CN113304692A

CN113304692A - Solid-phase material feeding and melting device and method

Info

Publication number: CN113304692A
Application number: CN202110685109.3A
Authority: CN
Inventors: 李奎; 闫安; 孙晓彤; 郭天祥; 刘汉英; 石岩峻; 徐庆生; 马达国; 曹坚
Original assignee: Beijing Petrochemical Engineering Co Ltd
Current assignee: Beijing Petrochemical Engineering Co Ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2021-08-27

Abstract

The invention discloses a solid-phase material feeding and melting device and a method. The device comprises a storage bin (BK-01), a solid pipeline (L-1), a rotary feed valve (XV-02), a melting buffer tank (V-03), a liquid phase circulation pipeline (L-2), a superheater (E-05) and a raw material tank (V-06); an outlet of the stock bin (BK-01) is downwards communicated with an inlet of the melting 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 melting buffer tank (V-03) is provided with the liquid phase circulation pipeline (L-2), and the superheater (E-05) is arranged on the liquid phase circulation pipeline (L-2); the liquid phase circulation line (L-2) further comprises a branch (L-3) which is communicated with the raw material tank (V-06).

Description

Solid-phase material feeding and melting device and method

Technical Field

The invention belongs to the field of solid material processing flow industry, in particular to the field of solid material conveying and pressure boosting in petrochemical and chemical industries, and particularly relates to a solid material feeding and melting device and a solid material feeding and melting method.

Background

Traditionally, in chemical production many raw materials and semi-finished products are in a solid state, which needs to be transported from one place to another, and have strict requirements on the flow rate as a fixed raw material, and certain temperature and pressure conditions need to be achieved in terms of operating conditions. That is, solid materials are used as raw materials in the process chemical industry, and compared with liquid materials, the solid materials have much trouble, and the solid materials have the advantages of high loading and unloading labor intensity, large storage land occupation and high failure rate of conveying machinery; the large scale of the process device and the large flow of the process materials bring great test to the labor intensity of equipment and workers. Especially, the material entering device needs unit conveying capacity control, material temperature rise and material pressure rise, and the three problems to be solved are not simple tasks which can be completed by a single device for solid materials. Therefore, a solid material feeding and melting mode with high efficiency, small occupied area and less investment is needed in industrial production.

Disclosure of Invention

In order to solve at least one technical problem, the invention provides a solid-phase material feeding and melting device and a solid-phase material feeding and melting method.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a solid-phase material feeding and melting device, which comprises a storage bin, a solid pipeline, a rotary feeding valve, a melting buffer tank, a liquid-phase circulating pipeline, a superheater and a raw material tank, wherein the storage bin is used for storing solid-phase materials;

an outlet of the bin is communicated with an inlet of the melting buffer tank downwards through the solid pipeline, and a liquid-solid mixer is arranged on the solid pipeline;

the melting buffer tank is provided with the liquid phase circulating pipeline, and the superheater is arranged on the liquid phase circulating pipeline; the liquid phase circulation pipeline also comprises a branch which is communicated with the raw material tank.

The outlet of the bin is communicated with the inlet of the melting buffer tank through the solid pipeline, namely the bin and the melting buffer tank are arranged in an upper position and a lower position, so that the solid material can fall in the pipeline under the action of gravity and overcome the friction force; preferably concentrically and vertically mounted.

The concrete operation method of the solid-phase material feeding and melting device comprises the following steps: solid materials loaded in the bin are sent to a melting buffer tank through a rotary feeding valve to be melted, and are circulated through a liquid phase circulation pipeline, a circulating liquid is superheated by a superheater, and the solid phase is ensured to be completely melted and carry certain sensible heat by controlling the temperature of an outlet of the superheater; the superheated liquid is sent to the solid pipeline and has the double functions of pumping and mixing with the solid materials from the feed bin and the rotary feed valve, the mixed solid and liquid are subjected to heat transfer, so that the solid starts to melt and simultaneously enters the scaling basket of the melting buffer tank, and large solid blocks which are not melted can be further eroded and crushed in the scaling basket and flow into the buffer tank after being melted. And a certain amount of solid with tiny particles is sent to the superheater through a liquid phase circulation pipeline to be heated to the required temperature, most of the solid is circulated, and a small amount of the solid is sent to the raw material tank to maintain the temperature and is sent to a downstream reaction system.

The rotary feeding valve can change speed, can control the flow stability of solid material flow feeding and realize the adjustment and the control of the flow. In addition, the device adopts a simple rotary feeding valve to replace a weightless feeder with accurate metering in the prior art, thereby realizing the reduction of the installation height of the storage bin.

