CN205243745U - Natural gas distributed energy system coupled with solar energy - Google Patents

Natural gas distributed energy system coupled with solar energy Download PDF

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Publication number
CN205243745U
CN205243745U CN201521108664.6U CN201521108664U CN205243745U CN 205243745 U CN205243745 U CN 205243745U CN 201521108664 U CN201521108664 U CN 201521108664U CN 205243745 U CN205243745 U CN 205243745U
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natural gas
hot water
waste heat
utilization device
solar
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胡孟起
肖俊峰
张宇博
朱立春
高松
李园园
李兆瑜
连小龙
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Xian Thermal Power Research Institute Co Ltd
Huaneng Power International Inc
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Xian Thermal Power Research Institute Co Ltd
Huaneng Power International Inc
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

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  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

A solar-coupled natural gas distributed energy system, comprising: the system comprises a gas turbine generator set, a waste heat utilization device, a solar heat collection system and the like, wherein natural gas sequentially passes through two stages of natural gas heaters and then enters a combustion chamber; air enters a combustion chamber after passing through an air compressor, and the air and natural gas enter a gas turbine after being combusted in the combustion chamber; the exhaust of the gas turbine enters a waste heat utilization device, and the exhaust of the waste heat utilization device enters the atmosphere; hot water generated by the solar heat collection system is used as a heat source of the first-stage natural gas heater, and hot water generated by the waste heat utilization device is used as a heat source of the second-stage natural gas heater; heating natural gas to rated temperature in the first-stage heater preferentially, and heating the insufficient part in the second-stage heater; the hot water demand of a hot water user is preferentially met by the waste heat utilization device, and the insufficient part is provided by the solar heat collection system; the steam demand of the steam user is generated and satisfied by the waste heat utilization device.

