CN210186750U - VOC recovery system and biodiesel production system - Google Patents
VOC recovery system and biodiesel production system Download PDFInfo
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- CN210186750U CN210186750U CN201920768555.9U CN201920768555U CN210186750U CN 210186750 U CN210186750 U CN 210186750U CN 201920768555 U CN201920768555 U CN 201920768555U CN 210186750 U CN210186750 U CN 210186750U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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Abstract
The utility model provides a VOC recovery system, which comprises a condenser, an air cooler, an absorption tower and a fan, wherein the air inlet of the condenser is connected with a VOC-containing waste gas main pipe, the air outlet is connected with an uncondensed gas pipeline, and the uncondensed gas pipeline is communicated to the bottom of the absorption tower; the water outlet of the condenser is connected with one end of a circulating water outlet pipeline, the other end of the circulating water outlet pipeline is connected with the water inlet of the air cooler, the water outlet of the air cooler is connected with one end of a circulating water inlet pipeline, and the other end of the circulating water inlet pipeline is connected with the water inlet of the condenser; the absorption tower is provided with an absorbent circulating pipeline, the inlet end of the absorbent circulating pipeline is connected with the bottom of the absorption tower, the outlet end of the absorbent circulating pipeline enters the upper part of the absorption tower and is connected with a sprayer, and the absorbent circulating pipeline is provided with a circulating pump; the top of the absorption tower is connected with an exhaust pipeline. A biodiesel production system is also provided. The utility model discloses a VOC recovery system is showing the economic nature that has promoted VOC's cyclic utilization and system, and it has important environmental protection meaning.
Description
Technical Field
The utility model relates to a biodiesel technical field, concretely relates to VOC recovery system and biodiesel production system.
Background
Biodiesel is a clean renewable energy source, and is prepared by taking oil crops such as soybean and rapeseed, oil tree fruits such as oil palm or pistacia chinensis bunge, aquatic plants such as engineering algae, animal oil, kitchen waste oil and the like as raw materials and performing esterification and ester exchange reaction. The biodiesel has no toxicity, the degradability is up to 98 percent, the degradation rate is 2 times that of common petroleum diesel, and the biodiesel has good environmental protection characteristic; the cetane number is high, and the anti-knock performance is good; the physical properties of the diesel oil are very close to those of the petroleum diesel oil, so the diesel oil is a high-quality substitute of the petroleum diesel oil.
In the prior art, a biodiesel production system comprises an esterification unit, a transesterification unit and a refining unit. In the esterification and ester exchange reaction units, methanol needs to be excessive (the adding amount of methanol is about 30 percent of the weight of raw oil, the theoretical consumption amount is 11 percent), and an excessive dilute methanol solution is separated after the reaction. And (3) intensively sending the dilute methanol solution to a dilute methanol storage tank, and refining and recovering to obtain methanol with the mass percent of more than 99%, wherein the methanol can be recycled. However, the VOC (methanol and the like) containing waste gas discharged from the esterification and transesterification unit and the methanol recovery and refining unit is usually discharged directly, which results in large methanol consumption, low utilization rate of methanol, low economy, and the VOC waste gas causes air pollution in the plant area and occupational health hazard to operators.
