CN217472755U - Automatic control device for flash evaporation dealcoholization working solution distillation of biodiesel - Google Patents

Abstract

The utility model discloses a biodiesel flash distillation dealcoholization working solution distillation automatic control device, which comprises a flash tower, a plate condenser, a working liquid separator with an intermediate partition plate, a working liquid tank, three working liquid pumps, a working liquid receiving tank, a water ring vacuum pump, a distillation still, a distillation tower, a digital display thermometer, a methanol condenser, a tail gas condenser, a digital display pressure transmitter, a methanol recovery tank, a temperature pressure automatic control system, a wastewater tank, a pipeline and a valve; the automatic temperature and pressure control system comprises a temperature and pressure regulating valve TpV, a digital display thermometer with a temperature sensor, a digital display pressure transmitter with a pressure sensor, a program control system PLC, a computer and an electric control cabinet, wherein the automatic temperature and pressure control system is connected with the digital display thermometer and the digital display pressure transmitter through signal lines, and the PLC is connected with the temperature and pressure regulating valve TPV, the digital display thermometer and the digital display pressure transmitter through signal lines. The utility model discloses convenient operation, safe and reliable, product quality are stable.

Description

Automatic control device for flash evaporation dealcoholization working solution distillation of biodiesel

Technical Field

The utility model relates to an utilize waste oil production biodiesel's equipment technical field, concretely relates to biodiesel flash distillation dealcoholize working solution distillation automatic control device.

Background

Domestic biodiesel production enterprises mainly take waste oil as a raw material, a fatty acid methyl ester crude product is generated by an esterification and ester exchange two-step chemical method, the crude methyl ester enters low-boiling-point substances such as falling film flash evaporation dehydration and methanol, then the crude methyl ester is heated to 250 ℃ by heat conduction oil, enters a biodiesel distillation tower, and qualified products are obtained from different distillation towers respectively according to different boiling points under the negative pressure of-0.05 MPa. The working liquid after condensation of vacuum tail gas from the middle upper part of the flash tower contains methanol, water, low-boiling-point substances and the like. The distillation flash distillation dealcoholization device mainly comprises a flash tower, a condenser and a water ring vacuum pump, wherein the condensed working solution is pumped into a working solution tank from a working solution receiving tank, and then is pumped into a distillation kettle from the working solution tank to distill out methanol. Usually, the steam valve of the distillation kettle is manually adjusted when working solution is evaporated, so that the quality of the recovered methanol is ensured. The existing defects are that: on the one hand, the working solution pumped down by the water ring vacuum pump is too much, an operator frequently pumps away the working solution of the receiving tank, and in addition, the operator frequently adjusts the steam valve to have low working efficiency due to the fact that the temperature of the methanol cannot be accurately controlled on time when the working solution is steamed, and potential safety hazards can be caused when the cooling water is not timely stopped when the water is accidentally stopped when the working solution is steamed.

Disclosure of Invention

The utility model aims at providing a biodiesel flash distillation dealcoholize working solution distillation automatic control device realizes safe, the efficient working solution that separates when handling biodiesel distillation flash distillation dealcoholize, convenient operation, safe and reliable, product quality are stable when evaporating the working solution simultaneously.

