Synthesis tower preheating device

Abstract

The utility model relates to the technical field of methanol synthesis, in particular to a synthesis tower preheating device which comprises a recycle gas preheater, a buffer tank connected to the recycle gas preheater through a first connecting pipe, a fresh gas preheater connected to the buffer tank through a second connecting pipe, a second communicating pipe connected to the fresh gas preheater through a gas inlet pipe, and a gas inlet pipe connected to the second communicating pipe. The two ends of the second communicating pipe are connected with a first fine desulfurization tank and a second fine desulfurization tank, the first fine desulfurization tank and the second fine desulfurization tank are connected with a first communicating pipe, the first communicating pipe is connected with a third connecting pipe, and the third connecting pipe is communicated with the air inlet pipe. The content of sulfur is less than 100ppb after desulfurization in the desulfurization tank, so that the catalyst cannot be poisoned, the catalyst enters the synthesis tower for reaction after heat exchange in the fresh gas preheater, the inlet temperature of the synthesis tower is increased, the service life of the catalyst is prolonged, the yield of crude methanol is increased, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of methanol synthesis, in particular to a synthesis tower preheating device. Background Art

[0002] During methanol synthesis, the fresh gas from the compression section is preheated in the fresh gas preheater and then desulfurized in the fine desulfurization tank; the circulating gas from the compression section is preheated in the circulating gas preheater and then mixed with the fresh gas after fine desulfurization into the buffer tank and then enters the methanol synthesis tower. The temperature of the mixed gas entering the synthesis tower is 190°C lower at the beginning of the use of the synthesis catalyst. The initial efficiency of the catalyst in the upper part of the synthesis tower is low, and the service life of the synthesis catalyst is affected. If the fresh gas preheater tube leaks and causes fresh gas to enter the circulating gas, the fresh gas that has not passed through the desulfurization tank is mixed with the circulating gas and enters the synthesis tower, causing the synthesis catalyst to be poisoned by sulfide. If the catalyst is poisoned, the service life is shortened, the methanol production is reduced, the frequency of catalyst replacement is increased, the catalyst poisoning reaction activity decreases, the production is reduced, the by-product steam is reduced, and the production energy consumption increases. Utility Model Content

[0003] The utility model aims to solve the disadvantages of the prior art that affect the service life of the catalyst, and proposes a synthesis tower preheating device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A synthesis tower preheating device is designed, including a circulating gas preheater, the circulating gas preheater is connected to a buffer tank via a first connecting pipe, the buffer tank is connected to a fresh gas preheater via a second connecting pipe, the fresh gas preheater is connected to a second conducting pipe via an air intake pipe, both ends of the second conducting pipe are connected to a first fine desulfurization tank and a second fine desulfurization tank, the first fine desulfurization tank and the second fine desulfurization tank are connected to a first conducting pipe, the first conducting pipe is connected to a third connecting pipe, and the third connecting pipe is communicated with the air intake pipe.

[0006] Preferably, a connecting pipe is provided to connect the gas outlet and the exhaust port of the first fine desulfurization tank and the second fine desulfurization tank.

[0007] Preferably, a second stop valve is provided on each of the two connecting pipes.

[0008] Preferably, a first stop valve is provided on the air intake pipe.

[0009] Preferably, a third stop valve is provided on the third connecting pipe.

[0010] Preferably, the circulating gas preheater is connected to the upper gas outlet of the fresh gas preheater and is provided with an outlet pipe.

[0011] Preferably, an exhaust pipe is provided at the lower end gas outlet of the circulating gas preheater and the fresh gas preheater in communication with each other.

[0012] The utility model proposes a synthesis tower preheating device, which has the beneficial effect that the fresh gas first passes through the desulfurization tank for desulfurization, and then passes through the fresh gas preheater for heat exchange before entering the synthesis tower for reaction, thereby increasing the synthesis tower inlet temperature, increasing the service life of the catalyst, increasing the crude methanol output, and reducing energy consumption. If the fresh gas preheater leaks, the sulfur content of the fresh gas passing through the desulfurization tank is less than 100ppb, and the catalyst will not be poisoned, thereby extending the service life of the catalyst, increasing the crude methanol output, and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of a synthesis tower preheating device.

