CN110671690A - Electrode boiler and heat storage water tank combined peak regulation method and special device - Google Patents
Electrode boiler and heat storage water tank combined peak regulation method and special device Download PDFInfo
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- CN110671690A CN110671690A CN201911055719.4A CN201911055719A CN110671690A CN 110671690 A CN110671690 A CN 110671690A CN 201911055719 A CN201911055719 A CN 201911055719A CN 110671690 A CN110671690 A CN 110671690A
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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
- F22D1/003—Feed-water heater systems
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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
Abstract
The invention relates to the technical field of electric power peak regulation, in particular to a combined peak regulation method and a special device for an electrode boiler and a heat storage water tank. When the peak regulation requirement of the power grid exists, the electrode boiler heats the condensed water through the second plate heat exchanger, the condensed water after temperature rise does not enter the No. 7 low-pressure heater and does not exchange heat with the steam discharged by the low-pressure cylinder of the steam turbine any more, but enters the No. 6 water side channel of the low-pressure heater, and meanwhile, the steam extraction valve of the No. 6 steam side channel of the low-pressure heater is closed and does not extract steam any more, so that the electrode boiler only plays a role of conveying the condensed water through a pipeline, and the steam of the No. 6 low-pressure heater is saved in the; it is after the peak regulation demand, and the retaining water pitcher is exothermic in order to promote the condensate temperature.
Description
Technical Field
The invention relates to the technical field of electric power peak regulation, in particular to a combined peak regulation method of an electrode boiler and a heat storage water tank and a special device.
Background
In recent years, the capacity of a thermal power generator assembling machine in an electric power market in Xinjiang area in China is excessive, especially in the heating period in winter, in order to ensure the livelihood and guarantee the smooth centralized heat supply in urban areas, a cogeneration thermal power generator unit has to carry electric load and thermal load according to the minimum operation condition approved by a power grid, under the premise of ensuring the heat supply of the unit, the cogeneration unit cannot reduce the electric load, the load adjustment space of the power grid is limited, and the phenomena of wind and light abandon of new energy such as photovoltaic energy, wind power and the like are caused.
Disclosure of Invention
The invention provides a combined peak regulation method and a special device for an electrode boiler and a heat storage water tank, which overcome the defects of the prior art, introduce the electrode boiler to participate in deep peak regulation, store and recycle the generated excess heat energy in a water-water heat exchange mode, improve the water supply temperature of a thermal power unit, reduce the steam extraction quantity, improve the working capacity of the thermal power unit, can effectively participate in the deep peak regulation of a power grid, and can save the use amount of raw coal.
One of the technical schemes of the invention is realized by the following measures: a peak regulation method combining an electrode boiler and a heat storage water tank is carried out according to the following method: when peak regulation is needed, the electrode boiler is started, primary water in the electrode boiler is used as primary side water of the first plate type heat exchanger to exchange heat with secondary side water of the first plate type heat exchanger, meanwhile, steam of the steam turbine continuously works in a low-pressure steam turbine cylinder, after the steam of the steam turbine finishes working in the low-pressure steam turbine cylinder, the steam is cooled through heat exchange of the No. 7 low-pressure heater and then enters the condenser to be condensed into condensed water, the condensed water is used as secondary side water of the second plate type heat exchanger, part of secondary side hot water of the first plate type heat exchanger is used as primary side water of the second plate type heat exchanger to exchange heat with the condensed water, the condensed water after heat exchange and temperature rise enters a water side channel of the No. 6 low-pressure heater, at the moment, a steam extraction valve on the steam side channel of the No. 6 low-pressure heater is closed, steam extraction is not;
and the other part of the secondary side hot water of the first plate heat exchanger is used as the primary side water of the third plate heat exchanger to exchange heat for part of the primary side backwater of the second plate heat exchanger, the primary side backwater after heat exchange of the third plate heat exchanger and the secondary side inlet water of the first plate heat exchanger are mixed into hot water with rated temperature, and after peak regulation is finished, the temperature of the unit condensate water is improved by using the part of the hot water.
