CN203307299U - High-temperature high-pressure biomass synthesis gas cooling and purifying equipment - Google Patents

High-temperature high-pressure biomass synthesis gas cooling and purifying equipment Download PDF

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Publication number
CN203307299U
CN203307299U CN2013203166936U CN201320316693U CN203307299U CN 203307299 U CN203307299 U CN 203307299U CN 2013203166936 U CN2013203166936 U CN 2013203166936U CN 201320316693 U CN201320316693 U CN 201320316693U CN 203307299 U CN203307299 U CN 203307299U
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heat boiler
gas
synthesis gas
tube exhaust
biomass synthesis
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张岩丰
聂洪涛
夏明贵
刘文焱
张亮
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Wuhan Kaidi Engineering Technology Research Institute Co Ltd
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Wuhan Kaidi Engineering Technology Research Institute Co Ltd
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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Abstract

The utility model discloses high-temperature high-pressure biomass synthesis gas cooling and purifying equipment which comprises a shell-and-tube waste heat boiler and a vertical smoke pipe waste heat boiler, as well as a Venturi scrubbing tower and a wet electric dust remover, wherein a gas inlet of the shell-and-tube waste heat boiler is connected with a synthesis gas outlet of a biomass gasifier, and a gas outlet is connected with an air inlet of the vertical smoke pipe waste heat boiler; a gas outlet of the vertical smoke pipe waste heat boiler is connected with a gas inlet of the Venturi scrubbing tower; a gas outlet of the Venturi scrubbing tower is connected with the input end of the wet electric dust remover; the output end of the wet electric dust remover is connected with a gas inlet of a gas storage tank. The biomass synthesis gas cooling and purifying equipment adopts the sectional cooling and the dual-pressure waste heat recovery, so as to realize the concentrated collection of heavy tar and the gradient recycling use of waste heat, thus improving the heat efficiency; by scrubbing gas and removing dust through the Venturi scrubbing tower and by arranging a post high-pressure process after the tar and dust removal is carried out through the wet electric dust remover, the biomass synthesis gas cooling and purifying equipment achieves a purification goal of tar and dust removal of biomass synthesis gas step by step, so as to control both the dust content and the tar content to be less than 10mg/Nm3.

Description

High Temperature High Pressure biomass synthesis gas cooling and purifying equipment
Technical field
The utility model relates to the purified synthesis gas technology, refers to particularly a kind of High Temperature High Pressure biomass synthesis gas cooling and purifying equipment.
Background technology
In field of energy utilization, several Nonrenewable resources of the most generally using such as oil, coal, Sweet natural gas, because a large amount of exploitations cause reserves sharply to descend, have formed one of three large crises of harm humans survival and development.And in China rural area, have every year the stalks such as a large amount of wheat straws, straw, husk, corn stalk, cotton stem, rape straw, Pericarppium arachidis hypogaeae to be thrown aside or burn, severe contamination environment.Therefore, utilize the biomass gasification technology of these biomass energy supplies to arise at the historic moment, the exploitation of biomass renewable and clean energy resource receive publicity day by day, and are among fast development, and Biogas, liquefaction are the important subject in new energy development field.
The scavenging process such as the same with gas maked coal, that Biogas also needs to experience is cooling, dedusting.At present, the method achievement in research that relevant gasifying biomass prepares synthetic gas is a lot, but how cooling less with the research purified about biomass synthesis gas, is mostly to continue to use the old way that traditional coal gas is cooling and wash.Traditional gas primary cool mode is divided into indirectly just cold, directly just cold three kinds of just cold and combinations, just coldly refers to that mainly coal gas out was cooled to it 22～35 ℃ from coking chamber before entering electrical tar precipitator.When indirectly just cold, coal gas does not directly contact with heat-eliminating medium, and a two-phase indirect heat transfer, do not carry out mass transfer process, coal gas cooling, decontamination effect improving is better.When cold directly, coal gas directly contacts with spraying ammoniacal liquor, carries out mass transfer and heat transfer process.With indirectly first cold comparing, the direct just cold characteristics that the coal gas cooling efficiency is high, resistance is little, equipment manufacturing cost is low, power consumption is large that have.Combination is just cold is the first indirect cooling directly cooling processing method of passing through again of process of coal gas, is characterized in having brought into play both strong points.In addition, the method for coal gas dust removal also has a lot, comprises sedimentation, filtration, cyclone dust removal, electric precipitation, washing or shaped Venturi dedusting etc., and different mode dust removing effects and resistance consumption difference are also larger.The equipment of coal gas tar removing is mainly electrical tar precipitator.
