A tail gas safety and environmental protection system and method for sodium ethoxide production device

Abstract

The invention discloses a tail gas safety and environmental protection system and method for a sodium ethoxide production device, including a sulfuric acid metering tank, a circulation pump, a spray tower, an induced draft fan and a flame arrester, wherein the upper end of the spray tower is provided with a primary spray head and a secondary spray head distributed in parallel, a sulfuric acid metering tank is provided on one side of the spray tower, a circulation pump is connected on one side of the sulfuric acid metering tank, a flame arrester is provided on the top of the spray tower, the circulation pump is connected with a circulation pipe, and the circulation pipe is respectively connected to the primary spray head and the secondary spray head, the induced draft fan is connected with two activated carbon boxes, the activated carbon boxes are respectively connected with an intermediate tank, a reactor and vacuum tail gas, a flame detector is provided inside the upper end of the flame arrester, and the circulation pump and the induced draft fan are both connected with a control station. The present invention adjusts the pH of the accumulated liquid in the spray tower by arranging a sulfuric acid metering tank, and the control station automatically controls the addition of tail gas, the supplement of sulfuric acid and the discharge of sewage, thereby reducing the allocation of personnel and reducing the pollution discharged.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas environmental protection treatment, and in particular to a tail gas safety and environmental protection system and method for a sodium ethoxide production device. Background Art

[0002] Sodium ethoxide is an organic substance, mainly used in the pharmaceutical and pesticide industries. It can also be used as a strong alkaline catalyst, ethoxylating agent, and as a coagulant and reducing agent in organic synthesis. Pharmaceutical products using sodium ethoxide include phenytoin, phenylbutazone, primidone, methyldopa, tetracaine hydrochloride, ercosamine, aminopterin, pyrimethamine, and pyrimethamine. In addition, it is also used in pesticides and as an analytical reagent. It is mainly used in the pharmaceutical and pesticide industries. It is used as a strong alkaline catalyst, ethoxylating agent, and as a reducing agent in organic synthesis, pharmaceutical synthesis, etc.

[0003] During the production process of sodium ethoxide, a large amount of exhaust gas will be generated. As people's awareness of environmental protection gradually increases, certain measures have been taken to treat the exhaust gas, thereby minimizing the pollution caused by flue gas emissions.

[0004] After massive search, the prior art was found, the publication number is CN111659204A, which discloses a factory tail gas safety and environmental protection treatment device, belonging to the field of air pollution control, including a primary treatment box and a fine treatment box, the primary treatment box is connected with the air inlet pipe, the outlet end of the air inlet pipe is provided with a spray row, the primary treatment box is provided with a reagent addition pipe, the primary treatment box is provided with a filter plate, the top of the primary treatment box is connected with the fine treatment box through a ventilation pipe, the fine treatment box is provided with a partition, the inner wall of the ventilation channel is evenly provided with brushes, the inner wall of the fine treatment box is installed with an ultraviolet light lamp, the outer wall of the fine treatment box is provided with a lime water tank, the lime water tank is provided with a water pipe, the outlet end of the water pipe is provided with a spray plate, the top of the fine treatment box and the drying box, the drying box is provided with a water absorption partition, and the outlet end of the drying box is connected with the electrostatic dust removal box. The present invention improves the effect and efficiency of water filtration, better intercepts particles in the tail gas, facilitates the removal of sulfides in the factory tail gas, ensures the cleanliness, hygiene and environmental protection of the exhaust gas, ensures safety, reduces the use cost, and is conducive to the use of small and medium-sized enterprises.