The following is a further optimization or/and improvement of one of the above-mentioned technical solutions of the invention:
the primary side backwater of the second plate type heat exchanger is divided into two strands, the first strand is used as the secondary side water of the first plate type heat exchanger to return to the secondary side of the first plate type heat exchanger for heat exchange, one part of the second strand exchanges heat with the secondary side hot water of the first plate type heat exchanger through the third plate type heat exchanger, the other part of the primary side backwater second strand, one part of the primary side backwater second strand after heat exchange and the secondary side inlet water of the first plate type heat exchanger are mixed into hot water with rated temperature, and after peak regulation is finished, the temperature of the condensate water of the unit is improved by utilizing the hot water.
The hot water mixed into rated temperature is stored through the heat storage water tank, and after peak regulation is finished, the heat storage water tank releases hot water, and the hot water and condensed water exchange heat to improve the temperature of the condensed water of the unit.
The second technical scheme of the invention is realized by the following measures: a special device for implementing the peak shaving method combining the electrode boiler and the heat storage water tank in the technical proposal comprises the electrode boiler, a first plate type heat exchanger, a second plate type heat exchanger, a steam turbine low-pressure cylinder and a No. 5 low-pressure heater, the steam outlet of the steam turbine low-pressure cylinder is communicated with the steam side channel inlet of the No. 7 low-pressure heater, the steam side channel outlet of the No. 7 low-pressure heater is communicated with the inlet of the condenser, the outlet of the condenser is communicated with the water side channel inlet of the No. 7 low-pressure heater through a first pipeline, the water side channel outlet of the No. 7 low-pressure heater is communicated with the water side channel inlet of the No. 6 low-pressure heater, and the water side channel outlet of the No. 6 low-pressure heater is communicated with the water side channel inlet of the No. 5 low-pressure heater; a water outlet at the lower part of the electrode boiler is communicated with a primary side channel inlet of a first plate type heat exchanger, a water return port at the upper part of the electrode boiler is communicated with a primary side channel outlet of the first plate type heat exchanger, a secondary side channel outlet of the first plate type heat exchanger is communicated with a primary side channel inlet of a second plate type heat exchanger through a first water inlet pipeline, a primary side channel outlet of the second plate type heat exchanger is communicated with a secondary side channel inlet of the first plate type heat exchanger through a first water return pipeline, a second water return pipeline is communicated between the secondary side channel outlet of the second plate type heat exchanger and the first pipeline, a second water inlet pipeline is communicated between the secondary side channel inlet of the second plate type heat exchanger and the first pipeline, a valve is connected in series with the first pipeline between the second water inlet pipeline and the second water return pipeline, a first pipeline is communicated between the second water return pipeline and the water side channel inlet of the No. 7 low-pressure heater and the, valves are connected in series on the first branch pipeline, the second water inlet pipeline and the second water return pipeline, and a valve is connected in series on the first pipeline between the first branch pipeline and the inlet of the water side channel of the No. 7 low-pressure heater; a primary side channel inlet of the third plate heat exchanger is communicated with a first water inlet pipeline through a third water inlet pipeline, a primary side channel outlet of the third plate heat exchanger is communicated with a first water return pipeline through a third water return pipeline, a secondary side channel outlet of the third plate heat exchanger is communicated with a first inlet and a first outlet of a cold-hot water mixer through a fourth water inlet pipeline, a secondary side channel inlet of the third plate heat exchanger is communicated with the first water return pipeline through a first hot water pipeline, the first water inlet pipeline is communicated with a second inlet and a second outlet of the cold-hot water mixer through a second hot water pipeline, and valves are connected in series on the fourth water inlet pipeline, the first hot water pipeline and the second hot water pipeline; a communicating pipe is communicated between the third inlet and the third outlet of the cold-hot water mixer and the first hot water pipeline, and a valve is connected in series on the communicating pipe.