Accordingly, there is a need for an improved biodiesel production system that overcomes the above-mentioned deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
A first object of the utility model is to provide a VOC recovery system to solve VOC and cause the pollution to the environment, the wasting of resources, the economic nature is low, problem that manufacturing cost is high.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a VOC recovery system comprising a condenser, an air cooler, an absorption tower and a fan, wherein:
the gas inlet of the condenser is connected with a VOC-containing waste gas main pipe, the gas outlet of the condenser is connected with a noncondensable gas pipeline, the noncondensable gas pipeline is communicated to the bottom of the absorption tower, and condensate is discharged and recovered from a liquid outlet of the condenser; the water outlet of the condenser is connected with one end of a circulating water outlet pipeline, the other end of the circulating water outlet pipeline is connected with the water inlet of the air cooler, the water outlet of the air cooler is connected with one end of a circulating water inlet pipeline, and the other end of the circulating water inlet pipeline is connected with the water inlet of the condenser;
the absorption tower is provided with an absorbent circulating pipeline, the inlet end of the absorbent circulating pipeline is connected with the bottom of the absorption tower, the outlet end of the absorbent circulating pipeline enters the upper part of the absorption tower and is connected with a sprayer, the absorbent circulating pipeline is provided with a circulating pump, and absorbent is sprayed into the upper part of the absorption tower through the circulating pump; the top of the absorption tower is connected with an exhaust pipeline, and the exhaust pipeline is provided with the fan and is connected to a factory exhaust gas main pipe.
Preferably, the condenser is a shell-and-tube heat exchanger, wherein the circulating water passes through a tube pass, the VOC-containing waste gas passes through a shell pass, an air inlet of the condenser is arranged at the upper part of the condenser, and a liquid outlet of the condenser is arranged at the lower part of the condenser.
Preferably, a first water replenishing pipeline and a waste liquid discharge pipeline are connected to a bottom tower kettle of the absorption tower, the first water replenishing pipeline is from a process water system, and the waste liquid discharge pipeline is connected to a sewage treatment system.
Preferably, the inside of the absorption tower is provided with a filler.
Preferably, three layers of packing are arranged in the absorption tower, and the absorbent circulating pipeline enters the absorption tower and sprays downwards between the uppermost layer of packing and the second layer of packing.
Preferably, the air cooler is also connected with a second water replenishing pipeline, and the second water replenishing pipeline is from a process water system.
According to the utility model discloses, the bottom tower cauldron and the basin intercommunication of absorption tower, the entry of circulating pump with the basin intercommunication.
Preferably, the non-condensable gas pipeline include with the first section pipeline that the condenser is connected, with the second section pipeline that the absorption tower is connected, and with the horn mouth of the end connection of second section pipeline, condenser exhaust non-condensable gas is followed first section pipeline comes out, and follows the horn mouth gets into second section pipeline, and follows the second section pipeline gets into the absorption tower.
Preferably, the circulating pumps are two, one on and one on.
Preferably, the water tank has an opening.
Preferably, a plurality of observation ports are arranged on the absorption tower.
A second object of the present invention is to provide a biodiesel production system, which comprises an esterification unit, an ester exchange unit, a refining unit and the VOC recovery system, wherein:
the esterification unit comprises: the esterification reactor, the separation tank and the dilute methanol storage tank are connected in sequence; the ester exchange unit comprises an esterification reactor and a separation tank which are connected in sequence; the refining unit comprises refining equipment and a methanol storage tank which are connected in sequence, and the separation tank of the ester exchange unit is connected with the refining equipment; the VOC-containing waste gas main pipe is respectively communicated with the breathing port of the dilute methanol storage tank and the breathing port of the methanol storage tank.
The refining equipment can be a rectifying tower or a thin film evaporator, and can also be other refining equipment in the prior art.
Compared with the prior art, the utility model discloses following beneficial technological effect has:
(1) the VOC recovery system of the utility model can effectively recover VOC in VOC-containing waste gas, is beneficial to recycling, and improves the economical efficiency of the system; the air cooler is adopted to cool the circulating water, the cooling effect is good, a circulating water tank is not required to be arranged, the equipment investment is reduced, and the space of a factory building is not required to be occupied; the condenser combines the absorption tower to spray the absorption to the noncondensable gas that the condenser came out, and VOC's absorption efficiency is high, and the VOC waste gas that is not retrieved leads to mill's exhaust gas house steward, is carried to the chimney again and carries out combustion processing for it is perfect to contain VOC exhaust-gas treatment, can not cause the pollution to the factory building environment.
