阅读说明：本技术 一种供热蒸汽余热利用的水、热同产同送系统及工作方法 (Water and heat co-production and co-delivery system utilizing waste heat of heating steam and working method ) 是由 王妍 吕凯 马汀山 居文平 许朋江 张建元 石慧 薛朝囡 邓佳 王春燕 万小艳 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种供热蒸汽余热利用的水、热同产同送系统及工作方法,本发明利用汽轮机组工业蒸汽余热加热海水淡化产品水,利用高温产品水向外输送,实现对外水、热同送。本发明采用汽轮机组的抽汽在蒸汽冷却器中对产品水进行加热,降温后的抽汽送入供汽联箱中,避免了采用减温水直接对蒸汽降温所造成的能量浪费。本发明通过蒸汽冷却器将淡化产品水加热成高温产品水并对外送出,实现了电厂对外水、热同送。与现有的水、热分送系统相比,简化了系统管道布置,降低管道建设和维护成本。(The invention discloses a water and heat co-production and co-delivery system utilizing heat supply steam waste heat and a working method. The invention adopts the extraction steam of the steam turbine set to heat the product water in the steam cooler, and the extracted steam after temperature reduction is sent into the steam supply header, thereby avoiding energy waste caused by directly reducing the temperature of the steam by using the temperature reduction water. The invention heats the desalted product water into high-temperature product water through the steam cooler and sends the high-temperature product water out, thereby realizing the simultaneous delivery of external water and heat by the power plant. Compared with the existing water and heat distribution system, the system simplifies the pipeline arrangement of the system and reduces the pipeline construction and maintenance cost.)

1. A water and heat cogeneration and delivery system utilizing heat supply steam waste heat is characterized by comprising a boiler (1), wherein a steam outlet of the boiler (1) is connected with a steam turbine unit (2) through a pipeline, the steam turbine unit (2) is connected with a first generator (3), a steam exhaust outlet of the steam turbine unit (2) is connected with a condenser (4) and a multi-effect distillation seawater desalination device (6) through a pipeline, the condenser (4) is cooled by seawater, a seawater outlet of the condenser (4) is connected with the multi-effect distillation seawater desalination device (6) through a pipeline, the multi-effect distillation seawater desalination device (6) is used for separating seawater to generate strong brine and product water, a product water outlet of the multi-effect distillation seawater desalination device (6) is connected with a steam cooler (7) and a conveying pipeline (8), a steam extraction outlet of the steam turbine unit (2) is connected with the steam cooler (7) through a pipeline, the high-temperature product water outlet of the steam cooler (7) is connected with the conveying pipeline (8) through a pipeline, the conveying pipeline (8) is connected with the user side, the temperature-reducing steam extraction outlet of the steam cooler (7) is connected with the steam supply header (5) through a pipeline, and the steam extraction of the steam turbine set (2) is mixed with the temperature-reducing water and then is sent into the steam supply header (5).

2. The system for synchronously producing and delivering water and heat by utilizing the waste heat of heating steam as claimed in claim 1, wherein a first valve (10) is arranged on a connecting pipeline between a steam exhaust outlet of the steam turbine unit (2) and the multi-effect distilled seawater desalination device (6);

a second valve (11) is arranged on a connecting pipeline between the seawater outlet of the condenser (4) and the multi-effect distilled seawater desalination device (6).

3. The system for simultaneous production and delivery of water and heat by using the waste heat of heating steam as claimed in claim 1, wherein a third valve (12) is arranged on a connecting pipeline between the multi-effect distillation seawater desalination device (6) and the steam cooler (7);

a fourth valve (13) is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device (6) and the conveying pipeline (8).

4. The system for simultaneous production and delivery of water and heat by using the waste heat of heating steam as claimed in claim 1, wherein a fifth valve (14) is arranged on a connecting pipeline between a steam extraction outlet of the steam turbine set (2) and the steam cooler (7);

a sixth valve (15) is arranged on a connecting pipeline between the steam extraction outlet of the steam turbine set (2) and the steam supply header (5);

a seventh valve (16) is arranged on a connecting pipeline between the steam outlet of the steam cooler (7) and the steam supply header (5).

