CN111906085B - Reducing carbonization tower - Google Patents
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- CN111906085B CN111906085B CN202010598374.3A CN202010598374A CN111906085B CN 111906085 B CN111906085 B CN 111906085B CN 202010598374 A CN202010598374 A CN 202010598374A CN 111906085 B CN111906085 B CN 111906085B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention provides a reducing carbonization tower, wherein a middle section air inlet device is arranged at the middle section of a tower body, the outlet ends of the middle section air inlet devices are inclined upwards and all face to the same clockwise direction, so that the middle section air inlet is in an annular vortex, the impact of the middle section air inlet device and the upward airflow of the lower spiral is greatly reduced, and the pressure distribution in the tower tends to be stable. By adjusting the middle section air inlet speed, the change of the distribution of the flow field in the tower along with the change of the middle section air inlet speed under the same tower diameter is obtained, and the optimization reference is provided for industrial operation.
Description
Technical Field
The invention relates to a carbonization tower, in particular to a variable-diameter carbonization tower.
Background
In the alkali preparation process of the carbonization tower, a layer of thick NaHco3 scab is gradually formed on the small cooling pipe, the tower wall and the water tank, and the gas-liquid channel and the residence time of the carbonization liquid are influenced. After the soda production period is finished, the tower needs to be cleaned instead to recover the soda production and cooling capacity of the carbonization tower. The cleaning strength of the carbonization tower is related to the concentration of CO2, the cleaning gas amount and the like. NaHCO3 scabs are mainly concentrated in the cooling section, and after cleaning gas enters the tower bottom, CO2 is quickly absorbed and enters the sieve plate layer, the volume is reduced by about 40%, the gas jet and liquid turbulence intensity of the sieve holes are insufficient, the liquid level of the tower ring is high, the liquid leakage phenomenon is increased, and the cleaning effect is poor. Therefore, the sieve tray tower requires a stronger cleaning strength in the same cleaning cycle.
In addition, the middle section air inlet device of the existing carbonization tower has the defects of uneven air inlet, large impact of air on the heat exchange tube in the water tank during air inlet, easy local deformation of the heat exchange tube and the like, and great influence on the cleaning efficiency.
Disclosure of Invention
The invention provides a reducing carbonization tower aiming at the defects of the prior art, and aims to solve the problems.
In order to achieve the purpose, the invention provides the following technical scheme: the reducing carbonization tower comprises a reducing carbonization tower,
the tower body is positioned in the middle section;
the middle section air inlet device is arranged coaxially with the tower body and comprises a circular ring-shaped pipe, a plurality of air outlets uniformly distributed along the circumferential direction of the circular ring-shaped pipe are formed in the circular ring-shaped pipe, the circular ring-shaped pipe is composed of a plurality of sections of arc pipes, two ends of each arc pipe are sealed, an air inlet is formed in the middle of each arc pipe radially outwards, two air outlets are formed in the arc pipes radially inwards, and the two air outlets are symmetrically arranged on two sides of the air inlet;
the jet flow pipe is a right-angle bent pipe and is fixedly arranged on the tower body, the jet flow pipe is connected with the gas outlet through a flow dividing pipe, one end of the jet flow pipe is fixedly connected with the flow dividing pipe, the other end of the jet flow pipe is an outlet end, the outlet end is arranged in an upward inclined mode and faces towards the same clockwise direction, and the inclination angle alpha is 10 degrees;
and the pressurizing nozzle is arranged at the outlet end.
On the basis of the above scheme, preferably, the arc-shaped pipe has three sections.
On the basis of the scheme, the shunt pipe is preferably fixedly connected with the air inlet through a flange plate.
On the basis of the scheme, as preferred, the booster nozzle includes the body, the inner tube, the nozzle lid, the nozzle core, the inner tube is located the body, inner tube one end fixed connection nozzle lid, other end fixed connection nozzle core, nozzle lid and body fixed connection, body, inner tube, nozzle lid, nozzle core surround the inlet channel who forms the cavity and communicate this cavity with the inlet end of nozzle core, be provided with in the cavity and divide into the baffle in two spaces with its airtight, be provided with the spring between nozzle lid and the baffle.
