CN103410574B - Natural gas pressure difference generating and cold recovery system and Application way - Google Patents
Natural gas pressure difference generating and cold recovery system and Application way Download PDFInfo
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- CN103410574B CN103410574B CN201310329037.4A CN201310329037A CN103410574B CN 103410574 B CN103410574 B CN 103410574B CN 201310329037 A CN201310329037 A CN 201310329037A CN 103410574 B CN103410574 B CN 103410574B
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Abstract
The open natural gas pressure difference generating of the present invention and cold recovery system and Application way, natural gas pressure difference generating and cold recovery system comprise the isobaric regenerative dryer system of adsorption type, Turbine expansion unit, speed reducer, generator and swelling heat exchanger system, the isobaric regenerative dryer system of adsorption type is connected with Turbine expansion unit, Turbine expansion unit respectively with speed reducer, swelling heat exchanger system connects, generator is connected with speed reducer, generator is connected with electricity consumption electrical network, Turbine expansion unit comprises at least two turbo-expanders, every platform turbo-expander is all connected with a swelling heat exchanger, Turbine expansion unit is by swelling heat exchanger and low pressure natural gas inlet communication.Natural gas pressure difference generating of the present invention and cold recovery system realize the high-pressure natural gas of input being decompressed to low pressure natural gas, reclaim cold simultaneously, make full use of the energy, realize energy-saving and emission-reduction better to after the heat exchange gas of low temperature.
Description
Technical field
The present invention relates to generating and cold recovery system, particularly relate to natural gas pressure difference generating and cold recovery system.
The invention still further relates to the method for generating and cold recovery, particularly the Application way of above-mentioned natural gas pressure difference generating and cold recovery system.
Background technique
Natural gas _ raw material gas adopts high-pressure delivery, needs decompression when arriving user terminal, and this part pressure reduced is not utilized at present, causes the waste of energy.And existing be all decompression bypass system, can not effective use of energy sources, can not cold recovery be carried out, can not be used for generating.
Summary of the invention
The present invention completes to solve above-mentioned deficiency of the prior art, structure the object of this invention is to provide while can be implemented in simply, completely the high-pressure natural gas of input is decompressed to the rock gas needing pressure, expansion work is utilized to generate electricity, reclaim cold to after the heat exchange gas of low temperature simultaneously, make full use of the energy, generate electricity and reclaim cold, realizing natural gas pressure difference generating and the cold recovery system of energy-saving and emission-reduction better.
Natural gas pressure difference generating of the present invention and cold recovery system, comprise the isobaric regenerative dryer system of the adsorption type arranged between high-pressure natural gas outlet and low pressure natural gas import, Turbine expansion unit, speed reducer, generator and swelling heat exchanger system, the isobaric regenerative dryer system of described adsorption type is connected with Turbine expansion unit, described Turbine expansion unit respectively with speed reducer, swelling heat exchanger system connects, described generator is connected with described speed reducer, described generator is connected with extraneous electricity consumption electrical network, described Turbine expansion unit comprises at least two turbo-expanders, i.e. the first turbo-expander and the second turbo-expander, described swelling heat exchanger system comprises at least two swelling heat exchangers, i.e. the first swelling heat exchanger and the second swelling heat exchanger, described every platform turbo-expander all connects with corresponding described swelling heat exchanger, described first turbo-expander is connected with described first swelling heat exchanger, described second turbo-expander is connected with described second swelling heat exchanger, be connected with the turbo-expander at latter a group at the described swelling heat exchanger of last group, described second turbo-expander is connected with described first swelling heat exchanger, described rock gas is successively through the isobaric regenerative dryer system of described adsorption type, first turbo-expander, first swelling heat exchanger, second turbo-expander, second swelling heat exchanger, next group turbo-expander and swelling heat exchanger, the freeze cycle water of circulation is had in described swelling heat exchanger, the described turbo-expander of least significant end passes through the described swelling heat exchanger of least significant end and described low pressure natural gas inlet communication, the isobaric regenerative dryer system of described adsorption type comprises the first tower drier, second tower drier, predrying tower, heater, cooler and moisture trap, described high-pressure natural gas outlet and described first tower drier, be communicated with respectively by air inlet sequencing valve between second tower drier and moisture trap, described high-pressure natural gas outlet is communicated with by regeneration gas sequencing valve with described predrying tower and cooler respectively, described first tower drier, second tower drier, heater is connected with Turbine expansion unit respectively by dry gas outlet sequencing valve, described heater is communicated with described predrying tower, described cooler is communicated with described moisture trap, be communicated with between described regeneration gas sequencing valve with described air inlet sequencing valve.
Natural gas pressure difference generating of the present invention and cold recovery system can also be:
The isobaric regenerative dryer system of described adsorption type comprises the first tower drier, second tower drier, predrying tower, heater, cooler and moisture trap, described high-pressure natural gas outlet and described first tower drier, be communicated with respectively by air inlet sequencing valve between second tower drier and moisture trap, described high-pressure natural gas outlet is communicated with by regeneration gas sequencing valve with described predrying tower and cooler respectively, described first tower drier, second tower drier, heater is connected with Turbine expansion unit respectively by dry gas outlet sequencing valve, described heater is communicated with described predrying tower, described cooler is communicated with described moisture trap, be communicated with between described regeneration gas sequencing valve with described air inlet sequencing valve.
Flow control valve is provided with between described high-pressure natural gas outlet and described air inlet sequencing valve, be provided with pressure maintaining valve between described dry gas outlet sequencing valve and Turbine expansion unit, between described high-pressure natural gas outlet and described regeneration gas sequencing valve, be provided with flowmeter.