In order to achieve the purpose, the utility model discloses biodiesel flash distillation dealcoholization working solution distillation automatic control device includes flash column 1, plate condenser 2, working solution separator intermediate bottom 3, working solution separator 4, working solution jar 5, No. 1 working solution pump 6, working solution receiving tank 7, water ring vacuum pump 8, No. 2 working solution pump 9, stills 10, distillation column 11, digital display thermometer 12, methanol condenser 13, tail gas condenser 14, digital display pressure transmitter 15, retrieve methanol tank 16, temperature pressure automatic control system 17, No. 3 working solution pump 18, waste water tank 19 and connecting tube and valve; the automatic temperature and pressure control system 17 comprises a temperature and pressure regulating valve TpV, a digital display thermometer 12 with a temperature sensor, a digital display pressure transmitter 15 with a pressure sensor, a program control system PLC, a computer and an electric control cabinet, wherein the automatic temperature and pressure control system 17 is connected with the digital display thermometer 12 and the digital display pressure transmitter 15 through signal lines, and the PLC is connected with the temperature and pressure regulating valve TPV, the digital display thermometer 12, the digital display pressure transmitter 15 and the computer through signal lines; a plate condenser cooling water outlet e is arranged at the upper part of the left side of the plate condenser 2, a plate condenser cooling water inlet g is arranged at the lower part of the left side, a plate condenser vapor phase inlet d is arranged at the upper part of the left side, and a plate condenser working solution outlet f is arranged at the lower part of the left side; a middle partition plate with the height of 1.5 meters is arranged at the middle upper part in the working liquid separator 4, a working liquid separator vacuum outlet pipe i is arranged at the position, 0.35 meter away from the middle partition plate, of the right side of the top, a working liquid separator working liquid inlet h is arranged at the position, 0.35 meter away from the middle partition plate, of the left side of the top, a working liquid separator working liquid outlet j is arranged at the lower part, and a sight glass is arranged at the working liquid outlet j of the working liquid separator to facilitate observation of separation effects; the right side of the top of the working liquid receiving tank 7 is provided with a working liquid receiving tank vacuum tail gas outlet pipe Z1, the left side of the top is provided with a working liquid receiving tank inlet pipe Z2, the left side of the lower part is provided with a working liquid receiving tank outlet pipe Z4, and the right side of the lower part is provided with a working liquid receiving tank circulating pipe Z3; a distillation kettle working solution inlet k is formed in the top of the distillation kettle 10 close to the edge, a distillation kettle methanol gas outlet l is formed in the center of the top of the distillation kettle 10 close to the edge, a distillation kettle return pipe m is further formed in the top of the distillation kettle 10 close to the edge, a distillation kettle discharge port pipe n1 is formed in the center of the bottom of the distillation kettle 10, a steam heating coil pipe is arranged in the distillation kettle 10, a steam inlet pipe n2 is formed in the top of the distillation kettle 10 close to the edge, a steam outlet pipe n3 is formed in the bottom of the distillation kettle 10 close to the other side of the edge, a steam inlet pipe n2 is connected with a temperature and pressure regulating valve TPV pipeline, and a manual valve is additionally arranged to serve as a bypass; a distillation tower methanol gas outlet pipe x2 is arranged at the center of the top of the distillation tower 11, and a digital display thermometer 12 with a temperature sensor is arranged behind the distillation tower methanol gas outlet pipe x 2; a distillation tower methanol reflux inlet pipe y1 is arranged on the side surface of the upper part of the distillation tower 11, a distillation tower reflux outlet pipe y2 is arranged at the center of the bottom of the distillation tower 11, and a distillation tower methanol gas inlet pipe x1 is arranged on the side surface of the bottom; a methanol condenser cooling water outlet q is formed in the left side of the top of the methanol condenser 13, and a methanol condenser cooling water inlet o is formed in the lower portion of the right side of the top of the methanol condenser; a main pipe in front of the pressure transmitter is provided with a digital display pressure transmitter 15, the right side of the top of the methanol condenser is provided with a methanol condenser methanol gas outlet r, the upper part of the left side is provided with a methanol condenser methanol gas inlet p, and the center of the bottom is provided with a methanol condenser methanol outlet s; a tail gas condenser cooling water outlet v2 is arranged on the left side of the top of the tail gas condenser 14, a tail gas condenser cooling water inlet v1 is arranged on the lower portion of the right side of the tail gas condenser 14, a tail gas condenser noncondensable gas outlet u is arranged on the right side of the top of the tail gas condenser, a tail gas condenser methanol gas inlet t is arranged on the upper portion of the left side of the tail gas condenser, and a tail gas condenser methanol outlet w is arranged in the center of the bottom of the tail gas condenser; a vacuum outlet b of the flash tower is connected with a vapor phase inlet d of the plate condenser through a pipeline, a working liquid outlet f of the plate condenser is connected with a working liquid inlet h of the working liquid separator through a pipeline, a working liquid outlet j of the working liquid separator is connected with the top of the working liquid tank 5 through a pipeline, a vacuum outlet pipe i of the working liquid separator is sequentially connected with the water ring vacuum pump 8 and a working liquid receiving groove inlet pipe Z2 through pipelines, an outlet pipe Z4 of the working liquid receiving groove is connected with the No. 1 working liquid pump 6 through a pipeline and then connected to the top of the working liquid tank 5, a circulating pipeline is arranged between the water ring vacuum pump 8 and the working liquid receiving groove 7, and a working liquid circulating pipe receiving groove Z3 is connected with the water ring vacuum pump 8; the bottom outlet of the working liquid tank 5 is connected with a working liquid pump 9 No. 2 and then connected with one side of the top of the distillation kettle 10, the middle pipeline of the top of the distillation kettle 10 is connected with a methanol gas inlet pipe x1 of the distillation tower, the methanol gas outlet pipe x2 of the distillation tower is connected with a methanol gas inlet p of the methanol condenser, one pipeline of a methanol outlet s of the methanol condenser is connected with a methanol recovery tank 16, and the other pipeline of the methanol outlet s of the methanol condenser is connected with a valve and then is connected with a methanol reflux inlet pipe y1 of the distillation tower; a methanol gas outlet r of the methanol condenser is connected with a methanol gas inlet t of the tail gas condenser; a reflux outlet pipe y2 of the distillation tower is connected with the other side of the top of the distillation kettle 10; the discharging pipe n1 of the distillation still is connected with the No. 3 working solution pump 18 and the waste water tank 19 in sequence.