(2) The biodiesel production system provided with the VOC recovery system has the advantages that methanol-containing waste gas generated by the esterification unit and the refining unit is recovered through the VOC recovery system, the recycling of methanol is remarkably promoted, the methanol conversion rate is improved, the economical efficiency of the system is improved, and the factory building environment is not polluted.
Drawings
Fig. 1 is a schematic flow diagram of the VOC recovery system of example 1.
Fig. 2 is a schematic flow diagram of the biodiesel production system of example 2.
In the figure: 10-a condenser, 20-an air cooler, 30-an absorption tower, 40-a VOC-containing waste gas main pipe, 50-an uncondensed gas pipeline, 60-a circulating water outlet pipeline, 70-a circulating water inlet pipeline, 80-an absorbent circulating pipeline, 81-a sprayer, 82-a circulating pump, 90-an exhaust pipeline, 100-a fan and 110-a solvent storage tank;
11-an air inlet of a condenser, 12-a liquid outlet of the condenser, 21-a second water replenishing pipeline, 31-a first water replenishing pipeline, 32-a waste liquid discharge pipeline, 33-a filler, 34-a water tank, 51-a first section of pipeline, 52-a second section of pipeline and 53-a bell mouth;
100-VOC recovery system, 200-esterification unit, 300-ester exchange unit, 400-rectification unit.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings by way of specific embodiments. It should be understood that the following examples are illustrative only and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a VOC recovery system including a condenser 10, an air cooler 20, an absorption tower 30, and a fan 100, wherein:
an air inlet of the condenser 10 is connected with a VOC-containing waste gas main pipe 40, an air outlet is connected with an uncondensed gas pipeline 50, the uncondensed gas pipeline 50 is communicated to the bottom of the absorption tower 30, and condensed liquid is discharged from a liquid outlet of the condenser 10 to a solvent storage tank 110 to recover the solvent; the one end of circulating water outlet pipe way 60 is connected to the delivery port of condenser 10, the other end of circulating water outlet pipe way 60 is connected the water inlet of air cooler 20, the one end of circulating water inlet pipe way 70 is connected to the delivery port of air cooler 20, the other end of circulating water inlet pipe way 70 is connected the water inlet of condenser 10.
The absorption tower 30 is provided with an absorbent circulating pipeline 80, the inlet end of the absorbent circulating pipeline 80 is connected with the bottom of the absorption tower 30, the outlet end of the absorbent circulating pipeline 80 enters the upper end of the absorption tower 30 and is connected with a sprayer 81, the absorbent circulating pipeline 80 is provided with a circulating pump 82, and absorbent is sprayed into the upper part of the absorption tower 30 through the circulating pump 82; the top of the absorption tower 30 is connected with an exhaust pipeline 90, and the exhaust pipeline 90 is provided with the fan 100 and is connected to a factory exhaust gas main.
The VOC recovery system of the utility model can effectively recover VOC in VOC-containing waste gas, is beneficial to recycling, and improves the economical efficiency of the system; the air cooler is adopted to cool the circulating water, the cooling effect is good, a circulating water tank is not required to be arranged, the equipment investment is reduced, and the space of a factory building is not required to be occupied; the condenser combines the absorption tower to spray the absorption to the noncondensable gas that the condenser came out, and VOC's absorption efficiency is high, and the VOC waste gas that is not retrieved leads to mill's exhaust gas house steward, is carried to the chimney again and carries out combustion processing for it is perfect to contain VOC exhaust-gas treatment, can not cause the pollution to the factory building environment.
Preferably, the condenser 10 is a shell and tube heat exchanger, wherein the circulating water flows through a tube side, the VOC-containing waste gas flows through a shell side, an air inlet 11 of the condenser is arranged at the upper part of the condenser 10, and a liquid outlet 12 of the condenser is arranged at the lower part of the condenser 10. Above-mentioned setting, the shell side is walked to the medium that needs the condensation, and the tube side is walked to the circulating water, and the heat exchange efficiency of condenser is high, and the condensation that contains the VOC waste gas is effectual, can furthest with the VOC condensation for solvent recovery.