Description

Natural gas distributed energy system coupled with solar energy
The technical field is as follows:
the utility model belongs to the technical field of the energy utilization, concretely relates to natural gas distributed energy system of coupling solar energy.
Background art:
compared with the traditional centralized energy supply mode, the distributed energy system is directly oriented to users, produces and supplies energy on site according to the requirements of the users, has multiple functions and can meet the requirements of multiple targets. Compared with the traditional centralized energy supply mode, the distributed energy is close to the user side, a large power grid and a large heat supply network do not need to be built, the remote transmission of the energy is avoided, the construction investment can be saved, and the line loss and the operating cost are reduced. The distributed energy can be distributed photovoltaic, distributed wind energy, a natural gas distributed energy system (also called a natural gas combined cooling heating and power system) and the like. The natural gas distributed energy system consists of a gas turbine, a waste heat boiler, a steam turbine, an absorption heat pump, a refrigerating machine and other equipment, has multiple energy supply functions of power generation, heat supply, refrigeration and the like, can effectively realize cascade utilization of energy, and achieves the comprehensive utilization rate of the energy of more than 70%. Compared with other distributed energy systems, the natural gas distributed energy system has the advantages of stable and various energy output, and is particularly suitable for industrial parks and building groups with various energy requirements (electric power, hot water, cold water, steam and the like).
The gas turbine is a key device of a natural gas distributed energy system, and a pressure regulating station and a pre-processing module are arranged between a natural gas external pipe network and the gas turbine in order to meet the requirement of the gas turbine on the quality of natural gas fuel. The pressure regulating station is mainly used for carrying out coarse filtration and pressure regulation on natural gas entering a plant, and the front-end pretreatment module mainly comprises a natural gas fine filtration and heating unit. The natural gas temperature is a key parameter of fuel quality, affects the safe and efficient operation of a natural gas distributed energy system, and has two main reasons: firstly, due to joule-thompson effect, natural gas can be cooled in the pressure reduction process of a pressure regulating station, condensate water is easy to generate or hydrocarbon is easy to liquefy, and damage is caused to conveying equipment or the outer surface of a pipeline is iced, so that gas turbine manufacturers all require the fuel inlet temperature of a unit to be within a certain range, and the specific requirements of different types of units are different, for example, a GEPG6581B unit requires the fuel inlet temperature to exceed at least the natural gas dew point by 28 ℃ but the maximum temperature is not more than 125 ℃, and a GEPG9171E requires the fuel inlet temperature to exceed at least the natural gas dew point by 28 ℃ but the maximum temperature is not more; secondly, the thermal efficiency of the gas turbine and the dynamic characteristics of the combustion chamber are greatly influenced by the temperature of natural gas, so the temperature of the natural gas must be accurately controlled before the natural gas enters the combustion chamber, for example, the GE adopts a 9F model (typically 9f.03, 9f.05 and the like) of a DLN2.0+ combustion system, an electric heater is required to heat the natural gas before the unit is connected to the power grid, a natural gas performance heater is put into the unit after the unit is connected to the power grid, and finally the temperature of the natural gas reaches a rated operation parameter of 185 ℃.
The existing natural gas heating technology mainly adopts modes of electric heating, water bath heating, steam extraction heating of a steam turbine, hot water heating of an outlet of a waste heat boiler and the like. The heating modes are high-energy and low-usage, and finally high-grade fossil energy is consumed, so that the energy utilization rate of a natural gas distributed energy system or a combined cycle power generation system is reduced.
Solar energy is a clean, pollution-free renewable energy source, and the development and utilization of the solar energy are considered as important components of an energy strategy by countries in the world. Solar heat utilization is one of the main ways of solar energy utilization. Solar heat utilization can be divided into three types of low temperature, medium temperature and high temperature according to the temperature of working media. Because solar radiation has the characteristics of strong dispersibility and low energy flux density, and is suitable for outputting to obtain a medium-low temperature heat source, the medium-low temperature heat utilization is the most important field of low-cost and large-scale application of solar energy at present. The solar heat collection technology is one of solar medium and low temperature heat utilization technologies, mainly comprises two modes of vacuum tube heat collection and flat plate heat collection, is mature in technology and remarkable in energy-saving effect, and is widely applied to the field of hot water supply of residents in China. However, due to the characteristic of poor continuity of solar energy, reliable heat source output is difficult to ensure, if the solar energy is used for district heating, a heat storage system is very huge, and low-cost efficient utilization is difficult to obtain due to the low grade of the output heat source.
The utility model has the following contents:
an object of the utility model is to overcome the not enough of prior art existence, provide a natural gas distributed energy system of coupling solar energy. The system uses the cascade utilization of energy as a principle, and generates medium-low temperature hot water through the solar heat collector to heat natural gas required by the gas turbine, so that low-grade heat energy enters high-temperature Brayton cycle, the application level of the medium-low temperature solar energy is improved, the heat load requirement of a user side terminal is met together with the waste heat utilization device, the advantage complementation of renewable energy and natural gas distributed energy is achieved, stable solar heat utilization is obtained, the consumption of fossil energy is reduced, and the economy of the distributed energy system is improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a natural gas distributed energy system coupled with solar energy comprises a gas turbine generator set, a waste heat utilization device, a solar heat collection system, a heat storage water tank, a hot water user, a steam user and a natural gas heater; wherein,