The upper control computer of the automatic temperature and pressure control system is internally provided with Tianhong industrial configuration software V1.0, the software system is used for displaying, recording and controlling data of each process point, a software development merchant is Tianhong computer technology company Limited in Longyan city, the time to market is 2018 and 5 months, and the software development merchant belongs to the prior art; the PLC of the program control system is developed by Tianhong computer technology limited company in Longyan city, the brand of the PLC is Siemens, the CPU and the acquisition control module of the PLC system are S7-1200 series general products of Siemens, and the PLC software program is compiled by the Tianhong computer technology limited company in Longyan city according to requirements. All software and hardware with computer programs are commercially available prior art.

The automatic control device for flash evaporation dealcoholization working solution distillation of biodiesel with the structure has the following technical characteristics and beneficial effects:

1. the working liquid separator can well separate methanol and low-boiling-point substances, and the methanol and the low-boiling-point substances automatically flow to the working liquid tank by utilizing the height difference, so that the working liquid amount of the vacuum water ring pump is greatly reduced, the vacuum degree of the vacuum water ring pump is improved, the labor intensity of operators is reduced, and the safety accident caused by the fact that the working liquid tank is full of liquid is reduced;

2. the automatic control of the temperature of the methanol in the distillation kettle is increased, so that the quality of the recovered methanol can be well ensured, and the labor intensity of operators is reduced;

3. the automatic control of the pressure of the cooling water in the distillation kettle is increased, so that the safe operation of production can be well guaranteed;

4. the equipment has simple structure and simple and convenient operation.

Drawings

FIG. 1 is a schematic structural view of an automatic control device for flash distillation and dealcoholization of biodiesel according to the present invention.

Fig. 2 is an enlarged schematic view of the flash column of fig. 1.

Fig. 3 is an enlarged schematic view of the plate condenser in fig. 1.

Fig. 4 is an enlarged schematic view of the working liquid separator of fig. 1.

FIG. 5 is an enlarged schematic view of the distillation still, methanol condenser, temperature control system, and pressure control system of FIG. 1.

Fig. 6 is an enlarged schematic view of the offgas condenser of fig. 1.

FIG. 7 is an enlarged schematic view of the distillation column of FIG. 1.

Fig. 8 is an enlarged schematic view of the working fluid bath of fig. 1.