Described calorifier inlets is communicated with medium pressure steam source, and described heater outlet is communicated with steam-condensation water source, and described cooler is communicated with cooling water backwater source with water source on cooling water respectively.
Decompression bypass system is also provided with between described high-pressure natural gas outlet and described low pressure natural gas import.
Natural gas pressure difference generating of the present invention and cold recovery system, it comprises the isobaric regenerative dryer system of the adsorption type arranged between high-pressure natural gas outlet and low pressure natural gas import, Turbine expansion unit, speed reducer, generator and swelling heat exchanger system, the isobaric regenerative dryer system of described adsorption type is connected with Turbine expansion unit, described Turbine expansion unit respectively with speed reducer, swelling heat exchanger system connects, described generator is connected with described speed reducer, described generator is connected with extraneous electricity consumption electrical network, described rock gas is successively through the isobaric regenerative dryer system of described adsorption type, Turbine expansion unit, swelling heat exchanger, described Turbine expansion unit comprises at least two turbo-expanders, described every platform turbo-expander is all connected with a described swelling heat exchanger, the freeze cycle water of circulation is had in described swelling heat exchanger, described Turbine expansion unit is by described swelling heat exchanger and described low pressure natural gas inlet communication.Like this, normal temperature high voltage rock gas exports the isobaric regenerative dryer system of adsorption type to from high-pressure natural gas outlet and carries out adsorption dry, dried normal temperature high voltage natural gas transport is to Turbine expansion unit, turbo-expander inner high voltage rock gas expansion work in Turbine expansion unit, the speed reducer that expansion energy drives turbo-expander to connect and generator generate electricity, gas pressure reduces simultaneously, temperature reduces, low-temp low-pressure natural gas transport after expansion power generation carries out heat exchange to heat exchanger, after heat exchange, natural gas temperature rises, freeze cycle water in heat exchanger absorbs cold, temperature reduces and is delivered to carries out cold recovery with cool equipment or poultry cool equipment, and the Room-temperature low-pressure rock gas obtained after heat exchange enters low pressure natural gas import for user.Be generate electricity the step-down while relative to the advantage of prior art like this, and can carry out cold recovery, effective energy saving, makes full use of the energy, is dropped to by cost minimum, meets national energy-saving and reduces discharging policy.
Another object of the present invention be to provide a kind of can be implemented in completely the high-pressure natural gas of input is decompressed to the rock gas needing pressure while, expansion work is utilized to generate electricity, reclaim cold to after the heat exchange gas of low temperature simultaneously, make full use of the energy, generate electricity and reclaim cold, realizing natural gas pressure difference generating and the cold recovery system Application way of energy-saving and emission-reduction better.
Natural gas pressure difference generating of the present invention and cold recovery system Application way, comprise the following steps:
A. adsorption dry dehydration: the high-pressure natural gas exported from described high-pressure natural gas is dry through the isobaric regenerative dryer system of adsorption type, deviates from moisture content;
B. expansion power generation: dried high-pressure natural gas, successively by the first turbo-expander expansion work of Turbine expansion unit, drives speed reducer and generator operation generating, and to the extraneous electricity consumption mains supply be attached thereto;
C. expansion decompression: the high-pressure natural gas in the first turbo-expander is after expansion work, the gas pressure exported reduces, temperature reduces, post-decompression rock gas is raised by temperature after the first swelling heat exchanger heat exchange of being connected with the first turbo-expander, again by the second turbo-expander expansion work generating of next stage, after after the rock gas of decompression cooling further passes the second swelling heat exchanger heat exchange be connected with the second turbo-expander afterwards, temperature raises, obtain low pressure natural gas, the import of this low pressure natural gas input low pressure natural gas is for user, or again generated electricity by the turbo-expander expansion work of next stage, after after the rock gas of decompression cooling further passes the swelling heat exchanger heat exchange of the peer be connected with the turbo-expander of this grade afterwards, temperature raises, obtain low pressure natural gas, after after least significant end one-level turbo-expander and the heat exchange of least significant end swelling heat exchanger, temperature raises again, obtain low pressure natural gas, the import of this low pressure natural gas input low pressure natural gas is for user,
D. cold recovery: through the rock gas of swelling heat exchanger by the freeze cycle water for cooling in swelling heat exchanger, reclaims cold and also exports cooling equipment to.
Natural gas pressure difference generating of the present invention and cold recovery system Application way, owing to have employed above-mentioned steps, can be implemented in while the high-pressure natural gas of input is decompressed to the rock gas needing pressure completely, expansion work is utilized to generate electricity, reclaim cold to after the heat exchange gas of low temperature simultaneously, make full use of the energy, generate electricity and reclaim cold, realizing energy-saving and emission-reduction better.
Accompanying drawing explanation
Fig. 1 natural gas pressure difference generating of the present invention and cold recovery system schematic.
The isobaric drying system schematic diagram of adsorption type of Fig. 2 natural gas pressure difference of the present invention generating and cold recovery system.
Fig. 3 natural gas pressure difference generating of the present invention and cold recovery system adsorption dry step natural gas flow are to schematic diagram.
Fig. 4 natural gas pressure difference generating of the present invention and cold recovery system tower drier regeneration intensification natural gas flow are to schematic diagram.
Fig. 5 natural gas pressure difference generating of the present invention and cold recovery system embodiment oppositely lower the temperature natural gas flow to schematic diagram.
