heater, the desuperheater is arranged higher than the first high-pressure extraction heater, and steam in a steam chamber of the desuperheater is condensed and then flows into the steam chamber of the first high-pressure extraction heater through the third drain pipe.
As a conventional arrangement, the control part comprises a variable-speed pressurizing water pump and a regulating valve, wherein the variable-speed pressurizing water pump is used for controlling the pressure of the deoxygenated saltless water, and the regulating valve is used for controlling the flow of the deoxygenated saltless water;
a bidirectional flowmeter is arranged on the second water supply pipe and is used for monitoring the amount of deoxygenated and saltless water entering and exiting the water tank;
and a boiler water feeding pump is arranged on the third water supply pipe and used for conveying deoxygenated salt-free water to the boiler in a pressurized mode.
The operation mode of the heat supply peak-valley system is adjusted by utilizing the stored energy of the high-pressure heater, and comprises a valley operation mode S1 and a peak operation mode S2;
in the valley-time heating period, the valley-time operation mode S1 includes the steps of:
s11: the deaerator is used for preparing deaerated salt-free water, and the amount of the prepared deaerated salt-free water is larger than that of water required by a boiler;
s12: heating the deoxygenated water by a high-pressure heater to reach a rated water temperature;
in the steps, the self-steam consumption of the deaerator and the high-pressure heater is increased, and the load of the unit is improved.
S13: extracting the required high-temperature deoxygenation salt-free water by the boiler, and feeding the residual high-temperature deoxygenation salt-free water into a water tank for storage;
in the peak heating period, the peak time operation mode S2 includes the following steps:
s21: the deaerator reduces the preparation of deaerated non-salt water, and the heating water amount of the high-pressure heater is reduced; the steam consumption of the system is further reduced, and the saved steam enters a heat supply main pipe for heat supply;
s22: the boiler can extract high-temperature deoxygenation salt-free water stored in the water tank while extracting high-temperature deoxygenation salt-free water prepared by the high-pressure heater so as to meet the water quantity required by the boiler.
As an improvement, the high-pressure heater of the system comprises a first pumping high-pressure heater and a second pumping high-pressure heater, wherein the first pumping high-pressure heater has an ultrahigh-pressure heating function, the second pumping high-pressure heater has a high-pressure heating function, the first pumping high-pressure heater is connected with the backpressure steam turbine through a steam extraction pipe, and the second pumping high-pressure heater is connected with the backpressure steam turbine through a steam extraction pipe; in the step S12, the deoxygenated water is sequentially heated by the two-pumping high-pressure heater and the one-pumping high-pressure heater to reach the rated temperature.
Furthermore, a desuperheater is arranged between the first pumping high-pressure heater and the second pumping high-pressure heater, and deoxygenated salt-free water in the second pumping high-pressure heater passes through the desuperheater and then enters the first pumping high-pressure heater; the steam balance pipe is connected between the water tank and the desuperheater, the steam balance pipe is connected with a steam extraction pipe through the desuperheater, steam in the steam extraction pipe is cooled to a saturation temperature through the desuperheater, and the saturated steam enters the top of the water tank through the steam balance pipe and is used for reducing the service temperature of the water tank.
As a conventional control method, in the above step S11, the supply amount of the deoxygenated and non-saline water is increased by the variable-speed pressurizing water pump, and the water pressure is adjusted to be greater than the steam pressure of a steam extraction pipe, and the water supply amount is adjusted to be greater than the water amount required by the boiler by adjusting the opening degree of the adjusting valve.
Preferably, the operation mode further includes a condensation and drainage step S3: a third drain pipe is connected between the desuperheater and the first high-pressure pumping heater, a second drain pipe is also connected between the first high-pressure pumping heater and the second high-pressure pumping heater, and a first drain pipe is also connected between the high-pressure heater and the deaerator; the condensed water in the desuperheater flows into the first pumping high-pressure heater due to the height difference, the condensed water in the first pumping high-pressure heater flows into the second pumping high-pressure heater due to the pressure difference, and the condensed water in the second pumping high-pressure heater flows into the deaerator due to the pressure difference and is recycled.