[0005] In summary, when the existing tail gas treatment equipment treats the tail gas generated in the production process of sodium ethoxide, a large amount of hydrogen, ethanol and sodium ethoxide dust particles are generated during the reaction process, so the alkaline substances need to be neutralized during the treatment process, and the existing treatment method has a harsh working environment, and the control and treatment process requires a large number of human resources to be stationed, the required personnel configuration is large, and the treatment volume is low. Summary of the invention

[0006] The object of the present invention is to provide a sodium ethoxide production device tail gas safety and environmental protection system and method to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a tail gas safety and environmental protection system and method for a sodium ethoxide production device, comprising a sulfuric acid metering tank, a circulation pump, a spray tower, an induced draft fan and a flame arrester, wherein the upper end of the spray tower is provided with a primary spray head and a secondary spray head distributed in parallel, a sulfuric acid metering tank is provided on one side of the spray tower, a circulation pump is connected to one side of the sulfuric acid metering tank, the circulation pump is connected to the spray tower, the induced draft fan is located on the other side of the spray tower, and the induced draft fan is connected to the spray tower, a flame arrester is provided on the top of the spray tower, the circulation pump is connected to a circulation pipe, the circulation pipe is respectively connected to the primary spray head and the secondary spray head, and the sulfuric acid metering tank is connected to the circulation pump through a sulfuric acid pipe;

[0008] The induced draft fan is connected to two activated carbon boxes, which are respectively connected to an intermediate tank, a reactor and vacuum tail gas. A flame detector is arranged inside the upper end of the flame arrester, a perforated 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 induced draft fan are both connected to a control station.

[0009] Preferably, the circulation pipe is connected to a sewage pipe and a water inlet pipe respectively, one side of the water inlet pipe is connected to a sulfuric acid metering tank, and the outer wall of the sulfuric acid metering tank and one side of the spray tower are both provided with a magnetic flap level gauge;

[0010] 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.

[0011] Preferably, a sieve plate is provided below the primary spray head and the secondary spray head, and fillers are laid on the upper surfaces of the sieve plates. The pore size of the sieve plate is 8-12 mm, and the diameter of the primary spray head and the secondary spray head is 3-4 mm.

[0012] Preferably, both activated carbon boxes are filled with activated carbon, the vacuum exhaust gas discharged from the intermediate tank and the reactor is injected into the activated carbon box, the upper end of the activated carbon box is connected with the dryer exhaust gas, and the vacuum exhaust gas discharged from the activated carbon box and the dryer exhaust gas are injected into the induced draft fan.

[0013] Preferably, a pressure transmitter is provided at the lower end of the flame arrester, and the steam pipe connection is located between the flame detector and the orifice filter.

[0014] Preferably, a pH meter and an ethanol concentration meter are respectively provided on both sides of the lower end of the spray tower.

[0015] Preferably, the method for using the tail gas safety and environmental protection system of the sodium ethoxide production device is as follows:

[0016] S1: The magnetic flap level gauge on one side of the sulfuric acid metering tank detects the sulfuric acid level in the sulfuric acid metering tank. When the level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station. The control station feeds back a signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank. The automatic valve opens to add water to the sulfuric acid metering tank. At the same time, the automatic valve on the sulfuric acid input pipe opens to add sulfuric acid to the sulfuric acid metering tank. After adding to the specified amount, the automatic valve closes to stop adding water and sulfuric acid to the sulfuric acid metering tank.

[0017] The temperature transmitter can detect the temperature in the sulfuric acid metering tank and feed back the temperature signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank to control the rate of adding water.

[0018] S2: The vacuum tail gas discharged from the intermediate tank and the reactor passes through two activated carbon boxes, which are used alternately. After the vacuum tail gas intersects with the dryer tail gas, it is transmitted to the spray tower through the induced draft fan;

[0019] The vacuum exhaust gas and the dryer exhaust gas enter the spray tower through the air inlet pipe. The air inlet pipe and the spray tower are connected by a hose, and the inclination angle between the air inlet pipe and the horizontal plane is 3-5°;

[0020] S3: The magnetic flap level gauge on one side of the spray tower can detect the liquid level inside the spray tower. When the liquid level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station, and the control station feeds back a signal to the automatic valve at the upper end of the sulfuric acid pipe. The automatic valve opens, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower.

