CN113669775A - Low-entropy-increase double-gradient efficient comprehensive heating system - Google Patents
Low-entropy-increase double-gradient efficient comprehensive heating system Download PDFInfo
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- CN113669775A CN113669775A CN202110769446.0A CN202110769446A CN113669775A CN 113669775 A CN113669775 A CN 113669775A CN 202110769446 A CN202110769446 A CN 202110769446A CN 113669775 A CN113669775 A CN 113669775A
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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
- F24D11/004—Central heating systems using heat accumulated in storage masses water heating system with conventional supplementary heat source
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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
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The application provides a double-gradient efficient comprehensive heat supply system with low entropy increase, which comprises a medium-temperature water tank water inlet pipeline, a medium-temperature water tank water outlet pipeline, a high-temperature water tank water inlet pipeline, a high-temperature water tank water outlet pipeline, a drinking water inlet pipeline, a high-temperature drinking water outlet pipeline, a low-temperature drinking water tank, a boiling drinking water tank, a pressure-relief drinking water tank, a medium-temperature water tank, a high-temperature water tank, a medium-temperature heating heat exchanger, a high-temperature condenser, a medium-temperature heat-dissipation heat exchanger, a low-temperature heat-dissipation heat exchanger, a boiling water tank check valve, a pressure-relief water tank check valve and a pressure-relief water tank safety valve. The system provided by the application realizes the grading of the heating process, can adopt heat sources with different qualities and different heating modes to carry out grading heat supply, and improves the comprehensive heating efficiency; the multistage heat recovery is realized, the heat energy loss is reduced to the maximum extent, and the comprehensive heat utilization rate is improved.
Description
Technical Field
The invention belongs to the field of comprehensive energy, and particularly relates to a low-entropy-increase double-gradient efficient comprehensive heat supply system.
Background
In the scenes of business, residents and the like, heat demands with different qualities and different purposes exist, such as air conditioning heat, high-temperature heat supply demands, domestic hot water, drinking hot water and the like, the heat demands are obtained by directly converting high-quality heat sources such as electricity, gas and the like at present, the conversion efficiency is limited, meanwhile, the waste heat utilization in the heat utilization process is low, and the comprehensive efficiency of the system still has a rising space.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-grade efficient comprehensive heating system with low entropy increase.
The embodiment of the application discloses a low-entropy-increase double-gradient high-efficiency comprehensive heat supply system, which comprises a medium-temperature water tank water inlet pipeline, a medium-temperature water tank water outlet pipeline, a high-temperature water tank water inlet pipeline, a high-temperature water tank water outlet pipeline, a drinking water inlet pipeline, a high-temperature drinking water outlet pipeline, a low-temperature drinking water tank, a boiling drinking water tank, a pressure-relief drinking water tank, a medium-temperature water tank, a high-temperature water tank, a medium-temperature heating heat exchanger, a high-temperature condenser, a medium-temperature heat-dissipating heat exchanger, a low-temperature heat-dissipating heat exchanger, a boiling water tank check valve, a pressure-relief water tank safety valve and an electric heater;
furthermore, a drinking water inlet pipeline is connected with a drinking water supply source and the water inlet of the low-temperature drinking water tank, and the water inlet of the medium-temperature heating heat exchanger is connected with the water outlet of the low-temperature drinking water tank; the water outlet of the medium-temperature heating heat exchanger is connected with the water inlet of the high-temperature heating heat exchanger, the water outlet of the high-temperature heating heat exchanger is connected with the water inlet of a boiling water tank check valve, the water outlet of the boiling water tank check valve is connected with the water inlet of a boiling drinking water tank, the water outlet of the boiling drinking water tank is connected with the water inlet of a high-temperature condenser, the water outlet of the high-temperature condenser is connected with the water inlet of a pressure-relief drinking water tank, the water outlet of the pressure-relief drinking water tank is connected with a pressure-relief water tank safety valve, the water outlet of the pressure-relief water tank check valve is respectively connected with a high-temperature drinking water outlet pipeline and the water inlet of the medium-temperature heat-dissipation heat exchanger, the water outlet of the medium-temperature heat-dissipation heat exchanger is connected with the water inlet of the low-temperature heat-dissipation heat exchanger, and the water outlet of the low-temperature drinking water outlet pipeline are connected with the low-temperature drinking water outlet pipeline; the low-temperature heat-dissipation heat exchanger is placed in the low-temperature drinking water tank, the high-temperature heating heat exchanger and the high-temperature condenser are placed in the high-temperature water tank, the electric heater is placed in the boiling drinking water tank, and the medium-temperature heating heat exchanger and the medium-temperature heat-dissipation heat exchanger are placed in the medium-temperature water tank; the medium temperature water tank inlet pipeline is connected with the water inlet of the medium temperature water tank, the medium temperature water tank outlet pipeline is connected with the water outlet of the medium temperature water tank, the high temperature water tank inlet pipeline is connected with the water inlet of the high temperature water tank, and the high temperature water tank outlet pipeline is connected with the water outlet of the high temperature water tank.
