CN114659155A - Large-temperature-difference, long-distance and large-height-difference centralized heating system - Google Patents

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

A large temperature difference, long distance, large height difference central heating system

technical field

The invention belongs to the technical field of heating engineering, and in particular relates to a large temperature difference, long distance and large height difference central heating system.

Background technique

With the development of heating technology and the implementation of the national 3060 dual-carbon plan, the national energy is facing a new round of resource integration, shutting down regional coal-fired boiler rooms and high-energy-consuming coal-fired power plants, and using large thermal power plants to achieve cross-regional transmission. Make full use of the role of cogeneration waste heat, and transport it to the heat load area through a long-distance heating pipe network to solve the heating problem of urban residents and the problem of steam consumption by industrial enterprises, and realize the simultaneous transmission of steam and water. In recent years, my country's central heating has developed rapidly, both the heating capacity and the scale of the heating network have been greatly improved, and the application scope of central heating has become wider and wider. However, in the process of rapid development of central heating, the energy consumption of heating sources remains high. The main reasons are: the miniaturization of heating sources, the low transmission efficiency of the heating pipe network system, the high transmission energy consumption, and the inefficient heat consumption of heat users. The heat source efficiency is generally low, and the envelope structure is poorly insulated. Moreover, in the traditional central heating system, the first heating station of the heating network is built in the power plant. In order to overcome the large height difference, the conventional heating system adopts the multi-stage pump series technology to realize, and the multi-stage pump series pipe network transports energy. If the advantages of steam residual pressure and no water hammer risk are fully utilized, it is equivalent to increasing the heating capacity of the heat source and reducing the energy consumption of the pipeline network without increasing the steam extraction of the steam turbine. Make full and effective use.

SUMMARY OF THE INVENTION

The invention provides a large temperature difference, long distance, large height difference central heating system to solve the problems of low measurement accuracy, large measurement span and low reliability of flowmeter in the prior art.

In order to achieve the above object, the present invention adopts the following technical solutions:

A large temperature difference, long distance, large height difference central heating system,

It includes a steam turbine unit 1, a relay steam mixing station 2, a first-level energy station 3, a second-level energy station 4, a third-level comprehensive energy station 5, a fourth-level energy station 6 and a heat user 7, which are arranged in sequence;

A high-parameter long-distance steam transmission pipeline network I101, a low-parameter long-distance steam transmission pipeline network 102 and a steam condensate water pipeline I103 are arranged between the steam turbine unit 1 and the relay steam mixing station 2;

Between the relay steam mixing station 2 and the first-level energy station 3, a long-distance steam transmission pipeline network II201 with high parameters, a long-distance transmission pipeline network 202 after high-low pressure parameter steam mixing, and a steam condensate water pipeline II203 are arranged;

An ultra-high temperature hot water pipe network 301 and an ultra-low temperature hot water pipe network 302 are arranged between the first-level energy station 3 and the second-level energy station 4;

Between the second-level energy station 4 and the third-level comprehensive energy station 5, a 0-level network water supply pipeline 401 and a 0-level network return water pipeline 402 are arranged;

Between the third-level comprehensive energy station 5 and the fourth-level energy station 6, there are I-level network water supply pipelines 501 and I-level network return water pipelines 502;

A level II network water supply pipeline 601 and a level II network return water pipeline 602 are arranged between the fourth-level energy station 6 and the heat user 7 .

Further, the relay steam mixing station 2 is located at a distance of 125km from the steam turbine unit; the relay steam mixing station 2 includes a pressure matcher 204, a pressure reducing valve 205, a condensate booster pump I206 and a pressure regulating tower 207 The high-parameter long-distance steam transmission pipeline network I101 is divided into two circuits, one high-parameter long-distance steam transmission pipeline network I101 is connected to the high-parameter long-distance steam transmission pipeline network II201, and the other high-parameter long-distance steam transmission pipeline network I101 and the low-parameter steam long-distance pipeline network I101 The pipeline network 102 is respectively connected to the inlet of the pressure matcher 204, and the outlet of the pressure matcher 204 is connected to the long-distance pipeline network 202 after the high and low-pressure parameter steam is mixed. A part of the high-pressure steam and the low-parameter steam of the high-parameter steam long-distance pipeline network I101 The low-pressure steam in the long-distance pipeline network 102 is mixed by the pressure matcher 204 to improve the low-pressure steam parameters, and the long-distance pipeline network 202 continues to be transported after the high-low pressure parameter steam is mixed, and the low-grade steam in the steam turbine unit 1 is further utilized; the steam condensate water The pipeline II203 is connected to the inlet of the pressure regulating tower 207, and is located on the steam condensed water pipeline II203, and a pressure reducing valve 205 and a condensed water booster pump I206 are sequentially arranged in the inflow direction of the pressure regulating tower 207. The outlet is connected to the steam condensate pipe I103.

