CN102383870A - Natural gas pressure difference generating system self-adaptive to back-end load change - Google Patents
Natural gas pressure difference generating system self-adaptive to back-end load change Download PDFInfo
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- CN102383870A CN102383870A CN2011103654969A CN201110365496A CN102383870A CN 102383870 A CN102383870 A CN 102383870A CN 2011103654969 A CN2011103654969 A CN 2011103654969A CN 201110365496 A CN201110365496 A CN 201110365496A CN 102383870 A CN102383870 A CN 102383870A
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Abstract
The invention discloses a natural gas pressure difference generating system self-adaptive to the back-end load change, and the natural gas pressure difference generating system self-adaptive to the back-end load change comprises the natural gas pressure difference generating system and a load automatic bypass pressure decreasing and pressure stabilizing system, wherein the natural gas pressure difference generating system mainly comprises: a single-stage or a multistage centripetal turbine expansion machine set, the front-end preheater of the expansion machine set, the interstage middle reheater of the expansion machine set, a speed reducer, a generator set and the like. The system to which the invention relates is mainly characterized in that one set of the load automatic bypass pressure decreasing and pressure stabilizing system is arranged near the natural gas pressure difference generating system and synchronously runs together with the natural gas pressure difference generating system, and the amount of natural gas entering a back-end pipe network is regulated by utilizing the load automatic bypass pressure decreasing and pressure stabilizing system, so as to solve the problem that a natural gas expansion machine set is difficult to meet the load change, and greatly promote the stability and the adaptability of the whole natural gas pressure difference generating system. Moreover, a pressure stabilizing valve can be added at the back end of the natural gas pressure difference generating system, and a natural gas pressure stabilizing tank can be added at the tail end of the system, so that the natural gas pressure of the back-end pipe network can be further stabilized, the stability of the natural gas pressure difference generating system is promoted again, and the adaptability of the natural gas pressure difference generating system is increased.
Description
Technical field
The present invention relates to waste heat top pressure power generation technical field.
Background technique
Rock gas has elevated pressures after being gone out by underground mining, arrives between tens of MPa at number MPa usually.The long distances of rock gas also is to adopt the above high pressure pipe line of 4MPa to carry; Get into urban pipe network or large-scale during with gas enterprise pipe network; Usually can gas pressure be reduced to middle pressure (about 0.4MPa) through voltage regulating station; The step-down process of rock gas voltage regulating station generally adopts expenditure and pressure, and at present, this part pressure difference energy is not utilized well.
Utilize the pressure reduction of rock gas voltage regulating station to generate electricity, this be China's gas industry discussion for many years, a but problem that is not resolved, its difficulty mainly is:
1, the fluctuation of load of voltage regulating station gas discharge is bigger, and General System is difficult to adapt to;
2, the expansion step-down process temperature that is accompanied by tens of degree even attendes Baidu is fallen, and the rear end natural gas temperature is low excessively to cause the inconvenience of carrying and using;
3, the generating efficiency of system is not high, and cost and benefit can not get good balance.
But the market of rock gas pressure reduction generating is very big, and almost each city all has one to dozens of, even hundreds of high pressure are to the voltage regulating station of middle pressure.Therefore, research and develop a kind of reliable, rock gas pressure reduction electricity generating device that generating efficiency is high, be very important.
Summary of the invention
The objective of the invention is to deficiency to the existing technology existence; The rock gas pressure reduction power generation system that a kind of self adaption back-end load changes is proposed; Utilize rock gas pressure reduction to generate electricity; Solve the big problem of fluctuation of load of voltage regulating station gas discharge, promote reliability, stability and the adaptability of whole generating system significantly.
Technological scheme of the present invention is following:
The rock gas pressure reduction power generation system that a kind of self adaption back-end load changes, it comprises load auto by pass lowering and stabilizing blood pressure system and rock gas pressure reduction power generation system.Wherein, said rock gas pressure reduction power generation system connects gas distributing system (by its depressurized system), comprises preheater, reheater, single-stage or multistage centripetal turbine expansion unit, retarder and generator set; The air inlet termination rock gas of said preheater, the inlet end of outlet side order level or multistage centripetal turbine expansion unit, the pto connection reducer of single-stage or multistage centripetal turbine expansion unit, retarder connects generator set again.
Further; Can also be by said rock gas pressure reduction power generation system; Be in parallel installed with a cover load auto by pass lowering and stabilizing blood pressure system; Move during with rock gas pressure reduction power generation system same, said load auto by pass lowering and stabilizing blood pressure system is the voltage regulating station of gas distributing system self, or automatic pressure reducing valve group or decompression stable-pressure device.Like this, through the mode of load auto by pass lowering and stabilizing blood pressure system and the parallel running of rock gas pressure reduction power generation system, make whole system well adapt to the variation of rear end rock gas load.