Reference numerals: the system comprises a flash tower 1, a plate type condenser 2, a working liquid separator intermediate baffle 3, a working liquid separator 4, a working liquid tank 5, a working liquid pump 1, a working liquid receiving tank 7, a water ring vacuum pump 8, a working liquid pump 2, a distillation still 10, a distillation tower 11, a digital display thermometer 12, a methanol condenser 13, a tail gas condenser 14, a digital display pressure transmitter 15, a methanol recovery tank 16, a temperature and pressure automatic control system 17, a working liquid pump 3 18 and a waste water tank 19. A flash tower crude methyl ester feeding hole a, a flash tower vacuum outlet b, a flash tower crude methyl ester outlet c, a plate condenser vapor phase inlet d, a plate condenser cooling water outlet e, a plate condenser working solution outlet f, a plate condenser cooling water inlet g, a working solution separator working solution inlet h, a working solution separator vacuum outlet pipe i, a working solution separator working solution outlet j, a distillation kettle working solution inlet k, a distillation kettle methanol gas outlet l, a distillation kettle return pipe m, a distillation kettle discharging port pipe n1, a steam inlet pipe n2, a steam outlet pipe n3, a methanol condenser cooling water inlet O, a methanol condenser methanol gas inlet p, a methanol condenser cooling water outlet q, a methanol condenser methanol gas outlet r, a methanol condenser methanol outlet s, a tail gas condenser methanol gas inlet t, a tail gas condenser noncondensable gas outlet u, a tail gas condenser cooling water inlet v1, A cooling water outlet V2 of the tail gas condenser, a methanol outlet w of the tail gas condenser, a methanol gas inlet pipe x1 of the distillation tower, a methanol gas outlet pipe x2 of the distillation tower, a methanol reflux inlet pipe y1 of the distillation tower, a reflux outlet pipe y2 of the distillation tower, a vacuum tail gas outlet pipe Z1 of the working liquid receiving tank, an inlet pipe Z2 of the working liquid receiving tank, a circulating pipe Z3 of the working liquid receiving tank, an outlet pipe Z4 of the working liquid receiving tank, T-temperature, P-pressure, I-display, V-adjusting valve, C-control and A-alarm.

