Contact-type steam-gas plant

FIELD: heat power engineering.

SUBSTANCE: invention can be used in contact-type steam-gas plants containing gas-turbine plants with injection of steam. Proposed contact-type steam-gas plant contains gas-turbine plant with compressor, combustion chamber and main gas turbine, recovery boiler with two-pressure steam circuits communicating at steam outlets by steam pipelines and with inlets of gas-turbine plant by high-pressure and low-pressure steam lines, respectively, and at inlet of heating carrier (gas), with gas outlet of gas-turbine plant. Contact-type steam-gas plant contains also gas cooler-condenser connected by condensate outlet through pumps and with condensate inlet of recovery boiler. To reduced gas pressure at exhaust of gas turbine, contact-type steam-gas plant is furnished with topping-up compressor communicating by compressed gas inlet with gas outlet of gas cooler-condenser, by gas outlet with surrounding medium, and overexpansion gas turbine communicating by gas inlet with gas outlet of recovery boiler and by gas outlet, with gas inlet of gas-cooler-condenser. Rotor of overexpansion gas turbine is coupled (for instance, is installed) on one shaft with rotors of gas-turbine plant and/or topping-up compressor.

EFFECT: increased efficiency of contact-type steam-gas plant owing to reduction of gas turbine exhaust gas pressure without consumption of useful power of plant.

1 dwg

 

The present invention relates to a power system and can be used in CCGT contact type (KGU)containing the gas turbine unit (GTU) with energy steam injection.

The effectiveness of KGU characterize the magnitude of the coefficient of performance (COP) of KGU and used it GTU. Known a number of technical solutions used in GTU, KGU to improve efficiency.

These include GTU pressure on the exhaust gas turbine (GT) below atmospheric. Known GTU /1, 2/, in the path of the exhaust gases which consistently has a gas turbine pererasseyaniya, refrigerator (gas cooler) and a booster compressor mounted on the same shaft with the turbine of pererasseyaniya. Due to the cooling of the working fluid in the gas cooler balance capacity turbine pererasseyaniya and the booster compressor (DC) in the optimal version is installed when the degree of compression in DC is higher than the degree of expansion in the turbine pererasseyaniya, and the pressure before the turbine pererasseyaniya (i.e. main GT) is below the pressure for DK, i.e. below atmospheric pressure. This increases the capacity of the gas turbine without increasing fuel consumption.

The disadvantage of this technical solution are relatively low efficiency, and excessive bulkiness of heat exchange on which orogovenia (gas cooler) due to the diversion of a large amount of heat in combination with a low pressure gas in the gas cooler.

Thermodynamically and economically more efficient technical solutions are based on recovery of GT exhaust heat to generate additional working fluid power couple one or more pressure supplied to the gas turbine directly or through steam turbine /3-6/.

The closest analogue (prototype) of the claimed invention is combined getprotobyname installation with exhaust gas heat recycling and regeneration of water from the vapor-gas stream (/6/p.27-28, figure 1). This KGU contains GTP containing a compressor, a combustion chamber (CC) and GT, steam heat recovery boiler (HRSG) one pressure (named /3/ teplotransservise circuit BGC)reported on the login for heating the fluid with the GT exhaust gas at the outlet for a couple to inputs of GTU on a couple, and the condenser-gas cooler of the contact type, which represents a heat exchange device for cooling of exhaust from the HRSG gas and condensation of water vapor supplied from KU in GTP /6/ (p.29, Fig.2). Gas cooler-condenser reported at the entrance of the cooled gas with the release of KU gas at the outlet of condensate through the condensate collector - sign-KU on the condensate outlet on the gas either directly or through the smoke from the external environment.

