CN215798587U - Zero-discharge treatment system for wastewater in biodiesel workshop - Google Patents
Zero-discharge treatment system for wastewater in biodiesel workshop Download PDFInfo
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- CN215798587U CN215798587U CN202122302156.3U CN202122302156U CN215798587U CN 215798587 U CN215798587 U CN 215798587U CN 202122302156 U CN202122302156 U CN 202122302156U CN 215798587 U CN215798587 U CN 215798587U
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Abstract
The utility model relates to a zero-discharge wastewater treatment system for a biodiesel workshop, wherein a raw material input pipe is connected with an inlet of a methanol rectifying tower, the bottom of the methanol rectifying tower is provided with a reboiler, the bottom of the methanol rectifying tower is connected with an inlet of a water distillation tower through a heavy phase extraction pump of the methanol rectifying tower, and a bottom discharge port of the water distillation tower is connected with a crude glycerol output pipe through a crude glycerol extraction pump; the top gas vent of water distillation column links to each other with the shell side entry of methyl alcohol rectifying column reboiler, the shell side gas outlet of methyl alcohol rectifying column reboiler links to each other with the shell side entry of water distillation column condenser, the shell side export of water distillation column condenser communicates with each other with the atmosphere through the draught fan, the condensate export of water distillation column condenser links to each other with the entry of distilled water jar of keeping in, the export of distilled water jar of keeping in links to each other with the top backward flow mouth of distilled water output tube and water distillation column through the output of distilled water delivery pump. The system has low energy consumption, and the distilled water can be used as process soft water, so that zero discharge of waste water in a biodiesel workshop can be realized.
Description
Technical Field
The utility model relates to a biodiesel treatment system, in particular to a biodiesel workshop wastewater zero-discharge treatment system, and belongs to the technical field of biodiesel treatment.
Background
Biodiesel is a clean renewable energy source, and is a liquid fuel prepared from raw materials such as soybean oil, rapeseed oil, palm oil, sunflower seed oil, waste oil and the like. The biodiesel comprises fatty acid methyl ester which can be generated by the reaction of oil and methanol under the action of an alkaline catalyst or by the reaction of fatty acid and methanol under the action of an acid catalyst. Wherein, the transesterification reaction under the action of the alkaline catalyst is the most main reaction, the alkaline catalyst can be sodium methoxide, sodium hydroxide or potassium hydroxide, fatty acid methyl ester after transesterification is washed, centrifugally separated, dried and filtered, and finally the finished product of the biodiesel is obtained.
The heavy phases produced during biodiesel production are mixed together and separated, the heavy phase being derived from the glycerin phase produced during transesterification and the aqueous phase produced during water washing. The heavy phase contains methanol, glycerol, water, salt, soap, etc. In the separation process, the soap is first neutralized by acidification with hydrochloric acid to separate out fatty acids, and then methanol separation and glycerol concentration are carried out. The methanol separation utilizes a normal-pressure packed tower or a plate tower to carry out rectification separation, fresh 3-6bar saturated steam is used as a heat source, and the methanol with the purity of more than 99.7 percent can be obtained from a methanol rectification tower. The main process of glycerol concentration is triple-effect evaporation, saturated water vapor of 3-6bar is used as a heat source of a first effect, the water vapor of the first effect is used as a heat source of a second effect, the water vapor from an evaporator of the last effect enters a vacuum condenser, and condensate of the vacuum condenser and condensate of the second-effect evaporator and condensate of a third-effect evaporator are mixed together and used as wastewater to go to a sewage treatment section.
During the multi-effect evaporation process, a small amount of glycerol is evaporated due to the higher temperature. Part of the glycerol is entrained in the gas-liquid separation process, so that the COD value of the wastewater generated in the multi-effect evaporation process is usually 3000-15000 ppm. The treatment cost, the treatment difficulty and the occupied area of the wastewater with high COD are large in the sewage treatment process. Some enterprises try to separately recover the glycerol in the wastewater in a rectification mode to reduce the COD in the wastewater, but the mode has the defects of high energy consumption and high cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the problems in the prior art and provide a biodiesel workshop wastewater zero-discharge treatment system, the system has low steam consumption, crude glycerol with the purity of more than 80% can be obtained, and the discharged water can be directly used as process soft water without wastewater discharge.