[0021] The circulation pump extracts the accumulated liquid at the bottom of the spray tower, mixes the accumulated liquid with the water transmitted by the water inlet pipe through the circulation pipe, and transmits it to the primary spray head and the secondary spray head. The primary spray head and the secondary spray head spray water to remove dust and neutralize the vacuum exhaust gas in the spray tower;

[0022] The water mist is deposited at the bottom of the spray tower, and the pH meter detects the pH value of the effluent. When the pH value is lower than the lower limit, the automatic valve at the upper end of the sulfuric acid pipe opens, and sulfuric acid is injected into the spray tower. The concentration of sulfuric acid is 3-5%, and the pH value of the effluent is adjusted to be controlled between 8-12.

[0023] The ethanol concentration meter detects the ethanol concentration in the effluent. If the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, and the control station feeds back a signal to the automatic valve of the sewage pipe. The automatic valve opens and discharges the sewage in the spray tower through the sewage pipe.

[0024] S4: When the primary and secondary spray heads in the spray tower spray water mist, the treated exhaust gas rises in the spray tower. The orifice filter can prevent large particles of water droplets from being discharged and prevent large particles of water droplets from carrying dry dust and causing flame arrester blockage;

[0025] The flame detector can detect in the exhaust pipe. If a 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 a signal to the automatic valve on the steam pipe. The automatic valve opens and transmits steam to the exhaust pipe to extinguish the fire.

[0026] The pressure transmitter can detect the pressure in the exhaust pipe. When the detected pressure is 20-50kpa, the signal is transmitted to the control station, and the control station feeds back the signal to the warning light for alarm.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention automatically controls sulfuric acid consumption, water intake, tail gas intake, flame control and sewage discharge through a control station, effectively reducing the human resource investment in the treatment process, and the treatment process has a high degree of automation, and can effectively treat hydrogen, ethanol and sodium ethanolate dust particles. At the same time, the automated treatment changes the working environment of the staff, reduces occupational hazards, and realizes unattended and automated operation during the control process, which can greatly reduce the allocation of personnel, and the smoke required to be discharged contains fewer pollutants and the treatment rate is also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1 , the present invention provides seven embodiments: Embodiment 1:

[0033] A tail gas safety and environmental protection system for a sodium ethoxide production device comprises a sulfuric acid metering tank, a circulation pump, a spray tower, an induced draft fan and a flame arrester. The upper end of the spray tower is provided with a primary spray head and a secondary spray head which are distributed in parallel. A sulfuric acid metering tank is provided on one side of the spray tower. A circulation pump is connected to one side of the sulfuric acid metering tank. The circulation pump is connected to the spray tower. The induced draft fan is located on the other side of the spray tower. A flame arrester is provided on the top of the spray tower. The circulation pump is connected to a circulation pipe, which is respectively connected to the primary spray head and the secondary spray head. The sulfuric acid metering tank is connected to the circulation pump through the sulfuric acid pipe. A magnetic flap level gauge on 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 the lower limit, the magnetic flap level gauge 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 opens to add water to the sulfuric acid metering tank. At the same time, the automatic valve on the sulfuric acid input pipe opens to add sulfuric acid to the sulfuric acid metering tank. After adding to a specified amount, the automatic valve closes to stop adding water and sulfuric acid to the sulfuric acid metering tank.

[0034] 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. The temperature transmitter can detect the temperature in the sulfuric acid metering tank, and feed back the temperature signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank to control the rate of adding water. The temperature transmitter can detect the temperature in the sulfuric acid metering tank, and feed back the temperature signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank to control the rate of adding water. Embodiment 2:

[0035] The induced draft fan is connected to two activated carbon boxes, which are respectively connected to the intermediate tank, reactor and vacuum exhaust gas. A flame detector is arranged inside the upper end of the flame arrester, a perforated 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 induced draft fan are both connected to the control station. The two activated carbon boxes are filled with activated carbon, and the vacuum exhaust gas discharged from the intermediate tank and the reactor is injected into the activated carbon box. The upper end of the activated carbon box is connected to the exhaust gas of the dryer, and the vacuum exhaust gas and the exhaust gas of the dryer are both injected into the induced draft fan.

