RU2005264C1 - Method and system for heat supply to users - Google Patents

Abstract

Usage: in district heating systems with mixed heat load. The essence of the invention: cold water from the city conduit is passed through additional heat-exchanging surfaces of the condenser (KS), and then water is supplied to the city water supply networks to consumers. In this case, the waste heat of cooling of the KS is utilized, seasonal fluctuations in energy consumption and condensation on surfaces are eliminated cold water pipelines In addition, the throughput of engineering systems increases, metal consumption, consumption of fuel and energy resources and environmental pollution are reduced boiling heat medium releases 1 Id

Description

IS

The invention relates to a power system and a power utility system and can be used primarily with centralized hep / power supply systems with a mixed heat load.

A known method of heat supply to consumers, including the supply of steam for heating network water in the main and peak heaters of a station heat treatment plant, cooling the steam spent in the turbine in a surface condenser, the supply of network water through a supply heat pipe to heat-consuming installations with seasonal heat load and heat load of domestic hot water supply, return to the station of chilled network water through a return heat pipe, preparation of hot water in heating units, under lyu- of a heat conductor, podpitoch- feed-water from the municipal water conduit into the return heat conductor preliminary heating in its surface condenser, the cold water to consumers urban watercourses.

A known heat supply system for implementing such a method, comprising a surface condenser of a steam turbine with a casing tube bundle, main and peak heaters of the network water of the heat treatment plant, a network pump supplying and returning heat pipes, consumers of seasonal heat load and domestic hot water connected to the heat pipes, city cold water conduit, make-up water pipeline connected to the city cold water conduit and through a tube bundle surface condenser to the return heat pipe (see .. for example, USSR copyright certificate No. 1281.832, class F 24 D 17/00, 1983).

The disadvantage of this method is the reduction in the fraction of the heat load covered by the cogeneration turbine in the heating season due to a seasonal decrease in the temperature of cold water taken by consumers from cold water pipelines.

There is also known a method of heat supply to consumers, including steam supply for heating network water in the main and peak heaters of a station heat treatment plant, cooling the steam spent in the turbine in a surface condenser, supplying network water through a heat supply pipe to heat-consuming installations with seasonal heat load and heat load of domestic hot water supply, return to the station of chilled network water via a return heating pipe, preparation of hot water at a heating station connected to the heat pipelines, heating cold water of the inlet piping from the city water supply in heat points with the heat of the return heat pipe, supplying make-up water from the city water pipe to the return heat pipe with its preliminary heating in the surface condenser, supplying cold water to consumers through the city water pipe (see, for example, Ruzavin GS Field tests of subscriber input with cold water heating (Izvestia Vysshikh, Construction and Architecture, 1975, No. 9, p. 140-145).

A known heat supply system that implements such a method, comprising a surface condenser of a steam turbine with a casing tube bundle, main and peak heaters of the network water of a heat treatment plant, a network pump, supply and return heat pipes, consumers of seasonal heat load and domestic hot water connected to heat pipes, city cold water conduit, cold water inlet piping to a heat point from the city water conduit, heat exchanger on the pipelines cold water ode connected to the return heat pipe, make-up water pipe connected to the city cold water conduit and through the tube bundle of the surface condenser to the return heat pipe (see, ibid., p. 141, Fig. 1).

l The disadvantage of this method of heat supply is the low efficiency of heat supply to consumers caused by the following factors: heat and fuel are consumed due to seasonal fluctuations in the temperature of cold water taken by consumers, gas consumption from gas pipelines and electricity from electricity grids increase, consumption of metal and other resources increases in engineering systems, subscriber inputs and cooling systems for turbine condensers are becoming more expensive, environmental pollution is increasing, and the degree of centralization of energy supply on the basis of a thermal power station, there are large unproductive losses, the capacity of engineering systems (heat pipelines, gas pipelines, electric networks, water pipelines) is underutilized, etc.

The aim of the invention is to increase the efficiency of heat supply to consumers by heating the cold water of the city conduit in the additional heat exchange surfaces of the turbine condenser, and then supplying water to the city water supply networks to consumers.

This goal is achieved in that with a method of heat supply to consumers, comprising supplying steam for heating network water in the main and peak heaters of a station heat preparation unit, cooling the steam spent in the turbine in a surface condenser, supplying network water through a heat supply pipe to the heat consuming installations with seasonal heat load and heat load of domestic hot water supply, return to the station of chilled network water through a return heat pipe, preparation of water in the heat points connected to the heat pipes, feed water from the city water pipe to the return pipe with its preliminary heating in the surface condenser, cold water supply to consumers through the city water pipe, cold water from the city water pipe is passed through additional heat-exchanging surfaces of the condenser, and then supply heated water to city water supply networks to consumers.