In order to solve the technical problems, the biodiesel workshop wastewater zero-emission treatment system comprises a raw material input pipe, wherein an outlet of the raw material input pipe is connected with an inlet in the middle of a methanol rectifying tower, a reboiler of the methanol rectifying tower is arranged at the bottom of the methanol rectifying tower, a discharge port at the bottom of the methanol rectifying tower is connected with an inlet of a heavy phase extraction pump of the methanol rectifying tower, an outlet of the heavy phase extraction pump of the methanol rectifying tower is connected with a feed inlet of a water distillation tower, a discharge port at the bottom of the water distillation tower is connected with an inlet of a crude glycerol extraction pump, and an outlet of the crude glycerol extraction pump is connected with a crude glycerol output pipe; the top gas vent of water distillation column with the shell side entry of methyl alcohol rectifying column reboiler links to each other, the shell side gas outlet of methyl alcohol rectifying column reboiler links to each other with the shell side entry of water distillation column condenser, the shell side export of water distillation column condenser communicates with each other with the atmosphere through the draught fan, the condensate export of water distillation column condenser links to each other with the entry of distilled water temporary storage tank, the export of distilled water temporary storage tank links to each other with the entry of distilled water delivery pump, the export of distilled water delivery pump links to each other with the top backward flow mouth of distilled water output tube and water distillation column.
As an improvement of the utility model, a tower top gas phase outlet of the methanol rectifying tower is connected with a shell pass inlet of a methanol condenser, a shell pass outlet of the methanol condenser is connected with a vacuum system connecting pipe, a tube pass of the methanol condenser is connected with a circulating water system, a condensate outlet of the methanol condenser is connected with an inlet of a methanol temporary storage tank, an outlet of the methanol temporary storage tank is connected with an inlet of a methanol delivery pump, and an outlet of the methanol delivery pump is connected with a methanol output pipe and a top reflux port of the methanol rectifying tower.
As a further improvement of the utility model, a shell-side condensate outlet of the methanol condenser is connected with an inlet of the distilled water temporary storage tank.
As a further improvement of the utility model, the reboiler of the methanol rectifying tower is a falling film heater or a forced circulation heater, the outlet of the circulating liquid of the methanol rectifying tower is connected with the inlet of the bottom tube pass of the reboiler of the methanol rectifying tower through a forced circulation pump of the methanol rectifying tower, and the outlet of the upper tube pass of the reboiler of the methanol rectifying tower is connected with the inlet of the circulating liquid of the methanol rectifying tower.
As a further improvement of the utility model, the reboiler of the methanol rectifying tower is a thermosyphon heater, the circulating liquid outlet of the methanol rectifying tower is connected with the bottom tube pass inlet of the reboiler of the methanol rectifying tower, and the upper tube pass outlet of the reboiler of the methanol rectifying tower is connected with the circulating liquid inlet of the methanol rectifying tower.
As a further improvement of the utility model, the tower bottom of the water distillation tower is provided with a water distillation tower reboiler, the circulating liquid outlet of the water distillation tower is connected with the bottom tube side inlet of the water distillation tower reboiler through a water distillation tower forced circulation pump, and the upper tube side outlet of the water distillation tower reboiler is connected with the circulating liquid inlet of the water distillation tower.
Compared with the prior art, the utility model has the following beneficial effects:
1. the secondary steam at the top of the water distillation tower is introduced into the shell pass of the reboiler of the methanol rectification tower to be used as a heat source, and the reboiler of the methanol rectification tower does not need to use fresh steam, so that the steam consumption is greatly reduced, and the load of the condenser of the water distillation tower is reduced.
