Head for high temperature treatment of porous media

Abstract

The present application belongs to the technical field of high temperature treatment of porous medium, and relates to a head for high temperature treatment of porous medium, which is arranged at the lower part of a fluidized reactor and comprises a head shell, a head jacket arranged on the periphery of the head shell, a temperature control medium injected into the head jacket, a medium inlet arranged at the lower part of the head jacket, a medium outlet arranged at the upper part of the head jacket, the medium inlet and the medium outlet each being connected with a medium heating device, a fluidization gas inlet pipe connected with the lower part of the head shell, the top of the head shell being connected with the upper fluidization section of the fluidized reactor through a gas distribution plate, a first discharge port being arranged on the gas distribution plate, and a second discharge port being arranged at the bottom of the head shell. The present application can heat the fluidization gas passing through the head, avoid stress concentration of the porous medium when the fluidization gas at low temperature contacts the porous medium at high temperature, reduce the collapse of the porous medium pores or the breakage of the particles, and make the porous medium be well treated at high temperature and be convenient to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of head for high temperature treatment of porous medium, belong to the high temperature treatment technical field of porous medium. BACKGROUND

[0002] At present, in the polyolefin industry, supported catalyst is widely used due to its own advantages and good device applicability; among the many catalyst carriers, porous media can provide good chemical reaction sites for active components, and good product particle morphology is very beneficial to production operation; in the actual production and application of catalyst, a suitable porous medium for the existing device is first selected as the carrier of the catalyst, and then how to load the active component onto the porous medium is considered; the catalyst should not only have good polymerization characteristics, but also can well maintain the particle morphology of the porous medium.

[0003] Generally, porous media cannot be directly used in the preparation of catalysts, because untreated porous media have many poisons that can poison the active components, and the polymerization characteristics of the catalyst are also closely related to the chemical site arrangement of the porous media pore surface. Therefore, the porous media are dried and high-temperature treated before use, on the one hand to remove physically adsorbed poisons such as free water, continuous hydroxyl groups, double hydroxyl groups and free hydroxyl groups on the surface; on the other hand, a part of the surface chemical sites are removed for loading active components. Because the porous media will undergo many thermal processes during use, causing the collapse of the porous media pores and even the breakage of the particles, which will directly affect its use effect. Generally, the longer the thermal process time, the more concentrated the instantaneous stress, which is not conducive to the maintenance of its particle characteristics. Among the many thermal processes, high-temperature treatment is a key stage.

[0004] The high-temperature treatment method commonly used in the prior art is to place the porous media into a fluidized reactor with a gas distribution plate at the lower part, the gas distribution plate is located between the fluidization section and the head, the fluidized reactor is heated by raising the temperature, the fluidizing gas enters from the head, passes through the gas distribution plate, so that the porous media particles are in a fluidized state, then heated to a specified temperature, treated at high temperature for a certain time, and then cooled to complete the high-temperature treatment process. In the above treatment process, the temperature of the fluidization section is relatively high, and the temperature of the head is relatively low. When the fluidizing gas enters the head and then passes through the gas distribution plate into the fluidization section, the temperature of the fluidizing gas is still relatively low. When the low-temperature fluidizing gas contacts the high-temperature porous media, it is easy to cause stress concentration of the porous media, causing pore collapse or particle breakage, affecting the effect of high-temperature treatment. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a head for high-temperature treatment of a porous medium, so that the fluidized gas passing through the head is heated, and the contact between the fluidized gas at low temperature and the porous medium at high temperature is avoided to reduce the stress concentration of the porous medium, thereby reducing the collapse of the pores of the porous medium or the breakage of the particles, and facilitating the operation of the porous medium.

[0006] The head for high-temperature treatment of a porous medium is arranged at the lower part of a fluidized reactor and comprises a head shell, a head jacket arranged around the periphery of the head shell, a temperature control medium injected into the head jacket, a medium inlet arranged at the lower part of the head jacket, a medium outlet arranged at the upper part of the head jacket, the medium inlet and the medium outlet each being connected to a medium heating device, a fluidized gas inlet pipe connected to the lower part of the head shell, a gas distribution plate arranged at the top of the head shell and connected to the upper fluidized section of the fluidized reactor, and a discharge port one arranged on the gas distribution plate and a discharge port two arranged at the bottom of the head shell.