The superheater 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 and the installation height of the storage bin, and simultaneously can also realize the increase of the melting scale of solid feeding, and simultaneously can also ensure that the solid material can be completely melted after being mixed by the melting material carrying enough sensible heat. The invention changes the heating mode of the melting buffer tank jacket and the inner coil pipe into the circulating heat taking mainly by the heat exchange of the external superheater, so that the scale of solid feeding and melting treatment is not limited by the heat exchange area of the melting buffer tank any more; the size of the melting buffer tank is reduced.

According to the solid-phase material feeding and melting device of the present invention, preferably, the liquid-phase circulation line includes a circulation pump and a liquid-solid mixer; the outlet of the melting buffer tank is connected to the solid pipeline through the circulating pump, and the liquid-solid mixer is arranged at the communication position; the superheater is arranged on a pipeline between the circulating pump and the liquid-solid mixer; and a branch is arranged on a liquid phase circulating pipeline between the superheater and the liquid-solid mixer and is communicated with the raw material tank.

The liquid phase circulation pipeline can achieve dual functions of drainage and mixing of solid materials, and accordingly early and rapid melting of the solid materials is achieved.

The flow rate of the circulating pump comprises the flow rate required by melting of the fluid medium, and the flow rate of the melted medium, and the proportion of the solid content is reduced because the corresponding circulation ratio is ensured, so that the circulating pump can be a common centrifugal pump.

The invention utilizes liquid to carry out erosion crushing and mixing melting on solid materials by adding the liquid-solid mixer, simultaneously increases sensible heat exchange, and selects the circulating pump with large circulating capacity, thereby integrally eliminating the original stirring equipment in the prior art and reducing the solid content at the inlet of the circulating pump, thereby selecting a common centrifugal pump, and additionally, arranging a gas phase circulating line for the drainage function of the matched mixer.

According to the solid-phase material feeding and melting device, a pressure balance line is preferably arranged between the melting buffer tank and the top of the storage bin; in order to avoid the gravity flow of gas phase retardation solid materials in the melting buffer tank, a gas phase circulation line is arranged between the melting buffer tank and a pipeline between the liquid-solid mixer and the rotary feed valve, and the pressure balance line and the gas phase circulation line realize the pressure balance and the gas phase circulation between the top of the storage bin and the melting buffer tank.

According to the solid material feeding and melting device, a solid gate valve is preferably arranged on the solid pipeline and used for preventing the solid material from flowing out by gravity when the solid pipeline is stopped; the solid gate valve is arranged on a solid pipeline between the storage bin and the rotary feeding valve.

According to the solid-phase material feeding and melting device, the melting buffer tank is preferably a steam jacketed tank.

More preferably, a heat tracing coil is arranged in the melting buffer tank, so that solid materials charged for the first time can be melted in the melting buffer tank, and circulation of a solid melting medium is realized.

According to the solid material feeding and melting device, a fouling basket is preferably arranged in the melting buffer tank and used for removing impurities and isolating massive solid materials, and the main function is to enable liquid materials to erode, break and melt solid particles under the allowable resistance condition.

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 feeding the molten material in the raw material tank to the downstream reaction system.

As understood by those skilled in the art, the solid material feeding and melting device of the present invention further comprises necessary instrument elements and control systems such as temperature, flow, liquid level and control valves, so as to jointly perform the melting and pressure delivering functions of the solid material, and jointly form a complete set of devices.

The device of the invention adopts a simple rotary material valve to replace a weightless feeder with accurate measurement in order to reduce the installation height of the storage bin. The size of the melting buffer tank is reduced, the heating mode of a melting buffer tank jacket and an inner coil is changed into the circulation heating mode mainly based on the heat exchange of an external superheater, and thus the solid feeding and melting processing scale is not limited by the heat exchange area of the melting buffer tank any more. Simultaneously through increasing liquid solid blender, utilize liquid to carry out the erosion breakage and mix the melting to solid material, increase the sensible heat transfer simultaneously, select the circulating pump of big circulation volume to realize cancelling original agitated vessel on the whole, reduce the solid content of circulating pump entry, thereby can choose for use general centrifugal pump, in addition, for the drainage effect of supporting liquid solid blender, set up the gas phase circulation line.

In another aspect, the present invention provides a method for feeding and melting a solid material, which is performed by using the above solid material feeding and melting apparatus.