Further, the single-stage of said rock gas pressure reduction power generation system or multistage centripetal turbine expansion unit all can be connected in series reheater (as carrying out resuperheat between one section expansion of expansion unit, two sections expansions, three sections expansions) between every grade in carrying out the multistage expansion process.Like this, through repeatedly preheating and heat again,, promote generating efficiency significantly through increasing the enthalpy drop of unit.
In addition, behind the outlet side of said rock gas pressure reduction power generation system, but on the outlet pipe before load auto by pass lowering and stabilizing blood pressure system and the merging of rock gas pressure reduction power generation system, can connect a pressure maintaining valve.
Further; In the single-stage of said rock gas pressure reduction power generation system or the outlet side of multistage centripetal turbine expansion unit; Or the outlet side of load auto by pass lowering and stabilizing blood pressure system; Or can be connected a surge tank on the outlet pipe after load auto by pass lowering and stabilizing blood pressure system and the merging of rock gas pressure reduction power generation system, make supply gas pressure more stable.
The invention has the advantages that:
1, adopts multistage centripetal turbine expansion unit as power equipment, reduce the speed ratio of rotating speed and retarder as far as possible, increase system reliability;
2, in expansion system, design preheating, reheat machine make full use of preheating, hot to improve system's generating efficiency again, have also improved the temperature of rear end rock gas simultaneously, a solution natural gas transport and an awkward difficult problem;
3, adopt rock gas load auto by pass lowering and stabilizing blood pressure system, adapt to the fluctuation of rock gas load;
4, increase stable-pressure device, further stable system output gas pressure.
Description of drawings
Fig. 1 changes the system diagram of rock gas pressure reduction generating for the self adaption back-end load.
Fig. 2 is the system diagram of rock gas expansion power generation unit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the rock gas pressure reduction power generation system that self adaption back-end load provided by the invention changes is elaborated.
Like Fig. 1, shown in Figure 2, this rock gas pressure reduction power generation system is made up of rock gas load auto by pass lowering and stabilizing blood pressure system 1, rock gas pressure reduction power generation system 2, pressure maintaining valve 3 and surge tank 4 etc.
As shown in Figure 2, rock gas pressure reduction power generation system 2 mainly comprises front end preheater 5, resuperheater 6, multistage centripetal turbine expansion unit 7, retarder 11 and generator set 12.The air inlet termination rock gas of said preheater 5, the inlet end of outlet side order level or multistage centripetal turbine expansion unit 7, the pto connection reducer 11 of multistage centripetal turbine expansion unit 7, retarder 11 connects generator set 12 again.All can be connected in series reheater 6 between carry out in the multistage expansion process at the multistage centripetal turbine expansion unit 7 of rock gas pressure reduction power generation system 2 every grade.
Referring to Fig. 1; Other in rock gas pressure reduction power generation system 2; Be in parallel installed with a cover load auto by pass lowering and stabilizing blood pressure system 1; Move simultaneously with rock gas pressure reduction power generation system 2, load auto by pass lowering and stabilizing blood pressure system 1 is the voltage regulating station of gas distributing system self, or automatic pressure reducing valve group or decompression stable-pressure device.On the outlet pipe after load auto by pass lowering and stabilizing blood pressure system 1 and 2 merging of rock gas pressure reduction power generation system, can be connected surge tank 4.Behind the outlet side of said rock gas pressure reduction power generation system 2, but on the pipeline before load auto by pass lowering and stabilizing blood pressure system 1 merges with rock gas pressure reduction power generation system 2, can connect pressure maintaining valve 3.
Working method: system is according to rear end rock gas load condition; Part rock gas at first gets into rock gas pressure reduction power generation system 2 and carries out one or more snippets expansion; Drive generator set 12 generatings through retarder 11; Can carry out voltage stabilizing once more through the pressure maintaining valve 3 that increases in rock gas pressure reduction power generation system 2 rear ends; Another part rock gas then gets into load auto by pass lowering and stabilizing blood pressure system, according to the variation of rear end rock gas load, supplies rock gas automatically, to satisfy the demand of rear end rock gas.Be connected surge tank 4 on the pipeline after load auto by pass lowering and stabilizing blood pressure system 1 and 2 merging of rock gas pressure reduction power generation system, rock gas can get into surge tank 4 once more, supplies with the downstream pipe network at last.
