CN116254137A - Synthetic gas anhydrous circulation washing and purifying device and purifying method - Google Patents
Synthetic gas anhydrous circulation washing and purifying device and purifying method Download PDFInfo
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- CN116254137A CN116254137A CN202211095730.5A CN202211095730A CN116254137A CN 116254137 A CN116254137 A CN 116254137A CN 202211095730 A CN202211095730 A CN 202211095730A CN 116254137 A CN116254137 A CN 116254137A
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- 238000005406 washing Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000007788 liquid Substances 0.000 claims abstract description 59
- 239000000428 dust Substances 0.000 claims abstract description 35
- 238000000746 purification Methods 0.000 claims abstract description 34
- 239000003599 detergent Substances 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 23
- 230000005587 bubbling Effects 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 10
- 230000008929 regeneration Effects 0.000 claims abstract description 5
- 238000011069 regeneration method Methods 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 50
- 238000003786 synthesis reaction Methods 0.000 claims description 50
- 238000001179 sorption measurement Methods 0.000 claims description 17
- 239000002699 waste material Substances 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 6
- 239000000571 coke Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000005235 decoking Methods 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 2
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- 235000015112 vegetable and seed oil Nutrition 0.000 description 2
- 239000008158 vegetable oil Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
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- -1 and the like Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
- C10K1/16—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids
- C10K1/18—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with non-aqueous liquids hydrocarbon oils
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/32—Purifying combustible gases containing carbon monoxide with selectively adsorptive solids, e.g. active carbon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
Abstract
The invention provides a synthetic gas anhydrous circulation washing and purifying device and a purifying method. The first circulating purification unit comprises a first shell and a heavy tar circulating spray system, and primarily captures heavy tar and dust particles in gas through Venturi washing, liquid film impact and air cooling; the blades of the mop fan consist of a large number of tiny wetting fiber filaments, and the larger surface area of the blades is beneficial to further interception of heavy tar and dust particles; the second circulating purification unit comprises a second shell and an oil-based detergent regeneration system, and absorbs the residual light tar in the gas through a bubbling mode and an activated carbon bed layer. The invention carries out gas purification by recycling the self-produced tar and carbon, and has no water washing in the whole process, thereby being economical and environment-friendly and having wide application prospect.
Description
Technical Field
The invention belongs to the technical field of gas purification, and is mainly used for washing and purifying crude synthesis gas, in particular relates to a device and a method for washing and purifying synthesis gas in a water-free circulation mode.
Background
Along with the continuous improvement of the industrialization level of China and the living standard of people, the output of organic wastes is also rapidly improved, the organic wastes can be effectively treated by pyrolysis or gasification, the principle is that organic macromolecules in the wastes are broken off by a thermochemical mode, so that micromolecular gas, tar and residues are produced, wherein gas products are mainly synthesis gas, and the synthesis gas can be used as raw gas in the chemical industry and has higher utilization value.
Because synthesis gas contains a certain amount of tar, the tar is gradually condensed into a viscous liquid at the temperature of 300 ℃ or below and adheres to the inner wall of a pipeline, so that the pipeline is blocked and corroded, and even the normal operation of the equipment is affected in severe cases. Thus, the raw synthesis gas must be cleaned and decoked before it can be used in downstream facilities.
At present, many research results related to gas purification equipment at home and abroad are disclosed, for example, a Chinese patent CN108130136A discloses a biomass gas tar purification device, the device adsorbs dust in tar through an active carbon layer arranged at the bottom of a cyclone separator, thereby recovering tar and being used as a detergent for washing gas, but the viscosity of heavy tar is very high, a large amount of heavy tar easily causes the blocking failure of the active carbon layer when passing through the active carbon layer, a Chinese patent CN214612331U discloses an organic solid waste pyrolysis gas purification device, the device recovers heat through heat exchange treatment on a gas pipeline, but the method can lead to the tar in the gas to be condensed on the inner wall of the pipeline in advance, so that the pipeline is blocked and corroded, the device also purifies the gas in a way of spraying alkali liquor, a large amount of oily wastewater is generated, tar products cannot be effectively collected, and energy waste is serious.
Disclosure of Invention
Aiming at the technical problems, the invention provides a synthetic gas anhydrous circulation washing and purifying device and application thereof, the device is used for removing coke in a combined way in various ways, the gas purifying efficiency is effectively improved, and oil-containing wastewater can not be generated in the purifying process by recycling tar and carbon which are products, and meanwhile, the tar is convenient to collect and store.
The present invention achieves the above technical object by the following means.