In KU warmth GT exhaust to produce steam supplied the inputs GTU (COP, GT) for a couple. From KU gas enters the gas cooler-condenser where it is cooled supplied it with water. In the process of cooling the gas in the gas cooler-condenser condensation occurs submitted to GTU pair, and partial condensation of the vapor formed during combustion of fossil fuel, to compensate for possible loss of flow of condensate of steam in the HRSG and implement the regeneration of steam in a closed cycle, without additional supply of water steam circuit KU water from external sources, thus providing a high level of autonomy and sustainability of the installation. The use of steam as an additional working fluid GT allows to significantly increase the capacity and efficiency of the installation with a more compact heat exchanger equipment compared with the previous version.

The disadvantage of this KGU (as well as all other CCPs contact type) are relatively large pressure loss in the gas tract KU and the gas cooler-condenser, which increases the pressure on the GT exhaust and reduces the efficiency of the installation. In addition, due to the fact that complete recovery of the condensate obtained in the gas cooler-condenser is practically impossible, in going from the gas contains a certain amount of residual moisture drops. This requires the installation of additional dry the La-heater flue gas to prevent wet corrosion of flues for gas cooler-condenser, that, in turn, leads to an additional increase of the pressure loss in the gas path of KGU and increase the cost of power to drive the fan.

The task of the invention is to increase the efficiency of KGU by reducing the gas pressure at the gas turbine exhaust at no cost useful power KGU.

This problem is solved due to the fact that the claimed KGU containing gas turbines, steam heat recovery boiler (HRSG), reported on the output pair of inputs (entrances) STU on the couple at the entrance of a heating fluid (gas) - the output of the gas turbine for gas, and the gas cooler-condenser (GOK), reported on the exit condensate inlet KU of condensate, according to the claimed invention KGU contains the booster compressor (DK), reported on the entry of compressed gas from the outlet of the gas cooler-condenser gas outlet gas - with the external environment, and gas turbine pererasseyaniya (STES), reported on the inlet gas exit KU gas at the exit of gas from the inlet of the gas cooler-condenser for gas, while the rotor of the gas turbine pererasseyaniya associated with the rotors of gas turbines and /or booster compressor.

Compression going from mine gases during the initial part of the DC comes with internal heat from the compressed gas consumed for the evaporation of residual moisture. Temperature, flow rate and heat capacity of the gas in the STE substantially revisit temperature, the flow rate and heat capacity of the gas in DC. As a result, the balance of the capacity of the STE and DK at optimal performance of these turbomachines is achieved when the degree of expansion in the STE significantly less compression in DC that reduces the pressure for the main GT and increase the power and efficiency of KGU compared to the prototype. At the same time, the compression ratio in DC is high enough to drain and overheating compressible in DC gas.

The invention is illustrated by the drawing, which schematically depicts an example implementation of the claimed KGU with a gas turbine of pererasseyaniya installed on the same shaft with the booster compressor.

This KGU contains GTU 1 compressor 2, combustion chamber 3 and the main GT 4, Q 5 with steam circuits of the two pressures provided at the output by a pair of steam pipes 6 and 7 to the inputs of the gas turbine 1 through a pair of high and low pressure in this case, with entrances on a couple of the combustion chamber 3 and the compressor 2, respectively, at the inlet of a heating fluid (gas) - the output of the gas turbine 1 gas. KGU also contains the gas cooler-condenser 8 provided at the output of the condensate through the pumps 9 and 10 to the input of the KU 5 condensate.

According to the invention, KGU contains booster compressor 11 is provided at the inlet for compressed gas from the outlet of the gas cooler-condenser 8 gas outlet for gas from the external environment, and the gas is Bina of pererasseyaniya 12, reported at the inlet gas exit KU 5 gas at the exit of gas from the inlet of the gas cooler-condenser 8 for gas. In this example, the rotor STE 12 kinematically connected (mounted on the same shaft 13) with the rotor DC.

In this example, the GOK 8 is a heat exchanger Assembly mixing (contact) type in which gas cooling and condensation of water vapor are produced by injection into the gas path GOK 8 large quantity of cooling (circulating) water. For this KGU equipped with a cooling unit 14 provided at the inlet for the cooled water through the pump 9 with the release of mine 8 on the mixture of condensate and circulating water, outlet for the cooled water from the mine entrance 8 to the circulating water. The electrical part of KGU contains the generator 15.

