CN104879178A - Method and system for generating power through high-pressure cryogenic fluid, recycling low-grade waste heat and cooling compressor inlet gas - Google Patents
Method and system for generating power through high-pressure cryogenic fluid, recycling low-grade waste heat and cooling compressor inlet gas Download PDFInfo
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- CN104879178A CN104879178A CN201510273522.3A CN201510273522A CN104879178A CN 104879178 A CN104879178 A CN 104879178A CN 201510273522 A CN201510273522 A CN 201510273522A CN 104879178 A CN104879178 A CN 104879178A
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- Y—GENERAL 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
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Abstract
The invention relates to a method and system for generating power through high-pressure cryogenic fluid, recycling low-grade waste heat and cooling compressor inlet gas. High-pressure cryogenic fluid energy can be effectively utilized to generate power, and the power consumption of a compressor is further remarkably reduced by recycling the low-grade waste heat and cooling the compressor inlet gas at the same time. The method includes the expansion power generation process, the low-grade waste heat recycling process and the compressor inlet gas cooling process. An expander of the system is connected with a power generating device, the power generating device is connected with a power output device, and a cooling heat exchanger, a pre-heating heat exchanger and a pump are sequentially arranged in a cooling loop. Fluid in the cooling heat exchanger and fluid in the pre-heating heat exchanger exchange heat, the fluid in the cooling heat exchanger transmits heat to the fluid in the pre-heating heat exchanger, and the pre-heating heat exchanger of a heat exchange mechanism is connected with the expander of an expansion power generation mechanism.
Description
Technical field
The present invention relates to a kind of method and system utilizing high pressure cryogenic fluid generating and reclaim low-grade exhaust heat and cooling compressor inlet gas.
Background technique
At iron and steel, a lot of high pressure cryogenic fluid (gas is had in Petroleum & Petrochemical Enterprises and industrial park, liquid) source, as the nitrogen etc. that air separation oxygenerator is discharged, these high-temperature low-pressure fluid source majorities do not utilize and are typically piped directly in environment now, cause very large energy loss, in these enterprises and industrial park, have the energy demand recovery in a large amount of low-grade exhaust heat source (temperature < 150 DEG C) and the intake requirement high efficiency cooling of gas compressor simultaneously.
Reclaim the thing that low-grade exhaust heat energy is part difficulty, normally use organic Rankine bottoming cycle (ORC, Organic Rankine Cycle) change low-grade exhaust heat energy to electric energy or refrigeration, if the patent No. is 201420082166.8, name is called a kind of Chinese patent of non-constant used heat twin-stage organic Rankine cycle power generation system.But the initial outlay of organic Rankine bottoming cycle equipment very high (about 15000 yuan/kwh), present stage is difficult to apply.Such low-grade exhaust heat is directly discharged to environment and causes a large amount of energy dissipation also can cause serious thermo-pollution.
During gas compressor pressurized gas, as from air oxygen preparation, the power consumption of the every one-level of air compressor when pressure ratio is certain with import PTAT; As inlet temperature reduces by 10%, then energy consumption reduces by 10%.This is that any pneumatic design is improved, driven compressor system optimization is all difficult to realize.Conventional multistage industrial compressors level final vacuum temperature is generally about 90 DEG C, in order to the energy consumption reducing next stage generally adopts cascade EDFA system.Existing cooling system adopts the water with ambient temperature that upper level delivery temperature is reduced to ambient temperature, and then cooled gas enters into next stage, is further compressed.
In summary it can be seen also do not exist in prior art and reclaim the method and system that low-grade exhaust heat and cooling compressor inlet gas are reclaimed in the generating of high pressure cryogenic fluid energy simultaneously.
Summary of the invention
The object of the invention is to overcome above shortcomings in prior art, and a kind of method and system utilizing high pressure cryogenic fluid generating and reclaim low-grade exhaust heat and cooling compressor inlet gas is provided, can effectively utilize high pressure cryogenic fluid energy to generate electricity, recovery low-grade exhaust heat and cooling compressor inlet gas significantly reduce the power consumption of compressor further simultaneously.