On the basis of the scheme, the inner pipe is a stepped pipe, the pipe body is a straight pipe, the nozzle cover is an annular plate, the inner annular edge of the nozzle cover is provided with a flange, the flange is fixedly connected with the upper end of the inner pipe through threads, and the outer annular edge of the nozzle cover is fixedly connected with the pipe body through bolts.
On the basis of above-mentioned scheme, as preferred, the inner tube includes pipe A, pipe B, pipe A's diameter is less than pipe B's diameter, pipe A's lower extreme fixed connection pipe B forms the ladder pipe, the nozzle core includes pipe C, pipe D, pipe C's lower extreme is provided with the ring limit, pipe C's outer wall and pipe B's inner wall screw thread fixed connection, ring limit fixed connection pipe D's upper end, form the inlet channel with the cavity intercommunication between ring limit and pipe D's the inner wall, inlet channel's the end of giving vent to anger is equipped with a plurality of interval distribution's U-shaped board.
A method for optimizing the cleaning effect of a cleaning tower of a variable-diameter carbonization tower comprises the following steps:
1. establishing a physical model of the variable-diameter carbonization tower: simplifying a physical model of the variable-diameter carbonization tower according to the structure and the equipment size of the variable-diameter carbonization tower and parts influenced by a flow field inside the variable-diameter carbonization tower, and completing modeling by utilizing soildworks;
2. determining a solution domain and dividing a grid file of the calculation domain, introducing the established physical model of the variable-diameter carbonization tower into ICEM CFD software and determining a simulation calculation domain, wherein the simulation solution domain determines a closed fluid domain with a CO2 middle-section air inlet, a CO2 outlet and the outer surface of the tower body as boundaries; dividing a closed fluid domain of the fluid by adopting a structural grid; naming the boundary part, exporting a grid file, and entering solution;
3. and (3) solving:
1) in the process, fluent software is selected for solving, after the stored grid file is imported into fluent software, firstly, the grid file is checked for the first step to ensure that no negative volume exists, and the size proportion is modified to ensure that the grid is consistent with the unit scale in the calculation domain;
2) selecting a mathematical model and setting an initial condition, namely a standard k-epsilon turbulence model;
3) determining a material property CO 2;
4) the setting of boundary conditions is carried out, the technical scheme adopts porous media to replace the flowing of gas out of the sieve plate, and the viscous resistance coefficient is as follows: the resistance coefficients of other directions except the main direction are 1000 times of the main direction coefficient; coefficient of inertial resistance: except the main direction, the inertia coefficients of other directions are 1000 times of the main direction coefficient; selecting a Laminar flow model Laminar Zone because the porous medium area has Laminar flow characteristics; the resistance coefficient is calculated for the pressure drop and speed experiment data by adopting a resistance coefficient calculation method. Setting import and export boundary conditions Intensity and Hydraulic Diameter;
5) setting solving calculation control parameters according to the actual conditions of the diameter-variable carbonization tower, setting a solving format, a discrete format and a convergence condition, and activating a monitor;
6) initializing a flow field and completing iterative solution calculation to obtain the required basic physical quantity in the variable-diameter carbonization tower;
7) and post-processing, namely displaying the solving result in a cloud picture or scattered point form, so that the flow field distribution condition in the carbonization tower can be conveniently and clearly known.
Compared with the prior art, the invention has the beneficial effects that:
1. the outlet ends of the middle section air inlet devices are inclined upwards and all face to the same clockwise direction, so that the middle section air inlet is in an annular vortex, the impact of the middle section air inlet device and the upward airflow of the spiral below is greatly reduced, and the pressure distribution in the tower tends to be stable;
2. the middle section air inlet device has uniform air inlet distribution, and is convenient for operating the middle section air inlet amount;
3. the middle section air inlet device enables the middle section air inlet to be in an annular vortex, and greatly reduces impact abrasion to the tube bundle in the heat exchange water tank.