Detailed Description

The automatic control device for flash evaporation dealcoholization working solution distillation of biodiesel of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-8, the automatic distillation control device for biodiesel oil flash evaporation dealcoholization working solution of the present invention comprises a flash tower 1, a plate condenser 2, a working solution separator intermediate baffle 3, a working solution separator 4, a working solution tank 5, a working solution pump 6 No. 1, a working solution receiving tank 7, a water ring vacuum pump 8, a working solution pump 9 No. 2, a distillation still 10, a distillation tower 11, a digital display thermometer 12, a methanol condenser 13, a tail gas condenser 14, a digital display pressure transmitter 15, a methanol recovery tank 16, an automatic temperature pressure control system 17, a working solution pump 18 No. 3, a wastewater tank 19, and a connecting pipeline and a valve; the automatic temperature and pressure control system 17 comprises a temperature and pressure regulating valve TpV, a digital display thermometer 12 with a temperature sensor, a digital display pressure transmitter 15 with a pressure sensor, a program control system PLC, a computer and an electric control cabinet, wherein the automatic temperature and pressure control system 17 is connected with the digital display thermometer 12 and the digital display pressure transmitter 15 through signal lines, and the PLC is connected with the temperature and pressure regulating valve TPV, the digital display thermometer and the digital display pressure transmitter and the computer through signal lines; the upper part of the left side of the plate type condenser 2 is provided with a plate type condenser cooling water outlet e, the lower part of the left side is provided with a plate type condenser cooling water inlet g, the upper part is provided with a plate type condenser vapor phase inlet d, and the lower part is provided with a plate type condenser working solution outlet f; a middle clapboard with the height of 1.5 meters is arranged at the middle upper part in the working liquid separator 4, the middle clapboard enables non-condensable gas in working liquid to flow in a U shape in the separator, which is beneficial to the separation of methanol, low-boiling ester and non-condensable gas, a working liquid separator vacuum outlet pipe i is arranged at the position of the right part of the top part, which is 0.35 meters away from the middle clapboard, a working liquid separator working liquid inlet h is arranged at the position of the left part of the top part, a working liquid separator working liquid outlet j is arranged at the lower part, the methanol and low-boiling-point substance condensate are separated for the second time, the content of the methanol and the low-boiling-point substance condensate in tail gas is further reduced, the separated methanol and the low-boiling-point substance condensate automatically flow to the working liquid tank 5 by utilizing high level, a sight glass is arranged at the outlet pipe j to facilitate the observation of the separation effect, the content of the methanol and the low-boiling-point condensate in the tail gas entering the vacuum pump 8 is further reduced, the vacuum pump 8 can be improved, which is beneficial to the distillation production of biodiesel, in addition, the working fluid pumped down by the vacuum pump 8 is greatly reduced, and an operator does not need to frequently pump more working fluid, so that the safety accidents caused by the fact that the working fluid tank is full of fluid are reduced; the right side of the top of the working liquid receiving tank 7 is provided with a working liquid receiving tank vacuum tail gas outlet pipe Z1, the left side of the top is provided with a working liquid receiving tank inlet pipe Z2, the left side of the lower part is provided with a working liquid receiving tank outlet pipe Z4, and the right side of the lower part is provided with a working liquid receiving tank circulating pipe Z3; a distillation kettle working solution inlet k is formed in the position, close to the edge, of the top of the distillation kettle 10, a distillation kettle methanol gas outlet l is formed in the center of the top of the distillation kettle 10, and is used for enabling methanol gas generated after heating to enter a distillation tower for methanol distillation, a distillation kettle return pipe m is further arranged in the position, close to the edge, of the top of the distillation kettle 10, a distillation kettle discharge port pipe n1 is formed in the center of the bottom of the distillation kettle 10, a steam heating coil is arranged in the distillation kettle 10, a steam inlet pipe n2 is arranged in the position, close to the edge, of the top of the distillation kettle 10, a steam outlet pipe n3 is arranged on the other side, close to the edge, of the bottom of the distillation kettle 10, a steam inlet pipe n2 is connected with a temperature pressure regulating valve TPV pipeline, a bypass is additionally arranged, and the steam heating coil is used for regulating the temperature in the distillation kettle 10 by introducing steam to enable the set temperature of the methanol gas at the top of the distillation tower 11 to be in accordance with the set temperature so as to facilitate recovery of the methanol meeting the quality requirement; a methanol gas outlet pipe x2 of the distillation tower is arranged at the center of the top of the distillation tower 