The present invention's adopted technological scheme that solves the problem is: a kind ofly utilize high pressure cryogenic fluid to generate electricity and reclaim the method for low-grade exhaust heat and cooling compressor inlet gas, it is characterized in that: comprise expansion power generation process, reclaim low-grade exhaust heat process and cooling compressor inlet gas process; A, expansion power generation process are: high pressure cryogenic fluid is sent into decompressor, and after decompressor acting, can be converted to rotating mechanical energy in fluid, then electricity generating device utilizes this rotating mechanical energy to generate electricity, then exports through electric power output apparatus;
B, recovery low-grade exhaust heat process are: low-grade exhaust heat is sent into cooling heat exchanger, low-grade exhaust heat in cooling heat exchanger and the high pressure low temperature gas converting heat in preheating heat exchanger, the low-grade exhaust heat in cooling heat exchanger passes to heat the high pressure low temperature gas in preheating heat exchanger; This high pressure cryogenic fluid is the high pressure cryogenic fluid in expansion power generation process;
C, cooling compressor inlet gas process are: compressor inlet gas is sent into cooling heat exchanger, compressor inlet gas in cooling heat exchanger and the high pressure low temperature gas converting heat in preheating heat exchanger, the compressor inlet gas in cooling heat exchanger passes to heat the high pressure low temperature gas in preheating heat exchanger; This high pressure cryogenic fluid is the high pressure cryogenic fluid in expansion power generation process;
Wherein, reclaim low-grade exhaust heat process and/or cooling compressor inlet gas process and expansion power generation process to carry out simultaneously.
The present invention reclaims low-grade exhaust heat process and expansion power generation process when carrying out simultaneously, and low-grade exhaust heat enters cooling heat exchanger and participates in heat exchange, and high pressure cryogenic fluid enters preheating heat exchanger and participates in heat exchange; High pressure cryogenic fluid is sent into decompressor after being preheated heat exchanger heating and is generated electricity.
When cooling compressor inlet fluid process of the present invention and expansion power generation process are carried out simultaneously, compressor inlet gas enters cooling heat exchanger and participates in heat exchange, and high pressure cryogenic fluid enters preheating heat exchanger and participates in heat exchange; High pressure cryogenic fluid is sent into decompressor after being preheated heat exchanger heating and is carried out generating electricity or become low normal pressure and temperature fluid drainage and go out.
The present invention reclaims low-grade exhaust heat process and cooling compressor inlet gas process and expansion power generation process when carrying out simultaneously, low-grade exhaust heat enters one-level cooling heat exchanger, high pressure cryogenic fluid enters one-level preheating heat exchanger, this grade of cooling heat exchanger and this grade of preheating heat exchanger carry out heat exchange, and high pressure cryogenic fluid is sent into decompressor after being preheated heat exchanger heating and generated electricity; Compressor inlet gas enters another grade of cooling heat exchanger, high pressure cryogenic fluid after generating enters another grade of preheating heat exchanger, this grade of cooling heat exchanger and this grade of preheating heat exchanger carry out heat exchange, and high pressure cryogenic fluid is sent into decompressor and carried out generating electricity or become low pressure gas at normal temperature and emit after being preheated heat exchanger heating.
Utilize high pressure cryogenic fluid to generate electricity and reclaim a system for low-grade exhaust heat and cooling compressor inlet gas, it is characterized in that: comprise expansion power generation mechanism and heat exchange mechanisms;
Expansion power generation mechanism comprises decompressor, electricity generating device and electric power output apparatus; Decompressor is connected with electricity generating device; Electricity generating device is connected with electric power output apparatus; When expansion power generation mechanism is more than two-stage, these expansion power generation mechanisms connect successively according to before and after the flow direction of high pressure cryogenic fluid, and the fluid output of previous stage expansion power generation mechanism decompressor is communicated with the fluid input of rear stage expansion power generation mechanism decompressor;
Heat exchange mechanisms comprises cooling heat exchanger, preheating heat exchanger, pump and cooling loop; Cooling heat exchanger, preheating heat exchanger, pump are successively set in cooling loop; Fluid in cooling heat exchanger and the fluid heat transfer in cooling loop, fluid in cooling loop and the fluid heat transfer in preheating heat exchanger, make the fluid in cooling heat exchanger and the fluid heat transfer in preheating heat exchanger, the fluid in cooling heat exchanger passes to heat the fluid in preheating heat exchanger; When heat exchange mechanisms is more than two-stage, these heat exchange mechanisms are arranged according to before and after the flow direction of high pressure cryogenic fluid;
The preheating heat exchanger of heat exchange mechanisms is connected with the decompressor of expansion power generation mechanism.