The drawing shows a heat supply system for implementing the proposed method.

It contains a surface condenser 1 of a steam turbine with a heating tube bundle 2, main 3 and peak 4 heaters of the network water of the heat treatment plant, a network pump 5, supplying 6 and return 7 heat pipes, consumers a, b, seasonal heat load and heat load of domestic mountains of which the water supply connected to the heat pipes, city cold water conduit 8 with regulating capacity 9 (or clean water tank), make-up water pipe 10, additional tube bundle 11 condenser , Connecting lines 12 and 13 to a pump 14, a regulator 15 regulating water temperature and a capacity of 16, 17, the city water piping network.

The heat supply system works like this. The steam that was spent at the station in the turbine is fed to the condenser 1 for cooling. The cooled mains water from consumers a, b, c is supplied to the station through the return heat pipe 7, is heated in the network 3 l peak 4 heaters and the network pump 5 is supplied through the heat supply pipe 6 to heat points of consumers. By

city water conduit 8 cold water with a temperature of tx (in open water supply sources 0.5-1.5 ° C) is supplied to the regulating tank 9 (or pure water tank) and pump 14 through g-pipelines 12 and 10 - s heating pipe bundle 2 of condenser 1 and to the make-up line of heat conduit 7, as well as to additional condensate-orz 1 tube bundle 1. In tube bundle 11, cold steam is heated by the heat of cooling of the condenser from temperature tx to temperature tx 25-30 ° C and is supplied through pipeline 13 into the tank 9, from which the distribution pump

5 pipelines 17 goes to consumers m. In this case, the automatic controller 15 maintains the temperature of cold water in pipelines 17 at the level tp, where 1p is the dew point temperature on the surface

0 pipelines of cold water that excludes obrazovgchie condensate and surface corrosion of metal pipelines of cold water. This also eliminates the need. Necessity of thermal insulation of cold water pipelines. At a drawdown below the hourly average of pipelines 17, water from the tube bundle 11 simultaneously enters the reservoir 16, and at maximum drawdowns, the reservoir 16 is emptied. AT

For the purpose of reducing the capacity 16 or even completely eliminating it, consumers of heating units can be connected with storage tanks 18 (for example, as a consumer

at).

5 The use of the invention eliminates the seasonal fluctuations in the temperature of the consumed cold water and the related seasonal variations in the flow rates of hot and cold water, heat and heat carrier from the supplying heat pipes, gas from gas pipelines and electricity from electric networks 2. In addition, condensate surfaces of cold water pipelines and the need for their thermal insulation, 25-35% reduction in the cost of hot and make-up water; the cost of heat and heat .- from heat pipelines is reduced by 25-35%, 350-450 tfu / year for 1 GD / h reduces costs

0 fuel due to additional utilization of the waste heat of cooling of turbine condensers and increasing the degree of centralization of energy supply to consumers at the CHP plant; The thermal power of peak and local boiler houses, metal and other resources spent on engineering systems (including .. and turbine condenser cooling systems), one-time and operating costs, as well as unproductive losses in engineering systems, including sources, are also reduced power supply. The specific throughput of the Sheneyn systems is increasing, the heat load of the cogeneration extraction of turbines and the generation of electricity at thermal power plants is decreasing.

Claims (2)

SUMMARY OF THE INVENTION 1. A consumer heat supply method, including steam supply for supplying: main water and main peak heaters of a station heat preheater, cooling the steam spent in a turbine in a surface condenser, supplying water through a heat supply pipe to heat-consuming installations with season-. heat load and heat load of domestic hot water supply / return to the station of chilled network water through a return heat pipe, pre-heated hot water at heat points connected to heat pipes, supply of fresh water from the city water pipe with a co-operative heat pipe with its preliminary heating in the surface condenser G. YITSRO and cold water supply from the city of Srez. tel through the city water conduit, characterized in that the cold water of the city water conduit is passed through additional heat-exchange surfaces to ndensatora and then supplied podogrezagr environmental pollution waste burn fuel, which improves the environment and reduces conservation costs Wednesday. (56) Copyright certificate of the USSR N ° 1281832, class F 24 D 17/00, 1983. melt water in city water networks l to consumer m. 2. A heat supply system comprising a surface condenser of a steam turbine with a casing tube bundle, main and peak heaters for the network water of the station heat treatment unit, a network pump supplying and returning heat pipes, consumers of seasonal heat load and domestic hot water supply connected to the heat pipes , city cold water conduit, make-up water pipeline connected to the city cold water conduit and through a tube bundle of surface condenser5 to selfless heat conductor, characterized in that it further; It contains a tube bundle in a surface condenser, connecting pipelines with a pump and a temperature controller, while a city water conduit is connected via piping to an additional tube bundle of a surface condenser. 17