[0036] The vacuum exhaust gas discharged from the intermediate tank and the reactor passes through two activated carbon boxes, which are used alternately. After the vacuum exhaust gas meets the dryer exhaust gas, it is transmitted to the spray tower through the induced draft fan. The vacuum exhaust gas and the dryer exhaust gas enter the spray tower through the air inlet pipe. The air inlet pipe and the spray tower are connected at a hose, and the inclination angle between the air inlet pipe and the horizontal plane is 3-5°. Embodiment three:

[0037] The circulation pipe is connected to the sewage pipe and the water inlet pipe respectively. One side of the water inlet pipe is connected to the sulfuric acid metering tank. The sulfuric acid metering tank and the outer wall of one side of the spray tower are both provided with magnetic flap level gauges.

[0038] The magnetic flap level gauge on one side of the spray tower can detect the liquid level inside the spray tower. When the liquid level is lower than the lower limit, the magnetic flap level gauge transmits the signal to the control station, and the control station feeds back the signal to the automatic valve at the upper end of the sulfuric acid pipe. The automatic valve opens, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower. Embodiment 4:

[0039] A sieve plate is provided under the primary spray head and the secondary spray head. The upper surface of the sieve plate is paved with fillers. The aperture of the sieve plate is 8-12mm. The diameter of the primary spray head and the secondary spray head is 3-4mm. The circulating pump extracts the accumulated liquid at the bottom of the spray tower, and mixes the accumulated liquid with the water transmitted by the water inlet pipe through the circulating pipe, and transmits it to the primary spray head and the secondary spray head. The primary spray head and the secondary spray head spray water to remove dust and neutralize the vacuum tail gas in the spray tower.

[0040] The primary spray head and the secondary spray head spray water mist, which can absorb the sodium ethoxide dust in the exhaust gas and effectively treat the sodium ethoxide dust. Embodiment five:

[0041] A pressure transmitter is provided at the lower end of the flame arrester. The steam pipe connection is located between the flame detector and the orifice filter. When the primary and secondary spray heads in the spray tower spray water mist, the treated exhaust gas rises in the spray tower. The orifice filter can prevent large particles of water droplets from being discharged and prevent large particles of water droplets from carrying dry dust and causing clogging of the flame arrester.

[0042] The flame detector can detect in the exhaust pipe. If a 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 a signal to the automatic valve on the steam pipe. The automatic valve opens and transmits steam to the exhaust pipe to extinguish the fire.

[0043] The pressure transmitter can detect the pressure in the exhaust pipe. When the detected pressure is 20-50kpa, the signal is transmitted to the control station, and the control station feeds back the signal to the warning light for alarm. Embodiment six:

[0044] A pH meter and an ethanol concentration meter are respectively provided on both sides of the lower end of the spray tower. Water mist is deposited at the bottom of the spray tower. The pH meter detects the pH value of the effluent. When the pH value is lower than the lower limit, the automatic valve at the upper end of the sulfuric acid pipe opens and sulfuric acid is injected into the spray tower. The concentration of sulfuric acid is 3-5%. The pH value of the effluent is adjusted to control the pH value between 8-12.

[0045] 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, and the control station feeds back a signal to the automatic valve of the sewage pipe. The automatic valve opens to discharge the sewage in the spray tower through the sewage pipe. Embodiment seven:

[0046] The method of using the tail gas safety and environmental protection system of the sodium ethoxide production unit is as follows:

[0047] S1: The magnetic flap level gauge on one side of the sulfuric acid metering tank detects the sulfuric acid level in the sulfuric acid metering tank. When the level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station. The control station feeds back a signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank. The automatic valve opens to add water to the sulfuric acid metering tank. At the same time, the automatic valve on the sulfuric acid input pipe opens to add sulfuric acid to the sulfuric acid metering tank. After adding to the specified amount, the automatic valve closes to stop adding water and sulfuric acid to the sulfuric acid metering tank.