The following is further optimization or/and improvement of the second technical scheme of the invention:
the cold-hot water mixer further comprises a heat storage water tank, the communicating pipe is communicated with a water inlet at the lower part of the heat storage water tank through a heat storage pipeline, a circulating pump is connected in series on the heat storage pipeline, a first valve is connected in series on the heat storage pipeline between the circulating pump and the water inlet at the lower part of the heat storage water tank, a heat release pipeline is connected in series between a water outlet of the circulating pump and a heat storage pipeline of the first valve and a water outlet at the upper part of the heat storage water tank, a valve is connected in series on the heat release pipeline, a valve is connected in series on the communicating pipe between a third inlet and a third outlet of the cold-hot water mixer and the heat storage pipeline, a valve is connected in series on the heat storage pipeline between the communicating.
And the second water inlet pipeline and the first pipeline of the outlet of the condenser are connected in series with a condensate pump.
When the peak shaving requirement of a power grid exists, the electrode boiler 1 heats condensed water through the second plate heat exchanger, the condensed water after being heated does not enter the No. 7 low-pressure heater and does not exchange heat with the steam exhausted by the low-pressure cylinder of the steam turbine any more, but enters the No. 6 water side channel of the low-pressure heater, meanwhile, the steam extraction valve of the No. 6 steam side channel of the low-pressure heater is closed and does not extract steam, namely, the No. 6 water side channel of the low-pressure heater is not heated, the No. 6 water side channel of the low-pressure heater is not a heat exchange channel and only plays a role of conveying the condensed water through a pipeline, then the condensed water after being heated enters the No. 5 water side channel of the low-pressure heater according to a normal flow to enter the deaerator to be deaerated and heated; it is after the peak regulation demand, and the retaining water pitcher is exothermic in order to promote the condensate temperature.
Drawings
FIG. 1 is a process flow diagram of the present invention.
The codes in the figures are respectively: the boiler comprises an electrode boiler 1, a first plate heat exchanger 2, a second plate heat exchanger 3, a steam turbine low-pressure cylinder 4, a low-pressure heater 5, a low-pressure heater 6, a low-pressure heater 7, a condenser 8, a first pipeline 9, a first water inlet pipeline 10, a first water return pipeline 11, a second water return pipeline 12, a second water inlet pipeline 13, a valve 14, a first branch pipeline 15, a deaerator 16, a third plate heat exchanger 17, a cold-hot water mixer 18, a third water inlet pipeline 19, a third water return pipeline 20, a fourth water inlet pipeline 21, a first hot water pipeline 22, a second hot water pipeline 23, a heat storage water tank 24, a heat storage pipeline 25, a heat storage pipeline 26, a circulating pump 27, a first valve 28, a heat release pipeline 29, a condensate pump 29 and a communicating pipe 30.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 1 of the specification.
The invention is further described with reference to the following examples and figures:
example 1: as shown in the attached figure 1, the peak shaving method of the electrode boiler and the heat storage water tank is carried out according to the following method: when peak regulation is needed, the electrode boiler 1 is started, primary water in the electrode boiler 1 is used as primary side water of the first plate heat exchanger 2 to exchange heat with secondary side water of the first plate heat exchanger 2, meanwhile, the steam of the steam turbine continuously does work in the low pressure cylinder 4 of the steam turbine, after the steam of the steam turbine does work in the low pressure cylinder 4 of the steam turbine, the condensed water is cooled by heat exchange of a No. 7 low-pressure heater 7 and then enters a condenser 8 to be condensed into condensed water, the condensed water is used as secondary side water of the second plate heat exchanger 3, part of secondary side hot water of the first plate heat exchanger 2 is used as primary side water of the second plate heat exchanger 3 to exchange heat with the condensed water, the condensed water after heat exchange and temperature rise enters a water side channel of a No. 6 low-pressure heater 6, at the moment, an extraction valve on a steam pipeline communicated with a steam side channel of the No. 6 low-pressure heater 6 is closed, steam is not extracted any more, and then condensed water enters the No. 5 low-pressure heater 5 and the deaerator 16;
and the other part of the secondary side hot water of the first plate heat exchanger 2 is used as the primary side water of the third plate heat exchanger 17 to exchange heat for part of the primary side backwater of the second plate heat exchanger 3, the primary side backwater after heat exchange of the third plate heat exchanger 17 and the secondary side inlet water of the first plate heat exchanger 2 are mixed into hot water with rated temperature, and after peak regulation is finished, the temperature of the unit condensate water is improved by using the part of the hot water.