[0007] The fluidized gas can be air, nitrogen, argon or other inert gas, and the water content in the fluidized gas is less than 30 ppm.

[0008] In use, the medium heating device is first started to heat the temperature control medium to a required temperature, and then the temperature control medium is injected into the head jacket through the medium inlet to preheat the head jacket for a certain period of time. The fluidized gas is injected into the head shell through the fluidized gas inlet pipe, and the fluidized gas exchanges heat with the temperature control medium in the head jacket to be cooled. The cooled temperature control medium is discharged from the medium outlet to the medium heating device for heating and recycling. The heated fluidized gas is evenly distributed through the gas distribution plate and then enters the fluidized section to fully contact the porous medium in the fluidized section. The porous medium in the fluidized section is in a fluidized state under the action of the fluidized gas. The heated fluidized gas fully contacts the porous medium in the fluidized section to avoid stress concentration of the porous medium caused by a large temperature difference, effectively reducing the collapse of the pores of the porous medium or the breakage of the particles, and achieving good high-temperature treatment of the porous medium.

[0009] Preferably, the fluidized gas inlet pipe is connected to a flow guide pipe arranged inside the head shell, and the flow guide pipe is directed obliquely downward in the inner cavity of the head shell. The flow guide pipe guides the flow direction of the fluidized gas. In use, the fluidized gas is injected into the lower part of the inner cavity of the head shell through the flow guide pipe, and then flows from the lower part of the inner cavity of the head shell to the upper part of the head shell and then flows to the fluidized section through the gas distribution plate. The flow guide pipe increases the flow time and heating time of the fluidized gas in the head shell, and improves the heating effect of the fluidized gas.

[0010] Preferably, an adjusting valve is arranged on the fluidized gas inlet pipe to control the flow of the fluidized gas. In use, the fluidized gas can be injected into the head shell at a constant flow rate through the adjusting valve.

[0011] Preferably, the discharge port one is provided with a discharge valve one, when the high temperature treatment of the porous medium by the fluidized reactor is completed, the discharge valve one is opened, and the porous medium after high temperature treatment is discharged from the fluidized section into the head shell.

[0012] Preferably, the discharge port two is provided with a discharge valve two, when the high temperature treatment of the porous medium by the fluidized reactor is completed, the porous medium after high temperature treatment is discharged into the head shell, and the discharge valve two is opened to discharge the porous medium after high temperature treatment in the head shell to the external collecting device.

[0013] Preferably, the temperature control medium is heat conducting oil, and the heat conducting oil has good heat stability and heat transfer effect.

[0014] Preferably, the temperature of the head jacket is controlled at 50-350 DEG C, the temperature of the temperature control medium is raised to 50-350 DEG C by the medium heating device, and the temperature control medium after heating is injected into the head jacket to heat the head jacket, so that the temperature of the head jacket is controlled at 50-350 DEG C by controlling the temperature of the temperature control medium.

[0015] Preferably, the cross section of the head shell is circular, and the lower part of the head shell is in the shape of a necking, and the lower part of the head shell in the shape of a necking has a vertical surface on one side and an inclined surface on the other side. When the high temperature treatment of the porous medium by the fluidized reactor is completed, the porous medium after reaction is discharged from the discharge port two into the external collecting device, and the vertical surface and the inclined surface of the lower part of the head shell in the shape of a necking are beneficial to the flow of the porous medium to the discharge port two under the action of gravity, and reduce the residual amount of the porous medium in the head shell.

[0016] Preferably, the vertical surface of the head shell and the inclined surface of the head shell form an angle of 30-60 DEG.