[0048] The temperature transmitter can detect the temperature in the sulfuric acid metering tank and feed back the temperature signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank to control the rate of adding water.

[0049] S2: The vacuum tail gas discharged from the intermediate tank and the reactor passes through two activated carbon boxes, which are used alternately. After the vacuum tail gas intersects with the dryer tail gas, it is transmitted to the spray tower through the induced draft fan;

[0050] The vacuum exhaust gas and the dryer exhaust gas enter the spray tower through the air inlet pipe. The air inlet pipe and the spray tower are connected by a hose, and the inclination angle between the air inlet pipe and the horizontal plane is 3-5°;

[0051] S3: The magnetic flap level gauge on one side of the spray tower can detect the liquid level inside the spray tower. When the liquid level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station, and the control station feeds back a signal to the automatic valve at the upper end of the sulfuric acid pipe. The automatic valve opens, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower.

[0052] The circulation pump extracts the accumulated liquid at the bottom of the spray tower, mixes the accumulated liquid with the water transmitted by the water inlet pipe through the circulation pipe, and transmits it to the primary spray head and the secondary spray head. The primary spray head and the secondary spray head spray water to remove dust and neutralize the vacuum exhaust gas in the spray tower;

[0053] The water mist is deposited at the bottom of the spray tower, and the pH meter detects the pH value of the effluent. When the pH value is lower than the lower limit, the automatic valve at the upper end of the sulfuric acid pipe opens, and sulfuric acid is injected into the spray tower. The concentration of sulfuric acid is 3-5%, and the pH value of the effluent is adjusted to be controlled between 8-12.

[0054] The ethanol concentration meter detects the ethanol concentration in the effluent. If the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, and the control station feeds back a signal to the automatic valve of the sewage pipe. The automatic valve opens and discharges the sewage in the spray tower through the sewage pipe.

[0055] S4: When the primary and secondary spray heads in the spray tower spray water mist, the treated exhaust gas rises in the spray tower. The orifice filter can prevent large particles of water droplets from being discharged and prevent large particles of water droplets from carrying dry dust and causing flame arrester blockage;

[0056] The flame detector can detect in the exhaust pipe. If a 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 a signal to the automatic valve on the steam pipe. The automatic valve opens and transmits steam to the exhaust pipe to extinguish the fire.

[0057] The pressure transmitter can detect the pressure in the exhaust pipe. When the detected pressure is 20-50kpa, the signal is transmitted to the control station, and the control station feeds back the signal to the warning light for alarm.

[0058] Working principle: The magnetic flap level gauge on one side of the sulfuric acid metering tank detects the sulfuric acid level in the sulfuric acid metering tank. When the liquid level is lower than the lower limit, the magnetic flap level gauge transmits the signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank. The automatic valve opens to add water to the sulfuric acid metering tank. At the same time, the automatic valve on the sulfuric acid input pipe opens to add sulfuric acid to the sulfuric acid metering tank. After adding to the specified amount, the automatic valve closes to stop adding water and sulfuric acid to the sulfuric acid metering tank. The temperature transmitter can detect the temperature in the sulfuric acid metering tank and feed back the temperature signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank to control the rate of adding water.

[0059] The vacuum exhaust gas and dryer exhaust gas enter the spray tower through the air inlet pipe. The air inlet pipe and the spray tower are connected by a hose, and the inclination angle between the air inlet pipe and the horizontal plane is 3-5°. The vacuum exhaust gas discharged from the intermediate tank and the reactor passes through the activated carbon box and is transmitted to the spray tower by the induced draft fan.

