CN113941218B - Adsorption tower flue gas leakage prevention control system, method and device - Google Patents
Adsorption tower flue gas leakage prevention control system, method and device Download PDFInfo
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- CN113941218B CN113941218B CN202010681198.XA CN202010681198A CN113941218B CN 113941218 B CN113941218 B CN 113941218B CN 202010681198 A CN202010681198 A CN 202010681198A CN 113941218 B CN113941218 B CN 113941218B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40001—Methods relating to additional, e.g. intermediate, treatment of process gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40003—Methods relating to valve switching
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Abstract
The application provides an adsorption tower flue gas leakage prevention control system, a method and a device, wherein the system comprises an adsorption tower and a control end, a discharge chute is arranged at the bottom of the adsorption tower, two discharge round rollers are arranged at the opening of the discharge chute, the bottom of the discharge chute is connected with a discharge rotary valve, and a high material level switch and a low material level switch are arranged on the side surface of the discharge chute; wherein, the control end can execute the following steps: starting a discharging round roller of the adsorption tower to start discharging; judging whether a low material level switch has a material level signal or not; if yes, delaying a first preset time to enable the material level of the discharging chute to be located at the middle position of the high material level switch and the low material level switch, starting the discharging rotary valve, and enabling the discharging speed of the discharging rotary valve to be consistent with the discharging speed of the corresponding discharging round roller; if not, increasing the discharging speed of the discharging round roller, and after delaying the second preset time, judging whether a low material level switch of the discharging chute has a material level signal or not. By adopting the scheme, the material sealing can be realized by utilizing the active carbon materials in the discharging chute, and the smoke leakage is prevented.
Description
Technical Field
The application relates to the technical field of flue gas purification, in particular to a flue gas leakage prevention control system, method and device for an adsorption tower.
Background
For industrial flue gas, especially sintered flue gas generated by a sintering machine in the steel industry, a desulfurization and denitrification system comprising an active carbon adsorption tower and a desorption tower is an ideal scheme for purifying the flue gas. In the desulfurization and denitrification system, an activated carbon adsorption tower is used for adsorbing pollutants including sulfur oxides, nitrogen oxides and dioxin from sintering flue gas or exhaust gas, and a desorption tower is used for regenerating the activated carbon adsorbed with the pollutants by high Wen Jiexi.
Fig. 1 shows an activated carbon desulfurization and denitrification system comprising: the device comprises an adsorption tower 1 and a desorption tower 2, wherein the lower part of the side surface of the adsorption tower 1 is connected with a booster fan 3, the bottom of the adsorption tower 1 is provided with a discharging round roller 101, and a discharging rotary valve 102 is arranged below the discharging round roller 101; an active carbon vibrating screen 4 is arranged below the analysis tower 2. The process for purifying sintering flue gas by using the system comprises the following steps: the dust-removed raw sintering flue gas is sent to an adsorption tower 1 after being pressurized by a booster fan 3, sulfur oxides in the sintering flue gas are adsorbed by active carbon in the adsorption tower 1 and are catalytically oxidized into sulfuric acid, meanwhile, nitrogen oxides and ammonia for denitration react in the adsorption tower 1 to generate ammonium nitrate salt, the nitrogen oxides and the ammonia react to generate denitration reaction, nitrogen and water are produced, sulfuric acid and ammonium nitrate salt generated by the reaction are adsorbed by the active carbon, purified flue gas is discharged through an exhaust port on the adsorption tower 1, and the adsorbed saturated active carbon is discharged into a hopper of a first active carbon conveyor G1 through a discharge round roller 101 and a discharge rotary valve 102 and then is conveyed to an analysis tower 2 through the first active carbon conveyor G1. The activated carbon with saturated adsorption enters the analysis tower 2, the high-temperature gas in the analysis tower 2 carries out indirect heating analysis on the activated carbon with saturated adsorption, the activated carbon after heating analysis passes through the activated carbon vibrating screen 4 below the analysis tower 2, coarse-particle activated carbon is screened out and discharged onto the second activated carbon conveyor G2, and the coarse-particle activated carbon is input into the adsorption tower 1 again for recycling through the second activated carbon conveyor G2.
In the above process, after the sintering flue gas enters the adsorption tower, most of the flue gas is purified after passing through the activated carbon bed layer and is discharged from the adsorption tower 1, but a small part of the flue gas may leak from the discharge rotary valve, and the sintering flue gas contains SO 2 、NO X Substances such as water vapor and the like are easy to corrode metal equipment, the discharging rotary valve can be worn and corroded slowly in the operation process, and the clearance between the valve core and the shell is gradually increased, so that the amount of sintered smoke leaked into the activated carbon conveyor is increased, the chain and metal parts of the activated carbon conveyor are corroded, the service life of the chain of the activated carbon conveyor is greatly shortened for a long time, and a pipeline of a dust removal system is blocked and corroded. Therefore, how to prevent the leakage of flue gas from the adsorption tower is a problem to be solved.