Figure number explanation
1 ... high-pressure natural gas outlet 2 ... low pressure natural gas import 3 ... generator
4 ... the isobaric regenerative dryer system 5 of adsorption type ... speed reducer 6 ... heat exchanger
7 ... turbo-expander 8 ... Turbine expansion unit 9 ... cooler
10 ... decompression bypass system 11 ... first tower drier 12 ... second tower drier
13 ... predrying tower 14 ... heater 15 ... moisture trap
16 ... flowmeter 17 ... flow control valve 18 ... pressure maintaining valve
19 ... dry gas outlet sequencing valve 20 ... regeneration gas sequencing valve 21 ... air inlet sequencing valve
Embodiment
Fig. 1 to Fig. 5 below in conjunction with accompanying drawing is described in further detail natural gas pressure difference of the present invention generating and cold recovery system and Application way.
Natural gas pressure difference generating of the present invention and cold recovery system, please refer to Fig. 1 to Fig. 5, comprise the isobaric regenerative dryer system 4 of the adsorption type arranged between high-pressure natural gas outlet 1 and low pressure natural gas import 2, Turbine expansion unit 8, speed reducer 5, generator 3 and swelling heat exchanger 6 system, the isobaric regenerative dryer system 4 of described adsorption type is connected with Turbine expansion unit 8, described Turbine expansion unit 8 respectively with speed reducer 5, swelling heat exchanger 6 system connects, described generator 3 is connected with described speed reducer 5, described generator 3 is connected with extraneous electricity consumption electrical network, described Turbine expansion unit 8 comprises at least two turbo-expanders 7, i.e. the first turbo-expander 7 and the second turbo-expander 7, described swelling heat exchanger system comprises at least two swelling heat exchangers 6, i.e. the first swelling heat exchanger 6 and the second swelling heat exchanger 6, described every platform turbo-expander 7 all connects with corresponding described swelling heat exchanger 6, described first turbo-expander 7 is connected with described first swelling heat exchanger 6, described second turbo-expander 7 is connected with described second swelling heat exchanger 6, described swelling heat exchanger 6 at last group is connected with the turbo-expander 7 at latter a group, described second turbo-expander 7 is connected with described first swelling heat exchanger 6, described rock gas is successively through the isobaric regenerative dryer system 4 of described adsorption type, first turbo-expander 7, first swelling heat exchanger 6, second turbo-expander 7, second swelling heat exchanger 6, next group turbo-expander 7 and swelling heat exchanger 6, the freeze cycle water of circulation is had in described swelling heat exchanger 6, the turbo-expander of described least significant end is communicated with described low pressure natural gas import 2 by the described swelling heat exchanger 6 of least significant end.Like this, normal temperature high voltage rock gas (general pressure is 3.0Mpa) exports the isobaric regenerative dryer system 4 of adsorption type to from high-pressure natural gas outlet 1 and carries out adsorption dry and (be generally dried to moisture content and be less than 0.04g/Nm
3), dried normal temperature high voltage natural gas transport to Turbine expansion unit 8, the turbo-expander 7 inner high voltage rock gas expansion work in Turbine expansion unit 8.The main work of turbo-expander completes in nozzle therein and impeller, pressurized gas are risen rapidly can be reached velocity of sound by flow velocitys after decompressor nozzle, high-speed gas impacts impeller makes wheel rotation, the electricity generating device generatings such as the rotational drive electrical generators of impeller, when wheel speed exceedes normal, the speed of impeller can reduce by the retarder of configuration, ensures the normal operation of the electricity generating devices such as generator below.The speed reducer 5 that expansion energy drives turbo-expander 7 to connect and generator 3 generate electricity, gas pressure reduction simultaneously, temperature reduce, low-temp low-pressure natural gas transport after expansion power generation carries out heat exchange to heat exchanger 6, after heat exchange, natural gas temperature rises, freeze cycle water in heat exchanger 6 absorbs cold, temperature reduces and is delivered to carries out cold recovery with cool equipment or poultry cool equipment, and the Room-temperature low-pressure rock gas obtained after heat exchange enters low pressure natural gas import 2 for user.Be generate electricity the step-down while relative to the advantage of prior art like this, and can carry out cold recovery, effective energy saving, makes full use of the energy, is dropped to by cost minimum, meets national energy-saving and reduces discharging policy.Specifically after one-level turbo-expander 7 expansion work, turbo-expander 7 outlet temperature reaches about-25 DEG C, after heat exchanger 6 heat exchange, natural gas temperature is increased to about 10 DEG C, and the freeze cycle water producing about 12 DEG C carries out cold recovery, again after the generating of earphone turbo-expander 7 expansion work, Pressure Drop is to 0.8MPa, temperature drops to about-25 DEG C, again after heat exchanger 6 heat exchange, low pressure natural gas temperature rises to about 10 DEG C, and the freeze cycle water simultaneously obtaining about 12 DEG C carries out cold recovery.