Preferably, a first water replenishing pipeline 31 and a waste liquid discharge pipeline 32 are connected to the bottom kettle of the absorption tower 30, the first water replenishing pipeline 31 is from a process water system, and the waste liquid discharge pipeline 32 is connected to a sewage treatment system.
When the absorption liquid in the absorption tower circulates to a certain degree, the VOC gas in the absorption liquid gradually tends to saturation, the absorption power is reduced, a certain amount of waste absorbent needs to be discharged to a sewage treatment system, and a certain amount of fresh absorbent needs to be supplemented. Part of the absorbent is discharged through the waste liquid discharge pipe 32 while the first water replenishing pipe 31 replenishes process water to improve absorption efficiency.
Further preferably, the absorbent is lye. The base in solid form may be added to the bottom of the column, such as the absorber.
Preferably, the inside of the absorption tower 30 is installed with packing 33.
The absorbent sprays from the upper part of the absorption tower, and is in gas-liquid countercurrent contact with VOC-containing waste gas rising from the bottom of the absorption tower through the packing layer, so that the contact area is large, and the absorption efficiency is high. The filler may be a filler conventionally used in the art.
Preferably, three layers of packing are arranged inside the absorption tower, and the absorbent circulating pipeline 80 enters the inside of the absorption tower 30 and sprays downwards between the uppermost layer of packing and the second layer of packing.
Preferably, a second water supply pipeline 21 is further connected to the air cooler 20, and the second water supply pipeline 21 is from a process water system.
According to the utility model discloses, the bottom tower cauldron of absorption tower 30 communicates with basin 34, the entry of circulating pump 82 with basin 34 communicates. The absorbent dropped to the bottom tower bottom of the absorption tower 30 enters the water tank 34, and is pumped into the upper part of the absorption tower 30 by the circulating pump 82 for circulating spraying.
Preferably, the uncondensed gas pipe 50 includes a first pipe section 51 connected to the condenser, a second pipe section 52 connected to the absorption tower 30, and a bell mouth 53 connected to an end of the second pipe section 52. The uncondensed gas discharged from the condenser 30 exits along the first section of the pipe 51, enters the second section of the pipe 52 from the flared pipe 53, and enters the absorption tower 30 along the second section of the pipe 52.
The arrangement can ensure that the uncondensed gas smoothly enters the absorption tower, but cannot influence the operation of the condenser, so that the long-term smooth operation of the system can be ensured.
Preferably, there are two circulation pumps 82, one on and one on. By the arrangement, when one circulating pump breaks down and needs to be maintained, the standby pump can be started, so that the long-term operation of the recovery system is effectively ensured, and the recovery efficiency is ensured.
Preferably, the water tank 34 has an opening. When the absorbent adopts alkali liquor, solid alkali can be poured from the opening, and the operation is very simple.
Preferably, the absorption tower 30 is provided with a plurality of observation ports (not shown). The concrete condition in the absorption tower can be observed through the observation port, the timely correction operation when abnormal working conditions occur is facilitated, and the normal operation of the recovery system is effectively ensured.
In the VOC recovery system of this embodiment, the fan operates to make the second section of pipeline 52 and the exhaust pipe 90 connected to the absorption tower generate negative pressure in the absorption tower, and the noncondensable gas enters the absorption tower 30 through the first section of pipeline 51 and the second section of pipeline 52 under the action of the negative pressure, and is discharged to the factory exhaust gas main pipe from the top of the absorption tower 30 along the exhaust pipe 90.
Example 2
As shown in fig. 2, the present embodiment provides a biodiesel production system, including an esterification unit 200, a transesterification unit 300, a rectification unit 400, and the VOC recovery system 100 of embodiment 1.
