Heat supplying method

FIELD: power engineering, in particular, centralized heat supplying systems.

SUBSTANCE: method includes heating grid water in grid heaters of heating energy plants, feeding hot water via feeding water main to heating and hot water providing systems, cooling of reversed grid water by heat pump plants, positioned at heat stations, returning of cooled water via reverse water main to grid heaters, while heat pump plant is made cascading with finalizing water loop, in upper branch of cascade, positioned at heat station, secondary heating of water of heating system is performed due to additional cooling of reverse water of heating system, by water loop of grid water and heating system upper and lower cascades of thermal pump plant is closed, and in lower branch of cascade, positioned at thermal power station, heating of cooled reversed grid water is performed due to heat of condensation of steam processed in turbine.

EFFECT: higher efficiency of heat power station and heat supplying grid, increased heat productiveness of heat supplying system.

1 cl, 1 ex, 1 dwg

 

The invention relates to a power system, in particular for district heating systems.

Known installation of heating and hot water supply (A.S. EN 2155302 C1. Installation of heating and hot water. IPC F 24 D 17/02, 3/18, 2000), including a heat source of low potential, the circulation path, the heat pump evaporator and the condenser, the heating system as a heat source of low potential contains a receiving well of wastewater Sewerage networks placed in it a heat exchanger and a vibrator. The unit will provide heat and hot water to individual residential house, however, to heat the apartment house in the city such installation is impossible due to insufficient heat heat source of low potential. On the other hand, the advantages of district heating is not used, when one source of heat serves combustion device number of consumers located separately (Tikhomirov C.V., Sergeenko AS thermal engineering, heat and ventilation. - M.: stroiizdat, 1991. - S-347).

As a prototype accept A.S. EN 2095581 C1. The heating system. IPC 6 F 01 17/02, 1997. Heating system consisting of a cogeneration plant, which includes the main steam circuit, cooling water circuit, the primary circuit is Oh network water heaters hot water and heating circuit of the heating system of the Elevator, equipped with a heat pump installation, posted on heating units and heat pump system connected to the reverse path network water of the primary circuit to the entrance-exit of the evaporator, and the path of return water heating systems - input-output capacitor, with regulator valves on the respective paths. The output of the heat pump installation path of the evaporator is connected to the pipeline reverse water network, which network cooled water is transported and fed to the inlet of the condenser of the turbine and the input of the heat pump installation path of the evaporator is connected to the reverse pipeline network water circulation pump circulating water of the primary circuit. Reverse water network after the condenser of the turbine enters the network, the heater and then into the pipeline direct water network.

The main disadvantage of the prototype is that cooled the reverse system water enters the condenser of the turbine, the output of which the water temperature will not exceed an average of 20°C. For example, for a steam turbine T-100-130 (Thermal engineering Handbook / edited by Vnesenii and Pdelete. T.1 - M.:Energy,1975. - S-373) pressure exhaust steam is 0,054 MPa, and the temperature of cooling water (estimated) respectively equal to 20°C. Therefore, water with the temperature not bhodemon to heat up to the standard temperature (current average water temperature, coming out of the heaters in the return water pipe heating system is 70° (Tikhomirov C.V., Sergeenko AS thermal engineering, heat and ventilation. - M.: stroiizdat, 1991. - P.194)), for which it is necessary to install additional network heater and implement an additional selection of steam, thereby reducing the production of steam power and reducing the absolute efficiency of the turbine (Ryzhkin VIA Thermal power station. - M.: Energoatomizdat, 1987. - P.26-27).

The purpose of the invention is to improve the efficiency of thermal power plants and heating networks, to increase the heat output of the heating system.

The essence of the invention lies in the fact that implemented method of heating comprising heating network water network in the pre-heaters, cogeneration power plants, hot water feeding pipeline for heating systems and hot water, cooling, reverse circulating water through heat pumps, placed on calorific points, the return chilled water reverse trunk pipeline network in the heaters, wherein the heat pump unit cascades with closing the water loop in the upper branches of the cascade, is placed on the heating point, carry out the secondary podagra the water heating system due to the additional cooling return water heating system, water loop circulating water and heating systems enclose the upper and lower cascades heat pump installation, and in the lower branches of the cascade, posted on thermal power plant, carry out heating of the chilled inverse network of water due to the condensation heat in the turbine exhaust steam. Improving thermal efficiency and increase the heat output of the heat supply system is achieved as follows: decrease in water temperature in the return main pipe carried by the upper branch of the cascade reduces the consumption of network water and reduce the cost of pumping fluid; at lower temperature in the return pipeline decreases the average temperature of the heat carrier (water network), which contributes to cost reduction of heat losses (Sokolov DEATH, district Heating and heat networks. - M. - L.: Gosenergoizdat, 1963. - S-327). In addition, the use of the condensation heat in the turbine exhaust steam in the first stage of the network of the heater (the lower branch of the cascade) increases the efficiency of the station, as selected pairs previously received network in the heater, is directed into a turbine to generate additional electricity.

