A solid-phase material feeding and melting device and method

Abstract

The present invention discloses a solid-phase material feeding and melting device and method. The device comprises a silo (BK-01), a solid pipeline (L-1), a rotary feed valve (XV-02), a molten buffer tank (V-03), a liquid phase circulation pipeline (L-2), a superheater (E-05) and a raw material tank (V-06); the outlet of the silo (BK-01) is downwardly connected to the inlet of the molten buffer tank (V-03) through the solid pipeline (L-1), and a liquid-solid mixer (M-08) is arranged on the solid pipeline (L-1); the molten buffer tank (V-03) is provided with the liquid phase circulation pipeline (L-2), and the liquid phase circulation pipeline (L-2) is provided with the superheater (E-05); the liquid phase circulation pipeline (L-2) also includes a branch (L-3) connected to the raw material tank (V-06).

Description

Technical Field

[0001] The invention belongs to the process industry field of solid material processing, in particular to the field of solid material transportation and pressure boosting in petrochemical and chemical industries, and specifically refers to a solid-phase material feeding and melting device and method. Background Art

[0002] Traditionally, in chemical production, many raw materials and semi-finished products are in a solid state and need to be transported from one place to another. In addition, there are strict requirements for the flow rate of fixed raw materials, and the operating conditions need to meet certain temperature and pressure conditions. That is, solid materials, as raw materials in the process chemical industry, will have too many troubles compared with liquid materials. In addition to the high labor intensity of loading and unloading of solid materials, the large storage area, and the high failure rate of conveying machinery; the large-scale process equipment and the large flow of process materials bring great challenges to the equipment and the labor intensity of workers. In particular, when materials enter the device, they need to control the unit conveying volume, heat the materials, and pressurize the materials. These three problems that need to be solved are not simple tasks that can be completed by a single device for solid materials. Therefore, in industrial production, a method of feeding and melting solid materials with high efficiency, small footprint, and low investment is needed. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present invention provides a solid-phase material feeding and melting device and method.

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

[0005] In one aspect, the present invention provides a solid-phase material feeding and melting device, which includes a silo, a solid pipeline, a rotary feed valve, a melting buffer tank, a liquid-phase circulation pipeline, a superheater and a raw material tank;

[0006] The outlet of the silo is downwardly connected to the inlet of the molten buffer tank through the solid pipeline, and a liquid-solid mixer is provided on the solid pipeline;

[0007] The molten buffer tank is provided with the liquid phase circulation pipeline, and the superheater is provided on the liquid phase circulation pipeline; the liquid phase circulation pipeline also includes a branch line connected to the raw material tank.

[0008] The outlet of the silo is downwardly connected to the inlet of the molten buffer tank through the solid pipeline, that is, the silo and the molten buffer tank are installed in upper and lower positions, and it should be ensured that the solid solid material in the pipeline can overcome the friction force and fall down under the force of gravity; it is best to install them concentrically and vertically.

[0009] The specific operation method of the solid-phase material feeding and melting device includes: the solid material loaded in the silo is fed into the melting buffer tank through the rotary feed valve for melting, and circulated through the liquid phase circulation pipeline. The superheater superheats the circulating liquid, and the solid phase is completely melted and carries a certain amount of sensible heat by controlling the superheater outlet temperature; the superheated liquid is sent to the solid pipeline and has the dual functions of suction and mixing with the solid material from the silo and the rotary feed valve. The mixed solid and liquid undergo heat transfer, so that the solid begins to melt and enters the scale basket of the melting buffer tank at the same time. The large pieces of solid that cannot be melted will be further eroded, broken and melted in the scale basket and then flow into the buffer tank. A certain amount of tiny particles of solid are also sent to the superheater through the liquid phase circulation pipeline to heat up to the required temperature. Most of them are circulated, and a small amount is sent to the raw material tank to maintain the temperature and sent to the downstream reaction system.

[0010] The rotary feed valve can be variable speed, which can control the flow rate of solid material flow feed to be stable and realize adjustable and controllable flow rate. In addition, the device of the present invention uses a simple rotary feed valve to replace the accurate metering loss-in-weight feeder in the prior art, thereby reducing the installation height of the silo.

[0011] The superheater can ensure that the solid material is completely melted and superheated to the required temperature downstream, reducing the volume of the melting buffer tank and the installation height of the silo, and at the same time can also achieve an increase in the scale of solid feed melting, and at the same time can also enable the molten material carrying sufficient sensible heat to completely melt the solid material after mixing. The present invention changes the heating mode of the melting buffer tank jacket and the inner coil to a circulation heat extraction mainly based on the heat exchange of the external superheater, so that the scale of solid feed and melting processing is no longer limited by the heat exchange area of ​​the melting buffer tank; and the size of the melting buffer tank is reduced.

