CN113244736A - Safe and environment-friendly system and method for tail gas of sodium ethoxide production device - Google Patents

Abstract

The invention discloses a safe and environment-friendly system and method for tail gas of a sodium ethoxide production device, which comprises a sulfuric acid metering tank, a circulating pump, a spray tower, an induced draft fan and a flame arrester, wherein a primary spray header and a secondary spray header which are distributed in parallel are arranged at the upper end of the spray tower, the sulfuric acid metering tank is arranged on one side of the spray tower, the circulating pump is connected to one side of the sulfuric acid metering tank, the flame arrester is arranged at the top end of the spray tower, the circulating pump is connected with a circulating pipe, the circulating pipe is respectively connected with the primary spray header and the secondary spray header, the induced draft fan is connected with two activated carbon boxes, the activated carbon boxes are respectively connected with a middle tank, a reaction kettle and vacuum tail gas, a flame detector is arranged inside the upper end of the flame arrester, and the circulating pump and the induced draft fan are both connected with a control station. According to the invention, the sulfuric acid metering tank is arranged to regulate the pH of the accumulated liquid in the spray tower, and the control station automatically controls tail gas addition, sulfuric acid supplement and pollution discharge, so that personnel allocation can be reduced, and pollution discharge can be reduced.

Description

Safe and environment-friendly system and method for tail gas of sodium ethoxide production device

Technical Field

The invention relates to the technical field of tail gas environment-friendly treatment, in particular to a system and a method for safely and environmentally protecting tail gas of a sodium ethoxide production device.

Background

Sodium ethoxide is an organic substance, is mainly applied to the pharmaceutical and pesticide industries, and can also be used as a strong basic catalyst, an ethoxylation agent and a coagulant and a reducing agent for organic synthesis. The medicinal products using sodium ethoxide include phenobarbital, phenylbutazone, epileptone, methyldopa, tetracaine hydrochloride, cough-suppressing agent, aminopterin, pyrimethamine, cefuroxime, etc. In addition, it is also used as pesticide and analytical reagent. Is mainly used in the pharmaceutical and pesticide industries. Used as strong base catalyst, ethoxylation agent and reducing agent for organic synthesis, medicine synthesis, etc.

In the production process of sodium ethoxide, a large amount of tail gas can be generated, and certain measures are also taken for treating the tail gas along with the gradual enhancement of environmental awareness of people, so that the pollution generated by smoke emission is reduced to the lowest.

Through magnanimity retrieval, discover prior art, the publication number is CN111659204A, disclose a mill's tail gas safety ring protects processing apparatus, belong to atmosphere pollution control field, including preliminary treatment case and fine processing case, preliminary treatment case and intake pipe intercommunication, the intake pipe exit end is equipped with the spray row, be equipped with the medicament on the preliminary treatment case and add the pipe, be equipped with the filter in the preliminary treatment case, the preliminary treatment top of the case end is through breather pipe and fine processing case intercommunication, fine processing incasement portion is equipped with the baffle, the passageway inner wall of ventilating evenly is equipped with the brush, fine processing incasement wall installation ultraviolet lamp, fine processing case outer wall is equipped with the lime water pitcher, be equipped with the water service pipe on the lime water pitcher, the water service pipe exit end is equipped with the spray tray, fine processing top of the case end and drying cabinet, the inside baffle that absorbs water that is equipped with of drying cabinet, drying cabinet exit end and electrostatic precipitator case intercommunication. The invention improves the water filtering effect and efficiency, better blocks particles in the tail gas, is convenient to remove sulfides and the like in the tail gas of a factory, ensures the cleanness, sanitation and environmental protection of the discharged gas, ensures the safety, reduces the use cost and is beneficial to the utilization of small and medium-sized enterprises.

In summary, when the tail gas generated in the sodium ethoxide production process is treated by the conventional tail gas treatment equipment, a large amount of hydrogen, ethanol and sodium ethoxide dust particles are generated in the reaction process, so that alkaline substances need to be neutralized in the treatment process, the conventional treatment mode has a severe working environment, a large amount of human resources are needed for the control and treatment processes, more personnel are needed to be allocated, and the treatment capacity is low.