[0017] Preferably, the angle between the flow guide pipe and the lower part of the vertical surface of the head shell is 45 DEG.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The head structure for high-temperature treatment of porous medium has reasonable structure, the fluidized gas injected into the head shell is heated by the heat conduction oil of the temperature control medium in the head jacket, the heated fluidized gas is evenly distributed by the gas distribution plate and then enters the fluidized section, the heated fluidized gas fully contacts the porous medium in the fluidized section, the porous medium in the fluidized section reaches a fluidized state under the action of the fluidized gas, the heated fluidized gas fully contacts the porous medium in the fluidized section, the stress concentration of the porous medium caused by the large temperature difference is avoided, the collapse of the porous medium pore or the particle breakage is effectively reduced, and the porous medium is well treated at high temperature; and the head structure is convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 , the head structure for high-temperature treatment of porous medium.

[0021] In the figure: 1, fluidized section; 2, gas distribution plate; 3, medium outlet; 4, head shell; 5, discharge port two; 6, discharge valve two; 7, medium inlet; 8, flow guide pipe; 9, regulating valve; 10, fluidized gas inlet pipe; 11, head jacket; 12, discharge valve one; 13, discharge port one. DETAILED DESCRIPTION

[0022] The head structure for high-temperature treatment of porous medium will be further described below in combination with the accompanying drawings:

[0023] As Figure 1 , the head structure for high-temperature treatment of porous medium is arranged at the lower part of the fluidized reactor and includes a head shell 4, the head shell 4 is provided with a head jacket 11 around the periphery, the head jacket 11 is injected with a temperature control medium, the lower part of the head jacket 11 is provided with a medium inlet 7, the upper part of the head jacket 11 is provided with a medium outlet 3, the medium inlet 7 and the medium outlet 3 are both connected with a medium heating device, the lower part of the head shell 4 is communicated with a fluidized gas inlet pipe 10, the top of the head shell 4 is communicated with the upper fluidized section 1 of the fluidized reactor through a gas distribution plate 2, the gas distribution plate 2 is provided with a discharge port one 13, and the bottom of the head shell 4 is provided with a discharge port two 5.

[0024] In this embodiment:

[0025] The fluidization gas inlet pipe 10 is connected with the guide pipe 8, the guide pipe 8 is arranged inside the head shell 4, and the guide pipe 8 is directed to the obliquely lower part of the inner cavity of the head shell 4. The guide pipe 8 plays a guiding role on the flow direction of the fluidization gas. In use, the fluidization gas is injected from the fluidization gas inlet pipe 10 into the lower part of the head shell 4 through the guide pipe 8, and then the fluidization gas flows from the lower part of the head shell 4 to the upper part of the head shell 4, and then flows to the fluidization section 1 through the gas distribution plate 2. The guide pipe 8 makes the fluidization gas enter the lower part of the head shell 4, increases the flow time and the temperature rising time of the fluidization gas in the head shell 4, and improves the temperature rising effect of the fluidization gas.

[0026] The fluidization gas inlet pipe 10 is provided with an adjusting valve 9, and the adjusting valve 9 controls the flow of the fluidization gas. In use, the fluidization gas can be injected into the head shell 4 at a constant flow rate through the adjusting valve 9.

[0027] The discharge port one 13 is provided with a discharge valve one 12. In use, when the high-temperature treatment of the porous medium by the fluidized reactor is completed, the discharge valve one 12 is opened, and the porous medium after the high-temperature treatment flows from the fluidization section 1 into the head shell 4.

[0028] The discharge port two 5 is provided with a discharge valve two 6. When the high-temperature treatment of the porous medium by the fluidized reactor is completed, the discharge valve two 6 is opened after the porous medium after the high-temperature treatment flows into the head shell 4, and the porous medium after the high-temperature treatment in the head shell 4 is discharged to an external collecting device.

[0029] The temperature control medium is heat conducting oil, and the heat conducting oil has good heat stability and heat transfer effect.

[0030] The temperature of the head jacket 11 is controlled at 50-350℃. The temperature of the temperature control medium is raised to 50-350℃ by a medium temperature raising device, the temperature control medium after the temperature rising is injected into the head jacket 11 to raise the temperature of the head jacket 11, so that the temperature of the head jacket 11 is controlled at 50-350℃ by controlling the temperature of the temperature control medium.

