Cleaning system after shutdown of maleic anhydride preparation system

Abstract

The invention discloses a cleaning system after a maleic anhydride preparation system is shut down, comprising an inlet pipe connected to a feed pipe of the preparation system and an outlet pipe connected to a discharge pipe of the preparation system, the inlet pipe is connected to a ball bucket, the ball bucket is provided with a cleaning ball for cleaning; a positioning part is provided above the preparation system, a short-wave detection sensor is provided in the positioning part, a light-emitting part is provided at the bottom of the positioning part, the light-emitting part is provided with a plurality of independently working light-emitting heads; the body of the cleaning ball is a hard sphere, a hemispherical protrusion is provided on the outer spherical surface of the cleaning ball; a battery and a short-wave transmitter are provided inside the cleaning ball, the short-wave transmitter works in conjunction with the short-wave detection sensor; the outlet pipe is connected to a feed pipe of a separation part, a stirring motor is provided at the top of the separation part, the stirring motor is provided with a stirring rod inserted into a cleaning cavity, and the stirring rod is provided with a stirring blade spirally downward.

Description

Technical Field

[0001] The invention relates to a cleaning system after a maleic anhydride preparation system is shut down. Background Art

[0002] Maleic anhydride, also known as maleic anhydride, maleic anhydride, 2,5-furandione, etc. Orthorhombic crystals are colorless needle-shaped or flaky crystals. It has a strong pungent odor, is soluble in ethanol, ether and acetone, and is difficult to dissolve in petroleum ether and carbon tetrachloride. It reacts with hot water to form maleic acid. It is mainly used as a raw material for the production of unsaturated polyester resins, alkyd resins, pesticide malathion, high-efficiency and low-toxic pesticide 4049, and long-acting iodine amine. It is also a comonomer of coatings, maleic rosin, polymaleic anhydride, maleic anhydride-styrene copolymers, and is also an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran, etc.

[0003] The main preparation methods of maleic anhydride are catalytic oxidation of benzene or oxidation of butene or butane with air. Among them, most companies use the benzene oxidation method and butane oxidation method.

[0004] Benzene oxidation method: Using vanadium molybdenum oxide as a catalyst, air and benzene vapor are mixed to undergo an oxidation reaction to produce maleic anhydride. A tube-in-tube reactor is used to remove the reaction heat with molten salt and produce steam as a by-product, which is then cooled to obtain the product.

[0005] Butane oxidation method: It can be divided into two methods: fixed bed and fluidized bed. The catalyst is vanadium phosphorus oxide, vanadium molybdenum oxide, molybdenum phosphorus oxide and other systems.

[0006] Maleic anhydride is mainly used as raw material for the production of unsaturated polyester resin, alkyd resin, pesticide malathion, high-efficiency and low-toxic pesticide 4049, and long-acting iodine amine. It is also a comonomer of coatings, maleic rosin, polymaleic anhydride, maleic anhydride-styrene copolymer, and an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran, etc.

[0007] When the maleic anhydride preparation system is running, if there are foreign impurities in the reactor, it will cause irreparable damage to the entire production system. Therefore, it is necessary to detect the preparation system before it is put into operation. Once the equipment is running, it will be extremely difficult to detect impurities in the system. Therefore, before starting the operation, the preparation system needs to be detected for foreign matter and then cleaned to ensure that there are no impurities in the internal pipelines, thereby ensuring the safety of processing. Summary of the invention

[0008] In view of the deficiencies in the prior art, the present invention provides a cleaning system for a maleic anhydride preparation system after shutdown. The system has a simple structure and low cost, is easy to manufacture and can be promoted on a large scale. Before the preparation system is operated, foreign matter detection is performed and then cleaning is performed to ensure that there are no impurities in the internal pipelines, thereby ensuring the safety of processing and avoiding accidents.

