CN114543149A - System for long-distance heat supply by using air and operation method - Google Patents
System for long-distance heat supply by using air and operation method Download PDFInfo
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- CN114543149A CN114543149A CN202210211545.1A CN202210211545A CN114543149A CN 114543149 A CN114543149 A CN 114543149A CN 202210211545 A CN202210211545 A CN 202210211545A CN 114543149 A CN114543149 A CN 114543149A
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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
- F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
- F24D5/06—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated
- F24D5/08—Hot-air central heating systems; Exhaust gas central heating systems operating without discharge of hot air into the space or area to be heated with hot air led through radiators
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
Abstract
The invention discloses a system for long-distance heat supply by using air and an operation method, wherein the system comprises a motor and the like; the motor is connected with the compressor through a shaft, the outlet of the compressor is connected with the air inlet of the heat supply network initial station heat exchanger through a compressor outlet pipeline, the air outlet of the heat supply network initial station heat exchanger is connected with the inlet of the heat supply network user side heat exchanger, and the outlet of the heat supply network user side heat exchanger is connected with the air exhaust pipeline of the heat supply network user side heat exchanger; the steam inlet of the heat exchanger at the first station of the heat supply network is connected with a front steam extraction pipeline of a steam extraction gate valve, and the steam outlet of the heat exchanger at the first station of the heat supply network is connected with the inlet of a condenser from the heat exchanger at the first station of the heat supply network to the condenser pipeline through a water steam side. The method comprises a circulation process of two working mediums, wherein the 1 st working medium circulation is an extraction circulation adopted in extraction heat release circulation of various turbines for power generation in a thermal power plant or a nuclear power plant; the 2 nd working medium circulation is long-distance heat supply circulation taking air as a heat-carrying working medium. The invention can supply heat in long distance.
Description
Technical Field
The invention belongs to the technical field of long-distance heat supply of a thermal power plant or a nuclear power plant, and particularly relates to a system for long-distance heat supply by using air and an operation method.
Background
With the development of social economy, the demand of people in all trades on winter heating is increasingly urgent. The existing heat supply mode that the heat supply only aims at urban centralized users is difficult to meet the current social needs. More and more vast rural areas are on the way of meeting the demand of heat supply in winter by governments. Due to the characteristics that the infrastructure of the population residence is lagged behind, the residence positions are scattered, the distance from a heat source point is far and the like, the heat consumers in vast rural areas can enjoy the convenience of heat supply of the heat source point less in the past. In order to supply heat to the heat users in vast rural areas far away from the heat source point, the long-distance heat supply technology must be fully researched.
The long-distance heat supply technology is researched more by science and technology workers in China at present. For example, a single-pipe non-return long-distance heat-transporting waste heat centralized heating system with patent number CN201920500085.8 provides a single-pipe non-return long-distance heat-transporting waste heat centralized heating system, which is characterized by comprising a water source system, a heat source system, a pipeline conveying system, a pressure-relief power generation system, a secondary heat exchange system and a heat pump lifting system; the water source system takes river water as a heat exchange medium, the river water is treated by a sedimentation tank and a descaling antiscaling device and then is sent into a flue gas waste heat exchanger, an exhaust steam waste heat exchanger and a gas turbine air exhaust heat exchanger of the heat source system to be heated, the river water is conveyed for a long distance through a large-pipe-diameter steel pipe of the pipeline conveying system, is subjected to power generation by a water turbine generator set of the pressure relief power generation system and reduces the pressure of a pipeline, is conveyed to a heat exchanger of the secondary heat exchange system to exchange heat with secondary water, and is subjected to heat exchange by the heat pump lifting system to reduce the initial temperature to be discharged into a river channel. This patent adopts the river course water to carry out long distance single tube heat transmission. Although investment can be reduced by single-pipe heat transmission, river water is adopted as a heat carrying medium, the system is complex, and investment maintenance and the like are not easy to control.
Disclosure of Invention
The invention aims to provide a system and an operation method for long-distance heat supply by utilizing air.