5. The system for simultaneously producing and delivering water and heat by utilizing the waste heat of heating steam as claimed in claim 1, wherein a user side comprises a heat exchange device (9), the heat exchange device (9) is connected with the conveying pipeline (8), the heat exchange device (9) is used for exchanging heat between high-temperature product water delivered from the conveying pipeline (8) and urban heat supply network return water, transferring heat to the heat supply network water, and the high-temperature product water after heat exchange becomes normal-temperature product water to be supplied to a water plant.

6. The system for simultaneous production and delivery of water and heat by using the waste heat of heating steam as claimed in claim 5, wherein an eighth valve (17) is arranged on a connecting pipeline between the conveying pipeline (8) and the heat exchange device (9);

a ninth valve (18) is arranged on a connecting pipeline between the conveying pipeline (8) and the water plant.

7. The system for simultaneous production and delivery of water and heat by using the waste heat of heating steam as claimed in claim 1, wherein an insulating layer is arranged outside the delivery pipe (8).

8. The system for simultaneous production and delivery of water and heat by using the waste heat of heating steam as claimed in claim 1, wherein the condensed water of the multi-effect distilled seawater desalination device (6) enters the condensed water system of the steam turbine set.

9. The working method of the water and heat cogeneration and delivery system for supplying heat and steam waste heat utilization according to claim 1, characterized by comprising the following steps:

when the seawater desalination device is started, part of the heated seawater at the cooling water outlet of the condenser (4) is used as raw seawater to enter the multi-effect distilled seawater desalination device (6), part of exhaust steam of the turbine unit (2) is used as a driving heat source to enter the multi-effect distilled seawater desalination device (6), and after multi-stage distillation of the raw seawater and the exhaust steam is completed in the multi-effect distilled seawater desalination device (6), the seawater is separated to generate strong brine and product water;

when the steam turbine unit supplies heat to the outside simultaneously, the extracted steam of the steam turbine unit (2) enters a steam cooler (7) to heat product water, the extracted steam after heat exchange enters a steam supply header (5), and high-temperature product water at the outlet of the steam cooler (7) enters a conveying pipeline (8) to be conveyed to a user side;

when the unit does not supply heat to the outside, the product water at the outlet of the multi-effect distilled seawater desalination device (6) is sent into a conveying pipeline (8) to be conveyed to the user side.

10. The working method of a water and heat cogeneration and delivery system using waste heat of heating steam according to claim 9, wherein when the seawater desalination plant is started, the first valve (10) and the second valve (11) are opened;

when the unit supplies heat to the outside at the same time, opening a third valve (12), a fifth valve (14), a seventh valve (16) and an eighth valve (17), and closing a sixth valve (15), a fourth valve (13) and a ninth valve (18);

when the unit does not supply heat to the outside, the third valve (12), the fifth valve (14), the seventh valve (16) and the eighth valve (17) are closed, and the sixth valve (15), the fourth valve (13) and the ninth valve (18) are opened.

Technical Field

The invention belongs to the field of heat supply and seawater application, and particularly relates to a water and heat co-production and co-delivery system utilizing waste heat of heat supply steam and a working method.

Background

The centralized heating is an organization mode of energy regional production for building a centralized heat source in an industrial production area and an area where urban residents gather and providing production and living heat for enterprises and residents in the area and around the area. The centralized heat supply can save fuel, is easy to be large-sized and mechanized, and can also solve the problems of smoke pollution, ash and slag fuel stacking and the like in a centralized manner, so the system has obvious economic, environmental and social benefits, and is one of the important infrastructures for modern town construction at present.

However, the coverage rate of central heating in China is still at a lower level at present, a central heating system is built only in main towns of northern provinces, and the southern cities and towns and vast rural areas in China basically have no central heating facilities and can only heat by independent heating modes such as a natural gas furnace, an air conditioner, an electric furnace, honeycomb briquette and the like. The urban central heating coverage rate of developed countries such as Finland and Denmark is up to 90%, and the national average level is over 60%. The development of the house and land industry in the future, the improvement of the urbanization rate, the removal of small regional boilers, the construction and the transformation of pipe networks in old urban areas and the like create huge and continuous demands for the central heating market, and the central heating industry in China has very wide development prospects.