the natural gas inlet, the air inlet and the exhaust port are arranged on the gas turbine generator set, the natural gas inlet and the natural gas outlet are arranged on the natural gas heater, the outlet of the natural gas heater is connected to the natural gas inlet of the gas turbine generator set, the exhaust port of the gas turbine generator set is connected to the exhaust inlet of the waste heat utilization device, and the exhaust evacuation outlet is arranged on the waste heat utilization device;
a hot water circulating system is formed between the solar heat collecting system and the heat storage water tank, and a hot water circulating system is formed between the heat storage water tank and the natural gas heater and between the heat storage water tank and a hot water user; a hot water circulation system is formed between the hot water user and the waste heat utilization device, a hot water circulation system is formed between the waste heat utilization device and the natural gas heater, a steam outlet is formed in the waste heat utilization device, and the steam outlet is connected to the steam user.
The utility model discloses a further improvement lies in, gas turbine generating set is including the compressor, combustion chamber, gas turbine and the generator that connect gradually, wherein, is provided with air inlet on the compressor, is provided with the natural gas entry on the combustion chamber, is provided with the gas vent on the gas turbine, and gas turbine is used for driving the generator electricity generation.
The utility model discloses further improvement lies in, natural gas heater is including the first order natural gas heater and the second level natural gas heater that connect gradually, constitutes hot water circulating system between heat storage water tank and the first order natural gas heater, constitutes hot water circulating system between waste heat utilization equipment and the second level natural gas heater.
The utility model discloses further improvement lies in, and the waste heat utilization equipment is waste heat boiler or waste heat boiler and steam turbine generating set's combination.
The utility model discloses further improvement lies in, solar energy collection system adopts vacuum tube or flat plate type solar energy collection system.
The utility model discloses a further improvement lies in, is provided with first valve on the hot water circulating system pipeline of constituteing between heat storage water tank and the natural gas heater, is provided with second valve and third valve on the hot water circulating system pipeline of all constituteing between heat storage water tank and the hot water user, is provided with fourth valve and fifth valve on the hot water circulating system pipeline of constituteing between hot water user and the waste heat utilization device, is provided with the sixth valve on the hot water circulating system pipeline of constituteing between waste heat utilization device and the natural gas heater.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a distributed energy supply mode of solar energy, natural gas phase coupling utilizes the stable characteristics of natural gas distributed energy output, makes solar energy obtain the steady utilization, and it is poor to have solved independent solar energy supply system continuation, and the huge shortcoming of heat accumulation system.
The utility model discloses compare solitary natural gas distributed energy system, under the condition that obtains the same electricity, hot (cold) output to renewable energy supplies heat (cold), replaces partial fossil energy resource consumption, reaches energy saving and emission reduction's beneficial effect.
The utility model discloses a solar energy heating natural gas can reduce the consumption of natural gas heating unit fossil energy, if adopt GEPG6581B gas turbine and two regional type distributed energy system who presses non-reheat steam system, former natural gas heating unit adopts low pressure economizer export hot water to heat the natural gas to 125 ℃ for the heat medium from 25 ℃, when heating unit changes to be the heat source by solar energy, system generating efficiency can improve about 0.1 percentage point, utilize hour 5000 calculations according to the year, can practice thrift about 7 ten thousand sides of natural gas annually.
The utility model discloses the high temperature brayton cycle electricity generation of the preferential input gas turbine of low-grade heat energy that obtains solar energy collection system, in having improved, the application energy level of low temperature solar energy, the cross-class utilization of low temperature heat energy has been realized, distributed energy system's generating efficiency has been improved, if adopt GEPG6581B gas turbine and the regional type distributed energy system of two pressure non-reheat steam systems, usable solar energy heats the natural gas to 125 ℃ from 25 ℃, compare the operating mode that the natural gas temperature is 25 ℃, the system generating efficiency can improve 0.2 percentage point after the natural gas heating.
In summary, the utility model adopts the energy supply mode of coupling the solar energy and the natural gas phase, and utilizes the characteristic of stable output of the natural gas distributed energy, so that the solar energy is stably utilized, and the defects of poor continuity and huge heat storage system of an independent solar energy supply system are overcome; compared with a single natural gas distributed energy system, under the condition of obtaining the same electricity and heat (cold) output, renewable energy sources are used for supplying heat (cold) to replace part of fossil energy consumption; the medium-temperature and low-temperature solar energy is utilized in a cross-level mode on the basis of the energy cascade utilization, natural gas is heated through the solar energy, the energy consumption of a natural gas heating unit is reduced, and the power generation efficiency of a distributed energy system is improved; the utility model discloses a renewable energy and fossil energy's advantage complementary has the dual benefit of energy-conservation and environmental protection.
Description of the drawings:
fig. 1 is a block diagram of a natural gas distributed energy system coupled with solar energy according to the present invention.