Disclosure of Invention

The invention aims to provide a system and a method for safely and environmentally protecting tail gas of a sodium ethoxide production device, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a tail gas safety and environmental protection system and a tail gas safety and environmental protection method for a sodium ethoxide production device comprise a sulfuric acid metering tank, a circulating pump, a spray tower, a draught fan and a flame arrester, wherein a primary spray header and a secondary spray header which are distributed in parallel are arranged at the upper end inside the spray tower;

the draught fan is connected with two activated carbon boxes, the activated carbon boxes are connected with a tundish, a reaction kettle and vacuum tail gas respectively, a flame detector is arranged inside the upper end of the flame arrester, an orifice plate filter is arranged below the flame detector, a steam pipe is connected to one side of the flame arrester, and the circulating pump and the draught fan are connected with a control station.

Preferably, the circulating pipe is respectively connected with a sewage pipe and a water inlet pipe, one side of the water inlet pipe is communicated with a sulfuric acid metering tank, and the outer walls of the sulfuric acid metering tank and one side of the spray tower are respectively provided with a magnetic turning plate liquid level meter;

a temperature transmitter is arranged on one side of the sulfuric acid metering tank, and a sulfuric acid input pipe is connected to one side of the sulfuric acid metering tank.

Preferably, the sieve plates are arranged below the primary spray header and the secondary spray header, the upper surfaces of the sieve plates are paved with fillers, the aperture of each sieve screen is 8-12mm, and the diameters of the primary spray header and the secondary spray header are 3-4 mm.

Preferably, activated carbon is filled in the two activated carbon boxes, vacuum tail gas discharged by the intermediate tank and the reaction kettle is injected into the activated carbon boxes, the upper end of the activated carbon boxes is communicated with the tail gas phase of the dryer, and the vacuum tail gas and the tail gas of the dryer are injected into the draught fan.

Preferably, a pressure transmitter is arranged at the lower end of the flame arrester, and the joint of the steam pipe is positioned between the flame detector and the orifice plate filter.

Preferably, both sides of the lower end of the spray tower are respectively provided with a PH meter and an ethanol concentration meter.

Preferably, the use method of the tail gas safety and environmental protection system of the sodium ethoxide production device is as follows:

s1: the method comprises the following steps that a magnetic turning plate liquid level meter on one side of a sulfuric acid metering tank detects the sulfuric acid liquid level in the sulfuric acid metering tank, when the liquid level is lower than a lower limit, the magnetic turning plate liquid level meter transmits a signal to a control station, the control station feeds back a signal to an automatic valve of a connecting pipe between a water inlet pipe and the sulfuric acid metering tank, the automatic valve is opened, water is added into the sulfuric acid metering tank, the automatic valve on a sulfuric acid input pipe is opened at the same time, sulfuric acid is added into the sulfuric acid metering tank, after the sulfuric acid is added to a specified amount, the automatic valve is closed, and the addition of water and sulfuric acid into the sulfuric acid metering tank is stopped;

the temperature transmitter can detect the temperature in the sulfuric acid metering tank, feed back a temperature signal to the control station, and feed back a signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank by the control station to control the rate of adding water;

s2: vacuum tail gas discharged by the intermediate tank and the reaction kettle passes through two activated carbon boxes, the two activated carbon boxes are alternately used, and the vacuum tail gas is transmitted into a spray tower through a draught fan after being intersected with tail gas of a dryer;

vacuum tail gas and dryer tail gas enter the spray tower through the gas inlet pipe, the gas inlet pipe is connected with the spray tower through a hose, and the inclination angle between the gas inlet pipe and the horizontal plane is 3-5 degrees;

s3: the magnetic turning plate liquid level meter at one side of the spray tower can detect the liquid level in the spray tower, when the liquid level is lower than the lower limit, the magnetic turning plate liquid level meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve at the upper end of the sulfuric acid pipe, the automatic valve is opened, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower;

the circulating pump pumps out accumulated liquid at the bottom of the spray tower, the accumulated liquid is mixed with water transmitted by the water inlet pipe through the circulating pipe and transmitted to the primary spray header and the secondary spray header, and the primary spray header and the secondary spray header spray out the water to remove dust and neutralize the vacuum position in the spray tower;

depositing water mist at the bottom end of the spray tower, carrying out pH detection on accumulated liquid by a pH meter, opening an automatic valve at the upper end of a sulfuric acid pipe when the pH value is lower than the lower limit, injecting sulfuric acid into the spray tower, wherein the concentration of the sulfuric acid is 3-5%, adjusting the pH value of the accumulated liquid, and controlling the pH value to be 8-12;