Expansion power generation mechanism of the present invention is two-stage, is set to first order expansion power generation mechanism and second level expansion power generation mechanism according to succession; Described heat exchange mechanisms is two-stage, is set to first order heat exchange mechanisms and second level heat exchange mechanisms according to succession.
The fluid output of the cooling heat exchanger of first order heat exchange mechanisms of the present invention is communicated with the fluid input of the cooling heat exchanger of second level heat exchange mechanisms; The fluid output of the preheating heat exchanger of first order heat exchange mechanisms is communicated with the fluid input of the decompressor of first order expansion power generation mechanism; The fluid input of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid output of the decompressor of first order expansion power generation mechanism, and the fluid output of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid input of the decompressor of second level expansion power generation mechanism.
The fluid inlet of the preheating heat exchanger of first order heat exchange mechanisms of the present invention is communicated with the fluid output of the decompressor of first order expansion power generation mechanism, and the fluid output of the preheating heat exchanger of first order heat exchange mechanisms is communicated with the fluid inlet of the decompressor of second level expansion power generation mechanism; The fluid input of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid output of the decompressor of second level expansion power generation mechanism; The fluid inlet of the cooling heat exchanger of first order heat exchange mechanisms is communicated with the fluid output of the cooling heat exchanger of second level heat exchange mechanisms.
The fluid output of the preheating heat exchanger of first order heat exchange mechanisms of the present invention is communicated with the fluid input of the decompressor of first order expansion power generation mechanism; The fluid input of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid output of the decompressor of second level expansion power generation mechanism.
The present invention compared with prior art, have the following advantages and effect: the fluid energy that simply efficient can reclaim high pressure low temperature, efficiency has reclaimed low-grade waste heat energy regenerating simultaneously, and compressor inlet gas temperature is reduced to the temperature lower than environment, and then significantly reduce the power consumption of compressor, effectively can implement can bring significant effects of energy saving and emission reduction in the present invention to iron and steel, petroleum and petrochemical industry and industrial park according to actual conditions.
Accompanying drawing explanation
Fig. 1 is the structural representation of the working procedure of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the working procedure of the embodiment of the present invention 2.
Fig. 3 is the structural representation of the working procedure of the embodiment of the present invention 3.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
See Fig. 1 ~ Fig. 3, the system of the embodiment of the present invention comprises expansion power generation mechanism and heat exchange mechanisms.
Expansion power generation mechanism comprises decompressor 3, electricity generating device and electric power output apparatus 4.
Decompressor 3 is connected with electricity generating device; Electricity generating device is connected with electric power output apparatus 4; Constitute one-stage expansion power facility.
When expansion power generation mechanism is more than two-stage, these expansion power generation mechanisms connect successively according to before and after the flow direction of high pressure cryogenic fluid, the fluid output of previous stage expansion power generation mechanism decompressor 3 is communicated with the fluid input of rear stage expansion power generation mechanism decompressor 3, forms the above expansion power generation mechanism of two-stage; These expansion power generation mechanisms are defined as first order expansion power generation mechanism, second level expansion power generation mechanism successively according to succession ... n-th grade of expansion power generation mechanism.In the present embodiment, expansion power generation mechanism is two-stage, forms double expansion power facility.
The expansion power generation mechanism of more than one-level or two-stage can be designed according to the energy figure of high pressure cryogenic fluid.