4. The outlet end of the middle section air inlet device is provided with the pressurizing nozzle, so that the pressure of cleaning air entering the tower is increased, and the cleaning effect is improved.
5. The conventional simulation scheme is a scheme for establishing a close example and simplifying a model according to the real tower internal situation so as to enable the simulation result to be more accurate. The scheme of the invention is that the condition of uneven air inlet distribution of the existing device is changed, so that the existing air inlet distribution is even and close to idealization, and the simulation result is more accurate;
6. according to the simulation scheme, as shown in fig. 6 and 7, the change of the flow field distribution in the tower along with the change of the middle section air inlet speed under the same tower diameter is obtained by adjusting the middle section air inlet speed, so that the optimization reference is provided for the industrial operation;
7. the simulation scheme of the invention overcomes the defects of large investment, long period and the like of engineering tests.
8. Fig. 6 (2) is a cloud of pressure distributions at an intake velocity 2 times that of fig. 1, and it can be seen from fig. 6 that as the purge gas increases, the pressure in the column increases and the pressure distribution in the column becomes more uniform. The pressure change fluctuation in the tower is small, which is beneficial to cleaning the carbon scar by the cleaning gas and improves the cleaning efficiency. Fig. 7 (2) is a cloud of pressure distributions at an intake velocity 2 times higher than that of fig. 1 (1), and from fig. 7 we can see that as the purge gas increases, the velocity in the middle of the column increases. The speed is increased, so that the turbulence intensity of liquid is increased, the liquid level of the tower ring is lower, the liquid leakage phenomenon is reduced, and the cleaning effect is good.
Drawings
FIG. 1 is a schematic structural view of a middle stage air intake apparatus according to the present invention;
FIG. 2 is a cross-sectional view of a nozzle of the present invention;
FIG. 3 is a three-dimensional view of a nozzle connecting shaft of the present invention;
FIG. 4 is a three-dimensional view of a nozzle core of the present invention;
FIG. 5 is a three-dimensional physical model diagram of a variable diameter carbonization tower of the present invention;
FIG. 6 is a cloud of pressure distributions under the exemplary embodiment of the present invention;
FIG. 7 is a cloud of velocity profiles under the conditions of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention, and in this context, detachable fixation means that the components can be detached without destroying their original performance.
As shown in fig. 1, the variable diameter carbonization tower, comprises,
the tower body 1 is positioned in the middle section;
the middle section air inlet device is arranged coaxially with the tower body and comprises a circular ring-shaped pipe, a plurality of air outlets 4 uniformly distributed along the circumferential direction of the circular ring-shaped pipe are formed in the circular ring-shaped pipe, the circular ring-shaped pipe is composed of a plurality of sections of arc pipes 2, two ends of each arc pipe are sealed, an air inlet 3 is formed in the middle of each arc pipe radially outwards, two air outlets are formed in each arc pipe radially inwards, and the two air outlets are symmetrically arranged on two sides of the air inlet;
the jet flow pipe 5 is a right-angle bent pipe, the jet flow pipe is fixedly arranged on the tower body, the jet flow pipe is connected with the air outlet through a flow dividing pipe 6, one end of the jet flow pipe is fixedly connected with the flow dividing pipe, the other end of the jet flow pipe is an outlet end, the outlet end is arranged in an upward inclined mode and faces the same clockwise direction, and the inclination angle alpha is 10 degrees;
and the pressurizing nozzle is arranged at the outlet end.
In the scheme, the plurality of shunt tubes are uniformly arranged on the circular ring-shaped tube, so that the air inflow in unit time is increased, the uniformity of gas distribution in the carbonization tower is improved, and the air inflow efficiency of the carbonization tower is improved; be provided with the jet-propelled pipe on the shunt tubes, the jet-propelled pipe adopts the right angle return bend to its exit end tilt up sets up, makes the combustion gas form the annular vortex, disperses in all directions, compares in the mode that many shunt tubes of conventionality directly admitted air, and its mode of admitting air is more reasonable, can avoid the impact wear to the tube bank in the heat exchange water tank, has improved the life of equipment.
