Methanol synthesis tower with novel ring pipe structure

Abstract

The utility model relates to a methanol synthesis tower with a novel ring pipe structure, which aims at solving the technical problem of how to uniformly enter the methanol synthesis tower from the water side at present, and adopts the technical scheme that the ring pipe structure is arranged at the middle lower part of the side wall of the methanol synthesis tower; the annular pipe structure comprises an equal-diameter tee joint, distribution pipes, a first connecting pipe section, a second connecting pipe section and a third connecting pipe section, the first connecting pipe section, the second connecting pipe section and the third connecting pipe section are sequentially connected end to end to form a circle of annular pipe, the pipe diameters of the annular pipe are sequentially reduced, and the annular pipe is fixedly arranged on the lower portion of the outer side wall of the tower. The first connecting pipe section is communicated with a descending pipe opening of the steam-water separator, and a steam inlet and an emptying opening are formed in the third connecting pipe section. A plurality of distribution pipes are uniformly arranged on the annular pipe structure, so that boiler feed water can be uniformly sprayed into the methanol synthesis tower, the water side of the methanol synthesis tower can uniformly enter the methanol synthesis tower, and the operation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of methanol synthesis equipment, and specifically relates to a methanol synthesis tower with a novel ring tube structure. Background Art

[0002] Process flow of methanol synthesis unit: The synthesis gas obtained after compression by the methanol synthesis gas compressor enters the methanol synthesis tower after being heated in the shell side of the gas-to-gas heat exchanger. The synthesis gas contacts the methanol synthesis catalyst in the tube side of the methanol synthesis tower and undergoes a chemical reaction to generate methanol, releasing a large amount of heat during the reaction. The synthesis gas after the reaction is discharged from the gas outlet at the bottom of the methanol synthesis tower, enters the tube side of the gas-to-gas heat exchanger for cooling, enters the water cooler for cooling, and then enters the methanol separator for gas-liquid separation. The synthesis gas leaving the methanol separator is called circulating gas. The circulating gas returns to the methanol synthesis gas compressor, and is compressed by the compressor together with the fresh synthesis gas, and then sent back to the methanol synthesis unit, thereby realizing the circulation of the gas phase in the methanol synthesis unit. The liquid methanol separated at the bottom of the methanol separator is treated by the methanol distillation unit to obtain the refined methanol product.

[0003] Steam-water circulation process of by-product steam of methanol synthesis tower: boiler feed water in the shell of methanol synthesis tower absorbs the heat released by the reaction and then vaporizes to become a steam-water mixture, which is then sent to the steam-water separator for steam-water separation. The separated steam is transported to the steam network, and the separated water is returned to the methanol synthesis tower. The water used to maintain a stable liquid level in the steam-water separator is supplemented by boiler feed water.

[0004] How to better realize the water side of the methanol synthesis tower entering the methanol synthesis tower is a key issue in the steam-water circulation process. Utility Model Content

[0005] The utility model aims to solve the above problems and provides a methanol synthesis tower with a novel ring tube structure.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A methanol synthesis tower with a novel annular tube structure is provided. A synthesis gas inlet is provided at the upper end of the methanol synthesis tower, a synthesis gas outlet is provided at the lower end, a steam-water mixture outlet is provided at the upper part of the side wall, the steam-water mixture outlet is connected to a steam-water separator, and an annular tube structure is provided at the middle and lower part of the side wall of the methanol synthesis tower.

[0008] Furthermore, the annular pipe structure includes an equal-diameter tee, a plurality of distribution pipes, a first connecting pipe section, two primary reducers, two second connecting pipe sections, two secondary reducers and a third connecting pipe section. The two ends of the first connecting pipe section are respectively connected to the second connecting pipe section through a primary reducer, and the other ends of the two second connecting pipe sections are respectively connected to the two ends of the third connecting pipe section through a secondary reducer. The first connecting pipe section, the second connecting pipe section and the third connecting pipe section are connected to form a circle of annular pipes, which are fixed on the lower part of the outer wall of the methanol synthesis tower. The distribution pipe is a U-shaped structure, the lower end of the distribution pipe is connected to the annular pipe, and the upper end passes through the side wall of the methanol synthesis tower and is inserted into the tower. The plurality of distribution pipes are evenly arranged along the annular pipe. The first connecting pipe section is connected to the downcomer outlet coming out of the steam-water separator through an equal-diameter tee. The upper side of the third connecting pipe section is provided with a steam inlet, and the bottom surface is provided with a drain outlet.