the ethanol concentration meter detects the ethanol concentration in the accumulated liquid, if the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve of the sewage pipe, and the automatic valve is opened to discharge the sewage in the spray tower through the sewage pipe;

s4: in the process of spraying water mist by a primary spray header and a secondary spray header in the spray tower, the treated tail gas rises in the spray tower, and the pore plate filter can prevent large-particle water drops from being discharged and prevent the large-particle water drops from carrying dry matter dust to cause blockage of a flame arrester;

the flame detector can detect the flame in the exhaust pipe, if the flame is generated in the spray tower and the exhaust pipe, the flame detector detects the flame and transmits a signal to the control station, the control station feeds back the signal to the automatic valve on the steam pipe, and the automatic valve is opened to transmit the steam to the exhaust pipe so as to realize fire extinguishing;

the pressure transmitter can detect the pressure in the exhaust pipe, when the detected pressure is 20-50kpa, a signal is transmitted to the control station, and the control station feeds back the signal to the warning lamp to give an alarm.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the sulfuric acid, the water inlet amount, the tail gas inlet amount, the flame control and the sewage discharge are automatically controlled by the control station, so that the human resource investment in the treatment process is effectively reduced, the automation degree of the treatment process is high, the hydrogen, the ethanol and the sodium ethoxide dust particles can be effectively treated, meanwhile, the automatic treatment changes the working environment of workers, the occupational hazards are reduced, unattended operation and automatic operation are realized in the control process, the personnel configuration can be greatly reduced, fewer pollutants are contained in the required discharged flue gas, and the treatment rate is greatly improved.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present invention provides seven embodiments:

the first embodiment is as follows:

a tail gas safety environmental protection system of a sodium ethoxide production device comprises a sulfuric acid metering tank, a circulating pump, a spray tower, an induced draft fan and a flame arrester, wherein a primary spray header and a secondary spray header which are distributed in parallel are arranged at the upper end inside the spray tower, the sulfuric acid metering tank is arranged at one side of the spray tower, the circulating pump is connected at one side of the sulfuric acid metering tank and is communicated with the spray tower, the induced draft fan is positioned at the other side of the spray tower, the flame arrester is arranged at the top end of the spray tower and is connected with the circulating pump which is respectively communicated with the primary spray header and the secondary spray header, the sulfuric acid metering tank is communicated with the circulating pump through a sulfuric acid pipe, a magnetic turning plate liquid level meter at one side of the sulfuric acid metering tank detects the sulfuric acid liquid level in the sulfuric acid metering tank, when the liquid level is lower than a lower limit, the magnetic turning plate liquid level meter transmits a signal to a control station, and the control station feeds back the signal to an automatic valve of a connecting pipe between a water inlet pipe and the sulfuric acid metering tank, opening an automatic valve, adding water into a sulfuric acid metering tank, simultaneously opening the automatic valve on a sulfuric acid input pipe, adding sulfuric acid into the sulfuric acid metering tank, closing the automatic valve after adding the sulfuric acid to a specified amount, and stopping adding the water and the sulfuric acid into the sulfuric acid metering tank;

sulphuric acid metering tank one side is provided with temperature transmitter, sulphuric acid metering tank one side is connected with the sulphuric acid input tube, temperature transmitter can detect sulphuric acid metering tank intermediate temperature, feedback temperature signal to control station, control station feedback signal is to the automatic valve of connecting pipe between inlet tube and the sulphuric acid metering tank, the speed of control interpolation, temperature transmitter can detect sulphuric acid metering tank intermediate temperature, feedback temperature signal is to the control station, the automatic valve of connecting pipe between control station feedback signal to inlet tube and the sulphuric acid metering tank, the speed of control interpolation.

Example two:

the draught fan is connected with two activated carbon boxes, the activated carbon box is connected with the pans respectively, reation kettle and vacuum tail gas, the inside flame detector that is provided with in flame arrester upper end, flame detector below is provided with the orifice plate filter, flame arrester one side is connected with the steam pipe, the circulating pump all is connected with the control station with the draught fan, it has the active carbon all to fill in two activated carbon boxes, in the activated carbon box was all poured into to pans and reation kettle exhaust vacuum tail gas, activated carbon box upper end and desiccator tail gas phase intercommunication, vacuum tail gas all pours into inside the draught fan into with desiccator tail gas.

