Device and method for recovering acetylene in alkynediol synthesis tail gas

Abstract

The invention relates to the technical field of acetylene recovery treatment, in particular to a device and a method for recovering acetylene in acetylene glycol synthesis tail gas, the device comprises three condensation bodies, each condensation body comprises a condensation body, an upper seal head and a lower seal head, the top of each upper seal head is provided with a gas outlet, the bottom end of each lower seal head is provided with a liquid outlet, and the liquid outlet is communicated with the gas outlet. A condensation pipe is arranged in the condensation body; a rotating shaft is arranged in the condensation body in the axis direction, and an opening-closing assembly is installed at the top of the rotating shaft. A turntable is fixedly mounted at the bottom of the rotating shaft, a cofferdam is arranged on the turntable, a plurality of push-bearing plates are uniformly distributed on the inner wall of the cofferdam, and filter holes are formed in the bottom of the turntable; an air inlet pipe is mounted on the condensation body, the air inlet pipe is parallel to the tangent plane of the condensation body, and a pipe opening of the air inlet pipe faces the push bearing plate; according to the device and the method provided by the invention, components in the tail gas are fully separated, impurities are removed, direct use is facilitated, and the cost is saved; other substances contained in the acetylene are reduced, and the recovery purity of the acetylene is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of acetylene recovery and treatment, and in particular to a device and method for recovering acetylene from acetylene glycol synthesis tail gas. Background Art

[0002] In the process of preparing acetylene glycol, recycling the produced tail gas will lead to a decrease in the overall reaction efficiency; if the tail gas is discharged into the atmosphere, the harmful components in the tail gas will pollute the air or soil. Therefore, the acetylene in the tail gas of acetylene glycol synthesis is recovered to save costs and avoid pollution to the environment.

[0003] Chinese patent document (publication number: CN115990436A) discloses a method for hydrogenating and deacetylening acetylene in acetylene tail gas, which relates to the field of acetylene tail gas treatment, and discloses a method for hydrogenating and deacetylening acetylene in acetylene tail gas, wherein the raw gas is deacetylened by using a hydrogenating and deacetylening system, and the hydrogenating and deacetylening system comprises a first hydrogenating and deacetylening reactor and a second hydrogenating and deacetylening reactor, wherein the first hydrogenating and deacetylening reactor and the second hydrogenating and deacetylening reactor are connected in series or in parallel, and the first hydrogenating and deacetylening reactor and the second hydrogenating and deacetylening reactor are filled with the same type of catalyst, and the acetylene content in the treated raw gas is less than 5ppm. In this scheme, after the catalyst activity in the first hydrogenating and deacetylening reactor decreases, the second hydrogenating and deacetylening reactor can be activated in time, without stopping the equipment, to ensure the stable operation of the system; after the second hydrogenating and deacetylening reactor is activated, the first hydrogenating and deacetylening reactor is used as a pre-deacetylening reactor, which can not only exhaust the catalyst in the first hydrogenating and deacetylening reactor, but also extend the service life of the newly replaced hydrogenating and deacetylening catalyst.

[0004] In the prior art, the harmful components in the tail gas are not separated sufficiently, which easily causes environmental pollution and the purity of acetylene recovery is poor; the separated components contain other impurities and are difficult to be used directly. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a device for recovering acetylene in tail gas of acetylene diol synthesis, which fully separates the components in the tail gas and removes impurities to facilitate direct use; reduces the possibility of acetylene containing other substances and enhances the recovery purity of acetylene.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A device for recovering acetylene in tail gas from acetylene glycol synthesis comprises three condensers, each of which comprises a condenser body, an upper end cap and a lower end cap, a gas outlet is arranged at the top of the upper end cap, a liquid outlet is arranged at the bottom end of the lower end cap, and a condenser pipe is arranged in the condenser body; a rotating shaft is arranged inside the condenser along the axial direction, and an opening and closing assembly is installed on the top of the rotating shaft; a turntable is fixedly installed at the bottom of the rotating shaft, a cofferdam is arranged on the turntable, a plurality of thrust plates are evenly distributed on the inner wall of the cofferdam, and filter holes are arranged at the bottom of the turntable; an air inlet pipe is installed on the condenser body, the air inlet pipe is arranged parallel to the tangent plane of the condenser body, and the pipe mouth of the air inlet pipe faces the thrust plate.

[0008] In a preferred solution, the opening and closing assembly includes a plurality of support rods fixed on a rotating shaft, a vane is rotatably mounted on the support rod, a limiting groove is provided on the vane, a protrusion is fixed on the support rod, and the limiting groove is slidably mounted on the outside of the protrusion.