The solid phase material feeding and melting method according to the present invention preferably comprises the steps of:

solid materials loaded in the feed bin are fed into the melting buffer tank through the rotary feed valve to be melted, the melted materials enter the liquid phase circulation pipeline, the circulating materials are overheated by the superheater, and the solid phase is guaranteed to be completely melted and carry certain sensible heat by controlling the temperature of the outlet of the superheater; and part of the superheated material is sent to a solid pipeline to be mixed with the solid material from the bin and then circularly enters the melting buffer tank, and part of the superheated material is sent to the raw material tank through the branch.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

FIG. 1 is a schematic view of a solid stream feed and melting apparatus in an embodiment of the present invention.

Description of reference numerals:

BK-01 stock bin

HV solid gate valve

XV-02 rotary feed valve

M-08 liquid-solid mixer

V-03 melting buffer tank

P-04 circulating pump

E-05 superheater

V-06 head tank

P-07 raw material pump

L-1 solid line

L-2 liquid phase circulation line

Branch of L-3

L-4 pressure balance line

L-5 gas phase circulation line

301 heat tracing coil pipe

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

In addition, some directional terms, such as "left", "right", etc., mentioned in the embodiments of the present invention, should be used in the device drawings, and should not be construed as limiting the scope of the present invention.

Aiming at a project of preparing adiponitrile from specific adipic acid, the stable demand of an adiponitrile process unit on the adipic acid is 9.62t/h, the feeding amount of a single series of adipic acid is 4810kg/h, the operating temperature of liquid adipic acid fed into a raw material tank is 170 ℃, and the operating pressure of liquid adipic acid fed into downstream equipment is 0.5 MPa. The principles and features of the present invention are described below in connection with adipic acid feed and melting (detailed fig. 1), the examples given are merely illustrative of specific embodiments of the invention, and the solid material is not limited to the melting and feeding of adipic acid solid material.

As shown in FIG. 1, the present example provides a specific adipic acid solid material melting and feeding apparatus, which comprises a stock bin BK-01, a solid pipeline L-1, a rotary feed valve XV-02, a melting buffer tank V-03, a liquid phase circulation pipeline L-2, a superheater E-05 and a raw material tank V-06.

An outlet of the stock bin BK-01 is downwards communicated with an inlet of the melting 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 melting buffer tank V-03 is provided with the liquid phase circulation pipeline L-2, and the superheater E-05 is arranged on the liquid phase circulation pipeline L-2; the liquid phase circulation pipeline L-2 also comprises a branch L-3 which is communicated with the raw material tank V-06.

The concrete operation method of the solid-phase material feeding and melting device comprises the following steps: solid materials loaded in a stock bin BK-01 are sent to a melting buffer tank V-03 through a rotary feed valve XV-02 to be melted, and are circulated through a liquid phase circulation pipeline L-2, a superheater E-05 superheats the circulated liquid, and the solid phase is ensured to be completely melted and carry certain sensible heat by controlling the outlet temperature of the superheater E-05; the superheated liquid is sent to a solid pipeline L-1 and has the double functions of pumping and mixing with solid materials from a stock bin BK-01 and a rotary feed valve XV-02, the mixed solid and liquid are subjected to heat transfer, so that the solid starts to melt and simultaneously enters a scale depositing basket of a melting buffer tank V-03, and large solid adipic acid which cannot be melted can be further eroded and broken in the scale depositing basket and flows into the buffer tank after being melted. And a certain amount of solid with tiny particles is sent to the superheater E-05 through a liquid phase circulation pipeline L-2 to be heated to the required temperature, most of the solid is circulated, and a small amount of the solid is sent to the raw material tank V-06 to maintain the temperature and is sent to a downstream reaction system.

The rotary feed valve XV-02 can change speed, can control the flow stability of solid material flow feeding and realize the adjustment and control of the flow. In addition, the device adopts the simple rotary feed valve XV-02 to replace a weightless feeder FS-02 with accurate metering in the prior art, thereby realizing the reduction of the installation height of the stock bin BK-01.

The superheater E-05 can ensure that the solid material is completely melted and superheated to the required temperature at the downstream, reduce the volume of the melting buffer tank V-03 and the installation height of the bunker BK-01, simultaneously realize the increase of the melting scale of solid feeding, and simultaneously ensure that the solid material can be completely melted after being mixed by the melting material carrying enough sensible heat. The invention changes the heating mode of the melting buffer tank jacket and the inner coil pipe into the circulating heat taking mainly by the heat exchange of the external superheater, so that the scale of solid feeding and melting treatment is not limited by the heat exchange area of the melting buffer tank V-03 any more; the size of the melting buffer tank V-03 is reduced.