11, and a digital display thermometer 12 with a temperature sensor is arranged behind the outlet pipe; a distillation tower methanol reflux inlet pipe y1 is arranged on the side surface of the upper part of the distillation tower 11 and is used for adjusting the methanol recovery amount of the distillation tower, a distillation tower reflux outlet pipe y2 is arranged at the center of the bottom of the distillation tower 11, and a distillation tower methanol gas inlet pipe x1 is arranged on the side surface of the bottom; a methanol condenser cooling water outlet q is formed in the left side of the top of the methanol condenser 13, and a methanol condenser cooling water inlet o is formed in the lower portion of the right side of the top of the methanol condenser; a main pipe in front of the pressure transmitter is provided with a digital display pressure transmitter 15, the right side of the top of the methanol condenser is provided with a methanol condenser methanol gas outlet r, the upper part of the left side is provided with a methanol condenser methanol gas inlet p, and the center of the bottom is provided with a methanol condenser methanol outlet s; according to the requirements of an ester exchange process, the water content of recovered methanol is less than or equal to 0.8 percent, the temperature of methanol vapor at the top of a distillation tower 11 is controlled between 63 and 64.5 ℃, the water content of methanol is less than or equal to 0.8 percent, the temperature in a distillation kettle 11 changes along with the change of the methanol content in the process of distilling working solution, if the methanol content of the working solution is high and the steam consumption is large at the beginning of distillation, the temperature of the methanol vapor at the top of the distillation tower 11 can be controlled between 63 and 64.5 ℃ along with the reduction of the methanol content and the reduction of the steam consumption; the working principle of the temperature and pressure automatic control system 17 is that a methanol vapor temperature limit value at the top of the distillation tower 11 is set, a temperature sensor sends a signal to a PLC, a temperature and pressure regulating valve TpV is opened automatically, the distillation of working solution is started by automatically regulating the size of a vapor valve, when the working solution methanol in the distillation kettle 11 is recovered, the temperature and pressure automatic control system is closed, the vapor pneumatic regulating valve 11 is closed automatically to stop heating (the pneumatic regulating valve is sensitive to an electric regulating valve), if the cooling water pressure in the working solution distillation process cannot reach the requirement, the vapor pneumatic regulating valve 11 is closed automatically to stop heating, and an alarm is given out to prevent a large amount of methanol vapor from being mixed out from a non-condensable gas outlet u of the tail gas condenser 14 to cause potential safety hazards; a tail gas condenser cooling water outlet v2 is arranged on the left side of the top of the tail gas condenser 14, a tail gas condenser cooling water inlet v1 is arranged on the lower portion of the right side, a tail gas condenser noncondensable gas outlet u is arranged on the right side of the top, a tail gas condenser methanol gas inlet t is arranged on the upper portion of the left side, and a tail gas condenser methanol outlet w is arranged in the center of the bottom; a flash tower vacuum outlet b is connected with a plate condenser vapor phase inlet d through a pipeline, a plate condenser working solution outlet f is connected with a working solution separator working solution inlet h through a pipeline, a working solution separator working solution outlet j is connected with the top of a working solution tank 5 through a pipeline, a working solution separator vacuum outlet pipe i is sequentially connected with a water ring vacuum pump 8 and a working solution receiving tank inlet pipe Z2 through pipelines, a working solution receiving tank outlet pipe Z4 is connected with a No. 1 working solution pump 6 through a pipeline and then connected back to the top of the working solution tank 5, a circulating pipeline is arranged between the water ring vacuum pump 8 and a working solution receiving tank 7, and a working solution circulating pipe receiving tank Z3 is connected with a water ring vacuum pump 8; the bottom outlet of the working liquid tank 5 is connected with a working liquid pump 9 No. 2 and then connected with one side of the top of the distillation kettle 10, the middle pipeline of the top of the distillation kettle 10 is connected with a methanol gas inlet pipe x1 of the distillation tower, the methanol gas outlet pipe x2 of the distillation tower is connected with a methanol gas inlet p of the methanol condenser, one pipeline of a methanol outlet s of the methanol condenser is connected with a methanol recovery tank 16, and the other pipeline of the methanol outlet s of the methanol condenser is connected with a valve and then is connected with a methanol reflux inlet pipe y1 of the distillation tower; a methanol gas outlet r of the methanol condenser is connected with a methanol gas inlet t of the tail gas condenser; a reflux outlet pipe y2 of the distillation tower is connected with the other side of the top of the distillation kettle 10; the discharging port pipe n1 of the distillation kettle is connected with a No. 3 working solution pump 18 and a waste water tank 19 in sequence.