Example 2: as shown in fig. 1, as an optimization of the above embodiment, the primary-side backwater of the second plate heat exchanger 3 is divided into two streams, the first stream is returned to the secondary side of the first plate heat exchanger 2 as the secondary-side water of the first plate heat exchanger 2 for heat exchange, one part of the second stream exchanges heat with the secondary-side hot water of the first plate heat exchanger 2 through the third plate heat exchanger 17, the other part of the primary-side backwater second stream, one part of the primary-side backwater second stream after heat exchange and the secondary-side inlet water of the first plate heat exchanger 2 are mixed into hot water with a rated temperature, and after peak regulation is finished, the temperature of the condensate water of the unit is increased by using.
Example 3: as shown in fig. 1, as an optimization of the above embodiment, the hot water mixed to a rated temperature is stored in the hot water storage tank 24, and after the peak shaving is finished, the hot water storage tank 24 releases hot water, and the hot water exchanges heat with the condensed water to increase the temperature of the condensed water in the unit.
Example 4: as shown in the attached figure 1, the special device for implementing the peak shaving method by combining the electrode boiler and the heat storage water tank comprises an electrode boiler 1, a first plate type heat exchanger 2, a second plate type heat exchanger 3, a steam turbine low-pressure cylinder 4, a No. 5 low-pressure heater 5, the steam outlet of the steam turbine low pressure cylinder 4 is communicated with the steam side channel inlet of the No. 7 low pressure heater 7, the steam side channel outlet of the No. 7 low pressure heater 7 is communicated with the inlet of the condenser 8, the outlet of the condenser 8 is communicated with the water side channel inlet of the No. 7 low pressure heater 7 through a first pipeline 9, the water side channel outlet of the No. 7 low pressure heater 7 is communicated with the water side channel inlet of the No. 6 low pressure heater 6, and the water side channel outlet of the No. 6 low pressure heater 6 is communicated with the water side channel inlet of the No. 5 low pressure heater 5; a water outlet at the lower part of the electrode boiler 1 is communicated with a primary side channel inlet of a first plate type heat exchanger 2, a water return port at the upper part of the electrode boiler 1 is communicated with a primary side channel outlet of the first plate type heat exchanger 2, a secondary side channel outlet of the first plate type heat exchanger 2 is communicated with a primary side channel inlet of a second plate type heat exchanger 3 through a first water inlet pipeline 10, a primary side channel outlet of the second plate type heat exchanger 3 is communicated with a secondary side channel inlet of the first plate type heat exchanger 2 through a first water return pipeline 11, a second water return pipeline 12 is communicated between the secondary side channel outlet of the second plate type heat exchanger 3 and a first pipeline 9, a second water inlet pipeline 13 is communicated between the secondary side channel inlet of the second plate type heat exchanger 3 and the first pipeline 9, a water return valve 14 is connected in series with the first pipeline 9 between the second water inlet pipeline 13 and the second water return pipeline 12, and a first pipeline 9 between the water side channel inlet of a second low pressure heater 7 and a A first branch pipeline 15 is communicated among inlets of the water side channels, valves 14 are connected in series on the first branch pipeline 15, a second water inlet pipeline 13 and a second water return pipeline 12, and a valve 14 is connected in series on a first pipeline 9 between the first branch pipeline 15 and an inlet of the water side channel of the No. 7 low-pressure heater 7;
a primary side channel inlet of the third plate heat exchanger 17 is communicated with the first water inlet pipeline 10 through a third water inlet pipeline 19, a primary side channel outlet of the third plate heat exchanger 17 is communicated with the first water return pipeline 11 through a third water return pipeline 20, a secondary side channel outlet of the third plate heat exchanger 17 is communicated with a first inlet and outlet of the cold-hot water mixer 18 through a fourth water inlet pipeline 21, a secondary side channel inlet of the third plate heat exchanger 17 is communicated with the first water return pipeline 11 through a first hot water pipeline 22, the first water inlet pipeline 10 is communicated with a second inlet and outlet of the cold-hot water mixer 18 through a second hot water pipeline 23, and valves 14 are connected in series on the fourth water inlet pipeline 21, the first hot water pipeline 22 and the second hot water pipeline 23; a communicating pipe 30 is communicated between the third inlet and outlet of the cold-hot water mixer 18 and the first hot water pipeline 22, and the valve 14 is connected in series on the communicating pipe 30.