2. The water distillation tower adopts partial reflux, avoids glycerin from being gasified and carried to a water phase, can control the COD value of distilled water to be lower than 100ppm, and can be directly used as process soft water.
3. Compared with the conventional multiple-effect evaporation, the evaporation temperature of the glycerol is reduced and the quality of the crude glycerol is improved by adopting a distillation technology, and the crude glycerol with the purity of more than 80 percent can be obtained at the bottom of the water distillation tower.
Drawings
The utility model will be described in further detail with reference to the following drawings and detailed description, which are provided for reference and illustration purposes only and are not intended to limit the utility model.
FIG. 1 is a flow chart of the zero discharge treatment system for wastewater in a biodiesel plant according to the present invention.
In the figure: C1. a methanol rectifying tower; C2. a water distillation column; r1, a methanol rectifying tower reboiler; r2. a water distillation column reboiler; E1. a methanol condenser; E2. a water distillation column condenser; t1, a methanol temporary storage tank; t2, temporarily storing distilled water; p1, a forced circulation pump of the methanol rectifying tower; p2, a heavy phase extraction pump of the methanol rectifying tower; p3, a methanol delivery pump; p4, a forced circulation pump of the water distillation tower; p5. crude glycerin pump; p6, a distilled water delivery pump; F1. an induced draft fan; G1. a raw material input pipe; G2. a methanol output pipe; G3. a distilled water output pipe; G4. a crude glycerol output pipe; G5. a vacuum system connecting pipe; G6. a raw steam pipe; G7. and a condensed water output pipe.
Detailed Description
As shown in figure 1, the zero-discharge treatment system for wastewater in a biodiesel workshop comprises a raw material input pipe G1, wherein an outlet of the raw material input pipe G1 is connected with a middle inlet of a methanol rectifying tower C1, a methanol rectifying tower reboiler R1 is arranged at the bottom of the methanol rectifying tower C1, a bottom discharge port of the methanol rectifying tower C1 is connected with an inlet of a methanol rectifying tower heavy phase extraction pump P2, an outlet of the methanol rectifying tower heavy phase extraction pump P2 is connected with a feed inlet of a water distillation tower C2, and a water distillation tower reboiler R2 is arranged at the bottom of the water distillation tower C2.
A discharge port at the bottom of the water distillation tower C2 is connected with an inlet of a crude glycerol pump P5, and an outlet of the crude glycerol pump P5 is connected with a crude glycerol output pipe G4; the top exhaust port of the water distillation tower C2 is connected with the shell pass inlet of a methanol distillation tower reboiler R1, the shell pass gas phase outlet of the methanol distillation tower reboiler R1 is connected with the shell pass inlet of a water distillation tower condenser E2, the shell pass outlet of the water distillation tower condenser E2 is communicated with the atmosphere through an induced draft fan F1, the condensate outlet of the water distillation tower condenser E2 is connected with the inlet of a distilled water temporary storage tank T2, the outlet of the distilled water temporary storage tank T2 is connected with the inlet of a distilled water delivery pump P6, and the outlet of the distilled water delivery pump P6 is connected with a distilled water output pipe G3 and the top reflux port of the water distillation tower C2.
The top gas phase outlet of the methanol rectifying tower C1 is connected with the shell pass inlet of the methanol condenser E1, the shell pass outlet of the methanol condenser E1 is connected with the vacuum system connecting pipe G5, and the vacuum system connecting pipe G5 is connected with the suction port of the steam jet pump, the liquid ring vacuum pump or the Roots vacuum pump. The tube pass of the methanol condenser E1 is connected with a circulating water system, a condensate outlet of the methanol condenser E1 is connected with an inlet of a methanol temporary storage tank T1, an outlet of the methanol temporary storage tank T1 is connected with an inlet of a methanol delivery pump P3, and an outlet of the methanol delivery pump P3 is connected with a methanol output tube G2 and a top reflux inlet of a methanol rectifying tower C1.