The expansion power generation process of above double expansion power facility is:
(1), high pressure cryogenic fluid is introduced into first order expansion power generation mechanism, after decompressor 3 expansion work of first order expansion power generation mechanism, rotating mechanical energy can be converted in fluid, then the electricity generating device of this grade of expansion power generation mechanism utilizes this rotating mechanical energy to generate electricity, then exports through the electric power output apparatus 4 of this grade of expansion power generation mechanism;
(2), after the fluid temperature (F.T.) and pressure drop of the expansion of first order expansion power generation mechanism, second level expansion power generation mechanism is entered into, fluid is after decompressor 3 expansion work of this second level expansion power generation mechanism, rotating mechanical energy can be arrived in fluid, then the electricity generating device of this grade of expansion power generation mechanism utilizes this rotating mechanical energy to generate electricity, then exports through the electric power output apparatus 4 of this grade of expansion power generation mechanism;
(3) if, second level expansion power generation mechanism fluid out decrease temperature and pressure be just directly discharged into environment to close to external pressure; If also arrange one-stage expansion power facility again higher than external pressure.
Heat exchange mechanisms comprises cooling heat exchanger 1, preheating heat exchanger 2, pump 5 and cooling loop 6.Cooling heat exchanger 1, preheating heat exchanger 2, pump 5 are successively set in cooling loop 6, have the fluid for heat exchange in cooling loop 6.Fluid heat transfer in fluid in cooling heat exchanger 1 and cooling loop 6, fluid heat transfer in fluid in cooling loop 6 and preheating heat exchanger 2, finally realize the fluid in cooling heat exchanger 1 and the fluid heat transfer in preheating heat exchanger 2, the fluid in cooling heat exchanger 1 passes to the fluid in preheating heat exchanger 2 heat; Pump 5 urges the circular fluidic flow in cooling loop 6.
When heat exchange mechanisms is more than two-stage, these heat exchange mechanisms are arranged according to before and after the flow direction of high pressure cryogenic fluid, form the above heat exchange mechanisms of two-stage; These heat exchange mechanisms are defined as first order heat exchange mechanisms, second level heat exchange mechanisms successively according to succession ... n-th grade of expansion power generation mechanism.In the present embodiment, expansion power generation mechanism is two-stage, forms double expansion power facility.
The preheating heat exchanger 2 of heat exchange mechanisms is connected with the decompressor 3 of expansion power generation mechanism; The fluid output of preheating heat exchanger 2 is communicated with the fluid input of decompressor 3, and/or the fluid input of preheating heat exchanger 2 is communicated with the fluid output of decompressor 3.
Embodiment 1:
The present embodiment reclaims low-grade exhaust heat process and expansion power generation process is carried out simultaneously, reclaims while high pressure cryogenic fluid energy carries out generating electricity and reclaims low-quality waste heat energy regenerating.
As shown in Figure 1, in the present embodiment, expansion power generation mechanism is a two-stage type, forms double expansion power facility.Heat exchange mechanisms is also two-stage, forms two-stage heat exchange mechanisms.
The fluid output of the cooling heat exchanger 1 of first order heat exchange mechanisms is communicated with the fluid input of the cooling heat exchanger 1 of second level heat exchange mechanisms.The fluid output of the preheating heat exchanger 2 of first order heat exchange mechanisms is communicated with the fluid input of the decompressor 3 of first order expansion power generation mechanism; The fluid input of the preheating heat exchanger 2 of second level heat exchange mechanisms is communicated with the fluid output of the decompressor 3 of first order expansion power generation mechanism, and the fluid output of the preheating heat exchanger 2 of second level heat exchange mechanisms is communicated with the fluid input of the decompressor 3 of second level expansion power generation mechanism.
There is now high pressure low temperature gas (nitrogen) source, flow Q:500 cube m/h, T1=25 DEG C, P1=1.3MPa; Low-grade exhaust heat, Tf=150 DEG C, conveniently explains and calculates, and supposes T13=T14=T15=Tf.