Vacuum tail gas exhausted by the intermediate tank and the reaction kettle passes through the activated carbon boxes, the number of the activated carbon boxes is two, the two activated carbon boxes are alternately used, the vacuum tail gas is transmitted into the spray tower through the draught fan after being intersected with tail gas of the dryer, the vacuum tail gas and the tail gas of the dryer enter the spray tower through the air inlet pipe, the air inlet pipe is connected with the spray tower through a hose, and the inclination angle between the air inlet pipe and the horizontal plane is 3-5 degrees.

Example three:

the circulating pipe is respectively connected with a sewage pipe and a water inlet pipe, one side of the water inlet pipe is communicated with a sulfuric acid metering tank, and the outer walls of the sulfuric acid metering tank and one side of the spray tower are respectively provided with a magnetic turning plate liquid level meter;

the magnetism of spray column one side turns over the board level gauge and can detect the liquid level of spray column inside, and when the liquid level was less than the lower limit, the magnetism turned over the board level gauge with signal transmission to control station, and the automatic valve of control station feedback signal to sulphuric acid pipe upper end, the automatic valve was opened, and sulphuric acid pipe transmits the sulphuric acid in the sulphuric acid metering tank to the spray column in.

Example four:

the sieve plates are arranged below the primary spray header and the secondary spray header, the upper surfaces of the sieve plates are paved with fillers, the aperture of each sieve screen is 8-12mm, the diameters of the primary spray header and the secondary spray header are 3-4mm, the accumulated liquid at the bottom of the spray tower is pumped out by the circulating pump, the accumulated liquid and water transmitted by the water inlet pipe are mixed through the circulating pipe and transmitted to the primary spray header and the secondary spray header, and the primary spray header and the secondary spray header spray out the water to remove dust and neutralize the vacuum position in the spray tower;

the primary spray header and the secondary spray header spray water mist, so that sodium ethoxide dust in tail gas can be adsorbed, and the sodium ethoxide dust is effectively treated.

Example five:

the lower end of the flame arrester is provided with a pressure transmitter, the joint of the steam pipe is positioned between the flame detector and the pore plate filter, and the treated tail gas rises in the spray tower in the process of spraying water mist by the primary spray header and the secondary spray header in the spray tower, so that the pore plate filter can prevent large-particle water drops from being discharged and prevent the flame arrester from being blocked due to the fact that the large-particle water drops carry dry matter dust;

the flame detector can detect the flame in the exhaust pipe, if the flame is generated in the spray tower and the exhaust pipe, the flame detector detects the flame and transmits a signal to the control station, the control station feeds back the signal to the automatic valve on the steam pipe, and the automatic valve is opened to transmit the steam to the exhaust pipe so as to realize fire extinguishing;

the pressure transmitter can detect the pressure in the exhaust pipe, when the detected pressure is 20-50kpa, a signal is transmitted to the control station, and the control station feeds back the signal to the warning lamp to give an alarm.

Example six:

a PH meter and an ethanol concentration meter are respectively arranged on two sides of the lower end of the spray tower, water mist is deposited at the bottom end of the spray tower, the PH meter detects the PH of the accumulated liquid, when the PH value is lower than the lower limit, an automatic valve at the upper end of a sulfuric acid pipe is opened, sulfuric acid is injected into the spray tower, the concentration of the sulfuric acid is 3-5%, the PH value of the accumulated liquid is adjusted, and the PH value is controlled to be between 8-12;

the ethanol concentration meter detects the ethanol concentration in the accumulated liquid, and if the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve of the sewage pipe, and the automatic valve is opened to discharge the sewage in the spray tower through the sewage pipe.

