Method for simultaneous production of electric and thermal energy using secondary heat energy from industrial plants and power plant for its implementation

 

The invention relates to the field of energy. In the process of co-production of electric and thermal energy as fuel use gas or liquid fuel, a second condensate flow result in thermal contact with the exhaust gases in the heat exchanger preheating the condensate is heated and served in the form of hot water in the heat exchanger with the return of cooled hot water in the heat exchanger preheating of the condensate, the third stream of the condensate is directed to the heat recovery from waste energy from industrial enterprises to form a pair, which overheat the exhaust gases getprotobyname installation and is served in the form of superheated steam into the combustion chamber, the fourth stream is sent to the heat exchanger hot water, fifth stream is cooled in the cooler condensate, mix with chilled hot waterafter the heat exchanger for hot water and lead in the condenser in contact with the exhaust gases, and by reducing the ambient temperature to the temperature at the start of heating and the following selected water vapor before combustion chamber and lead it in thermal contact with the hot water entering the heat exchanger. Energy is bienia, the waste heat waste energy from industrial enterprises, site selection, water vapor, and getprotobyname engine is provided with a heat exchanger steam superheating. The invention allows the heat of the burning fuel in full for heating and hot water. 2 N. p. F.-ly, 1 Il., 1 PL.

The invention relates to the field of energy, in particular the production of electric and thermal energy.

As adopted similar method for the production of electric energy, including the processes of heat utilization of secondary energy resources with the formation of steam, the expansion in the steam turbine and converting potential energy into mechanical energy and the simultaneous conversion of the latter into electrical power generator (see Rosengart Y. I. and other Secondary energy resources of ferrous metallurgy and their use /Y. I. Rosengart, B. I. Yakobson, H. A. Muradova. Kiev: the Head of the publishing house publishing Association“, Visha school 1988-328 C.).

The known method has the disadvantage that the temperature potential of recycled secondary heat energy is low, and consequently, low and temperament in work, small.

As the prototype accepted method for simultaneous production of electric and thermal energy, including the processes of compression of the air, burning it for fuel, mixing the products of combustion with water vapor, expansion of gas-steam mixture in getprotobyname installing and converting its potential energy into mechanical energy with the simultaneous conversion of the latter into electrical, heat recovery from exhaust gases in the recovery boiler with steam in the heat exchanger-water heater with the formation of the hot water of condensation from the exhaust gases, in the heat exchanger-water heater with a flow of condensate to the boiler and feed formed therein of water vapor in the combustion chamber (see EN 21792948 C1 IPC F 01 To 23/06, 10.02.2002).

As a prototype adopted energy installation comprising getprotobyname engine, comprising sequentially located a compressor, a combustion chamber with a supply of water steam and turbine associated shaft with a Converter of mechanical energy into electrical energy, and consistently located behind the turbine in the direction of exhaust gas heat recovery boiler, which is their outlet for water vapor and output hot water, the capacitor, the output of which the condensate is connected through the deaerator to the input of the boiler (see EN 2179248 C1 IPC F 01 To 23/06, 10.02.2002, paper 7 C.).

The known method has the disadvantage that it does not use the secondary heat energy from industrial plants for production of electric and thermal energy and has a low temperature of the condensate at the outlet of the condenser, which makes it useful to use his warmth.

The invention solves the problem of creating a method of production of electric and thermal energy by using the heat of the combusted fuel, recycled heat of exhaust gases of a power plant, as well as heat waste energy from industrial enterprises. This allows, first, it is useful to use the secondary heat energy to increase the production of electric energy and, secondly, to significantly raise the temperature potential of the condensate in the condenser of a power plant, which allows its use for warmth in full for heating and hot water. The latter allows to approach waste-free use of fuel resources in an industrial environment.

Item is with the process of compressing air, combustion of fuel in it, mixing the products of combustion with water vapor, expansion of gas-steam mixture in getprotobyname installing and converting its potential energy into mechanical energy with the simultaneous conversion of the latter into electrical, heat recovery from exhaust gases in the recovery boiler with steam in the heat exchanger preheating of the condensate with the formation of the hot water of condensation from the exhaust gases in the condenser with the flow of condensate to the boiler and feed formed therein of water vapor in the combustion chamber, according to the invention in use as a fuel gas or liquid fuel, the second condensate flow result in thermal contact with the exhaust gases in the heat exchanger preheating the condensate is heated and served in the form of hot water in the heat exchanger with the return of cooled hot water in the heat exchanger preheating of the condensate, the third stream of the condensate is directed to the heat recovery from waste energy from industrial enterprises to form a pair, which overheat the exhaust gases getprotobyname installation and is served in the form of superheated steam into the combustion chamber, the fourth flow Nardi after the heat exchanger preheating of the condensate, the fifth stream is cooled in the cooler condensate is mixed with the cooled hot water after the heat exchanger for hot water and lead in the condenser in contact with the exhaust gases, and by reducing the ambient temperature to the temperature at the start of heating and the following selected water vapor before combustion chamber and lead it in thermal contact with the hot water entering the heat exchanger.