In the prior art, the main production process of the heat supply unit is that a boiler generates high-temperature high-pressure steam, the high-pressure steam generates electricity through a backpressure steam turbine and forms low-pressure steam after pressure reduction, one part of the low-pressure steam supplies heat, the other part of the low-pressure steam is used for feed water heating and deoxidization of the boiler, and the low-pressure steam is heated at high temperature after deoxidization and reaches the feed water temperature required by the boiler, and then enters the boiler again. That is, the heating capacity of a set of heat supply units can be equal to that the steam yield of the boiler (i.e. the steam inlet of the back pressure turbine) is subtracted by the steam amount for deoxidizing and heating and then by the steam amount for high-temperature heating.
Compared with the prior art, the invention improves the water supply and steam supply pipelines of the heat supply unit, and adopts different operation modes in peak-valley time periods, which specifically comprises the following steps: in the valley period (such as night), the deoxygenated salt-free water is heated to the rated temperature by using a high-pressure heater and stored in a spherical water tank, and the self-steam consumption of the unit is increased to improve the load of the unit; and the high-temperature deoxygenation salt-free water stored in the water tank is mainly used in the peak period of heat supply (such as daytime), the deoxygenation salt-free water is not heated or is heated less, the self-steam consumption of the unit is reduced, the heat supply capacity of the unit is also improved, and the heat supply requirement is met. By the operation mode, the unit can run in a small-range fluctuation balance mode all day long, the operation efficiency of the unit is improved, and the heat supply capacity of the unit in a peak period is improved.
It is worth mentioning that, this system has utilized high pressure feed water heater, can heat deoxidization no salt solution to 245 ℃ (super high pressure high temperature unit) or 215 ℃ (high temperature high pressure unit), can improve the thermal efficiency of unit greatly to the rate of utilization of full play unit improves energy utilization on the whole, has energy-concerving and environment-protective advantage.
Drawings
Fig. 1 is a schematic diagram of a system architecture according to a preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., it indicates that the orientation and positional relationship shown in the drawings are based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated without limiting the specific scope of protection of the present invention.
As shown in fig. 1, the energy storage and heat supply system according to a preferred embodiment of the present invention includes a back pressure turbine 1, a deaerator 2, a two-stage high pressure heater 3, a one-stage high pressure heater 4, a water tank 5, a boiler 6, and a desuperheater 7, and the devices are connected to each other through a steam pipe, a water supply pipe, and a drain pipe, and the specific structure is as follows:
the back pressure steam turbine 1 is connected with a back pressure steam pipe 8, the back pressure steam pipe 8 is divided into two paths, one path of back pressure steam pipe 8 is suitable for being connected with a heat supply main pipe and conveying back pressure steam for supplying heat, and the other path of back pressure steam pipe 8 is connected with the deaerator 2 and conveying the back pressure steam for heating salt-free water.
The deaerator 2 is connected with a water supply header pipe 9, the water supply header pipe 9 conveys salt-free water to the deaerator 2, a first water supply pipe 10 is connected between the deaerator 2 and the two pumping high-pressure heaters 3, and the first water supply pipe 10 is used for conveying the deaerated salt-free water prepared by the deaerator 2 to water chambers of the two pumping high-pressure heaters 3; the first water supply pipe 10 is provided with a control component, and the control component is used for adjusting the pressure and the water quantity of deoxygenated saltless water entering the two-pumping high-pressure heater 3 by the deoxygenator 2. The control component comprises a variable-speed pressurizing water pump 101 and a regulating valve 102, wherein the variable-speed pressurizing water pump 101 is used for controlling the water pressure of the oxygen-removing salt-free water, and the regulating valve 102 is used for controlling the water flow of the oxygen-removing salt-free water.