The utility model provides a two grades of high-efficient heating system of synthesizing of low entropy increase that this application adopted, through above-mentioned technical scheme, the beneficial effect of this application is:
the grading of the heating process is realized, heat sources with different qualities and different heating modes can be adopted for graded heat supply, and the comprehensive heating efficiency is improved; the multistage heat recovery is realized, the heat energy loss is reduced to the maximum extent, and the comprehensive heat utilization rate is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a low-entropy-increase double-gradient efficient integrated heating system provided in an embodiment of the present application;
reference numerals:
101-medium temperature water tank water inlet pipeline, 102-medium temperature water tank water outlet pipeline, 103-high temperature water tank water inlet pipeline, 104-high temperature water tank water outlet pipeline, 201-drinking water inlet pipeline, 202-high temperature drinking water outlet pipeline, 203-low temperature drinking water outlet pipeline, 301-low temperature drinking water tank, 302-boiling drinking water tank, 303-pressure relief drinking water tank, 401-medium temperature water tank, 402-high temperature water tank, 501-medium temperature heating heat exchanger, 502-high temperature heating heat exchanger, 503-high temperature condenser, 504-medium temperature heat exchanger, 505-low temperature heat exchanger, 601-boiling water tank one-way valve, 602-pressure relief water tank one-way valve, 603-pressure relief water tank safety valve, 604-electric heater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Please refer to fig. 1, which is a schematic diagram of a low-entropy-increase dual-gradient efficient integrated heat supply system according to an embodiment of the present disclosure, in which the system according to this embodiment includes a medium-temperature water tank inlet pipe 101, a medium-temperature water tank outlet pipe 102, a high-temperature water tank inlet pipe 103, a high-temperature water tank outlet pipe 104, a drinking water inlet pipe 201, a high-temperature drinking water outlet pipe 202, a low-temperature drinking water outlet pipe 203, a low-temperature drinking water tank 301, a boiling drinking water tank 302, a pressure-relief drinking water tank 303, a medium-temperature water tank 401, a high-temperature water tank 402, a medium-temperature heating heat exchanger 501, a high-temperature heating heat exchanger 502, a high-temperature condenser 503, a medium-temperature heat-dissipation heat exchanger 504, a low-temperature heat-dissipation heat exchanger 505, a boiling water tank check valve 601, a pressure-relief water tank check valve 602, a pressure-relief water tank safety valve 603, and an electric heater 604.