Further, 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 circulating pump 304, a peak heater 305, a basic heater 306 and Condensate pressure pump II307; the high-parameter steam long-distance pipeline network II201 is connected to the inlet of the peak heater 305, and the long-distance pipeline network 202 and the ultra-low temperature hot water pipeline network 302 are respectively connected to the basic heater after the high-low pressure parameter steam is mixed At the entrance of 306, the long-distance pipeline network II201 of the high-parameter steam and the long-distance pipeline network 202 after the high-low pressure parameter steam are mixed are connected through the asynchronous generator 303 and the steam-driven circulating pump 304 respectively, and the ultra-high temperature hot water pipe The net 301 is connected to the outlet of the peak heater 305, and the two steam condensate pipes II203 flow out from the outlets of the peak heater 305 and the basic heater 306 respectively and then converge on the same steam condensate pipe II203, and the steam condensate pipe II203 A condensed water pressurizing pump II307 is provided on the top, and the peak heater 305 and the basic heater 306 are communicated through an ultra-low temperature hot water pipe network 302 . The triple supply of heat, electricity and steam can be realized in the first-level energy station 3. The heat exchange is realized by setting up a steam-water heat exchange device through the peak heater 305 and the basic heater 306, and part of the steam condensed water is used as the constant pressure make-up water for the first heat supply station. ; By setting the asynchronous generator 303 to generate electricity to achieve self-consumption of electricity in the plant area; through the steam-driven circulating pump 304, the kinetic energy of the circulating water can be improved.

Further, the second-stage energy station 4 is located at a distance of 175km from the steam turbine unit. The second-stage energy station 4 includes a condensate water booster pump III403 and a tube-sheet combined heat exchanger 404. The ultra-high temperature hot water The pipe network 301 is connected to the inlet of the tube sheet combined heat exchanger 404, and the outlet of the tube sheet combined heat exchanger 404 is connected to the 0-level network water supply pipeline 401. Through the tube plate combined with the heat exchanger 404, the 180° C. in the 0-level network water supply pipeline 401 can be used. The high-temperature hot water produces steam for industrial steam supply load. The 0-level network return water pipeline 402 is connected to the inlet of the condensate water booster pump III403, and the outlet of the condensate water booster pump III403 is connected to the ultra-low temperature hot water pipe network 302.

Further, the third-level energy station 5 is located at a distance of 1100km from the steam turbine unit, and the third-level energy station 5 includes a generator 503, a heat exchanger 504, an evaporator 505, an absorber 506, a condenser 507 and Condensate pressure pump IV508; the 180°C hot water in the water supply pipeline 401 of the 0-level network passes through the generator 503, the heat exchanger 504 and the evaporator 505 to release heat in sequence, and the 30°C hot water after cooling returns to the water through the 0-level network The pipeline 402 flows out; the circulating water at 20°C in the I-level network return water pipeline 502 is pressurized by the condensate water pressurizing pump IV508, and then the temperature is raised to 170°C through the absorber 506 and the condenser 507 in turn, and then the water is supplied through the I-level network. The pipeline 501 flows out, and the I-level network return pipeline 502, the heat exchanger 504 and the I-level network water supply pipeline 501 are sequentially connected.

Further, the fourth-level energy station 6 is a residential heat exchange station, and the structure of the fourth-level energy station 6 is the same as that of the third-level energy station 5 . The fourth-level energy station 6 includes a generator VI603, a heat exchanger VI604, an evaporator VI605, an absorber VI606, a condenser VI607 and a condensate pressure pump VI608; the hot water in the first-level network water supply pipeline 501 passes through in turn The generator VI603, the heat exchanger VI604 and the evaporator VI605 release heat, and the cooled hot water flows out through the II-level network return pipe 602; the circulating water in the II-level network return pipe 602 passes through the condensate water pressure pump VI608 After pressurization, the temperature is increased through the absorber VI606 and the condenser VI607 in sequence, and then flows out through the II-level network water supply pipeline 601. The II-level network return water pipeline 602, the heat exchanger VI604 and the II-level network water supply pipeline 601 are sequentially connected.