The invention is realized by adopting the following technical scheme:
a system for long-distance heat supply by using air comprises a motor, a gas compressor, a heat exchanger at the head of a heat supply network, a condenser, a heat exchanger at the user side of the heat supply network and an air filter;
the motor is connected with the compressor through a shaft, the outlet of the compressor is connected with the air inlet of the heat supply network initial station heat exchanger through a compressor outlet pipeline, the air outlet of the heat supply network initial station heat exchanger is connected with the inlet of the heat supply network user side heat exchanger, and the outlet of the heat supply network user side heat exchanger is connected with the air exhaust pipeline of the heat supply network user side heat exchanger;
the steam inlet of the heat exchanger at the first station of the heat supply network is connected with a front steam extraction pipeline of a steam extraction gate valve, and the steam outlet of the heat exchanger at the first station of the heat supply network is connected with the inlet of a condenser from the heat exchanger at the first station of the heat supply network to the condenser pipeline through a water steam side.
The invention further improves the structure that the structure also comprises an air filter, and an outlet of the air filter is connected with an inlet of the compressor through an inlet pipeline of the compressor.
The invention is further improved in that a steam extraction gate valve is arranged on a steam extraction pipeline in front of the steam extraction gate valve and used for controlling the steam extraction flow entering the heat exchanger at the first station of the heat supply network.
A further development of the invention is that the electric motor connected to the compressor via a shaft can be replaced by a small steam turbine.
In a further development of the invention, the system comprises a closed cycle of the steam extraction and heat release cycle of the steam turbine and an open cycle of the air heating cycle.
The invention is further improved in that the temperature of the air after heat absorption from the heat supply network initial heat exchanger can be adjusted according to the actual heat exchange load of the heat supply network user side heat exchanger.
The invention is further improved in that the air filter is used for filtering impurities in the air and is cleaned regularly to avoid causing blockage of the air filter.
An operation method for long-distance heat supply by utilizing air is based on the system for long-distance heat supply by utilizing air, and comprises a circulation process of two working media, wherein the 1 st working medium circulation is a steam extraction circulation adopted in the steam extraction and heat release circulation of various types of turbines for power generation in a thermal power plant or a nuclear power plant, is called as steam extraction and heat release circulation of a turbine for short, and is a closed circulation; the 2 nd working medium circulation is long-distance heat supply circulation taking air as a heat-carrying working medium, is called air heat supply circulation for short, and is an open circulation;
aiming at the steam extraction heat release circulation of a steam turbine, the method comprises the following operation steps:
step 1: steam is extracted by the steam turbine and flows through a steam extraction pipeline in front of the steam extraction gate valve, and then the steam turbine enters the step 2;
step 2: the steam flowing through the steam extraction gate valve continuously flows through a steam extraction pipeline behind the steam extraction gate valve, enters a heat supply network first-station heat exchanger, releases heat to air in the heat supply network first-station heat exchanger, releases heat in the heat supply network first-station heat exchanger, and then is converted into condensed water after being extracted, and the step 3 is carried out;
and step 3: condensed water condensed after steam extraction and heat release in the heat exchanger at the first station of the heat supply network flows through the heat exchanger at the first station of the heat supply network to a condenser pipeline and enters a condenser, and the condensed water in the condenser continuously participates in thermodynamic cycle of a power plant;
aiming at the air heating circulation, the following operation steps are provided:
step 1: air enters an air filter for filtering by means of suction force of an inlet of the air compressor, and then the step 2 is carried out;
step 2: air filtered in the air filter enters the air compressor through an inlet pipeline of the air compressor to be compressed, and the step 3 is carried out;
and step 3: the air compressed in the air compressor flows through an outlet pipeline of the air compressor, enters a heat exchanger at the first station of the heat supply network to absorb steam extraction and release heat, absorbs the air with heat, is converted into hot air, and then enters step 4;
and 4, step 4: the air absorbing heat in the heat exchanger at the first station of the heat supply network, namely the hot air, flows through the long-distance air transmission pipeline, long-distance transmission is carried out by depending on the pressure of the air lifted in the air compressor, and the hot air after long-distance transmission enters the step 5;
and 5: the hot air after long-distance transmission enters the heat exchanger at the user side of the heat supply network to release heat to the user, the hot air after heat release is converted into cold air, and the cold air is exhausted into the atmosphere again through the heat exchanger at the user side of the heat supply network to the air exhaust pipeline.