Further, the drinking water inlet pipeline 201 is connected with a drinking water supply source and a water inlet of the low-temperature drinking water tank 301, and a water inlet of the medium-temperature heating heat exchanger 501 is connected with a water outlet of the low-temperature drinking water tank 301; the water outlet of the medium-temperature heating heat exchanger 501 is connected with the water inlet of the high-temperature heating heat exchanger 502, the water outlet of the high-temperature heating heat exchanger 502 is connected with the water inlet of a boiling water tank check valve 601, the water outlet of the boiling water tank check valve is connected with the water inlet of a boiling drinking water tank 302, the water outlet of the boiling drinking water tank 302 is connected with the water inlet of a high-temperature condenser 503, the water outlet of the high-temperature condenser 503 is connected with the water inlet of a pressure-relief drinking water tank 303, the water outlet of the pressure-relief drinking water tank 303 is connected with the water inlet of a pressure-relief water tank check valve 602, the water outlet of the pressure-relief drinking water tank 303 is connected with a pressure-relief water tank safety valve 603, the water outlet of the pressure-relief water tank check valve 602 is respectively connected with the water inlet of a high-temperature drinking water outlet pipeline 202 and a medium-temperature heat-dissipation heat exchanger 504, the water outlet of the medium-temperature heat exchanger 504 is connected with the water inlet of a low-temperature heat-dissipation heat exchanger 505, and the water outlet of the low-temperature heat-dissipation heat exchanger 505 is connected with a low-temperature drinking water outlet pipeline 203; a low-temperature heat-dissipation heat exchanger 505 is placed in the low-temperature drinking water tank 301, a high-temperature heating heat exchanger 502 and a high-temperature condenser 503 are placed in the high-temperature water tank 402, an electric heater 604 is placed in the boiling drinking water tank 302, and a medium-temperature heating heat exchanger 501 and a medium-temperature heat-dissipation heat exchanger 504 are placed in the medium-temperature water tank 401; the medium temperature water tank water inlet pipeline 101 is connected with the water inlet of the medium temperature water tank 401, the medium temperature water tank water outlet pipeline 102 is connected with the water outlet of the medium temperature water tank 401, the high temperature water tank water inlet pipeline 103 is connected with the water inlet of the high temperature water tank 402, and the high temperature water tank water outlet pipeline 104 is connected with the water outlet of the high temperature water tank 402.
The application provides a low entropy increases double-ladder high-efficient comprehensive heating system's operation process does: the low-temperature drinking water is sent to the low-temperature drinking water tank 301 through the drinking water inlet pipeline 201 and is subjected to heat exchange with circulating warm water in the low-temperature heat dissipation heat exchanger 505 for primary heating; the primarily heated drinking water enters the medium-temperature heating heat exchanger through the water outlet of the low-temperature drinking water tank 301, and is further heated by heat exchange with medium-temperature hot water in the medium-temperature water tank 401; the further heated drinking water enters the high-temperature heating heat exchanger 502 to exchange heat with the high-temperature hot water in the high-temperature water tank 402 and is heated to a high temperature; the drinking water heated to high temperature enters the boiling drinking water tank 302 through the boiling water tank check valve 601 and is heated to boiling by the electric heater 604;
further, water vapor generated by the drinking water heated to boiling by the electric heater 604 enters the high-temperature condenser 503, is condensed after exchanging heat with high-temperature water in the high-temperature water tank 402, and the condensed drinking water enters the pressure-relief drinking water tank 303;
further, the high-temperature condensed water in the pressure-relief drinking water tank 303 is supplied out from the high-temperature drinking water outlet pipeline 202 through the pressure-relief water tank check valve 602, so as to provide high-temperature distilled water for a user; meanwhile, high-temperature condensed water in the pressure-relief drinking water tank 303 enters the medium-temperature heat-dissipation heat exchanger 504 through the one-way valve 602 to exchange heat with medium-temperature water in the medium-temperature water tank 401 for further cooling; the further cooled drinking water enters the low-temperature heat dissipation heat exchanger 505 to exchange heat with the low-temperature drinking water in the low-temperature drinking water tank 301 to be cooled to normal temperature, and low-temperature distilled water is provided for a user through the low-temperature drinking water outlet pipeline 203;
further, the medium temperature water tank 401 is connected to the medium temperature heat circuit through the medium temperature water tank inlet pipe 101 and the medium temperature water tank outlet pipe 102, and the high temperature water tank 402 is connected to the high temperature heat circuit through the high temperature water tank inlet pipe 103 and the high temperature water tank outlet pipe 104.
Further, the pressure relief tank relief valve 603 is used to keep the pressure of the pressure relief drinking water tank 303, high temperature condenser 503 and boiling drinking water tank 302 at a safe level in the event of incomplete condensation.
To further explain the principles of the present invention, the present application also provides an example of the invention in connection with a specific application of the present system.