The rotor STE 12 may also be connected (mounted on the same shaft with the rotor of the gas turbine 1, and the transmission of power to the rotor DC from GTP and GTU 1 in this case would be carried out through an electric part, for example, by mounting on the shaft 11 DK motor.

The device operates as follows.

The warm exhaust GT 4 coming in the TOP 5, produce energy pairs two pressures applied to the inputs of the gas turbine 1 and a couple, with pairs of e comes from the TOP 5 on the steam pipe 6 into the combustion chamber 3, and pairs n on the steam line 7 in an intermediate region of the compressor 2. The ear is Jamie from KU 5 gases are in the STE 12 and further complex 8, which also serves chilled circulating water from the cooling unit 14. In mine 8 circulating water is heated and the gases are cooled, thus energy couples and a part of water vapor formed in the gas turbine 1 combustion of fossil fuels, are condensed. The resulting condensate with heated circulating water pumped by the pump 9. Circulating water is removed for cooling in the cooling unit 14, and the condensate pump 10 serves to input RL 5 condensate. Residual condensate is carried away with leaving chilled gases supplied to the input DC 11, where they are compressed to the pressure of the external environment, while providing them with overheating drainage.

The flow rate of gases in DK 11 is less than the flow rate of gases through the STE 12 at the rate returned to KU 5 (through the pump (10) of the condensate. The heat capacity of the gas in DK 11 below the heat capacity of the gas in the STE 12 due to the removal of part of the water vapor in mine 8. The average temperature of the working fluid in DC 11 in optimum performance significantly below average temperatures in the STE 12 due to cooling of the gases in the mine 8. As a result, the power consumed to drive the DK-11, produced in STE 12 with a smaller degree of expansion than the compression ratio in DC 11, the pressure in front of the STE 12 and GT 4 is below the pressure at the exhaust GT prototype and even below atmospheric pressure (pressure of the external environment), the capacity and efficiency To the GU increase.

Temperature for GT 4 decreases, the steam generation East in KU 5 is reduced, the temperature of the gas at the TOP 5 growing. In this example, the presence of KU 5 steam of the low pressure circuit provided by the steam pipe 7 is the output of a pair with an intermediate region of the flow part of the compressor 2, inhibits the reduction of total steam capacity KU and the increase in the gas temperature for the TOP 5 due to the increase in steam generation n /5/ and thereby increases the growth efficiency of KGU associated with the use of the claimed device.

The above example is given merely to illustrate the invention and does not exhaust all possible options for its implementation. In particular, the power transfer from the STE to DK and (or) to GTU (the connection between their rotors) can be realized through the electric part, containing in this case, the drive motor. RL is the output of a couple of e can communicated with the entrance to GTU on a couple of e, not directly, but through a steam turbine. In this case, the rotor of the steam turbine can be mounted on the same shaft with the rotor of the DC or mechanically connected through a gear. The compressor of the gas turbine in its staging area may also be provided with one or more inputs on the water. KU may contain not two, but one, three or more steam contours of one, three or more pressures, and may also be reported at the output or outputs its the th water steam circuit to the input or inputs of the compressor not only on a couple of n, but high water /4/ and other pressure. The mine can also be equipped with a hydraulic connection at the outlet for condensate from the compressor inlet on the water, etc.

SOURCES of INFORMATION

1. Gas turbine installation. Auth. certificate No. 267257, prior. from 06.03.1969.

2. Perelstein KAPYSHEV research and Development of gas turbine engines with speed heat. Abstract. Disna SOIC. academic sttn - Kazan, KAI, 1976.

3. Gas turbine plant with energy steam injection /Century Belyaev, A. Markelov - FSUE MMPP “Salut” // gas Turbine technology, July-August 2002, p.20-24 (http : //www.qtt.ru).

