A Shell gasification device temperature-bearing inner shell protection system

Abstract

The present invention discloses a Shell gasification device temperature-bearing inner shell protection system, wherein a connecting pipe is connected to the outer top of the temperature-bearing inner shell, the other end of the connecting pipe is connected to a first clamp, the other end of the first clamp is connected to a pressure-equalizing pipe, the other end of the pressure-equalizing pipe is connected to a second clamp, the other end of the second clamp is connected to a pressure relief pipe; a first bursting disc and a second bursting disc are clamped in the first clamp and the second clamp, respectively; and a pressure-equalizing hole is provided on the pressure-equalizing pipe. By adding a first bursting disc and providing a pressure-equalizing hole on the pressure-equalizing pipe, and by using nitrogen to block the crude synthesis gas in the temperature-bearing inner shell after the first bursting disc explodes, the shutdown of the production device due to the quality problem of the bursting disc itself is fully avoided, and at the same time, the temperature-bearing inner shell can still be protected after the first bursting disc explodes.

Description

Technical Field

[0001] The invention relates to the field of coal gasification, and in particular to a temperature-bearing inner shell protection system of a Shell gasification device. Background Art

[0002] In Shell's downward water-quenched coal gasification unit, due to the characteristics of its process, the gasifier adopts a double-shell type, such as Figures 1 to 3 As shown, it includes a pressure-bearing outer shell 1, which can withstand a pressure of 4.0MPa; and a temperature-bearing inner shell 2, whose pressure-bearing capacity is 65kPa; the pressure-bearing outer shell 1 is connected to the temperature-bearing inner shell 2 through a water seal 3 at the bottom, and an atomic explosion fragment 4 is installed on the top of the temperature-bearing inner shell 1. Under normal operating conditions, the inside and outside of the temperature-bearing inner shell 1 are connected through the water seal 3, and the pressure difference between the inside and outside is controlled within 35kPa; affected by the operation cycle and production conditions of the device, the water seal 3 may be blocked. When the water seal 3 cannot play a connecting role, the pressure inside and outside of the temperature-bearing inner shell 2 cannot be adjusted, and it will be damaged after the pressure exceeds 65kPa. In order to protect the temperature-bearing inner shell 2 from being damaged, when the pressure difference is greater than 48kPa or less than -50kPa, the atomic explosion fragment 4 explodes, and the crude synthesis gas in the temperature-bearing inner shell 2 is passed into the pressure-bearing outer shell 1 through the connecting pipe 5 and the pressure relief pipe 9, so that the inside and outside of the temperature-bearing inner shell 2 are connected to avoid damage to the temperature-bearing inner shell 2. After the explosion of the atomic blast fragment 4, the device had to be shut down for replacement due to its installation location, causing huge losses to production operations.

[0003] However, in actual production, most of the damage to bursting discs is caused by defects in the bursting discs themselves or the shortening of their service life due to long-term operation, which results in unnecessary bursting discs. However, in order to ensure the safety of the device, the device can only be stopped to replace the bursting discs, which affects the long-term continuous operation of the equipment. Summary of the invention

[0004] The object of the present invention is to provide a temperature-bearing inner shell protection system for a Shell gasification device.

[0005] The present invention is implemented by the following technical solutions:

[0006] A Shell gasification device temperature-bearing inner shell protection system, a connecting pipe is connected to the outer top of the temperature-bearing inner shell, the other end of the connecting pipe is connected to a first clamp, the other end of the first clamp is connected to a pressure equalizing pipe, the other end of the pressure equalizing pipe is connected to a second clamp, the other end of the second clamp is connected to a pressure relief pipe; a first bursting disc and a second bursting disc are clamped in the first clamp and the second clamp respectively; a pressure equalizing hole is opened on the pressure equalizing pipe.

[0007] Preferably, the minimum length of the pressure equalizing tube is 100 mm.

[0008] Preferably, the minimum diameter of the pressure equalizing hole is 18 mm.

[0009] Preferably, a temperature sensor is installed on the edge of the pressure equalizing hole.

[0010] Preferably, an inert gas pipe is connected to the connecting pipe, and a regulating valve is installed on the inert gas pipe.