[0009] In a preferred embodiment, the air inlet pipe includes a first air inlet pipe and a second air inlet pipe, wherein the first air inlet pipe and the second air inlet pipe are respectively located on both sides of the condenser body, and the pipe openings of the first air inlet pipe and the second air inlet pipe are oriented in opposite directions. When air is inhaled, the first air inlet pipe and the second air inlet pipe drive the thrust plate and the turntable to rotate together.

[0010] In a preferred solution, differential pressure valves are installed on both the first air intake pipe and the second air intake pipe.

[0011] In a preferred solution, a float valve is installed on the liquid outlet.

[0012] In a preferred embodiment, the bottom of the condenser body is extended and widened toward the periphery, a dripping eave is provided at the connection between the widened portion of the condenser body and the condenser body, and the dripping eave is located inside the cofferdam.

[0013] In a preferred embodiment, the three condensates include a first condensate, a second condensate and a third condensate; the air outlet of the first condensate is connected to the air inlet pipe of the second condensate, and the air outlet of the second condensate is connected to the air inlet pipe of the third condensate.

[0014] In a preferred embodiment, an annular groove is provided inside the widened portion of the condenser body, and a plurality of protrusions are provided on the outer periphery of the cofferdam, and the protrusions slide against the inner wall of the annular groove.

[0015] In a preferred solution, support seats are fixed on the inner walls of the upper head and the lower head respectively, and the rotating shaft is installed on the support seats at both ends through bearings.

[0016] In a preferred embodiment, the blade has an inclination angle of 30-40 degrees to the vertical plane.

[0017] A preferred solution is to recover acetylene according to the device, comprising the following steps:

[0018] S1, heating the tail gas to 265-285 degrees Celsius under normal pressure to obtain a mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone, tetramethyldecynediol and acetylene;

[0019] S2, passing the mixed steam obtained in S1 into the air inlet pipe of the first condenser, the temperature of the condenser pipe inside the first condenser is set to 225-235 degrees Celsius, and liquid tetramethyldecynediol is obtained at the liquid outlet of the first condenser; the mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone and acetylene is collected at the air outlet of the first condenser;

[0020] S3, passing the mixed steam obtained in step S2 into the air inlet pipe of the second condenser, the temperature of the condenser pipe inside the second condenser is set to 114-124 degrees Celsius, and liquid methyl isoamyl ketone is obtained at the liquid outlet of the second condenser; the mixed steam containing methyl tert-butyl ether and acetylene is collected at the air outlet of the second condenser;

[0021] S4. Pass the mixed steam obtained in step S3 into the air inlet pipe of the third condenser, the temperature of the condenser inside the third condenser is set to 30-40 degrees Celsius, liquid methyl tert-butyl ether is obtained at the liquid outlet of the third condenser, and gaseous acetylene is collected at the air outlet of the third condenser.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the tail gas of acetylene glycol synthesis includes methyl tert-butyl ether, methyl isoamyl ketone, tetramethyldecynediol, potassium hydroxide and acetylene; methyl tert-butyl ether can cause cancer in humans and can also penetrate into the soil to cause environmental pollution; methyl isoamyl ketone can cause irritation or poisoning symptoms in the human body; potassium hydroxide can easily destroy the pH value of the soil and cause damage to the environment. According to the characteristics of large differences in the boiling points of the components, distillation is used for separation; first, the tail gas is heated to 265-285 degrees Celsius (under normal pressure), and the potassium hydroxide is separated to obtain a mixed vapor including methyl tert-butyl ether, methyl isoamyl ketone, tetramethyldecynediol and acetylene, and then the mixed vapor is sequentially passed into three series-connected condensers of the device for liquefaction and collection, and finally gaseous acetylene is obtained;

[0024] The device of the present invention prolongs the residence time and contact area of ​​the mixed steam in the condenser, thereby preventing the mixed steam entering the condenser from entering the next process due to insufficient liquefaction. At the same time, the turntable rotates to quickly filter the collected liquid, thereby improving the recovery quality. The mixed steam is impacted on the turntable in a tangential direction, which increases the power of the turntable and is conducive to the mixed steam being dispersed and fully contacting the condenser for liquefaction, thereby preventing the mixed steam in the air inlet pipe from directly contacting the condenser under the condition of a large temperature difference between hot and cold, thereby preventing operation fluctuations caused by the condensed gas entering the condensation space rapidly, and improving the stability of the device during operation. The blades with an inclined angle form a downward rotating airflow during rotation, and the blades push the rotating airflow downward to disperse it, thereby slowing down the rapid outflow of the rising airflow, prolonging the residence time of the mixed steam in the condenser, increasing the contact area between the mixed steam and the condenser, and improving the efficiency and quality of liquefaction.