4. Patent Germany DE1990026, publ. 06.07.2000,

5. RF patent №2208689, publ. 20.07.2003,

6. Combined getprotobyname plant with a capacity of 16 to 25 MW with heat recovery of exhaust gases and regeneration of water from the vapor-gas flow / Romanov V.I., Krivutsa VA //Teploenergetika, No. 4, 1996.

Combined-cycle power plant contact type (KGU)containing the gas-turbine unit (GTU), a steam boiler (HRSG), reported on the output pair with inputs (entrances) STU on the couple at the entrance of a heating fluid (gas) - the output of the gas turbine for gas, and the gas cooler-condenser provided at the output of the condensate to the entrance KU for condensate, characterized in that KGU contains a booster compressor is provided at the inlet for compressed gas from the outlet of the gas cooler-is condensator gas, the output gas from the external environment, and gas turbine pererasseyaniya provided at the inlet for gas to exit KU gas at the exit of gas from the inlet of the gas cooler-condenser for gas, while the rotor of the gas turbine pererasseyaniya associated with the rotors of gas turbines and (or) a booster compressor.



 

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The invention relates to the field of power engineering

FIELD: heat power engineering.

SUBSTANCE: invention can be used in contact-type steam-gas plants containing gas-turbine plants with injection of steam. Proposed contact-type steam-gas plant contains gas-turbine plant with compressor, combustion chamber and main gas turbine, recovery boiler with two-pressure steam circuits communicating at steam outlets by steam pipelines and with inlets of gas-turbine plant by high-pressure and low-pressure steam lines, respectively, and at inlet of heating carrier (gas), with gas outlet of gas-turbine plant. Contact-type steam-gas plant contains also gas cooler-condenser connected by condensate outlet through pumps and with condensate inlet of recovery boiler. To reduced gas pressure at exhaust of gas turbine, contact-type steam-gas plant is furnished with topping-up compressor communicating by compressed gas inlet with gas outlet of gas cooler-condenser, by gas outlet with surrounding medium, and overexpansion gas turbine communicating by gas inlet with gas outlet of recovery boiler and by gas outlet, with gas inlet of gas-cooler-condenser. Rotor of overexpansion gas turbine is coupled (for instance, is installed) on one shaft with rotors of gas-turbine plant and/or topping-up compressor.

EFFECT: increased efficiency of contact-type steam-gas plant owing to reduction of gas turbine exhaust gas pressure without consumption of useful power of plant.

1 dwg

FIELD: pipeline transport.

SUBSTANCE: power plant is additionally provided with a turbine expander provided with an electric generator. Power generated by the steam plant is directed to the main gas pipeline, and a part of power is directed to the turbine expander with electric generator to produce electric power.

EFFECT: enhanced reliability and efficiency.

1 cl, 1 dwg

FIELD: power engineering.

SUBSTANCE: system has boiler, steam turbine, electric generator, deaerator, feeding pump, and is additionally provided with gas-steam turbine plant block having low-pressure combustion chamber, steam-gas mixture heat utilization block and separated water utilization block. Steam-gas mixture heat utilization block has utilization boiler with high-pressure steam generator and additional low-pressure steam generator. Block for using separated water via low-pressure nutritious water pipeline is connected to low-pressure steam generator of utilization boiler and via irrigation water pipeline is connected to irrigation device of steam-gas mixture heat utilization block. Input of high-pressure steam generator of utilization boiler is connected by steam-gas mixture pipeline to output of steam-gas turbine plant. Low-pressure steam generator of utilization boiler is connected via low-pressure steam generator to additional combustion chamber of steam-gas turbine plant. Block for using separated water via pipelines for low-pressure nutritious water, irrigation water and separated water is connected to block for utilization of steam-gas mixture heat and via pipelines for cooled down and heated network water - to base main line. High-pressure steam generator is connected via high-pressure nutritious water pipeline and high-pressure steam pipeline to base main line.

EFFECT: higher efficiency.

2 dwg

FIELD: power engineering.