The arc tube has three sections.
The shunt pipe is fixedly connected with the air inlet through a flange plate.
The booster nozzle comprises a pipe body 7, an inner pipe 8, a nozzle cover 9 and a nozzle core 10, wherein the inner pipe is positioned in the pipe body, one end of the inner pipe is fixedly connected with the nozzle cover, the other end of the inner pipe is fixedly connected with the nozzle core, the nozzle cover is fixedly connected with the pipe body, the inner pipe, the nozzle cover and the nozzle core surround to form a cavity and an air inlet channel communicated with the air inlet end of the cavity 11 and the nozzle core, a baffle 12 for dividing the cavity into two spaces in an airtight mode is arranged in the cavity, and a spring 13 is arranged between the nozzle cover and the baffle.
The gas passes through the jet pipe and can be divided into two branches, the gas of one branch enters the tower from the nozzle core, and the gas of the other branch enters the pressurizing cavity from the gas inlet channel. The gas entering the pressurizing cavity can slowly press the baffle and the spring, the gas of the branch can return due to the closed pressurizing cavity, and the returned gas can also be pushed by the spring, so that the gas outlet pressure of the nozzle is improved by the method, and the cleaning effect is improved.
The inner tube is the ladder pipe, and the body is the straight tube, and the nozzle lid is the annular plate, and the inner ring limit of nozzle lid is provided with flange 14, flange and inner tube upper end screw thread fixed connection, and the outer ring limit of nozzle lid passes through bolt fixed connection with the body.
The inner tube includes pipe A15, pipe B16, pipe A's diameter is less than pipe B's diameter, pipe A's lower extreme fixed connection pipe B forms the ladder pipe, the nozzle core includes pipe C17, pipe D18, pipe C's lower extreme is provided with ring limit 19, pipe C's outer wall and pipe B's inner wall screw thread fixed connection, ring limit fixed connection pipe D's upper end, form the inlet channel 21 with the cavity intercommunication between ring limit and pipe D's the inner wall, inlet channel's the end of giving vent to anger is equipped with a plurality of interval distribution's U-shaped board 20.
Through the design of the U-shaped plate, the direction of the airflow at the air outlet end of the air inlet channel is changed, one direction is vertically upward along the air inlet channel, and the other direction is vertically blocked by the U-shaped plate and enters air into the cavity from two sides of the U-shaped plate; the two different air inlet directions make the supercharging effect of the supercharging cavity more obvious.
A method for optimizing the cleaning effect of a cleaning tower of a variable-diameter carbonization tower comprises the following steps:
1. establishing a physical model of the variable-diameter carbonization tower: simplifying a physical model of the variable-diameter carbonization tower according to the structure and the equipment size of the variable-diameter carbonization tower and parts influenced by a flow field inside the variable-diameter carbonization tower, and completing modeling by utilizing soildworks;
2. determining a solution domain and dividing a grid file of the calculation domain, introducing the established physical model of the variable-diameter carbonization tower into ICEM CFD software and determining a simulation calculation domain, wherein the simulation solution domain determines a closed fluid domain with a CO2 middle-section air inlet, a CO2 outlet and the outer surface of the tower body as boundaries; dividing a closed fluid domain of the fluid by adopting a structural grid; naming the boundary part, exporting a grid file, and entering solution;
3. and (3) solving:
1) in the process, fluent software is selected for solving, after the stored grid file is imported into fluent software, firstly, the grid file is checked for the first step to ensure that no negative volume exists, and the size proportion is modified to ensure that the grid is consistent with the unit scale in the calculation domain;
2) selecting a mathematical model and setting an initial condition, namely a standard k-epsilon turbulence model;
3) determining a material property CO 2;