Natural gas pressure difference generating of the present invention and cold recovery system, please refer to Fig. 1 to Fig. 5, the basis of previous technique scheme can be specifically the isobaric drying system of described adsorption type comprises the first tower drier 11, second tower drier 12, predrying tower 13, heater 14, cooler 9 and moisture trap 15, described high-pressure natural gas outlet and described first tower drier 11, be communicated with respectively by air inlet sequencing valve 21 between second tower drier 12 and moisture trap 15, described high-pressure natural gas outlet 1 is communicated with by regeneration gas sequencing valve 20 with described predrying tower 13 and cooler 9 respectively, described first tower drier 11, second tower drier 12, heater 14 is connected with Turbine expansion unit 8 respectively by dry gas outlet sequencing valve 19, described heater 14 is communicated with described predrying tower 13, described cooler 9 is communicated with described moisture trap 15, be communicated with between described regeneration gas sequencing valve 20 with described air inlet sequencing valve 21.Like this, when adsorption dry is carried out to normal temperature high voltage rock gas, by air inlet sequencing valve 21, the gas flow optimized of dry gas sequencing valve and regeneration gas sequencing valve 20 and pipeline conducting or closedown, and then realize carrying out adsorption dry to the high-pressure natural gas of input, also desorb intensification is carried out to the siccative that another one is not carried out in the tower drier of adsorption dry simultaneously, cooling regeneration, ensure the effect of tower drier adsorption dry, and desorption and regeneration is carried out to predrying tower 13 simultaneously, heat up and cooling procedure, whole process does not regenerate rock gas discharge, therefore Dry run 100% rock gas is recycled.Preferred technological scheme is be provided with flow control valve 17 between described high-pressure natural gas outlet 1 and described air inlet sequencing valve 21 further, be provided with pressure maintaining valve 18 between described dry gas outlet sequencing valve 19 and Turbine expansion unit 8, between described high-pressure natural gas outlet 1 and described regeneration gas sequencing valve 20, be provided with flowmeter 16.The effect arranging flow control valve 17 regulates the flow entering the high-pressure natural gas of air inlet sequencing valve 21, and the effect of flowmeter 16 calculates the amount of the high-pressure natural gas of regeneration gas sequencing valve 20 of entering, and then understand and control the dry natural gas of the absorption entered in the whole high-pressure natural gas in the isobaric regenerative dryer system 4 of whole adsorption type and the amount for the high-pressure natural gas that regenerates tower drier and predrying tower 13.And the effect of pressure maintaining valve 18 is the pressure of the stable high-pressure natural gas inputed in Turbine expansion unit 8, and then ensure the stability of generating and cold recovery, and the pressure of the low pressure natural gas exported after ensureing final expansion work meets user's usage requirement.
Concrete analysis adsorption dry regenerative system running is as follows:
The first step: high-pressure natural gas exports from high-pressure natural gas outlet 1, wherein most normal temperature high voltage rock gas enters air inlet sequencing valve 21 from a pipeline and enters the first tower drier 11 and carries out adsorption dry under the adjustment of flow control valve 17, high-pressure natural gas after adsorption dry inputs to Turbine expansion unit 8 from dry gas outlet sequencing valve 19 and carries out expansion power generation, midway needs pressure maintaining valve 18 to regulate the pressure inputing to the high-pressure natural gas of Turbine expansion unit 8, and this first step that circulates.
Second step: while the first tower drier 11 adsorption dry high-pressure natural gas, the sub-fraction of the high-pressure natural gas that high-pressure natural gas outlet 1 exports flows into system from an other pipeline, flowmeter 16 measures, drying is carried out by entering predrying tower 13 after regeneration gas sequencing valve 20, dried high-pressure natural gas exports from the bottom of predrying tower 13 and exports heater 14 to and heats, after heating, high-pressure natural gas enters the second tower drier 12 after exporting sequencing valve 19 by pipeline by dry gas, because the high-pressure natural gas after heating is High Temperature High Pressure rock gas, therefore it carries out desorb to the sorbent in the second tower drier 12, the moisture that absorption dehydration agent was adsorbed in last process flow, make temperature in the second tower drier 12 increase simultaneously, in second tower drier 12, stripping gas forms High Temperature High Pressure desorb rock gas after mixing with the rock gas of High Temperature High Pressure, this High Temperature High Pressure desorb rock gas exports from the second tower drier 12, input in cooler 9 through air inlet sequencing valve 21 and regeneration gas sequencing valve 20, the cooling water of cooler 9 Inner eycle and High Temperature High Pressure desorb heat exchange gas, High Temperature High Pressure desorb rock gas is lowered the temperature, then the high-pressure natural gas after cooling exports moisture trap 15 to and carries out air-water separation, water after separation is discharged, high-pressure natural gas after separation is delivered to and again enters the first tower drier 11 by air inlet sequencing valve 21 in the pipeline after flow control valve 17 and carry out adsorption dry.
3rd step: after having carried out second step again, the sub-fraction of the high-pressure natural gas that high-pressure natural gas outlet 1 exports again enters overcurrent gauge 16 by the pipeline of second step and enters regeneration gas sequencing valve 20, entered in the second tower drier 12 by air inlet sequencing valve 21 again and the second tower drier 12 is lowered the temperature, this high-pressure natural gas temperature raises simultaneously, second tower drier 12 temperature reduces, second tower drier 12 adsorption dry enters its high-pressure natural gas, this high-pressure natural gas is inputed in heater 14 by dry gas outlet sequencing valve 19 and heats, cooling water temperature simultaneously in heater 14 reduces, high-pressure natural gas after heating exports predrying tower 13 to from heater 14, desorption and regeneration is carried out to the siccative in predrying tower 13, cooling tower cooling is entered by regeneration gas sequencing valve 20 after high-pressure natural gas after hygroscopic moisture exports from predrying tower 13, moisture trap 15 Separation of Water is inputted again after its cooling, high-temperature natural gas is afterwards delivered to and again enters the first tower drier 11 by air inlet sequencing valve 21 in the pipeline after flow control valve 17 and carry out adsorption dry.
4th step: switch air inlet sequencing valve 21, regeneration gas sequencing valve 20 and dry gas sequencing valve, high-pressure natural gas exports from high-pressure natural gas outlet 1, wherein most normal temperature high voltage rock gas enters air inlet sequencing valve 21 from a pipeline and enters the second tower drier 12 and (carried out regeneration intensification cooling before under the adjustment of flow control valve 17, siccative regenerates) carry out adsorption dry, high-pressure natural gas after adsorption dry inputs to Turbine expansion unit 8 from dry gas outlet sequencing valve 19 and carries out expansion power generation, midway needs pressure maintaining valve 18 to regulate the pressure inputing to the high-pressure natural gas of Turbine expansion unit 8, and this first step that circulates.