The specific operation flow during production is as follows: crude biodiesel enters from a crude methyl ester feed inlet a of the flash tower, is heated to a certain temperature by a heat conducting oil heater on the upper part of the flash tower 1, and enters a high vacuum distillation tower from a crude methyl ester outlet c of the flash tower under low vacuum to produce a product. Wherein most of low-boiling-point substances such as methanol, water and the like are removed in a flash tower. The low vacuum tail gas enters the plate condenser 2 from a flash tower vacuum outlet b, the vacuum tail gas is condensed into working solution through the plate condenser 2, the working solution automatically flows to the working liquid separator 4 from a working solution outlet f of the plate condenser, the working solution automatically flows to the working liquid tank 5 from a working solution outlet j of the working liquid separator, part of uncondensed vacuum tail gas flows out from a vacuum outlet pipe i of the working liquid separator after the working liquid separator 4 separates the liquid, the vacuum tail gas enters the water ring vacuum pump 8, part of the vacuum tail gas is further condensed in the working solution receiving tank 7, the working solution is pumped to the working liquid tank 5 by the working liquid pump No. 1, the uncondensed vacuum tail gas flows out from a vacuum tail gas outlet pipe Z1 of the working solution receiving tank, and the tail gas enters the vacuum tail gas treatment system for treatment. When the working solution of the working solution tank 5 reaches a certain amount, starting a No. 2 working solution pump 9 to pump the working solution into a distillation kettle 10 from a working solution inlet k of the distillation kettle, setting the tower top temperature of a distillation tower 11 to 64 ℃ to start distilling the working solution, starting a temperature and pressure automatic control system 17, automatically adjusting a steam valve, enabling methanol vapor in the working solution in the distillation kettle 10 to rise from a methanol gas outlet l of the distillation kettle to enter a methanol gas inlet pipe x1 of the distillation tower, starting distilling the methanol by the distillation tower 11, enabling the methanol vapor to flow out from a methanol gas outlet pipe x2 of the distillation tower to pass through a methanol condenser 13, manually adjusting methanol reflux, and enabling qualified recovered methanol to automatically flow to a recovered methanol tank 16; noncondensable tail gas gets into tail gas processing system from tail gas condenser noncondensable gas export u, stops steam after the methyl alcohol recovery in the working solution is accomplished, and waste water is followed distillation still discharge gate pipe n1 mouth and is gone out, is taken out waste water tank 19 by No. 3 working solution pump 6 and is handled. When the pressure of cooling water is insufficient in the process of distilling the working solution, the automatic temperature and pressure control system 17 can automatically close the steam valve of the distillation kettle 11, so that the safe production is ensured.