The esterification unit 200 includes: the device comprises a primary esterification reactor, a primary separation tank, a secondary esterification reactor, a secondary separation tank and 2 diluted methanol storage tanks, wherein the primary esterification reactor, the primary separation tank, the secondary esterification reactor and the secondary separation tank are sequentially connected, and the 2 diluted methanol storage tanks are respectively connected with the primary separation tank and the secondary separation tank.
The transesterification unit 300 includes: a transesterification reactor and a transesterification separating tank which are connected in sequence.
The rectifying unit 400 includes a rectifying tower and a methanol storage tank connected in sequence.
The first-stage separation tank and the second-stage separation tank are respectively connected with the ester exchange reactor, and the ester exchange separation tank is connected with the rectifying tower.
The VOC-containing waste gas main pipe is respectively communicated with the 2 breathing ports of the dilute methanol storage tanks of the esterification unit and the breathing ports of the methanol storage tanks of the rectification unit.
The biodiesel production system who has installed above-mentioned VOC recovery system, the waste gas that contains methyl alcohol that esterification unit and rectification unit produced passes through the utility model discloses a VOC recovery system retrieves, is showing the cyclic utilization who has promoted methyl alcohol, has improved the methyl alcohol conversion rate, and the economic nature of system improves, and can not cause the pollution to the factory building environment.
In this embodiment, for the biodiesel production system, the contained VOC is mainly methanol, and the absorbent used may be pure water or an alkaline absorbent. Preferably an alkaline absorbent. In the alkaline absorbent, alkali liquor, namely sodium hydroxide aqueous solution, is used more conventionally.
Of course, those skilled in the art and others will appreciate that the VOC recovery system may also be used for the recovery of other VOC containing waste gases.
With reference to fig. 2, the working method of the present invention is as follows: the methanol-containing waste gas generated by the esterification unit 200 and the rectification unit 400 is collected into a VOC-containing waste gas main pipe, condensed by the condenser 10, and condensed solvent is discharged and recovered from a liquid outlet 12 of the condenser for recycling. The uncondensed gas enters the bottom of the absorption tower 30 along the uncondensed gas pipeline 50 and is absorbed by the absorption liquid sprayed from the top of the absorption tower in a counter-current mode, and the unabsorbed waste gas is discharged into a chimney.
The condenser 10 adopts circulating water for condensation, the circulating water is arranged in a closed loop, and the circulating water from the circulating water outlet pipeline 60 enters the condenser 10 for circulating condensation along the circulating water inlet pipeline 70 after being cooled by the air cooler 20.
In the application example, the total air volume of the VOC-containing waste gas main pipe is 800m3The diameter is DN200, the diameters of the circulating water outlet pipeline 60 and the circulating water inlet pipeline 70 are DN25, the diameter of the first water replenishing pipeline is DN25, the diameter of the waste liquid discharge pipeline 32 is DN40, the diameter of the second section of pipeline 52 is DN200, and the diameter of the exhaust pipeline is DN 200.
By adopting the production system of the embodiment 2, the VOC-containing waste gas discharged in the production process is not directly discharged any more, but is recycled and effectively treated, the economy is improved, no peculiar smell is generated in a factory, and the production environment is greatly improved.
It is easily understood by those skilled in the art that the VOC recovery system of example 1 can also be applied to other biodiesel production systems, and the purpose of effectively recovering VOC can also be achieved. For example, in a refining unit in a production system of part of biodiesel, a thin film evaporator is adopted for thin film evaporation dealcoholization instead of rectification tower dealcoholization.
