CN103742269B - Energy-saving system for using natural gas depressurization cold energy in fuel gas power plant - Google Patents
Energy-saving system for using natural gas depressurization cold energy in fuel gas power plant Download PDFInfo
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- CN103742269B CN103742269B CN201410006067.6A CN201410006067A CN103742269B CN 103742269 B CN103742269 B CN 103742269B CN 201410006067 A CN201410006067 A CN 201410006067A CN 103742269 B CN103742269 B CN 103742269B
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Abstract
The invention discloses an energy-saving system for using natural gas depressurization cold energy in a fuel gas power plant, aiming at improving the thermal efficiency of the fuel gas power plant by making full use of the conversion of cold energy produced by natural gas depressurization and heat produced by rotating equipment. The system comprises a closed cooler, a closed cooler water supply pipeline, a closed cooler water return pipeline and a natural gas pipeline, wherein an outlet of the closed cooler is connected with the closed cooler water supply pipeline, and an inlet of the closed cooler is connected with the closed cooler water return pipeline. The energy-saving system is characterized in that one end of a first pipeline is connected with an outlet of a water bath furnace, and the other end of the first pipeline is connected with an inlet of a heat exchanger; one end of a second pipeline is connected to the closed cooler water return pipeline, and the other end of the second pipeline is connected with the inlet of the heat exchanger; one end of the third pipeline is connected with an outlet of the heat exchanger, and the other end of the third pipeline is connected to the closed cooler water supply pipeline; one end of a fourth pipeline is connected with the outlet of the heat exchanger, and the other end of the fourth pipeline is connected with an inlet of the water bath furnace.
Description
Technical field
The present invention relates to a kind of GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold and in particular to a kind of utilize combustion
The energy conserving system of the cold that the natural gas blood pressure lowering of dynamo-electric factory produces, the invention belongs to GTCC power plant heat-exchange system design field.
Background technology
Natural gas accesses the preposition module of combustion engine from outside point defeated station, need to be reduced pressure, and decompression can bring the decline of temperature.
Simultaneously in order to meet combustion engine run and improve combustion engine efficiency requirement, natural gas enter burner before need to be heated with
Improve temperature, typically adopt the modes such as water-bath stove heat, provide heating heat by outside.Change angle it is believed that natural gas
The such a concept of cold having.
Need to use closed water cooler in GTCC power plant subsidiary engine equipment（Abbreviation closed cold device）Main inclusion combustion engine and steamer
The hydrogen-cooled device of machine lube oil cooler, electromotor, feed pump cooler, air compressor machine etc., these equipment can distribute heat in run duration
Amount, needs cooling medium to take away heat.
It is respectively provided with independent closed cooling water system and heated by natural gas system in conventional GTCC power plant, fail fully
Using the heat of rotating machinery and the cold of natural gas.
Content of the invention
For solving the deficiencies in the prior art, it is an object of the invention to provide a kind of GTCC power plant utilizes natural gas blood pressure lowering cold
The energy conserving system of amount.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：
GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold, including closed cold device, closed cold device water supply line, closed cold device
Water return pipeline, natural gas line, the outlet of described closed cold device connects closed cold device water supply line, and the import of described closed cold device connects closes
Cooler water return pipeline is it is characterised in that also include：Be arranged on heat exchanger on natural gas line, the first pipeline, second pipe,
3rd pipeline, the 4th pipeline, one end of described first pipeline connects the outlet of water-bath stove, and the other end of described first pipeline connects
The import of heat exchanger；One end of described second pipe is connected on closed cold device water return pipeline, and the other end of described second pipe is even
Connect the import of heat exchanger；One end of described 3rd pipeline connects heat exchanger, and one end of described 3rd pipeline connects going out of heat exchanger
Mouthful, the other end of described 3rd pipeline is connected on closed cold device water supply line；One end of described 4th pipeline connects heat exchanger
Outlet, the other end of described 4th pipeline connects the import of water-bath stove.
