CN114659155A - Large-temperature-difference, long-distance and large-height-difference centralized heating system - Google Patents
Large-temperature-difference, long-distance and large-height-difference centralized heating system Download PDFInfo
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- CN114659155A CN114659155A CN202210437945.4A CN202210437945A CN114659155A CN 114659155 A CN114659155 A CN 114659155A CN 202210437945 A CN202210437945 A CN 202210437945A CN 114659155 A CN114659155 A CN 114659155A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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Abstract
The invention discloses a large-temperature-difference, long-distance and large-height-difference centralized heating system, which comprises a steam turbine unit, a relay steam mixing station, a first-stage energy station, a second-stage energy station, a third-stage comprehensive energy station, a fourth-stage energy station and a heat user, wherein the steam turbine unit is connected with the relay steam mixing station through a pipeline; a high-parameter steam long-distance pipe network, a low-parameter steam long-distance pipe network and a steam condensate pipeline are arranged between the steam turbine unit and the relay steam mixing station; a high-parameter steam long-distance pipeline network, a high-low pressure parameter steam mixed long-distance pipeline network and a steam condensate pipeline are arranged between the relay steam mixing station and the first-stage energy station; an ultra-high temperature hot water pipe network and an ultra-low temperature hot water pipe network are arranged between the first stage energy station and the second stage energy station; a 0-level network water supply pipeline and a 0-level network water return pipeline are arranged between the second-level energy station and the third-level comprehensive energy station; and an I-level network water supply pipeline and an I-level network water return pipeline are arranged between the third-level comprehensive energy station and the fourth-level comprehensive energy station. The invention realizes the long-distance steam/hot water delivery.
Description
Technical Field
The invention belongs to the technical field of heating engineering, and particularly relates to a large-temperature-difference, long-distance and large-height-difference centralized heating system.
Background
With the development of heat supply technology and the implementation of the national 3060 double-carbon plan, national energy faces a new round of resource integration, regional coal-fired boiler rooms and coal-fired power plants with high energy consumption are shut down, cross-regional conveying is realized by using large thermal power plants, the effect of fully utilizing cogeneration waste heat is realized, the heat is conveyed to a heat load region through a long-distance heat supply pipe network, the heat supply problem of urban residents and the steam utilization problem of industrial enterprises are solved, and the simultaneous steam and water conveying is realized. In recent years, the development of central heating in China is rapid, the heating capacity and the scale of a heating network are greatly improved, and the application range of the central heating is wider and wider. But the central heating is in the process of rapid development, the energy consumption of the heat supply heat source is high, and the main reasons are that the heat supply heat source is miniaturized, the conveying efficiency of the heat supply pipe network system is not high, the conveying energy consumption is high, the heat of a heat user is uneven, and the heat waste is serious; heat source efficiency is generally low; the enclosure structure has poor heat insulation. Moreover, in traditional central heating system, with the first station construction of heat supply network heat supply in the power plant, in order to overcome big difference in height, conventional heating system adopts multistage pump series technology to realize, and multistage pump series connection pipe network carries the energy consumption great, if with the advantage make full use of steam residual pressure and no water hammer risk, be equivalent to under the condition that does not increase the steam turbine and take out steam, has increased the heat supply capacity of heat source, reduces the pipe network and carries the energy consumption, so do not can fully effectual utilization at present.
Disclosure of Invention
The invention provides a large-temperature-difference, long-distance and large-height-difference centralized heating system, which aims to solve the problems of low measurement precision, large measurement span and low reliability of a flowmeter of a small flow in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large-temperature-difference, long-distance and large-height-difference centralized heating system,
the system comprises a steam turbine unit 1, a relay steam mixing station 2, a first-stage energy station 3, a second-stage energy station 4, a third-stage comprehensive energy station 5, a fourth-stage energy station 6 and a heat consumer 7 which are arranged in sequence;
a high-parameter steam long-distance transmission pipe network I101, a low-parameter steam long-distance transmission pipe network 102 and a steam condensate pipeline I103 are arranged between the steam turbine unit 1 and the relay steam mixing station 2;
a high-parameter steam long-distance transmission pipe network II201, a high-low pressure parameter steam mixed long-distance transmission pipe network 202 and a steam condensate pipeline II203 are arranged between the relay steam mixing station 2 and the first-stage energy station 3;
an ultra-high temperature hot water pipe network 301 and an ultra-low temperature hot water pipe network 302 are arranged between the first-stage energy station 3 and the second-stage energy station 4;
a 0-level network water supply pipeline 401 and a 0-level network water return pipeline 402 are arranged between the second-level energy station 4 and the third-level comprehensive energy station 5;
a grade I net water supply pipeline 501 and a grade I net water return pipeline 502 are arranged between the third-stage comprehensive energy station 5 and the fourth-stage comprehensive energy station 6;
a II-level network water supply pipeline 601 and a II-level network water return pipeline 602 are arranged between the fourth-level energy station 6 and the heat consumer 7.