[0025] 2. In the device of the present invention, the airflow of the air inlet pipe hits the thrust plate, the thrust plate drives the turntable to rotate, the turntable drives the rotating shaft and the support rod to rotate together, and the blades rotate along with it. The blades form a downward rotating airflow during the rotation process, which slows down the rapid upward outflow of the mixed steam and improves the liquefaction efficiency; when the airflow pressure of the air inlet pipe is relatively large, the turntable is driven to rotate rapidly, the turntable drives the rotating shaft and the support rod to rotate rapidly together, the blades tend to a horizontal state during the rapid rotation process, the mixed steam flowing out through the air outlet is less, the pressure inside the condensate increases, and when the pressure difference on both sides of the differential pressure valve is reduced to the set value, the differential pressure valve automatically closes and stops conveying, thereby extending the contact time between the mixed steam inside the condensate and the condensate pipe, and the mixed steam is fully liquefied; when the mixed steam inside the condensate When the pressure is reduced, the internal pressure decreases, and there is no airflow at the inlet pipe outlet to impact the thrust plate, the turntable and the blade stop rotating, and under the action of gravity, the blade naturally rotates and droops, so that the upper channel is reopened, and the mixed steam inside the condenser flows out, and the pressure is reduced; at this time, when the pressure difference on both sides of the differential pressure valve increases to the set value, the differential pressure valve automatically opens, and the airflow enters the condenser through the first inlet pipe and the second inlet pipe to impact the thrust plate, driving the turntable and the blade to rotate together, and when the pressure is high, the blade rotates to a horizontal state again to cooperate with the differential pressure valve to realize automatic circulation operation; the device of the present invention prolongs the residence time of the mixed steam in the condenser, thereby avoiding the mixed steam entering the condenser from being insufficiently liquefied and entering the next process, affecting the quality of recovery.

[0026] 3. In the device of the present invention, a rotating shaft is arranged inside the condenser, a rotating disk is fixedly installed at the bottom of the rotating shaft, a cofferdam is arranged on the rotating disk, and a plurality of thrust plates are evenly distributed on the inner wall of the cofferdam; the airflow of the first air inlet pipe and the second air inlet pipe on the condenser body acts on the thrust plate, and the thrust plate drives the rotating disk to rotate; the first air inlet pipe and the second air inlet pipe enter in parallel with the tangent plane of the condenser body, so that the airflow entering the condenser body forms a swirl and rises, and then approaches the condenser tube, thereby increasing the contact area between the mixed steam and the condenser tube, and accelerating the liquefaction of the mixed steam; when the airflow in the first air inlet pipe and the second air inlet pipe hits the thrust plate, the mixed steam Steam dispersion is conducive to the mixed steam to more fully contact the condenser to form liquefaction, and at the same time avoids the mixed steam in the air inlet pipe from directly contacting the condenser when the temperature difference between hot and cold is large, prevents the condensed gas from suddenly entering the condensation space and causing operation fluctuations, and improves the stability of the device during operation; the bottom of the condenser body is extended and widened toward the periphery to set a drip eaves, and the drip eaves are located inside the cofferdam, and the liquefied liquid is further collected at the bottom of the turntable, and then filtered through the turntable and flows to the lower head, further reducing the mixing of impurities, obtaining purified liquid, and improving the quality of recovery.

[0027] 4. In the device of the present invention, the support rod is fixedly installed on the upper part of the rotating shaft, and the rotating shaft drives the support rod to rotate during the rotation process; the support rod is movably sleeved with a blade, and a protrusion is fixed on the support rod. The limiting groove of the support rod is sleeved on the outside of the protrusion, and the protrusion limits the blade; the inclination angle of the blade to the vertical plane is 30-40 degrees. During the rotation of the support rod, the blade rotates along, and the blade with an inclination angle forms a downward rotating airflow during the rotation process. The blade with an inclination angle pushes and disperses the rotating airflow downward, slows down the rapid outflow of the rising airflow, prolongs the residence time of the mixed steam in the condenser, increases the contact area between the mixed steam and the condenser tube, and improves the efficiency and quality of liquefaction; under normal conditions, the blade has an inclination angle, which is easier to form a horizontal state during the rotation process, can form a certain sealing state in a relatively short time, shortens the time for the mixed steam to lose, and improves the quality and efficiency of recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the device of the present invention;

[0029] Figure 2 It is a three-dimensional schematic diagram of a partial cross-sectional structure of the device of the present invention;

[0030] Figure 3 It is a three-dimensional schematic diagram of the support rod and blade installation structure of the device of the present invention;