The drawing shows a device for realization of the proposed method. The device comprises a cascade heat pump unit (HPU). The lower wet the cascade, posted on thermal power plant consists of a condenser 1 and the evaporator 3, the compressor 2 and the inductor 5 heat pump (TN). The upper branch of the cascade, is placed on the heating point, consists of a capacitor 13, the evaporator 16, the compressor 15 and the inductor 14 of the heat pump. Water loop water network consists of a network of lower stage heater (condenser 1 heat pump), a network of heater top step 6, the peak hot water boiler 7, the feeding of a heat pipe network water 18, water heater heating system 11, the reverse of the district heating network water 19 and the network of the pump 17. Water loop heating system consists of a water heater heating system 11, the surge tank 8, the heating devices 9, the circulating pump 10, water heater secondary hot water heating system (condenser 13 heat pump), heating appliances 12, cooler water heating system (evaporator 16). Water loop water network and water heating systems enclose the upper and lower branches of the cascade heat pump installation. When the device is water circulation pump 10 is supplied to the elements of the heating system. In the water heater 11 water heating system heats network water, and the radiator 9, the heat given to the consumer. Secondary heating water heating systems Khujand is realized in the condenser 13 TONS by tahaliyani return water heating system in the evaporator 16 of the heat pump, in this case, the consumer of the heating devices 12 are given extra warmth. Cooled water heating system, entering the water heater 11, selects from a network of water greater amount of heat, significantly reducing the temperature of the return water network. Cooled reverse network water through line 19 network pump 17 is supplied to the condenser 1 TN, where it is heated by the heat of condensation of the exhaust turbine 4 pair. Condensation of the steam produced in the evaporator 3 TONS. Heated in the first stage of the network heater (condenser 1 TN) network water is heated in the second stage network heater 6 selected steam (as needed network water can optionally be heated during the peak hot water boiler 7). Longer network water is supplied to the feed conduits 18 to the water heater 11. The decrease in water temperature in the return line 19 a heating system reduces heat losses in heat networks, and also at the same flow rate increases, the throughput of the heat load of the heat network. In addition, the use of the condensation heat in the turbine exhaust steam into the lower branches of the cascade increases the efficiency of the station, as selected pairs previously received network in the heater, is directed into a turbine to generate additional electricity.

Example. Method heat the PE lisaem by installing the heating system heat pump working fluid R11, for which the temperature and pressure of the evaporation and condensation respectively equal to: tn=34°S, tk=85°C, Pn=0,146 MPa, Pk=0,na (Dobrovolsky A.P. Tables and charts working fluids used in marine refrigeration. - Leningrad: Sudostroenie, 1966. - 87). The rate of increase of pressure Pk/Pn=3,82 allows to obtain the values of efficiency heat pump η=0,7, and the conversion efficiency of the heat pump ϕ=5. Source parameters of the heat carrier in the heating system and the heating system as follows: the temperature of the water in forward and reverse routes thermal network, respectively, t1=110°C, t2=65°C; temperature of hot water in the heating system tG=95°; return water temperature heating system t0=70°C. After installation of the heat pump: t1=110°S, t2=46°S, tG=95°S, tP=80°S, t0=41°S, where tP=80° - the temperature of the secondary heating water heating systems. The network water consumption for heating in this case is reduced to 1.42 times.

The method of heating implement (install a heat pump in thermal power station) on the block with a capacity of 250 MW turbine T-250-240. In accordance with the main characteristics of the unit share of heat consumed for electricity generation, accounting for 64%, and vacation is EPLA heating systems - 36% (Thermal engineering Handbook / edited by Vnesenii and Pdelete. T.1 - M.:Energy,1975. - S). For such blocks, the average efficiency for the supply of electricity is 45%, and the efficiency of heat generation - 90% (Directory of energy industrial enterprises. V.3. Thermal engineering /Under the General editorship Vnesenii. - M. - L.: Energy, 1965. - S.312). In General, thermal efficiency of the plant ηwith(V.A. Kirillin engineering thermodynamics. - M.: Energoatomizdat, 1983. - S) is determined by the formula:

where ηwithThe efficiency of the station with a combined production of heat and electricity;

le- useful work spent on electricity production;

lt- useful work spent on the production and transmission of heat to the consumer;

q1- the number of summed heat released during the combustion of fuel;

x - share summed up the heat, aimed at electricity production;

ηe- thermal efficiency of the plant for the supply of electricity;

u - share summed up the heat directed to the production of thermal energy.

ηtThe efficiency of thermal power stations heat generation.

The conversion factor of the heat pump (Yantovsky H. the vapor compression heat pump installation. - M.: Energoizdat, 1982. - S) ϕ is determined by p the equation:

where ϕ - conversion factor of the heat pump.

qTHthermal performance of the heat pump;

lTH- the operation of the compressor of the heat pump.

Since the implementation of the proposed method of extra generated energy is spent on the drive operation of the compressor of the heat pump, thermal efficiency of the plant in this case, thewith regard to dependencies (1) and (2), is determined by the equation:

where- thermal efficiency of the plant during the implementation of the proposed method;

m - share summed up the heat lose in the condenser of the turbine, but when the method is returned to the cycle heat pump and directed to the production of additional electricity.

To block T-250-240 x=0,64, y=0,36, ηe=0,45, ηT=0,9. For the first stage of the network of the heater, the share of m=0.2 and the conversion factor of the cascade heat pump in this case can be accepted ϕ=3. By the formula (1) efficiency of the station with a combined production of heat and electricity will be ηC=0,612, and thermal efficiency of the plant during the implementation of the proposed methodwhen this generation (electricity) the AI increases by 2.3%. Condition improving plant efficiency: ϕ>1/ηe.

The method of heating comprising heating network water network in the pre-heaters, cogeneration power plants, hot water feeding pipeline for heating systems and hot water, cooling, reverse circulating water through heat pumps, placed on calorific points, the return chilled water reverse trunk pipeline network in the heaters, wherein the heat pump unit cascades with closing the water loop in the upper branches of the cascade, is placed on the heating point, carry out the secondary heating water heating systems due to the additional cooling return water heating system water loop circulating water and heating systems enclose the upper and lower the cascade heat pump installation, and in the lower branches of the cascade, posted on thermal power plant, carry out heating of the chilled inverse network of water due to the heat of condensation of the exhaust turbine pair.



 

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