Claims (1)

1. The utility model provides a biodiesel flash distillation dealcoholize working solution distillation automatic control device which characterized by: the device comprises a flash tower (1), a plate condenser (2), a working liquid separator intermediate partition plate (3), a working liquid separator (4), a working liquid tank (5), a No. 1 working liquid pump (6), a working liquid receiving tank (7), a water ring vacuum pump (8), a No. 2 working liquid pump (9), a distillation kettle (10), a distillation tower (11), a digital display thermometer (12), a methanol condenser (13), a tail gas condenser (14), a digital display pressure transmitter (15), a recovered methanol tank (16), a temperature and pressure automatic control system (17), a No. 3 working liquid pump (18), a waste water tank (19), a connecting pipeline and a valve; the temperature and pressure automatic control system (17) comprises a temperature and pressure regulating valve TpV, a digital display thermometer (12) with a temperature sensor, a digital display pressure transmitter (15) with a pressure sensor, a program control system PLC, a computer and an electric control cabinet, wherein the temperature and pressure automatic control system (17) is connected with the digital display thermometer (12) and the digital display pressure transmitter (15) through signal lines, and the PLC is connected with the temperature and pressure regulating valve TPV, the digital display thermometer (12), the digital display pressure transmitter (15) and the computer through signal lines; the upper part of the left side of the plate condenser (2) is provided with a plate condenser cooling water outlet (e), the lower part of the left side is provided with a plate condenser cooling water inlet (g), the upper part is provided with a plate condenser vapor phase inlet (d), and the lower part is provided with a plate condenser working solution outlet (f); a middle partition plate with the height of 1.5 meters is arranged at the middle upper part in the working liquid separator (4), a working liquid separator vacuum outlet pipe (i) is arranged at the position, 0.35 meter away from the middle partition plate, of the right side of the top, a working liquid inlet (h) of the working liquid separator is arranged at the position, 0.35 meter away from the middle partition plate, of the left side of the top, a working liquid outlet (j) of the working liquid separator is arranged at the lower part, and a sight glass is arranged at the working liquid outlet (j) of the working liquid separator, so that the separation effect can be observed conveniently; the right side of the top of the working liquid receiving tank (7) is provided with a working liquid receiving tank vacuum tail gas outlet pipe (Z1), the left side of the top is provided with a working liquid receiving tank inlet pipe (Z2), the left side of the lower part is provided with a working liquid receiving tank outlet pipe (Z4), and the right side of the lower part is provided with a working liquid receiving tank circulating pipe (Z3); a working solution inlet (k) of the distillation kettle is arranged at the top of the distillation kettle (10) close to the edge, a methanol gas outlet (l) of the distillation kettle is arranged at the center of the top, a distillation kettle return pipe (m) is also arranged at the top of the distillation kettle (10) close to the edge, a distillation kettle discharge port pipe (n1) is arranged at the center of the bottom, a steam heating coil is arranged in the distillation kettle (10), a steam inlet pipe (n2) is arranged at the top of the distillation kettle (10) close to the edge, a steam outlet pipe (n3) is arranged at the bottom of the distillation kettle (10) close to the other side of the edge, a steam inlet pipe (n2) is connected with a temperature and pressure regulating valve TPV pipeline, and a manual valve is additionally arranged as a bypass; a distillation tower methanol gas outlet pipe (x2) is arranged at the center of the top of the distillation tower (11), and a digital display thermometer (12) with a temperature sensor is arranged behind the distillation tower methanol gas outlet pipe; a distillation tower methanol reflux inlet pipe (y1) is arranged on the side surface of the upper part of the distillation tower (11), a distillation tower reflux outlet pipe (y2) is arranged at the center of the bottom of the distillation tower (11), and a distillation tower methanol gas inlet pipe (x1) is arranged on the side surface of the bottom; a methanol condenser cooling water outlet (q) is formed in the left side of the top of the methanol condenser (13), and a methanol condenser cooling water inlet (o) is formed in the lower portion of the right side of the top of the methanol condenser; a pressure transmitter (15) with a digital display is arranged on a header pipe in front of the pressure transmitter, a methanol condenser methanol gas outlet (r) is arranged on the right side of the top of the methanol condenser, a methanol condenser methanol gas inlet (p) is arranged on the upper part of the left side, and a methanol condenser methanol outlet(s) is arranged in the center of the bottom of the methanol condenser; a tail gas condenser cooling water outlet (v2) is formed in the left side of the top of the tail gas condenser (14), a tail gas condenser cooling water inlet (v1) is formed in the lower portion of the right side of the tail gas condenser, a tail gas condenser noncondensable gas outlet (u) is formed in the right side of the top of the tail gas condenser, a tail gas condenser methanol gas inlet (t) is formed in the upper portion of the left side of the tail gas condenser, and a tail gas condenser methanol outlet (w) is formed in the center of the bottom of the tail gas condenser; a flash tower vacuum outlet (b) is connected with a plate condenser vapor phase inlet (d) through a pipeline, a plate condenser working solution outlet (f) is connected with a working solution separator working solution inlet (h) through a pipeline, a working solution separator working solution outlet (j) is connected with the top of a working solution tank (5) through a pipeline, a working solution separator vacuum outlet pipe (i) is sequentially connected with a water ring vacuum pump (8) and a working solution receiving tank inlet pipe (Z2) through pipelines, a working solution receiving tank outlet pipe (Z4) is connected with a No. 1 working solution pump (6) through a pipeline and then connected to the top of the working solution tank (5), a circulating pipeline is arranged between the water ring vacuum pump (8) and a working solution receiving tank (7), and a working solution receiving tank circulating pipeline (Z3) is connected to the water ring vacuum pump (8); an outlet at the bottom of the working liquid tank (5) is connected with one side of the top of the distillation kettle (10) after being connected with the working liquid pump (2) (9), a pipeline at the middle part of the top of the distillation kettle (10) is connected with a methanol gas inlet pipe (x1) of the distillation tower, a pipeline of a methanol gas outlet pipe (x2) of the distillation tower is connected with a methanol gas inlet (p) of a methanol condenser, one pipeline of a methanol outlet(s) of the methanol condenser is connected with a methanol recovery tank (16), and the other pipeline is connected with a valve and then is connected back to a methanol reflux inlet pipe (y1) of the distillation tower; a methanol gas outlet (r) of the methanol condenser is connected with a methanol gas inlet (t) of the tail gas condenser; a reflux outlet pipe (y2) of the distillation tower is connected with the other side of the top of the distillation kettle (10); the distillation kettle discharge port pipe (n1) is connected with a No. 3 working solution pump (18) and a waste water tank (19) in sequence.

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