The synthetic gas characteristic produced due to different raw materials and gasifying process is not quite similar, and therefore will reach advanced decontamination index and economic target, should adopt system configuration targetedly.From coking chamber raw gas temperature out about 650 ℃ of left and right, and the temperature of biomass gasifying furnace exit synthetic gas is higher than the gas temperature in coking chamber exit, if ignore Biogas outlet cigarette temperature than the high particular case of gas maked coal outlet cigarette temperature, copy as sets the system configuration of gas primary cool, obviously can not reach cooling performance and the decontamination index of biomass synthesis gas.And, if the cooling and purifying equipment of simple analog tradition gas maked coal also exists system complex, long flow path, energy consumption is high, efficiency is low, stability and less economical defect.Therefore, provide a kind of equipment of cooling and purifying for the biomass gasifying furnace synthetic gas just to seem very necessary.
Summary of the invention
The purpose of this utility model will provide a kind of High Temperature High Pressure biomass synthesis gas cooling and purifying equipment exactly, and this equipment is high and can effectively reduce dust and the tar content in biomass synthesis gas to good cooling results, the sensible heat rate of recovery of synthetic gas.
For achieving the above object, the technical solution adopted in the utility model is: a kind of High Temperature High Pressure biomass synthesis gas cooling and purifying equipment, comprise shell-and-tube exhaust-heat boiler and vertical smoke tube exhaust-heat boiler for cooling biomass synthesis gas, and for venturi scrubber and the wet electrical dust precipitator of decontamination of biological matter synthetic gas, the inlet mouth of described shell-and-tube exhaust-heat boiler is connected with the syngas outlet of biomass gasifying furnace, the air outlet of described shell-and-tube exhaust-heat boiler is connected with the inlet mouth of vertical smoke tube exhaust-heat boiler, the air outlet of described vertical smoke tube exhaust-heat boiler is connected with the inlet mouth of venturi scrubber, the air outlet of described venturi scrubber is connected with the input terminus of wet electrical dust precipitator, the output terminal of described wet electrical dust precipitator is connected with the inlet mouth of gas-holder.
Further, the vapour outlet of described shell-and-tube exhaust-heat boiler is connected with the gasification agent inlet of biomass gasifying furnace by the middle pressure steam transfer lime.To in the steam input vapourizing furnace that waste heat recovery produces, for treating plant, provide pressure as vaporized chemical, the equipment that namely guaranteed is under barotropic state works, prevent the extraneous air cooling and purifying equipment that bleeds, reduced the possibility of gas explosion, significantly reduced again workshop section's overall energy consumption.
Further, the vapour outlet of described vertical smoke tube exhaust-heat boiler is connected with the wet gas current entrance of wet electrical dust precipitator by the low-pressure steam transfer lime.The steam that waste heat recovery is produced is back to purification system, has further reduced the energy consumption of purification section.
Again further, between described shell-and-tube exhaust-heat boiler and vertical smoke tube exhaust-heat boiler, be provided with the dry type gas filter, the inlet mouth of described dry type gas filter lower end is connected with the air outlet of shell-and-tube exhaust-heat boiler, the air outlet on described dry type gas filter top is connected with the inlet mouth of vertical smoke tube exhaust-heat boiler, the dust outlet of described dry type gas filter bottom is connected with the opening for feed of storehouse pump, and the discharge port of described storehouse pump is connected with grey storehouse.The dry type gas filter is arranged between the two-stage waste heat boiler as the rough dusting filtration unit, after rough dusting, has saved a large amount of wash-down waters and water treatment energy consumption, has also saved water treating equipment; The dust filtered down also rationally utilizes to grey library storage by air conveying after by the storehouse pump, being collected.
Further, the output terminal of described wet electrical dust precipitator also is connected with the inlet mouth of tail gas burning furnace.The tail gas burning boiler takes full advantage of the heat energy after the waste-gas burning that gasification and synthesizing section produce, and has improved the thermo-efficiency installed; Gas-holder tail gas burning furnace in parallel carries out burn processing and produces low-pressure steam externally confessing to waste gas.
The utility model, in conjunction with the physicochemical property of biomass high-temperature gasifying process and synthetic gas, has been done a large amount of experimental studies to its cooling and purifying process, and compared with prior art, its advantage is mainly reflected in following several respects:
One, the utility model adopt shell-and-tube exhaust-heat boiler and two sections of vertical smoke tube exhaust-heat boilers, two pressure waste heat recovery, and segmentation is cooling, has realized that the centralized collection of heavy tar is processed, and exhaust heat stepped reuse has improved the thermo-efficiency of equipment; Simultaneously, employing is without the dedusting of filler venturi scrubber gas washing, the high-pressure process of wet electrical dust precipitator decoking and dedusting postposition, realized the dedusting step by step of biomass synthesis gas, the purification target of tar removing, makes dust content<10mg/Nm in the biomass synthesis gas after processing 3, tar content all<10mg/Nm 3, temperature<55 ℃, the sensible heat rate of recovery is greater than 80%.