Further, the steam pressure conveyed by the high-parameter long-distance steam pipeline network I101 is greater than or equal to 0.6MPa, and the steam conveyed by the low-parameter steam long-distance pipeline network 102 is between 0.2MPa and 0.6MPa;

The temperature in the ultra-high temperature hot water pipe network 301 is 180°C, and the temperature in the ultra-low temperature hot water pipe network 302 is 30°C;

The temperature in the water supply pipeline 401 of the grade 0 network is 180°C, and the temperature in the return water pipeline 402 of the grade 0 network is 30°C;

The temperature in the class I network water supply pipeline 501 is 170°C, and the temperature in the class I network return water pipeline 502 is 20°C;

The temperature in the water supply pipeline 601 of the class II network is 75°C, and the temperature in the return water pipeline 602 of the class II network is 50°C.

Further, the high-parameter long-distance steam pipeline network I101, the low-parameter long-distance steam pipeline network 102, the high-parameter long-distance steam pipeline network II201 and the long-distance pipeline network 202 after mixing high and low-pressure parameter steam are all prefabricated pipes. The prefabricated pipe includes an inner support pipe 1002 wrapped on the working steel pipe 1001 from the inside out, at least one layer of composite thermal insulation layer 1003, a soft thermal insulation sleeve 1005, a polyurethane foam 1006 and an outer protective sleeve 1007. A number of wooden supports 1008 are evenly arranged along the circumferential direction between the thermal insulation sleeve 1005 and the outer protective sleeve 1008 , and an inner sliding tube holder 1004 is also arranged outside the working steel pipe 1001 .

Further, the ultra-high temperature hot water pipe network 301, 0-level network water supply pipe 401 and I-level network water supply pipe 501 have the same structure, and all include a thermal insulation layer and an outer casing wrapped on the inner working pipe 3001 from the inside to the outside. 3005, the thermal insulation layer is a rigid multi-cavity ceramic thermal insulation layer 3002, a reflective layer 3003 and a polyurethane rigid foam thermal insulation layer 3004 in sequence from the inside to the outside.

Further, the bulk density of the hard multi-cavity ceramic thermal insulation layer 3002 is 170±15kg/m ³ , the thickness is 10 mm, the thickness of the reflective layer 3003 is 7 mm, and the thickness of the polyurethane rigid foam thermal insulation layer 3004 is 30-65mm, the material of the outer sleeve 3005 is polyethylene pipe, and the thickness is 2-16mm.

Compared with the prior art, the present invention has the following beneficial effects:

The invention can effectively utilize the small steam bulk density and convert and utilize the energy in the residual steam pressure, improve the energy efficiency ratio of the system, and alleviate the large temperature difference, ultra-long distance, and ultra-large height difference of the central heating system. The problem is to achieve ultra-long distance 100km, long-distance steam transmission 50km, long-distance hot water transmission 50km; large temperature difference design supply and return water temperature 180/30 ℃, temperature difference up to 150 ℃, increase water supply temperature, reduce return water temperature; large height difference, terrain The height difference is 200-450m.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the structural representation of relay steam mixing station in the present invention;

3 is a schematic structural diagram of a first-level energy station in the present invention;

4 is a schematic structural diagram of a third-level energy station in the present invention;

Fig. 5 is the structure schematic diagram of the fourth-level energy station in the present invention;

Fig. 6 is the structural representation of the prefabricated pipe in the present invention;

FIG. 7 is a schematic structural diagram of a hot water pipe network/water supply pipe in the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

As shown in Figure 1, a large temperature difference, long distance, large height difference central heating system includes a steam turbine unit 1, a relay steam mixing station 2, a first-level energy station 3, and a second-level energy station 4. , the third-level comprehensive energy station 5, the fourth-level energy station 6 and the heat user 7; between the steam turbine unit 1 and the relay mixing station 2, there are high-parameter long-distance steam transmission pipeline network I101, low-parameter long-distance steam transmission Pipe network 102 and steam condensate pipeline I103; between the relay steam mixing station 2 and the first-level energy station 3, a long-distance steam transmission pipe network II201 with high parameters, a long-distance transmission pipe network 202 with high and low pressure parameters after steam mixing, and Steam condensate pipeline II203; between the first-level energy station 3 and the second-level energy station 4, an ultra-high temperature hot water pipe network 301 and an ultra-low temperature hot water pipe network 302 are arranged; the second-level energy station 4 and the second-level energy station A level 0 network water supply pipeline 401 and a level 0 network return water pipeline 402 are arranged between the three-level comprehensive energy stations 5; 501. A level I network return pipeline 502; a level II network water supply pipeline 601 and a level II network return pipeline 602 are arranged between the fourth level energy station 6 and the heat user 7.