5th step: while the second tower drier 12 adsorption dry high-pressure natural gas, the sub-fraction of the high-pressure natural gas that high-pressure natural gas outlet 1 exports flows into system from an other pipeline, flowmeter 16 measures, drying is carried out by entering predrying tower 13 after regeneration gas sequencing valve 20, dried high-pressure natural gas exports from the bottom of predrying tower 13 and exports heater 14 to and heats, after heating, high-pressure natural gas enters the first tower drier 11 (tower drier of adsorption dry major part high-pressure natural gas in a first step after exporting sequencing valve 19 by pipeline by dry gas, its internal desiccant absorption large quantity of moisture), because the high-pressure natural gas after heating is High Temperature High Pressure rock gas, therefore it carries out desorb to the sorbent in the first tower drier 11, the moisture that absorption dehydration agent was adsorbed in last process flow, make temperature in the first tower drier 11 increase simultaneously, in first tower drier 11, stripping gas forms High Temperature High Pressure desorb rock gas after mixing with the rock gas of High Temperature High Pressure, this High Temperature High Pressure desorb rock gas exports from the first tower drier 11, input in cooler 9 through air inlet sequencing valve 21 and regeneration gas sequencing valve 20, the cooling water of cooler 9 Inner eycle and High Temperature High Pressure desorb heat exchange gas, High Temperature High Pressure desorb rock gas is lowered the temperature, then the high-pressure natural gas after cooling exports moisture trap 15 to and carries out air-water separation, water after separation is discharged, high-pressure natural gas after separation is delivered to and again enters the second tower drier 12 by air inlet sequencing valve 21 in the pipeline after flow control valve 17 and carry out adsorption dry.
6th step: after having carried out the 5th step again, the sub-fraction of the high-pressure natural gas that high-pressure natural gas outlet 1 exports again enters overcurrent gauge 16 by the pipeline of the 5th step and enters regeneration gas sequencing valve 20, entered in the first tower drier 11 by air inlet sequencing valve 21 again and the first tower drier 11 is lowered the temperature, this high-pressure natural gas temperature raises simultaneously, first tower drier 11 temperature reduces, first tower drier 11 adsorption dry enters its high-pressure natural gas, this high-pressure natural gas is inputed in heater 14 by dry gas outlet sequencing valve 19 and heats, cooling water temperature simultaneously in heater 14 reduces, high-pressure natural gas after heating exports predrying tower 13 to from heater 14, desorption and regeneration is carried out to the siccative in predrying tower 13, cooling tower cooling is entered by regeneration gas sequencing valve 20 after high-pressure natural gas after hygroscopic moisture exports from predrying tower 13, moisture trap 15 Separation of Water is inputted again after its cooling, high-temperature natural gas is afterwards delivered to and again enters the second tower drier 12 by air inlet sequencing valve 21 in the pipeline after flow control valve 17 and carry out adsorption dry.
7th step: be cycled to repeat the first to the 6th step.
Namely the regeneration of tower drier heats up with the gas flow of the process that cools mesohigh rock gas is afterwards antipodal.And in tower drier and the predrying tower 13 of regeneration one at regeneration stage, so another is exactly drying stage, one is in drying stage to high-pressure natural gas drying, and so another is exactly at desorption and regeneration.Further preferred technological scheme is that described heater 14 entrance is communicated with medium pressure steam source, and described heater 14 outlet is communicated with steam-condensation water source, and described cooler 9 is communicated with cooling water backwater source with water source on cooling water respectively.Be use medium pressure steam and high-pressure natural gas carry out heat exchange and heat the high-pressure natural gas of its inside in such heater 14, what therefore it passed into is medium pressure steam, and what flow out after heat exchange is steam condensate.And cooler 9 carries out heat exchange by water on cooling water to the High Temperature High Pressure rock gas in cooler 9 and flows out cooling water backwater.
Natural gas pressure difference generating of the present invention and cold recovery system, please refer to Fig. 1 to Fig. 5, on the basis of foregoing technological scheme, can also be also be provided with the bypass system 10 that reduces pressure between described high-pressure natural gas outlet 1 and described low pressure natural gas import 2.This decompression bypass system 10 is exactly the depressurized system that high-pressure natural gas general is at present decompressed to that low pressure natural gas uses, the object arranging this decompression bypass system 10 is once after isobaric regenerative dryer system 4, Turbine expansion unit 8 and heat exchanger 6 damage of adsorption type, when can not carry out normal decompression generating and cold recovery, start decompression bypass system 10 and high-pressure natural gas is decompressed to low pressure natural gas, belong to depressurized system for subsequent use.