[0012] According to the solid-phase material feeding and melting device of the present invention, preferably, the liquid-phase circulation pipeline includes a circulation pump and a liquid-solid mixer; the outlet of the melting buffer tank is connected to the solid pipeline through the circulation pump, and the liquid-solid mixer is arranged at the connecting point; the superheater is arranged on the pipeline between the circulation pump and the liquid-solid mixer; a branch is arranged on the liquid-phase circulation pipeline between the superheater and the liquid-solid mixer, which is connected to the raw material tank.

[0013] The liquid phase circulation pipeline can achieve the dual functions of drainage and mixing of solid materials, thereby achieving early and rapid melting of the solid materials.

[0014] The flow rate of the circulation pump should include the flow rate required for the melting of the fluid medium, and should also include the flow rate of the medium sent out after melting, because the corresponding circulation ratio is guaranteed to reduce the proportion of solid content, so that the circulation pump can be selected from general centrifugal pumps.

[0015] The present invention adds a liquid-solid mixer, utilizes liquid to erode, crush and mix and melt solid materials, increases sensible heat exchange, and selects a large circulation volume circulation pump, thereby eliminating the original stirring equipment in the prior art and reducing the solid content at the inlet of the circulation pump as a whole, so that a general centrifugal pump can be selected. In addition, a gas phase circulation line is set to match the drainage function of the mixer.

[0016] According to the solid-phase material feeding and melting device of the present invention, preferably, a pressure balance line is arranged between the melting buffer tank and the top of the silo; in order to prevent the gas phase in the melting buffer tank from blocking the gravity flow of the solid material, a gas phase circulation line is arranged between the melting buffer tank and the pipeline between the liquid-solid mixer and the rotary feed valve, and the pressure balance line and the gas phase circulation line realize pressure balance and gas phase circulation between the top of the silo and the melting buffer tank.

[0017] According to the solid-phase material feeding and melting device of the present invention, preferably, a solid gate valve is provided on the solid pipeline to prevent the solid material from flowing out by gravity during shutdown; the solid gate valve is provided on the solid pipeline between the silo and the rotary feed valve.

[0018] According to the solid-phase material feeding and melting device of the present invention, preferably, the melting buffer tank is a steam jacketed tank.

[0019] More preferably, a heating coil is provided in the melting buffer tank to ensure that the solid material initially loaded can be melted in the melting buffer tank, thereby realizing the circulation of the solid melting medium.

[0020] According to the solid-phase material feeding and melting device of the present invention, preferably, a scale basket is provided in the melting buffer tank for removing impurities and isolating large pieces of solid material, and its main function is to allow the liquid-phase material to erode, crush and melt the solid particles under allowable resistance conditions.

[0021] According to the solid-phase material feeding and melting device of the present invention, preferably, the outlet of the raw material tank is provided with a raw material pump for delivering the molten material in the raw material tank into a downstream reaction system.

[0022] Those skilled in the art will appreciate that the solid-phase material feeding and melting device of the present invention also includes necessary instrument components and control systems such as temperature, flow, liquid level and control valves to jointly complete the melting and pressure delivery functions of the solid material and together constitute a complete set of equipment.

[0023] In order to reduce the installation height of the silo, the device of the present invention adopts a simple rotary valve instead of an accurate weight-loss feeder. The size of the melting buffer tank is reduced, and the heating mode of the melting buffer tank jacket and inner coil is changed to a circulation heat extraction mainly using an external superheater for heat exchange, so that the scale of solid feeding and melting processing is no longer limited by the heat exchange area of ​​the melting buffer tank. At the same time, by adding a liquid-solid mixer, the solid material is eroded, crushed and mixed and melted by liquid, while the sensible heat exchange is increased and a large circulation volume circulation pump is selected, thereby eliminating the original stirring equipment as a whole and reducing the solid content at the inlet of the circulation pump, so that a general centrifugal pump can be selected. In addition, a gas phase circulation line is set to match the drainage function of the liquid-solid mixer.

[0024] Another aspect of the present invention provides a method for feeding and melting a solid-phase material, wherein the method is performed using the above-mentioned solid-phase material feeding and melting device.

