CN113028479A - Heating system and method of thermoelectric unit coupled distributed heat storage electric boiler - Google Patents
Heating system and method of thermoelectric unit coupled distributed heat storage electric boiler Download PDFInfo
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- CN113028479A CN113028479A CN202110477759.9A CN202110477759A CN113028479A CN 113028479 A CN113028479 A CN 113028479A CN 202110477759 A CN202110477759 A CN 202110477759A CN 113028479 A CN113028479 A CN 113028479A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/002—Central heating systems using heat accumulated in storage masses water heating system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/0002—Means for connecting central heating radiators to circulation pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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Abstract
The invention provides a heating system and a heating method of a thermoelectric unit coupling distributed heat storage electric boiler, which comprise a thermoelectric unit and a heat storage electric boiler, wherein a heat supply steam extraction outlet of the thermoelectric unit is connected with a steam side inlet of a steam-water heat exchanger of a heat supply first station, and a steam side outlet of the steam-water heat exchanger of the heat supply first station is connected with a condensed water treatment device of the thermoelectric unit; a main water supply pipeline is arranged at a water supply outlet of the steam-water heat exchanger of the heat supply initial station; a plurality of water outlets are arranged on the main water supply pipeline, and each water outlet is connected with a heat exchange station; a return water inlet of the steam-water heat exchanger of the heat supply initial station is connected with a return water main pipeline; the return water main pipeline is connected with a return water outlet of each heat exchange station; the heat exchange stations with unqualified heat supply quality in the plurality of heat exchange stations are also connected with a heat storage electric boiler; the invention can independently undertake the heat supply of peripheral heat users, thereby greatly improving the safety and reliability of heat supply; the integral heating system is safe and reliable; the peak-shaving heat source is clean and zero-emission, only low-price off-peak electricity is used for generating hot water, in addition, the heat supply quality of users with poor heat supply quality is favorably improved, the peak-shaving heat source can be used as a standby heat source, and when the load is switched due to the failure of a pipe network, the heat supply of peripheral heat users can be independently borne, so that the heat supply safety and reliability are greatly improved.
Description
Technical Field
The invention belongs to the field of centralized heat supply, and relates to a heat supply system and method of a thermoelectric unit coupled distributed heat storage electric boiler.
Background
In northern areas, normal life and work can be guaranteed only by heat supply in winter, and the heat supply mostly adopts a centralized heat supply mode, namely a cogeneration unit is taken as a basic heat source and a peak boiler is configured as a peak-load-adjusting heat source, the basic heat source bears all heat loads in the initial and final cold periods of heat supply, and the basic heat source runs at full load in the high cold period but still cannot meet the heat load requirement, so that the peak boiler needs to be started and transported.
Most of the existing spike boilers adopt coal-fired boilers, and the arrangement modes are two. One is centralized and arranged in a basic heat source place, namely a heat and power generator plant area, most of coal-fired boilers are far away from the city center, the space is sufficient, the operation and maintenance are convenient and fast, the environmental protection pressure is low, the defects are that the coal-fired boilers are far away from a load center, the effect of improving the heat supply quality of local users (old communities or end users) is not up to the standard, the coal-fired boilers are positioned at the initial point of a heat supply pipe network, the heat load cannot be switched when the pipe network fails, and the overall heat supply safety is poor; the other type is distributed in a load center, which is beneficial to improving the heat supply quality of old cells or end users, and can be used as a standby heat source, when the load is switched by a pipe network fault, the heat supply of peripheral heat users can be independently borne, the defect is that the heat supply center is positioned in the heat load center, is close to a city area (or positioned in the city area), the potential safety hazard of a local area is large, the environmental protection requirement is strict, the heat supply cost is high, and the load of a heat supply enterprise is heavy.
Disclosure of Invention
The invention aims to provide a heating system and a heating method of a thermoelectric unit coupled distributed heat storage electric boiler, which solve the defects of the conventional peak-shaving heat source.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a heating system of a thermoelectric unit coupled distributed heat storage electric boiler, which comprises a thermoelectric unit and a heat storage electric boiler, wherein a heat supply steam extraction outlet of the thermoelectric unit is connected with a main water supply pipeline; a plurality of water outlets are arranged on the main water supply pipeline, and each water outlet is connected with a heat exchange station;
a return water inlet of the thermoelectric unit is connected with a return water main pipeline; the return water main pipeline is connected with a return water outlet of each heat exchange station;
and the heat exchange stations with unqualified heat supply quality in the plurality of heat exchange stations are also connected with a heat storage electric boiler.