Aforesaid GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that described closed cold device supplies water
First valve is provided with pipeline, described first valve is arranged between one end and the outlet of closed cold device of the 3rd pipeline.
Aforesaid GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that along described closed cold device
Water return pipeline is disposed with the second valve, the 3rd valve, enclosed pump, and described second valve is arranged on the import and of closed cold device
Between one end of two pipelines, one end of described second pipe be arranged on the second valve of closed cold device water return pipeline and the 3rd valve,
Between enclosed pump.
Aforesaid GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that on described first pipeline
It is provided with the 4th valve.
Aforesaid GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that on described second pipe
It is provided with the 5th valve.
Aforesaid GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that on described 3rd pipeline
It is provided with the 6th valve.
Aforesaid GTCC power plant using natural gas blood pressure lowering cold energy conserving system it is characterised in that also including the 5th pipeline,
The two ends of described 5th pipeline are both connected on the 3rd pipeline, and described 6th valve is arranged between the two ends of the 5th pipeline, institute
State and be provided with the 7th valve on the 5th pipeline.
Aforesaid GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that on described 4th pipeline
It is provided with the 8th valve.
The invention has benefit that：The GTCC power plant of the present invention can using the energy conserving system of natural gas blood pressure lowering cold
Make full use of the heat of rotating machinery and the cold of natural gas, phase can be calculated according to the actual demand of the hot and cold amount of electric power factory equipment
Close coupling amount, realize the reasonable transfer of GTCC power plant self-energy, improve the thermal efficiency of GTCC power plant.
Brief description
Fig. 1 is the structural representation being preferable to carry out of the present invention.
The implication of in figure reference：
1st, closed cold device, 2, closed cold device water supply line, 3, closed cold device water return pipeline, 4, the outlet of closed cold device, 5, closed cold device
Import, 6, heat exchanger, the 7, first pipeline, 8, second pipe, the 9, the 3rd pipeline, the 10, the 4th pipeline, 11, the import of heat exchanger,
12nd, the outlet of heat exchanger, the 13, first valve, the 14, second valve, the 15, the 3rd valve, 16, enclosed pump, the 17, the 4th valve, 18,
5th valve, the 19, the 6th valve, the 20, the 5th pipeline, the 21, the 7th valve, the 22, the 8th valve, 23, natural gas line.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is made with specific introduction.
With reference to shown in Fig. 1, GTCC power plant of the present invention utilizes the energy conserving system of natural gas blood pressure lowering cold, including closed cold device, closes
Cooler water supply line, closed cold device water return pipeline, natural gas line, the outlet of closed cold device connects closed cold device water supply line, closed cold device
Import connect closed cold device water return pipeline it is characterised in that also including：It is arranged on heat exchanger on natural gas line, first pipe
Road, second pipe, the 3rd pipeline, the 4th pipeline, one end of the first pipeline connects the outlet of water-bath stove, the other end of the first pipeline
Connect the import of heat exchanger；One end of second pipe is connected on closed cold device water return pipeline, and the other end connection of second pipe is changed
The import of hot device；One end of 3rd pipeline connects heat exchanger, and one end of the 3rd pipeline connects the outlet of heat exchanger, the 3rd pipeline
The other end is connected on closed cold device water supply line；One end of 4th pipeline connects the outlet of heat exchanger, the other end of the 4th pipeline
Connect the import of water-bath stove.During actual motion, the outlet that closed cold device passes through closed cold device provides cold water to closed cold device water supply line, so
Closed cold device water supply line is to combustion engine and the hydrogen-cooled device of steam-turbine lubrication oil cooler, electromotor, feed pump cooler, air compressor machine etc. afterwards
There is provided cold water cooling, then the cold water in closed cold device water supply line just absorbs combustion engine and steam-turbine lubrication oil cooler, generating