A second steam extraction pipe 11 is connected between the second extraction high-pressure heater 3 and the backpressure steam turbine 1, and the second steam extraction pipe 11 conveys steam to a steam chamber of the second extraction high-pressure heater 3 and is used for heating deoxygenated salt-free water in a water chamber of the second extraction high-pressure heater 3; an extraction pipe 12 is connected between the high-pressure extraction heater 4 and the back pressure turbine 1, and the extraction pipe 12 is used for conveying steam to a steam chamber of the high-pressure extraction heater 4 and heating deoxygenated salt-free water in a water chamber of the high-pressure extraction heater 4. The water outlet temperature of the first pumping high-pressure heater 4 is higher than that of the second pumping high-pressure heater 3, and the steam outlet pressure of the first steam extraction pipe 12 is higher than that of the second steam extraction pipe 11; the two-pump high-pressure heater 3 can convey deoxygenated salt-free water to the one-pump high-pressure heater 4.
A second water supply pipe 13 is connected between the high pressure pumping heater 4 and the water tank 5, and the second water supply pipe 13 can convey the deoxidized salt-free water in the water chamber of the high pressure pumping heater 4 to the water tank 5. A two-way flow meter 131 is provided on the second water supply pipe 13, the two-way flow meter 131 being used to monitor the amount of deoxygenated, saltless water entering and exiting the water tank 5.
A third water supply pipe 14 is connected between the high-pressure pumping heater 4 and the boiler 6, and the third water supply pipe 14 can convey the deoxidized salt-free water in the water chamber of the high-pressure pumping heater 4 to the boiler 6; and the second water supply pipe 13 is communicated with the third water supply pipe 14, and the oxygen-removed and salt-free water in the water tank 5 can be introduced into the boiler 6 through the second water supply pipe 13 and the third water supply pipe 14. A boiler feed water pump 141 is provided on the third water supply pipe 14, and the boiler feed water pump 141 is used to pressure-feed the oxygen-removed and salt-free water to the boiler 6.
The desuperheater 7 is arranged between the two-pumping high-pressure heater 3 and the one-pumping high-pressure heater 4, a fourth water supply pipe 15 is connected between the two-pumping high-pressure heater 3 and the desuperheater 7, a fifth water supply pipe 16 is connected between the desuperheater 7 and the one-pumping high-pressure heater 4, the oxygen-removing salt-free water in the water chamber of the two-pumping high-pressure heater 3 enters the water chamber of the desuperheater 7 through the fourth water supply pipe 15, and the oxygen-removing salt-free water in the water chamber of the desuperheater 7 enters the water chamber of the one-pumping high-pressure.
A steam supply pipe 17 is connected between the boiler 6 and the back pressure turbine 1, and the boiler 6 heats the deoxidized salt-free water into steam and transmits the steam to the back pressure turbine 1 through the steam supply pipe 17.
A steam balance pipe 18 is connected between the top of the water tank 5 and the steam chamber of the desuperheater 7, a steam extraction pipe 12 is also connected with the steam chamber of the desuperheater 7, steam in the steam extraction pipe 12 is cooled to saturation temperature through the desuperheater 7, and saturated steam enters the top of the water tank 5 through the steam balance pipe 18.
In order to recycle the condensed steam, a first drain pipe 19 is connected between the second high-pressure pumping heater 3 and the deaerator 2, a second drain pipe 20 is connected between the first high-pressure pumping heater 4 and the second high-pressure pumping heater 3, a third drain pipe 21 is connected between the desuperheater 7 and the first high-pressure pumping heater 4, and the desuperheater 7 is higher than the first high-pressure pumping heater 4 and is arranged so as to drain water automatically.
With the structure, the basic working principle of the system is as follows:
the non-salt water is heated by a deaerator to be deaerated, enters a variable speed pressurizing water pump to be pressurized, is adjusted in flow rate by an adjusting valve, enters a water chamber of a two-pumping high-pressure heater, is heated by high-temperature steam in a two-pumping pipe, flows into the water chamber of a desuperheater, then enters the water chamber of the one-pumping high-pressure heater, is reheated by the high-temperature steam in the one-pumping pipe, flows out in two paths, flows to a boiler water supply pump, pressurizes the high-temperature deaerated non-salt water into a boiler, produces qualified steam to enter a backpressure steam turbine, and the other path is communicated with the bottom of a spherical water tank. In the system, a small part of backpressure steam (steam in the backpressure steam pipe) of a backpressure steam turbine (steam in a first steam extraction pipe) and a small part of backpressure steam (steam in the backpressure steam pipe) respectively enter a first high-pressure extraction heater, a second high-pressure extraction heater and a deaerator, and no salt water is heated in three steps, so that the heat regeneration efficiency of a unit can be improved; most of the backpressure steam enters the heat supply main pipe for heat supply.