Disclosure of Invention
The application provides an adsorption tower smoke leakage prevention control system, method and device, and aims to solve the problem that in the prior art, adsorption tower smoke is easy to leak from a discharging rotary valve.
In a first aspect, an embodiment of the present application provides an adsorption tower flue gas leakage prevention control system, including: the adsorption tower and the control end;
the bottom of the adsorption tower is provided with V-shaped discharge chute, at least two discharge round rollers are arranged at the opening of each discharge chute, the bottom of each discharge chute is connected with a discharge rotary valve, the side surface of each discharge chute is provided with a high material level switch and a low material level switch, the high material level switch is close to the upper part of the discharge chute, and the low material level switch is close to the bottom of the discharge chute;
the control terminal is configured to perform the steps of:
starting a discharging round roller of the adsorption tower to start discharging;
judging whether a low material level switch of the discharging chute has a material level signal or not;
if yes, delaying a first preset time to enable the material level of the discharging chute to be located at the middle position of the high material level switch and the low material level switch;
starting the discharging rotary valve to enable the discharging speed of the discharging rotary valve to be consistent with the discharging speed of the corresponding discharging round roller;
if not, increasing the discharging speed of the discharging round roller, and after delaying the second preset time, judging whether a low material level switch of the discharging chute has a material level signal or not.
With reference to the first aspect, in one implementation manner, the control end is further configured to:
judging whether the material level of the discharging chute is higher than a high material level switch or not;
if yes, increasing the discharging speed of the discharging rotary valve, and after delaying the third preset time, judging whether the material level of the discharging chute is higher than a high material level switch;
if not, controlling the discharging rotary valve to keep the current discharging speed to run.
With reference to the first aspect, in one implementation manner, the control of the discharging speed of the discharging rotary valve may be controlled by using a variable frequency motor drive or by using a common motor drive;
when the variable frequency motor drive control is adopted, the control end adjusts the discharging speed of the discharging rotary valve by controlling the motor speed;
when the common motor driving control is adopted, the control end sets a time threshold value, and the discharging rotary valve is intermittently started within the time threshold value so as to control the discharging speed of the discharging rotary valve.
With reference to the first aspect, in one implementation manner, when the variable frequency motor is used to control the discharging speed of the discharging rotary valve, the discharging speed of the discharging rotary valve is obtained according to the following method:
wherein: w (W) j When the variable frequency motor is controlled, the discharging speed of the discharging rotary valve is t/h; v is the impeller volume of the rotary valve, m 3 R; n is the rotating speed of the rotary valve, r/min; η is the filling rate of the impeller and takes a value of 75-80%; ρ is the density of the activated carbon, t/m 3 。
With reference to the first aspect, in one implementation manner, when a common motor is used to control the discharging speed of the discharging rotary valve, the discharging speed of the discharging rotary valve is obtained according to the following method:
wherein W is 1 When the motor is controlled by a common motor, the discharging speed of the discharging rotary valve is t/h; n is n 1 The rotating speed of the common motor is r/min; w (W) 2 When the motor is controlled by a common motor, the discharging speed of the discharging rotary valve within a preset time threshold value is t/h; t is a preset time threshold value, T 1 And within a preset time threshold, the common motor is started for a time.
With reference to the first aspect, in one implementation manner, the first preset time is obtained according to the following method:
t1 is a first preset time, unit: s; v is the volume of the charge level in the intermediate position of the high and low charge level switches that needs to be increased relative to the low charge level switch, unit: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρ is the density of the activated carbon, t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the W1 is the discharging speed of the discharging round roller, and the unit is: t/h.
With reference to the first aspect, in one implementation manner, the initial discharging speed of the discharging round roller is determined according to the discharging speed of the adsorption tower.
In a second aspect, the embodiment of the present application provides a control method for preventing leakage of flue gas from an adsorption tower, where the control method is applied to the control system in any one of the first aspects, and the control method includes:
starting a discharging round roller of the adsorption tower to start discharging;
judging whether a low material level switch of the discharging chute has a material level signal or not;
if yes, delaying a first preset time to enable the material level of the discharging chute to be located at the middle position of the high material level switch and the low material level switch;
starting a discharging rotary valve, so that the discharging speed of the discharging rotary valve is consistent with the discharging speed of the corresponding discharging round roller;
if not, increasing the discharging speed of the discharging round roller, and after delaying the second preset time, judging whether the low level switch of the discharging chute has a level signal or not.