4) the setting of boundary conditions is carried out, the technical scheme adopts porous media to replace the flowing of gas out of the sieve plate, and the viscous resistance coefficient is as follows: the resistance coefficients of other directions except the main direction are 1000 times of the main direction coefficient; coefficient of inertial resistance: except the main direction, the inertia coefficients of other directions are 1000 times of the main direction coefficient; selecting a Laminar flow model Laminar Zone because the porous medium area has Laminar flow characteristics; the resistance coefficient is calculated for the pressure drop and speed experiment data by adopting a resistance coefficient calculation method. Setting import and export boundary conditions Intensity and Hydraulic Diameter;
5) setting solving calculation control parameters according to the actual conditions of the diameter-variable carbonization tower, setting a solving format, a discrete format and a convergence condition, and activating a monitor;
6) initializing a flow field and completing iterative solution calculation to obtain the required basic physical quantity in the variable-diameter carbonization tower;
7) and post-processing, wherein the solved result is mainly displayed in a cloud picture or scattered point form, so that the flow field distribution condition in the desulfurizing tower can be conveniently and clearly known.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (3)
1. The variable-diameter carbonization tower is characterized by comprising,
the tower body is positioned in the middle section;
the middle section air inlet device is arranged coaxially with the tower body and comprises a circular ring-shaped pipe, a plurality of air outlets are uniformly distributed along the circumferential direction of the circular ring-shaped pipe, the circular ring-shaped pipe is composed of a plurality of sections of arc pipes, two ends of each arc pipe are sealed, an air inlet is arranged radially outwards in the middle of each arc pipe, two air outlets are arranged radially inwards in each arc pipe, and the two air outlets are symmetrically arranged on two sides of the air inlet;
the jet flow pipe is a right-angle bent pipe and is fixedly arranged on the tower body, the jet flow pipe is connected with the gas outlet through a flow dividing pipe, one end of the jet flow pipe is fixedly connected with the flow dividing pipe, the other end of the jet flow pipe is an outlet end, the outlet end is arranged in an upward inclined mode and faces towards the same clockwise direction, and the inclination angle alpha is 10 degrees;
the pressurizing nozzle is arranged at the outlet end;
the pressurizing nozzle comprises a pipe body, an inner pipe, a nozzle cover and a nozzle core, wherein the inner pipe is positioned in the pipe body, one end of the inner pipe is fixedly connected with the nozzle cover, the other end of the inner pipe is fixedly connected with the nozzle core, the nozzle cover is fixedly connected with the pipe body, the inner pipe, the nozzle cover and the nozzle core surround to form a cavity and an air inlet channel for communicating the cavity with the air inlet end of the nozzle core, a baffle plate for dividing the cavity into two spaces in an airtight manner is arranged in the cavity, a spring is arranged between the nozzle cover and the baffle plate,
the inner pipe is a stepped pipe, the pipe body is a straight pipe, the nozzle cover is an annular plate, the inner ring edge of the nozzle cover is provided with a flange which is fixedly connected with the upper end of the inner pipe through threads, the outer ring edge of the nozzle cover is fixedly connected with the pipe body through bolts,
the inner tube includes pipe A, pipe B, and pipe A's diameter is less than pipe B's diameter, and pipe A's lower extreme fixed connection pipe B forms the ladder pipe, and the nozzle core includes pipe C, pipe D, and pipe C's lower extreme is provided with the ring limit, and pipe C's outer wall and pipe B's inner wall screw thread fixed connection, ring limit fixed connection pipe D's upper end, form the inlet channel who communicates with the cavity between ring limit and pipe D's the inner wall, inlet channel's the end of giving vent to anger is equipped with a plurality of interval distribution's U-shaped board.
2. The variable diameter carbonization tower of claim 1, wherein the arc tube has three segments.
3. The variable diameter carbonization tower of claim 1, wherein the dividing tube is fixedly connected with the gas outlet by a flange.
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Application publication date: 20201110 Assignee: Jiangsu Kesheng Chemical Machinery Co., Ltd Assignor: Huaiyin Institute of Technology Contract record no.: X2021980011908 Denomination of invention: Variable diameter carbonization tower Granted publication date: 20210817 License type: Common License Record date: 20211105 |