The problem is solved in that the energy system, consisting of getprotobyname engine, comprising sequentially located a compressor, a combustion chamber with a supply of water steam and turbine associated shaft with a Converter of mechanical energy into electrical energy, and consistently located behind the turbine in the direction of exhaust gas heat recovery boiler, which is the output of a water vapour is connected to the combustion chamber getprotobyname engine, a heat exchanger heated condensate from the inlet water and the outlet for hot water, the condenser, the output of which the condensate is connected through the deaerator to the entrance of the boiler, according to the invention the installation is equipped with an additional heat exchanger, heat exchanger mountains is water vapor, the input and output of which are connected respectively to the output of the water vapour boiler and the inlet of the heat exchanger, and getprotobyname engine is provided with a heat exchanger overheating of the steam, which is located directly behind the turbine and is connected to an input on couple to the output of waste heat waste energy from industrial enterprises, and access to the combustion chamber getprotobyname engine, a heat exchanger heated condensate is connected to its output through the water directly to the input of the heat exchanger and through an adjustable valve to the inlet of the heat exchanger hot water, and their entrance to the exit of the heat exchanger, the output capacitor also connected to the input of the heat exchanger preheating the condensate directly to the entrance of the cooler condensate, as well as through the deaerator to the entrance of the heat exchanger waste energy from industrial enterprises and to the inlet of the heat exchanger hot water, and the entrance to the outputs of the cooler condensate and heat exchanger hot water.

A new set of essential features missing in the known technical solutions and significantly (3-4 times)owls and thus due to this several times to increase energy production while reducing size, mass and cost of a kilowatt of installed capacity of the power plant.

All these benefits are aimed at improving the efficiency of production through growth and reduce the cost of electricity.

The drawing shows a diagram of the power plant, implements the proposed method.

The power plant consists of getprotobyname of the engine 1, comprising sequentially located compressor 2, a combustor 3 and the turbine 4, the associated shaft with a compressor 2 and a Converter of mechanical energy into electrical energy 5. In the exhaust tract for the turbine in the path of movement of the exhaust gas are consistently located the superheat exchanger 6, which their input pair connected to the heat exchanger secondary energy resources 7 industrial enterprises, and output to the secondary zone of the combustion chamber 3, HRSG heat of the exhaust gas 8, whose output pair connected to the combustion chamber 3 and at the same time through the site selection a pair of 9 - to the entrance of the heat exchanger 10, the heat exchanger is heated condensate 11, whose output water connected simultaneously to the input of the heat exchanger 10 and through regulirovaniya 10, the condenser 14, the output of which the condensate is connected simultaneously through a deaerator (not shown) to the inputs of the heat exchanger secondary energy resources 7 industrial plants, waste-heat boiler 8, the heat exchanger preheating condensate 11, heat exchanger hot water 13 and cooler condensate 15 and the entrance of the condensate is connected to the outputs of the cooler 15 and condensate heat exchanger hot water 13.

The method is carried out by the power plant is as follows.

Atmospheric air through the compressor 2 getprotobyname of the engine 1 is fed to the combustion chamber 3, which direct the fuel and burned. The combustion products formed at the same time, mix with water vapor obtained in the recovery boiler 8. Obtained in the combustion chamber 3 of the gas-steam mixture is sent to a turbine 4, where it expands, turning potential energy into mechanical energy, which is simultaneously converted into electrical energy in the generator 5. The exhaust turbine 4 gas-steam mixture (exhaust gas) is sent to the heat exchanger overheating pair 6, which is partially disposed of its heat by overheated steam coming from the heat exchanger secondary energy resources 7 industrial Stylization 8, where by further utilization of their warmth receive superheated steam, which is also directed into the combustion chamber 3. After the waste heat boiler 8 exhaust gases directed into the heat exchanger preheating condensate 11, where due to the deep disposal of their warmth heats the condensate, which is fed to the heat exchangers 10 and through the control valve 12 into the heat exchanger hot water supply 13, and the cooled exhaust gases are directed into the condenser 14, where they are additionally cooled and condense vapor when mixed with a continuously fed there by the condensate, chilled in the cooler condensate 15 and the heat exchanger hot water 13. The condensate obtained in the condenser 14, is divided into several streams: one of them is directed to the input of the heat exchanger secondary energy resources 7 industrial enterprises, the other input of the boiler 8, the third input of the heat exchanger preheating condensate 11, and the fourth to the entrance of the heat exchanger hot water supply 13, and a fifth input to the chiller condensate 15.

Compared with the prototype of the proposed method of operation of a power plant providing work using recycled secondary heat energy Promyslov operation of the power plant can significantly increase the efficiency of the conversion process in the operation disposed of warmth secondary energy resources, which include the processes of melting and heat treatment of metal, calcining dolomite, chemical processes, combustion of waste, the processes of compression gas compressor stations and many others.