Wherein, the top of the water tank is provided with a steam balance pipe which is connected with a steam extraction pipe through a desuperheater. Because the high-pressure pumping heater is a surface heater, the temperature of heated water is lower than the saturation temperature of steam in the heated steam extraction pipe, so that the water temperature in the water tank is lower than the saturation temperature of the steam at the upper part, namely the water has certain supercooling degree, can not be vaporized and can be stably stored in the water tank. Meanwhile, the water is not vaporized when the boiler feed water pump pumps the water, thereby avoiding the generation of cavitation. Because the saturated steam enters the water tank, the use temperature of the water tank can be greatly reduced, the manufacturing cost of the water tank is also reduced, and the safety and reliability of the water tank are improved.
Through the setting of three drain pipes, the comdenstion water in the desuperheater can flow into one through the third drain pipe and take out high pressure feed water heater in this system, and the comdenstion water in one taking out high pressure feed water heater can flow into two through the second drain pipe difference and take out high pressure feed water heater, and the comdenstion water in two taking out high pressure feed water heater can flow into the oxygen-eliminating device through first drain pipe difference. Because the desuperheater is higher than the first high-pressure heater, the first steam extraction pressure is greater than the second steam extraction pressure, and the second steam extraction pressure is greater than the working pressure of the deaerator, the condensed water can automatically flow in the drain pipe.
Based on the above system structure and basic working principle, the principle and operation mode for adjusting the peak and valley of heat supply of the embodiment are as follows:
in the valley period of heat supply, the variable-speed pressurizing water pump increases the water supply amount, adjusts the water pressure to be greater than the steam extraction pressure by 0.2 to 0.4MPa, adjusts the opening of the adjusting valve, adjusts the water amount to be greater than the water amount required by the boiler, and simultaneously, the deaerator also synchronously increases the water making amount and keeps the water level of the deaerating water tank relatively stable. The deoxidized non-salt water passes through a two-pump high-pressure heater, the one-pump high-pressure heater is heated for the second time to reach the rated water temperature, one part of water is sent to a boiler through a boiler water supply pump, and the other part of water enters a water tank through a two-way flowmeter to be stored. In the whole valley period, because the water production amount is larger than the water consumption amount, the self-steam consumption amount for heating at all levels is increased, and the unit load is increased.
In the peak period of heat supply, the variable-speed pressurizing water pump and the regulating valve reduce the water supply amount to be less than the water amount required by the boiler, and meanwhile, the deaerator also reduces the water making amount, and the insufficient part sends water to the inlet of the boiler water supply pump through the steam pressure at the top of the water tank and enters the boiler after pressurization. Because the new water supplement amount is reduced, and the self-steam consumption of each level of deoxidization, primary extraction and secondary extraction is reduced, the steam which is added out by the unit can be used for heat supply, and the heat supply capacity of the unit is improved.
By means of the system and the working mode thereof, specifically how to adjust what level can be reached, the following takes a set of ultrahigh pressure and high temperature backpressure unit of the applicant as an example to explain the situation:
main equipment parameters of the unit:
boiler: the rated pressure of the boiler is 13.7 MPa; the rated temperature is 540 ℃; the rated evaporation capacity is 150 tons/h, and the water supply temperature is 245 ℃.
Back pressure steam turbine: rated power 21300 KW; the steam inlet pressure is 13 MPa; the steam inlet temperature: 535 ℃; the rated steam inlet amount is 150 tons/hour; the primary steam extraction pressure is 4MPa, the primary steam extraction temperature is 380 ℃, and the primary steam extraction amount is 25 tons/hour; the secondary steam extraction pressure is 1.9MPa, the secondary steam extraction temperature is 280 ℃, and the secondary steam extraction amount is 25 tons/hour; the exhaust pressure is 0.8MPa, and the exhaust temperature is 205 ℃.