The working process of the existing thermal generator set condensed water is as follows: after the steam of the steam turbine does work in the steam turbine low pressure cylinder 4, the steam is cooled through the heat exchange of the No. 7 low pressure heater 7, and then enters the condenser 8 to be condensed into condensed water, the condensed water is circulated to the water side channel of the No. 7 low pressure heater 7 through the condensed water pump 29 to be heated, and then enters the No. 6 low pressure heater 6 to be secondarily heated (water-steam heat exchange), and then enters the No. 5 low pressure heater 5 to be heat exchanged (water-steam heat exchange), the water heated to the rated temperature enters the deaerator 16 to be deaerated and heated, and finally enters the heating system of the other stage.
The invention is improved aiming at a process flow from a condensate pump 29 to a deaerator 16 of condensed water of a thermal generator set, when a peak regulation demand exists in a power grid (for example, in a power consumption valley period of the power grid), an electrode boiler 1 heats the condensed water through a second plate heat exchanger 3, the heated condensed water does not enter a No. 7 low-pressure heater 7 and does not exchange heat with the exhausted steam of a steam turbine low-pressure cylinder 4, because the temperature of the condensed water reaches more than 100 ℃, the condensed water enters a No. 6 water side channel of the No. 6 low-pressure heater through a first branch pipeline 15, a steam extraction valve of a No. 6 steam side channel of the No. 6 low-pressure heater is closed, steam is not extracted, namely the No. 6 water side channel of the No. 6 low-pressure heater is not a heat exchange channel, but only plays a role of conveying the condensed water through a pipeline, and the heated condensed water enters a No. 5 water side channel of the No. 5 low-pressure heater according to a normal flow to, the whole process saves the steam of the No. 6 low-pressure heater 6.
By the operation, the electrode boiler 1 is introduced to participate in deep peak regulation, so that the water supply temperature of a thermal power generating unit (which is subsequently referred to as a unit for short) can be increased, the steam extraction amount is reduced, more steam can be used for the unit to do work, the work capacity of the unit is improved, the purpose of deep peak regulation of a power grid is effectively achieved, the raw coal usage of the unit is saved, and the purposes of energy conservation and environmental protection are achieved.
Specifically, in the peak regulation process, when the power grid has a peak regulation demand, the electrode boiler 1 is started, primary water in the electrode boiler 1 exchanges heat with secondary water outside the electrode boiler through the first plate heat exchanger 2, so that the outlet water temperature of the first plate heat exchanger 2 reaches a rated temperature, a part of heat energy of the electrode boiler 1 enters a unit through the second plate heat exchanger 3 for real-time absorption, and the other part of heat energy which cannot be absorbed enters the cold-hot water mixer 18 to be mixed with the outlet water of the second plate heat exchanger 3 after exchanging heat with the return water of the second plate heat exchanger 3 through the third plate heat exchanger 17, so as to be mixed into hot water at the rated temperature and stored; after the peak regulation is finished, the temperature of the condensed water of the unit can be increased by utilizing the hot water, and the hot water is sent to a primary side channel of the second plate heat exchanger 3 through the cold-hot water mixer 18 and the second hot water pipeline 23 in sequence to exchange heat with the condensed water of the unit, so that the feed water temperature of the unit is increased, and the excess heat energy of the electrode boiler 1 is fully recycled.
The primary side backwater of the second plate heat exchanger 3 can directly enter the cold-hot water mixer 18 through the communicating pipe 30 to be mixed with the rest water flow.
The invention can not only make the machine set carry out deep peak regulation, effectively relieve the phenomena of wind abandoning and light abandoning caused by surplus electric power in northwest areas, and provide auxiliary service for surfing the internet by clean energy; the technical problem that the conventional thermoelectric unit or straight condensing unit cannot carry out deep peak regulation in the non-heating period is effectively solved; in addition, the invention definitely designs a solution of deep peak regulation, details the technological process of the solution, and is clearer and clearer than the existing scheme of peak regulation through the electrode boiler 1, and has operability.