Further, the relay steam mixing station 2 is arranged at a position 125km away from the steam turbine unit; the relay steam mixing station 2 comprises a pressure matcher 204, a pressure reducing valve 205, a condensed water pressurizing pump I206 and a pressure regulating tower 207, wherein a high-parameter steam long-distance transmission pipe network I101 is divided into two paths, one path of the high-parameter steam long-distance transmission pipe network I101 is connected with a high-parameter steam long-distance transmission pipe network II201, the other path of the high-parameter steam long-distance transmission pipe network I101 and a low-parameter steam long-distance transmission pipe network 102 are respectively connected with the inlet of the pressure matcher 204, the outlet of the pressure matcher 204 is connected with a high-low pressure parameter steam mixed long-distance transmission pipe network 202, part of high-pressure steam of the high-parameter steam long-distance transmission pipe network I101 and low-pressure steam in the low-parameter steam long-distance transmission pipe network 102 are mixed through the pressure matcher 204 to increase low-pressure steam parameters, the high-low-pressure parameter steam is mixed and then continuously transmitted through the long-distance transmission pipe network 202, and low-grade steam in the steam turbine unit 1 is further utilized; the steam condensate pipe II203 is connected with an inlet of the pressure regulating tower 207, is positioned on the steam condensate pipe II203, is sequentially provided with a pressure reducing valve 205 and a condensate water pressure pump I206 in the inflow direction of the pressure regulating tower 207, and an outlet of the pressure regulating tower 207 is connected with the steam condensate pipe I103.
Further, the first stage energy station 3 is arranged at a position 150km away from the steam turbine unit, and the first stage energy station 3 comprises an asynchronous generator 303, a pneumatic circulating pump 304, a peak heater 305, a basic heater 306 and a condensed water pressurizing pump II 307; the high-parameter long steam transmission pipe network II201 is connected with an inlet of a peak heater 305, the high-low pressure parameter steam mixed long transmission pipe network 202 and the ultralow temperature hot water pipe network 302 are respectively connected with an inlet of a basic heater 306, the high-parameter long steam transmission pipe network II201 and the high-low pressure parameter steam mixed long transmission pipe network 202 are respectively communicated through an asynchronous generator 303 and a steam-driven circulating pump 304, the ultrahigh temperature hot water pipe network 301 is connected with an outlet of the peak heater 305, two steam condensate water pipes II203 respectively flow out from outlets of the peak heater 305 and the basic heater 306 and then are converged on the same steam condensate water pipe II203, a condensate water pressure pump II307 is arranged on the steam condensate water pipe II203, and the peak heater 305 and the basic heater 306 are communicated through the ultralow temperature hot water pipe network 302. The combined supply of heat, electricity and steam can be realized in the first-stage energy station 3, a steam-water heat exchange device is arranged through the peak heater 305 and the basic heater 306 to realize heat exchange, and partial steam condensate water is used as the constant-pressure water supplement of the first heat supply station; the power plant is automatically used by setting an asynchronous generator 303 to generate electricity; the kinetic energy of the circulating water circulation can be increased by the steam-operated circulating pump 304.