[0060] The magnetic flap level gauge on one side of the spray tower can detect the liquid level inside the spray tower. When the liquid level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station, and the control station feeds back a signal to the automatic valve at the upper end of the sulfuric acid pipe. The automatic valve opens, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower. The circulating pump extracts the accumulated liquid at the bottom of the spray tower, mixes the accumulated liquid with the water transmitted by the water inlet pipe through the circulating pipe, and transmits it to the primary spray head and the secondary spray head. The primary spray head and the secondary spray head spray water to remove dust and neutralize the vacuum tail gas in the spray tower.

[0061] The water mist is deposited at the bottom of the spray tower, and the pH meter detects the pH value of the effluent. When the pH value is lower than the lower limit, the automatic valve at the upper end of the sulfuric acid pipe opens, and sulfuric acid is injected into the spray tower. The concentration of sulfuric acid is 3-5%, and the pH value of the effluent is adjusted to be controlled between 8-12.

[0062] 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, and the control station feeds back a signal to the automatic valve of the sewage pipe. The automatic valve opens to discharge the sewage in the spray tower through the sewage pipe.

[0063] During the process of the primary and secondary spray heads in the spray tower spraying water mist, the treated exhaust gas rises in the spray tower. The orifice filter can prevent the discharge of large particles of water droplets and prevent large particles of water droplets from carrying dry dust to cause clogging of the flame arrester. The flame detector can detect the exhaust pipe. If a 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. The automatic valve opens and transmits steam to the exhaust pipe to extinguish the fire. The pressure transmitter can detect the pressure in the exhaust pipe. When the detected pressure is 20-50kpa, the signal is transmitted to the control station, and the control station feeds back the signal to the warning light for alarm.

[0064] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A tail gas safety and environmental protection system for a sodium ethoxide production device, comprising a sulfuric acid metering tank, a circulation pump, a spray tower, an induced draft fan and a flame arrester, characterized in that: The upper end of the spray tower is provided with a primary spray head and a secondary spray head distributed in parallel, a sulfuric acid metering tank is provided on one side of the spray tower, a circulation pump is connected to one side of the sulfuric acid metering tank, the circulation pump is connected to the spray tower, the induced draft fan is located on the other side of the spray tower, and the induced draft fan is connected to the spray tower, a flame arrester is provided on the top of the spray tower, the circulation pump is connected to a circulation pipe, the circulation pipe is respectively connected to the primary spray head and the secondary spray head, and the sulfuric acid metering tank is connected to the circulation pump through a sulfuric acid pipe; The induced draft fan is connected to two activated carbon boxes, which are respectively connected to an intermediate tank, a reactor and vacuum tail gas. A flame detector is arranged inside the upper end of the flame arrester, a perforated 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 induced draft fan are both connected to a control station.

2. A sodium ethoxide production device tail gas safety and environmental protection system according to claim 1, characterized in that: The circulation pipe is connected to a sewage pipe and a water inlet pipe respectively, one side of the water inlet pipe is connected to a sulfuric acid metering tank, and the outer wall of the sulfuric acid metering tank and one side of the spray tower are both provided with a magnetic flap level gauge; 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. A sodium ethoxide production device tail gas safety and environmental protection system according to claim 2, characterized in that: A sieve plate is arranged below the primary spray head and the secondary spray head, and fillers are laid on the upper surface of the sieve plate. The aperture of the sieve plate is 8-12 mm, and the diameter of the primary spray head and the secondary spray head is 3-4 mm.

4. A sodium ethoxide production device tail gas safety and environmental protection system according to claim 3, characterized in that: The two activated carbon boxes are filled with activated carbon, and the vacuum exhaust gas discharged from the intermediate tank and the reactor is injected into the activated carbon box. The upper end of the activated carbon box is connected with the dryer exhaust gas, and the vacuum exhaust gas discharged from the activated carbon box and the dryer exhaust gas are injected into the induced draft fan.