The heat of the generations such as the hydrogen-cooled device of machine, feed pump cooler, air compressor machine, becomes hot water and by closed cold device water return pipeline through closed cold device
Import returns closed cold device.This is the work process of existing closed cooling water system.Additionally, in terms of natural gas line, water-bath
Hot water is discharged in the outlet of stove, and the heat in transmission hot water after the first pipeline, the import of heat exchanger is to natural gas so that natural
Temperature degree raises, and hot water just becomes cold water and through the 4th pipeline, the import of water-bath stove and return water liquid furnace.This is existing sky
So construction of gas heating system.The innovation of the present invention is, by the hot water in closed cold device water return pipeline by second pipe, change
Hot device passes to natural gas so that natural gas heats up, and so, the heat in hot water in closed cold device water return pipeline just transmits and gives
Natural gas, and the cold of natural gas returns in closed cold device water supply line simultaneously also by the outlet of heat exchanger, the 3rd pipeline, now
Water in 3rd pipeline is cold water, and its cold is provided by natural gas, can give combustion engine and steam-turbine lubrication oil cooler, electromotor
Hydrogen-cooled device, feed pump cooler, air compressor machine etc. provide cold.Thus, the GTCC power plant of the present invention utilizes natural gas blood pressure lowering cold
Energy conserving system can make full use of the heat of rotating machinery and the cold of natural gas, can be according to the hot and cold amount of electric power factory equipment
Actual demand, calculates correlative coupling amount, realizes the reasonable transfer of GTCC power plant self-energy, improves the thermal efficiency of GTCC power plant.
Further, so that the present invention can more automatization, closed cold device water supply line is provided with the first valve with
Control the output of closed cold device water supply line, the first valve is arranged between one end and the outlet of closed cold device of the 3rd pipeline；Edge
Closed cold device water return pipeline be disposed with for controlling the second valve of the water yield returning to closed cold device, for controlling from combustion engine and
3rd valve of the hot water amount that the hydrogen-cooled device of steam-turbine lubrication oil cooler, electromotor, feed pump cooler, air compressor machine etc. are taken back and
Enclosed pump, the second valve is arranged between the import of closed cold device and one end of second pipe, and one end of second pipe is arranged on to be closed
Between second valve of cooler water return pipeline and the 3rd valve, enclosed pump；It is provided with first pipeline for controlling from water-bath stove
4th valve of the hot water amount obtaining；It is provided with second pipe for controlling the of the water yield obtaining from closed cold device water return pipeline
Five valves；The 6th valve controlling the cool water quantity providing to closed cold device water supply line is provided with the 3rd pipeline；Also include the 5th
Pipeline, the two ends of the 5th pipeline are both connected on the 3rd pipeline, and the 6th valve is arranged between the two ends of the 5th pipeline, the 5th pipe
7th valve is provided with road, the 5th pipeline and the 6th pipeline are used for cooperating with the 6th valve, enabling more effectively
The cool water quantity providing to closed cold device water supply line is provided；The 8th valve for returning cold water to water-bath stove is provided with the 4th pipeline
Door.
Below, taking the power plant of Liang Tao Siemens F level combustion engine as a example, calculate each typical case's season operating mode and divide into standby hot and cold heat exchange
Amount data, calculates correlative coupling amount, proposes additional project when the two mismatches.
Natural gas side：
Taking the power plant of Liang Tao Siemens F level combustion engine as a example, its combustion engine is 15～50 DEG C for the temperature requirement of natural gas, and
It need to be higher than 28 DEG C of gas dew point.For fuel for west_east gas transmission pipeline power plant, point defeated station receives atmospheric pressure and maintains throughout the year
6MPa about, about 10～15 DEG C of temperature, through being decompressed to pressure about 4MPa at voltage regulating station of power plant, about 0～5 DEG C of temperature, natural gas reveals
About -10 DEG C of point.According to point defeated station come natural gas situation, final combustion engine entrance natural gas temperature scope should be between 18～50 DEG C.