The shell side condensate outlet of the methanol condenser E1 is connected with the inlet of a distilled water temporary storage tank T2.
The methanol rectifying tower reboiler R1 and the water distillation tower reboiler R2 are one of a falling film heater, a forced circulation heater or a thermosiphon heater, and when the falling film heater or the forced circulation heater is adopted, a forced circulation pump is matched, namely, a circulating liquid outlet of the methanol rectifying tower C1 is connected with a bottom tube pass inlet of the methanol rectifying tower reboiler R1 through the methanol rectifying tower forced circulation pump P1, and an upper tube pass outlet of the methanol rectifying tower reboiler R1 is connected with a circulating liquid inlet of the methanol rectifying tower C1. The circulating liquid outlet of the water distillation column C2 is connected with the bottom tube-side inlet of a water distillation column reboiler R2 through a water distillation column forced circulation pump P4, and the upper tube-side outlet of the water distillation column reboiler R2 is connected with the circulating liquid inlet of the water distillation column C2.
When the methanol rectifying tower reboiler R1 and the water distillation tower reboiler R2 adopt thermosiphon heaters, a forced circulation pump is not matched, namely, a circulating liquid outlet of the methanol rectifying tower C1 is connected with a bottom tube pass inlet of the methanol rectifying tower reboiler R1; the recycle outlet of the water distillation column C2 was connected to the bottom tube side inlet of the water distillation column reboiler R2.
The shell side inlet of a reboiler R2 of the water distillation tower is connected with a raw steam pipe G6, the shell side outlet is connected with a condensed water output pipe G7, and fresh saturated steam is used as a heat source.
The main components of the raw materials entering the raw material input pipe G1 are methanol, water, glycerol, salt and a small amount of fatty acid methyl ester, the methanol with the purity of 90-99.8% can be separated from the top of a methanol rectifying tower C1, the raw materials are condensed by a methanol condenser E1 and then enter a methanol temporary storage tank T1 for storage, and finally the raw materials are sent out by a methanol delivery pump P3, and one path of the raw materials is delivered to a methanol storage tank by a methanol output pipe G2; the other path enters a top reflux opening of a methanol rectifying tower C1. The main components of the bottom heavy phase of the methanol rectifying tower C1 are water, glycerol, salt and a small amount of fatty acid methyl ester,
the condensed water enters a distilled water temporary storage tank T2 and is pumped out by a distilled water delivery pump P6, one path of the condensed water enters a top reflux port of the water distillation tower C2 for circulating spraying, so that the phenomenon that the glycerol is gasified and carried into the water phase is avoided, the COD value of the distilled water is controlled to be lower than 100ppm and can be directly used as process soft water, and the other path of the outlet of the distilled water delivery pump P6 is sent out by a distilled water output pipe G3 to be used as the process soft water.
And (3) discharging a gas phase from a shell pass of a reboiler R1 of the methanol rectifying tower, wherein the gas phase comprises steam and non-condensable gas, the gas phase is further cooled by a condenser E2 of the water distillation tower, the steam is condensed and then enters a distilled water temporary storage tank T2 for collection, and the non-condensable gas and a small amount of steam are pumped out by an induced draft fan F1 and are discharged to the atmosphere.
The main components of the heavy phase obtained from the bottom of the water distillation column C2 are glycerol, salt, a small amount of fatty acid methyl ester and the residual part of water after distillation, wherein the concentration of the glycerol can reach more than 80%, and the glycerol is delivered out by a crude glycerol pump P5 to be sold as crude glycerol or further processed into medical glycerol.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention. Technical features of the present invention which are not described may be implemented by or using the prior art, and will not be described herein.