Taking an application scene of an energy station as an example, the volumes of a low-temperature drinking water tank 301 and a pressure-relief drinking water tank 303 are 0.05 cubic meter, the volume of a boiling drinking water tank 302 is 0.0.5 cubic meter, the volumes of a medium-temperature water tank 401 and a high-temperature water tank 402 are 1.5 cubic meter, system water pipes are DN25, the water supply pressure of a drinking water inlet pipeline 201 is 0.07MPa, the pressure of a safety valve 603 of the pressure-relief water tank is 0.1MPa, the rated powers of a medium-temperature heating heat exchanger 501, a high-temperature heating heat exchanger 502, a high-temperature condenser 503, a medium-temperature heat-dissipation heat exchanger 504 and a low-temperature heat-dissipation heat exchanger 505 are 5kW, and the heating power of the boiling drinking water tank 302 is 5 kW.
The medium temperature water tank 401 is connected to a heat supply air conditioner closed water circulation system through a medium temperature water tank water inlet pipeline 101 and a medium temperature water tank water outlet pipeline 102, the heat source of the air conditioner system is PVT photovoltaic waste heat and an air source heat pump, the output water temperature of the heat source is 40-50 ℃, and the temperature difference between the outlet water and the return water of the heat source is controlled within 5 ℃; the high-temperature water tank 402 is connected to a domestic hot water open type water supply system through a high-temperature water tank water inlet pipeline 103 and a high-temperature water tank water outlet pipeline 104, the heat sources are an air conditioning system and a photo-thermal system, and the water temperature is controlled to be 70-80 ℃; the water source is at a temperature of about 15 ℃ to 20 ℃.
When the low temperature drinking water outlet pipe 203 or the high temperature drinking water outlet pipe 202 requires water, the low temperature drinking water is supplied to the system through the drinking water inlet pipe 201 due to the water pressure difference. The temperature of the supplied water is initially raised in the low temperature drinking water tank 301, and the temperature raising process is not controlled, and the temperature raising amplitude depends on the temperature and flow rate of the water in the low temperature heat dissipation heat exchanger 505. The primarily heated drinking water enters the medium temperature heating heat exchanger 501 to exchange heat with medium temperature water in the medium temperature water tank 401 to be heated, and the outflow water temperature is about 40 ℃. The drinking water after the secondary temperature rise enters the high-temperature heating heat exchanger 502 to exchange heat with the high-temperature water tank 402 to rise the temperature, and the temperature of the outflow water is about 70 ℃. The drinking water heated for three times enters a boiling drinking water tank 302 and is electrically heated to boil, water vapor enters a high-temperature condenser 503 to exchange heat with a high-temperature water tank 402 for condensation, the temperature of condensed water is about 80 ℃, water vapor which is not condensed under partial working conditions enters a pressure relief drinking water tank 303 to be condensed, and when the pressure exceeds 0.1MPa, the excessive water vapor is released through a pressure relief water tank safety valve 603. The cooled condensed water can flow out from the high-temperature drinking water outlet pipeline 202 to provide high-temperature distilled water at about 80 ℃ for users, or enter the medium-temperature heat-dissipation heat exchanger 504 to further exchange heat with the medium-temperature water tank 401 to cool, and the temperature of the flowing water is about 50 ℃. The condensate water after the secondary temperature reduction enters the low-temperature heat dissipation heat exchanger 505 to exchange heat with the low-temperature drinking water tank 301 for temperature reduction, and flows out through the low-temperature drinking water outlet pipeline 203 after further temperature reduction, so that distilled water at about 30 ℃ is provided for users.