On the other hand, with the rapid development of power generation by clean energy such as wind and light, thermal power generating units are gradually shifting from a main position of power supply to a bottom position of power supply in a power system. In order to improve the profitability and the survival competitive power of a power plant, a thermal power generating unit needs to transform from single electric energy supply to an electricity, heat, steam, cold, water and other comprehensive energy supply base, and the diversity of externally supplied products is enriched. For a coastal power plant, seawater desalination and power generation thermodynamic cycle are combined, and the steam required by seawater desalination is provided by using the exhaust steam of the power plant, so that the seawater desalination cost can be greatly reduced, and the profit of the power plant is improved.

The pressure and temperature requirements of an industrial extraction steam source of a coal-fired unit and a heat user cannot be completely matched, and the steam source is usually subjected to temperature reduction and pressure reduction to be suitable parameters and then is supplied out, so that the great waste of steam energy is caused.

Disclosure of Invention

The invention aims to overcome the defects and provides a water and heat co-production and co-delivery system and a working method for utilizing the waste heat of heating steam, so that the co-delivery of external water and heat is realized, and the energy waste is reduced.

In order to achieve the purpose, the water and heat cogeneration and delivery system utilizing the waste heat of the heating steam comprises a boiler, wherein a steam outlet of the boiler is connected with a steam turbine unit through a pipeline, the steam turbine unit is connected with a first generator, a steam exhaust outlet of the steam turbine unit is connected with a condenser and a multi-effect distillation seawater desalination device through a pipeline, the condenser is cooled by seawater, a seawater outlet of the condenser is connected with the multi-effect distillation seawater desalination device through a pipeline, the multi-effect distillation seawater desalination device is used for separating seawater to generate strong brine and product water, a product water outlet of the multi-effect distillation seawater desalination device is connected with a steam cooler and a delivery pipeline, a steam extraction outlet of the steam turbine unit is connected with the steam cooler through a pipeline, a high-temperature product water outlet of the steam cooler is connected with the delivery pipeline, the delivery pipeline is connected with a user side, and a temperature-reducing steam extraction outlet of the steam cooler is connected with a steam supply header through a pipeline, the extracted steam of the steam turbine set is mixed with the desuperheating water and then sent into the steam supply header.

A first valve is arranged on a connecting pipeline between the steam outlet of the steam turbine set and the multi-effect distilled seawater desalination device;

and a second valve is arranged on a connecting pipeline between the seawater outlet of the condenser and the multi-effect distilled seawater desalination device.

A third valve is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device and the steam cooler;

and a fourth valve is arranged on a connecting pipeline of the multi-effect distilled seawater desalting device and the conveying pipeline.

A fifth valve is arranged on a connecting pipeline between the steam extraction outlet of the steam turbine set and the steam cooler;

a sixth valve is arranged on a connecting pipeline between the steam extraction outlet of the steam turbine set and the steam supply header;

and a seventh valve is arranged on a connecting pipeline between the steam outlet of the steam cooler and the steam supply header.

The user side comprises a heat exchange device, the heat exchange device is connected with the conveying pipeline, the heat exchange device is used for exchanging heat between high-temperature product water sent by the conveying pipeline and urban heat supply network return water, heat is transferred to the heat supply network water, and the high-temperature product water after heat exchange becomes normal-temperature product water and is supplied to a water plant.

An eighth valve is arranged on a connecting pipeline of the conveying pipeline and the heat exchange device;

and a ninth valve is arranged on a connecting pipeline between the conveying pipeline and the water plant.

The heat-insulating layer is arranged outside the conveying pipeline.

And the condensed water of the multi-effect distilled seawater desalination device enters a condensed water system.