Further, the second-stage energy station 4 is arranged at a position 175km away from the steam turbine unit, the second-stage energy station 4 comprises a condensate pressure pump III403 and a tube plate combined heat exchanger 404, the ultra-high temperature hot water pipe network 301 is connected with an inlet of the tube plate combined heat exchanger 404, an outlet of the tube plate combined heat exchanger 404 is connected with a 0-stage network water supply pipeline 401, 180 ℃ high temperature hot water in the 0-stage network water supply pipeline 401 can be used for producing steam for industrial steam supply load through the tube plate combined heat exchanger 404, the 0-stage network water return pipeline 402 is connected with an inlet of the condensate pressure pump III403, and an outlet of the condensate pressure pump III403 is connected with the ultra-low temperature hot water pipe network 302.
Further, the third stage energy station 5 is arranged at a position 1100km away from the steam turbine unit, and the third stage energy station 5 comprises a generator 503, a heat exchanger 504, an evaporator 505, an absorber 506, a condenser 507 and a condensed water pressurizing pump IV 508; the 180 ℃ hot water in the 0-level network water supply pipeline 401 sequentially passes through the generator 503, the heat exchanger 504 and the evaporator 505 to release heat, and the cooled 30 ℃ hot water flows out through the 0-level network water return pipeline 402; circulating water at 20 ℃ in the I-level network water return pipeline 502 is pressurized by a condensate water pressurizing pump IV508, then sequentially passes through an absorber 506 and a condenser 507, is heated to 170 ℃, and then flows out through an I-level network water supply pipeline 501, and the I-level network water return pipeline 502, the heat exchanger 504 and the I-level network water supply pipeline 501 are sequentially communicated.
Further, the fourth-stage energy station 6 is a cell heat exchange station, and the structure of the fourth-stage energy station 6 is the same as that of the third-stage energy station 5. The fourth stage energy station 6 comprises a generator VI603, a heat exchanger VI604, an evaporator VI605, an absorber VI606, a condenser VI607 and a condensate booster pump VI 608; hot water in the I-level network water supply pipeline 501 passes through the generator VI603, the heat exchanger VI604 and the evaporator VI605 in sequence to release heat, and cooled hot water flows out through the II-level network water return pipeline 602; circulating water in the II-level net water return pipeline 602 is pressurized by a condensed water pressurizing pump VI608, then sequentially passes through an absorber VI606 and a condenser VI607 for temperature rise, and then flows out through a II-level net water supply pipeline 601, and the II-level net water return pipeline 602, the heat exchanger VI604 and the II-level net water supply pipeline 601 are sequentially communicated.
Further, the steam pressure conveyed by the high-parameter steam long-distance transmission pipe network I101 is more than or equal to 0.6MPa, and the steam conveyed by the low-parameter steam long-distance transmission pipe network 102 is 0.2-0.6 MPa;
the temperature in the ultra-high temperature hot water pipe network 301 is 180 ℃, and the temperature in the ultra-low temperature hot water pipe network 302 is 30 ℃;
the temperature in the 0-level network water supply pipeline 401 is 180 ℃, and the temperature in the 0-level network water return pipeline 402 is 30 ℃;
the temperature in the I-grade network water supply pipeline 501 is 170 ℃, and the temperature in the I-grade network water return pipeline 502 is 20 ℃;
the temperature in the water supply pipeline 601 of the II-level network is 75 ℃, and the temperature in the water return pipeline 602 of the II-level network is 50 ℃.
Further, the high-parameter long-distance steam transmission pipe network I101, the low-parameter long-distance steam transmission pipe network 102, the high-parameter long-distance steam transmission pipe network II201 and the long-distance steam transmission pipe network 202 after high-low pressure parameter steam mixing are all prefabricated pipes, each prefabricated pipe comprises an inner support pipe 1002, at least one composite heat insulation layer 1003, a soft heat insulation sleeve 1005, a polyurethane foam 1006 and an outer sheath pipe 1007, the inner support pipe 1002 wraps the working steel pipe 1001 from inside to outside, a plurality of wooden supports 1008 are uniformly arranged between the soft heat insulation sleeve 1005 and the outer sheath pipe 1008 along the circumferential direction, and an inner sliding pipe support 1004 is further arranged outside the working steel pipe 1001.