(1) cooling heat exchanger 1 entering second level heat exchange mechanisms after the cooling heat exchanger 1 that, low-grade exhaust heat is introduced into first order heat exchange mechanisms participates in heat exchange again participates in heat exchange;
(2), state 1(T1, P1) high pressure low temperature gas is introduced into the preheating heat exchanger 2 of first order heat exchange mechanisms; This preheating heat exchanger 2 heated nitrogen is from state 1(T1, P1) to state 2(T2, P2), assuming that T2=100 DEG C, P2=1.3MPa;
(3), then high pressure low temperature nitrogen enter the decompressor 3 of first order expansion power generation mechanism, expand into state 3, T3=30 DEG C through decompressor 3, P3=0.4MPa, simultaneously generate electricity 135kw/h(suppose this grade of generating efficiency 0.65);
(4), the nitrogen of state 3 enters the preheating heat exchanger 2 of second level heat exchange mechanisms, and this preheating heat exchanger 2 heated nitrogen is from state 3(T3, P3) to state 5(T5, P5), T5=100 DEG C, P5=0.35MPa;
(5), then enter the decompressor 3 of second level expansion power generation mechanism, expand into state 6(T6, P6 through decompressor 3), T6=19 DEG C, P6=0.11MPa, the 157kw/h(that simultaneously generates electricity supposes this grade of generating efficiency 0.65).
It can thus be appreciated that total generated output is 292kw/h, wherein absorbing low-quality waste heat energy regenerating power generation part is 109kw/h.
Embodiment 2:
The present embodiment cooling compressor inlet gas process and expansion power generation process are carried out simultaneously, reclaim cooling-air compressor air inlet while high pressure cryogenic fluid energy carries out generating electricity, reduce air compressor power consumption.
As shown in Figure 2, in the present embodiment, expansion power generation mechanism is a two-stage type, forms double expansion power facility.Heat exchange mechanisms is also two-stage, forms two-stage heat exchange mechanisms.Gas compressor is two-stage, arranges before and after two-stage gas compressor, forms a two-stage gas compressor, and the first order of a two-stage type gas compressor, the second level are defined as first order gas compressor and second level gas compressor successively according to succession.
The fluid inlet of the preheating heat exchanger 2 of first order heat exchange mechanisms is communicated with the fluid output of the decompressor 3 of first order expansion power generation mechanism, and the fluid output of the preheating heat exchanger 2 of first order heat exchange mechanisms is communicated with the fluid inlet of the decompressor 3 of second level expansion power generation mechanism; The fluid input of the preheating heat exchanger 2 of second level heat exchange mechanisms is communicated with the fluid output of the decompressor 3 of second level expansion power generation mechanism.The fluid inlet of the cooling heat exchanger 1 of first order heat exchange mechanisms is communicated with the fluid output of the cooling heat exchanger 1 of second level heat exchange mechanisms, and the fluid output of the cooling heat exchanger 1 of first order heat exchange mechanisms is communicated with the fluid inlet of second level gas compressor.The fluid inlet of the cooling heat exchanger 1 of second level heat exchange mechanisms is communicated with the fluid output of first order gas compressor.
There is now high pressure low temperature gas (nitrogen) source, flow Q, 500 cubes ms/h, T-1=25 DEG C, P-1=1.30MPa; This source of the gas is other a two-stage air compressor (compression 11000 standard state air per hour), assuming that ambient condition 0, T0=25 DEG C, and P0=0.10MPa.