In conclusion, the system realizes that in order to improve the heat supply quality in a grading way, the entropy value of the heating process is reduced to the maximum extent by adopting energy sources with different qualities and a heat improving mode in different grades, and the heating efficiency is improved. Meanwhile, a graded heat supply mode is adopted for treating heat consumption requirements of different qualities, waste heat is utilized to the maximum extent, heat consumption efficiency is improved, and the purpose of improving the comprehensive efficiency of the system is finally achieved.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The double-gradient efficient comprehensive heat supply system with low entropy increase comprises a medium-temperature water tank water inlet pipeline (101), a medium-temperature water tank water outlet pipeline (102), a high-temperature water tank water inlet pipeline (103), a high-temperature water tank water outlet pipeline (104), a drinking water inlet pipeline (201), a high-temperature drinking water outlet pipeline (202), a low-temperature drinking water outlet pipeline (203), a low-temperature drinking water tank (301), a boiling drinking water tank (302), a pressure-relief drinking water tank (303), a medium-temperature water tank (401), a high-temperature water tank (402), a medium-temperature heating heat exchanger (501), a high-temperature heating heat exchanger (502), a high-temperature condenser (503), a medium-temperature heat-dissipation heat exchanger (504), a low-temperature heat-dissipation heat exchanger (505), a boiling water tank check valve (601), a pressure-relief water tank check valve (602), a pressure-relief water tank safety valve (603) and an electric heater (604), and is characterized in that the drinking water inlet pipeline (201) connects a drinking water supply source with the low-temperature drinking water tank (301) A water inlet of the medium-temperature heating heat exchanger (501) is connected with a water outlet of the low-temperature drinking water tank (301); the water outlet of the medium-temperature heating heat exchanger (501) is connected with the water inlet of the high-temperature heating heat exchanger (502), the water outlet of the high-temperature heating heat exchanger (502) is connected with the water inlet of the boiling water tank one-way valve (601), the water outlet of the boiling water tank one-way valve is connected with the water inlet of the boiling drinking water tank (302), the water outlet of the boiling drinking water tank (302) is connected with the water inlet of the high-temperature condenser (503), the water outlet of the high-temperature condenser (503) is connected with the water inlet of the pressure-releasing drinking water tank (303), the water outlet of the pressure-releasing drinking water tank (303) is connected with the water inlet of the pressure-releasing water tank one-way valve (602), the water outlet of the pressure-releasing drinking water tank (303) is connected with the safety valve (603) of the pressure-releasing water tank, and the water outlet of the pressure-releasing water tank one-way valve (602) is respectively connected with the water outlet pipeline (202) of the high-temperature drinking water and the water inlet of the medium-temperature heat-dissipating heat exchanger (504), the water outlet of the medium-temperature heat dissipation heat exchanger (504) is connected with the water inlet of the low-temperature heat dissipation heat exchanger (505), and the water outlet of the low-temperature heat dissipation heat exchanger (505) is connected with the low-temperature drinking water outlet pipeline (203); the low-temperature heat-dissipation heat exchanger (505) is placed in the low-temperature drinking water tank (301), the high-temperature heating heat exchanger (502) and the high-temperature condenser (503) are placed in the high-temperature water tank (402), the medium-temperature heating heat exchanger (501) and the medium-temperature heat-dissipation heat exchanger (504) are placed in the medium-temperature water tank (401), and the electric heater (604) is placed in the boiling drinking water tank (302); the medium-temperature water tank water inlet pipeline (101) is connected with a water inlet of the medium-temperature water tank (401), the medium-temperature water tank water outlet pipeline (102) is connected with a water outlet of the medium-temperature water tank (401), the high-temperature water tank water inlet pipeline (103) is connected with a water inlet of the high-temperature water tank (402), and the high-temperature water tank water outlet pipeline (104) is connected with a water outlet of the high-temperature water tank (402).
2. A low-entropy-increase double-step efficient integrated heating system, according to claim 1, wherein low-temperature drinking water is delivered to the low-temperature drinking water tank (301) through the drinking water inlet pipeline (201) and is subjected to heat exchange primary heating with circulating warm water in the low-temperature heat-dissipation heat exchanger (505); the primarily heated drinking water enters the medium-temperature heating heat exchanger (501) through a water outlet of the low-temperature drinking water tank (301) and is further heated by heat exchange with medium-temperature hot water in the medium-temperature water tank (401); the further heated drinking water enters the high-temperature heating heat exchanger (502) to exchange heat with high-temperature hot water in the high-temperature water tank (402) and is heated to high temperature; the drinking water heated to high temperature enters the boiling drinking water tank (302) through the boiling water tank check valve (601) and is heated to boiling by the electric heater (604).