Further, ultra-high temperature hot-water pipe network 301, 0 level net water supply pipeline 401 and I level net water supply pipeline 501 structure are the same, all include from inside to outside wrap up heat preservation insulating layer and outer tube 3005 on interior working tube 3001, heat preservation insulating layer from inside to outside is stereoplasm multicavity hole ceramic heat preservation 3002, reflector 3003 and polyurethane stereoplasm foam heat preservation 3004 in proper order.
Further, the volume weight of the hard multi-cavity ceramic insulating layer 3002 is 170 +/-15 kg/m3The thickness of the outer sleeve 3005 is 2-16mm, the thickness of the reflecting layer 3003 is 7mm, the thickness of the polyurethane rigid foam heat-insulating layer 3004 is 30-65mm, and the outer sleeve 3005 is made of a polyethylene pipe.
Compared with the prior art, the invention has the following beneficial effects:
the invention can effectively utilize the energy in the steam residual pressure by conversion and utilization, improve the energy efficiency ratio of the system, relieve the problems of large energy consumption and water impact resistance in the serial transportation of the multistage pumps of the centralized heating system with ultra-large temperature difference, ultra-long distance and ultra-large height difference, and realize the ultra-long distance of 100km, long-distance transportation of steam of 50km and long-distance transportation of hot water of 50 km; the ultra-large temperature difference design water supply and return temperature is 180/30 ℃, the temperature difference reaches 150 ℃, the water supply temperature is increased, and the return temperature is reduced; large height difference, and the topographic height difference is 200-450 m.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a relay steam mixing station according to the present invention;
FIG. 3 is a schematic diagram of a first stage power station according to the present invention;
FIG. 4 is a schematic diagram of a third stage power station according to the present invention;
FIG. 5 is a schematic diagram of a fourth stage power station according to the present invention;
FIG. 6 is a schematic view of the construction of a prefabricated pipe according to the present invention;
fig. 7 is a schematic diagram of the hot water pipe network/supply pipeline of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a large-temperature-difference, long-distance and large-height-difference centralized heating system comprises a steam turbine unit 1, a relay steam mixing station 2, a first-stage energy station 3, a second-stage energy station 4, a third-stage comprehensive energy station 5, a fourth-stage energy station 6 and a heat consumer 7 which are sequentially arranged; a high-parameter steam long-distance transmission pipe network I101, a low-parameter steam long-distance transmission pipe network 102 and a steam condensate pipeline I103 are arranged between the steam turbine unit 1 and the relay steam mixing station 2; a high-parameter steam long-distance transmission pipe network II201, a high-low pressure parameter steam mixed long-distance transmission pipe network 202 and a steam condensate pipeline II203 are arranged between the relay steam mixing station 2 and the first-stage energy station 3; an ultra-high temperature hot water pipe network 301 and an ultra-low temperature hot water pipe network 302 are arranged between the first-stage energy station 3 and the second-stage energy station 4; a 0-level network water supply pipeline 401 and a 0-level network water return pipeline 402 are arranged between the second-level energy station 4 and the third-level comprehensive energy station 5; a grade I net water supply pipeline 501 and a grade I net water return pipeline 502 are arranged between the third-stage comprehensive energy station 5 and the fourth-stage comprehensive energy station 6; a II-level network water supply pipeline 601 and a II-level network water return pipeline 602 are arranged between the fourth-level energy station 6 and the heat consumer 7.
As a preferable scheme, the steam pressure conveyed by the high-parameter steam long-distance transmission pipe network I101 is more than or equal to 0.6MPa, and the steam conveyed by the low-parameter steam long-distance transmission pipe network 102 is 0.2-0.6 MPa; the temperature in the ultra-high temperature hot water pipe network 301 is 180 ℃, and the temperature in the ultra-low temperature hot water pipe network 302 is 30 ℃; the temperature in the 0-level network water supply pipeline 401 is 180 ℃, and the temperature in the 0-level network water return pipeline 402 is 30 ℃; the temperature in the I-grade network water supply pipeline 501 is 170 ℃, and the temperature in the I-grade network water return pipeline 502 is 20 ℃; the temperature in the water supply pipeline 601 of the II-level network is 75 ℃, and the temperature in the water return pipeline 602 of the II-level network is 50 ℃.