A deaerator: the water inlet temperature is 25 ℃, the water outlet temperature is 158 ℃, the maximum water yield is 300 tons/hour, and the steam inlet pressure is 0.58 MPa.
Two-pump high-pressure heater: the water inlet temperature is 158 ℃, the water outlet temperature is 200 ℃, the steam inlet pressure is 1.9MPa, and the maximum water yield is 260 tons/hour.
A pumping high-pressure heater: the water inlet temperature is 200 ℃, the water outlet temperature is 245 ℃, the steam inlet pressure is 4MPa, and the maximum water yield is 260 tons/hour.
A spherical water tank: nominal volume 1500m 3; the rated pressure is 4.5MPa, and the design temperature is 260 ℃.
The specific regulation peak-to-valley operating mode is shown in table 1:
TABLE 1
Specific conventional operating modes are shown in table 2:
TABLE 2
On the premise of a certain total heat load, as can be seen from the comparison of table 1 and table 2, in the conventional operation mode, two sets of units need to be operated in the peak time period, the average load rate is 67%, and the load rate of one set of units is only 41% in the valley time period, which is the minimum operable load of the set, so that a lot of problems are caused when the set is started and stopped every day, and the efficiency is low. After the peak-valley operation mode is adjusted, the unit can stably operate between 85% and 93% of load. And the maximum heat supply capacity of one set of the original unit is only 97 tons/hour in the peak period, and the maximum heat supply capacity of the set of the unit after peak regulation reaches 145 tons/hour in the peak period, so that the heat supply capacity is improved by 50 percent. When the system is designed, under the condition that the peak-time heat supply capacity is considered in priority by the construction scale of the whole plant, the construction scale can be reduced by about 40 percent by adopting the mode of adjusting the peak-valley operation, the utilization rate of the unit can be fully exerted, the construction investment is saved, and the heat efficiency of the unit is improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The utility model provides an utilize high pressure feed water heater's energy storage to adjust heat supply peak valley system which characterized in that: the system comprises a backpressure steam turbine, a deaerator, a high-pressure heater, a water tank and a boiler;
the back pressure steam turbine is connected with a back pressure steam pipe, the back pressure steam pipe is divided into two paths, one path of the back pressure steam pipe is suitable for being connected with a heat supply main pipe and used for conveying back pressure steam to supply heat, and the other path of the back pressure steam pipe is connected with the deaerator and used for conveying the back pressure steam to heat the salt-free water;
the deaerator is connected with a water supply main pipe, the water supply main pipe conveys salt-free water to the deaerator, a first water supply pipe is connected between the deaerator and the high-pressure heater, and the first water supply pipe is used for conveying the deaerated salt-free water prepared by the deaerator to a water chamber of the high-pressure heater; the first water supply pipe is provided with a control part, and the control part is used for adjusting the pressure and the water quantity of the deoxygenated salt-free water entering the high-pressure heater from the deoxygenator;
a steam extraction pipe is connected between the high-pressure heater and the backpressure steam turbine, and the steam extraction pipe conveys steam to a steam chamber of the high-pressure heater and is used for heating deoxygenated salt-free water in a water chamber of the high-pressure heater;
a second water supply pipe is connected between the high-pressure heater and the water tank and can convey the deoxygenated salt-free water in the water chamber of the high-pressure heater to the water tank;
a third water supply pipe is connected between the high-pressure heater and the boiler and can convey the deoxidized salt-free water in the water chamber of the high-pressure heater to the boiler; the second water supply pipe is communicated with the third water supply pipe, and the deoxygenated and saltless water in the water tank can enter the boiler through the second water supply pipe and the third water supply pipe;
a steam supply pipe is connected between the boiler and the back pressure turbine, the boiler heats the deoxidized salt-free water into steam, and the steam is conveyed to the back pressure turbine through the steam supply pipe;
still be connected with first drain pipe between high pressure feed water heater with the oxygen-eliminating device, the steam in the high pressure feed water heater steam chamber passes through after the condensation first drain pipe flows into the oxygen-eliminating device.