(1), the first order gas compressor exit gas cooling heat exchanger 1 that is introduced into the second level heat exchange mechanisms cooling heat exchanger 1 that enters first order heat exchange mechanisms after participating in heat exchange again participates in heat exchange, finally enters second level gas compressor as inlet gas;
(2), high pressure low temperature gas (T-1=25 DEG C, P-1=1.30MPa) decompressor 3 of first order expansion power generation mechanism is entered, do work through this decompressor 3, gas internal energy is converted to rotating mechanical energy, then the electricity generating device of this grade of expansion power generation mechanism utilizes this rotating mechanical energy to generate electricity E1=107kw/h, drops to T-2=-31 DEG C, P-2=0.40MPa through the nitrogen temperature of overexpansion and pressure;
(3) preheating heat exchanger 2 that, then nitrogen enters first order heat exchange mechanisms goes cooling first order gas compressor exit gas to make it from state 7(T-7, P-7) change to state 8(T-8=10 DEG C, P-8=0.40MPa);
(4), state 3(T-3, P-3) expansion nitrogen enters the decompressor 3 of second level expansion power generation mechanism again, do work through this decompressor 3, gas internal energy is converted to rotating mechanical energy, then the electricity generating device of this grade of expansion power generation mechanism utilizes this rotating mechanical energy to generate electricity out electric power E2=136kw/h, gas through overexpansion changes to state 4(T-4=-20 DEG C, P-4=0.40MPa);
(5) preheating heat exchanger 2 that, then nitrogen enters second level heat exchange mechanisms goes cooling first order gas compressor exit gas to make it from state 6(T-6=80 DEG C, P-6=0.40MPa) change to state 7(T-7, P-7); Expansion nitrogen is from state 4(T-4=-20 DEG C, P-4=0.11MPa simultaneously) change to state 5(T-5=10 DEG C, P-5=0.10MPa);
(6), state 8(T-8=10 DEG C, P-8=0.40MPa) entered second level gas compressor by pressurized gas as inlet gas and be compressed to state 9(T-9=90 DEG C, P-9=1.20MPa).
The generating of high pressure low temperature gas energy is reclaimed for 243kw/h by double expansion power facility, make the outlet temperature of first order gas compressor be that the pressurized air of T-6=80 DEG C is cooled to T-8=10 DEG C through two-stage simultaneously, decrease this grade of compression power consumption 108kw/h, decrease 20% with the compression power consumption ratio not carrying out this grade of inlet gas cooling compressor, power savings is remarkable.
Embodiment 3:
The present embodiment reclaims low-grade exhaust heat process and cooling compressor inlet gas process and expansion power generation process to carry out simultaneously, reclaim while high pressure cryogenic fluid carries out generating electricity and reclaim low-quality waste heat energy regenerating, cooled gas compressor air inlet simultaneously, reduces gas compressor power consumption.
As shown in Figure 3, in the present embodiment, expansion power generation mechanism is two-stage, forms double expansion power facility.Heat exchange mechanisms is also two-stage, forms two-stage heat exchange mechanisms.Gas compressor is two two-stage types, arranges before and after two-stage gas compressor, forms two-stage gas compressor, first, second level of a two-stage gas compressor is defined as first order gas compressor and second level gas compressor successively according to succession.
The fluid output of the preheating heat exchanger 2 of first order heat exchange mechanisms is communicated with the fluid input of the decompressor 3 of first order expansion power generation mechanism.The fluid input of the preheating heat exchanger 2 of second level heat exchange mechanisms is communicated with the fluid output of the decompressor 3 of second level expansion power generation mechanism; The fluid inlet of the cooling heat exchanger 1 of second level heat exchange mechanisms is communicated with the fluid output of first order gas compressor, and the fluid output of this cooling heat exchanger 1 is communicated with the gas inlet of second level gas compressor.
(1) cooling heat exchanger 1 that, low-grade exhaust heat enters first order heat exchange mechanisms participates in heat exchange; The cooling heat exchanger 1 that first order gas compressor exit gas enters second level heat exchange mechanisms participates in heat exchange, then enters second level gas compressor as inlet gas;
(2), state 1(T-1=25 DEG C, P-1=1.3MPa) high pressure low temperature nitrogen is with flow Q1=15t/h(4.1kg/s) flow out, be introduced into the preheating heat exchanger 2 of first order heat exchange mechanisms, reclaim low-quality thermal energy state and change to state 2(T-2=100 DEG C, P-2=0.1MPa);
(3), high pressure low temperature nitrogen enters the decompressor 3 of first order expansion power generation mechanism and the decompressor 3 of second level expansion power generation mechanism subsequently successively, decompressor 3 through double expansion power facility does work, gas internal energy is converted to rotating mechanical energy, after the electricity generating device of double expansion power facility utilizes this rotating mechanical energy to generate electricity to produce E1=181kw/h and E2=414kw/h, nitrogen state changes to state 3(T-3=-41.0 DEG C, P-3=0.15MPa);
(4) exit gas that the preheating heat exchanger 2 that, the nitrogen of state 3 enters second level heat exchange mechanisms goes cooling first order gas compressor to produce, make it from state 5(rated flow 11000m3/h standard state, T-5=80 DEG C, P-5=0.4MPa) state 6(T-6=10 DEG C is changed to, P-6=0.4MPa);
(5), the exit gas of state 6 enters second level gas compressor as inlet gas, then is compressed to state 7 (T-7=90 DEG C, P-7=1.2MPa) through second level gas compressor.