This is because thermal capacity of the recycled heat of technological processes low, which causes ineffective turning it into work.

This is confirmed by the following dependency:

L=Q(1-T0/Tt)

where L is the share of heat into work;

Q - disposed heat;

T0Ttis the absolute temperature, respectively, the environment and disposed of warmth.

From dependence shows that at a constant temperature T0the environment the more heat is converted into work, the higher its temperature Tt, which is defined as the temperature of the working fluid, to which she summed up. In the similar Ttdoes not exceed 550-573 K. Therefore, theoretical amount of the utilized heat into work at standard temperature atmosphere T0=288 K, does not exceed 50%. Taking into account the irreversibility of the processes of transformation of heat into work in the real heat engines is reduced to 15-18%.

In the proposed is of acesso increases up to Tt=1373-1523 To increase its share, turn in work, up to 81%. With the account of the processes of irreversibility in real getprotobyname engines it reaches 45-48% (vs. 15-18% similar).

At the same time sharply about 1.8-2.1 times increased and the electric power plant, which significantly reduces capital investment, and hence reduces the cost of a kilowatt of installed capacity. This is confirmed by the following dependence, from which it follows that the power plant is growing proportionally with the increase in temperature of the working fluid at the turbine inlet (potential recycled secondary heat energy)

Nt=GCpTt(1-1/PK-1/Kt)t,

where G is the flow rate of the working fluid;

Withp- enthalpy of the working fluid;

Ptthe degree of expansion of the working fluid in the turbine;

t- the adiabatic efficiency of the turbine;

Ntpower on the turbine shaft.

The table below shows comparative data for the power developed steam turbine installation (analogue) and getprotobyname engine by passing through them one is 825568.gif">

The presented data confirm the above-mentioned high efficiency of the proposed method of production of electric and thermal energy using heat waste energy from industrial enterprises.

While at the same time, due to the significantly large inflow of steam into the combustion chamber (more than 5 times) in comparison with the prototype, the temperature of the condensate in the condenser getprotobyname engine of the proposed power plant reaches 80-85With that enables full utilization of its heat to the needs of heating and hot water. The latter allows to approach to the creation of non-waste technology, the use of fuel resources.

Claims

1. Method for simultaneous production of electric and thermal energy, including the processes of compression of the air, burning it for fuel, mixing the products of combustion with water vapor, expansion of gas-steam mixture in getprotobyname installing and converting its potential energy into mechanical energy with the simultaneous conversion of the latter into electrical, heat recovery from exhaust gases in the boiler-utiliy gases in the condenser with the flow of condensate to the boiler and feed formed therein of water vapor in the combustion chamber, characterized in that in use as a fuel gas or liquid fuel, a second condensate flow result in thermal contact with the exhaust gases in the heat exchanger preheating the condensate is heated and served in the form of hot water in the heat exchanger with the return of cooled hot water in the heat exchanger preheating of the condensate, the third stream of the condensate is directed to the heat recovery from waste energy from industrial enterprises to form a pair, which overheat the exhaust gases getprotobyname installation and is served in the form of superheated steam into the combustion chamber, the fourth stream is sent to the heat exchanger hot water, moreover, if necessary, to him, I guess part of the hot water after the heat exchanger preheating of the condensate, the fifth stream is cooled in the cooler condensate is mixed with the cooled hot waterafter the heat exchanger for hot water and lead in the condenser in contact with the exhaust gases, and by reducing the ambient temperature to the temperature at the start of heating and the following selected water vapor before combustion chamber and lead it in thermal contact with the hot water entering the heat exchanger.

Jennie compressor, the combustion chamber with a supply of water steam and turbine associated shaft with a Converter of mechanical energy into electrical energy and consistently located behind the turbine in the direction of exhaust gas heat recovery boiler, which is the output of a water vapour is connected to the combustion chamber getprotobyname engine, a heat exchanger heated condensate from the inlet water and the outlet for hot water, the condenser, the output of which the condensate is connected through the deaerator to the entrance of the boiler, characterized in that the installation is equipped with an additional heat exchanger, heat exchanger hot water supply systems, waste heat waste energy from industrial enterprises, site selection, water vapor, the input and output of which are connected respectively to the output of the water vapour boiler and the inlet of the heat exchanger, and getprotobyname engine is provided with a heat exchanger overheating of the steam, which is located directly behind the turbine and is connected to an input on couple to the output of waste heat waste energy from industrial enterprises, and access to the combustion chamber getprotobyname engine, the heat exchanger is heated to the controlled valve to the inlet of the heat exchanger hot water, and his entrance to the exit of the heat exchanger, the outlet of the condenser is also connected to the input of the heat exchanger preheating the condensate directly to the entrance of the cooler condensate, as well as through the deaerator to the entrance of the heat exchanger waste energy from industrial enterprises and to the inlet of the heat exchanger hot water, and the entrance to the outputs of the cooler condensate and heat exchanger hot water.

 

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