Aforesaid natural gas pressure difference generating of the present invention and cold recovery system Application way, please refer to Fig. 1 to Fig. 5, comprise the following steps:
A. adsorption dry dehydration: the high-pressure natural gas from described high-pressure natural gas outlet 1 is dry through the isobaric regenerative dryer system 4 of adsorption type, deviates from moisture content;
B. expansion power generation: dried high-pressure natural gas, successively by the first turbo-expander 7 expansion work of Turbine expansion unit 8, drives speed reducer 5 and generator 3 to run generating, and to the extraneous electricity consumption mains supply be attached thereto;
C. expansion decompression: the high-pressure natural gas in the first turbo-expander 7 is after expansion work, the gas pressure exported reduces, temperature reduces, post-decompression rock gas is raised by temperature after the first swelling heat exchanger 6 heat exchange of being connected with the first turbo-expander 7, again by the second turbo-expander 7 expansion work generating of next stage, after after the rock gas of decompression cooling further passes the second swelling heat exchanger 6 heat exchange be connected with the second turbo-expander 7 afterwards, temperature raises, obtain low pressure natural gas, the import 2 of this low pressure natural gas input low pressure natural gas is for user, or again generated electricity by turbo-expander 7 expansion work of next stage, after after the rock gas of decompression cooling further passes swelling heat exchanger 6 heat exchange of the peer be connected with the turbo-expander 7 of this grade afterwards, temperature raises, obtain low pressure natural gas, after after least significant end one-level turbo-expander 7 and least significant end swelling heat exchanger 6 heat exchange, temperature raises again, obtain low pressure natural gas, the import 2 of this low pressure natural gas input low pressure natural gas is for user,
D. cold recovery: through the rock gas of swelling heat exchanger 6 by the freeze cycle water for cooling in swelling heat exchanger 6, reclaims cold and also exports cooling equipment to.
Owing to have employed above-mentioned steps, can be implemented in while the high-pressure natural gas of input is decompressed to the rock gas needing pressure completely, expansion work is utilized to generate electricity, reclaim cold to after the heat exchange gas of low temperature simultaneously, make full use of the energy, generate electricity and reclaim cold, realizing energy-saving and emission-reduction better.
Aforesaid natural gas pressure difference generating of the present invention and cold recovery system Application way, please refer to Fig. 1 to Fig. 5, the basis of previous technique scheme can also be, in described step A, the drying of adsorption type regenerative dryer system comprises the following steps: (a). adsorption dry: the high-pressure natural gas that exports from high-pressure natural gas outlet 1 most enter adsorption desiccant in the first tower drier 11, first tower drier 11 to this portion of natural gas adsorption dry and input to Turbine expansion unit 8, (b). tower drier regeneration heats up: while carrying out (a) step, predrying tower 13 this portion of natural gas dry is entered from another fraction of the high-pressure natural gas of high-pressure natural gas outlet 1 output, become regeneration rock gas, dried regeneration natural gas transport heats to heater 14, regeneration rock gas after heating enters the second tower drier 12, second tower drier 12 is heated, before making in the siccative in the second tower drier 12, the moisture desorb of absorption obtains the desorb rock gas containing moisture, this desorb rock gas is delivered to cooler 9 by the second tower drier 12 top, cooler 9 cools this desorb rock gas to normal temperature, then this cooled desorb rock gas enters moisture trap 15 and carries out air-water separation, the regeneration rock gas of the gaseous state separated to be back in pipeline that air inlet sequencing valve and high-pressure natural gas export between 1 and finally to enter the first tower drier 11 and carries out drying and be delivered to Turbine expansion unit 8, c () is oppositely lowered the temperature: after (b) step completes, the sub-fraction of the high-pressure natural gas that high-pressure natural gas outlet 1 exports enters the second tower drier 12 and cools the siccative in the second tower drier 12, this high-pressure natural gas is by the desiccant dryness in the second tower drier 12 simultaneously, then this high-pressure natural gas inputs heater 14 again, high-pressure natural gas is heated again, dry High Temperature High Pressure rock gas after heating flows in predrying tower 13 again, to the siccative desorption and regeneration in predrying tower 13, produce circular regeneration rock gas, it is delivered to cooling in cooling tower again, and be delivered to moisture trap 15 air-water separation, circular regeneration rock gas after separation again to enter in pipeline that air inlet sequencing valve 21 and high-pressure natural gas export between 1 and finally enters the first tower drier 11 and carries out drying and be delivered to Turbine expansion unit 8, change use second tower drier 12 after (d) and carry out adsorption dry step (a), carry out regenerating (b) and (c) step that is dry and cooling to the first tower drier 11 simultaneously, the first tower drier 11 be about in (a) step switches to the second tower drier 12, and the second tower drier 12 in (b) and (c) step switches to and acts on the first tower drier 11.
Preferred technological scheme is in described step A further, the drying of adsorption type regenerative dryer system comprises the following steps: (a). adsorption dry: the high-pressure natural gas that exports from high-pressure natural gas outlet 1 most enter adsorption desiccant in the first tower drier 11, first tower drier 11 to this portion of natural gas adsorption dry through air inlet sequencing valve 21 and input to Turbine expansion unit 8 by dry gas outlet sequencing valve 19, (b). tower drier regeneration heats up: while carrying out (a) step, another fraction of high-pressure natural gas exported from high-pressure natural gas outlet 1 enters predrying tower 13 this regeneration rock gas dry through regeneration gas sequencing valve 20, dried regeneration rock gas enters heater 14 and heats, regeneration rock gas after heating enters the second tower drier 12 by dry gas outlet sequencing valve 19, second tower drier 12 is heated, before making in the siccative in the second tower drier 12, the moisture desorb of absorption obtains the desorb rock gas containing moisture, this desorb rock gas is delivered to cooler 9 by the second tower drier 12 top by air inlet sequencing valve 21 and regeneration gas sequencing valve 20, cooler 9 cools this desorb rock gas to normal temperature, then this cooled desorb rock gas enters moisture trap 15 and carries out air-water separation, the regeneration natural gas transport of the gaseous state separated also finally enters the first tower drier 11 and carries out drying and be delivered to Turbine expansion unit 8 to the pipeline between high pressure gas outlet 1 and air inlet sequencing valve 21, c () tower drier is lowered the temperature: after (b) step terminates, the high-pressure natural gas sub-fraction that high-pressure natural gas outlet 1 exports enters the second tower drier 12 through regeneration gas sequencing valve 20 and air inlet sequencing valve 21 and cools the siccative in the second tower drier 12, this high-pressure natural gas is by the desiccant dryness in the second tower drier 12 simultaneously, then this high-pressure natural gas inputs heater 14 through dry gas outlet sequencing valve 19 again, heater 14 heats again to this high-pressure natural gas, dry high-temperature natural gas after heating flows in predrying tower 13 again, to the desiccant regeneration in predrying tower 13, produce circular regeneration rock gas, circular regeneration rock gas is delivered in cooling tower through regeneration gas sequencing valve 20 again and cools, and be delivered to moisture trap 15 air-water separation, circular regeneration rock gas after separation again to enter in pipeline that air inlet sequencing valve 21 and high-pressure natural gas export between 1 and finally enters the first tower drier 11 and carries out drying and be delivered to Turbine expansion unit 8, change use second tower drier 12 after (d) and carry out adsorption dry step (a), carry out regenerating (b) and (c) step that is dry and cooling to the first tower drier 11 simultaneously, the first tower drier 11 be about in (a) step switches to the second tower drier 12, and the second tower drier 12 in (b) and (c) step switches to and acts on the first tower drier 11.Like this, all recycled high rock gas 100% dryings also enter decompression generating operation, make full use of the energy, avoid natural gas leaking and waste.