As shown in fig. 2, the intermediate steam mixing station 2 is arranged at a position 125km away from the steam turbine unit; the relay steam mixing station 2 comprises a pressure matcher 204, a pressure reducing valve 205, a condensed water pressurizing pump I206 and a pressure regulating tower 207, wherein a high-parameter steam long-distance transmission pipe network I101 is divided into two paths, one path of the high-parameter steam long-distance transmission pipe network I101 is connected with a high-parameter steam long-distance transmission pipe network II201, the other path of the high-parameter steam long-distance transmission pipe network I101 and a low-parameter steam long-distance transmission pipe network 102 are respectively connected with the inlet of the pressure matcher 204, the outlet of the pressure matcher 204 is connected with a high-low pressure parameter steam mixed long-distance transmission pipe network 202, part of high-pressure steam of the high-parameter steam long-distance transmission pipe network I101 and low-pressure steam in the low-parameter steam long-distance transmission pipe network 102 are mixed through the pressure matcher 204 to increase low-pressure steam parameters, the high-low-pressure parameter steam is mixed and then continuously transmitted through the long-distance transmission pipe network 202, and low-grade steam in the steam turbine unit 1 is further utilized; the steam condensate pipe II203 is connected with an inlet of the pressure regulating tower 207, is positioned on the steam condensate pipe II203, is sequentially provided with a pressure reducing valve 205 and a condensate water pressure pump I206 in the inflow direction of the pressure regulating tower 207, and an outlet of the pressure regulating tower 207 is connected with the steam condensate pipe I103.
As shown in fig. 3, the first stage energy station 3 is located at a distance of 150km from the steam turbine unit, and the first stage energy station 3 includes an asynchronous generator 303, a steam-driven circulation pump 304, a peak heater 305, a basic heater 306, and a condensate water pressurizing pump II 307; the high-parameter long steam transmission pipe network II201 is connected with an inlet of a peak heater 305, the high-low pressure parameter steam mixed long transmission pipe network 202 and the ultralow temperature hot water pipe network 302 are respectively connected with an inlet of a basic heater 306, the high-parameter long steam transmission pipe network II201 and the high-low pressure parameter steam mixed long transmission pipe network 202 are respectively communicated through an asynchronous generator 303 and a steam-driven circulating pump 304, the ultrahigh temperature hot water pipe network 301 is connected with an outlet of the peak heater 305, two steam condensate water pipes II203 respectively flow out from outlets of the peak heater 305 and the basic heater 306 and then are converged on the same steam condensate water pipe II203, a condensate water pressure pump II307 is arranged on the steam condensate water pipe II203, and the peak heater 305 and the basic heater 306 are communicated through the ultralow temperature hot water pipe network 302. The combined supply of heat, electricity and steam can be realized in the first-stage energy station 3, a steam-water heat exchange device is arranged through the peak heater 305 and the basic heater 306 to realize heat exchange, and partial steam condensate water is used as the constant-pressure water supplement of the first heat supply station; the power plant is automatically used by setting an asynchronous generator 303 to generate electricity; the kinetic energy of the circulating water circulation can be increased by the steam-operated circulating pump 304.
As shown in fig. 1, the second stage energy station 4 is located 175km away from the steam turbine plant, the second stage energy station 4 includes a condensate pressure pump III403 and a tube plate combined heat exchanger 404, the ultra-high temperature hot water pipe network 301 is connected to an inlet of the tube plate combined heat exchanger 404, an outlet of the tube plate combined heat exchanger 404 is connected to a 0-stage network water supply pipeline 401, steam can be produced by using high temperature hot water of 180 ℃ in the 0-stage network water supply pipeline 401 through the tube plate combined heat exchanger 404 for industrial steam supply load, the 0-stage network water return pipeline 402 is connected to an inlet of the condensate pressure pump III403, and an outlet of the condensate pressure pump III403 is connected to the ultra-low temperature hot water pipe network 302.