2. The system of claim 1, wherein the system comprises: the high-pressure heater comprises a first pumping high-pressure heater and a second pumping high-pressure heater, the water outlet temperature of the first pumping high-pressure heater is higher than that of the second pumping high-pressure heater, the steam extraction pipe comprises a steam extraction pipe and two steam extraction pipes, and the steam outlet pressure of the first steam extraction pipe is higher than that of the second steam extraction pipe; the second pumping high-pressure heater can convey deoxygenated salt-free water to the first pumping high-pressure heater;
the two high-pressure pumping heaters are connected with the two steam extraction pipes, the first water supply pipe and the first drain pipe, the one high-pressure pumping heater is connected with the one steam extraction pipe, the second water supply pipe and the third water supply pipe, the second drain pipe is further connected between the one high-pressure pumping heater and the two high-pressure pumping heaters, and steam in the steam chamber of the one high-pressure pumping heater is condensed and then flows into the steam chamber of the two high-pressure pumping heaters through the second drain pipe.
3. The system of claim 2, wherein the system comprises: a desuperheater is arranged between the two high-pressure pumping heaters and the first high-pressure pumping heater, a fourth water supply pipe is connected between the two high-pressure pumping heaters and the desuperheater, a fifth water supply pipe is connected between the desuperheater and the first high-pressure pumping heater, deoxygenated saltless water in the water chamber of the two high-pressure pumping heaters enters the water chamber of the desuperheater through the fourth water supply pipe, and deoxygenated saltless water in the water chamber of the desuperheater enters the water chamber of the first high-pressure pumping heater through the fifth water supply pipe;
a steam balance pipe is connected between the top of the water tank and the steam chamber of the desuperheater, the steam extraction pipe is also connected with the steam chamber of the desuperheater, steam in the steam extraction pipe is cooled to saturation temperature through the desuperheater, and saturated steam enters the top of the water tank through the steam balance pipe.
4. An energy storage regulated heat supply peak and valley system using high pressure heaters, according to claim 3, wherein: and a third drain pipe is connected between the desuperheater and the high-pressure pumping heater, the desuperheater is higher than the high-pressure pumping heater, and steam in a steam chamber of the desuperheater is condensed and then flows into the steam chamber of the high-pressure pumping heater through the third drain pipe.
5. The system of claim 1, wherein the system comprises: the control component comprises a variable-speed pressurizing water pump and an adjusting valve, the variable-speed pressurizing water pump is used for controlling the pressure of the deoxygenated saltless water, and the adjusting valve is used for controlling the flow of the deoxygenated saltless water;
a bidirectional flowmeter is arranged on the second water supply pipe and is used for monitoring the amount of deoxygenated and saltless water entering and exiting the water tank;
and a boiler water feeding pump is arranged on the third water supply pipe and used for conveying deoxygenated salt-free water to the boiler in a pressurized mode.
6. The utility model provides an utilize high pressure feed water heater's energy storage to adjust heat supply peak valley system's operation mode which characterized in that: including a valley time mode of operation S1 and a peak time mode of operation S2;
in the valley-time heating period, the valley-time operation mode S1 includes the steps of:
s11: the deaerator is used for preparing deaerated salt-free water, and the amount of the prepared deaerated salt-free water is larger than that of water required by a boiler;
s12: heating the deoxygenated water by a high-pressure heater to reach a rated water temperature;
s13: extracting the required high-temperature deoxygenation salt-free water by the boiler, and feeding the residual high-temperature deoxygenation salt-free water into a water tank for storage;
in the peak heating period, the peak time operation mode S2 includes the following steps:
s21: the deaerator reduces the preparation of deaerated non-salt water, and the heating water amount of the high-pressure heater is reduced; the steam consumption of the system is further reduced, and the saved steam enters a heat supply main pipe for heat supply;
s22: the boiler can extract high-temperature deoxygenation salt-free water stored in the water tank while extracting high-temperature deoxygenation salt-free water prepared by the high-pressure heater so as to meet the water quantity required by the boiler.