Preferably, a first-station circulating pump is arranged at a water return inlet of the heat supply first-station steam-water heat exchanger.
Preferably, the heat storage electric boiler comprises an electrode boiler, wherein a water outlet of the electrode boiler is connected with a high-temperature side water inlet of a plate heat exchanger; a high-temperature side water outlet of the plate heat exchanger is connected with a water inlet of the electrode boiler; a low-temperature side water outlet of the plate heat exchanger is connected with a water inlet of a heat exchange station with unqualified heat supply quality; and a low-temperature side water inlet of the plate heat exchanger is connected with a water outlet of the heat exchange station with unqualified heat supply quality.
Preferably, the heat storage electric boiler further comprises a heat storage water tank, wherein the electrode boiler is connected with the heat storage water tank, and a high-temperature water outlet of the heat storage water tank is connected with a water inlet of the heat exchange station, the heat supply quality of which does not reach the standard; and a water return port of the heat exchange station with unqualified heat supply quality is connected with a low-temperature water inlet of the heat storage water tank.
Preferably, a first-station circulating pump is arranged at a water return inlet of the heat supply first-station steam-water heat exchanger;
the heat storage electric boiler comprises an electrode boiler, wherein a water outlet of the electrode boiler is connected with a high-temperature side water inlet of a plate heat exchanger; a high-temperature side water outlet of the plate heat exchanger is connected with a water inlet of the electrode boiler; a low-temperature side water outlet of the plate heat exchanger is connected with a water inlet of a heat exchange station with unqualified heat supply quality; a low-temperature side water inlet of the plate heat exchanger is connected with a water outlet of the heat exchange station, the heat supply quality of which does not reach the standard;
the heat storage electric boiler also comprises a heat storage water tank, wherein the electrode boiler is connected with the heat storage water tank, and a high-temperature water outlet of the heat storage water tank is connected with a water inlet of the heat exchange station, the heat supply quality of which does not reach the standard; and a water return port of the heat exchange station with unqualified heat supply quality is connected with a low-temperature water inlet of the heat storage water tank.
A heating method of a thermoelectric unit coupling distributed heat storage electric boiler is based on a heating system of the thermoelectric unit coupling distributed heat storage electric boiler, and comprises the following steps:
according to the heating period, two operation modes are divided:
when the heat supply period is the initial and final cold periods, the heat storage electric boiler is stopped, the thermoelectric unit is put into operation, and heat is supplied to each heat exchange station through the thermoelectric unit;
when the heat supply period is a high and cold period or a pipe network fault, the heat storage electric boiler and the thermoelectric unit are both put into operation, heat is supplied to the heat exchange station with the heat supply quality not reaching the standard through the heat storage electric boiler, and the thermoelectric unit supplies heat to the rest heat exchange stations.
Preferably, when the electrode boiler is put into operation, the thermoelectric unit is put into operation, and the off-peak power is supplied, high-temperature water in the electrode boiler enters a high-temperature side inlet of the plate heat exchanger, a low-temperature outlet of the plate heat exchanger is divided into two paths, wherein one path enters the heat storage water tank for heat storage, and the other path supplies heat to the heat exchange station with the thermal mass which does not reach the standard; and supplying heat to the rest heat exchange stations through a thermoelectric power unit.
Preferably, when the electrode boiler is shut down, the thermoelectric generator set is put into operation and the peak power is leveled, the heat storage water tank enters a heat release mode to supply heat to the heat exchange station with the heat supply quality not up to the standard; and the thermoelectric generator set supplies heat to the rest heat exchange stations.
Compared with the prior art, the invention has the beneficial effects that:
according to the heat supply system and the heat supply method of the thermoelectric unit coupling distributed heat storage electric boiler, the thermoelectric unit is used as a basic heat source, the heat storage electric boiler is used as a peak regulation heat source, and the whole heat supply system is safe and reliable; the peak-shaving heat source is clean and zero-emission, only low-cost off-peak electricity is used for generating hot water, in addition, the peak-shaving heat source is arranged in a heat load center, the heat supply quality of old communities or end users is favorably improved, the peak-shaving heat source can be used as a standby heat source, when the load is switched due to faults of a pipe network, heat supply of peripheral heat users can be independently borne, and the safety and reliability of heat supply are greatly improved.