As shown in fig. 4, the third stage energy station 5 is provided at a position 1100km away from the steam turbine unit, and the third stage energy station 5 includes a generator 503, a heat exchanger 504, an evaporator 505, an absorber 506, a condenser 507, and a condensed water pressurizing pump IV 508; the 180 ℃ hot water in the 0-level network water supply pipeline 401 sequentially passes through the generator 503, the heat exchanger 504 and the evaporator 505 to release heat, and the cooled 30 ℃ hot water flows out through the 0-level network water return pipeline 402; circulating water at 20 ℃ in the I-level network water return pipeline 502 is pressurized by a condensed water pressurizing pump IV508, sequentially passes through an absorber 506 and a condenser 507, is heated to 170 ℃, and then flows out through an I-level network water supply pipeline 501, and the I-level network water return pipeline 502, the heat exchanger 504 and the I-level network water supply pipeline 501 are sequentially communicated.
As shown in fig. 5, the fourth stage energy station 6 is a cell heat exchange station, and the structure of the fourth stage energy station 6 is the same as that of the third stage energy station 5. The fourth stage energy station 6 comprises a generator VI603, a heat exchanger VI604, an evaporator VI605, an absorber VI606, a condenser VI607 and a condensate booster pump VI 608; hot water in the I-level network water supply pipeline 501 passes through the generator VI603, the heat exchanger VI604 and the evaporator VI605 in sequence to release heat, and cooled hot water flows out through the II-level network water return pipeline 602; circulating water in the II-level net water return pipeline 602 is pressurized by a condensed water pressurizing pump VI608, then sequentially passes through an absorber VI606 and a condenser VI607 for temperature rise, and then flows out through a II-level net water supply pipeline 601, and the II-level net water return pipeline 602, the heat exchanger VI604 and the II-level net water supply pipeline 601 are sequentially communicated.
As shown in fig. 6, the high-parameter long steam transmission pipe network I101, the low-parameter long steam transmission pipe network 102, the high-parameter long steam transmission pipe network II201, and the long steam transmission pipe network 202 after mixing high-low pressure parameter steam are all prefabricated pipes, each prefabricated pipe comprises an inner support pipe 1002, at least one composite insulating layer 1003, a soft insulating sleeve 1005, a polyurethane foam 1006, and an outer sheath pipe 1007, which are wrapped on a working steel pipe 1001 from inside to outside, a plurality of wooden supports 1008 are uniformly arranged between the soft insulating sleeve 1005 and the outer sheath pipe 1008 along the circumferential direction, and an inner sliding pipe support 1004 is further arranged outside the working steel pipe 1001. The positional connection between the inner slide pipe bracket 1004 and other components is in the prior art.
As shown in fig. 7, the ultra-high temperature hot water pipe network 301, the 0-level network water supply pipeline 401 and the I-level network water supply pipeline 501 have the same structure, and both include a thermal insulation layer and an outer sleeve 3005 wrapped on the inner working pipe 3001 from inside to outside, and the thermal insulation layer sequentially includes a hard multi-cavity ceramic thermal insulation layer 3002, a reflective layer 3003 and a polyurethane hard foam thermal insulation layer 3004 from inside to outside.
Preferably, the volume weight of the hard multi-cavity ceramic insulation layer 3002 is 170 +/-15 kg/m3The thickness of the outer sleeve 3005 is 2-16mm, the thickness of the reflecting layer 3003 is 7mm, the thickness of the polyurethane rigid foam heat-insulating layer 3004 is 30-65mm, and the outer sleeve 3005 is made of a polyethylene pipe.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A large-temperature-difference, long-distance and large-height-difference centralized heating system, which is characterized in that,
the system comprises a steam turbine unit (1), a relay steam mixing station (2), a first-stage energy station (3), a second-stage energy station (4), a third-stage comprehensive energy station (5), a fourth-stage energy station (6) and a heat consumer (7) which are arranged in sequence;
a high-parameter steam long-distance transmission pipe network I (101), a low-parameter steam long-distance transmission pipe network (102) and a steam condensate pipeline I (103) are arranged between the steam turbine unit (1) and the relay steam mixing station (2);
a high-parameter steam long-distance transmission pipe network II (201), a high-low pressure parameter steam mixed long-distance transmission pipe network (202) and a steam condensate pipeline II (203) are arranged between the relay steam mixing station (2) and the first-stage energy station (3);
an ultra-high temperature hot water pipe network (301) and an ultra-low temperature hot water pipe network (302) are arranged between the first-stage energy station (3) and the second-stage energy station (4);
a 0-level network water supply pipeline (401) and a 0-level network water return pipeline (402) are arranged between the second-level energy station (4) and the third-level comprehensive energy station (5);
an I-grade net water supply pipeline (501) and an I-grade net water return pipeline (502) are arranged between the third-stage comprehensive energy station (5) and the fourth-stage comprehensive energy station (6);
and a II-level network water supply pipeline (601) and a II-level network water return pipeline (602) are arranged between the fourth-level energy station (6) and the heat consumer (7).
2. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the relay steam mixing station (2) is arranged at a position 25km away from the steam turbine unit (1); the relay steam mixing station (2) comprises a pressure matcher (204), a pressure reducing valve (205), a condensed water pressurizing pump I (206) and a pressure regulating tower (207), wherein the high-parameter steam long-distance transmission pipe network I (101) is divided into two paths, one path of high-parameter steam long-distance transmission pipe network I (101) is connected with a high-parameter steam long-distance transmission pipe network II (201), the other path of high-parameter steam long-distance transmission pipe network I (101) and the low-parameter steam long-distance transmission pipe network (102) are respectively connected with an inlet of the pressure matcher (204), and an outlet of the pressure matcher (204) is connected with a high-low pressure parameter steam mixed long-distance transmission pipe network (202); the entry of surge tower (207) is connected in steam condensate pipe II (203), and is located steam condensate pipe II (203), has set gradually relief pressure valve (205) and condensate booster pump I (206) on the inflow direction of surge tower (207), the exit linkage steam condensate pipe I (103) of surge tower (207).
3. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the first-stage energy station (3) is arranged at a position 50km away from the steam turbine unit (1), and the first-stage energy station (3) comprises an asynchronous generator (303), a pneumatic circulating pump (304), a peak heater (305), a basic heater (306) and a condensed water pressure pump II (307); the high-parameter steam long-distance pipeline network II (201) is connected with the inlet of the spike heater (305), the long-distance transmission pipe network (202) and the ultra-low temperature hot water pipe network (302) after the high-pressure and low-pressure parameter steam is mixed are respectively connected with the inlet of the basic heater (306), the high-parameter steam long-distance transmission pipe network II (201) is communicated with the high-low pressure parameter steam mixed long-distance transmission pipe network (202) through an asynchronous generator (303) and a pneumatic circulating pump (304) respectively, the ultrahigh-temperature hot water pipe network (301) is connected with the outlet of the peak heater (305), the two steam condensate pipes II (203) respectively flow out from the outlets of the peak heater (305) and the basic heater (306) and then are converged on the same steam condensate pipe II (203), and a condensed water pressure pump II (307) is arranged on the steam condensed water pipeline II (203), the peak heater (305) is communicated with the basic heater (306) through an ultra-low temperature hot water pipe network (302).
4. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the utility model discloses a condensation water turbine system, including first grade energy station (4), second grade energy station (4) are established at the position apart from steam turbine unit (1) 75km, second grade energy station (4) are including condensate water force (forcing) pump III (403) and tube sheet combination heat exchanger (404), the entry that tube sheet combination heat exchanger (404) is connected in ultra-high temperature hot water pipe network (301), and 0 level net water supply pipe (401) are connected in the exit linkage of tube sheet combination heat exchanger (404), the entry of condensate water force (forcing) pump III (403) is connected in 0 level net return water pipeline (402), and the exit linkage ultra-low temperature hot water pipe network (302) of condensate water force (forcing) pump III (403).
5. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the third-stage energy station (5) is arranged at a position 100km away from the steam turbine unit (1), and the third-stage energy station (5) comprises a generator (503), a heat exchanger (504), an evaporator (505), an absorber (506), a condenser (507) and a condensed water pressurizing pump IV (508); 180 ℃ hot water in the 0-level network water supply pipeline (401) sequentially passes through the generator (503), the heat exchanger (504) and the evaporator (505) to release heat, and the cooled 30 ℃ hot water flows out through the 0-level network water return pipeline (402); circulating water at 20 ℃ in the I-level network water return pipeline (502) is pressurized by a condensate water pressurizing pump IV (508), then sequentially passes through an absorber (506) and a condenser (507), is heated to 170 ℃, and then flows out through the I-level network water supply pipeline (501), and the I-level network water return pipeline (502), the heat exchanger (504) and the I-level network water supply pipeline (501) are sequentially communicated.
6. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the fourth energy station (6) is a district heat exchange station, and the fourth energy station (6) comprises a generator VI (603), a heat exchanger VI (604), an evaporator VI (605), an absorber VI (606), a condenser VI (607) and a condensed water booster pump VI (608); hot water in the I-level network water supply pipeline (501) sequentially passes through the generator VI (603), the heat exchanger VI (604) and the evaporator VI (605) to release heat, and the cooled hot water flows out through the II-level network water return pipeline (602); circulating water in the II-level net water return pipeline (602) is pressurized by a condensed water pressurizing pump VI (608), sequentially passes through an absorber VI (606) and a condenser VI (607) for heating, and then flows out through a II-level net water supply pipeline (601), and the II-level net water return pipeline (602), a heat exchanger VI (604) and the II-level net water supply pipeline (601) are sequentially communicated.
7. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the steam pressure conveyed by the high-parameter steam long-distance transmission pipe network I (101) is more than or equal to 0.6MPa, and the steam conveyed by the low-parameter steam long-distance transmission pipe network (102) is 0.2-0.6 MPa;
the temperature in the ultra-high temperature hot water pipe network (301) is 180 ℃, and the temperature in the ultra-low temperature hot water pipe network (302) is 30 ℃;
the temperature in the water supply pipeline (401) of the 0-level network is 180 ℃, and the temperature in the water return pipeline (402) of the 0-level network is 30 ℃;
the temperature in the I-level network water supply pipeline (501) is 170 ℃, and the temperature in the I-level network water return pipeline (502) is 20 ℃;
the temperature in the water supply pipeline (601) of the II-level network is 75 ℃, and the temperature in the water return pipeline (602) of the II-level network is 50 ℃.
8. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
the long-distance transmission pipe network (202) is a prefabricated pipe after the high-parameter steam long-distance transmission pipe network I (101), the low-parameter steam long-distance transmission pipe network (102), the high-parameter steam long-distance transmission pipe network II (201) and high-low pressure parameter steam are mixed, the prefabricated pipe comprises an inner supporting pipe (1002), at least one layer of composite heat insulation layer (1003), a soft heat insulation sleeve (1005), a polyurethane foam body (1006) and an outer protective sleeve (1007) which are wrapped on a working steel pipe (1001) from inside to outside, a plurality of wooden supports (1008) are uniformly arranged between the soft heat insulation sleeve (1005) and the outer protective sleeve (1008) along the circumferential direction, and an inner sliding pipe support (1004) is further arranged outside the working steel pipe (1001).
9. The large-temperature-difference, long-distance, large-height-difference centralized heating system according to claim 1,
ultra-high temperature hot-water pipe network (301), 0 level net water supply pipeline (401) and I level net water supply pipeline (501) structure are the same, all include from interior to wrap up heat preservation insulating layer and outer tube (3005) on interior working tube (3001) outward, heat preservation insulating layer from interior to exterior is stereoplasm multiorifice ceramic heat preservation (3002), reflector (3003) and polyurethane stereoplasm foam heat preservation (3004) in proper order.
10. The large-temperature-difference, remote-difference, large-height-difference centralized heating system according to claim 9,
the volume weight of the hard multi-cavity hole ceramic heat-insulating layer (3002) is 170 +/-15 kg/m3The thickness of the heat-insulating polyurethane tube is 10mm, the thickness of the reflecting layer (3003) is 7mm, the thickness of the rigid polyurethane foam heat-insulating layer (3004) is 30-65mm, the outer sleeve (3005) is made of a polyethylene tube, and the thickness of the outer sleeve is 2-16 mm.
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| CN115095844A (en) * | 2022-06-28 | 2022-09-23 | 南京苏夏设计集团股份有限公司 | Long heat transmission network system based on nuclear power field |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115095844A (en) * | 2022-06-28 | 2022-09-23 | 南京苏夏设计集团股份有限公司 | Long heat transmission network system based on nuclear power field |
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