A working method of a water and heat cogeneration and delivery system for utilizing waste heat of heating steam comprises the following steps:

when the seawater desalination device is started, partial temperature-rising seawater at a seawater outlet of the condenser is used as raw seawater to enter the multi-effect seawater distillation desalination device, partial exhaust steam of the steam turbine unit is used as a driving heat source to enter the multi-effect seawater distillation desalination device, and after the multi-stage distillation of the raw seawater and the exhaust steam is completed in the multi-effect seawater distillation desalination device, the seawater is separated to generate strong brine and product water;

when the unit supplies heat to the outside simultaneously, the extracted steam of the steam turbine unit enters a steam cooler to heat product water, the extracted steam after heat exchange enters a steam supply header, and high-temperature product water at the outlet of the steam cooler enters a conveying pipeline and is conveyed to a user side; on the user side, the high-temperature product water exchanges heat with the urban heat supply network backwater in the heat exchange device, heat is transferred to the heat supply network water to become normal-temperature product water, and then the normal-temperature product water is supplied to a water plant or other fresh water users.

When the unit does not supply heat to the outside, the product water at the outlet of the multi-effect distilled seawater desalination device is conveyed into a conveying pipeline to be conveyed to a user side. On the consumer side, the product water is delivered directly to a water plant or other fresh water consumer.

When the seawater desalination device is started, opening a first valve and a second valve;

when the unit supplies heat to the outside at the same time, opening a third valve, a fifth valve, a seventh valve and an eighth valve, and closing a sixth valve, a fourth valve 13 and a ninth valve;

when the unit does not supply heat to the outside, the third valve, the fifth valve, the seventh valve and the eighth valve are closed, and the sixth valve, the fourth valve 13 and the ninth valve are opened.

Compared with the prior art, the invention utilizes the waste heat of the industrial steam of the steam turbine set to heat the seawater desalination product water, and utilizes the high-temperature product water to convey outwards, thereby realizing the simultaneous delivery of the external water and the heat. The invention adopts the extraction steam of the steam turbine set to heat the product water in the steam cooler, and the extracted steam after temperature reduction is sent into the steam supply header, thereby avoiding energy waste caused by directly reducing the temperature of the steam by using the temperature reduction water. The invention heats the desalted product water into high-temperature product water through the steam cooler and sends the high-temperature product water out, thereby realizing the simultaneous delivery of external water and heat by the power plant. Compared with the existing water and heat distribution system, the system simplifies the pipeline arrangement of the system and reduces the pipeline construction and maintenance cost.

Drawings

FIG. 1 is a system diagram of the present invention;

the system comprises a boiler 1, a boiler 2, a steam turbine unit 3, a generator 4, a condenser 5, a steam supply header 6, a multi-effect distillation seawater desalination device 7, a steam cooler 8, a conveying pipeline 9, a heat exchange device 10, a first valve 11, a second valve 12, a third valve 13, a fourth valve 14, a fifth valve 15, a sixth valve 16, a seventh valve 17, an eighth valve 18 and a ninth valve.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1, a water and heat cogeneration and delivery system utilizing waste heat of heat supply steam comprises a boiler 1, a steam outlet of the boiler 1 is connected with a steam turbine unit 2 through a pipeline, the steam turbine unit 2 is connected with a first generator 3, a steam exhaust outlet of the steam turbine unit 2 is connected with a condenser 4 and a multi-effect distilled seawater desalination device 6 through a pipeline, the condenser 4 is cooled by seawater, a seawater outlet of the condenser 4 is connected with the multi-effect distilled seawater desalination device 6 through a pipeline, the multi-effect distilled seawater desalination device 6 is used for separating seawater to generate strong brine and product water, a product water outlet of the multi-effect distilled seawater desalination device 6 is connected with a steam cooler 7 and a delivery pipeline 8, a steam extraction outlet of the steam turbine unit 2 is connected with the steam cooler 7 through a pipeline, a high-temperature product water outlet of the steam cooler 7 is connected with the delivery pipeline 8 through a pipeline, and the delivery pipeline 8 is connected with a user side, the temperature-reducing steam extraction outlet of the steam cooler 7 is connected with the steam supply header 5 through a pipeline, and the extracted steam of the steam turbine set 2 is mixed with the temperature-reducing water and then is sent into the steam supply header 5. The outside of the conveying pipeline 8 is provided with an insulating layer to reduce the heat loss of the high-temperature product water in the conveying process.