[0025] According to the solid-phase material feeding and melting method of the present invention, preferably, the method comprises the following steps:

[0026] The solid material loaded in the silo is sent to the melting buffer tank through the rotary feed valve for melting, and the melted material enters the liquid phase circulation pipeline. The superheater superheats the circulating material and ensures that the solid phase is completely melted and carries a certain amount of sensible heat by controlling the superheater outlet temperature; part of the superheated material is sent to the solid pipeline and mixed with the solid material from the silo and then circulated into the melting buffer tank, and part of it is sent to the raw material tank through the branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0028] Figure 1 Schematic diagram of a solid flow feeding and melting device in an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] BK-01 Silo

[0031] HV Solid Gate Valve

[0032] XV-02 Rotary Feed Valve

[0033] M-08 Liquid-Solid Mixer

[0034] V-03 Melt Buffer Tank

[0035] P-04 Circulation Pump

[0036] E-05 Superheater

[0037] V-06 Raw material tank

[0038] P-07 Raw material pump

[0039] L-1 Solid pipeline

[0040] L-2 Liquid circulation pipeline

[0041] L-3 bypass

[0042] L-4 Pressure balance line

[0043] L-5 Gas circulation line

[0044] 301 Heating Coil DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0046] In addition, some directional words mentioned in the embodiments of the present invention, such as "left", "right", etc., have meanings related to the drawing of the device diagram and should not be understood as limiting the scope of protection of the present invention.

[0047] For the specific adipic acid to adiponitrile project, the stable demand for adipic acid in the adiponitrile process unit is 9.62t / h, the single series adipic acid feed is 4810kg / h, the liquid adipic acid fed into the raw material tank has an operating temperature of 170℃, and the operating pressure fed into the downstream equipment is 0.5MPa. Figure 1 ) The principles and features of the present invention are described, and the examples given are only used to explain specific cases of the present invention, and the solid material is not limited to the melting and feeding of adipic acid solid material.

[0048] like Figure 1 As shown, this embodiment provides a specific melting and feeding device for adipic acid solid material, including a silo BK-01, a solid pipeline L-1, a rotary feed valve XV-02, a melt buffer tank V-03, a liquid phase circulation pipeline L-2, a superheater E-05 and a raw material tank V-06.

[0049] The outlet of the silo BK-01 is downwardly connected to the inlet of the molten buffer tank V-03 through the solid pipeline L-1, and a liquid-solid mixer M-08 is provided on the solid pipeline L-1;

[0050] The molten buffer tank V-03 is provided with the liquid phase circulation pipeline L-2, and the superheater E-05 is provided on the liquid phase circulation pipeline L-2; the liquid phase circulation pipeline L-2 also includes a branch L-3, which is connected to the raw material tank V-06.

[0051] The specific operation method of the solid-phase material feeding and melting device includes: the solid material loaded in the silo BK-01 is fed into the melting buffer tank V-03 for melting through the rotary feed valve XV-02, and circulated through the liquid phase circulation pipeline L-2. The superheater E-05 superheats the circulating liquid, and the outlet temperature of the superheater E-05 is controlled to ensure that the solid phase is completely melted and carries a certain amount of sensible heat; the superheated liquid is sent to the solid pipeline L-1 and has the dual functions of suction and mixing with the solid material from the silo BK-01 and the rotary feed valve XV-02. The mixed solid and liquid undergo heat transfer, causing the solid to begin to melt and enter the scale basket of the melting buffer tank V-03 at the same time. The large pieces of solid adipic acid that cannot be melted will be further eroded, crushed and melted in the scale basket and then flow into the buffer tank. A certain amount of tiny solid particles are sent to superheater E-05 through liquid phase circulation pipeline L-2 to heat up to the required temperature. Most of them are circulated, and a small amount is sent to raw material tank V-06 to maintain the temperature and sent to the downstream reaction system.

[0052] The rotary feed valve XV-02 is variable speed, which can control the flow rate of solid material flow feed to be stable and realize adjustable and controllable flow rate. In addition, the device of the present invention adopts a simple rotary feed valve XV-02 to replace the accurate metering loss-in-weight feeder FS-02 in the prior art, thereby reducing the installation height of the silo BK-01.

[0053] The superheater E-05 can ensure that the solid material is completely melted and superheated to the required temperature of the downstream, reduce the volume of the melting buffer tank V-03 and the installation height of the silo BK-01, and at the same time, increase the scale of solid feed melting, and at the same time, enable the molten material carrying sufficient sensible heat to completely melt the solid material after mixing. The present invention changes the heating mode of the melting buffer tank jacket and the inner coil to a circulation heat extraction mainly based on the heat exchange of the external superheater, so that the scale of solid feed and melting processing is no longer limited by the heat exchange area of ​​the melting buffer tank V-03; and the size of the melting buffer tank V-03 is reduced.