[0009] In order to solve the above technical problems, the present invention is solved by the following technical solutions: a cleaning system after the maleic anhydride preparation system is shut down, comprising an inlet pipe connected to the feed pipe of the preparation system and an outlet pipe connected to the discharge pipe of the preparation system, the inlet pipe is connected to a ball bucket, the inlet pipe is connected to a water pump, the water pump provides water for detection into the inlet pipe, and the ball bucket is provided with a cleaning ball for cleaning; a positioning part is provided above the preparation system, a short-wave detection sensor is provided in the positioning part, a light-emitting part is provided at the bottom of the positioning part, and a plurality of independently working light-emitting heads are provided in the light-emitting part; the body of the cleaning ball is a hard sphere, the spherical surface of the cleaning ball is provided with a pit, the pit is filled with fluorescent material, a transparent baffle is provided on the top of the pit to prevent leakage of the fluorescent material, and a plurality of irregularly arranged hemispherical protrusions are provided on the outer spherical surface of the cleaning ball, the protrusions are made of elastic material and have a sticky surface; a battery and a short-wave transmitter are provided inside the cleaning ball, The shortwave transmitter cooperates with the shortwave detection sensor to work; the outlet pipe is connected to the feed pipe of the separation part, and an inclined partition is arranged in the separation part, and the partition divides the internal cavity of the separation part into a cleaning cavity and a water filtering cavity. A stirring motor is arranged at the top of the separation part, and the stirring motor is provided with a stirring rod inserted into the cleaning cavity, and the stirring rod is provided with a stirring blade spirally downward, and the feed pipe is inserted into the cleaning cavity from the side top of the separation part, and a plurality of water spray parts are arranged at the top of the cleaning cavity, and the water spray part is provided with a plurality of water spray holes, and the water spray part is connected with a water supply pipe, and the water supply pipe is connected with an external water purification part; the partition is provided with a plurality of sieve holes, and the size of the sieve holes is smaller than the size of the cleaning ball, and a ball outlet is arranged on the side wall of the separation part connected to the lowest end of the partition, and the outer cover of the ball outlet is provided with a material blocking plate; an arc-shaped bottom plate is arranged at the bottom of the water filtering cavity, and a water outlet pipe is connected at the lowest point of the bottom plate, and a connecting flange is arranged on the water outlet pipe, and a sealing plate is installed on the connecting flange through bolt connection.

[0010] In the above technical solution, preferably, the stirring blade is arranged obliquely and the end away from the stirring rod is higher than the end close to the stirring rod.

[0011] In the above technical solution, preferably, a support foot is provided at the bottom of the separation portion.

[0012] The present invention provides a cleaning system after the shutdown of a maleic anhydride preparation system, which has a simple structure and low cost, is easy to manufacture and can be easily promoted on a large scale. Before the preparation system is operated, foreign matter detection is performed and then cleaning is performed to ensure that there are no impurities in the internal pipelines, thereby ensuring the safety of processing and avoiding accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 It is a schematic diagram of the cleaning ball structure of the present invention.