Air temperature after the compression of first order gas compressor reaches 80 DEG C, is cooled to the high-pressure air that temperature is 10 DEG C, and such gas can make to reduce power consumption Wc=288 kw when second level gas compression.High pressure low temperature give up nitrogen expansion generating the low-quality used heat Hw=309 kw of simultaneously stability and cool the inlet gas of second level gas compressor, reduce gas temperature 70 DEG C, decrease high stage compressor power consumption Wc=288 kw.The system worked under these conditions income per hour is: generating E=595 kw; Reclaim low-quality used heat Hw=309 kw; Reduce gas compressor compression power consumption Wc=288 kw, if work 4000 hours year, it is 0.555kg/kwh that the CO2 of standard coal fired power generation discharges original unit, electricity price is 0.70 yuan/kwh, this system only generates electricity annual increase income 166.6 ten thousand yuan, and year reduce CO2 and discharge 1321 tons, effects of energy saving and emission reduction is remarkable.
Each component names of the present invention, structure, working principle are the common practise of those skilled in the art.
In addition, it should be noted that, the specific embodiment described in this specification, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this specification is only to structure example of the present invention explanation.
Claims (9)
1. utilize high pressure cryogenic fluid to generate electricity and reclaim a method for low-grade exhaust heat and cooling compressor inlet gas, it is characterized in that: comprising expansion power generation process, reclaim low-grade exhaust heat process and cooling compressor inlet gas process; A, expansion power generation process are: high pressure cryogenic fluid is sent into decompressor, and after decompressor acting, can be converted to rotating mechanical energy in fluid, then electricity generating device utilizes this rotating mechanical energy to generate electricity, then exports through electric power output apparatus;
B, recovery low-grade exhaust heat process are: low-grade exhaust heat is sent into cooling heat exchanger, low-grade exhaust heat in cooling heat exchanger and the high pressure cryogenic fluid heat exchange in preheating heat exchanger, the low-grade exhaust heat in cooling heat exchanger passes to heat the high pressure cryogenic fluid in preheating heat exchanger; This high pressure cryogenic fluid is the high pressure cryogenic fluid in expansion power generation process;
C, cooling compressor inlet gas process are: compressor inlet gas is sent into cooling heat exchanger, compressor inlet gas in cooling heat exchanger and the high pressure cryogenic fluid heat exchange in preheating heat exchanger, the compressor inlet gas in cooling heat exchanger passes to heat the high pressure low temperature gas in preheating heat exchanger; This high pressure low temperature gas is the high pressure low temperature gas in expansion power generation process;
Wherein, reclaim low-grade exhaust heat process and/or cooling compressor inlet gas process and expansion power generation process to carry out simultaneously.
2. method according to claim 1, is characterized in that: when recovery low-grade exhaust heat process and expansion power generation process are carried out simultaneously, and low-grade exhaust heat enters cooling heat exchanger and participates in heat exchange, and high pressure cryogenic fluid enters preheating heat exchanger and participates in heat exchange; High pressure cryogenic fluid is sent into decompressor after being preheated heat exchanger heating and is generated electricity.
3. method according to claim 1, is characterized in that: when cooling compressor inlet gas process and expansion power generation process are carried out simultaneously, and compressor inlet gas enters cooling heat exchanger and participates in heat exchange, and high pressure cryogenic fluid enters preheating heat exchanger and participates in heat exchange; High pressure cryogenic fluid is sent into decompressor after being preheated heat exchanger heating and is carried out generating electricity or become low normal pressure and temperature fluid drainage and go out.