[0031] In the figure: condenser body - 10; upper head - 11; lower head - 12; liquid outlet - 13; air outlet - 14; first air inlet pipe - 15; second air inlet pipe - 16; condenser pipe outlet - 17; condenser pipe inlet - 18; condenser pipe - 19; rotating shaft - 20; supporting seat - 21; rotating disk - 22; cofferdam - 23; thrust plate - 24; filter hole - 25; support rod - 26; blade - 27; protrusion - 28; limiting groove - 29. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0033] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] like Figure 1-Figure 3 As shown in the figure, a device for recovering acetylene in acetylene glycol synthesis tail gas includes three condensers, each condenser includes a condenser body 10, an upper head 11 and a lower head 12, the top of the upper head 11 is provided with an air outlet 14, the bottom end of the lower head 12 is provided with a liquid outlet 13, and a condenser pipe 19 is arranged in the condenser body 10; a rotating shaft 20 is arranged inside the condenser along the axial direction, and an opening and closing assembly is installed on the top of the rotating shaft 20; a turntable 22 is fixedly installed at the bottom of the rotating shaft 20, a cofferdam 23 is arranged on the turntable 22, and several thrust plates 24 are evenly distributed on the inner wall of the cofferdam 23, and a filter hole 25 is arranged at the bottom of the turntable 22; an air inlet pipe is installed on the condenser body 10, and the air inlet pipe is arranged parallel to the tangent plane of the condenser body 10, and the pipe mouth of the air inlet pipe faces the thrust plate 24.

[0035] In the present invention, methyl tert-butyl ether (MTBE), methyl isoamyl ketone (MIBK) and potassium hydroxide are added into a reaction kettle, and then acetylene is introduced for reaction to generate tetramethyldecynediol; in the tail gas of synthesizing acetylene diol, methyl tert-butyl ether, methyl isoamyl ketone, acetylene diol and acetylene exist, which are directly discharged into the atmosphere, causing great pollution to the natural environment and causing waste of energy.

[0036] Among them, methyl tert-butyl ether (MTBE) has certain toxicity. Exposure to high concentrations of methyl tert-butyl ether may cause cancer in humans and affect the upper respiratory tract and eye mucosa of the human body. MTBE is easily miscible with water, can penetrate into the soil, destroy groundwater quality, and cause certain pollution in the natural environment.

[0037] Methyl isoamyl ketone (MIBK) is toxic to a certain extent and can cause central nervous system depression and anesthetic effects, as well as gastrointestinal reactions such as nausea, vomiting, loss of appetite, diarrhea, and respiratory irritation symptoms. When in contact with the skin: methyl isoamyl ketone can irritate or corrode the skin; methyl isoamyl ketone can irritate the eyes when in contact with the eyes, causing eye discomfort or damage; accidental ingestion of methyl isoamyl ketone may cause poisoning symptoms, including nausea, vomiting, abdominal pain, etc.

[0038] Potassium hydroxide (chemical formula: KOH) is a highly alkaline chemical substance that is easily soluble in water and releases a large amount of heat. Its aqueous solution is strongly alkaline. It is highly corrosive and has a burning effect on tissues, especially severely damaging mucous membranes. When potassium hydroxide is dissolved in the soil, it will cause the soil's pH balance to lose balance, affect the growth of plants and animals on the soil, and have a significant negative impact on the environment.

[0039] Acetylene (chemical formula: C 2 H 2 ), a colorless gas at room temperature and pressure. Industrial products sometimes have an unpleasant garlic smell due to impurities. Acetylene itself has an anesthetic effect and is somewhat toxic. Its anesthetic effect is much stronger than that of monoolefins. After inhaling high concentrations of acetylene, people will feel drunk and excited, and can cause drowsiness, cyanosis, dilated pupils, and irregular pulses. After waking up, people often have symptoms such as loss of memory of the relevant accidents. Acetylene is a highly flammable gas. When mixed with air and exposed to fire, it can cause an explosion.

[0040] Acetylene is an important reaction component in industrial production and has high economic value. Recycling the mixture containing acetylene in the tail gas can reflect certain value. However, the tail gas recycling in the present invention will reduce the overall reaction efficiency. Therefore, the acetylene in the tail gas of acetylene diol synthesis is recovered to save costs and avoid pollution to the environment.

[0041] In the present invention, according to the different boiling points of the components in the tail gas mixture, the tail gas mixture is heated and gasified, and then liquefied through condensers at different temperatures to separate the different components.

[0042] At normal temperature and pressure, methyl tert-butyl ether is a liquid with a boiling point of 55 degrees Celsius and a freezing point of -110; acetylene is a gas with a boiling point of -83 degrees Celsius; methyl isoamyl ketone is a liquid with a boiling point of 144 degrees Celsius and a freezing point of -73.9; tetramethyldecynediol is a solid with a boiling point of 255 degrees Celsius and a melting point of 58 degrees Celsius; potassium hydroxide is a solid with a boiling point of 1320 degrees Celsius and a melting point of 380 degrees Celsius.