Furthermore, the heat storage water tank is used for storing energy, heat can be released in the peak flat period, heat required by a heat user is provided, valley electric power can be consumed, and the contradiction between peak regulation and heat supply of a power grid is relieved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
the system comprises a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a fifth valve 5, a sixth valve 6, a seventh valve 7, an eighth valve 8, a ninth valve 9, a tenth valve 10, a thermoelectric unit 11, a heat supply first station steam-water heat exchanger 12, an electrode boiler 13, a plate heat exchanger 14, a heat storage water tank 15, a first station circulating pump 16, a boiler circulating pump 17, a heat storage pump 18, a heat supply pump 19 and a heat exchange station 20 with unqualified heat supply quality.
Detailed Description
The invention provides a heating system of a thermoelectric unit coupled distributed heat storage electric boiler, which is further described in detail with reference to the accompanying drawings. The following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its application.
Referring to fig. 1, the heat supply system of the thermoelectric generating set coupled distributed heat storage electric boiler provided by the invention comprises a first valve 1, a second valve 2, a third valve 3, a fourth valve 4, a fifth valve 5, a sixth valve 6, a seventh valve 7, an eighth valve 8, a ninth valve 9, a tenth valve 10, a thermoelectric generating set 11, a heat supply first station steam-water heat exchanger 12, an electrode boiler 13, a plate heat exchanger 14, a heat storage water tank 15, a first station circulating pump 16, a boiler circulating pump 17, a heat storage pump 18, a heat supply pump 19 and a heat exchange station 20 with unqualified heat supply quality.
A heat supply steam extraction outlet of the thermoelectric unit 11 is connected with a steam side inlet of a heat supply first station steam-water heat exchanger 12, and a steam side outlet of the heat supply first station steam-water heat exchanger 12 is connected with a condensed water treatment device of the thermoelectric unit 11;
a water supply outlet of the steam-water heat exchanger 12 of the heat supply initial station is connected with a main water supply pipeline, a plurality of water outlets are formed in the main water supply pipeline, and each water outlet is connected with one heat exchange station; and a return water inlet of the heat supply primary station steam-water heat exchanger 12 is connected with a return water main pipeline, and a primary station circulating pump 16 is arranged on the return water main pipeline.
The water outlet of each heat exchange station is connected with the inlet of a first station circulating pump 16 on a main return water pipeline, and the water outlet of the first station circulating pump 16 is connected with the return water inlet of the heat supply first station steam-water heat exchanger 12.
And a water supply inlet of the heat exchange station 20 with the heat supply quality not reaching the standard is connected with a main water supply pipeline through a first valve 1.
And a backwater outlet of the heat exchange station 20 with unqualified heat supply quality is connected with a backwater main pipeline through a second valve 2.
The heat storage electric boiler comprises an electrode boiler and a heat storage water tank, wherein a water outlet of the electrode boiler 13 is connected with an inlet of a ninth valve 9, an outlet of the ninth valve 9 is connected with a high-temperature side water inlet of a plate heat exchanger 14, a high-temperature side water outlet of the plate heat exchanger 14 is connected with an inlet of a boiler circulating pump 17, an outlet of the boiler circulating pump 17 is connected with an inlet of a tenth valve 10, and an outlet of the tenth valve 10 is connected with a water inlet of the electrode boiler 13; the boiler circulation pump 17 provides the water circulation power of the electrode boiler 13.
And a low-temperature side water outlet of the plate heat exchanger 14 is connected with an inlet of the seventh valve 7, and a low-temperature side water inlet of the plate heat exchanger 14 is connected with an outlet of the eighth valve 8.
The outlet of the seventh valve 7 is divided into two paths, one path is connected with the inlet of the fifth valve 5, and the other path is connected with the inlet of the heat supply pump 19.
The inlet of the eighth valve 8 is respectively connected with the outlet of the third valve 3 and the outlet of the heat accumulation pump 18.
The high-temperature water inlet and outlet of the heat storage water tank 15 are connected with the fifth valve 5, and the low-temperature water inlet and outlet of the heat storage water tank 15 are connected with the sixth valve 6.
The outlet of the sixth valve 6 is connected with the inlet of the heat accumulation pump 18.
The heat storage pump 18 provides water circulation power in an energy storage mode, and when the heat storage water tank 15 releases heat, the heat storage pump 18 is stopped to be taken as a straight pipe section.
The outlet of the heat supply pump 19 is connected with the inlet of the fourth valve 4, and the outlet of the fourth valve 4 is connected with the water inlet of the high-temperature water side of the heat exchange station 20 with the heat supply quality not reaching the standard.
And the inlet of the third valve 3 is connected with the high-temperature water side water outlet of the heat exchange station 20 with the heat supply quality not reaching the standard.