The present invention has been described in detail with reference to the specific embodiments, but the present invention is only by way of example and is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are intended to be within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (10)
1. The utility model provides a VOC recovery system which characterized in that, includes condenser, air cooler, absorption tower and fan, wherein:
the gas inlet of the condenser is connected with a VOC-containing waste gas main pipe, the gas outlet of the condenser is connected with a noncondensable gas pipeline, the noncondensable gas pipeline is communicated to the bottom of the absorption tower, and condensate is discharged and recovered from a liquid outlet of the condenser; the water outlet of the condenser is connected with one end of a circulating water outlet pipeline, the other end of the circulating water outlet pipeline is connected with the water inlet of the air cooler, the water outlet of the air cooler is connected with one end of a circulating water inlet pipeline, and the other end of the circulating water inlet pipeline is connected with the water inlet of the condenser;
the absorption tower is provided with an absorbent circulating pipeline, the inlet end of the absorbent circulating pipeline is connected with the bottom of the absorption tower, the outlet end of the absorbent circulating pipeline enters the upper part of the absorption tower and is connected with a sprayer, the absorbent circulating pipeline is provided with a circulating pump, and absorbent is sprayed into the upper part of the absorption tower through the circulating pump; the top of the absorption tower is connected with an exhaust pipeline, and the exhaust pipeline is provided with the fan and is connected to a factory exhaust gas main pipe.
2. The VOC recovery system of claim 1 wherein the condenser is a shell and tube heat exchanger in which the circulating water is circulated on the tube side and the VOC-containing waste gas is circulated on the shell side, the air inlet of the condenser being disposed above the condenser and the liquid outlet of the condenser being disposed below the condenser.
3. The VOC recovery system of claim 1, wherein a first water replenishing pipeline and a waste liquid discharge pipeline are connected to the bottom kettle of the absorption tower, the first water replenishing pipeline is from a process water system, and the waste liquid discharge pipeline is connected to a sewage treatment system.
4. A VOC recovery system as claimed in claim 1, wherein the interior of the absorber tower is packed with packing.
5. The VOC recovery system of claim 4 wherein three layers of packing are disposed within said absorber, said absorbent circulation line entering the interior of said absorber and spraying downwardly between the uppermost layer of packing and the second layer of packing.
6. The VOC recovery system of claim 1 wherein a second make-up water conduit is also connected to said air cooler, said second make-up water conduit being from a process water system.
7. The VOC recovery system of claim 1 wherein the bottom drum of the absorber is in communication with a water tank and the inlet of the circulation pump is in communication with the water tank.
8. The VOC recovery system of claim 1 wherein the non-condensable gas conduits include a first section of conduit connected to the condenser, a second section of conduit connected to the absorber tower, and a flare connected to an end of the second section of conduit; and the uncondensed gas discharged by the condenser comes out along the first section of pipeline, enters the second section of pipeline from the bell mouth and enters the absorption tower along the second section of pipeline.
9. A VOC recovery system as claimed in any of claims 1-8, wherein there are two circulation pumps, one on and one on.
10. A biodiesel production system, comprising an esterification unit, a transesterification unit, a refining unit, and a VOC recovery system of any of claims 1-8 connected in series, wherein:
the esterification unit comprises: the esterification reactor, the separation tank and the dilute methanol storage tank are connected in sequence; the ester exchange unit comprises an esterification reactor and a separation tank which are connected in sequence; the refining unit comprises refining equipment and a methanol storage tank which are connected in sequence, and the separation tank of the ester exchange unit is connected with the refining equipment; the VOC-containing waste gas main pipe is respectively communicated with the dilute methanol storage tank and the methanol storage tank.
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| CN201920768555.9U CN210186750U (en) | 2019-05-27 | 2019-05-27 | VOC recovery system and biodiesel production system |
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| CN201920768555.9U CN210186750U (en) | 2019-05-27 | 2019-05-27 | VOC recovery system and biodiesel production system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386432A (en) * | 2022-07-29 | 2022-11-25 | 湖南诺睿信生物科技有限公司 | System for producing biodiesel by using double enzymes and production method thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386432A (en) * | 2022-07-29 | 2022-11-25 | 湖南诺睿信生物科技有限公司 | System for producing biodiesel by using double enzymes and production method thereof |
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