[0043] In the process of separating the tail gas components, the tail gas is first heated to 285 degrees Celsius to vaporize methyl tert-butyl ether, methyl isoamyl ketone and tetramethyldecynediol, and the solid potassium hydroxide is separated; then the mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone, tetramethyldecynediol and acetylene is passed through three condensers connected in series in sequence, and the acetylene diol, methyl isoamyl ketone and methyl tert-butyl ether are separated in sequence according to their boiling points to obtain acetylene; the first condenser collects the liquefied tetramethyldecynediol, the second condenser collects the liquefied methyl isoamyl ketone, the third condenser collects the liquefied methyl tert-butyl ether, and the acetylene is collected from the gas outlet of the third condenser.

[0044] In the device of the present invention, a rotating shaft 20 is arranged inside the condenser along the axial direction, a rotating disk 22 is fixedly installed at the bottom of the rotating shaft 20, a cofferdam 23 is arranged on the rotating disk 22, and a plurality of thrust plates 24 are evenly distributed on the inner wall of the cofferdam 23; a first air inlet pipe 15 and a second air inlet pipe 16 are arranged on the condenser body 10, and the airflow of the first air inlet pipe 15 and the second air inlet pipe 16 acts on the thrust plate 24, and the thrust plate 24 drives the rotating disk 22 to rotate; the first air inlet pipe 15 and the second air inlet pipe 16 enter the condenser body in parallel with the tangent plane direction, so that the air entering the condenser The airflow inside the body forms a swirl and rises, then approaches the condenser 19, increasing the contact area between the mixed steam and the condenser 19, and accelerating the liquefaction of the mixed steam; when the airflow of the first air inlet pipe 15 and the second air inlet pipe 16 hits the thrust plate 24, the airflow is dispersed, which is conducive to the airflow to more fully contact the condenser 19 to form liquefaction, and at the same time avoids the airflow of the air inlet pipe from directly contacting the condenser 19 when the temperature difference between hot and cold is large, preventing the condensed gas from suddenly entering the condensation space and causing operation fluctuations, thereby improving the stability of the device during operation.

[0045] Among them, a filter hole 25 is opened at the bottom of the turntable 22, and the filter hole 25 is conducive to the liquid flowing out to the liquid outlet 13. The turntable 22 receives the liquefied material inside the condenser, and then flows to the liquid outlet 13 through the filter hole 25. The turntable 22 filters the liquefied material, reduces impurities in the liquefied material at the liquid outlet 13, improves the quality of the liquid, and saves additional equipment and operating steps.

[0046] Furthermore, the opening and closing assembly includes a plurality of struts 26 fixed on the rotating shaft 20 , a vane 27 is rotatably mounted on the strut 26 , a limiting groove 29 is provided on the vane 27 , a protrusion 28 is fixed on the strut 26 , and the limiting groove 29 is slidably mounted on the outside of the protrusion 28 .

[0047] Figure 2 , Figure 3 As shown in , six support rods 26 are fixedly installed on the upper part of the rotating shaft 20. When the rotating shaft 20 rotates, it drives the support rods 26 to rotate together; a blade 27 is movably sleeved on the support rod 26, a protrusion 28 is fixed on the support rod 26, and a limiting groove 29 of the support rod 26 is sleeved outside the protrusion 28, wherein the protrusion 28 limits the blade 27;

[0048] In normal state, under the restriction of the protrusion 28, the blade 27 is inclined at an angle of 30-40 degrees with the vertical plane ( Figure 2 ), preferably 35 degrees; during operation, when the air inlet pressure is relatively high, the thrust plate 24 and the turntable 22 are driven to rotate rapidly, driving the support rod 26 and the blade 27 to rotate rapidly, and the blade 27 can be rotated to a horizontal state. When several blades 27 are in a horizontal state at the same time, they play a certain sealing role on the inside of the condensate. During the continuous gas delivery process of the air inlet pipe, the blade 27 remains horizontal, which can increase the pressure inside the condensate.

[0049] In the present invention, when the air intake pipe is continuously delivering gas, the airflow pushes the thrust plate 24 and the turntable 22 to rotate together, and the turntable 22 drives the rotating shaft 20 and the support rod 26 to rotate together. Since the blade 27 is inclined, when the rotating shaft 20 rotates to a certain speed, the airflow pushes the blade 27 to rotate toward a horizontal state, so that the gas flowing out through the air outlet 14 is reduced. At this time, the pressure inside the condensate increases and further pushes the blade 27 to a horizontal state; in this process, the blade 27 slows down the rapid discharge of the airflow through the air outlet 14, delays the residence time of the mixed steam inside the condensate, improves the efficiency of converting the mixed steam into a liquid state, and improves the purity of the exhaust gas components collected.