[0014] In the figure: 1. circulating gas preheater; 2. fresh gas preheater; 3. first fine desulfurization tank; 4. second fine desulfurization tank; 5. buffer tank; 6. first connecting pipe; 7. second connecting pipe; 8. third connecting pipe; 9. first conducting pipe; 10. connecting pipe; 11. second conducting pipe; 12. air inlet pipe; 13. first stop valve; 14. second stop valve; 15. third stop valve; 16. air outlet pipe; 17. exhaust pipe. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in 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.

[0016] Reference Figure 1 A synthesis tower preheating device comprises a circulating gas preheater 1, the circulating gas preheater 1 is connected to a buffer tank 5 through a first connecting pipe 6, the buffer tank 5 is connected to a fresh gas preheater 2 through a second connecting pipe 7, the fresh gas preheater 2 is connected to a second conducting pipe 11 through an air inlet pipe 12, the two ends of the second conducting pipe 11 are connected to a first fine desulfurization tank 3 and a second fine desulfurization tank 4, the first fine desulfurization tank 3 and the second fine desulfurization tank 4 are connected to a first conducting pipe 9, the first conducting pipe 9 is connected to a third connecting pipe 8, and the third connecting pipe 8 is communicated with the air inlet pipe 12, the shell side process of the fresh gas preheater tube 2 is changed, the fresh gas first passes through the first fine desulfurization tank 3 and the second fine desulfurization tank 4, and then passes through the fresh gas preheater 2 for heat exchange, and then enters the buffer tank 5, and finally enters the synthesis tower for reaction, thereby improving the inlet temperature of the synthesis tower and the service life of the catalyst, increasing the crude methanol output and reducing energy consumption. At the same time, if the fresh gas preheater 2 leaks, the sulfur content of the fresh gas passing through the desulfurization tank is less than 100 ppb and the catalyst will not be poisoned, thereby extending the service life of the catalyst, increasing the crude methanol output and reducing energy consumption.

[0017] The gas outlets of the first fine desulfurization tank 3 and the second fine desulfurization tank 4 are connected to the exhaust ports by a connecting pipe 10. The two connecting pipes 10 are both provided with a second stop valve 14. The air inlet pipe 12 is provided with a first stop valve 13. The third connecting pipe 8 is provided with a third stop valve 15.

[0018] The circulating gas preheater 1 is connected to the fresh gas preheater 2 at its upper end and is provided with an outlet pipe 16. The synthesis gas flowing out of the outlet pipe 16 is cooled and collected after removing air.

[0019] The circulating gas preheater 1 is connected to the fresh gas preheater 2 at the lower end thereof and is provided with an exhaust pipe 17, and the exhaust pipe 17 is connected to the outlet of the synthesis tower for unified exhaust.

[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A synthesis tower preheating device, comprising a circulating gas preheater (1), characterized in that: The circulating gas preheater (1) is connected to a buffer tank (5) via a first connecting pipe (6), the buffer tank (5) is connected to a fresh gas preheater (2) via a second connecting pipe (7), the fresh gas preheater (2) is connected to a second conducting pipe (11) via an air intake pipe (12), both ends of the second conducting pipe (11) are connected to a first fine desulfurization tank (3) and a second fine desulfurization tank (4), the first fine desulfurization tank (3) and the second fine desulfurization tank (4) are connected to a first conducting pipe (9), the first conducting pipe (9) is connected to a third connecting pipe (8), and the third connecting pipe (8) is connected to the air intake pipe (12).

2. A synthesis tower preheating device according to claim 1, characterized in that: A connecting pipe (10) is provided to connect the gas outlets and exhaust ports of the first fine desulfurization tank (3) and the second fine desulfurization tank (4).

3. A synthesis tower preheating device according to claim 2, characterized in that: The two connecting pipes (10) are both provided with a second stop valve (14).

4. A synthesis tower preheating device according to claim 1, characterized in that: The air intake pipe (12) is provided with a first stop valve (13).

5. A synthesis tower preheating device according to claim 1, characterized in that: The third connecting pipe (8) is provided with a third stop valve (15).

6. A synthesis tower preheating device according to any one of claims 1 to 5, characterized in that: The circulating gas preheater (1) is connected to the fresh gas preheater (2) at its upper gas outlet and is provided with an outlet pipe (16).

7. A synthesis tower preheating device according to claim 6, characterized in that: The circulating gas preheater (1) is connected to the fresh gas preheater (2) at its lower gas outlet and is provided with an exhaust pipe (17).

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