The synthetic gas anhydrous circulation washing and purifying device is characterized by comprising a first circulation purifying unit, a second circulation purifying unit and a mop fan connected with the first circulation purifying unit and the second circulation purifying unit;
the first circulating purification unit comprises a first shell, a venturi scrubber and a heavy tar circulating spray system, the venturi scrubber is vertically arranged in a central area inside the first shell, an air inlet of the venturi scrubber penetrates through the side wall of the upper part of the first shell to extend to the outside of the first shell, and an air outlet of the venturi scrubber faces to a liquid film pool at the bottom of the first shell; the heavy tar circulating spray system comprises a flash tank, a condenser, an oil-water separator, an oil storage tank and a first circulating pump which are sequentially connected in series, wherein a liquid inlet of the flash tank is connected with a liquid film pool through a pipeline, and the first circulating pump is also connected with an atomization spray head in the venturi scrubber;
the mop fan mainly comprises a shell, a fan inlet, a fan outlet, a blade rotating chamber, an oil collecting groove, mop blades and a driving motor for the mop blades; the mop blades are positioned in the blade rotating chamber and are in transmission connection with the driving motor, the mop blades consist of wet fine fiber wires, and channels are reserved among the mop blades for circulating synthetic gas; the oil collecting tank is positioned right below the vane rotating chamber, the fan inlet is positioned on the upper end surface of the shell and communicated with the vane rotating chamber, and the fan outlet is positioned on the upper part of the shell; the mop fan is communicated with the first shell through a fan inlet and a pipeline;
the second circulating purification unit comprises a second shell, a bubbling washer and an active carbon adsorption bed layer, wherein the second shell is divided into an upper cavity and a lower cavity, the bubbling washer is positioned in the lower cavity and comprises a bubbler and a bubble cutter, an air inlet of the bubbler is communicated with a fan outlet of a mop fan, and the bubble cutter is positioned above the bubbler; the activated carbon adsorption bed layer is located the upper cavity of second casing, and activated carbon adsorption bed layer bottom sets up the useless charcoal discharge port that extends to the outside of second casing, useless charcoal discharge port is by electromagnetic valve control switching, second casing top still is equipped with clean gas outlet and activated carbon inlet.
Further, a transparent observation window is arranged on the side wall of the bottom of the first shell, the observation window is positioned between the outlet of the Venturi scrubber and the liquid film pool, and the transparent observation window is also a liquid level display.
Further, anti-blocking cleaning nozzles are uniformly distributed in the first shell, are communicated with the cleaning liquid storage tank, and face the inner wall of the first shell and the outer wall of the venturi scrubber in the spraying direction; and a drain outlet is arranged at the bottom of the first shell.
Further, the installation angle of the mop blades is 27-40 degrees, and the number of the blades is 5-12.
Further, the fiber filaments forming the mop blade are made of nylon.
Further, the filaments constituting the mop blade are PA610.
Further, the upper chamber and the lower chamber of the second shell are separated by a conical partition plate with air holes, and the waste carbon outlet is arranged at the center of the conical partition plate.
Further, the oil-based detergent regeneration system comprises a stripping tower and a second circulating pump, wherein the stripping tower is connected with the lower part of the second shell of the second circulating purification unit, and is communicated with the upper part of the lower cavity of the second shell again through the second circulating pump.
Further, the fan outlet is tangential to the housing sidewall.
The purification method based on the synthesis gas anhydrous circulation washing purification device is characterized in that,
(1) The synthesis gas is firstly subjected to primary purification in a first circulating purification unit in a mode of combining venturi washing, liquid film impact and air cooling: wherein the venturi washing adopts heavy tar as a detergent, and a liquid film consists of a mixed liquid of oil and dust generated during venturi washing;
(2) The mop fan is used for purifying, the mop fan is closely connected with the rear end of the first circulating purifying unit, and when the mop fan starts to rotate, tar droplets and dust particles in the gas collide with fiber filaments and adhere to the fiber filaments, so that the synthesis gas is further purified;
(3) The second circulation purifying unit carries out final decoking purification on the synthetic gas from the mop fan through an activated carbon adsorption and bubbling washing mode, wherein the bubbling washing adopts an oil-based detergent which can be recycled through steam stripping, and the activated carbon is generated by diverting the synthetic gas back to the furnace to activate coke.