Cause enters factory's natural gas temperature and flow was slightly changed with season, is analyzed according to above, and calculating natural gas respectively can carry
For cold related data such as following table one：
Table one：The available cold of natural gas
Closed-up water side：
Need in subsidiary engine equipment cool down main inclusion combustion engine and the hydrogen-cooled device of steam-turbine lubrication oil cooler, electromotor, to
Water pump cooler, air compressor machine etc., these equipment can distribute heat in run duration, needs cooling medium to take away heat.With two
The component cooling water amount statistics of the power plant of set Siemens F level combustion engine refers to following table two.
Table two：The component cooling water amount of the power plant of Liang Tao Siemens F level combustion engine
Equally point season calculates the heat such as following table three that cooling water side need to be taken away：
Table three：Divide the heat that the cooling water side of season calculating need to be taken away
Calculate the working condition of heat exchanger below according to season, successively as shown in following table four, table five, table six：
Table four：Heat exchanger spring operating mode
Table five：Heat exchanger summer condition
Table six：Heat exchanger autumn operating mode
Can tentatively draw to draw a conclusion from above computational chart：
1st, in power plant's major part run time（Enclosed coolant-temperature gage is higher than 22 DEG C）：
For natural gas：The heat that closed-up water is provided that is much larger than the heat needed for heated by natural gas it is only necessary to introduce about
20% closed-up water can meet the requirement of heated by natural gas；
For closed-up water：The heat that the cold that natural gas is provided that need to be taken away less than closed-up water side, other heats need to still be adopted
Taken away with outer loop water.
2nd, when enclosed coolant-temperature gage is less than 22 DEG C
Consider 5 DEG C about of heat transmission equipment end after the recovery, when in the winter time, closed-up water is difficult to heated by natural gas to required temperature
Degree.Now it is considered as using water-bath stove etc. as heat source, to replace closed-up water heated natural gas.
When enclosed coolant-temperature gage is higher than 22 DEG C, water-bath stove heat natural gas, the natural gas of calculated savings are replaced with closed-up water
Consumption is as follows（Water-bath stove power presses 2000kW, natural gas low heat valve 33812kJ/m3, natural gas 3.3 yuan/m3 of unit price, often
Year hours run calculating in 2000 hours）：
Natural gas consumption=water-bath stove power/natural gas low heat valve × 3600=213m3/h
Saving fuel cost=natural gas consumption × natural gas unit price=140.5 ten thousand yuan
Simultaneously as the minimizing of the enclosed water yield that need to cool down, the outer loop water yield accordingly also can reduce, the benefit of this part
Also can increased.
The basic principles, principal features and advantages of the present invention have been shown and described above.The technical staff of the industry should
Understand, the invention is not limited in any way for above-described embodiment, all obtained by the way of equivalent or equivalent transformation
Technical scheme, all falls within protection scope of the present invention.
Claims (6)
1. GTCC power plant utilizes the energy conserving system of natural gas blood pressure lowering cold, returns including closed cold device, closed cold device water supply line, closed cold device
Waterpipe, natural gas line, the outlet of described closed cold device connects closed cold device water supply line, the import of described closed cold device connect close cold
Device water return pipeline is it is characterised in that also include：Be arranged on heat exchanger on natural gas line, the first pipeline, second pipe,
Three pipelines, the 4th pipeline, one end of described first pipeline connects the outlet of water-bath stove, and the other end connection of described first pipeline is changed
The import of hot device；One end of described second pipe is connected on closed cold device water return pipeline, and the other end of described second pipe connects
The import of heat exchanger；One end of described 3rd pipeline connects heat exchanger, and one end of described 3rd pipeline connects the outlet of heat exchanger,
The other end of described 3rd pipeline is connected on closed cold device water supply line；One end of described 4th pipeline connects going out of heat exchanger
Mouthful, the other end of described 4th pipeline connects the import of water-bath stove；First valve, institute are provided with described closed cold device water supply line
State between one end and the outlet of closed cold device that the first valve is arranged on the 3rd pipeline；Set successively along described closed cold device water return pipeline
Be equipped with the second valve, the 3rd valve, enclosed pump, described second valve be arranged on the import of closed cold device and second pipe one end it
Between, one end of described second pipe is arranged between the second valve of closed cold device water return pipeline and the 3rd valve.
