Catalyst protection device for upper tube plate area of synthesis tower

Abstract

The utility model discloses a catalyst protection device for an upper tube plate area of a synthetic tower, and relates to the technical field of methanol production. An exhaust hole is formed in the top of the tank body; a gas distributor is mounted on one side of the top of the tank body; an operation opening is formed in one side of the tank body; a ladder is mounted at the bottom of the operation opening in the tank body; and a reaction layer is arranged between the silk screen and the upper tube plate. According to the utility model, a worker enters the tank body through the operation opening and the frame ladder, and conveniently replaces a protective agent stacked above the silk screen by virtue of the operation table, so that the convenience when the protective agent is slippery is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the methanol production technical field, specifically, especially relate to a catalyst protection device for upper tube sheet area of synthetic tower. BACKGROUND

[0002] Methanol production uses methanol synthesis tower, and reaction tubes are uniformly arranged in the middle of the methanol synthesis tower, and upper tube sheets and lower tube sheets are respectively installed at the top end and the bottom end of the reaction tubes, catalysts are filled in the reaction tubes at the lower tube sheet, and the catalysts catalyze the synthetic gas injected at the upper tube sheet to prepare methanol, and the synthetic gas needs to pass through upstream low-temperature methanol washing and fresh gas compression units before entering the methanol synthesis tower, since the two devices require carbon steel material for pressure resistance, the low-temperature methanol washing device is corroded by sulfur, ammonia and other substances in the circulating methanol, and carbon monoxide in the fresh gas also causes phase corrosion to the carbon steel pipeline, thus generating volatile hydroxyl iron, and the synthetic gas carries a certain amount of carbonyl iron after entering the methanol synthesis tower, however, the catalysts for preparing methanol in the synthetic tower are decomposed after contacting the carbonyl iron, thus causing catalyst deactivation and catalyst poisoning, iron poisoning causes the synthetic reaction to generate a large amount of synthetic by-products such as wax, which affects the preparation output of methanol, and therefore, it is necessary to remove part of the carbonyl iron carried by the synthetic gas before the synthetic gas enters the reaction tube to protect the catalysts.

[0003] The patent with the publication number CN201106028Y discloses a methanol synthesis tower with a carbon steel protective layer, which comprises a shell, a gas inlet pipe at the top of the shell, a gas distributor on the inner side of the top of the shell, a gas collector at the bottom of the shell, an upper tube sheet fixed in the upper part of the cavity of the shell, a lower tube sheet fixed in the lower part of the cavity of the shell, a heat exchange cavity formed between the upper tube sheet and the lower tube sheet, a distribution plate fixed on the inner wall of the heat exchange cavity, heat exchange medium inlet and outlet pipelines arranged on the outer shell of the heat exchange cavity, reaction tubes installed between the upper tube sheet and the lower tube sheet, alumina balls filled between the lower tube sheet and the gas collector, and a catalyst protective layer for removing carbonyl compounds arranged in the gas passage in front of the upper tube sheet.

[0004] The technical scheme has the following disadvantages: the methanol synthesis tower is a large device, and the interior of the device is in a high-temperature and high-pressure working state during operation, and therefore, the catalyst protective layer gradually deactivates after a long time of reaction in the environment, and thus, the protective agent in the synthetic tower needs to be periodically replaced, the protective layer is arranged above the upper tube sheet, and no corresponding auxiliary structure is provided to enable workers to enter the tower for replacement, and thus, the protective agent replacement is inconvenient.

[0005] No effective solution has been proposed for the problems in the related art. UTILITY MODEL CONTENTS

[0006] The utility model discloses a synthetic tower upper pipe plate area with catalyst protection device, and solves the technical problems as follows: the existing synthetic tower catalyst protection layer is inconvenient to replace after deactivation when using.

[0007] The utility model discloses a synthetic tower upper pipe plate area with catalyst protection device, and solves the technical problems as follows: the existing synthetic tower catalyst protection layer is inconvenient to replace after deactivation when using.

[0008] A synthetic tower upper pipe plate area with catalyst protection device, including jar body, the jar body top installs the exhaust hole, jar body top one side installs the gas distributor, jar body one side installs the operation mouth, jar body inside installs the trestle at operation mouth bottom, the jar body is provided with operation table under the trestle, the jar body inner wall is fixedly connected with silk screen under operation table, the silk screen below is provided with the upper pipe plate, and the reaction layer is arranged between the silk screen and the upper pipe plate.

[0009] As a further scheme of the utility model: the trestle top end is fixedly connected with the jar body of one side below the operation mouth, and the width is greater than the diameter of the operation mouth, and the trestle bottom end is fixedly connected with the operation table top end.