Specifically, the liquid phase circulation pipeline L-2 comprises a circulation pump P-04 and a liquid-solid mixer M-08; the outlet of the melting buffer tank V-03 is communicated to the solid pipeline through the circulating pump P-04, and the liquid-solid mixer M-08 is arranged at the communication position; the superheater E-05 is arranged on a pipeline between the circulating pump P-04 and the liquid-solid mixer M-08; a branch is arranged on a liquid phase circulating pipeline between the superheater E-05 and the liquid-solid mixer M-08 and is communicated with the raw material tank V-06.

The liquid phase circulation pipeline L-2 can realize the dual functions of drainage and mixing of solid materials, thereby realizing the early and rapid melting of the solid materials.

The flow rate of the circulating pump P-04 comprises the flow rate required by melting of the fluid medium, and the flow rate of the melted medium, and the proportion of the solid content is reduced because the corresponding circulation ratio is ensured, so that the circulating pump can be selected from a common centrifugal pump.

The invention adopts the liquid-solid mixer M-08 to erode, crush, mix and melt solid materials by liquid, simultaneously increases sensible heat exchange, and selects the circulating pump P-04 with large circulation capacity, thereby integrally eliminating the original stirring equipment in the prior art and reducing the solid content at the inlet of the circulating pump, so that a common centrifugal pump can be selected, and in addition, a pressure balance line L-4 and a gas phase circulation line L-5 are arranged for the drainage function of the matched mixer.

Specifically, a pressure balance line L-4 is arranged between the melting buffer tank V-03 and the top of the stock bin BK-01, so that the gas phase pressure in the top of the stock bin BK-01 and the gas phase pressure in the melting buffer tank V-03 are basically equal; meanwhile, a gas phase circulation line L-5 is arranged by matching with the drainage effect of liquid material flow of the liquid-solid mixer M-08 on solid adipic acid, the gas phase circulation line L-5 is connected with a pipeline between the melting buffer tank V-03 and the liquid-solid mixer M-08 and the rotary feed valve XV-02 so as to prevent gas phase in the melting buffer tank V-03 from blocking the gravity flow of solid materials, and pressure balance and gas phase circulation are realized through a pressure balance line L-4 and the gas phase circulation line L-5.

And the solid pipeline is provided with a solid gate valve HV for preventing the gravity outflow of solid materials when the solid pipeline is stopped. Specifically, the solid gate valve HV is arranged on the solid line between the silo BK-01 and the rotary feed valve XV-02.

Specifically, the melting buffer tank V-03 is a steam jacketed tank, and a heat tracing coil pipe 301 is arranged in the melting buffer tank V-03, so that solid materials loaded for the first time can be melted in the melting buffer tank V-03, and circulation of solid melting media is realized.

A scale depositing basket is arranged in the melting buffer tank V-03 and is used for removing impurities and isolating massive solid materials, and the main function of the melting buffer tank V-03 is to enable liquid-phase materials to erode, crush and melt solid particles under the allowable resistance condition.

And a raw material pump P-07 is arranged at the outlet of the raw material tank V-06 and is used for conveying the molten material in the raw material tank V-06 to a downstream reaction system.

Specifically, when the device is used for melting and conveying solid adipic acid, the process is as follows:

firstly, solid adipic acid is fed into a stock bin BK-01 (external dimension ID3m X11 mT/T) by a conventional method, a conical discharge port is arranged at the bottom of the stock bin BK-01, a solid pipeline L-1 is connected with an outlet of the stock bin BK-01 and a rotary feeding valve XV-02, and a solid gate valve HV is arranged on the pipeline for cutting off solid feeding. The rotary feed valve XV-02 is provided with a large variable frequency regulation range for adapting to the influence of a good flow regulation range, solid adhesion and the like on the rotary feed valve. The solid material enters a melting buffer tank V-03 (the shape dimension is ID3m multiplied by 1.5mT/T), about 10 horizontal heat tracing coil pipes 301 are arranged at the bottom in the melting buffer tank V-03 and used for melting adipic acid solid and dissipating heat, the efficiency can be changed through time during the first start-up, and specific calculation data are not repeated here. According to the limits of adipic acid decomposition temperature and the like, the heat exchange target temperature of the superheater E-05 is determined to be 170 ℃, in order to increase the heat exchange temperature difference of molten adipic acid, sensible heat of solid adipic acid from liquid adipic acid is selected for temperature rise and complete melting, the heat exchange temperature difference and the melting rate of cold and hot adipic acid are considered to be increased, the temperature of mixed adipic acid is 160 ℃, the sufficient superheater heat exchange area is ensured, the heat exchange amount of the melting buffer tank V-03 is ignored, and therefore the calculated heat exchange area of the superheater E-05 is 49 degrees, and the circulation amount of liquid-phase adipic acid is about 99 t/h. The head of the circulating pump P-04 is selected to be 35M in consideration of the pressure requirement of the liquid-solid mixer M-08, and the adipic acid feed tank V-06 and the feed pump P-07 are reserved for ensuring the stability of the operation and the residence time requirement. Considering that gas in the melting buffer tank V-03 retards the gravity flow of the solid material, a pressure balance line L-4 is arranged to ensure that the gas phase pressure in the top of the stock bin BK-01 is basically equal to that in the melting buffer tank V-03, and a gas phase circulation line L-5 is arranged in cooperation with the drainage effect of the liquid material flow of the liquid-solid mixer M-08 on the solid adipic acid. In addition, the adipic acid feeding and melting device needs to be matched with certain control instruments such as temperature, pressure, material level and flow (as shown in fig. 1, dotted lines are signal lines connected with the control instruments, and the control instruments include but are not limited to flow monitoring, a liquid level detection control regulating valve, a flow detection control regulating valve and the like), so as to ensure continuous and stable operation of the device.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims

1. A solid-phase material feeding and melting device is characterized by comprising a stock bin (BK-01), a solid pipeline (L-1), a rotary feeding valve (XV-02), a melting buffer tank (V-03), a liquid-phase circulating pipeline (L-2), a superheater (E-05) and a raw material tank (V-06);

an outlet of the stock bin (BK-01) is downwards communicated with an inlet of the melting buffer tank (V-03) through the solid pipeline, and a liquid-solid mixer (M-08) is arranged on the solid pipeline (L-1);

the melting buffer tank (V-03) is provided with the liquid phase circulation pipeline (L-2), and the superheater (E-05) is arranged on the liquid phase circulation pipeline (L-2); the liquid phase circulation line (L-2) further comprises a branch (L-3) which is communicated with the raw material tank (V-06).

2. The solid-phase material feeding and melting apparatus according to claim 1, wherein the liquid-phase circulation line (L-2) comprises a circulation pump (P-04) and a liquid-solid mixer (M-08); the outlet of the melting buffer tank (V-03) is communicated to the solid pipeline (L-1) through the circulating pump (P-04), and the liquid-solid mixer (M-08) is arranged at the communication position; the superheater (E-05) is arranged on a pipeline between the circulating pump (P-04) and the liquid-solid mixer (M-08); a branch (L-3) is arranged on a liquid phase circulation pipeline (L-2) between the superheater (E-05) and the liquid-solid mixer (M-08) and is communicated with the raw material tank (V-06).

3. The solid material feeding and melting apparatus according to claim 1, wherein a pressure equalization line (L-4) is provided between the melting buffer tank (V-03) and the top of the silo (BK-01);

and a gas phase circulation line (L-5) is arranged between the melting buffer tank (V-03) and a pipeline between the liquid-solid mixer (M-08) and the rotary feed valve (XV-02).

4. The solid material feeding and melting device according to claim 1, characterized in that a solid gate valve (HV) is provided on the solid line (L-1);

the solid gate valve (HV) is arranged on the solid line (L-1) between the silo (BK-01) and the rotary feed valve (XV-02).

5. The solid material feeding and melting apparatus according to claim 1, wherein the melting buffer tank (V-03) is a steam jacketed tank.

6. The solid material feeding and melting apparatus according to claim 5, wherein a heat tracing coil (301) is provided in the melting buffer tank (V-03).

7. The solid material feeding and melting apparatus according to claim 6, wherein a fouling basket is provided in the melting buffer tank (V-03).

8. The solid material feeding and melting apparatus according to claim 1, wherein the outlet of the raw material tank (V-06) is provided with a raw material pump (P-07).

9. A method for feeding and melting a solid material, which is carried out by using the apparatus for feeding and melting a solid material according to any one of claims 1 to 8.

10. The solid phase material feeding and melting method of claim 9, wherein the method comprises the steps of:

solid materials filled in the stock bin (BK-01) are sent into the melting buffer tank (V-03) through the rotary feed valve (XV-02) to be melted, the melted materials enter the liquid phase circulation pipeline (L-2), the superheater (E-05) superheats the circulated materials, and the outlet temperature of the superheater (E-05) is controlled to ensure that the solid phase is completely melted and carries certain sensible heat; the superheated material is partly sent to a solid pipeline (L-1) to be mixed with the solid material from the stock bin (BK-01) and then is circulated into the melting buffer tank (V-03), and partly sent to the raw material tank (V-06) through the branch (L-3).