The invention has the beneficial effects that:
1. according to the invention, the first shell combines three applications of venturi washing, liquid film impact and air cooling, firstly, the venturi washer is used for chilling crude synthesis gas by spraying heavy tar, after tar droplets and dust particles are captured, the condensed tar droplets and dust particles are accelerated to impact a liquid film pool under the venturi washer, the gas is driven to rise reversely to start air cooling by the liquid film impact, the heavy tar droplets and dust are dissolved and deposited in the liquid film pool, no redundant pipeline exists in the whole process, the risk of tar blockage is avoided, and the three applications are tightly combined together, so that the gas purification efficiency is higher, the tar recovery is more convenient, a large amount of oily wastewater is not generated, and the method is environment-friendly and pollution-free.
2. The temperature of the heavy tar detergent rises after heat exchange with the crude synthesis gas, the flash tank can utilize the heat of the heavy tar detergent to realize rapid evaporation, and the heavy tar detergent can separate oil, water and dust particles by matching with a condenser and an oil-water separator, so that the stable effect of the heavy tar detergent is ensured, and meanwhile, the sensible heat of the crude synthesis gas is effectively recovered and utilized.
3. The blade of the mop fan consists of a small wetting fiber yarn, the effect of circulating the synthetic gas can be achieved through a special arrangement mode, meanwhile, the fiber yarn of the blade has a large surface area, and trace heavy tar droplets and small dust particles in the gas can be adsorbed on the surface of the fiber in the process of collision with the synthetic gas.
4. The lower chamber of the second shell is a bubbling washer, and is washed by adopting an oil-based detergent, the detergent can be vegetable oil, diesel oil, even restaurant waste oil and the like, and oil substances with good tar solubility, and the synthetic gas is fully contacted with the oil-based detergent under the actions of bubbling and bubble cutting, so that light tar in the gas is absorbed, and the oil-based detergent can be stripped and desorbed by using a stripping tower after working for a period of time, so that the oil-based detergent is recycled.
5. The upper chamber of the second shell is an active carbon adsorption bed layer, the active carbon is produced by diverting purified synthesis gas back to the furnace to activate coke, the abundant pore structure can adsorb light tar in the synthesis gas, and the catalyst can be used for combustion heating of a synthesis gas producer or a stripping tower after the adsorption performance is reduced, or can be re-activated for recycling.
Description of the drawings:
FIG. 1 is a schematic diagram of the overall structure of a device for washing and purifying synthesis gas anhydrous circulation.
Fig. 2 is a schematic structural view of a mop fan housing in the synthetic gas anhydrous circulation washing and purifying device according to the invention.
FIG. 3 is a schematic view of the structure of a mop blade in the synthetic gas anhydrous circulation washing and purifying device.
FIG. 4 is a schematic view of the structure of a conical partition plate in the synthesis gas anhydrous circulation washing and purifying device.
Reference numerals: 1 a first housing; 2-venturi scrubber inlet; 3-atomizing spray heads; a 4-venturi scrubber; 5-anti-blocking cleaning nozzles; 6-a transparent observation window; 7-a liquid film pool; 8-a sewage outlet; 9-a mop fan; 901-a casing; 902-a fan inlet; 903-fan outlet; 904-vane rotation chamber; 905-oil sumps; 906-mop blade; 10-a flash tank; 11-a condenser; 12-an oil-water separator; 13-a first circulation pump; 14-an oil storage tank; 15-a second housing; 16-an air outlet; 17-activated carbon inlet; 18-an activated carbon adsorption bed; 19 conical baffles; 20-an electromagnetic valve; 21-a bubble scrubber; 22-bubble cutter; 23-bubbler; 24-stripping column; 25-a second circulation pump; 26-waste carbon discharge port.