[0009] Furthermore, the diameter of the second connecting pipe section is smaller than the diameter of the first connecting pipe section, and the diameter of the third connecting pipe section is smaller than the diameter of the second connecting pipe section.

[0010] Furthermore, the number of the distribution pipes is 4-8.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The annular tube structure of the utility model is evenly provided with a plurality of distribution pipes, so that the boiler feed water can be evenly sprayed into the methanol synthesis tower, and the water side of the methanol synthesis tower can be evenly entered into the methanol synthesis tower, thereby improving the operation efficiency;

[0013] 2. The diameter of the annular pipe structure of the utility model is reduced successively, and the flow velocity is increased by reducing the flow area, thereby offsetting the influence of the flow resistance, ensuring uniform flow in the pipeline, and not causing a short circuit phenomenon with no fluid in some parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram of the steam-water circulation system of the methanol synthesis tower of the utility model;

[0015] Figure 2 This is a side view of a methanol synthesis tower of the utility model;

[0016] Figure 3 It is a top view of the ring tube structure of the methanol synthesis tower of the utility model;

[0017] 1. Annular pipe structure; 2. Synthesis gas inlet; 3. Synthesis gas outlet; 4. Soda-water mixture outlet; 5. Steam inlet; 6. Downcomer outlet; 7. Drain outlet; 8. Methanol synthesis tower; 9. Equal diameter tee; 10. Distribution pipe; 11. First connecting pipe section; 12. Primary reducer; 13. Second connecting pipe section; 14. Secondary reducer; 15. Third connecting pipe section. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Example 1

[0020] like Figure 1-3 As shown, a methanol synthesis tower with a novel annular pipe structure is provided. A synthesis gas inlet 2 is provided at the upper end of the methanol synthesis tower 8, a synthesis gas outlet 3 is provided at the lower end, a steam-water mixture outlet 4 is provided at the upper part of the side wall, and the steam-water mixture outlet 4 is communicated with a steam-water separator. An annular pipe structure 1 is provided at the middle and lower part of the side wall of the methanol synthesis tower 8. The annular pipe structure 1 includes an equal-diameter tee 9, 6 distribution pipes 10, a first connecting pipe section 11, two primary reducers 12, two second connecting pipe sections 13, two secondary reducers 14 and a third connecting pipe section 15. The two ends of the first connecting pipe section 11 are respectively connected to the second connecting pipe section 13 through the primary reducer 12, and the other ends of the two second connecting pipe sections 13 are respectively connected to the two ends of the third connecting pipe section 15 through the secondary reducer 14. The first connecting pipe section 11 and the second connecting pipe section 13 are respectively connected to the two ends of the third connecting pipe section 15 through the secondary reducer 14. The section 13 and the third connecting section 15 are connected to form a circle of annular pipes. The diameter of the second connecting section 13 is smaller than the diameter of the first connecting section 11, and the diameter of the third connecting section 15 is smaller than the diameter of the second connecting section 13. The purpose is to increase the flow rate by reducing the flow area, thereby offsetting the influence of the process resistance, ensuring uniform flow in the pipeline, and not causing a short circuit phenomenon with no fluid in some parts. It is fixed at the lower part of the outer wall of the methanol synthesis tower 8. The distribution pipe 10 is a U-shaped structure. The lower end of the distribution pipe 10 is connected to the annular pipe, and the upper end passes through the side wall of the methanol synthesis tower 8 and is inserted into the tower. The 6 distribution pipes 10 are evenly arranged along the annular pipe. The first connecting section 11 is connected to the downcomer 6 coming out of the steam-water separator through an equal-diameter tee 9. The upper side of the third connecting section 15 is provided with a steam inlet 5, and the bottom surface is provided with a drain port 7.