[0011] The advantages of the present invention are as follows: by adding a first bursting disc and opening a pressure equalizing hole on the pressure equalizing pipe, and by blocking the crude synthesis gas in the temperature-bearing inner shell by nitrogen after the first bursting disc explodes, the situation in which the production device is shut down due to the quality problem of the bursting disc itself is fully avoided, and at the same time, the function of protecting the temperature-bearing inner shell can still be maintained after the first bursting disc explodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the structure of Shell's downward water-quenched coal gasifier;

[0013] Figure 2 is a schematic diagram of the installation position of the bursting disc;

[0014] Figure 3 This is the installation diagram of the original design bursting disc;

[0015] Figure 4 It is a schematic diagram of the structure of the present invention;

[0016] Figure 5 It is a structural schematic diagram of the pressure equalizing tube of the present invention.

[0017] In the figure: a pressure-bearing outer shell 1, a temperature-bearing inner shell 2, a water seal 3, an atomic explosion fragment 4, a connecting pipe 5, a first clamp 6, a pressure equalizing pipe 7, a second clamp 8, a pressure relief pipe 9, a first bursting disc 10, a second bursting disc 11, a pressure equalizing hole 12, a temperature sensor 13, an inert gas pipe 14, and a regulating valve 15. DETAILED DESCRIPTION

[0018] like Figures 4 to 5 As shown, a Shell gasification device temperature-bearing inner shell protection system, a connecting pipe 5 is connected to the outer top of the temperature-bearing inner shell 2, the other end of the connecting pipe 5 is connected to the first clamp 6, the other end of the first clamp 6 is connected to the equalizing pipe 7, the other end of the equalizing pipe 7 is connected to the second clamp 8, the other end of the second clamp 8 is connected to the pressure relief pipe 9; the first clamp 6 and the second clamp 8 respectively clamp the first bursting disc 10 and the second bursting disc 11; the equalizing pipe 7 is provided with a pressure equalizing hole 12;

[0019] During operation, the pressure equalizing hole 12 is used to equalize the pressure between the outside of the temperature-bearing inner shell 2 and the connecting pipe 5, so as to achieve the effect of the bursting disc in the original design to block the connection between the inside and outside of the temperature-bearing inner shell 2. Since the pressure during the start-up and shutdown of the gasifier is adjusted to 0-4MPa, and there is a normal fluctuation of 5-35kPa during operation, if the pressure equalizing pipe 7 between the first bursting disc 10 and the second bursting disc 11 is not provided with the pressure equalizing hole 12 for pressure equalization, the space between the first bursting disc 10, the second bursting disc 11 and the pressure equalizing pipe 7 is a sealed space during installation, and its pressure is atmospheric pressure, which will cause the first bursting disc 10 and the second bursting disc 11 to explode during the start-up and pressure-increasing period of the gasifier, and cannot be used;

[0020] A temperature sensor 13 is installed at the edge of the pressure equalizing hole 12. When the first bursting disc 10 explodes due to its own quality problems, the pressure equalizing tube 7 is directly connected to the temperature-bearing inner shell 2, and the temperature of the temperature-bearing inner shell 2 is quickly transmitted to the pressure equalizing hole 12. The data measured by the temperature sensor 13 rises rapidly, and the central control room receives the relevant temperature signal.

[0021] An inert gas pipe 14 is connected to the connecting pipe 5, and a regulating valve 15 is installed on the inert gas pipe 14. When the first bursting piece 10 explodes due to its own quality problems, inert gas is introduced into the connecting pipe 5 through the inert gas pipe 14 to block the leakage of the crude synthesis gas in the temperature-bearing inner shell 2 from the pressure equalizing hole 12. At the same time, the amount of inert gas is adjusted by the regulating valve 15 to ensure that the inert gas can play a blocking role and at the same time ensure that the temperature of the connecting pipe 5 and the annular gap between the temperature-bearing inner shell 2 and the pressure-bearing outer shell 1 will not be reduced to too low, thereby ensuring that the gasifier can operate stably and efficiently.