[0050] Furthermore, the air intake pipe includes a first air intake pipe 15 and a second air intake pipe 16, which are respectively located on both sides of the condenser body 10, and the pipe openings of the first air intake pipe 15 and the second air intake pipe 16 are facing opposite directions. When air is taken in, the first air intake pipe 15 and the second air intake pipe 16 drive the thrust plate 24 and the turntable 22 to rotate together.

[0051] Figure 1As shown in the figure, the first air inlet pipe 15 and the second air inlet pipe 16 are respectively located on both sides of the condenser body 10, and the directions of the air inlet pipe openings are opposite, and the air inlet pipe openings on both sides are facing the direction of rotation of the turntable 22; during the rotation of the turntable 22, the pipe openings on both sides simultaneously output airflow to act on the thrust plate 24, thereby improving the stability of the turntable during rotation; converting a single gas input port into two or more is conducive to a more uniform distribution and liquefaction of the airflow. At the same time, the multi-directional airflow impact produces a greater linear velocity on the turntable 22, and the rapidly rotating turntable 22 further promotes the dispersion of the airflow, and can also promote the horizontal distribution of the blades 24.

[0052] Furthermore, differential pressure valves are installed on both the first air intake pipe 15 and the second air intake pipe 16 .

[0053] A differential pressure valve is a regulating valve whose main function is to control the flow of fluid according to the pressure difference between two different positions. The differential pressure valve can be adjusted automatically to ensure that the pressure difference between the two positions remains within a preset range. When the pressure difference on both sides exceeds the set value, the differential pressure valve will respond quickly and release the fluid by adjusting the opening so that the pressure difference on both sides is within the preset pressure difference range. When the pressure difference is adjusted to the set value, the differential pressure valve automatically stops. Differential pressure valves are commercially available and are prior art, so they will not be described in detail here.

[0054] In the present invention, differential pressure valves are installed on the first air inlet pipe 15 and the second air inlet pipe 16; when the blades 24 inside the condenser are in a horizontal state during the rotation process, the air flow through the air outlet 14 is small, the pressure inside the condenser increases, and when the pressure difference on both sides of the differential pressure valve is reduced to a set value, the differential pressure valve is automatically closed and the delivery is stopped; at this time, the contact time between the mixed steam inside the condenser and the condenser pipe 19 is prolonged, the mixed steam is fully liquefied, the mixed steam is reduced, the pressure inside the condenser is reduced, and there is no air flow impacting the thrust plate 24 at the air inlet pipe opening, and the turntable 22, the rotating shaft 20, the support plate 21, the rotating shaft 21, the support plate 22, the rotating shaft 22, the support plate ... The rod 26 and the blade 27 both stop rotating. Under the action of gravity, the blade 27 naturally rotates and droops, so that the upper channel is reopened, the air flow inside the condenser flows out, and the pressure is reduced. At this time, the pressure difference on both sides of the differential pressure valve increases. When the pressure difference reaches the set value, the differential pressure valve automatically opens, and the air flow enters the condenser through the first air inlet pipe 15 and the second air inlet pipe 16 to impact the thrust plate 24, driving the turntable 22 to rotate, realizing automatic circulation operation; extending the residence time of the air flow inside the condenser to avoid insufficient liquefaction of the mixed steam entering the condenser and entering the next process, affecting the process quality.

[0055] The condenser inlet 18 is arranged at an end away from the first air inlet pipe 15 and the second air inlet pipe 16, and the condenser outlet 17 is arranged at an end close to the first air inlet pipe 15 and the second air inlet pipe 16. The temperature of the condenser inlet section will be lower than the temperature of the condenser outlet section. When the gas flowing out of the air inlet pipe orifice contacts the condenser outlet section, the temperature difference is relatively small, thereby reducing the possibility of fluctuations in equipment operation.

[0056] Furthermore, a float valve (not shown) is installed on the liquid outlet 13 .

[0057] The float valve is installed at the liquid outlet. When the liquid level is higher than the set value, the float generates buoyancy to open the float valve and the liquid flows out; when the liquid level is lower than the set value, the float valve closes.

[0058] The float valve is commercially available and is prior art, so it will not be described in detail here.

[0059] In the present invention, a float valve is installed at the liquid outlet 13 (not shown in the figure, in the actual installation process, the position of the support seat 21 is moved up to facilitate the installation of the float valve). When the liquid level at the lower end cap 12 is higher than the set value, the float generates buoyancy to open the float valve, and the liquid flows out. When the liquid level at the lower end cap 12 is lower than the set value, the float valve is closed, and the liquid inside the lower end cap 12 acts as a liquid seal for the liquid outlet 13, preventing the pressure inside the condensate from being lost from the liquid outlet 13, which is conducive to the cooperation between the differential pressure valve and the blade 27 to realize automatic circulation operation under the pressure difference state.