In the figure: 1. a compressor; 2. a combustion chamber; 3. a gas turbine; 4. a waste heat utilization device; 5. a solar energy collection system; 6. a heat storage water tank; 7. a hot water user; 8. a steam user; 9. a first stage natural gas heater; 10. a second stage natural gas heater; 11. a generator; 101 to 106, first to sixth valves.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to the accompanying drawings and embodiments:
as shown in fig. 1, the utility model relates to a natural gas distributed energy system of coupling solar energy, include: the system comprises a gas turbine generator set, a waste heat utilization device 4, a solar heat collection system 5, a heat storage water tank 6, a hot water user 7, a steam user 8, a first-stage natural gas heater 9, a second-stage natural gas heater 10 and a valve 101, wherein the gas turbine generator set comprises a gas compressor 1, a combustion chamber 2, a gas turbine 3 and a generator 11 which are connected in sequence; wherein, the natural gas enters the combustion chamber 2 after passing through a first stage natural gas heater 9 and a second stage natural gas heater 10; air enters a combustion chamber 2 after passing through an air compressor 1, and the air and natural gas enter a gas turbine 3 after being combusted in the combustion chamber 2; the exhaust of the gas turbine 3 enters a waste heat utilization device 4, and the exhaust of the waste heat utilization device 4 enters the atmosphere; the solar heat collection system 5 generates hot water to enter the heat storage water tank 6, and the heat storage water tank 6 is connected with the first-stage natural gas heater 9. The hot water user 7 is connected with the waste heat utilization device 4 at least through a fourth valve 104 and a fifth valve 105; the hot water user 7 is connected with the hot water storage tank 6 at least through a second valve 102 and a third valve 103; the steam user 8 is connected with the waste heat utilization device 4; the second stage natural gas heater 10 is connected with the waste heat utilization device 4 through at least a sixth valve 106.
The waste heat utilization device 4 can be a waste heat boiler or a combination of the waste heat boiler and a steam turbine generator set.
The first stage natural gas heater 9 uses hot water generated by the solar heat collector as a heat source, and the second stage natural gas heater 10 uses hot water generated by the waste heat utilization device as a heat source. The natural gas is preferentially heated to the rated temperature in the first stage natural gas heater 9, and when the hot water generated by the solar heat collection system 5 is insufficient, the natural gas is heated to the rated temperature in the second stage natural gas heater 10 by adjusting the sixth valve 106.
The solar heat collection system 5 adopts a vacuum tube or flat plate type solar heat collection mode.
Solar energy has the good but poor characteristics of continuation of reproducibility, and the natural gas has the poor but good characteristics of continuation of reproducibility, the utility model discloses a renewable energy and fossil energy's advantage is complementary, has improved the application energy level of well, low temperature solar energy, makes solar energy obtain stable and high-efficient utilization, has reduced the natural gas heating unit energy consumption, has improved the thermal efficiency of natural gas distributed energy system, has energy-conserving and the dual benefit of environmental protection.
The working process of the utility model is as follows:
as shown in fig. 1, air passes through an air compressor 1 to form high-pressure air, the high-pressure air enters a combustion chamber 2, the high-temperature high-pressure air is generated after the high-pressure air and natural gas are combusted, the high-temperature high-pressure flue gas enters a gas turbine 3 to do work, and the gas turbine 3 drives a generator 11 to generate electricity. And then, the flue gas enters a waste heat utilization device 4 for waste heat utilization, and is discharged into the atmosphere after being cooled.
The water absorbs the flue gas waste heat in the waste heat utilization device 4, the generated hot water is respectively supplied to a hot water user 7 and a second-stage natural gas heater 10 through a fourth valve 104 and a sixth valve 106, and the generated steam is supplied to a steam user 8; the hot water is cooled by heat exchange in the hot water user 7 and the second-stage natural gas heater 10, and then returns to the waste heat utilization device 4.
The water absorbs solar heat energy in the solar heat collecting system 5 to form medium-low temperature hot water which enters the heat storage water tank 6, the hot water in the heat storage water tank 6 is divided into two paths after reaching a certain temperature, one path provides heat source water for the first-stage natural gas heater 9 through the first valve 101, and the other path provides heat source water for the hot water user 7 through the second valve 102; the hot water is cooled by heat exchange in the first-stage natural gas heater 9 and the hot water user 7, and then returns to the heat storage water tank 6.
The natural gas enters a first-stage natural gas heater 9 after passing through a pressure regulating station and a fine filter, the heat energy of the medium-low temperature hot water generated by a solar heat collecting system 5 is absorbed in the natural gas heater 9, the heated natural gas enters a second-stage natural gas heater 10, the heat energy of the hot water generated by a waste heat utilization device 4 is absorbed in the natural gas heater 10, and the heated natural gas enters a combustion chamber 2 after being heated to a rated temperature.
The heat demand for heating natural gas is ensured by two paths of heat sources, one path is from the waste heat utilization device 4, the other path is from the heat storage water tank 6, and the flow rates of the two paths of heat sources are respectively regulated through the opening degrees of the first valve 101 and the sixth valve 106; the operation principle is that the first valve 101 is opened preferentially to utilize the heat source water in the hot water storage tank 6, and the shortage is partially satisfied by opening the sixth valve 106.
The heat demand of the hot water user 7 is ensured by two paths of heat sources, one path is from the waste heat utilization device 4, the other path is from the heat storage water tank 6, and the flow rates of the two paths of heat sources are respectively regulated through the opening degrees of the fourth valve 104 and the second valve 102; the operation principle is that the fourth valve 104 is opened preferentially to utilize the hot water generated by the waste heat utilization device 4, and the shortage is partially satisfied by opening the second valve 102.