The invention has different operation modes according to different heat supply periods;
in the early and late cold periods, the water inlets and the water outlets of the third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the seventh valve 7, the eighth valve 8, the ninth valve 9, the tenth valve 10 and the electrode boiler 13 are all in a closed state, the first valve 1 and the second valve 2 are opened, the heat storage electric boiler is not put into operation, and the thermoelectric unit 11 bears all heat loads, including the heat load of the heat exchange station 20 with the heat supply quality not reaching the standard;
in a severe cold period or when a pipe network fault needs to cut out the heat load of the heat exchange station 20 with the heat supply quality not reaching the standard, the first valve 1 and the second valve 2 are closed, the thermoelectric unit 11 bears all the heat loads except the heat exchange station 20 with the heat supply quality not reaching the standard, and the heat load of the heat exchange station 20 with the heat supply quality not reaching the standard is borne by the heat storage electric boiler;
in this period, the heating system of the invention has two operation working conditions;
under a first working condition, during off-peak electricity, the electrode boiler 13 is started, the third valve 3, the fourth valve 4, the fifth valve 5, the sixth valve 6, the seventh valve 7, the eighth valve 8, the ninth valve 9 and the tenth valve 10 are opened, the heat supply pump 19 and the heat storage pump 18 are in a running state, high-temperature water at an outlet of the electrode boiler 13 enters an inlet at the high-temperature side of the plate heat exchanger 14, and after heat exchange in the plate heat exchanger 14, the high-temperature water returns to the electrode boiler 13 from an outlet at the high-temperature side of the plate heat exchanger 14 through a boiler circulating pump 17 to perform next cycle; the water supply at the low temperature side of the plate heat exchanger 14 is divided into two paths after passing through a seventh valve 7, one path enters a heat exchange station 20 with unqualified heat supply quality for heat exchange through a heat supply pump 19, the return water of the heat exchange station returns to a return water pipeline in front of an inlet of an eighth valve 8 through a fourth valve 4, converges with the return water of a heat storage water tank 15, enters the plate heat exchanger 14 through the eighth valve 8 and enters the next cycle; the other path of the heat is introduced into the heat storage water tank 15 through the fifth valve 5, heat is stored in the heat storage water tank 15 in a high-temperature hot water mode, namely the heat storage water tank 15 is in an energy storage mode, the high-temperature hot water is injected into the heat storage water tank 15, the original low-temperature water in the water tank is discharged out of the heat storage water tank 15 from the low-temperature water outlet, the low-temperature water enters the heat storage pump 18 through the sixth valve 6, the low-temperature water flowing out of the heat storage pump 18 is converged with the return water of the heat supply quality unqualified heat exchange station 20, and then enters the plate.
The second working condition is adopted in the peak leveling period, the electrode boiler 13 stops running, the seventh valve 7, the eighth valve 8, the ninth valve 9 and the tenth valve 10 are closed, the third valve 3, the fourth valve 4, the fifth valve 5 and the sixth valve 6 are opened, the heat storage pump 18 stops running, the heat supply pump 19 is in a running state, and the heat storage water tank 15 enters a heat release mode; the high-temperature hot water in the hot water storage tank 15 is supplied to the outside from an upper water outlet (a high-temperature hot water inlet in the energy storage mode), enters the heat exchange station 20 with the unqualified heat supply quality through the heat supply pump 19 for heat exchange, and the return water of the heat exchange station 20 with the unqualified heat supply quality flows back to the hot water storage tank 15 from a lower water inlet (a low-temperature hot water outlet in the energy storage mode) of the hot water storage tank 15 through the hot water storage pump (the operation is stopped at the moment, and the straight pipe section can be considered).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The heating system of the thermoelectric unit coupled distributed heat storage electric boiler is characterized by comprising a thermoelectric unit (11) and a heat storage electric boiler, wherein a heat supply extraction outlet of the thermoelectric unit (11) is connected with a steam side inlet of a heat supply first station steam-water heat exchanger (12), and a steam side outlet of the heat supply first station steam-water heat exchanger (12) is connected with a condensed water treatment device of the thermoelectric unit; a water supply outlet of the steam-water heat exchanger (12) of the heat supply initial station is connected with a main water supply pipeline; a plurality of water outlets are arranged on the main water supply pipeline, and each water outlet is connected with a heat exchange station;
a return water inlet of the steam-water heat exchanger (12) of the heat supply initial station is connected with a return water main pipeline; the return water main pipeline is connected with a return water outlet of each heat exchange station;
and the heat exchange stations with unqualified heat supply quality in the plurality of heat exchange stations are also connected with a heat storage electric boiler.