The special device can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the hot water storage tank 24 further comprises a hot water storage tank 24, a communication pipe 30 is communicated with a lower water inlet of the hot water storage tank 24 through a hot water storage pipeline 25, a circulating pump 26 is connected in series with the hot water storage pipeline 25 between the circulating pump 26 and the lower water inlet of the hot water storage tank 24, a first valve 27 is connected in series with the hot water storage pipeline 25, a heat release pipeline 28 is communicated between a water outlet of the circulating pump 26 and a water outlet of the hot water storage tank 24 and between the hot water storage pipeline 25 of the first valve 27 and an upper water outlet of the hot water storage tank 24, a valve 14 is connected in series with the heat release pipeline 28, a valve 14 is connected in series with the communication pipe 30 between a third water inlet of the cold-hot water mixer 18 and the hot water storage pipeline 25, a valve 14 is connected in series with the hot water storage pipeline 25 between the.
The secondary water of the third plate heat exchanger 17 and the primary backwater of the second plate heat exchanger 3 are mixed in the cold-hot water mixer 18 to form hot water with the rated temperature not higher than 95 ℃ (the inner coating of the heat storage water tank 24 can be damaged due to overhigh temperature), and then the hot water is pumped to the heat storage water tank 24 through the circulating pump 26 to store heat.
After the peak regulation is finished, the heat storage water tank 24 releases heat, hot water in the heat storage water tank 24 is pumped into a primary side channel of the second plate heat exchanger 3 through the second hot water pipeline 23, heat exchange with unit condensed water is continued, and heat release operation of the heat storage water tank 24 is stopped until the hot water in the heat storage water tank 24 exchanges heat to the same temperature as the unit condensed water.
According to the invention, the electrode boiler 1 is introduced to participate in deep peak shaving, and the generated excess heat energy is recycled (heat is stored by using the heat storage water tank 24) in a water-water heat exchange mode, so that the water supply temperature of the unit is increased, the steam extraction amount is reduced, the working capacity of the unit is improved, the deep peak shaving of a power grid can be effectively participated in, the use amount of raw coal can be saved, and the purposes of energy conservation and environmental protection are achieved.
As shown in fig. 1, a condensate pump 29 is connected in series between the second water inlet line 13 and the first line 9 at the outlet of the condenser 8.
In conclusion, the invention improves the deep peak regulation capability of the thermal generator set based on the combination of the electrode boiler 1 and the heat storage water tank 24, and simultaneously utilizes the heat energy stored in the electrode boiler 1 and the heat storage water tank 24 to heat the condensed water, improve the temperature of the condensed water and reduce the steam extraction of the generator set through a water-water heat exchange method, thereby saving the usage amount of the fire coal.