[0022] Example

[0023] After the first bursting disc 10 explodes due to the quality problem of the bursting disc itself, the temperature sensor 13 detects the temperature rise and determines that the first bursting disc 10 explodes. At this time, the temperature in the temperature-bearing inner shell 2 is about 1200°C. Nitrogen with a temperature of 80°C and a pressure of 5.25±0.25MPa is injected into the connecting pipe 5 through the inert gas pipe 14. Since the pressure of the temperature-bearing inner shell 2 is 3.80MPa-4.35MPa under normal operation, and the nitrogen pressure is higher than that of the temperature-bearing inner shell 2, a large amount of nitrogen flows downward into the temperature-bearing inner shell 2 and is discharged downward along with the crude synthesis gas in the temperature-bearing inner shell 2, and a part of it is discharged to the outside of the temperature-bearing inner shell 2 from the pressure equalizing hole 12. Therefore, the nitrogen blocks the crude synthesis gas in the temperature-bearing inner shell 2 so that it will not be discharged from the pressure equalizing hole 12. At this time, the second bursting disc 11 can still play the role of blocking the connection between the inside and outside of the temperature-bearing inner shell 2, and it continues until the gasifier is shut down. During this period, the gasifier can still operate normally.

[0024] The temperature sensor 13 detects the temperature at the pressure equalizing pipe 7, and adjusts the opening of the regulating valve 15 through the central control room, thereby adjusting the amount of nitrogen, and controlling the temperature inside and outside the pressure equalizing hole 12 between 250°C and 300°C. After the temperature inside and outside the pressure equalizing hole 12 exceeds 300°C, there is a risk of leakage of the crude synthesis gas in the temperature-bearing inner shell 2, and it is necessary to increase the amount of nitrogen in time to ensure that it plays a role in blocking the crude synthesis gas in the temperature-bearing inner shell 2; after the temperature inside and outside the pressure equalizing hole 12 is lower than 250°C, there is a risk of affecting the normal operation of the gasifier due to the low temperature, and it is necessary to reduce the amount of nitrogen in time to ensure that it will not affect the normal operation of the gasifier.

[0025] Since the first clamp 6 and the second clamp 8 in the gasifier of the Shell downward water-quenched coal gasification device are of the same model, the clamp and the bursting disc are matched, which are YE100-0.05-450\316L produced by Chengdu Kaitian Electronics Co., Ltd., and the diameter of the pipes connected thereto are 100mm, after the two are connected through the pressure equalizing pipe 7, the bolts on both sides of the clamp need to be tightened by nuts to ensure that the bursting disc is clamped, so a certain operating space needs to be reserved between the two. According to the actual operating conditions, the minimum distance between the two is 100mm;

[0026] During the operation of the Shell gasification device heat-bearing inner shell protection system, the pressure-equalizing hole 12 must not only meet the pressure equalization on both sides of the first bursting disc 10 during the start-up of the gasifier, but also meet the pressure equalization of the pressure difference on both sides of the first bursting disc 10 caused by the annular gap pressure fluctuation between the heat-bearing inner shell 2 and the pressure-bearing outer shell 1 during the operation of the gasifier. Therefore, taking the internal pressure of the heat-bearing inner shell 2 as 3.85MPa as an example, the annular gap pressure between the heat-bearing inner shell 2 and the pressure-bearing outer shell 1 is the limit value of 4-4.5MPa, ensuring that the first bursting disc 10 does not explode. Under the premise of, through the ideal gas state equation and the isentropic flow mass flow formula, the minimum aperture of the pressure equalizing hole 12 is calculated to be about 18mm; and when the first bursting disc 10 explodes, the pressure equalizing hole 12 has this aperture, and a large amount of nitrogen flows downward into the temperature-bearing inner shell 2, and is discharged downward together with the crude synthesis gas in the temperature-bearing inner shell 2, and a small part of the nitrogen continues to be discharged from the pressure equalizing hole 12 until the gasifier is shut down, and the nitrogen introduced through the inert gas pipe 14 will not cause the second bursting disc 11 to explode;