[0015] Figure 3 It is a schematic diagram of the separation unit structure of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 3 As shown, the cleaning system after the shutdown of the maleic anhydride preparation system comprises an inlet pipe 11 connected to the feed pipe of the preparation system and an outlet pipe 12 connected to the discharge pipe of the preparation system, the inlet pipe 11 is connected to a ball bucket 113, the inlet pipe 11 is connected to a water pump, the water pump provides water for detection into the inlet pipe 11, the ball bucket 113 is provided with a cleaning ball 3 for cleaning; a positioning part 2 is provided above the preparation system, a short-wave detection sensor is provided in the positioning part 2, and a light-emitting part 21 is provided at the bottom of the positioning part 2, the light-emitting part 21 The light part 21 is provided with a plurality of independently working light-emitting heads; the body of the cleaning ball 3 is a hard sphere, the spherical surface of the cleaning ball 3 is provided with a pit, the pit is filled with fluorescent material, the top of the pit is provided with a transparent baffle to prevent leakage of the fluorescent material, and the outer spherical surface of the cleaning ball 3 is provided with a plurality of irregularly arranged hemispherical protrusions 31, the protrusions 31 are made of elastic material and have a sticky surface; a battery and a short-wave transmitter are provided inside the cleaning ball 3, and the short-wave transmitter cooperates with the short-wave detection sensor to work; the outlet pipe 1 2 is connected to a feed pipe 40 of a separation part 4, wherein an inclined partition 41 is provided in the separation part 4, wherein the partition 41 divides the internal cavity of the separation part 4 into a cleaning cavity and a water filtering cavity, wherein a stirring motor 5 is provided at the top of the separation part 4, wherein the stirring motor 5 is provided with a stirring rod 51 inserted into the cleaning cavity, wherein the stirring rod 51 is provided with a stirring blade 52 spirally downward, wherein the feed pipe 40 is inserted into the cleaning cavity from the side top of the separation part 4, wherein a plurality of water spraying parts 61 are provided at the top of the cleaning cavity, wherein the water spraying parts 61 are provided with a plurality of water spraying holes, wherein the ... The water part 61 is connected to a water supply pipe 6, and the water supply pipe 6 is connected to an external water purification part; the partition 41 is provided with a plurality of sieve holes, and the size of the sieve holes is smaller than the size of the cleaning ball 3; a ball outlet 45 is provided on the side wall of the separation part 4 connected to the lowest end of the partition 41, and the outer cover of the ball outlet 45 is provided with a baffle plate 451; an arc-shaped bottom plate 43 is provided at the bottom of the water filter chamber, and a water outlet pipe 44 is connected to the lowest point of the bottom plate 43, and the water outlet pipe 44 is provided with a connecting flange 441, and a sealing plate 442 is installed on the connecting flange 441 through bolt connection.

[0017] The stirring blade 52 is arranged obliquely, and the end away from the stirring rod 51 is higher than the end close to the stirring rod 51 .

[0018] A support leg 42 is disposed at the bottom of the separation portion 4 .

[0019] When the device is working, a water pump is used to supply water, and then the cleaning ball 3 is first mixed with water through the inlet pipe 11 and enters the maleic anhydride preparation system through the ball bucket 113, and the path inside the maleic anhydride preparation system is walked from beginning to end. Because the outer spherical surface of the cleaning ball 3 is provided with a plurality of irregularly arranged hemispherical protrusions 31, the protrusions 31 are made of elastic material and have a sticky surface. Therefore, if there are foreign objects in the maleic anhydride preparation system, a small part of these foreign objects will be stuck by the sticky protrusions 31. Therefore, the cleaning work is completed.

[0020] In addition, if there are many foreign objects inside, the cleaning ball 3 may be stuck. At this time, the cleaning ball 3 needs to be positioned.

[0021] A short-wave transmitter is provided in the cleaning ball 3, so the short-wave detection sensor provided in the positioning part 2 can detect the position of the cleaning ball 3. Then the positioning part 2 drives the light-emitting part 21 to work, and the light-emitting head corresponding to the position of the cleaning ball 3 on the light-emitting part 21 emits bright light, which can determine the specific position of the cleaning ball 3. Therefore, as long as the parts at the corresponding position are removed, the cleaning ball 3 can be taken out, and the parts at that position can also be cleaned to remove foreign matter.

[0022] If there are many foreign matters attached, the entire preparation system needs to be cleaned. If there are few foreign matters attached, cleaning the entire preparation system will cause significant waste and affect efficiency.

[0023] The cleaning ball 3 that has participated in the cleaning work will adhere to more foreign matter. Therefore, before participating in the cleaning work again, the cleaning ball 3 needs to be cleaned.

[0024] Therefore, the device is provided with a separation unit for separating the cleaning ball 3 from sewage and foreign matter.

[0025] After the cleaning work, the cleaning ball 3 enters the cleaning chamber from the feed pipe 40. At the same time, the stirring motor is driven to work, so that the stirring rod drives the stirring blade to work. The cleaning ball 3 falls on the stirring blade, and then driven by the rotation of the stirring rod, the cleaning balls rub against each other, so that foreign matter is separated. At the same time, the water spray part 61 sprays clean water onto the cleaning ball 3, so as to wash away the foreign matter.

[0026] Then, the cleaning balls will slowly move downward under the action of the stirring rod. The numerous cleaning balls 3 squeeze and rub against each other, and then slowly move downward due to the stirring action of the stirring rod and the guidance of the stirring blade 52. Finally, they will break away from the stirring blade and fall onto the partition 41. The partition 41 is provided with sieve holes, so that water and foreign matter can leave through the sieve holes, while the cleaning balls 3 remain on the partition 41.