[0010] As a further scheme of the utility model: the operation table includes the side ring of jar body inner wall fixed connection, the main stop board is fixedly connected with the side ring at the trestle bottom surface, and both ends of the main stop board one side vertical direction are fixedly connected with the side stop board.

[0011] As a further scheme of the utility model: the main stop board and the side stop board surface are evenly provided with the gas passing hole.

[0012] As a further scheme of the utility model: the mesh diameter of silk screen is less than 4.5 millimeters, and the silk screen distance operation table bottom surface is 40 centimeters.

[0013] As a further scheme of the utility model: the upper pipe plate top end is communicated with the reaction layer, and the reaction layer is communicated with the silk screen.

[0014] The utility model discloses a synthetic tower upper pipe plate area with catalyst protection device, and solves the technical problems as follows: the existing synthetic tower catalyst protection layer is inconvenient to replace after deactivation when using.

[0015] By setting the operation opening which can be accessed by people on one side of the top end of the tank body, installing the ladder on the lower side of the operation opening in the tank body, and fixing the operation table on the bottom end of the ladder, and setting the wire mesh under the operation table, when the catalyst protection layer in the synthetic tower is deactivated, the staff can enter the tank body by means of the operation opening and the ladder, and conveniently replace the protection agent stacked above the wire mesh by means of the operation table, so that the convenience degree when the protection agent is replaced is improved, and the purpose is to long-term maintain the activity of the catalyst protection agent, improve the quality stability of the synthesized methanol, and further, set the reaction layer between the wire mesh and the upper tube plate, so that sufficient reaction space and time are reserved for the decomposition of the protection agent, thereby improving the protection effect on the catalyst in the dimension of the iron removal effect. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings.

[0017] Figure 1 It is the whole structure schematic diagram of the utility model;

[0018] Figure 2 It is the local broken view of the operation opening of the utility model;

[0019] Figure 3 It is the local broken view of the gas distributor of the utility model;

[0020] Figure 4 It is the detail enlarged view of A in the utility model Figure 3

[0021] In the drawing: 1, tank body; 2, exhaust hole; 3, gas distributor; 4, operation opening; 5, ladder; 6, operation table; 61, side ring; 62, main stop plate; 63, side stop plate; 64, air hole; 7, wire mesh; 8, upper tube plate; 9, reaction layer. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] As Figures 1 to 4 ​As shown, a catalyst protection device for the upper tube plate area of a synthesis tower comprises a tank body 1, an exhaust hole 2 is installed on the top of the tank body 1, a gas distributor 3 is installed on one side of the top of the tank body 1, and an operating port 4 is installed on the other side of the top of the tank body 1, a ladder 5 is installed at the bottom of the operating port 4 in the tank body 1, an operating table 6 is arranged below the ladder 5 in the tank body 1, a wire mesh 7 is fixedly connected to the inner wall of the tank body 1 below the operating table 6, an upper tube plate 8 is arranged below the wire mesh 7, and a reaction layer 9 is arranged between the wire mesh 7 and the upper tube plate 8.

[0024] It should be noted that the synthesis tower is of an existing structure, so the reaction tube, lower tube plate, baffle plate and catalyst outlet at the bottom of the tank body 1 are not shown, specifically, the diameter of the tank body 1 is four meters, the diameters of the gas distributor 3 for connecting the synthesis gas and the operating port 4 for the workers to enter the inside of the tank body 1 are about 0.6 meters, so the operating port 4 can conveniently enable the workers to enter the inside of the tank body 1, thereby providing support for subsequent protection agent replacement.

[0025] The top end of the ladder 5 is below the operating port 4, and the width of the ladder 5 is greater than the diameter of the operating port 4, and the bottom of the ladder 5 is fixedly connected to the top end of the operating table 6;

[0026] It should be noted that the operating port 4 is in a sealed state during the use of the synthesis tower, so as to maintain the high-temperature and high-pressure closed structure required for its work, and when the protection agent is deactivated, the workers can open the bolts installed on the side of the operating port 4, and directly reach the operating table 6 along the adjacent ladder 5, so as to facilitate the replacement of the protection agent.