Example seven:

the use method of the tail gas safety and environmental protection system of the sodium ethoxide production device comprises the following steps:

s1: the method comprises the following steps that a magnetic turning plate liquid level meter on one side of a sulfuric acid metering tank detects the sulfuric acid liquid level in the sulfuric acid metering tank, when the liquid level is lower than a lower limit, the magnetic turning plate liquid level meter transmits a signal to a control station, the control station feeds back a signal to an automatic valve of a connecting pipe between a water inlet pipe and the sulfuric acid metering tank, the automatic valve is opened, water is added into the sulfuric acid metering tank, the automatic valve on a sulfuric acid input pipe is opened at the same time, sulfuric acid is added into the sulfuric acid metering tank, after the sulfuric acid is added to a specified amount, the automatic valve is closed, and the addition of water and sulfuric acid into the sulfuric acid metering tank is stopped;

the temperature transmitter can detect the temperature in the sulfuric acid metering tank, feed back a temperature signal to the control station, and feed back a signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank by the control station to control the rate of adding water;

s2: vacuum tail gas discharged by the intermediate tank and the reaction kettle passes through two activated carbon boxes, the two activated carbon boxes are alternately used, and the vacuum tail gas is transmitted into a spray tower through a draught fan after being intersected with tail gas of a dryer;

vacuum tail gas and dryer tail gas enter the spray tower through the gas inlet pipe, the gas inlet pipe is connected with the spray tower through a hose, and the inclination angle between the gas inlet pipe and the horizontal plane is 3-5 degrees;

s3: the magnetic turning plate liquid level meter at one side of the spray tower can detect the liquid level in the spray tower, when the liquid level is lower than the lower limit, the magnetic turning plate liquid level meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve at the upper end of the sulfuric acid pipe, the automatic valve is opened, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower;

the circulating pump pumps out accumulated liquid at the bottom of the spray tower, the accumulated liquid is mixed with water transmitted by the water inlet pipe through the circulating pipe and transmitted to the primary spray header and the secondary spray header, and the primary spray header and the secondary spray header spray out the water to remove dust and neutralize the vacuum position in the spray tower;

depositing water mist at the bottom end of the spray tower, carrying out pH detection on accumulated liquid by a pH meter, opening an automatic valve at the upper end of a sulfuric acid pipe when the pH value is lower than the lower limit, injecting sulfuric acid into the spray tower, wherein the concentration of the sulfuric acid is 3-5%, adjusting the pH value of the accumulated liquid, and controlling the pH value to be 8-12;

the ethanol concentration meter detects the ethanol concentration in the accumulated liquid, if the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve of the sewage pipe, and the automatic valve is opened to discharge the sewage in the spray tower through the sewage pipe;

s4: in the process of spraying water mist by a primary spray header and a secondary spray header in the spray tower, the treated tail gas rises in the spray tower, and the pore plate filter can prevent large-particle water drops from being discharged and prevent the large-particle water drops from carrying dry matter dust to cause blockage of a flame arrester;

the flame detector can detect the flame in the exhaust pipe, if the flame is generated in the spray tower and the exhaust pipe, the flame detector detects the flame and transmits a signal to the control station, the control station feeds back the signal to the automatic valve on the steam pipe, and the automatic valve is opened to transmit the steam to the exhaust pipe so as to realize fire extinguishing;

the pressure transmitter can detect the pressure in the exhaust pipe, when the detected pressure is 20-50kpa, a signal is transmitted to the control station, and the control station feeds back the signal to the warning lamp to give an alarm.

The working principle is as follows: the magnetism of sulphuric acid metering tank one side turns over the board level gauge and detects the sulphuric acid liquid level in the sulphuric acid metering tank, when the liquid level is less than the lower limit, the magnetism turns over the board level gauge with signal transmission to control station, control station feedback signal is to the automatic valve of connecting pipe between inlet tube and the sulphuric acid metering tank, the automatic valve is opened, add water in the sulphuric acid metering tank mutually, the automatic valve on the sulphuric acid input pipe is opened simultaneously, add sulphuric acid in the sulphuric acid metering tank, add to the specified volume after, the automatic valve is closed, stop adding water and sulphuric acid in the sulphuric acid metering tank, temperature transmitter can detect the temperature in the sulphuric acid metering tank, feedback temperature signal is to the control station, control station feedback signal is to the automatic valve of connecting pipe between inlet tube and the sulphuric acid metering tank, the rate of adding water is controlled.

Vacuum tail gas and dryer tail gas enter the spray tower through the air inlet pipe, the air inlet pipe is connected with the spray tower through a hose, the inclination angle between the air inlet pipe and the horizontal plane is 3-5 degrees, and the vacuum tail gas discharged by the intermediate tank and the reaction kettle is transmitted into the spray tower through the activated carbon box and the induced draft fan.