7. The operation mode of the system for regulating the peak-valley heating by the stored energy of the high-pressure heater as claimed in claim 6, wherein: the high-pressure heater of the system comprises a first pumping high-pressure heater and a second pumping high-pressure heater, wherein the first pumping high-pressure heater has an ultrahigh-pressure heating function, the second pumping high-pressure heater has a high-pressure heating function, the first pumping high-pressure heater is connected with a backpressure steam turbine through a steam extraction pipe, and the second pumping high-pressure heater is connected with the backpressure steam turbine through a second steam extraction pipe; in the step S12, the deoxygenated water is sequentially heated by the two-pumping high-pressure heater and the one-pumping high-pressure heater to reach the rated temperature.
8. The operation mode of the peak-valley heating system using energy storage regulation of the high-pressure heater as set forth in claim 7, wherein: a desuperheater is arranged between the first pumping high-pressure heater and the second pumping high-pressure heater, and deoxygenated salt-free water in the second pumping high-pressure heater enters the first pumping high-pressure heater after passing through the desuperheater; the steam balance pipe is connected between the water tank and the desuperheater, the steam balance pipe is connected with a steam extraction pipe through the desuperheater, steam in the steam extraction pipe is cooled to a saturation temperature through the desuperheater, and the saturated steam enters the top of the water tank through the steam balance pipe and is used for reducing the service temperature of the water tank.
9. The operation mode of the system for regulating the peak-valley heating by the stored energy of the high-pressure heater as claimed in claim 8, wherein: in step S11, the supply of the deoxygenated and desalted water is increased by the variable-speed pressurizing water pump, the water pressure is adjusted to be higher than the steam pressure of a steam extraction pipe, and the water supply amount is adjusted to be higher than the water amount required by the boiler by adjusting the opening of the regulating valve.
10. The operation mode of the peak-valley heating system using energy storage regulation of the high-pressure heater according to claim 9, wherein: the above operation mode further includes a condensed water-repellent step S3: a third drain pipe is connected between the desuperheater and the first high-pressure pumping heater, a second drain pipe is also connected between the first high-pressure pumping heater and the second high-pressure pumping heater, and a first drain pipe is also connected between the high-pressure heater and the deaerator; the condensed water in the desuperheater flows into the first pumping high-pressure heater due to the height difference, the condensed water in the first pumping high-pressure heater flows into the second pumping high-pressure heater due to the pressure difference, and the condensed water in the second pumping high-pressure heater flows into the deaerator due to the pressure difference and is recycled.
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| CN104763485A (en) * | 2014-04-30 | 2015-07-08 | 南京博沃科技发展有限公司 | Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit |
| CN105737134A (en) * | 2016-04-08 | 2016-07-06 | 中国联合工程公司 | Boiler deoxidization water supply system and method capable of balancing heating load of power station |
| CN106089338A (en) * | 2016-06-03 | 2016-11-09 | 东南大学 | A kind of back pressure machine association system regulating heat supply and generating and method |
| CN212511076U (en) * | 2020-07-21 | 2021-02-09 | 宁波正源电力有限公司 | Utilize high pressure feed water heater's energy storage to adjust heat supply peak valley system |
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2020
- 2020-07-21 CN CN202010705075.5A patent/CN111706846A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763485A (en) * | 2014-04-30 | 2015-07-08 | 南京博沃科技发展有限公司 | Thermodynamic system of concurrent heating ultra-high pressure/subcritical backpressure heat supply unit |
| CN105737134A (en) * | 2016-04-08 | 2016-07-06 | 中国联合工程公司 | Boiler deoxidization water supply system and method capable of balancing heating load of power station |
| CN106089338A (en) * | 2016-06-03 | 2016-11-09 | 东南大学 | A kind of back pressure machine association system regulating heat supply and generating and method |
| CN212511076U (en) * | 2020-07-21 | 2021-02-09 | 宁波正源电力有限公司 | Utilize high pressure feed water heater's energy storage to adjust heat supply peak valley system |
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