Above-mentionedly only several specific embodiments in the present invention to be illustrated; but can not as whole protection domain of the present invention; every according to the change of the equivalence done by design spirit in the present invention or to modify or equal proportion zooms in or out, all should think and fall into protection scope of the present invention.
Claims (7)
1. natural gas pressure difference generating and cold recovery system, it is characterized in that: comprise the isobaric regenerative dryer system of the adsorption type arranged between high-pressure natural gas outlet and low pressure natural gas import, Turbine expansion unit, speed reducer, generator and swelling heat exchanger system, the isobaric regenerative dryer system of described adsorption type is connected with Turbine expansion unit, described Turbine expansion unit respectively with speed reducer, swelling heat exchanger system connects, described generator is connected with described speed reducer, described generator is connected with extraneous electricity consumption electrical network, described Turbine expansion unit comprises at least two turbo-expanders, i.e. the first turbo-expander and the second turbo-expander, described swelling heat exchanger system comprises at least two swelling heat exchangers, i.e. the first swelling heat exchanger and the second swelling heat exchanger, described every platform turbo-expander all connects with corresponding described swelling heat exchanger, described first turbo-expander is connected with described first swelling heat exchanger, described second turbo-expander is connected with described second swelling heat exchanger, be connected with the turbo-expander at latter a group at the described swelling heat exchanger of last group, described second turbo-expander is connected with described first swelling heat exchanger, described rock gas is successively through the isobaric regenerative dryer system of described adsorption type, first turbo-expander, first swelling heat exchanger, second turbo-expander, second swelling heat exchanger, next group turbo-expander and swelling heat exchanger, the freeze cycle water of circulation is had in described swelling heat exchanger, the described turbo-expander of least significant end passes through the described swelling heat exchanger of least significant end and described low pressure natural gas inlet communication, the isobaric regenerative dryer system of described adsorption type comprises the first tower drier, second tower drier, predrying tower, heater, cooler and moisture trap, described high-pressure natural gas outlet and described first tower drier, be communicated with respectively by air inlet sequencing valve between second tower drier and moisture trap, described high-pressure natural gas outlet is communicated with by regeneration gas sequencing valve with described predrying tower and cooler respectively, described first tower drier, second tower drier, heater is connected with Turbine expansion unit respectively by dry gas outlet sequencing valve, described heater is communicated with described predrying tower, described cooler is communicated with described moisture trap, be communicated with between described regeneration gas sequencing valve with described air inlet sequencing valve.
2. natural gas pressure difference generating according to claim 1 and cold recovery system, it is characterized in that: between described high-pressure natural gas outlet and described air inlet sequencing valve, be provided with flow control valve, be provided with pressure maintaining valve between described dry gas outlet sequencing valve and Turbine expansion unit, between described high-pressure natural gas outlet and described regeneration gas sequencing valve, be provided with flowmeter.
3. natural gas pressure difference generating according to claim 1 and cold recovery system, it is characterized in that: described calorifier inlets is communicated with medium pressure steam source, described heater outlet is communicated with steam-condensation water source, and described cooler is communicated with cooling water backwater source with water source on cooling water respectively.
4. the natural gas pressure difference generating according to claim 1 or 2 or 3 and cold recovery system, is characterized in that: be also provided with decompression bypass system between described high-pressure natural gas outlet and described low pressure natural gas import.
5. claim 1 or the natural gas pressure difference described in 2 or 3 generate electricity and cold recovery system Application way, it is characterized in that: comprise the following steps:
A. adsorption dry dehydration: the high-pressure natural gas exported from described high-pressure natural gas is dry through the isobaric regenerative dryer system of adsorption type, deviates from moisture content;
B. expansion power generation: dried high-pressure natural gas, successively by the first turbo-expander expansion work of Turbine expansion unit, drives speed reducer and generator operation generating, and to the extraneous electricity consumption mains supply be attached thereto;
C. expansion decompression: the high-pressure natural gas in the first turbo-expander is after expansion work, the gas pressure exported reduces, temperature reduces, post-decompression rock gas is raised by temperature after the first swelling heat exchanger heat exchange of being connected with the first turbo-expander, again by the second turbo-expander expansion work generating of next stage, after after the rock gas of decompression cooling further passes the second swelling heat exchanger heat exchange be connected with the second turbo-expander afterwards, temperature raises, obtain low pressure natural gas, the import of this low pressure natural gas input low pressure natural gas is for user, or again generated electricity by the turbo-expander expansion work of next stage, after after the rock gas of decompression cooling further passes the swelling heat exchanger heat exchange of the peer be connected with the turbo-expander of this grade afterwards, temperature raises, obtain low pressure natural gas, after after least significant end one-level turbo-expander and the heat exchange of least significant end swelling heat exchanger, temperature raises again, obtain low pressure natural gas, the import of this low pressure natural gas input low pressure natural gas is for user,
D. cold recovery: through the rock gas of swelling heat exchanger by the freeze cycle water for cooling in swelling heat exchanger, reclaims cold and also exports cooling equipment to.