3. The double-gradient efficient comprehensive heat supply system with low entropy increase of claim 2, wherein water vapor generated by drinking water heated to boiling by the electric heater (604) enters the high-temperature condenser (503), is condensed after heat exchange with high-temperature water in the high-temperature water tank (402), and the condensed drinking water enters the pressure-relief drinking water tank (303).
4. The double-gradient efficient comprehensive heat supply system with low entropy increase of claim 3, wherein high-temperature condensed water in the pressure-relief drinking water tank (303) is supplied out from the high-temperature drinking water outlet pipeline (202) through the pressure-relief water tank check valve (602) to provide high-temperature distilled water for a user; meanwhile, high-temperature condensed water in the pressure-relief drinking water tank (303) enters the medium-temperature heat-dissipation heat exchanger (504) through the pressure-relief water tank one-way valve (602) and is subjected to heat exchange with medium-temperature water in the medium-temperature water tank (401) to further reduce the temperature.
5. The double-gradient efficient comprehensive heat supply system with low entropy increase of claim 4, wherein the further cooled drinking water enters the low-temperature heat dissipation heat exchanger (505) to exchange heat with the low-temperature drinking water in the low-temperature drinking water tank (301) to be cooled to normal temperature, and low-temperature distilled water is provided for a user through the low-temperature drinking water outlet pipeline (203).
6. The double-gradient efficient comprehensive heat supply system with low entropy increase of the claim 1, wherein the medium temperature water tank (401) is connected to a medium temperature heat circuit through the medium temperature water tank inlet pipe (101) and the medium temperature water tank outlet pipe (102); the high-temperature water tank (402) is connected to a high-temperature heat circuit through a high-temperature water tank water inlet pipeline (103) and a high-temperature water tank water outlet pipeline (104).
7. A low entropy increase, double-step efficient district heating system as claimed in claim 1, wherein the pressure relief tank safety valve (603) is used to keep the pressure of the pressure relief drinking water tank (303), high temperature condenser (503) and boiling drinking water tank (302) at a safe level in case of incomplete condensation.
8. The double-gradient efficient integrated heating system with low entropy increase is characterized in that low-temperature drinking water is sent to the low-temperature drinking water tank (301) through the drinking water inlet pipeline (201) and is subjected to heat exchange primary heating with circulating warm water in the low-temperature heat dissipation heat exchanger (505); the primarily heated drinking water enters the medium-temperature heating heat exchanger (501) through a water outlet of the low-temperature drinking water tank (301) and is further heated by heat exchange with medium-temperature hot water in the medium-temperature water tank (401); the further heated drinking water enters the high-temperature heating heat exchanger (502) to exchange heat with high-temperature hot water in the high-temperature water tank (402) and is heated to high temperature; the drinking water heated to high temperature enters the boiling drinking water tank (302) through the boiling water tank one-way valve (601) and is heated to boiling by the electric heater (604); steam generated by drinking water heated to boiling by the electric heater (604) enters the high-temperature condenser (503), is condensed after heat exchange with high-temperature water in the high-temperature water tank (402), and the condensed drinking water enters the pressure-relief drinking water tank (303); high-temperature condensed water in the pressure-relief drinking water tank (303) is supplied out from the high-temperature drinking water outlet pipeline (202) through the one-way valve (602) of the pressure-relief water tank, so as to provide high-temperature distilled water for a user; meanwhile, high-temperature condensed water in the pressure-relief drinking water tank (303) enters the medium-temperature heat-dissipation heat exchanger (504) through a pressure-relief water tank check valve (602) to exchange heat with medium-temperature water in the medium-temperature water tank (401) for further cooling; the further cooled drinking water enters the low-temperature heat dissipation heat exchanger (505) to exchange heat with the low-temperature drinking water in the low-temperature drinking water tank (301) to be cooled to normal temperature, and low-temperature distilled water is provided for a user through the low-temperature drinking water outlet pipeline (203); the medium-temperature water tank (401) is connected to a medium-temperature heat circuit through the medium-temperature water tank water inlet pipeline (101) and the medium-temperature water tank water outlet pipeline (102), and the high-temperature water tank (402) is connected to a high-temperature heat circuit through the high-temperature water tank water inlet pipeline (103) and the high-temperature water tank water outlet pipeline (104).
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