The invention has at least the following beneficial technical effects:
the system and the operation method for long-distance heat supply by using air can perform long-distance heat supply by using good diffusivity and compressibility of the air as a heat-carrying medium.
Further, the steam turbine can extract steam as the selectivity of the heat source. As the heat source for absorbing heat by air, other various heat sources with afterheat properties can be selected, such as heat generated by municipal waste incineration, tail flue gas afterheat of a boiler of a thermal power plant and the like.
In conclusion, the invention adopts air as the heat-carrying working medium, the system is simple, the work is reliable, and the air after heat release is discharged into the atmosphere again, so that greenhouse gases are not generated, and the air content in the atmosphere is not reduced; in addition, the air can release heat for a hot user with large fall by utilizing the self pressure and the good diffusivity of the gas, and the invention fully embodies the characteristics of conciseness, practicability, convenience and economy.
Drawings
FIG. 1 is a schematic diagram of the thermodynamic system of the present invention.
Description of reference numerals:
1. the system comprises a motor, 2, a compressor, 3, a heat supply network head station heat exchanger, 4, a condenser, 5, a heat supply network user side heat exchanger, 6, an air filter, 7, a steam extraction gate valve, L1, a steam extraction pipeline in front of the steam extraction gate valve, L2, a steam extraction pipeline behind the steam extraction gate valve, L3, a steam side heat supply network head station heat exchanger to condenser pipeline, A1, a compressor inlet pipeline, A2, a compressor outlet pipeline, A3, an air long-distance pipeline, A4, a heat supply network user side heat exchanger to air exhaust pipeline, S1 and a shaft.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a system for long distance heating using air, comprising: the system comprises a motor 1, a compressor 2, a heat supply network head station heat exchanger 3, a condenser 4, a heat supply network user side heat exchanger 5, an air filter 6, a steam extraction gate valve 7, a steam extraction pipeline L1 in front of the steam extraction gate valve, a steam extraction pipeline L2 behind the steam extraction gate valve, a pipeline from the steam side heat supply network head station heat exchanger to the condenser L3, a compressor inlet pipeline A1, a compressor outlet pipeline A2, an air long-distance pipeline A3, an air exhaust pipeline A4 and a shaft S1.
The motor 1 is connected with the compressor 2 through a shaft S1, the outlet of the compressor 2 is connected with the air inlet of the heat supply network first-station heat exchanger 3 through a compressor outlet pipeline A2, the air outlet of the heat supply network first-station heat exchanger 3 is connected with the inlet of the heat supply network user side heat exchanger 5, and the outlet of the heat supply network user side heat exchanger 5 is connected with the air exhaust pipeline A4 of the heat supply network user side heat exchanger; a steam inlet of the heat supply network head station heat exchanger 3 is connected with a front steam extraction pipeline L1 of a steam extraction gate valve, and a steam outlet of the heat supply network head station heat exchanger 3 is connected with an inlet of a condenser 4 through a pipeline L3 from the water steam side heat supply network head station heat exchanger to the condenser; the outlet of the air filter 6 is connected to the inlet of the compressor 2 via a compressor inlet conduit a 1. In addition, a steam extraction gate valve 7 is arranged on the steam extraction pipeline L1 in front of the steam extraction gate valve and is used for controlling the steam extraction flow entering the heat supply network heat exchanger 3 at the first station.
An operation method for long-distance heating by using air comprises the following steps:
the operation method comprises a circulation process of two working mediums, wherein the 1 st working medium circulation is a steam extraction circulation adopted in the steam extraction heat release circulation of various types of power generation turbines of a thermal power plant, a nuclear power plant and the like, is called the steam extraction heat release circulation of the turbine for short, and is a closed circulation; the 2 nd working medium cycle is a long-distance heat supply cycle taking air as a heat-carrying working medium, which is called an open cycle for short.