The above technical features constitute a preferred embodiment of the present invention, which has strong adaptability and better implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
The use process of the invention is as follows:
when peak regulation is needed, the electrode boiler 1 is started, a valve 14 of a second water inlet pipeline 13 and a second water return pipeline 12 is closed, steam of a steam turbine does work in a steam turbine low-pressure cylinder 4, the steam is cooled through heat exchange of a No. 7 low-pressure heater 7 and then enters a condenser 8 to be condensed into condensed water, primary water in the electrode boiler 1 and secondary water outside the primary water exchange heat through a first plate heat exchanger 2, hot water in the first plate heat exchanger 2 exchanges heat with a second plate heat exchanger 3, a part of heat energy of the electrode boiler 1 exchanges heat with the condensed water through the second plate heat exchanger 3, namely the condensed water from the condenser 8 enters a secondary side channel of the second plate heat exchanger 3 through a second water inlet pipeline 13 to exchange heat with the heat energy of the electrode boiler 1, the condensed water after heat exchange enters a water side channel of the No. 6 through the second water return pipeline 12 and a first branch pipeline 15 in sequence, at the moment, an extraction valve on a steam pipeline communicated with a steam side channel of the No. 6 low-pressure heater 6 is closed, steam is not extracted any more, and then condensed water enters the No. 5 low-pressure heater 5 and the deaerator 16 according to a normal flow;
after the other part of the heat energy of the electrode boiler 1 is subjected to heat exchange with the primary side backwater of the second plate heat exchanger 3 through the third plate heat exchanger 17, the heat energy enters the cold-hot water mixer 18 to be mixed with the primary side effluent of the second plate heat exchanger 3, and after the mixture is mixed into hot water with rated temperature, the hot water is pumped into the heat storage water tank 24 from the lower part of the heat storage water tank 24 through the heat storage pipeline 25 through the circulating pump 26 to be subjected to heat storage;
after the peak regulation is finished, the temperature of the condensed water of the unit can be improved by utilizing the hot water, and the hot water in the heat storage water tank 24 is sent to a primary side channel of the second plate heat exchanger 3 through the cold-hot water mixer 18 and the second hot water pipeline 23 in sequence to exchange heat with the condensed water of the unit, so that the feed water temperature of the unit is improved, and the excess heat energy of the electrode boiler 1 is fully recycled;
when the heat storage water tank 24 releases heat, hot water in the heat storage water tank 24 is pumped into the primary side channel of the second plate heat exchanger 3 through the heat release pipeline 28 and the second hot water pipeline 23 in sequence to exchange heat with the condensed water, and the heat release operation of the heat storage water tank 24 is stopped until the hot water in the heat storage water tank 24 exchanges heat to the same temperature as the condensed water.
Claims (7)
1. A peak shaving method combining an electrode boiler and a heat storage water tank is characterized by comprising the following steps: when peak regulation is needed, the electrode boiler is started, primary water in the electrode boiler is used as primary side water of the first plate type heat exchanger to exchange heat with secondary side water of the first plate type heat exchanger, meanwhile, steam of the steam turbine continuously works in a low-pressure steam turbine cylinder, after the steam of the steam turbine finishes working in the low-pressure steam turbine cylinder, the steam is cooled through heat exchange of the No. 7 low-pressure heater and then enters the condenser to be condensed into condensed water, the condensed water is used as secondary side water of the second plate type heat exchanger, part of secondary side hot water of the first plate type heat exchanger is used as primary side water of the second plate type heat exchanger to exchange heat with the condensed water, the condensed water after heat exchange and temperature rise enters a water side channel of the No. 6 low-pressure heater, at the moment, a steam extraction valve on the steam side channel of the No. 6 low-pressure heater is closed, steam extraction is not;
and the other part of the secondary side hot water of the first plate heat exchanger is used as the primary side water of the third plate heat exchanger to exchange heat for part of the primary side backwater of the second plate heat exchanger, the primary side backwater after heat exchange of the third plate heat exchanger and the secondary side inlet water of the first plate heat exchanger are mixed into hot water with rated temperature, and after peak regulation is finished, the temperature of the unit condensate water is improved by using the part of the hot water.
2. The peak shaving method combining the electrode boiler and the hot water storage tank as claimed in claim 1, wherein the primary side backwater of the second plate heat exchanger is divided into two streams, the first stream is used as the secondary side water of the first plate heat exchanger to return to the secondary side of the first plate heat exchanger for heat exchange, one part of the second stream exchanges heat with the secondary side hot water of the first plate heat exchanger through the third plate heat exchanger, the other part of the primary side backwater, one part of the heat exchanged primary side backwater second stream and the secondary side inlet water of the first plate heat exchanger are mixed into hot water with rated temperature, and after the peak shaving is finished, the temperature of the condensate water of the unit is increased by using the hot water.
3. The peak shaving method of the electrode boiler and the heat storage water tank in combination according to claim 1 or 2, characterized in that the hot water mixed to the rated temperature is stored through the heat storage water tank, and when the peak shaving is finished, the heat storage water tank releases hot water, and the temperature of the condensed water of the unit is increased by using the hot water to exchange heat with the condensed water.