6. natural gas pressure difference generating according to claim 5 and cold recovery system Application way, it is characterized in that: in described step A, the drying of adsorption type regenerative dryer system comprises the following steps: (a): adsorption dry: the high-pressure natural gas exported from high-pressure natural gas outlet most enter the first tower drier, the adsorption desiccant in the first tower drier is to this portion of natural gas adsorption dry and input to Turbine expansion unit, (b): tower drier regeneration heats up: while carrying out (a) step, predrying tower this portion of natural gas dry is entered from another fraction of the high-pressure natural gas of high-pressure natural gas outlet output, become regeneration rock gas, dried regeneration natural gas transport heats to heater, regeneration rock gas after heating enters the second tower drier, second tower drier is heated, before making in the siccative in the second tower drier, the moisture desorb of absorption obtains the desorb rock gas containing moisture, this desorb rock gas is delivered to cooler by the second tower drier top, cooler cools this desorb rock gas to normal temperature, then this cooled desorb rock gas enters moisture trap and carries out air-water separation, the regeneration rock gas of the gaseous state separated be back to air inlet sequencing valve and high-pressure natural gas export between pipeline in and finally enter the first tower drier and carry out drying and be delivered to Turbine expansion unit, (c): oppositely lower the temperature: after (b) step completes, the sub-fraction of the high-pressure natural gas that high-pressure natural gas outlet exports enters the second tower drier and cools the siccative in the second tower drier, this high-pressure natural gas is by the desiccant dryness in the second tower drier simultaneously, then this high-pressure natural gas inputs heater again, high-pressure natural gas is heated again, dry High Temperature High Pressure rock gas after heating flows in predrying tower again, to the siccative desorption and regeneration in predrying tower, produce circular regeneration rock gas, it is delivered to cooling in cooling tower again, and be delivered to moisture trap air-water separation, circular regeneration rock gas after separation again enter air inlet sequencing valve and high-pressure natural gas export between pipeline in and finally enter the first tower drier and carry out drying and be delivered to Turbine expansion unit, (d): change use second tower drier afterwards and carry out adsorption dry step (a), carry out regenerating (b) and (c) step that is dry and cooling to the first tower drier simultaneously, the first tower drier be about in (a) step switches to the second tower drier, and the second tower drier in (b) and (c) step switches to the first tower drier effect.
7. natural gas pressure difference generating according to claim 6 and cold recovery system Application way, it is characterized in that: in described step A, the drying of adsorption type regenerative dryer system comprises the following steps: (a): adsorption dry: from high-pressure natural gas outlet export high-pressure natural gas most enter the first tower drier through air inlet sequencing valve, the adsorption desiccant in the first tower drier to this portion of natural gas adsorption dry and by dry gas outlet sequencing valve input to Turbine expansion unit, (b): tower drier regeneration heats up: while carrying out (a) step, another fraction of high-pressure natural gas exported from high-pressure natural gas outlet enters predrying tower this regeneration rock gas dry through regeneration gas sequencing valve, dried regeneration rock gas enters heater heating, regeneration rock gas after heating enters the second tower drier by dry gas outlet sequencing valve, second tower drier is heated, before making in the siccative in the second tower drier, the moisture desorb of absorption obtains the desorb rock gas containing moisture, this desorb rock gas is delivered to cooler by the second tower drier top by air inlet sequencing valve and regeneration gas sequencing valve, cooler cools this desorb rock gas to normal temperature, then this cooled desorb rock gas enters moisture trap and carries out air-water separation, the regeneration natural gas transport of the gaseous state separated also finally enters the first tower drier and carries out drying and be delivered to Turbine expansion unit to the pipeline between high pressure gas outlet and air inlet sequencing valve, (c): tower drier is lowered the temperature: after (b) step terminates, the high-pressure natural gas sub-fraction that high-pressure natural gas outlet exports enters the second tower drier through regeneration gas sequencing valve and air inlet sequencing valve and cools the siccative in the second tower drier, this high-pressure natural gas is by the desiccant dryness in the second tower drier simultaneously, then this high-pressure natural gas is again through dry gas outlet sequencing valve input heater, heater heats again to this high-pressure natural gas, dry high-temperature natural gas after heating flows in predrying tower again, to the desiccant regeneration in predrying tower, produce circular regeneration rock gas, circular regeneration rock gas is delivered in cooling tower through regeneration gas sequencing valve again and cools, and be delivered to moisture trap air-water separation, circular regeneration rock gas after separation again enter air inlet sequencing valve and high-pressure natural gas export between pipeline in and finally enter the first tower drier and carry out drying and be delivered to Turbine expansion unit, (d): change use second tower drier afterwards and carry out adsorption dry step (a), carry out regenerating (b) and (c) step that is dry and cooling to the first tower drier simultaneously, the first tower drier be about in (a) step switches to the second tower drier, and the second tower drier in (b) and (c) step switches to the first tower drier effect.
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