Aiming at the steam extraction heat release circulation of a steam turbine, the method comprises the following operation steps:
step 1: the steam turbine extraction passes through the extraction gate valve front extraction pipeline L1, flows through the extraction gate valve 7, and enters step 2.
Step 2: the steam flowing through the steam extraction gate valve 7 continuously flows through a rear steam extraction pipeline L2 of the steam extraction gate valve, enters the heat supply network first-station heat exchanger 3, and releases heat to air in the heat supply network first-station heat exchanger 3. And (4) after heat is released in the heat exchanger 3 at the first station of the heat supply network, extracting steam to convert into condensed water, and entering the step 3.
And step 3: condensed water condensed after the heat is extracted from the heat supply network head station heat exchanger 3 and released flows through the heat supply network head station heat exchanger to a condenser pipeline L3 and enters a condenser 4. The condensed water in the condenser 4 continuously participates in the thermodynamic cycle of the power plant.
Aiming at the air heating circulation, the following operation steps are provided:
step 1: air enters an air filter 6 for filtering by means of suction force at the inlet of the compressor 2, and then enters the step 2.
Step 2: the air filtered in the air filter 6 enters the compressor 2 through a compressor inlet pipe a1 to be compressed, and then enters the step 3.
And step 3: the air compressed in the compressor 2 flows through a compressor outlet pipeline A2, enters the heat network head station heat exchanger 3 to absorb extracted steam and release heat, absorbs the air with heat, is converted into hot air, and enters the step 4.
And 4, step 4: the air having absorbed heat in the heat supply network primary heat exchanger 3, that is, the hot air, flows through the air long-distance transport pipe a3, is transported for a long distance by the pressure of the air raised in the air compressor 2, and the hot air after the long-distance transport enters step 5.
And 5: the hot air after long-distance transmission enters the heat supply network user side heat exchanger 5 to release heat to the heat user, the hot air after heat release is converted into cold air, and the cold air is discharged into the atmosphere again through the heat supply network user side heat exchanger to the air exhaust pipeline A4.
In the technical scheme, air is used as a heat-carrying working medium, the system is simple, the work is reliable, the air after heat release is discharged into the atmosphere again, greenhouse gases are not generated, and the air content in the atmosphere is not reduced; in addition, the air can release heat for a hot user with large fall by utilizing the self pressure and the good diffusivity of the gas, and the invention fully embodies the characteristics of conciseness, practicability, convenience and economy.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A system for long-distance heat supply by using air is characterized by comprising a motor (1), a compressor (2), a heat supply network initial heat exchanger (3), a condenser (4), a heat supply network user side heat exchanger (5) and an air filter (6);
the motor (1) is connected with the compressor (2) through a shaft (S1), the outlet of the compressor (2) is connected with the air inlet of the heat supply network first station heat exchanger (3) through a compressor outlet pipeline (A2), the air outlet of the heat supply network first station heat exchanger (3) is connected with the inlet of the heat supply network user side heat exchanger (5), and the outlet of the heat supply network user side heat exchanger (5) is connected with the air exhaust pipeline (A4) of the heat supply network user side heat exchanger;
the steam inlet of the heat supply network first station heat exchanger (3) is connected with a front steam extraction pipeline (L1) of a steam extraction gate valve, and the steam outlet of the heat supply network first station heat exchanger (3) is connected with the inlet of a condenser (4) through a steam side heat supply network first station heat exchanger to a condenser pipeline (L3).
2. A system for long distance heating by using air according to claim 1, further comprising an air filter (6), wherein the outlet of the air filter (6) is connected with the inlet of the compressor (2) through a compressor inlet pipe (a 1).
3. A system for long distance heating by using air according to claim 2, characterized in that the extraction steam gate valve (7) is arranged on the extraction steam pipe (L1) in front of the extraction steam gate valve for controlling the extraction steam flow into the heat network head heat exchanger (3).