As a preferred solution, the steam pressure delivered by the high-parameter long-distance steam pipeline network I101 is greater than or equal to 0.6MPa, and the steam delivered by the low-parameter long-distance steam pipeline network 102 is between 0.2MPa and 0.6MPa; the ultra-high temperature hot water pipeline network 301 The internal temperature is 180°C, and the temperature in the ultra-low temperature hot water pipe network 302 is 30°C; the temperature in the water supply pipe 401 of the grade 0 network is 180°C, and the temperature in the return pipe 402 of the grade 0 network is 30°C; The temperature in the water supply pipe 501 is 170°C, and the temperature in the I-level network return pipe 502 is 20°C; the temperature in the II-level network water supply pipe 601 is 75°C, and the temperature in the II-level network return pipe 602 is 50°C.

As shown in Fig. 2, the relay steam mixing station 2 is located at a distance of 125km from the steam turbine unit; the relay steam mixing station 2 includes a pressure matcher 204, a pressure reducing valve 205, a condensate pressure pump I206 and a regulator Pressure tower 207, the high-parameter long-distance steam transmission pipeline network I101 is divided into two circuits, one high-parameter long-distance steam transmission pipeline network I101 is connected to the high-parameter long-distance steam transmission pipeline network II201, and the other high-parameter long-distance steam transmission pipeline network I101 and low-temperature steam transmission pipeline network I101 are connected. The parameter steam long-distance pipeline network 102 is respectively connected to the inlet of the pressure matcher 204, and the outlet of the pressure matcher 204 is connected to the long-distance pipeline network 202 after the high and low-pressure parameter steam is mixed. The low-pressure steam in the low-parameter steam long-distance pipeline network 102 is mixed by the pressure matcher 204 to improve the low-pressure steam parameters, and after the high-low-pressure parameter steam is mixed, the long-distance pipeline network 202 continues to be transported, and the low-grade steam in the steam turbine unit 1 is further utilized; The steam condensate pipeline II203 is connected to the inlet of the pressure regulating tower 207, and is located on the steam condensed water pipeline II203, and a pressure reducing valve 205 and a condensed water pressurizing pump I206 are sequentially arranged in the inflow direction of the pressure regulating tower 207. The outlet of the tower 207 is connected to the steam condensate pipeline I103.

As shown in FIG. 3 , the first-stage energy station 3 is located at a distance of 150km from the steam turbine unit. The first-stage energy station 3 includes an asynchronous generator 303, a steam-driven circulating pump 304, a peak heater 305, a basic heating The high-parameter steam long-distance pipeline network II201 is connected to the inlet of the peak heater 305, and the long-distance pipeline network 202 and the ultra-low temperature hot water pipeline network 302 are respectively connected after the high-low pressure parameter steam is mixed. The inlet of the basic heater 306, the long-distance pipeline network II201 of the high-parameter steam and the long-distance pipeline network 202 after the high-low pressure parameter steam are mixed are respectively connected through the asynchronous generator 303 and the steam-driven circulating pump 304, the ultra-high temperature The hot water pipe network 301 is connected to the outlet of the peak heater 305, and the two steam condensate pipes II203 flow out from the outlets of the peak heater 305 and the basic heater 306 respectively and then converge on the same steam condensate pipe II203, and the steam condenses The water pipeline II203 is provided with a condensed water pressurizing pump II307, and the peak heater 305 and the basic heater 306 are communicated through the ultra-low temperature hot water pipe network 302. The triple supply of heat, electricity and steam can be realized in the first-level energy station 3. The heat exchange is realized by setting up a steam-water heat exchange device through the peak heater 305 and the basic heater 306, and part of the steam condensed water is used as the constant pressure make-up water for the first heat supply station. ; By setting the asynchronous generator 303 to generate electricity to achieve self-consumption of electricity in the plant area; through the steam-driven circulating pump 304, the kinetic energy of the circulating water can be improved.