SUBSTANCE: system has boiler, steam turbine, electric generator, deaerator and feeding pump, and additionally has steam-gas turbine plant block with low pressure burning chamber, steam-gas mixture heat utilization block and block for using separated water. Block for utilization of heat of steam-gas mixture has utilization boiler with steam generator of high pressure and additional low-pressure steam generator. Block for using separated water via low pressure nutritious water pipeline is connected to input of low pressure steam generator of utilization boiler and via irrigation water pipeline is connected to irrigation device of steam-gas mixture heat utilization block. Input of high pressure steam generator of utilization boiler is connected via steam-gas mixture pipeline to output of steam-gas turbine plant. Low-pressure steam generator of utilization boiler is connected via low-pressure steam pipeline to additional combustion chamber of gas-steam turbine plant. Block for using separated water via pipelines for low-pressure nutritious water, irrigation water and separated water is connected to steam-gas mixture heat utilization block, and via softened heated and deaerated nutritious water pipeline - to base heat and electricity main line. High-pressure steam generator is connected via high-pressure nutritious water pipeline and high-pressure steam pipeline to base main line.

EFFECT: higher efficiency.

2 dwg

FIELD: power engineering.

SUBSTANCE: heat exhausted from additional steam-gas turbine plant is utilized to generated high pressure steam and additionally low pressure steam. High pressure steam is sent to and expanded in thermal steam turbine. Low pressure steam is sent to additional low pressure combustion chamber of steam-gas turbine plant, to where also additional fuel is directed, temperature of steam-gas mixture is set mainly at level close to 900°C and expanded in low pressure steam-gas turbine. Nutritious water for generation of high pressure steam is taken from high pressure deaerator of main electrical heating line. Into steam-gas mixture, cooled down for generation of low pressure steam, irrigation water is injected, steam component of this steam-gas mixture is condensed, formed condensate is separated and then drained to tank for separated water. Least portion of separated water is used as nutritious water for generation of low pressure steam. Heat of most portion of separated water is used to heat up softened nutritious water, which is then deaerated and sent to heating network of open thermal system of main electrical heating line. Irrigation water cooled down during the process is fed for condensation of steam in steam-gas mixture.

EFFECT: higher efficiency.

2 dwg

FIELD: power engineering.

SUBSTANCE: method includes utilization of heat exhausted from additional steam-gas turbine plant for generation of high pressure steam and additional low pressure steam. High pressure steam is sent to and expanded in thermal steam turbine. Low pressure steam is fed to additional low pressure combustion chamber of steam-gas turbine plant, additional fuel is sent same way as steam, and temperature of steam-gas mixture is set mainly at level close to 900°C and it is expanded in low pressure steam-gas turbine. Nutritious water for generation of high pressure steam is fed from deaerator of high pressure heating and electrical line. Into steam-gas mixture, cooled down during generation of low pressure steam, irrigation water is injected, steam component of this steam-gas mixture is condensed, formed condensate is separated and drained into tank for separated water, from which cooled down irrigation water is fed for condensation of steam in steam-gas mixture. Least portion of separated water is used as nutritious water for generation of low pressure steam. Heat of most portion of separated water is used to heat a portion of network water from closed thermal system of main electrical and heating line.

EFFECT: higher efficiency.

2 dwg

FIELD: power and heat generation.

SUBSTANCE: proposed power and heating plant with open power and heat supply system including boiler unit, steam turbine, deaerator and feed pump includes steam-gas turbine plant unit with low-pressure afterburning chamber, steam gas mixture heat recovery unit containing recovery boiler with high-and-pressure steam generators, spraying device, gas cooler-condenser and separated water utilization unit. Separated water utilization unit is connected with input of low-pressure steam generator of recovery boiler through water softening set and deaerator. Spraying device is connected with raw water softening device of power and heating plant. Input of high-pressure steam generator of recovery boiler is connected with output of steam-gas-turbine plant. Low-pressure steam generator of recovery boiler is connected with additional afterburning chamber of steam-gas turbine plant. Separated water utilization unit is connected by pipeline of softened and deaerated low-pressure feed water with steam-gas mixture heat recovery unit and pipeline of softened, heated and deaerated make-up water with open power and heat supply system. High-pressure steam generator is connected by feed water and steam pipelines with power and heating plant.