The specific embodiment is as follows:
embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the writing of the present invention, there are some azimuthal words, such as: the lower, upper, side, inner wall, left end, right end, one end, the other end, etc. are used for convenience of description and understanding of the schematic drawings, and do not represent that the actual objects need to be operated according to the requirements. Furthermore, there are some simple and common terms in the present invention, such as: the terms fixed, mounted, connected, and the like should be construed in a conventional sense, and for example, the term "connected" should be construed as a threaded connection between two parts, glued joint, etc., requiring specific understanding by those skilled in the art for a particular situation.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Fig. 1 is a schematic view of an embodiment of the present invention, and the apparatus for washing and purifying a synthesis gas anhydrous cycle according to the present invention includes a first cycle purifying unit, a second cycle purifying unit, and a mop fan 9 connecting the first cycle purifying unit and the second cycle purifying unit. The first circulating purification unit comprises a first shell 1, a venturi scrubber 4 and a heavy tar circulating spray system. The venturi scrubber 4 is vertically arranged in the central area inside the first shell 1, the venturi scrubber is fixed through a supporting piece connected with the inner wall of the first shell, the air inlet 2 of the venturi scrubber penetrates through the side wall of the upper part of the first shell 1 to extend to the outside of the first shell 1, the air inlet 2 can be directly connected with synthesis gas production equipment such as a pyrolysis furnace or a gasification furnace, and can also be connected with synthesis gas pre-dedusting equipment such as a cyclone separator, and the air outlet of the venturi scrubber 4 faces to a liquid film pool 7 at the bottom of the first shell 1. The liquid film pool 7 stores mixed liquid of heavy tar and dust with a certain depth, the liquid level of the mixed liquid is at a certain distance from the air outlet of the venturi scrubber 4, and the depth of the liquid film pool 7 and the distance from the liquid level to the outlet of the venturi scrubber 4 can be observed through the transparent observation window 6 on the side surface of the lower part of the first shell 1. The venturi scrubber 4 is a wet dust removal device, when the synthetic gas enters the venturi tube, a low-pressure area is formed at the necking position to force the synthetic gas to pass through at a high speed, an atomization nozzle 3 is arranged in front of the venturi tube, washing liquid sprayed by the nozzle is impacted and crushed into innumerable fine liquid drops by high-speed air flow, the liquid drops not only chill and cool the high-temperature synthetic gas, but also have a large contact surface area, so that dust and tar particles entrained in the gas are trapped by the liquid drops. Under the action of gravity acceleration, a large number of dust-containing oil droplets pass through the air outlet of the Venturi scrubber 4 and impact the liquid film pool 7 at a high speed, the air flow has an impact effect on the liquid film pool 7, meanwhile, the direction of the air flow is changed, the air flow starts to rise reversely so as to enter an annular air cooling area between the first shell 1 and the Venturi scrubber 4, and the dust-containing droplets continue to move according to the original direction due to the inertia effect until dust and tar are dissolved and deposited in the liquid film pool 7. The first shell 1 further comprises anti-blocking flushing nozzles 5 which are uniformly distributed in the shell, the inner wall of the first shell 1 and the outer wall of the Venturi scrubber 4 are regularly cleaned through spraying water or ethanol and other solutions, the air cooling effect of the annular air cooling area is guaranteed, and cleaned sewage is discharged from a sewage outlet 8 at the bottom of the first shell 1.
The heavy tar spray system comprises a flash tank 10, a condenser 11, an oil-water separator 12, an oil storage tank 14 and a first circulating pump 13. The liquid inlet of the flash tank 10 is communicated with the liquid film pool 7 at the bottom of the first shell 1 through a pipeline, along with the washing and purifying of the synthesis gas by the Venturi scrubber 4, the tar stock of the liquid film pool 7 is continuously increased, and redundant tar is input into the flash tank 10 through the pipeline for flash evaporation treatment. The heavy tar washing liquid is heated after heat and mass transfer with the synthesis gas, the temperature of the heavy tar washing liquid is increased, the temperature of the synthesis gas is reduced, the heavy tar washing liquid with higher temperature can quickly reach an overheat state by utilizing the negative pressure principle of flash evaporation, so that the heavy tar washing liquid is instantaneously evaporated into a gaseous state, solid-liquid separation of dust particles and tar is realized, the generated flash evaporation gas is condensed by a subsequent condenser 11 and separated by an oil-water separator 12 to obtain anhydrous heavy tar, the anhydrous heavy tar is input into an oil storage tank 14 through a pipeline, the heavy tar in the oil storage tank 14 is pumped into an atomizing nozzle 3 in a venturi scrubber 4 again under the action of a first circulating pump 13, and the synthesis gas is circularly washed, and the flash evaporation tank 10, the condenser 11, the oil-water separator 12, the oil storage tank 14 and the first circulating pump 13 are sequentially connected in series to form a circulating pipeline. Referring to fig. 2 and 3, the mop fan mainly includes a housing 901, a fan inlet 902, a fan outlet 903, a blade rotation chamber 904, a sump 905, mop blades 906, and a driving motor for the mop blades 906. The blade rotating chamber 904 is positioned at the upper part of the interior of the casing 901, the mop blades 906 are positioned in the blade rotating chamber 904 and are in transmission connection with the driving motor, the mop blades 906 are composed of wet fine fiber wires, and channels are reserved among the mop blades 906 for circulating the synthetic gas; the oil sump 905 is located directly below the vane rotary chamber 904, the fan inlet 902 is located at the upper end surface of the casing 901 and communicates with the vane rotary chamber 904, and the fan outlet 903 is located at the upper part of the casing 901. The fan inlet 902 communicates with the syngas outlet at the top of the first housing 1.