5. A sodium ethoxide production device tail gas safety and environmental protection system according to claim 4, characterized in that: A pressure transmitter is arranged at the lower end of the flame arrester, and the steam pipe connection is located between the flame detector and the orifice filter.

6. A sodium ethoxide production device tail gas safety and environmental protection system according to claim 5, characterized in that: A pH meter and an ethanol concentration meter are respectively arranged on both sides of the lower end of the spray tower.

7. A method for using a tail gas safety and environmental protection system for a sodium ethoxide production device according to claim 6, characterized in that: The method for using the tail gas safety and environmental protection system of the sodium ethoxide production device is as follows: S1: The magnetic flap level gauge on one side of the sulfuric acid metering tank detects the sulfuric acid level in the sulfuric acid metering tank. When the level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station. The control station feeds back a signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank. The automatic valve opens to add water to the sulfuric acid metering tank. At the same time, the automatic valve on the sulfuric acid input pipe opens to add sulfuric acid to the sulfuric acid metering tank. After adding to the specified amount, the automatic valve closes to stop adding water and sulfuric acid to the sulfuric acid metering tank. The temperature transmitter can detect the temperature in the sulfuric acid metering tank and feed back the temperature signal to the control station. The control station feeds back the signal to the automatic valve of the connecting pipe between the water inlet pipe and the sulfuric acid metering tank to control the rate of adding water. S2: The vacuum tail gas discharged from the intermediate tank and the reactor passes through the activated carbon box. There are two activated carbon boxes, which are used alternately. The vacuum tail gas from the activated carbon box intersects with the dryer tail gas and is then transmitted to the spray tower through the induced draft fan. The vacuum exhaust gas and the dryer exhaust gas enter the spray tower through the air inlet pipe. The air inlet pipe and the spray tower connection are connected by a hose, and the inclination angle between the air inlet pipe and the horizontal plane is 3-5°; S3: The magnetic flap level gauge on one side of the spray tower can detect the liquid level inside the spray tower. When the liquid level is lower than the lower limit, the magnetic flap level gauge transmits a signal to the control station, and the control station feeds back a signal to the automatic valve at the upper end of the sulfuric acid pipe. The automatic valve opens, and the sulfuric acid pipe transmits the sulfuric acid in the sulfuric acid metering tank to the spray tower. The circulation pump extracts the accumulated liquid at the bottom of the spray tower, mixes the accumulated liquid with the water transmitted by the water inlet pipe through the circulation pipe, and transmits it to the primary spray head and the secondary spray head. The primary spray head and the secondary spray head spray water to remove dust and neutralize the vacuum exhaust gas in the spray tower; The water mist is deposited at the bottom of the spray tower, and the pH meter detects the pH value of the effluent. When the pH value is lower than the lower limit, the automatic valve at the upper end of the sulfuric acid pipe opens, and sulfuric acid is injected into the spray tower. The concentration of sulfuric acid is 3-5%, and the pH value of the effluent is adjusted to be controlled between 8-12. The ethanol concentration meter detects the ethanol concentration in the effluent. If the ethanol concentration reaches 2%, the ethanol concentration meter transmits a signal to the control station, and the control station feeds back a signal to the automatic valve of the sewage pipe. The automatic valve opens and discharges the sewage in the spray tower through the sewage pipe. S4: When the primary and secondary spray heads in the spray tower spray water mist, the treated exhaust gas rises in the spray tower. The orifice filter can prevent large particles of water droplets from being discharged and prevent large particles of water droplets from carrying dry dust and causing flame arrester blockage; The flame detector can detect in the exhaust pipe. If a 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 a signal to the automatic valve on the steam pipe. The automatic valve opens and transmits steam to the exhaust pipe to extinguish the fire. The pressure transmitter can detect the pressure in the exhaust pipe. When the detected pressure is 20-50kpa, the signal is transmitted to the control station, and the control station feeds back the signal to the warning light for alarm.

Images