Claims (6)

1. A natural gas distributed energy system coupled with solar energy is characterized by comprising a gas turbine generator set, a waste heat utilization device (4), a solar heat collection system (5), a heat storage water tank (6), a hot water user (7), a steam user (8) and a natural gas heater; wherein,
a natural gas inlet, an air inlet and an exhaust port are arranged on the gas turbine generator set, a natural gas inlet and a natural gas outlet are arranged on the natural gas heater, an outlet of the natural gas heater is connected to the natural gas inlet of the gas turbine generator set, an exhaust port of the gas turbine generator set is connected to an exhaust inlet of the waste heat utilization device (4), and an exhaust evacuation outlet is arranged on the waste heat utilization device (4);
a hot water circulating system is formed between the solar heat collecting system (5) and the heat storage water tank (6), and a hot water circulating system is formed between the heat storage water tank (6) and the natural gas heater and between the heat storage water tank (6) and a hot water user (7); constitute hot water circulating system between hot water user (7) and waste heat utilization device (4), constitute hot water circulating system between waste heat utilization device (4) and the natural gas heater, and be provided with the steam outlet on waste heat utilization device (4), this steam outlet is connected to steam user (8).
2. The natural gas distributed energy system coupled with solar energy according to claim 1, wherein the gas turbine generator set comprises a compressor (1), a combustion chamber (2), a gas turbine (3) and a generator (11) which are connected in sequence, wherein an air inlet is formed in the compressor (1), a natural gas inlet is formed in the combustion chamber (2), an exhaust port is formed in the gas turbine (3), and the gas turbine (3) is used for driving the generator (11) to generate electricity.
3. The solar-coupled natural gas distributed energy system according to claim 1, wherein the natural gas heater comprises a first natural gas heater (9) and a second natural gas heater (10) which are connected in sequence, a hot water circulation system is formed between the heat storage water tank (6) and the first natural gas heater (9), and a hot water circulation system is formed between the waste heat utilization device (4) and the second natural gas heater (10).
4. The solar-coupled natural gas distributed energy system according to claim 1, wherein the waste heat utilization device (4) is a waste heat boiler or a combination of a waste heat boiler and a steam turbine generator set.
5. The natural gas distributed energy system for coupling solar energy according to claim 1, characterized in that the solar heat collecting system (5) adopts a vacuum tube or a flat plate type solar heat collecting system.
6. The solar-coupled natural gas distributed energy system according to claim 1, wherein a first valve (101) is arranged on a hot water circulation system pipeline formed between the heat storage water tank (6) and the natural gas heater, a second valve (102) and a third valve (103) are arranged on a hot water circulation system pipeline formed between the heat storage water tank (6) and the hot water user (7), a fourth valve (104) and a fifth valve (105) are arranged on a hot water circulation system pipeline formed between the hot water user (7) and the waste heat utilization device (4), and a sixth valve (106) is arranged on a hot water circulation system pipeline formed between the waste heat utilization device (4) and the natural gas heater.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105508158A (en) * 2015-12-28 2016-04-20 华能国际电力股份有限公司 Natural gas distributed energy system coupled with solar energy
CN108194201A (en) * 2017-12-06 2018-06-22 浙江中控太阳能技术有限公司 The afterheat utilizing system and its operation method of a kind of gas-turbine electric power plant
CN108591994A (en) * 2018-03-27 2018-09-28 中国能源建设集团广东省电力设计研究院有限公司 Starting trouble unit and Combined cycle gas-steam turbine unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105508158A (en) * 2015-12-28 2016-04-20 华能国际电力股份有限公司 Natural gas distributed energy system coupled with solar energy
CN105508158B (en) * 2015-12-28 2018-07-24 华能国际电力股份有限公司 Natural gas distributed energy system coupled with solar energy
CN108194201A (en) * 2017-12-06 2018-06-22 浙江中控太阳能技术有限公司 The afterheat utilizing system and its operation method of a kind of gas-turbine electric power plant
CN108194201B (en) * 2017-12-06 2020-03-31 浙江中控太阳能技术有限公司 Waste heat utilization system of gas turbine power plant and operation method thereof
CN108591994A (en) * 2018-03-27 2018-09-28 中国能源建设集团广东省电力设计研究院有限公司 Starting trouble unit and Combined cycle gas-steam turbine unit

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