[0027] Since the diameter of the pressure-equalizing tube 7 is constant, the pressure-equalizing hole 12 connects the inside and outside of the pressure-equalizing tube 7, that is, the inside of the pressure-equalizing tube 7 and the annular gap. When pressure fluctuations occur, the pressure-equalizing hole 12 is the only channel connecting the two. The longer the pressure-equalizing tube 7 is, the more gas needs to enter from the annular gap. To achieve pressure equalization on both sides of the pressure-equalizing hole 12 during the fluctuation process, the pressure-equalizing hole 12 needs to be larger. In addition to pressure equalization, the pressure-equalizing hole 12 also needs to perform nitrogen barrier after the first bursting piece 10 explodes. Therefore, the larger the pressure-equalizing hole 12 is, the greater the amount of nitrogen required when the nitrogen pressure is constant. Considering the production cost involved in the amount of nitrogen used, the smaller the pressure-equalizing hole 12 is, the lower the production cost. Therefore, in order to ensure that the pressure-equalizing effect can be achieved and the amount of nitrogen used is not high, in actual production, the length of the pressure-equalizing tube 7 is selected to be 100 mm, and the diameter of the pressure-equalizing hole 12 is selected to be 20 mm.

[0028] When the water seal 3 is clogged during actual use, if the first bursting disc 10 and the second bursting disc 11 do not explode, since the pressure equalizing pipe 7 is connected to the annular gap between the temperature-bearing inner shell 2 and the pressure-bearing outer shell 1 through the pressure equalizing hole 12, the two sides of the first bursting disc 10 are the internal and external pressures of the temperature-bearing inner shell 2. When the pressure difference between the internal and external pressures of the temperature-bearing inner shell 2 is greater than 48 kPa or less than -50 kPa, the first bursting disc 10 will explode. However, as the pressure of the temperature-bearing inner shell 2 continues to rise, and the pressure equalizing hole 12 is only 20 mm, the nitrogen discharged from the pressure equalizing hole 12 can almost If we ignore it, the second bursting piece 11 will also explode after the pressure difference between the inside and outside of the temperature-bearing inner shell 2 is greater than 48 kPa; if the first bursting piece 10 has already exploded when the water seal 3 is blocked, and the same as the above situation, the second bursting piece 11 will also explode after the pressure difference between the inside and outside of the temperature-bearing inner shell 2 is greater than 48 kPa; and in actual production, since the water seal 3 is also equipped with relevant detection and alarm in the central control system, the gasifier cannot operate normally after the water seal 3 is blocked, and the central control system performs relevant actions such as early warning and shutdown, and starts the car again after the water seal is unblocked.

[0029] The test site of the embodiment of the present invention is the Shell coal gasification device of Hulunbuir Jinxin Chemical Co., Ltd., which has been running for 6 consecutive months without any problem of bursting disc damage affecting the operation of the gasifier, and the effect is good.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A Shell gasification device temperature bearing inner shell protection system, characterized in that: A connecting pipe is connected to the top of the outer side of the temperature-bearing inner shell, and the other end of the connecting pipe is connected to the first clamper, the other end of the first clamper is connected to the pressure equalizing pipe, the other end of the pressure equalizing pipe is connected to the second clamper, and the other end of the second clamper is connected to the pressure relief pipe; the first bursting disc and the second bursting disc are clamped in the first clamper and the second clamper respectively; the first clamper and the second clamper are of the same model; a pressure equalizing hole is opened on the pressure equalizing pipe; the minimum length of the pressure equalizing pipe is 100mm; the minimum aperture of the pressure equalizing hole is 18mm; a temperature sensor is installed on the edge of the pressure equalizing hole; by adding the first bursting disc and opening the pressure equalizing hole on the pressure equalizing pipe, and blocking the crude synthesis gas in the temperature-bearing inner shell by nitrogen after the first bursting disc explodes, the production unit can be prevented from stopping due to the quality problem of the bursting disc itself, and the temperature-bearing inner shell can still be protected after the first bursting disc explodes.

2. A Shell gasification device temperature-bearing inner shell protection system according to claim 1, characterized in that: The connecting pipe is connected with an inert gas pipe, and a regulating valve is installed on the inert gas pipe.

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