4. A system for long distance heating using air according to claim 2, wherein the motor (1) connected to the compressor (2) through the shaft (S1) can be replaced with a small turbine.
5. A system for long distance heating using air as claimed in claim 2, wherein the system comprises a closed cycle of a turbine extraction heat release cycle and an open cycle of an air heating cycle.
6. A system for long distance heating by using air according to claim 2, characterized in that the temperature of the air after absorbing heat from the heat supply network heat exchanger (3) at the head end can be adjusted according to the actual heat exchange load of the heat exchanger at the user side of the heat supply network.
7. A system for long distance heating using air according to claim 2, wherein the air filter (6) is used for filtering impurities in the air and is periodically cleaned to avoid clogging of the air filter (6).
8. An operation method for long-distance heat supply by using air is characterized in that the method is based on a system for long-distance heat supply by using air according to claim 3, and comprises a circulation process of two working media, wherein the 1 st working medium circulation is a steam extraction circulation adopted in the steam extraction heat release circulation of various types of turbines for power generation in a thermal power plant or a nuclear power plant, is called the steam extraction heat release circulation of the turbine for short, and is a closed circulation; the 2 nd working medium circulation is long-distance heat supply circulation taking air as a heat-carrying working medium, is called air heat supply circulation for short, and is an open circulation;
aiming at the steam extraction heat release circulation of a steam turbine, the method comprises the following operation steps:
step 1: the steam extracted by the steam turbine passes through a front steam extraction pipeline (L1) of the steam extraction gate valve, flows through the steam extraction gate valve (7) and enters the step 2;
step 2: the steam flowing through the steam extraction gate valve (7) continuously flows through a rear steam extraction pipeline (L2) of the steam extraction gate valve, enters the heat supply network first station heat exchanger (3), releases heat to air in the heat supply network first station heat exchanger (3), and is converted into condensed water after releasing heat in the heat supply network first station heat exchanger (3), and the step 3 is carried out;
and step 3: condensed water condensed after steam extraction and heat release in the heat supply network first-station heat exchanger (3) flows through the heat supply network first-station heat exchanger to a condenser pipeline (L3) and enters a condenser (4), and the condensed water in the condenser (4) continuously participates in thermodynamic cycle of a power plant;
aiming at the air heating circulation, the following operation steps are provided:
step 1: air enters an air filter (6) for filtering by means of suction force at an inlet of the air compressor (2), and then enters the step 2;
step 2: air filtered in the air filter (6) enters the compressor (2) through a compressor inlet pipeline (A1) to be compressed, and then enters the step 3;
and step 3: the air compressed in the compressor (2) flows through a compressor outlet pipeline (A2) and enters a heat supply network first-station heat exchanger (3) to absorb extracted steam and release heat, the air absorbing heat is converted into hot air, and the step 4 is carried out;
and 4, step 4: the air absorbing heat in the heat supply network first-station heat exchanger (3), namely the hot air, flows through an air long-distance transmission pipeline (A3), long-distance transmission is carried out by means of the pressure of the air lifted in the air compressor (2), and the hot air after long-distance transmission enters the step 5;
and 5: the hot air after long-distance transmission enters a heat exchanger (5) at the user side of the heat supply network to release heat to the heat user, the hot air after heat release is converted into cold air, and the cold air is exhausted into the atmosphere again through an air exhaust pipeline (A4) of the heat exchanger at the user side of the heat supply network.
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| CN202210211545.1A CN114543149A (en) | 2022-02-28 | 2022-02-28 | System for long-distance heat supply by using air and operation method |
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2022
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| CN1219669A (en) * | 1998-11-11 | 1999-06-16 | 康林 | Heat supply method and system with air as heat transmission carrier |
| JP2008157519A (en) * | 2006-12-22 | 2008-07-10 | Matsushita Electric Ind Co Ltd | Radiation heating/cooling system |
| US20140251309A1 (en) * | 2013-03-11 | 2014-09-11 | Kuebler Gmbh | Method and configuration for heating buildings with an infrared heater |
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