The tar droplets and dust particles collide with the rotating mop blades 906 in the blade rotating chamber 904, the mop blades 906 are formed by a large number of wetted fine fiber wires, the fiber wires are made of nylon materials, preferably corrosion-resistant PA610, the effect of circulating synthesis gas can be achieved through a special spiral arrangement mode, meanwhile, the fiber wires of the blades have a large surface area, trace heavy tar droplets and small dust particles in gas can be adsorbed on the surface of the fibers in the process of colliding with the synthesis gas, an oil collecting groove 905 is formed in the lower portion of the machine shell 901, the oil collecting groove 905 is located below the blade rotating chamber, the tar droplets and dust particles intercepted by the mop blades flow into the oil collecting groove 905 along the wall surface of the blade rotating chamber 904 under the action of centrifugal force, and a channel of a mop fan outlet 903 is tangential to the upper portion of the machine shell 901.
Referring to fig. 1 and 4, the second circulation purifying unit includes a second housing 15 and an oil-based detergent regeneration system, the second housing 15 is divided into an upper chamber and a lower chamber, a bubbling scrubber 21 is positioned in the lower chamber, and is washed by adopting an oil-based detergent, the detergent can be vegetable oil, diesel oil, even restaurant waste oil, and the like, and oil substances with good solubility for tar, the bubbling scrubber 21 includes a bubbler 23 and a bubble cutter 22, the inlet of the bubbler 23 is communicated with the outlet 903 of the mop fan, the synthetic gas from the mop fan 9 can be fully mixed with the oil-based detergent in a bubbling manner, the bubble cutter 22 is positioned above the bubbler 23, large bubbles of the synthetic gas released by the bubbler 23 are cut into smaller bubbles, the contact area of gas and liquid is increased, thereby absorbing light tar in the synthetic gas, the oil-based detergent regeneration system comprises a stripping tower 24 and a second circulating pump 25, wherein the stripping tower 24 forms a closed loop with the bubbling washer 21 through the second circulating pump 25, tar in the oil-based detergent is desorbed through periodical stripping operation, an upper chamber of the second shell 15 is an activated carbon adsorption bed layer 18, the upper chamber and the lower chamber are separated through a conical baffle 19 with pores, a waste carbon outlet 26 is arranged in the center of the conical baffle 19, the waste carbon outlet 26 is communicated with the bottom of the second shell 15, the waste carbon outlet 26 is controlled to be opened and closed by an electromagnetic valve 20, a clean synthetic gas outlet 16 and a waste carbon inlet 17 are also arranged at the top of the second shell 15, the activated carbon is a byproduct in the synthetic gas production process, the abundant pore structure of the activated carbon adsorbs and removes the light tar from the synthetic gas in the lower chamber, the activated carbon adsorption bed layer can be used for combustion heat supply of the synthetic gas generator or the stripping tower 24 after the adsorption performance is reduced, or is reactivated for reuse.
When the synthetic gas anhydrous circulation washing and purifying device is connected with a synthetic gas generation system, a first circulation purifying unit firstly carries out preliminary purification on the synthetic gas in a mode of combining venturi washing, liquid film impact and air cooling, the unit mainly removes heavy tar and large particle dust in the gas, the venturi washing adopts the heavy tar as a detergent, the liquid film is composed of mixed liquid of oil and dust generated by venturi washing, a mop fan 9 is closely connected with the rear end of the first circulation purifying unit, mop blades 906 of the mop fan are composed of a large number of fine fiber wires, tar liquid drops and dust particles in the gas collide and adhere with the fiber wires when the blades start to rotate, so that the synthetic gas is further purified, the mop fan 9 mainly intercepts trace heavy tar and small particle dust, the second circulation purifying unit mainly removes light tar in a mode of bubbling washing and active carbon adsorption on the synthetic gas from the mop fan 9, the unit mainly removes light tar, and the oil-based washing agent is adopted by the oil-based washing agent, and the oil-based washing agent can be recycled by the operation of the regenerated synthetic gas.
The working principle of the purification method of the invention is further described and explained below by taking purification of cotton straw synthetic gas as an example.