2. The heating system of the thermoelectric unit coupled distributed heat storage electric boiler as claimed in claim 1, wherein a return water inlet of the heat supply head station steam-water heat exchanger (12) is provided with a head station circulating pump (16).
3. The heating system of the thermoelectric unit coupled distributed heat accumulation electric boiler as claimed in claim 1, wherein the heat accumulation electric boiler comprises an electrode boiler (13), wherein a water outlet of the electrode boiler (13) is connected with a high-temperature side water inlet of a plate heat exchanger (14); a high-temperature side water outlet of the plate heat exchanger (14) is connected with a water inlet of the electrode boiler (13); a low-temperature side water outlet of the plate heat exchanger (14) is connected with a water inlet of a heat exchange station with unqualified heat supply quality; and a low-temperature side water inlet of the plate heat exchanger (14) is connected with a water outlet of the heat exchange station with unqualified heat supply quality.
4. A heating system of a thermoelectric-unit-coupled distributed heat-accumulating electric boiler as claimed in claim 3, wherein the heat-accumulating electric boiler further comprises a heat-accumulating water tank (15), wherein the electrode boiler (13) is connected to the heat-accumulating water tank (15); a high-temperature water outlet of the heat storage water tank (15) is connected with a water inlet of the heat exchange station, the heat supply quality of which does not reach the standard; and a water return port of the heat exchange station with unqualified heat supply quality is connected with a low-temperature water inlet of a heat storage water tank (15).
5. The heating system of the thermoelectric unit coupled distributed heat storage electric boiler as claimed in claim 1, wherein a water return inlet of the heat supply head station steam-water heat exchanger (12) is provided with a head station circulating pump (16);
the heat storage electric boiler comprises an electrode boiler (13), wherein a water outlet of the electrode boiler (13) is connected with a high-temperature side water inlet of a plate heat exchanger (14); a high-temperature side water outlet of the plate heat exchanger (14) is connected with a water inlet of the electrode boiler (13); a low-temperature side water outlet of the plate heat exchanger (14) is connected with a water inlet of a heat exchange station with unqualified heat supply quality; a low-temperature side water inlet of the plate heat exchanger (14) is connected with a water outlet of a heat exchange station with unqualified heat supply quality;
the heat accumulation electric boiler also comprises a heat accumulation water tank (15), wherein the electrode boiler (13) is connected with the heat accumulation water tank (15); a high-temperature water outlet of the heat storage water tank (15) is connected with a water inlet of the heat exchange station, the heat supply quality of which does not reach the standard; and a water return port of the heat exchange station with unqualified heat supply quality is connected with a low-temperature water inlet of a heat storage water tank (15).
6. A heating method of a thermoelectric unit coupled distributed heat storage electric boiler, which is based on the heating system of the thermoelectric unit coupled distributed heat storage electric boiler of any one of claims 1 to 5, and comprises the following steps:
according to the heating period, two operation modes are divided:
when the heat supply period is the initial and final cold periods, the heat storage electric boiler is in an off-state, the thermoelectric generator set (11) is put into operation, and heat is supplied to each heat exchange station through the thermoelectric generator set (11);
when the heat supply period is a high and cold period or a pipe network fault, the heat storage electric boiler and the thermoelectric unit (11) are both put into operation, heat is supplied to the heat exchange station with the heat supply quality not up to the standard through the heat storage electric boiler, and the thermoelectric unit (11) supplies heat to the rest heat exchange stations.
7. The heat supply method of the thermoelectric unit coupled distributed heat storage electric boiler as claimed in claim 6, characterized in that in the heat supply alpine period, when the electrode boiler (13) is put into operation, the thermoelectric unit (11) is put into operation, and the valley electricity is generated, the high-temperature water in the electrode boiler (13) enters the high-temperature side inlet of the plate heat exchanger (14), the low-temperature side outlet of the plate heat exchanger (14) is divided into two paths, wherein one path enters the heat storage water tank (15) for heat storage, and the other path supplies heat to the heat exchange station with unqualified heat supply mass; and heat is supplied to the rest heat exchange stations through a thermoelectric power unit (11).
8. The heating method of the thermoelectric unit coupled distributed heat accumulation electric boiler as claimed in claim 7, wherein during the high and cold period of heating, when the electrode boiler (13) is shut down, the thermoelectric unit (11) is put into operation, and the peak is leveled, the heat accumulation water tank (15) enters into the heat release mode to supply heat to the heat exchange station with unqualified heat supply quality; the thermoelectric power unit (11) supplies heat to the rest of the thermoelectric power station.
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