[0027] Next, under the guidance of the partition plate 41 , the cleaning ball 3 moves toward the ball outlet 45 .

[0028] During operation, the baffle plate 451 is removed, and then a conveyor belt is placed here, and then a hopper is placed on the conveyor belt to recover the cleaning balls 3 after cleaning.

[0029] The sewage and foreign matter passing through the partition 41 are collected by the arc-shaped bottom plate 43 and finally enter the outlet pipe 44 .

[0030] When the device is working, the sealing plate 442 will be removed, and then the sewage pipe and the water outlet pipe 44 will be connected to discharge the sewage.

[0031] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

[0032] The present invention provides a cleaning system after the shutdown of a maleic anhydride preparation system, which has a simple structure and low cost, is easy to manufacture and can be easily promoted on a large scale. Before the preparation system is operated, foreign matter detection is performed and then cleaning is performed to ensure that there are no impurities in the internal pipelines, thereby ensuring the safety of processing and avoiding accidents.

Claims

1. A cleaning system after the shutdown of the maleic anhydride preparation system, characterized by: The invention comprises an inlet pipe (11) connected to a feed pipe of a preparation system and an outlet pipe (12) connected to an outlet pipe of the preparation system, the inlet pipe (11) being connected to a ball bucket (113), the inlet pipe (11) being connected to a water pump, the water pump providing water for detection to enter the inlet pipe (11), the ball bucket (113) being provided with a cleaning ball (3) for cleaning; a positioning part (2) being provided above the preparation system, a short-wave detection sensor being provided in the positioning part (2), a light-emitting part (21) being provided at the bottom of the positioning part (2), the light-emitting part (21) being provided with a plurality of independently working light-emitting heads; the body of the cleaning ball (3) The cleaning ball (3) is a hard sphere, the spherical surface of the cleaning ball (3) is provided with a pit, the pit is filled with fluorescent material, the top of the pit is provided with a transparent baffle to prevent leakage of the fluorescent material, and the outer spherical surface of the cleaning ball (3) is provided with a plurality of irregularly arranged hemispherical protrusions (31), the protrusions (31) are made of elastic material and have a sticky surface; a battery and a short-wave transmitter are provided inside the cleaning ball (3), and the short-wave transmitter cooperates with the short-wave detection sensor to work; the outlet pipe (12) is connected to the feed pipe (40) of the separation part (4), and the separation part (4) is provided with an inclined partition (41), and the partition (41) separates the separation part (4). The internal cavity of the separation part (4) is divided into a cleaning cavity and a water filtering cavity. A stirring motor (5) is arranged at the top of the separation part (4). The stirring motor (5) is provided with a stirring rod (51) inserted into the cleaning cavity. The stirring rod (51) is provided with a stirring blade (52) spirally downward. The feed pipe (40) is inserted into the cleaning cavity from the side top of the separation part (4). A plurality of water spraying parts (61) are arranged at the top of the cleaning cavity. The water spraying parts (61) are provided with a plurality of water spraying holes. The water spraying parts (61) are connected to a water supply pipe (6). The water supply pipe (6) is connected to an external water purification part. The partition plate (41) is provided with a plurality of sieve holes. The size of the sieve holes is smaller than that of the The cleaning ball (3) has a size of 100 mm / s; a ball outlet (45) is arranged on the side wall of the separation part (4) connected to the lowest end of the partition (41); the outer cover of the ball outlet (45) is provided with a material blocking plate (451); an arc-shaped bottom plate (43) is arranged at the bottom of the water filter chamber; a water outlet pipe (44) is connected to the lowest point of the bottom plate (43); the water outlet pipe (44) is provided with a connecting flange (441); a sealing plate (442) is installed on the connecting flange (441) through bolt connection; the stirring blade (52) is arranged obliquely and the end away from the stirring rod (51) is higher than the end close to the stirring rod (51); and a support foot (42) is arranged at the bottom of the separation part (4).

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