Cotton stalk is a renewable biomass energy source, and is gasified by biomass energy conversion technology to be converted into combustible gas or electric power. The gas yield of cotton stalk gasification by a downdraft gasifier is 100-600 m 3 The gasification efficiency is about 70%, and the tar and dust content in the unpurified biomass synthesis gas is generally 10-200g/m 3 While the content of tar allowed by the internal combustion engine is 30-50 mg/N m 3 Thus, the synthesis gas needs to be purified. The purification of the synthesis gas is carried out by adopting the purification device shown in the figure 1, and the purification method is as follows:
the operation temperature of the gasification furnace is 600-900 ℃, the gas outlet of the synthesis gas is directly connected with the gas inlet 2 of the venturi scrubber at the outer side of the first shell 1, the temperature and flow of the synthesis gas are monitored by a sensor arranged on a synthesis gas input pipeline, after the synthesis gas at high temperature enters the venturi scrubber 4, an atomization nozzle 3 in the scrubber starts to spray normal-temperature heavy tar detergent in an oil storage tank 14 into the venturi scrubber 4, the power of a first circulating pump 13 is controlled according to the temperature and flow parameters fed back by the sensor on the synthesis gas input pipeline, thereby adjusting the liquid-gas ratio of the heavy tar detergent to the synthesis gas, the temperature of the synthesis gas at about 800 ℃ is reduced to 200-300 ℃ after heat and mass transfer with the normal-temperature heavy tar detergent, and most heavy tar begins to condense and dissolve in the heavy tar detergent at the temperature, the dust is trapped along with the flowing liquid drop of the air flow, the trapping rate of the particles reaches 80-90%, the heavy tar liquid drop mixed with the dust particles is impacted with the air flow at high speed to the liquid film pool 7 at the bottom of the first shell 1, after the liquid film is impacted and air-cooled in the annular air cooling area between the first shell 1 and the Venturi scrubber 4, the synthetic air temperature is reduced to about 180 ℃, the liquid film pool 7 at the bottom is heated to 80-120 ℃ due to the collection of a large amount of heavy tar washing liquid which exchanges heat with high-temperature synthetic gas, the heavy tar containing impurities in the liquid film pool 7 is input into the flash tank 10 through a pipeline, the heavy tar which is overheated under the negative pressure operation is quickly changed into a gaseous state, so that a large amount of dust particles accumulated in the heavy tar are separated, the high-temperature flash gas is immediately introduced into the condenser 11 behind the flash tank 10, the condensed high-temperature hot water is generated by a boiler to steam and is introduced into a gasification furnace as a gasification agent, and the condensed heavy tar is separated from a small amount of water by an oil-water separator 12, and finally the pure heavy tar in a normal temperature state is returned to an oil storage tank 14, and then enters a venturi scrubber 4 again for scrubbing under the action of a first circulating pump 13.
After the primary purification of the synthetic gas by the first circulation washing system, most of dust particles and tar in the gas are removed, sensible heat of the synthetic gas is effectively recycled, the synthetic gas with the temperature reduced to about 180 ℃ is sucked by a mop fan 9 behind the first shell 1, the synthetic gas collides with a mop blade 906 rotating at a high speed in the blade rotating chamber 901,residual heavy tar and fine dust particles in the fuel gas are intercepted and adsorbed by the fiber filaments on the mop blades 906, and then are thrown away from the blades under the action of centrifugal force, and the thrown-away residual oil is collected through the oil collecting tank 905, and as most of the tar and dust particles are removed in the first circulation system, the tar in the oil collecting tank 905 is led into the flash tank 10 once every 15 days or so. After interception and purification by the mop fan 9, the temperature of the synthetic gas is reduced to 120-150 ℃, heavy tar and dust particles in the synthetic gas are completely removed, then the synthetic gas enters a bubbling washer 21 of a lower chamber of the second shell 15 under the pressurizing and conveying of the mop fan 9, and bubbles of the synthetic gas are blown out by a bubbler 23 arranged in the lower chamber, and the bubbles of the synthetic gas are further crushed into countless tiny bubbles by a bubble cutter 22 positioned above the bubbler 23, so that the heat and mass transfer area of the synthetic gas and the oil-based detergent is increased. After bubbling washing, the temperature of the synthesis gas is reduced to about 50 ℃, and most light tar in the gas is absorbed by the oil-based detergent. With the continuous bubbling washing, the oil-based detergent in the bubbling washer 21 is fed into the stripping tower 24 every 20 days or so for desorption operation, light tar and moisture in the oil-based detergent are removed, and then the organic detergent is fed into the bubbling washer 21 again for recycling through the second circulating pump 25. The bubbling and washing synthesis gas passes through the conical partition plate 19 and enters the activated carbon adsorption bed 18 of the upper chamber of the second shell 15, activated carbon is generated by the activation of the residual coke of the gasification