The magnetic turning plate liquid level meter at one side of the spray tower can detect the liquid level in the spray tower, when the liquid level is lower than the lower limit, the magnetic turning plate liquid level meter transmits a signal to a control station, the control station feeds back the signal to an automatic valve at the upper end of a sulfuric acid pipe, the automatic valve is opened, the sulfuric acid pipe transmits sulfuric acid in a sulfuric acid metering tank to the spray tower, a circulating pump extracts accumulated liquid at the bottom of the spray tower, the accumulated liquid is mixed with water transmitted by a water inlet pipe through a circulating pipe and transmitted to a primary spray header and a secondary spray header, the primary spray header and the secondary spray header spray the water, and the vacuum position in the spray tower is subjected to dust removal and neutralization;

depositing water mist at the bottom end of the spray tower, carrying out pH detection on accumulated liquid by a pH meter, opening an automatic valve at the upper end of a sulfuric acid pipe when the pH value is lower than the lower limit, injecting sulfuric acid into the spray tower, wherein the concentration of the sulfuric acid is 3-5%, adjusting the pH value of the accumulated liquid, and controlling the pH value to be 8-12;

the ethanol concentration meter detects the ethanol concentration in the accumulated liquid, and if the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve of the sewage pipe, and the automatic valve is opened to discharge the sewage in the spray tower through the sewage pipe.

In the water mist spraying process of a primary spray header and a secondary spray header in a spray tower, tail gas rises in the spray tower after treatment, a pore plate filter can prevent large-particle water droplets from being discharged, and prevent the large-particle water droplets from carrying dry matter dust to cause blockage of a flame arrester, a flame detector can detect in an exhaust pipe, if flames are generated in the spray tower and the exhaust pipe, the flame detector detects the flames and transmits a signal to a control station, the control station feeds back a signal to an automatic valve on a steam pipe, the automatic valve is opened, the steam is transmitted to the exhaust pipe, fire extinguishment is realized, a pressure transmitter can detect the pressure in the exhaust pipe, when the detection pressure is 20-50kpa, the signal is transmitted to the control station, and the control station feeds back the signal to a warning lamp for warning.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (7)

1. The utility model provides a sodium ethoxide apparatus for producing tail gas safety ring protects system, includes sulphuric acid metering tank, circulating pump, spray column, draught fan and spark arrester, its characterized in that: the spraying tower is characterized in that a primary spraying head and a secondary spraying head which are distributed in parallel are arranged at the upper end in the spraying tower, a sulfuric acid metering tank is arranged on one side of the spraying tower, a circulating pump is connected to one side of the sulfuric acid metering tank and communicated with the spraying tower, the induced draft fan is located on the other side of the spraying tower, a flame arrester is arranged at the top end of the spraying tower, the circulating pump is connected with circulating pipes, the circulating pipes are respectively communicated with the primary spraying head and the secondary spraying head, and the sulfuric acid metering tank is communicated with the circulating pump through a sulfuric acid pipe;

the draught fan is connected with two activated carbon boxes, the activated carbon boxes are connected with a tundish, a reaction kettle and vacuum tail gas respectively, a flame detector is arranged inside the upper end of the flame arrester, an orifice plate filter is arranged below the flame detector, a steam pipe is connected to one side of the flame arrester, and the circulating pump and the draught fan are connected with a control station.

2. The sodium ethoxide production apparatus tail gas safety environmental protection system of claim 1, characterized in that: the circulating pipe is respectively connected with a sewage pipe and a water inlet pipe, one side of the water inlet pipe is communicated with a sulfuric acid metering tank, and the outer walls of the sulfuric acid metering tank and one side of the spray tower are respectively provided with a magnetic turning plate liquid level meter;

a temperature transmitter is arranged on one side of the sulfuric acid metering tank, and a sulfuric acid input pipe is connected to one side of the sulfuric acid metering tank.

3. The sodium ethoxide production apparatus tail gas safety environmental protection system of claim 1, characterized in that: the screen plates are arranged below the primary spray header and the secondary spray header, the upper surfaces of the screen plates are paved with fillers, the aperture of each screen mesh is 8-12mm, and the diameters of the primary spray header and the secondary spray header are 3-4 mm.