[0060] Furthermore, the bottom of the condenser body 10 is extended and widened toward the periphery, and a dripping eave is provided at the connection between the widened portion of the condenser body 10 and the condenser body 10 , and the dripping eave is located inside the cofferdam 23 .

[0061] Figure 2 As shown in the figure, the bottom of the condensate body 10 is extended and widened toward the periphery to set a dripping eaves, and the dripping eaves are located inside the cofferdam 23, so that the liquefied liquid is further collected at the bottom of the turntable 22, and then flows to the lower head 12 after passing through the filter hole 25, so as to further reduce the mixing of impurities, obtain purified liquid, and improve the quality of recovery.

[0062] A filter screen may also be provided at the bottom of the rotating disk 22 to further purify and remove impurities from the liquefied liquid.

[0063] Furthermore, the three condensates include a first condensate, a second condensate and a third condensate; the air outlet 14 of the first condensate is connected to the first air inlet pipe 15 and the second air inlet pipe 16 of the second condensate; the air outlet 14 of the second condensate is connected to the first air inlet pipe 15 and the second air inlet pipe 16 of the third condensate.

[0064] Among them, the temperature of the condenser tube inside the first condenser is set to 225-235 degrees Celsius for liquefying tetramethyldecynediol; the temperature of the condenser tube inside the second condenser is set to 114-124 degrees Celsius for liquefying methyl isoamyl ketone; the temperature of the condenser tube inside the third condenser is set to 30-40 degrees Celsius for liquefying methyl tert-butyl ether.

[0065] Furthermore, an annular groove (not shown) is arranged inside the widened portion of the condenser body 10, and a plurality of protrusions (not shown) are arranged on the outer periphery of the cofferdam 23, and the protrusions are slidably abutted against the inner wall of the annular groove.

[0066] By arranging the projection to slide against the inner wall of the annular chute, the stability of the rotating disk 22 is enhanced. During installation, the projection can be inserted into the annular chute through the inner wall of the cofferdam 23.

[0067] Furthermore, support seats 21 are fixed on the inner walls of the upper head 11 and the lower head 12 respectively, and the rotating shaft 20 is installed on the support seats 21 at both ends through bearings.

[0068] The support seat 21 supports and fixes the rotating shaft 20 , and bearings are installed inside to reduce resistance and ensure smooth rotation.

[0069] Furthermore, the inclination angle of the blade 27 to the vertical plane is 30-40 degrees, preferably 35 degrees.

[0070] When the turntable 22 rotates, the shaft 20, the support rod 26 and the blade 27 rotate together. During the rotation of the support rod 26, the blade rotates along with it. The blade 27 with an inclined angle forms a downward rotating airflow during the rotation. The blade 27 with an inclined angle pushes the rotating airflow downward, slows down the rapid outflow of the airflow below, increases the contact area between the mixed steam and the condenser, prolongs the residence time of the mixed steam in the condensate, and improves the efficiency and quality of liquefaction. Under normal circumstances, the blade 27 has an inclined angle. During the rotation process, if the rotation speed increases, the blade 27 is more likely to form a horizontal state, and can form a certain sealing state in a shorter time, shorten the time for the mixed steam to lose, and improve the process quality and efficiency.

[0071] The method for recovering acetylene according to the device of the present invention comprises the following steps:

[0072] S1, heating the tail gas to 265-285 degrees Celsius under normal pressure to obtain a mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone, tetramethyldecynediol and acetylene;

[0073] S2, passing the mixed steam obtained in S1 into the first air inlet pipe 15 and the second air inlet pipe 16 of the first condenser, the temperature of the condenser pipe inside the first condenser is set to 225-235 degrees Celsius, and the liquid outlet 13 of the first condenser obtains liquid tetramethyldecynediol; the air outlet 14 of the first condenser collects the mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone and acetylene;

[0074] S3, passing the mixed steam obtained in step S2 into the first air inlet pipe 15 and the second air inlet pipe 16 of the second condensate, the temperature of the condenser pipe inside the second condensate is set to 114-124 degrees Celsius, and the liquid outlet 13 of the second condensate obtains liquid methyl isoamyl ketone; the air outlet 14 of the second condensate collects the mixed steam containing methyl tert-butyl ether and acetylene;

[0075] S4. The mixed steam obtained in step S3 is passed into the first air inlet pipe 15 and the second air inlet pipe 16 of the third condensate. The temperature of the condenser inside the third condensate is set to 30-40 degrees Celsius. The liquid outlet 13 of the third condensate obtains liquid methyl tert-butyl ether, and the gas outlet 14 of the third condensate collects gaseous acetylene.

[0076] The present invention illustrates the technical concept of the present invention through the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that the relevant improvements to the present invention fall within the protection scope and disclosure scope of the present invention.