[0054] Specifically, the liquid phase circulation pipeline L-2 includes a circulation pump P-04 and a liquid-solid mixer M-08; the outlet of the molten buffer tank V-03 is connected to the solid pipeline through the circulation pump P-04, and the liquid-solid mixer M-08 is provided at the connection point; the superheater E-05 is provided on the pipeline between the circulation pump P-04 and the liquid-solid mixer M-08; a branch is provided on the liquid phase circulation pipeline between the superheater E-05 and the liquid-solid mixer M-08, which is connected to the raw material tank V-06.

[0055] The liquid phase circulation pipeline L-2 can achieve the dual functions of drainage and mixing of solid materials, thereby achieving early and rapid melting of the solid materials.

[0056] The flow rate of the circulating pump P-04 should include the flow rate required for the melting of the fluid medium, and should also include the flow rate of the medium delivered after melting, because the corresponding circulation ratio is guaranteed to reduce the proportion of solid content, so that a general centrifugal pump can be selected for the circulating pump.

[0057] The present invention adds a liquid-solid mixer M-08, utilizes liquid to erode, crush and mix and melt solid materials, increases sensible heat exchange, and selects a large circulation volume circulation pump P-04, thereby eliminating the original stirring equipment in the prior art and reducing the solid content at the inlet of the circulation pump as a whole, so that a general centrifugal pump can be selected. In addition, in order to match the drainage function of the mixer, a pressure balance line L-4 and a gas phase circulation line L-5 are set.

[0058] Specifically, the pressure balance line L-4 is arranged between the melt buffer tank V-03 and the top of the silo BK-01, so that the gas phase pressure at the top of the silo BK-01 and in the melt buffer tank V-03 is basically equal; at the same time, in conjunction with the drainage effect of the liquid flow of the liquid-solid mixer M-08 on the solid adipic acid, a gas phase circulation line L-5 is arranged, and the gas phase circulation line L-5 connects the melt buffer tank V-03 and the pipeline between the liquid-solid mixer M-08 and the rotary feed valve XV-02 to avoid the gas phase in the melt buffer tank V-03 blocking the gravity flow of the solid material, and pressure balance and gas phase circulation are achieved through the pressure balance line L-4 and the gas phase circulation line L-5.

[0059] The solid pipeline is provided with a solid gate valve HV, which is used to prevent the solid material from flowing out by gravity when the work is stopped. Specifically, the solid gate valve HV is provided on the solid pipeline between the silo BK-01 and the rotary feed valve XV-02.

[0060] Specifically, the melting buffer tank V-03 is a steam jacketed tank, and a heating coil 301 is arranged inside to ensure that the solid material initially loaded can be melted in the melting buffer tank V-03, thereby realizing the circulation of the solid melting medium.

[0061] The molten buffer tank V-03 is provided with a scale basket for removing impurities and isolating large pieces of solid materials. Its main function is to allow the liquid phase material to erode, crush and melt the solid particles under the allowable resistance conditions.

[0062] The outlet of the raw material tank V-06 is provided with a raw material pump P-07 for delivering the molten material in the raw material tank V-06 to the downstream reaction system.

[0063] Those skilled in the art will appreciate that the solid-phase material feeding and melting device of the present invention also includes necessary instrument components and control systems such as temperature, flow, liquid level and control valves to jointly complete the melting and pressure delivery functions of the solid material and together constitute a complete set of equipment.

[0064] When the device is used to melt and transport solid adipic acid, the process is as follows:

[0065] First, solid adipic acid is fed into the silo BK-01 (outer dimensions ID3m×11mT / T) by conventional means. A conical discharge port is set at the bottom of the silo BK-01. The solid pipeline L-1 connects the outlet of the silo BK-01 and the rotary feed valve XV-02. A solid gate valve HV is set on the pipeline to cut off the solid feed. The rotary feed valve XV-02 is set with a large frequency conversion adjustment range to adapt to the better flow adjustment range and the influence of solid adhesion on the rotary valve. The solid material then enters the melting buffer tank V-03 (outer dimensions ID3m×1.5mT / T). A heating coil 301 of about 10 square meters is set at the bottom of the melting buffer tank V-03 to melt the adipic acid solid and dissipate heat. Since the initial start-up can be exchanged for efficiency through time, the specific calculation data will not be repeated here. According to the restrictions of adipic acid decomposition temperature, the heat exchange target temperature of superheater E-05 is determined to be 170℃. In order to increase the heat exchange temperature difference of molten adipic acid, the solid adipic acid heating and complete melting are selected from the sensible heat of liquid adipic acid. Considering the increase of heat exchange temperature difference and melting rate of cold and hot adipic acid, the temperature of adipic acid after mixing is selected to be 160℃ to ensure sufficient heat exchange area of ​​superheater. The heat exchange of molten buffer tank V-03 is ignored, and the heat exchange area of ​​superheater E-05 is calculated to be 49 square meters, and the circulation volume of liquid adipic acid is about 99t / h. Considering the pressure demand of liquid-solid mixer M-08, the head of circulation pump P-04 is selected to be 35m. In order to ensure the stability of operation and the requirements of residence time, adipic acid raw material tank V-06 and raw material pump P-07 are retained. Considering that the gas in the melting buffer tank V-03 blocks the gravity flow of solid materials, a pressure balance line L-4 is set to make the gas phase pressure at the top of the silo BK-01 and in the melting buffer tank V-03 basically equal. At the same time, in conjunction with the drainage effect of the liquid flow of the liquid-solid mixer M-08 on the solid adipic acid, a gas phase circulation line L-5 is set. In addition, the adipic acid feeding and melting device also needs to be equipped with certain temperature, pressure, material level, flow rate and other control instruments (such as Figure 1 The dashed lines in the middle are all signal lines connected to various control instruments, which include but are not limited to flow monitoring, liquid level detection control regulating valve, flow detection control regulating valve, etc.), to ensure continuous and stable operation of the device.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A solid material feeding and melting device, It is characterized in that The device includes a silo (BK-01), a solid pipeline (L-1), a rotary feed valve (XV-02), a molten buffer tank (V-03), a liquid phase circulation pipeline (L-2), a superheater (E-05) and a raw material tank (V-06); The outlet of the silo (BK-01) is downwardly connected to the inlet of the molten buffer tank (V-03) through the solid pipeline, and a liquid-solid mixer (M-08) is provided on the solid pipeline (L-1); The molten buffer tank (V-03) is provided with the liquid phase circulation pipeline (L-2), and the superheater (E-05) is provided on the liquid phase circulation pipeline (L-2); the liquid phase circulation pipeline (L-2) also includes a branch (L-3) connected to the raw material tank (V-06); The liquid phase circulation pipeline (L-2) includes a circulation pump (P-04) and a liquid-solid mixer (M-08); the outlet of the molten buffer tank (V-03) is connected to the solid pipeline (L-1) through the circulation pump (P-04), and the liquid-solid mixer (M-08) is provided at the connection point; the superheater (E-05) is provided on the pipeline between the circulation pump (P-04) and the liquid-solid mixer (M-08); a branch (L-3) is provided on the liquid phase circulation pipeline (L-2) between the superheater (E-05) and the liquid-solid mixer (M-08), and is connected to the raw material tank (V-06); A pressure balance line (L-4) is provided between the molten buffer tank (V-03) and the top of the silo (BK-01).

2. The solid phase material feeding and melting device according to claim 1, It is characterized in that The pipelines between the molten buffer tank (V-03) and the liquid-solid mixer (M-08) and the rotary feed valve (XV-02) are all provided with a gas phase circulation line (L-5).

3. The solid phase material feeding and melting device according to claim 1, It is characterized in that The solid pipeline (L-1) is provided with a solid gate valve (HV); The solid gate valve (HV) is arranged on the solid pipeline (L-1) between the silo (BK-01) and the rotary feed valve (XV-02).

4. The solid phase material feeding and melting device according to claim 1, It is characterized in that The molten buffer tank (V-03) is a steam jacketed tank.

5. The solid phase material feeding and melting device according to claim 4, It is characterized in that A heating coil (301) is arranged in the molten buffer tank (V-03).

6. The solid phase material feeding and melting device according to claim 5, It is characterized in that A scale basket is provided in the molten buffer tank (V-03).

7. The solid phase material feeding and melting device according to claim 1, It is characterized in that The outlet of the raw material tank (V-06) is provided with a raw material pump (P-07).

8. A method for feeding and melting solid materials, It is characterized in that The method is carried out using the solid-phase material feeding and melting device described in any one of claims 1 to 7.

9. The solid phase material feeding and melting method according to claim 8, It is characterized in that The method comprises the following steps: The solid material loaded in the silo (BK-01) is fed into the melting buffer tank (V-03) through the rotary feed valve (XV-02) for melting, and the melted material enters the liquid phase circulation pipeline (L-2). The superheater (E-05) superheats the circulating material, and controls the outlet temperature of the superheater (E-05) to ensure that the solid phase is completely melted and carries a certain amount of sensible heat; part of the superheated material is sent to the solid pipeline (L-1) to mix with the solid material from the silo (BK-01) and then circulate into the melting buffer tank (V-03), and part of it is sent to the raw material tank (V-06) through the branch (L-3).

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