2. GTCC power plant according to claim 1 utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that described
4th valve is provided with the first pipeline.
3. GTCC power plant according to claim 2 utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that described
5th valve is provided with second pipe.
4. GTCC power plant according to claim 3 utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that described
It is provided with the 6th valve on 3rd pipeline.
5. GTCC power plant according to claim 4 using the energy conserving system of natural gas blood pressure lowering cold it is characterised in that also wrapping
Include the 5th pipeline, the two ends of described 5th pipeline are both connected on the 3rd pipeline, and described 6th valve is arranged on the 5th pipeline
Between two ends, described 5th pipeline is provided with the 7th valve.
6. GTCC power plant according to claim 5 utilizes the energy conserving system of natural gas blood pressure lowering cold it is characterised in that described
It is provided with the 8th valve on 4th pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410006067.6A CN103742269B (en) | 2014-01-07 | 2014-01-07 | Energy-saving system for using natural gas depressurization cold energy in fuel gas power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410006067.6A CN103742269B (en) | 2014-01-07 | 2014-01-07 | Energy-saving system for using natural gas depressurization cold energy in fuel gas power plant |
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| CN103742269A CN103742269A (en) | 2014-04-23 |
| CN103742269B true CN103742269B (en) | 2017-02-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949544A (en) * | 1988-12-06 | 1990-08-21 | General Electric Company | Series intercooler |
| CN1737351A (en) * | 2005-09-01 | 2006-02-22 | 西安交通大学 | System and method for improving efficiency of combined cycle electric power plant |
| DE102012210702A1 (en) * | 2012-06-25 | 2014-01-02 | Siemens Aktiengesellschaft | Method for preheating fuel to be combusted in gas turbine, involves heating fuel by heat exchange with lubricant of gas turbine before injecting fuel into combustion chamber, where fuel flows through heat exchanger on secondary side |
| CN203685396U (en) * | 2014-01-07 | 2014-07-02 | 江苏省电力设计院 | Energy-saving system capable of utilizing cooling capacity generated by depressurization of natural gas of fuel gas power plant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013170915A2 (en) * | 2012-05-14 | 2013-11-21 | Siemens Aktiengesellschaft | Use of the waste heat of a machine transformer for pre-heating natural gas to counter the joule-thomson effect |
-
2014
- 2014-01-07 CN CN201410006067.6A patent/CN103742269B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4949544A (en) * | 1988-12-06 | 1990-08-21 | General Electric Company | Series intercooler |
| CN1737351A (en) * | 2005-09-01 | 2006-02-22 | 西安交通大学 | System and method for improving efficiency of combined cycle electric power plant |
| DE102012210702A1 (en) * | 2012-06-25 | 2014-01-02 | Siemens Aktiengesellschaft | Method for preheating fuel to be combusted in gas turbine, involves heating fuel by heat exchange with lubricant of gas turbine before injecting fuel into combustion chamber, where fuel flows through heat exchanger on secondary side |
| CN203685396U (en) * | 2014-01-07 | 2014-07-02 | 江苏省电力设计院 | Energy-saving system capable of utilizing cooling capacity generated by depressurization of natural gas of fuel gas power plant |
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| CN103742269A (en) | 2014-04-23 |
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Address after: 210009 Gulou District, Jiangsu, Nanjing new model road, No. 5 Applicant after: Chinese energy construction group Jiangsu Prov. Power Design Inst Co., Ltd Address before: No. 5, new model street, Gulou District, Jiangsu, Nanjing Applicant before: Jiangsu Electric Power Designing Institute |
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Free format text: CORRECT: ADDRESS; FROM: NANJING, JIANGSU PROVINCE TO: 210009 NANJING, JIANGSU PROVINCE Free format text: CORRECT: APPLICANT; FROM: JIANGSU ELECTRIC POWER DESIGNING INST. TO: CHINA ENERGY ENGINEERING GROUP JIANGSU ELECTRIC POWER DESIGN INSTITUTE CO., LTD. |
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