Claims

1. A device for recovering acetylene from tail gas of acetylene glycol synthesis, comprising three condensers, each condenser comprising a condenser body (10), an upper end cap (11) and a lower end cap (12), characterized in that: An air outlet (14) is provided at the top of the upper end cover (11), a liquid outlet (13) is provided at the bottom end of the lower end cover (12), and a condenser tube (19) is arranged inside the condenser body (10); a rotating shaft (20) is arranged inside the condenser body along the axial direction, and an opening and closing assembly is installed on the top of the rotating shaft (20); a turntable (22) is fixedly installed at the bottom of the rotating shaft (20), a cofferdam (23) is arranged on the turntable (22), a plurality of thrust plates (24) are evenly distributed on the inner wall of the cofferdam (23), and a filter hole (25) is provided at the bottom of the turntable (22); an air inlet pipe is installed on the condenser body (10), the air inlet pipe is arranged parallel to the tangent plane of the condenser body (10), and the pipe mouth of the air inlet pipe faces the thrust plate (24).

2. The device for recovering acetylene in acetylenic diol synthesis tail gas according to claim 1, characterized in that: The opening and closing assembly comprises a plurality of support rods (26) fixedly mounted on a rotating shaft (20); a vane plate (27) is rotatably mounted on the support rod (26); a limiting groove (29) is provided on the vane plate (27); a convex block (28) is fixedly mounted on the support rod (26); and the limiting groove (29) is slidably mounted on the outside of the convex block (28).

3. The device for recovering acetylene in acetylenic diol synthesis tail gas according to claim 1, characterized in that: The air intake pipe comprises a first air intake pipe (15) and a second air intake pipe (16), wherein the first air intake pipe (15) and the second air intake pipe (16) are respectively located on two sides of the condenser body (10), and the pipe openings of the first air intake pipe (15) and the second air intake pipe (16) face opposite directions. When air is taken in, the first air intake pipe (15) and the second air intake pipe (16) drive the thrust plate (24) and the rotating disk (22) to rotate in the same direction.

4. The device for recovering acetylene in acetylenic diol synthesis tail gas according to claim 3, characterized in that: The first air intake pipe (15) and the second air intake pipe (16) are both equipped with differential pressure valves.

5. The device for recovering acetylene in acetylenic diol synthesis tail gas according to claim 1, characterized in that: A float valve is installed on the liquid outlet (13).

6. The device for recovering acetylene from acetylene glycol synthesis tail gas according to claim 1, characterized in that: The bottom of the condenser body (10) is extended and widened toward the periphery, and a dripping eave is arranged at the connection between the widened portion of the condenser body (10) and the condenser body (10), and the dripping eave is located inside the cofferdam (23).

7. The device for recovering acetylene from acetylene glycol synthesis tail gas according to claim 3, characterized in that: The three condensates include a first condensate, a second condensate and a third condensate; the air outlet (14) of the first condensate is connected to the air inlet pipe (15, 16) of the second condensate, and the air outlet (14) of the second condensate is connected to the air inlet pipe (15, 16) of the third condensate.

8. The device for recovering acetylene from acetylene glycol synthesis tail gas according to claim 6, characterized in that: An annular groove is arranged inside the widened portion of the condenser body (10), and a plurality of protrusions are arranged on the outer periphery of the cofferdam (23), and the protrusions are slidably abutted against the inner wall of the annular groove.

9. The device for recovering acetylene in acetylenic diol synthesis tail gas according to claim 2, characterized in that: The blade (27) has an inclination angle of 30-40 degrees with respect to the vertical plane.

10. A method for recovering acetylene according to the device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, heating the tail gas to 265-285 degrees Celsius under normal pressure to obtain a mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone, tetramethyldecynediol and acetylene; S2, passing the mixed steam obtained in S1 into the air inlet pipe (15, 16) of the first condenser, the temperature of the condenser pipe inside the first condenser is set to 225-235 degrees Celsius, and the liquid outlet (13) of the first condenser obtains liquid tetramethyldecynediol; the mixed steam containing methyl tert-butyl ether, methyl isoamyl ketone and acetylene is collected at the air outlet (14) of the first condenser; S3, passing the mixed steam obtained in step S2 into the air inlet pipe (15, 16) of the second condenser, the temperature of the condenser pipe inside the second condenser is set to 114-124 degrees Celsius, and the liquid outlet (13) of the second condenser obtains liquid methyl isoamyl ketone; the air outlet (14) of the second condenser collects the mixed steam containing methyl tert-butyl ether and acetylene; S4. The mixed steam obtained in step S3 is passed into the air inlet pipe (15, 16) of the third condenser. The temperature of the condenser inside the third condenser is set to 30-40 degrees Celsius. The liquid outlet (13) of the third condenser obtains liquid methyl tert-butyl ether, and the air outlet (14) of the third condenser collects gaseous acetylene.

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