As shown in FIG. 1 , the second-stage energy station 4 is located at a distance of 175km from the steam turbine unit. The second-stage energy station 4 includes a condensate booster pump III403 and a tube-sheet combined heat exchanger 404. The high temperature hot water pipe network 301 is connected to the inlet of the tube sheet combined with the heat exchanger 404, and the outlet of the tube sheet combined with the heat exchanger 404 is connected to the water supply pipeline 401 of the 0-level network. The middle 180 ℃ high temperature hot water is used to produce steam for industrial steam supply load. The 0-level network return water pipeline 402 is connected to the inlet of the condensate water booster pump III403, and the outlet of the condensate water booster pump III403 is connected to the ultra-low temperature hot water pipe network 302 .

As shown in FIG. 4 , the third-level energy station 5 is located at a distance of 1100 km from the steam turbine unit, and the third-level energy station 5 includes a generator 503, a heat exchanger 504, an evaporator 505, an absorber 506, a condenser 507 and condensate pressure pump IV508; the 180°C hot water in the 0-level network water supply pipeline 401 passes through the generator 503, the heat exchanger 504 and the evaporator 505 to release heat in sequence, and the 30°C hot water after cooling passes through the 0-level The network return water pipeline 402 flows out; the circulating water at 20 ° C in the I-level network return water pipeline 502 is pressurized by the condensate water pressurizing pump IV508, and then is heated to 170 ° C by the absorber 506 and the condenser 507 successively, and then passes through I The level network water supply pipeline 501 flows out, and the I level network return water pipeline 502 and the heat exchanger 504 are sequentially connected with the I level network water supply pipeline 501 .

As shown in FIG. 5 , the fourth-level energy station 6 is a residential heat exchange station, and the structure of the fourth-level energy station 6 is the same as that of the third-level energy station 5 . The fourth-level energy station 6 includes a generator VI603, a heat exchanger VI604, an evaporator VI605, an absorber VI606, a condenser VI607 and a condensate pressure pump VI608; the hot water in the first-level network water supply pipeline 501 passes through in turn The generator VI603, the heat exchanger VI604 and the evaporator VI605 release heat, and the cooled hot water flows out through the II-level network return pipe 602; the circulating water in the II-level network return pipe 602 passes through the condensate water pressure pump VI608 After pressurization, the temperature is increased through the absorber VI606 and the condenser VI607 in sequence, and then flows out through the II-level network water supply pipeline 601. The II-level network return water pipeline 602, the heat exchanger VI604 and the II-level network water supply pipeline 601 are sequentially connected.

As shown in FIG. 6 , the high-parameter long-distance steam pipeline network I101, the low-parameter long-distance steam pipeline network 102, the high-parameter long-distance steam pipeline network II201, and the long-distance steam pipeline network 202 after mixing high and low-pressure parameters are all prefabricated pipes , the prefabricated pipe includes an inner support pipe 1002 wrapped on the working steel pipe 1001 from the inside to the outside, at least one layer of composite insulation layer 1003, a soft insulation sleeve 1005, a polyurethane foam 1006 and an outer protective sleeve 1007, so A number of wooden brackets 1008 are evenly arranged in the circumferential direction between the soft thermal insulation sleeve 1005 and the outer sheathing sleeve 1008 , and an inner sliding tube holder 1004 is also arranged outside the working steel pipe 1001 . The positional connection relationship between the inner sliding tube holder 1004 and other components belongs to the prior art.

As shown in FIG. 7 , the ultra-high temperature hot water pipe network 301 , the water supply pipe 401 of the 0-level network and the water supply pipe 501 of the I-level network have the same structure, and all include a thermal insulation layer wrapped on the inner working pipe 3001 from the inside to the outside. and the outer casing 3005, the thermal insulation layer is a rigid multi-cavity ceramic thermal insulation layer 3002, a reflective layer 3003 and a polyurethane rigid foam thermal insulation layer 3004 in sequence from the inside to the outside.

As a preferred solution, the bulk density of the rigid multi-cavity ceramic thermal insulation layer 3002 is 170±15kg/m ³ , the thickness is 10 mm, the thickness of the reflective layer 3003 is 7 mm, and the thickness of the polyurethane rigid foam thermal insulation layer 3004 The thickness is 30-65mm, the material of the outer sleeve 3005 is polyethylene pipe, and the thickness is 2-16mm.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and modifications can be made. These improvements and modifications It 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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