Claims (6)
1. The utility model provides a biodiesel workshop waste water zero release processing system, includes the raw materials input tube, its characterized in that: the outlet of the raw material input pipe is connected with the middle inlet of the methanol rectifying tower, the bottom of the methanol rectifying tower is provided with a methanol rectifying tower reboiler, the bottom discharge port of the methanol rectifying tower is connected with the inlet of a heavy phase extraction pump of the methanol rectifying tower, the outlet of the heavy phase extraction pump of the methanol rectifying tower is connected with the feed port of the water distillation tower, the bottom discharge port of the water distillation tower is connected with the inlet of a crude glycerol extraction pump, and the outlet of the crude glycerol extraction pump is connected with a crude glycerol output pipe; the top gas vent of water distillation column with the shell side entry of methyl alcohol rectifying column reboiler links to each other, the shell side gas outlet of methyl alcohol rectifying column reboiler links to each other with the shell side entry of water distillation column condenser, the shell side export of water distillation column condenser communicates with each other with the atmosphere through the draught fan, the condensate export of water distillation column condenser links to each other with the entry of distilled water temporary storage tank, the export of distilled water temporary storage tank links to each other with the entry of distilled water delivery pump, the export of distilled water delivery pump links to each other with the top backward flow mouth of distilled water output tube and water distillation column.
2. The biodiesel plant wastewater zero-emission treatment system of claim 1, characterized in that: the top of the tower gas phase outlet of the methanol rectifying tower is connected with the shell pass inlet of the methanol condenser, the shell pass outlet of the methanol condenser is connected with the vacuum system connecting pipe, the tube pass of the methanol condenser is connected with the circulating water system, the condensate outlet of the methanol condenser is connected with the inlet of the methanol temporary storage tank, the outlet of the methanol temporary storage tank is connected with the inlet of the methanol delivery pump, the outlet of the methanol delivery pump is connected with the methanol output pipe and the top reflux port of the methanol rectifying tower is connected with the top reflux port of the methanol rectifying tower.
3. The biodiesel plant wastewater zero-emission treatment system of claim 2, characterized in that: and a shell side condensate outlet of the methanol condenser is connected with an inlet of the distilled water temporary storage tank.
4. The biodiesel plant wastewater zero-emission treatment system of claim 1, characterized in that: the methanol rectifying tower reboiler is a falling film heater or a forced circulation heater, the circulating liquid outlet of the methanol rectifying tower is connected with the bottom tube pass inlet of the methanol rectifying tower reboiler through a forced circulation pump of the methanol rectifying tower, and the upper tube pass outlet of the methanol rectifying tower reboiler is connected with the circulating liquid inlet of the methanol rectifying tower.
5. The biodiesel plant wastewater zero-emission treatment system of claim 1, characterized in that: the methanol rectifying tower reboiler is a thermosyphon heater, a circulating liquid outlet of the methanol rectifying tower is connected with a bottom tube pass inlet of the methanol rectifying tower reboiler, and an upper tube pass outlet of the methanol rectifying tower reboiler is connected with a circulating liquid inlet of the methanol rectifying tower.
6. The biodiesel plant wastewater zero-emission treatment system of claim 1, characterized in that: the tower bottom of the water distillation tower is provided with a water distillation tower reboiler, a circulating liquid outlet of the water distillation tower is connected with a bottom tube pass inlet of the water distillation tower reboiler through a water distillation tower forced circulation pump, and an upper tube pass outlet of the water distillation tower reboiler is connected with a circulating liquid inlet of the water distillation tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122302156.3U CN215798587U (en) | 2021-09-23 | 2021-09-23 | Zero-discharge treatment system for wastewater in biodiesel workshop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122302156.3U CN215798587U (en) | 2021-09-23 | 2021-09-23 | Zero-discharge treatment system for wastewater in biodiesel workshop |
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| Publication Number | Publication Date |
|---|---|
| CN215798587U true CN215798587U (en) | 2022-02-11 |
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| CN202122302156.3U Active CN215798587U (en) | 2021-09-23 | 2021-09-23 | Zero-discharge treatment system for wastewater in biodiesel workshop |
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| CN (1) | CN215798587U (en) |
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- 2021-09-23 CN CN202122302156.3U patent/CN215798587U/en active Active
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