4. A special device for implementing the peak shaving method of the electrode boiler and the hot water storage tank in combination according to claim 1, 2 or 3, the device is characterized by comprising an electrode boiler, a first plate heat exchanger, a second plate heat exchanger, a steam turbine low-pressure cylinder, a No. 5 low-pressure heater, a No. 6 low-pressure heater, a No. 7 low-pressure heater, a third plate heat exchanger, a cold-hot water mixer and a condenser, wherein a steam outlet of the steam turbine low-pressure cylinder is communicated with a steam side channel inlet of the No. 7 low-pressure heater, a steam side channel outlet of the No. 7 low-pressure heater is communicated with an inlet of the condenser, an outlet of the condenser is communicated with a water side channel inlet of the No. 7 low-pressure heater through a first pipeline, a water side channel outlet of the No. 7 low-pressure heater is communicated with a water side channel inlet of the No. 6 low-pressure heater, and a water side channel outlet of the No. 6 low; a water outlet at the lower part of the electrode boiler is communicated with a primary side channel inlet of a first plate type heat exchanger, a water return port at the upper part of the electrode boiler is communicated with a primary side channel outlet of the first plate type heat exchanger, a secondary side channel outlet of the first plate type heat exchanger is communicated with a primary side channel inlet of a second plate type heat exchanger through a first water inlet pipeline, a primary side channel outlet of the second plate type heat exchanger is communicated with a secondary side channel inlet of the first plate type heat exchanger through a first water return pipeline, a second water return pipeline is communicated between the secondary side channel outlet of the second plate type heat exchanger and the first pipeline, a second water inlet pipeline is communicated between the secondary side channel inlet of the second plate type heat exchanger and the first pipeline, a valve is connected in series with the first pipeline between the second water inlet pipeline and the second water return pipeline, a first pipeline is communicated between the second water return pipeline and the water side channel inlet of the No. 7 low-pressure heater and the, valves are connected in series on the first branch pipeline, the second water inlet pipeline and the second water return pipeline, and a valve is connected in series on the first pipeline between the first branch pipeline and the inlet of the water side channel of the No. 7 low-pressure heater; a primary side channel inlet of the third plate heat exchanger is communicated with a first water inlet pipeline through a third water inlet pipeline, a primary side channel outlet of the third plate heat exchanger is communicated with a first water return pipeline through a third water return pipeline, a secondary side channel outlet of the third plate heat exchanger is communicated with a first inlet and a first outlet of a cold-hot water mixer through a fourth water inlet pipeline, a secondary side channel inlet of the third plate heat exchanger is communicated with the first water return pipeline through a first hot water pipeline, the first water inlet pipeline is communicated with a second inlet and a second outlet of the cold-hot water mixer through a second hot water pipeline, and valves are connected in series on the fourth water inlet pipeline, the first hot water pipeline and the second hot water pipeline; a communicating pipe is communicated between the third inlet and the third outlet of the cold-hot water mixer and the first hot water pipeline, and a valve is connected in series on the communicating pipe.
5. The special apparatus as claimed in claim 4, further comprising a thermal storage tank, wherein the communication pipe is connected to the lower water inlet of the thermal storage tank through a thermal storage line, the thermal storage line is connected to the circulating pump in series, a first valve is connected to the thermal storage line between the circulating pump and the lower water inlet of the thermal storage tank in series, a heat release line is connected to the communication between the outlet of the circulating pump and the thermal storage line of the first valve and the upper water outlet of the thermal storage tank in series, a valve is connected to the heat release line in series, a valve is connected to the communication pipe between the third inlet and the thermal storage line of the cold-hot water mixer in series, a valve is connected to the thermal storage line between the communication pipe and the water inlet of the circulating pump in series, and a valve is connected to the communication pipe between the first.
6. The special device as claimed in claim 4, wherein the second water inlet pipeline and the first pipeline of the outlet of the condenser are connected in series with a condensate pump.
7. The special device of claim 5, wherein the second water inlet pipeline and the first pipeline of the outlet of the condenser are connected in series with a condensate pump.
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| CN209558305U (en) * | 2018-11-21 | 2019-10-29 | 赫普科技发展（北京）有限公司 | Vapour vapor extractor combination thermal storage electric boiler peak regulation system is penetrated by a kind of thermal power plant |
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