4. The sodium ethoxide production apparatus tail gas safety environmental protection system of claim 1, characterized in that: two all pack in the active carbon case has the active carbon, the exhaust vacuum tail gas of pans and reation kettle all pours into the active carbon case into, active carbon case upper end and desiccator tail gaseous phase intercommunication, vacuum tail gas and desiccator tail gas all pour into inside the draught fan.

5. The sodium ethoxide production apparatus tail gas safety environmental protection system of claim 1, characterized in that: the lower end of the flame arrester is provided with a pressure transmitter, and the joint of the steam pipe is positioned between the flame detector and the orifice plate filter.

6. The sodium ethoxide production apparatus tail gas safety environmental protection system of claim 1, characterized in that: and a PH meter and an ethanol concentration meter are respectively arranged on two sides of the lower end of the spray tower.

7. The use method of the tail gas safety and environmental protection system of the sodium ethoxide production device according to the claims 1 to 6, characterized in that: the use method of the safe and environment-friendly system for the tail gas of the sodium ethoxide production device comprises the following steps:

s1: the method comprises the following steps that a magnetic turning plate liquid level meter on one side of a sulfuric acid metering tank detects the sulfuric acid liquid level in the sulfuric acid metering tank, when the liquid level is lower than a lower limit, the magnetic turning plate liquid level meter transmits a signal to a control station, the control station feeds back a signal to an automatic valve of a connecting pipe between a water inlet pipe and the sulfuric acid metering tank, the automatic valve is opened, water is added into the sulfuric acid metering tank, the automatic valve on a sulfuric acid input pipe is opened at the same time, sulfuric acid is added into the sulfuric acid metering tank, after the sulfuric acid is added to a specified amount, the automatic valve is closed, and the addition of water and sulfuric acid into the sulfuric acid metering tank is stopped;

the temperature transmitter can detect the temperature in the sulfuric acid metering tank, feed back a temperature signal to the control station, and feed back a signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank by the control station to control the rate of adding water;

s2: vacuum tail gas discharged by the intermediate tank and the reaction kettle passes through two activated carbon boxes, the two activated carbon boxes are alternately used, and the vacuum tail gas is transmitted into a spray tower through a draught fan after being intersected with tail gas of a dryer;

vacuum tail gas and dryer tail gas enter the spray tower through the gas inlet pipe, the gas inlet pipe is connected with the spray tower through a hose, and the inclination angle between the gas inlet pipe and the horizontal plane is 3-5 degrees;

s3: the magnetic turning plate liquid level meter at one side of the spray tower can detect the liquid level in the spray tower, when the liquid level is lower than the lower limit, the magnetic turning plate liquid level meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve at the upper end of the sulfuric acid pipe, the automatic valve is opened, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower;

the circulating pump pumps out accumulated liquid at the bottom of the spray tower, the accumulated liquid is mixed with water transmitted by the water inlet pipe through the circulating pipe and transmitted to the primary spray header and the secondary spray header, and the primary spray header and the secondary spray header spray out the water to remove dust and neutralize the vacuum position in the spray tower;

depositing water mist at the bottom end of the spray tower, carrying out pH detection on accumulated liquid by a pH meter, opening an automatic valve at the upper end of a sulfuric acid pipe when the pH value is lower than the lower limit, injecting sulfuric acid into the spray tower, wherein the concentration of the sulfuric acid is 3-5%, adjusting the pH value of the accumulated liquid, and controlling the pH value to be 8-12;

the ethanol concentration meter detects the ethanol concentration in the accumulated liquid, if the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, the control station feeds back the signal to the automatic valve of the sewage pipe, and the automatic valve is opened to discharge the sewage in the spray tower through the sewage pipe;

s4: in the process of spraying water mist by a primary spray header and a secondary spray header in the spray tower, the treated tail gas rises in the spray tower, and the pore plate filter can prevent large-particle water drops from being discharged and prevent the large-particle water drops from carrying dry matter dust to cause blockage of a flame arrester;

the flame detector can detect the flame in the exhaust pipe, if the flame is generated in the spray tower and the exhaust pipe, the flame detector detects the flame and transmits a signal to the control station, the control station feeds back the signal to the automatic valve on the steam pipe, and the automatic valve is opened to transmit the steam to the exhaust pipe so as to realize fire extinguishing;

the pressure transmitter can detect the pressure in the exhaust pipe, when the detected pressure is 20-50kpa, a signal is transmitted to the control station, and the control station feeds back the signal to the warning lamp to give an alarm.

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