[0031] The cross section of the head shell 4 is circular, and the lower part of the head shell 4 is in a neck-in shape. The lower part of the head shell 4 in the neck-in shape has a vertical surface on one side and an inclined surface on the other side. When the high-temperature treatment of the porous medium by the fluidized reactor is completed, the porous medium after the reaction flows into the head shell 4 and is discharged to an external collecting device through the discharge port two 5. The vertical surface and the inclined surface of the lower part of the head shell 4 in the neck-in shape are beneficial to the flow of the porous medium to the discharge port two 5 under the action of gravity, and reduce the residual amount of the porous medium in the head shell 4.

[0032] The vertical surface of the head shell 4 and the inclined surface of the head shell 4 form an angle of 30-60°.

[0033] The guide pipe 8 and the lower part of the vertical surface of the head shell 4 form an angle of 45°.

[0034] Specific working process, the temperature of the fluidized section 1 of the fluidized reactor is set to 400℃, the temperature control medium heat conducting oil is heated to 300℃ under the action of the external medium heating device, the heat conducting oil enters the head jacket 11 from the medium inlet 7, and then returns to the external medium heating device for circulating heating use. After the temperature control medium heat conducting oil circulates into the head jacket 11 for heating for 15 minutes, the regulating valve 9 is opened, the fluidizing gas enters the head shell 4 through the fluidizing gas inlet pipe 10 and the flow guide pipe 8 at a constant flow rate, the fluidizing gas exchanges heat with the temperature control medium heat conducting oil in the head jacket 11 in the head shell 4, the temperature control medium heat conducting oil after cooling is discharged to the external medium heating device through the medium outlet 3 for heating and circulating use, and the fluidizing gas after heating is homogenized by the gas distribution plate 2 and then enters the fluidized section 1, fully contacts with the porous medium in the fluidized section 1, the porous medium in the fluidized section 1 reaches the fluidized state under the action of the fluidizing gas, thereby completing the high temperature treatment of the porous medium, then the discharge valve one 12 is opened, the porous medium after high temperature treatment enters the head shell 4 from the fluidized section 1, then the discharge valve two 6 is opened, the porous medium after high temperature treatment in the head shell 4 is discharged to the external collecting device.

Claims

1. A head for high temperature treatment of a porous medium, arranged in the lower part of a fluidized reactor, characterized in that: The device comprises a head shell (4), the head shell (4) is provided with a head jacket (11) on the periphery, the head jacket (11) is filled with temperature control medium, the lower part of the head jacket (11) is provided with a medium inlet (7), the upper part of the head jacket (11) is provided with a medium outlet (3), the medium inlet (7) and the medium outlet (3) are both connected with a medium temperature rising device, the lower part of the head shell (4) is connected with a fluidization gas inlet pipe (10), the top of the head shell (4) is connected with the upper fluidization section (1) of a fluidization reactor through a gas distribution plate (2), the gas distribution plate (2) is provided with a first discharge port (13), the bottom of the head shell (4) is provided with a second discharge port (5); The fluidization gas inlet pipe (10) is connected with a guide pipe (8), the guide pipe (8) is arranged in the head shell (4), and the guide pipe (8) is directed to the obliquely lower part of the inner cavity of the head shell (4); The fluidization gas inlet pipe (10) is provided with an adjusting valve (9); The first discharge port (13) is provided with a first discharge valve (12); The second discharge port (5) is provided with a second discharge valve (6); The temperature control medium is heat conducting oil; The temperature of the head jacket (11) is controlled at 50-350 DEG C; The cross section of the head shell (4) is circular, and the lower part of the head shell (4) is in the shape of a neck, the lower part of the head shell (4) in the shape of a neck is provided with a vertical surface on one side and a slant surface on the other side; The vertical surface of the head shell (4) and the slant surface of the head shell (4) form an angle of 30-60 DEG; The guide pipe (8) and the lower part of the vertical surface of the head shell (4) form an angle of 45 DEG.

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