And rock gas gets into before single-stage or multistage centripetal turbine expansion unit 7 expand; Can carry out front end preheating 5 earlier, can also carry out all carrying out between every grade in the multistage expansion process again heat (can carry out reheater 6 between 9, the three sections expansions 10 of 8, two sections expansions of one section expansion like the expansion unit) at the expansion unit.Like this, the enthalpy drop through unit significantly increases, and promotes generating efficiency significantly, and can promote the temperature of the back rock gas that expands, and has well solved low excessively conveying and the awkward problem of bringing of rock gas Yin Wendu after expanding.
Like this, through repeatedly preheating and heat again,, greatly promoted generating efficiency through increasing the enthalpy drop of unit.And owing to increased load auto by pass lowering and stabilizing blood pressure system 1 and pressure maintaining valve 3 and surge tank 4, well solved the big problem of fluctuation of load of voltage regulating station gas discharge, promoted the reliability and the stability of whole generating system significantly.
Claims (5)
1. the rock gas pressure reduction power generation system that changes of a self adaption back-end load, it is characterized in that: it comprises load auto by pass lowering and stabilizing blood pressure system (1) and rock gas pressure reduction power generation system (2);
Wherein, said rock gas pressure reduction power generation system (2) connects gas distributing system, comprises preheater (5), single-stage or multistage centripetal turbine expansion unit (7), retarder (11) and generator set (12); The air inlet termination rock gas of said preheater (5); The inlet end of outlet side order level or multistage centripetal turbine expansion unit (7); The pto connection reducer (11) of single-stage or multistage centripetal turbine expansion unit (7), retarder (11) connects generator set (12) again.
2. the rock gas pressure reduction power generation system that self adaption back-end load according to claim 1 changes; It is characterized in that; In the other cover load auto by pass lowering and stabilizing blood pressure system (1) that is in parallel installed with of said rock gas pressure reduction power generation system (2); Move simultaneously with rock gas pressure reduction power generation system (2), said load auto by pass lowering and stabilizing blood pressure system (1) is the voltage regulating station of gas distributing system self, or automatic pressure reducing valve group or decompression stable-pressure device.
3. the rock gas pressure reduction power generation system that self adaption back-end load according to claim 1 changes; It is characterized in that the single-stage of said rock gas pressure reduction power generation system (2) or multistage centripetal turbine expansion unit (7) are connected in series reheater (6) between every grade of expansion.
4. the rock gas pressure reduction power generation system that self adaption back-end load according to claim 1 changes; It is characterized in that; Behind the outlet side of said rock gas pressure reduction power generation system (2); But on the outlet pipe before load auto by pass lowering and stabilizing blood pressure system (1) and rock gas pressure reduction power generation system (2) merging, connect pressure maintaining valve (3).
5. the rock gas pressure reduction power generation system that self adaption back-end load according to claim 1 changes; It is characterized in that; In the single-stage of said rock gas pressure reduction power generation system (2) or the outlet side of multistage centripetal turbine expansion unit (7); Or the outlet side of load auto by pass lowering and stabilizing blood pressure system (1), or be connected surge tank (4) on the outlet pipe after load auto by pass lowering and stabilizing blood pressure system (1) and rock gas pressure reduction power generation system (2) merging.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104812A (en) * | 2013-01-29 | 2013-05-15 | 深圳智慧能源技术有限公司 | Pipeline gas transmission station gas processing system |
| CN105471060A (en) * | 2015-12-29 | 2016-04-06 | 重庆科技学院 | Power generation system for natural gas well station field gathering pipeline pressure complementary energy |
| CN107882604A (en) * | 2017-12-07 | 2018-04-06 | 刘强 | Pressure energy reclaimer and pipeline pressure energy recovery system |
| CN109506130A (en) * | 2018-12-28 | 2019-03-22 | 动能（北京）科技发展有限公司 | The energy recycle device and power generator of pressure difference energy when based on natural gas well gas production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103104812A (en) * | 2013-01-29 | 2013-05-15 | 深圳智慧能源技术有限公司 | Pipeline gas transmission station gas processing system |
| CN105471060A (en) * | 2015-12-29 | 2016-04-06 | 重庆科技学院 | Power generation system for natural gas well station field gathering pipeline pressure complementary energy |
| CN107882604A (en) * | 2017-12-07 | 2018-04-06 | 刘强 | Pressure energy reclaimer and pipeline pressure energy recovery system |
| CN109506130A (en) * | 2018-12-28 | 2019-03-22 | 动能（北京）科技发展有限公司 | The energy recycle device and power generator of pressure difference energy when based on natural gas well gas production |
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Application publication date: 20120321 |