[0021] The number of the distribution pipes 10 can also be any value between 4 and 8.

[0022] The working process of this utility model:

[0023] When the utility model is used, the synthesis gas enters the methanol synthesis tower 8 from the synthesis gas inlet 2, and after the reaction in the pipe process of the methanol synthesis tower 8, the synthesis gas exits the methanol synthesis tower from the synthesis gas outlet 3. After the boiler feed water is added to the steam-water separator, it enters the first connecting pipe section 11 from the top to the bottom through the downcomer from the steam-water separator through the downcomer port 6 and the equal-diameter tee 9, and flows to the second connecting pipe section 13 and the third connecting pipe section 15 in sequence. The pipe diameter decreases from the first connecting pipe section 11 to the third connecting pipe section 15 in sequence, with the purpose of increasing the flow rate by reducing the flow area, thereby offsetting the influence of the process resistance, ensuring uniform flow in the pipeline, and not causing a short circuit phenomenon in which there is no fluid in a part. The feed water in the annular pipe enters from one end of the distribution pipe 10, and is sprayed out from the other end, and is sprayed into the methanol synthesis tower 8 evenly. After absorbing heat in the tower, it becomes a steam-water mixture, and exits the methanol synthesis tower from the steam-water mixture outlet 4. When the methanol synthesis unit is started up, medium-pressure superheated steam is introduced from the steam inlet 5. The medium-pressure superheated steam is used as a heat source to heat the steam-water circulation in the methanol synthesis tower 8. The drain port 7 of the annular pipe structure can continuously or intermittently discharge a small amount of boiler feed water to the outside of the steam-water circulation system.

[0024] The number of distribution pipes 10 can be adjusted accordingly as the size of the annular pipe is enlarged or reduced. When the specifications of the methanol synthesis tower 8 and the annular pipe are both small, the number of distribution pipes 10 can be reduced accordingly; when the specifications of the methanol synthesis tower 8 and the annular pipe are both large, the number of distribution pipes 10 can be increased accordingly.

Claims

1. A methanol synthesis tower with a novel annular tube structure, wherein a synthesis gas inlet (2) is provided at the upper end of the methanol synthesis tower (8), a synthesis gas outlet (3) is provided at the lower end, and a steam-water mixture outlet (4) is provided at the upper part of the side wall, wherein the steam-water mixture outlet (4) is connected to a steam-water separator, characterized in that: A ring pipe structure (1) is provided at the lower middle portion of the side wall of the methanol synthesis tower (8).

2. A methanol synthesis tower with a novel ring tube structure according to claim 1, characterized in that: The annular pipe structure (1) comprises an equal-diameter tee (9), a plurality of distribution pipes (10), a first pipe section (11), two primary reducers (12), two second pipe sections (13), two secondary reducers (14) and a third pipe section (15); the two ends of the first pipe section (11) are respectively connected to the second pipe section (13) via the primary reducer (12); the other ends of the two second pipe sections (13) are respectively connected to the two ends of the third pipe section (15) via the secondary reducer (14); the first pipe section (11), the second pipe section ( The distribution pipe (10) is a U-shaped structure. The lower end of the distribution pipe (10) is connected to the annular pipe, and the upper end passes through the side wall of the methanol synthesis tower (8) and is inserted into the tower. The plurality of distribution pipes (10) are evenly arranged along the annular pipe. The first connecting pipe section (11) is connected to the downcomer (6) coming out of the steam-water separator through an equal-diameter tee (9). The upper side of the third connecting pipe section (15) is provided with a steam inlet (5), and the bottom surface is provided with a drain outlet (7).

3. A methanol synthesis tower with a novel ring tube structure according to claim 2, characterized in that: The diameter of the second connecting pipe section (13) is smaller than the diameter of the first connecting pipe section (11), and the diameter of the third connecting pipe section (15) is smaller than the diameter of the second connecting pipe section (13).

4. The methanol synthesis tower with a novel ring tube structure according to claim 2, characterized in that: The number of the distribution pipes (10) is 4-8.

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