Single pipe heat supply system

FIELD: heat power engineering.

SUBSTANCE: invention relates to centralized heat supply system using waste heat of turbines of condensing power stations and nuclear power stations by means of heat pumping plants. Proposed single pipe heat supply system includes steam turbines of power stations, (CPS, NPS), main heat lines delivering heated system water to serviced town and intertown systems and devices using heat and chemically cleaned system water for town demands. Used as heat source are steam compression heat pumping plants with working medium of thermodynamic cycle featuring low critical parameters, for instance, carbon dioxide which after compression in compressor is at supercritical pressure forming triangular Lorentz cycle. Used as low potential heat source is waste heat of turbines of power stations which is transmitted to evaporators of heat pumping plants according to closed circulating water circuit with pipelines to receive and discharge water into water supply source of power station. Used as heat carrier is mechanically cleaned water supply source which, after preliminary heating in first stage of heat exchanger-heater of heat pumping plant, gets for chemical water cleaning and then is after heated in second stage. Invention makes it possible to reduce power consumption to provide heat supply down to zero value, provides possibility to increase power output of power station owing to additional generation of power by gas turbine engines.

EFFECT: power consumption, improved economy characteristics of power station owing to additional generation of heat, improved ecological characteristics.

2 cl, 1 dwg

 

The invention relates to a power system, namely the centralized heat supply based on the use of waste heat turbine KES and nuclear power plants with heat pump installations.

The idea of a single tube heat from the steam turbine CHP was proposed by the author [1] with the purpose of heat supply of cities, located at far distances from CHP (up to 120-150 km), which allowed to considerably reduce the costs of development and operation of heating mains. It was further developed in the works of the authors [2] and serves as a prototype of the invention. Here dealt with the transfer of heat in Moscow from Konakovskaya GRES capacity of 2400 MW turbines K-300-240, located at a distance of 130 km from serviced city. Arrived in the city the heated water was used as coolant and as chemically treated water for urban use.

Technical solution [2] has the following disadvantages.

1. Required major and costly reconstruction of condensing turbines with a view to their transfer in heating mode.

2. Large selection of steam to heating needs led to a change in modes of flow of the turbine.

3. This has led to a reduction of electrical power GRES at 560-600 MW, which drastically worsened its technical and economic indicators.

These weaknesses of the technical solutions dramatically reduce the scope of its practical use.

Objectives of the invention are:

- complete elimination of deficiencies according to claims 1 and 2 and nedorabotki power turbines;

- reduced cost of electricity (p.3)associated with the provision of heating, until a zero value;

- the possibility of increasing the capacity of electric power at the expense of additional power generation gas turbine drive motors TNU;

- maximize the use of one-pipe heating due to its distribution on existing power plants, including nuclear power;

- ensuring the requirements of energy security in parts of the inadmissibility of the use of monotonia (gas) more than half of the fuel balance of cities and regions [3];

- environmental improvement as in serviced urban and placements KES, nuclear power plants, which reduces thermal pollution of the environment;

- improving the economic performance of the plant due to additional heat generation.

These goals are achieved by the fact that the exhaust heat power plant turbines partially or entirely used as a low-grade source of heat (NET) vapor compression heat pump units (HPU), and the transfer of heat to the evaporator of the heat pump unit is carried out using a closed-loop circulating water with piping DL the admission and discharge of water sources, water supply, thus the working fluid thermodynamic cycle of the heat pump unit is a substance with low critical parameters, such as carbon dioxide, which, after compression in the compressor is at supercritical parameters, forming a so-called triangular loop Lorentz energy efficiency which is higher the lower the temperature of the heat carrier (water network) at the entrance to the heat exchanger - heater TNU and this minimum temperature occurs in the project winter mode of operation of the University in the collection of network water from a source of technical water supply of the plant, which after mechanical cleaning enters the first stage heat exchanger - heater heat pump unit and then applied, after which to return for the final heat in the second stage heater and then served for one-pipe system accepted in the city, where it is used, as in the prototype of the invention, as a heat carrier for heating purposes and as chemically treated water for urban use, and to drive the heat pump unit can be used with electric, steam and gas turbine drive, and power may exceed the drive power of the University to produce additional electricity power plant.

The drawing shows a diagram of one-pipe heating system.

1 - condenser steam is urban; 2 - supply and drainage systems of technical water supply; 3 - loop circulating water condensers; 4 - TNU power plant; 5 - network water from a source of water supply; 6 - chemical water treatment system water; 7 - trunk heat pipe; 8 - peak boiler; 9 - urban consumers warmth; 10 - city TNU; 11 - maximum boiler heat pump unit; 12 - consumers of heat from the heat pump unit; 13 - cooled in the evaporator of the heat pump unit water supplied on the needs of the urban water supply; 14 - water network to the needs of domestic and process hot water.

She works as follows. The cooling water heated in the condenser 1 via path 3 (associated with process water supply system piping 2) comes as SPIT at TNU 4, where heat is mechanically purified water network 5, coming from the source of technical water supply to the required temperature for chemical water treatment 6. After HVO network water enters the second stage of heating and routed through the main heat pipe 7 is serviced by the city. Then the water is divided into two streams: designed for heating consumers 9 (using peak boiler 8) and to provide loads of domestic and process hot water 14. Since the temperature of water after heating appliances is 40-50°C this temperature potential uses with urban TNU 10, having your loop heat supply 12 also includes peak boilers 11. Cooled in the evaporator TNU network water is then forwarded to the city's water system 13.

Sources of information

1. Webparser. System of a heat supply of cities from the powerful power one-pipe circuit. Report on competition of a scientific degree of the doctor of technical Sciences. M., 1963.

2. Bearino, Iasmina, Lphone, Neelakantan. Heat a large city from the countryside TPP. Teploenergetika, No. 11, 1992.

3. Energy strategy of Russia for the period up to 2020, M., GU IES, 2001.

1. System one-pipe heating systems, including steam turbine power plants (KES, NPP), main pipes supplying hot water network in the serviced city and intercity systems and devices that use heat and chemically treated mains water for urban use, characterized in that as a heat source are used in the vapor compression heat pump plant (TPP) with the working fluid thermodynamic cycle having a low critical parameters, such as carbon dioxide, which, after compression in the compressor is at supercritical pressure, forming a triangular cycle Lorentz, as a low-grade source of heat is used spent replatforming power plants, which is passed to the evaporator of heat pump installations in a closed loop circulating water with pipes for intake and discharge of water in the source of technical water supply plant, and as a fluid - mechanically treated water from a source of water supply, which, after preheating in the first stage heat exchanger-heater heat pump unit goes to the water treatment and then degraves in the second stage.

2. Heating system according to claim 1, characterized in that the power of the gas turbine drive TNU exceeds the drive power and is used for additional power generation.



 

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