furnace in the furnace, the activated carbon has a rich void structure, the residual light tar and moisture can be adsorbed, and finally clean synthesis gas without impurities is discharged from the gas outlet 16. The waste activated carbon with reduced adsorption performance is discharged through the waste carbon discharge port 26, and a part of the waste activated carbon is returned to the furnace for reactivation, and the other part is directly combusted for supplying heat to the stripping tower 24. The anhydrous circulating washing and purifying process has no oil-containing waste water, cyclic utilization of tar and carbon product, tar grading eliminating scheme and multiple system decoking technology are combined to perform decoking and purifying, no synthesis gas pre-treatment system is needed to be connected, the synthesis gas is directly connected with a synthesis gas generating device, the temperature of the synthesis gas from the gas outlet 16 can be reduced to 20-40 ℃, and the dust content is controlledIs prepared at 30mg/Nm 3 The tar content was below 18mg/Nm 3 The tar content allowed by the internal combustion engine was 50mg// Nm 3 Within the inner part.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (10)
1. The anhydrous cyclic washing and purifying device for the synthesis gas is characterized by comprising a first cyclic purifying unit, a second cyclic purifying unit and a mop fan (9) connected with the first cyclic purifying unit and the second cyclic purifying unit;
the first circulating purification unit comprises a first shell (1), a venturi scrubber (4) and a heavy tar circulating spray system, wherein the venturi scrubber (4) is vertically arranged in a central area inside the first shell (1), an air inlet (2) of the venturi scrubber penetrates through the side wall of the upper part of the first shell (1) to extend to the outside of the first shell (1), and an air outlet is opposite to a liquid film pool (7) at the bottom of the first shell (4); the heavy tar circulating spray system comprises a flash tank (10), a condenser (11), an oil-water separator (12), an oil storage tank (14) and a first circulating pump (13) which are sequentially connected in series, wherein a liquid inlet of the flash tank (10) is connected with a liquid film pool (7) through a pipeline, and the first circulating pump (13) is also connected with an atomizing nozzle (3) in a venturi scrubber (4);
the mop fan (9) mainly comprises a shell (901), a fan inlet (902), a fan outlet (903), a blade rotating chamber (904), an oil collecting groove (905), mop blades (906) and a driving motor for the mop blades (906); the blade rotating chamber (904) is positioned at the upper part of the interior of the casing (901), the mop blades (906) are positioned in the blade rotating chamber (904) and are in transmission connection with the driving motor, the mop blades (906) are composed of wet fine fiber wires, and channels are reserved among the mop blades (906) for circulating synthesis gas; the oil collecting groove (905) is positioned right below the vane rotating chamber (904), the fan inlet (902) is positioned on the upper end surface of the casing (901) and is communicated with the vane rotating chamber (904), and the fan outlet (903) is positioned on the upper part of the casing (901); the mop fan (9) is communicated with the first shell (1) through a fan inlet (902) and a pipeline;
the second circulating purification unit comprises a second shell (15), a bubbling washer (21) and an activated carbon adsorption bed layer (18), wherein the second shell (15) is divided into an upper cavity and a lower cavity, the bubbling washer (21) is positioned in the lower cavity and comprises a bubbler (23) and a bubble cutter (22), an air inlet of the bubbler (23) is communicated with a fan outlet (903) of a mop fan (9), and the bubble cutter (22) is positioned above the bubbler (23); the activated carbon adsorption bed (18) is located the upper chamber of second casing (15), and activated carbon adsorption bed (18) bottom sets up waste carbon discharge port (26) that extend to the outside of second casing (15), waste carbon discharge port (26) are by electromagnetic valve (20) control switching, second casing (15) top still is equipped with clean gas outlet (16) and activated carbon import (17).
2. The device for washing and purifying the anhydrous circulation of the synthetic gas according to claim 1, wherein a transparent observation window (6) is arranged on the side wall of the bottom of the first shell (1), the observation window (6) is positioned between the outlet of the venturi scrubber (4) and the liquid film pool (7), and the transparent observation window (6) is also a liquid level display.
3. The device for washing and purifying the synthesis gas anhydrous circulation according to claim 1, wherein anti-blocking cleaning nozzles (5) are uniformly distributed in the first shell (1), the anti-blocking cleaning nozzles (5) are communicated with a cleaning liquid storage tank, and the spraying direction faces the inner wall of the first shell (1) and the outer wall of the venturi scrubber (4); the bottom of the first shell (1) is provided with a sewage outlet (8).
4. The device according to claim 1, wherein the mop blades (906) are mounted at an angle of 27 ° to 40 ° and the number of blades is 5 to 12.
5. The apparatus of claim 1, wherein the filaments comprising the mop blade (906) are nylon.
6. The syngas anhydrous circulation scrubbing and cleaning device of claim 1, wherein the filaments comprising mop blades (906) are PA610.