They are two years old, the utility model couples together the gasification agent inlet of the vapour outlet of shell-and-tube exhaust-heat boiler and biomass gasifying furnace with the middle pressure steam transfer lime, thereby the steam that waste heat boiler produces is inputted in biomass gasifying furnace, as vaporized chemical, provide pressure for treating plant, pressure by steam regulation, the equipment of assurance is under barotropic state works, prevent the extraneous air cooling and purifying equipment that bleeds, reduced the possibility of gas explosion, and the gas blower of gasification workshop section and the air compressor machine of synthesizing section have been saved, significantly reduced the overall energy consumption of gasification and synthetic oil workshop section, solved system complex in traditional gas purification process, long flow path, energy consumption is high, efficiency is low, stability and less economical, the problem that specific aim is not strong.
They are three years old, the utility model couples together the wet gas current entrance of the vapour outlet of vertical smoke tube exhaust-heat boiler and wet electrical dust precipitator with the low-pressure steam transfer lime, thereby the steam that waste heat recovery is produced is back to purification system, has further reduced the energy consumption of purification section.
They are four years old, the utility model adapts to the biomass gasifying furnace without urceolus, while having solved the urceolus water-cooled, gasification furnace structure is complicated, the body of heater size is large, the technical barrier of the easy dross of wall, the easy fouling of water side, when improving gasification stability, has also saved the cost of gasification primary device; In addition, the utility model is simple in structure, operation energy consumption is low, efficiency is high, security and stability is good, economic benefit is high.
The accompanying drawing explanation
Fig. 1 is a kind of structural representation of High Temperature High Pressure biomass synthesis gas cooling and purifying equipment.
Embodiment
The utility model will be further described below in conjunction with the drawings and specific embodiments, but the utility model is not limited to following embodiment.
High Temperature High Pressure biomass synthesis gas cooling and purifying equipment shown in Fig. 1, comprise shell-and-tube exhaust-heat boiler 2 and vertical smoke tube exhaust-heat boiler 4 for cooling biomass synthesis gas, and for venturi scrubber 5 and the wet electrical dust precipitator 6 of decontamination of biological matter synthetic gas, between shell-and-tube exhaust-heat boiler 2 and vertical smoke tube exhaust-heat boiler 4, be provided with dry type gas filter 3, the inlet mouth 8 of shell-and-tube exhaust-heat boiler 2 is connected with the syngas outlet 7 of biomass gasifying furnace 1, the air outlet 10 of shell-and-tube exhaust-heat boiler 2 is connected with the inlet mouth 18 of dry type gas filter 3 lower ends, the vapour outlet of shell-and-tube exhaust-heat boiler 2 is connected with the gasification agent inlet of biomass gasifying furnace 1 by middle pressure steam transfer lime 9, the air outlet 19 on dry type gas filter 3 tops is connected with the inlet mouth 11 of vertical smoke tube exhaust-heat boiler 4, the dust outlet 20 of dry type gas filter 3 bottoms is connected with the opening for feed of storehouse pump 21, the discharge port 22 of storehouse pump 21 is connected with grey storehouse 23, the air outlet 12 of vertical smoke tube exhaust-heat boiler 4 is connected with the inlet mouth 13 of venturi scrubber 5, the vapour outlet of vertical smoke tube exhaust-heat boiler 4 is connected with the wet gas current entrance of wet electrical dust precipitator 6 by low-pressure steam transfer lime 27, the air outlet 14 of venturi scrubber 5 is connected with the input terminus 15 of wet electrical dust precipitator 6, the output terminal 16 of wet electrical dust precipitator 6 is connected with the inlet mouth 26 of gas-holder 17, the output terminal 16 of wet electrical dust precipitator 6 also is connected with the inlet mouth 25 of tail gas burning furnace 24.Wherein, gas-holder 17 is the high-pressure ball type gas-holder; Dry type gas filter 3 is ceramic dry filter, adopts ceramic dry filter, can guarantee that efficiency of dust collection reaches more than 99.9% in 350～550 ℃ of scopes, and subsequent configuration wet electrical dust precipitator 6 can guarantee finally to reach the control index of dedusting and tar removing.