4. method according to claim 1, it is characterized in that: reclaim low-grade exhaust heat process and cooling compressor inlet gas process and expansion power generation process when carrying out simultaneously, low-grade exhaust heat enters one-level cooling heat exchanger, high pressure cryogenic fluid enters one-level preheating heat exchanger, this grade of cooling heat exchanger and this grade of preheating heat exchanger carry out heat exchange, and high pressure cryogenic fluid is sent into decompressor after being preheated heat exchanger heating and generated electricity; Compressor inlet gas enters another grade of cooling heat exchanger, high pressure cryogenic fluid after generating enters another grade of preheating heat exchanger, this grade of cooling heat exchanger and this grade of preheating heat exchanger carry out heat exchange, and high pressure cryogenic fluid is sent into decompressor and carried out generating electricity or become low normal pressure and temperature fluid drainage and go out after being preheated heat exchanger heating.
5. utilize high pressure cryogenic fluid to generate electricity and reclaim a system for low-grade exhaust heat and cooling compressor inlet gas, it is characterized in that: comprise expansion power generation mechanism and heat exchange mechanisms;
Expansion power generation mechanism comprises decompressor, electricity generating device and electric power output apparatus; Decompressor is connected with electricity generating device; Electricity generating device is connected with electric power output apparatus; When expansion power generation mechanism is more than two-stage, these expansion power generation mechanisms connect successively according to before and after the flow direction of high pressure cryogenic fluid, and the fluid output of previous stage expansion power generation mechanism decompressor is communicated with the fluid input of rear stage expansion power generation mechanism decompressor;
Heat exchange mechanisms comprises cooling heat exchanger, preheating heat exchanger, pump and cooling loop; Cooling heat exchanger, preheating heat exchanger, pump is successively set in cooling loop; Fluid in cooling heat exchanger and the fluid heat transfer in cooling loop, fluid in cooling loop and the fluid heat transfer in preheating heat exchanger, make the fluid in cooling heat exchanger and the fluid heat transfer in preheating heat exchanger, the fluid in cooling heat exchanger passes to heat the fluid in preheating heat exchanger; When heat exchange mechanisms is more than two-stage, arrange before and after the flow direction of these heat exchange mechanisms according to high pressure low temperature gas;
The preheating heat exchanger of heat exchange mechanisms is connected with the decompressor of expansion power generation mechanism.
6. system according to claim 5, is characterized in that: described expansion power generation mechanism is two-stage, is set to first order expansion power generation mechanism and second level expansion power generation mechanism according to succession; Described heat exchange mechanisms is two-stage, is set to first order heat exchange mechanisms and second level heat exchange mechanisms according to succession.
7. system according to claim 6, is characterized in that: the fluid output of the cooling heat exchanger of first order heat exchange mechanisms is communicated with the fluid input of the cooling heat exchanger of second level heat exchange mechanisms; The fluid output of the preheating heat exchanger of first order heat exchange mechanisms is communicated with the fluid input of the decompressor of first order expansion power generation mechanism; The fluid input of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid output of the decompressor of first order expansion power generation mechanism, and the fluid output of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid input of the decompressor of second level expansion power generation mechanism.
8. system according to claim 6, it is characterized in that: the fluid inlet of the preheating heat exchanger of first order heat exchange mechanisms is communicated with the fluid output of the decompressor of first order expansion power generation mechanism, the fluid output of the preheating heat exchanger of first order heat exchange mechanisms is communicated with the fluid inlet of the decompressor of second level expansion power generation mechanism; The fluid input of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid output of the decompressor of second level expansion power generation mechanism; The fluid inlet of the cooling heat exchanger of first order heat exchange mechanisms is communicated with the fluid output of the cooling heat exchanger of second level heat exchange mechanisms.
9. system according to claim 6, is characterized in that: the fluid output of the preheating heat exchanger of first order heat exchange mechanisms is communicated with the fluid input of the decompressor of first order expansion power generation mechanism; The fluid input of the preheating heat exchanger of second level heat exchange mechanisms is communicated with the fluid output of the decompressor of second level expansion power generation mechanism.
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