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2 dwg

FIELD: heat supply systems.

SUBSTANCE: proposed steam power plant with additional steam turbines includes power-and-heating plant with open power and heat supply system, gas-turbine plant with recovery boiler and make-up water heating and deaerating unit including at least two additional steam turbines with contact condensers which are placed in softened make up water line. Output of power and heating plant unit is connected by pipeline with input of contact condensers of additional steam turbines of make up water heating and deaerating unit. Output of steam recovery boiler unit of gas-turbine plant unit is connected by steam line with input of additional steam turbines. Input of steam recovery is connected by feed water pipeline with make up water heating and deaerating unit. Output of make up water heating and deaerating unit is connected by make up deaerated water pipeline with system heaters of power and heating plant unit and by feed water pipeline, with input of recovery boiler of gas-turbine plant.

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2 dwg

FIELD: heat power engineering.

SUBSTANCE: proposed heat power-generating plant build around gas-turbine engine designed for driving main generator or turbocompressor and getting hot exhaust gases contains heat producing system, power generating system and automatic control and regulation system. Heat producing system employs heat of exhaust gases and includes recovery circuit with recovery boiler, pumping unit for circulating water under heating and piping manifold with valves and fittings. Heat producing system of plant is furnished with shell-and-tube heat exchanger providing transmission of produced heat from recovery circuit of heat producing system of plant into power-and-heat supply circuit of heat consumer. Piping manifold is furnished with driven valves providing delivery of hot water from recovery boiler both power-and-heat supply circuit and into circuit of power generating system. Power generating system consists of closed circuit equipped with heat exchange, pumping and reservoir equipment and equipment for condensing vapors of working medium, shutoff and regulating devices and recovery power-generating plant with steam-turbine drive. Closed circuit of power-generating system of plant contains multistage evaporation system of low-boiling hydrocarbon mixture using hot water, device for preliminary heating of condensate, system for condensing working medium vapors and device to remove non-condensed components of gaseous hydrocarbon mixture from low-boiling hydrocarbon mixture circuit. Preliminary heating of condensate is provided by hot vapors of hydrocarbon mixture getting out of steam turbine drive before their delivery into condensing system. System for automatic control and regulation of heat producing and power generating systems contains devices providing operation of recovery circuit of heat producing system in two modes, namely, heat producing and power generating ones.

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6 cl, 1 dwg

FIELD: heat power engineering.

SUBSTANCE: invention can be used in gas-turbine power-generating stations-gas-turbine thermoelectric plants and steam-gas plants operating on gaseous fuel. Proposed final-stage set of gas-turbine power-generating station contains steam waste-heat recovery boiler communicating through heat carrier end with exhaust gas output of gas-turbine engine of station, gas meter-turbocompressor, drive steam turbine with condenser and condenser pump, system of gas, steam and water pipelines with regulating and shutoff valves. Rotor of drive steam turbine is installed on one shaft with rotor of gas meter-turbocompressor and the latter communicates at gas end input with supply main line of gaseous fuel, and at gas end output, with gas-turbine engine. Drive steam turbine communicates at steam end input with steam end output of recovery boiler and at steam end output with steam end input of condenser. Condenser at condensate end output communicates through condenser pump with recovery boiler condenser end input. According to invention, gas meter-turbocompressor and drive steam turbine are made in form of common sealed structure in which shaft with rotors of gas meter-turbocompressor and drive steam turbine is provided with seal separating gas duct of gas meter-turbocompressor from steam duct of drive steam turbine. Gas meter-turbocompressor and drive steam turbine are made and installed on shaft so that steam pressure before seal from side of drive steam turbine exceeds gas pressure before seal from side of gas meter-turbocompressor at all operating duties of gas-turbine engine of station.

EFFECT: prevention of gas flows into steam ducts and getting of gas and steam into room with final-stage set.

1 dwg

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