7. The device for washing and purifying the anhydrous circulation of the synthetic gas according to claim 1, wherein the upper chamber and the lower chamber of the second shell (15) are separated by a conical partition plate (19) with air holes, and the waste carbon outlet (26) is arranged at the center of the conical partition plate (19).
8. The device for washing and purifying the anhydrous circulation of the synthesis gas according to claim 1, further comprising an oil-based detergent regeneration system, comprising a stripping tower (24) and a second circulation pump (25), wherein the stripping tower (24) is connected with the lower part of the second shell (15) of the second circulation and purification unit, and is communicated with the upper part of the lower chamber of the second shell (15) again through the second circulation pump (25).
9. The apparatus of claim 1, wherein the fan outlet (903) is tangential to a side wall of the housing (901).
10. A purification method based on a synthesis gas anhydrous cycle washing purification device according to any one of claims 1-9, characterized in that,
(1) The synthesis gas is firstly subjected to primary purification in a first circulating purification unit in a mode of combining venturi washing, liquid film impact and air cooling: wherein the venturi washing adopts heavy tar as a detergent, and a liquid film consists of a mixed liquid of oil and dust generated during venturi washing;
(2) The mop fan (9) is used for purifying, the mop fan (9) is closely connected with the rear end of the first circulating purification unit, and when the mop fan (9) starts to rotate, tar droplets and dust particles in the gas collide with fiber filaments and adhere to the fiber filaments, so that the synthesis gas is further purified;
(3) The second circulation purifying unit carries out final decoking purification on the synthetic gas from the mop fan through an activated carbon adsorption and bubbling washing mode, wherein the bubbling washing adopts an oil-based detergent which can be recycled through steam stripping, and the activated carbon is generated by diverting the synthetic gas back to the furnace to activate coke.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211095730.5A CN116254137A (en) | 2022-09-08 | 2022-09-08 | Synthetic gas anhydrous circulation washing and purifying device and purifying method |
| PCT/CN2022/141759 WO2024051034A1 (en) | 2022-09-08 | 2022-12-26 | Synthetic gas waterless circulation washing and purifying device and purifying method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211095730.5A CN116254137A (en) | 2022-09-08 | 2022-09-08 | Synthetic gas anhydrous circulation washing and purifying device and purifying method |
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| CN116254137A true CN116254137A (en) | 2023-06-13 |
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| CN202211095730.5A Withdrawn CN116254137A (en) | 2022-09-08 | 2022-09-08 | Synthetic gas anhydrous circulation washing and purifying device and purifying method |
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| CN (1) | CN116254137A (en) |
| WO (1) | WO2024051034A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118179178A (en) * | 2024-05-17 | 2024-06-14 | 成都伊斯顿过滤器有限公司 | Coal bed gas filter |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI67030B (en) * | 1981-06-26 | 1984-09-28 | Outokumpu Oy | FOER REFRIGERATION FOR ORGANIZATION OF A GASER INNEHAOLLANDEFASTA OCH GASFORMIGA FOERORENINGAR |
| RU1801558C (en) * | 1991-03-11 | 1993-03-15 | Г.В.Говоров и В.Г.Говоров | Gas cleaning unit |
| DE102013215120A1 (en) * | 2013-08-01 | 2015-02-05 | Siemens Aktiengesellschaft | Dust separation from the raw gas of an entrainment gasification |
| CN104312637A (en) * | 2014-11-10 | 2015-01-28 | 北京华福工程有限公司 | Efficient separating equipment special for chilling, deoiling and dedusting of pyrolysis gas |
| CN205368279U (en) * | 2016-01-22 | 2016-07-06 | 鲁西化工集团股份有限公司 | Synthetic gas dust pelletizing system |
| CN107892954A (en) * | 2017-12-07 | 2018-04-10 | 北京神源环保有限公司 | A kind of biomass pyrolytic air purifying apparatus and purification method |
| CN110305700A (en) * | 2019-07-12 | 2019-10-08 | 上海化工研究院有限公司 | A kind of high pressure synthesis gas device for deep cleaning and technique |
| CN112442395A (en) * | 2020-10-30 | 2021-03-05 | 新疆天智辰业化工有限公司 | Water coal slurry gasification coarse gas washing tower |
| CN214914539U (en) * | 2021-04-29 | 2021-11-30 | 武汉大方机电有限公司 | Washing air purifier |
-
2022
- 2022-09-08 CN CN202211095730.5A patent/CN116254137A/en not_active Withdrawn
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118179178A (en) * | 2024-05-17 | 2024-06-14 | 成都伊斯顿过滤器有限公司 | Coal bed gas filter |
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| WO2024051034A1 (en) | 2024-03-14 |
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