The technical process of aforesaid device is as follows: from biomass synthesis gas outlet 7 temperature out of biomass gasifying furnace 1, be 700～1500 ℃, and dust content<20g/Nm 3, tar content<3g/Nm 3biomass synthesis gas at first from the inlet mouth 8 of shell-and-tube exhaust-heat boiler 2, enter shell-and-tube exhaust-heat boiler 2, it is cooling that adopting process water carries out the first paragraph indirect heat exchange, warm waste heat during shell-and-tube exhaust-heat boiler 2 reclaims, from air outlet 10 biomass synthesis gas out of shell-and-tube exhaust-heat boiler 2, preferably be cooled to 350～550 ℃, more preferably be cooled to 400～500 ℃, in shell-and-tube exhaust-heat boiler 2, produce middle pressure steam, design pressure>=the 1.6MPa of shell-and-tube exhaust-heat boiler 2, preferred 1.6 ~ 2.0MPa, this middle pressure steam out returns to by middle pressure steam transfer lime 9 vaporized chemical be transported to biomass gasifying furnace 1 as biomass fuel from the vapour outlet of shell-and-tube exhaust-heat boiler 2, the size adjustment of vapor pressure can realize by setting pressure variable valve on steam conveying pipe, then biomass synthesis gas is sent into to dry type gas filter 3 from the inlet mouth 18 of dry type gas filter 3 lower ends and carry out rough dusting, the biomass synthesis gas after high-effective dust-removing from the air outlet 19 on dry type gas filter 3 tops out, then from the inlet mouth 11 of vertical smoke tube exhaust-heat boiler 4, enter vertical smoke tube exhaust-heat boiler 4, it is cooling that adopting process water carries out the second segment indirect heat exchange, vertical smoke tube exhaust-heat boiler 4 reclaims low temperature exhaust heat, from air outlet 12 biomass synthesis gas out of vertical smoke tube exhaust-heat boiler 4, preferably be cooled to 100～300 ℃, more preferably be cooled to 150～250 ℃, the low-pressure steam produced in vertical smoke tube exhaust-heat boiler 4 for follow-up wet electrical dust precipitator 6, carry out degree of depth dedusting and tar removing used, design pressure>=the 0.5MPa of vertical smoke tube exhaust-heat boiler 4, preferred 0.5 ~ 0.8MPa, this low-pressure steam out is transported to the wet gas current entrance of wet electrical dust precipitator 6 from the vapour outlet of vertical smoke tube exhaust-heat boiler 4 by low-pressure steam transfer lime 27, enter in wet electrical dust precipitator 6 and purge the dust in biomass synthesis gas as wet gas current, tar fog, biomass synthesis gas is in vertical smoke tube exhaust-heat boiler 4 in cooling down, the part heavy tar is separated out, logical groove bucket is collected and is removed, biomass synthesis gas is sent into from the inlet mouth 13 of venturi scrubber 5 lower ends to packless venturi scrubber 5 washs, dedusting, and further cooling, most dust in biomass synthesis gas, tar drip and water-soluble gas enters washings and removes, washings is rinse water, available cycles water or service water, this temperature from air outlet 14 biomass synthesis gas out of venturi scrubber 5 upper ends is down to 25～65 ℃, finally, biomass synthesis gas is sent into wet electrical dust precipitator 6 from the inlet mouth 15 of wet electrical dust precipitator 6 lower ends, utilizing the low-pressure steam produced in vertical smoke tube exhaust-heat boiler 4 to carry out degree of depth dedusting decoking processes, thereby by remaining a small amount of dust in biomass synthesis gas, tar fog purges and removes, and make the Pressure Drop to 0.1 of biomass synthesis gas～1Mpa, by above-mentioned cooling and purifying process, from dust content<10mg/Nm3 air outlet 16 biomass synthesis gas out on wet electrical dust precipitator 6 tops, tar content all<10mg/Nm3, temperature<55 ℃, the sensible heat rate of recovery is greater than 80%, qualified biomass synthesis gas is delivered to gas-holder 17 storages or exports for downstream section from the air outlet 28 of gas-holder, in parallel with gas-holder 17 is tail gas burning boiler 24, it is to start in system, when the biomass synthesis gas composition exceeds standard, waste gas is carried out to the visual plant of burn processing.Wherein, the dust that dry filter 3 filters down enters storehouse pump 21 through the dust outlet 20 of dry filter 3 bottoms, and the dust that storehouse pump 21 is collected is stored and rationally utilizes to grey storehouse 23 by air conveying through the discharge port 22 of storehouse pump 21.