[0027] The operating table 6 comprises a side ring 61 fixedly connected to the inner wall of the tank body 1, a main stop plate 62 is fixedly connected to the bottom surface of the ladder 5, side stop plates 63 are fixedly connected to both sides of the main stop plate 62 in the vertical direction, and air passing holes 64 are uniformly arranged on the surfaces of the main stop plate 62 and the side stop plates 63;

[0028] It should be noted that when the workers fall along the ladder 5 to the operating table 6, they can reach various positions of the wire mesh 7 by means of the main stop plate 62 and the two side stop plates 63, since the protection agent is a granular accumulation, and the wire mesh 7 has low support stability, and the amount of protection agent replacement is large, so the workers cannot stand in the protection agent for a long time during the actual replacement of the protection agent, and therefore the main stop plate 62 and the two side stop plates 63 can provide convenient standing space for the workers during the replacement process; in addition, the operating table 6 is provided with the air passing holes 64, so that the synthesis gas can smoothly pass through the protection agent layer when the tank body 1 is sealed and worked, thereby avoiding the shielding of the gas passage during the conventional process of synthesizing methanol; that is, the use of the ladder 5 and the operating table 6 makes the replacement of the protection agent of the synthesis tower more convenient, and does not affect the normal progress of the synthesis reaction.

[0029] The mesh diameter of the wire mesh 7 is less than 4.5 millimeters, and the distance between the wire mesh 7 and the bottom surface of the operating table 6 is 40 centimeters.

[0030] It should be noted that the protective agent of the catalyst is preferably MG-921 protective agent, and the particle size thereof is a square structure with a side length of 4.5 mm. The wire mesh 7 always supports the storage of the protective agent. Specifically, when the synthesis gas enters the tank body 1, the volatile carbonyl iron contained in the tank body 1 will decompose with the protective agent, so that the iron that can deactivate the catalyst at the bottom of the tank body 1 is intercepted at the protective layer, thereby achieving the protection of the catalyst for methanol synthesis. In addition, the laying height of the protective agent is 30 cm, that is, 3.8 cubic meters of protective agent is injected into the synthesis tower, and the service life thereof is about four years, which is adapted to the service life of the active bottom catalyst. After deactivation, the staff needs to replace the protective agent through the operation port 4.

[0031] The top end of each gas inlet of the upper tube plate 8 is in communication with the reaction layer 9, and the reaction layer 9 is in communication with the wire mesh 7.

[0032] It should be noted that the synthesis gas introduced into the tank body 1 needs a certain space and time for the iron removal decomposition reaction after contacting with the protective agent layer. Therefore, the reaction layer 9 in communication with the wire mesh 7 is arranged between the reaction tubes at the upper tube plate 8 where the synthesis gas enters, so as to reserve a certain reaction space and time for the iron removal reaction, so as to improve the iron removal effect. Higher iron removal rate can effectively improve the protection effect of the bottom catalyst.

[0033] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage of the present application.

Claims

1. A catalyst protection device for the upper tube sheet region of a synthesis column, comprising a tank body (1), a gas exhaust hole (2) is installed on the top of the tank body (1), a gas distributor (3) is installed on one side of the top of the tank body (1), characterized in that, The tank body (1) is provided with an operation opening (4) on one side, a ladder (5) is arranged inside the tank body (1) and at the bottom of the operation opening (4), an operation table (6) is arranged below the ladder (5), a wire mesh (7) is fixedly connected to the inner wall of the tank body (1) below the operation table (6), an upper tube plate (8) is arranged below the wire mesh (7), and a reaction layer (9) is arranged between the wire mesh (7) and the upper tube plate (8).

2. A catalyst protection device for the region of the tube sheet of a synthesis column according to claim 1, characterized in that The top end of the ladder (5) is fixedly connected to the tank body (1) below one side of the operation opening (4), and the width is greater than the diameter of the operation opening (4); the bottom end of the ladder (5) is fixedly connected to the top end of the operation table (6).

3. A catalyst protection device for the area of the tube sheet on a synthesis column according to claim 1, characterized in that, The operation table (6) comprises a side ring (61) fixedly connected to the inner wall of the tank body (1), a main stop plate (62) fixedly connected to the bottom surface of the ladder (5), and side stop plates (63) fixedly connected to both ends of the main stop plate (62) in the vertical direction.

4. A catalyst protection device for the area of the tube sheet on a synthesis column according to claim 3, characterized in that The main stop plate (62) and the side stop plates (63) are uniformly provided with air passing holes (64) on the surfaces.

5. A catalyst protection device for the area of the tube sheet on a synthesis column according to claim 1, characterized in that, The mesh diameter of the wire mesh (7) is less than 4.5 mm, and the distance between the wire mesh (7) and the bottom surface of the operation table (6) is 40 cm.

6. A catalyst protection device for the area of the tube sheet on a synthesis column according to claim 1, characterized in that, The top end of the upper tube plate (8) is communicated with the reaction layer (9), and the reaction layer (9) is communicated with the wire mesh (7).

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