A first valve 10 is arranged on a connecting pipeline between the steam outlet of the steam turbine unit 2 and the multi-effect distilled seawater desalination device 6; a second valve 11 is arranged on a connecting pipeline between the seawater outlet of the condenser 4 and the multi-effect distilled seawater desalination device 6. A third valve 12 is arranged on a connecting pipeline between the multi-effect distilled seawater desalination device 6 and the steam cooler 7; a fourth valve 13 is arranged on a connecting pipeline of the multi-effect distilled seawater desalination device 6 and the conveying pipeline 8. A fifth valve 14 is arranged on a connecting pipeline between the steam extraction outlet of the steam turbine unit 2 and the steam cooler 7; a sixth valve 15 is arranged on a connecting pipeline between the steam extraction outlet of the steam turbine set 2 and the steam supply header 5; a seventh valve 16 is arranged on a connecting pipeline of the steam cooler 7 and the steam supply header 5.

The user side includes heat transfer device 9, and heat transfer device 9 connects pipeline 8, and heat transfer device 9 is used for exchanging heat with the high temperature product water that pipeline 8 sent and city heat supply network return water, gives the heat supply network water with heat transfer, and the high temperature product water after the heat transfer becomes normal atmospheric temperature product water, supplies with the water works. An eighth valve 17 is arranged on a connecting pipeline of the conveying pipeline 8 and the heat exchange device 9; a ninth valve 18 is arranged on a connecting pipeline between the conveying pipeline 8 and the water plant.

And the condensed water of the multi-effect distilled seawater desalination device 6 enters a condensed water system.

A working method of a water and heat cogeneration and delivery system for utilizing waste heat of heating steam comprises the following steps:

steam at the outlet of the boiler 1 enters a steam turbine set 2 to do work by expansion to drive a first generator 3 to generate power, and exhaust steam of the steam turbine set 2 enters a condenser 4 to be condensed and then returns to a set condensed water system. When the extracted steam of the steam turbine set and the desuperheating water are mixed to reach the external supply temperature, the mixture enters the steam supply header 5 through the sixth valve 15 and is then supplied out through an external steam supply pipeline.

When the seawater desalination device is started, the first valve 10 and the second valve 11 are opened, part of the heated seawater at the cooling water outlet of the condenser 4 is used as raw seawater to enter the multi-effect distillation seawater desalination device 6, part of exhaust steam of the turbine unit 2 is used as a driving heat source to enter the multi-effect distillation seawater desalination device 6, after multi-stage distillation of the raw seawater and the exhaust steam is completed in the multi-effect distillation seawater desalination device 6, the exhaust steam is condensed to release heat and returns to the outlet of the condenser 4, and the seawater is separated to generate strong brine and product water.

When the unit supplies heat to the outside simultaneously, a third valve 12, a fifth valve 14, a seventh valve 16 and an eighth valve 17 are opened, a sixth valve 15, a fourth valve 13 and a ninth valve 18 are closed, the extracted steam of the steam turbine unit 2 enters a steam cooler 7 to heat product water, the extracted steam after heat exchange enters a steam supply header 5, and high-temperature product water at the outlet of the steam cooler 7 enters a conveying pipeline 8 to be conveyed to a user side; on the user side, the high-temperature product water exchanges heat with the urban heat supply network backwater in the heat exchange device 9, heat is transferred to the heat supply network water to become normal-temperature product water, and then the normal-temperature product water is supplied to a water plant or other fresh water users.

When the unit does not supply heat to the outside, the third valve 12, the fifth valve 14, the seventh valve 16 and the eighth valve 17 are closed, the sixth valve 15, the fourth valve 13 and the ninth valve 18 are opened, and the product water at the outlet of the multi-effect distilled seawater desalination device 6 is sent into the conveying pipeline 8 to be conveyed to the user side. On the consumer side, the product water is delivered to a water plant or other fresh water consumer via a ninth valve 18. The extracted steam of the unit enters the steam supply header 5 through the sixth valve 15 after being cooled by the desuperheating water, and then is supplied out through an external steam supply pipeline.