The utility model will provide pressure as vaporized chemical for purification system in the middle pressure steam input biomass gasifying furnace 1 that shell-and-tube exhaust-heat boiler 2 produces, saved gas blower, by adjusting the pressure of steam, the pressure head that guarantees biomass gasifying furnace 1 outlet overcomes after the resistance of cooling and purifying system while arriving gas-holder 17 entrance 26 can also guarantee 0.1～1MPa(G) malleation, namely guaranteed biomass gasifying furnace 1, shell-and-tube exhaust-heat boiler 2, vertical smoke tube exhaust-heat boiler 4, venturi scrubber 5, wet scrubber 6, and gas-holder 17 is under barotropic state and works, prevent the extraneous air above treating plant that bleeds, reduced the possibility of gas explosion, and saved the air compressor machine of follow-up synthetic oil workshop section pressurization biogas, make gasification and synthetic oil workshop section overall energy consumption significantly reduce.
Distortion as present embodiment, can on the subsystems such as the feedwater of two-stage waste-heat oven, venturi scrubber recirculated water, wet electrical dust precipitator wash-down water, set up some standards and non-standard equipment, they form subsystem separately by pipeline and valve etc., for the relevant device service, and then complete the cooling and scavenging process of biomass synthesis gas.

Claims (6)

1. High Temperature High Pressure biomass synthesis gas cooling and purifying equipment, comprise shell-and-tube exhaust-heat boiler (2) and vertical smoke tube exhaust-heat boiler (4) for cooling biomass synthesis gas, and for venturi scrubber (5) and the wet electrical dust precipitator (6) of decontamination of biological matter synthetic gas, it is characterized in that: the inlet mouth (8) of described shell-and-tube exhaust-heat boiler (2) is connected with the syngas outlet (7) of biomass gasifying furnace (1), the air outlet (10) of described shell-and-tube exhaust-heat boiler (2) is connected with the inlet mouth (11) of vertical smoke tube exhaust-heat boiler (4), the air outlet (12) of described vertical smoke tube exhaust-heat boiler (4) is connected with the inlet mouth (13) of venturi scrubber (5), the air outlet (14) of described venturi scrubber (5) is connected with the input terminus (15) of wet electrical dust precipitator (6), the output terminal (16) of described wet electrical dust precipitator (6) is connected with the inlet mouth (26) of gas-holder (17).
2. High Temperature High Pressure biomass synthesis gas cooling and purifying equipment according to claim 1 is characterized in that: the vapour outlet of described shell-and-tube exhaust-heat boiler (2) is connected with the gasification agent inlet of biomass gasifying furnace (1) by middle pressure steam transfer lime (9).
3. High Temperature High Pressure biomass synthesis gas cooling and purifying equipment according to claim 1 is characterized in that: the vapour outlet of described vertical smoke tube exhaust-heat boiler (4) is connected with the wet gas current entrance of wet electrical dust precipitator (6) by low-pressure steam transfer lime (27).
4. according to claim 1 or 2 or 3 described High Temperature High Pressure biomass synthesis gas cooling and purifying equipment, it is characterized in that: be provided with dry type gas filter (3) between described shell-and-tube exhaust-heat boiler (2) and vertical smoke tube exhaust-heat boiler (4), the inlet mouth (18) of described dry type gas filter (3) lower end is connected with the air outlet (10) of shell-and-tube exhaust-heat boiler (2), the air outlet (19) on described dry type gas filter (3) top is connected with the inlet mouth (11) of vertical smoke tube exhaust-heat boiler (4), the dust outlet (20) of described dry type gas filter (3) bottom is connected with the opening for feed of storehouse pump (21), the discharge port (22) of described storehouse pump (21) is connected with grey storehouse (23).
5. according to claim 1 or 2 or 3 described High Temperature High Pressure biomass synthesis gas cooling and purifying equipment, it is characterized in that: the output terminal (16) of described wet electrical dust precipitator (6) also is connected with the inlet mouth (25) of tail gas burning furnace (24).
6. High Temperature High Pressure biomass synthesis gas cooling and purifying equipment according to claim 4, it is characterized in that: the output terminal (16) of described wet electrical dust precipitator (6) also is connected with the inlet mouth (25) of tail gas burning furnace (24).
CN2013203166936U 2013-06-03 2013-06-03 High-temperature high-pressure biomass synthesis gas cooling and purifying equipment Withdrawn - After Issue CN203307299U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105694986A (en) * 2016-04-06 2016-06-22 杭州燃油锅炉有限公司 Biomass gasifying device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105694986A (en) * 2016-04-06 2016-06-22 杭州燃油锅炉有限公司 Biomass gasifying device

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