With reference to the second aspect, in one implementation manner, the control method further includes:
judging whether the material level of the discharging chute is higher than a high material level switch or not;
if yes, increasing the discharging speed of the discharging rotary valve to enable the material level of the discharging chute to be lower than a high material level switch;
after delaying the third preset time, keeping the discharging speed of the discharging rotary valve consistent with the discharging speed of the corresponding discharging round roller;
if not, controlling the discharging rotary valve to keep the current discharging speed to run.
In a third aspect, an embodiment of the present application provides, in part, an apparatus for controlling leakage of flue gas from an adsorption tower, including:
the starting module is used for starting the discharging round roller of the adsorption tower to start discharging;
the first judging module is used for judging whether a low material level switch of the discharging chute has a material level signal or not;
the material level control module is used for delaying a first preset time when a low material level switch of the discharging chute has a material level signal, so that the material level of the discharging chute is positioned at the middle position of the high material level switch and the low material level switch;
the discharging rotary valve control module is used for starting the discharging rotary valve and adjusting the discharging speed of the discharging rotary valve;
and the discharging round roller control module is used for increasing the discharging speed of the discharging round roller when the low material level switch of the discharging chute has no material level signal, and re-executing the operation of the first judging module after delaying the second preset time.
With reference to the third aspect, in one implementation manner, the control device further includes:
the second judging module is used for judging whether the material level of the discharging chute is higher than a high material level switch or not;
a first discharge rate control module for increasing the discharge rate of the discharge rotary valve when the level of the discharge chute is above the high level switch, such that the level of the discharge chute is below the high level switch;
the second discharging speed control module is used for keeping the discharging speed of the discharging rotary valve consistent with the discharging speed of the corresponding discharging round roller after delaying the third preset time;
and the third discharging speed control module is used for controlling the discharging rotary valve to keep the current discharging speed to run when the material level of the discharging chute is not higher than the high material level switch.
The application provides an adsorption tower flue gas leakage prevention control system, method and device, wherein the system comprises an adsorption tower and a control end, a V-shaped discharging chute is arranged at the bottom of the adsorption tower, at least two discharging round rollers are arranged at the opening of the discharging chute, the bottom of the discharging chute is connected with a discharging rotary valve, and a high material level switch and a low material level switch are arranged on the side surface of the discharging chute; wherein the control terminal is configured to perform the steps of: starting a discharging round roller of the adsorption tower to start discharging; judging whether a low material level switch of the discharge chute has a material level signal or not; if yes, delaying a first preset time to enable the material level of the discharging chute to be located at the middle position of the high material level switch and the low material level switch, starting the discharging rotary valve, and enabling the discharging speed of the discharging rotary valve to be consistent with the discharging speed of the corresponding discharging round roller; if not, increasing the discharging speed of the discharging round roller, and after delaying the second preset time, judging whether a low material level switch of the discharging chute has a material level signal or not. By adopting the scheme, the active carbon materials can be always stored in the discharging chute, so that the sealing of the materials can be realized, and further, the leakage of smoke during the operation of the discharging rotary valve is prevented.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic structural diagram of an activated carbon desulfurization and denitrification system provided in the prior art;
FIG. 2 is a schematic structural diagram of an adsorption tower flue gas leakage prevention control system according to an embodiment of the present application;
FIG. 3 is a schematic flow chart of the control end execution steps in the flue gas leakage prevention control system of the adsorption tower provided by the embodiment of the application;
FIG. 4 is a schematic diagram of a method for controlling leakage of flue gas from an adsorption tower according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an apparatus for controlling leakage of flue gas from an adsorption tower according to an embodiment of the present application.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
As described in the background art of the present application, the sintering flue gas leaks and corrodes the discharging rotary valve 102 and other metal components through which the flue gas passes, in the prior art, the discharging mode of the adsorption tower 1 is generally according to the material balance requirement of the activated carbon desulfurization and denitrification system, the discharging rotary valve 102 at the bottom of the adsorption tower 1 is always in a running state, and the discharging speed is consistent with the discharging speed of the discharging round roller 101, in this case, the activated carbon discharged by the discharging round roller 101 is directly discharged from the discharging rotary valve 102, and when no activated carbon material exists between the discharging round roller 101 and the discharging rotary valve 102, the discharging rotary valve 102 rotates, so that the sintering flue gas leaks from the discharging rotary valve 102.
Accordingly, in order to prevent the sintering flue gas from leaking from the discharge rotary valve 102, the first embodiment of the present application discloses a flue gas leakage prevention control system of the adsorption tower 1, and referring to fig. 2, the control system may include: an adsorption tower 1 and a control end C.
The bottom of the adsorption tower 1 is provided with V-shaped discharge chute 103, at least two discharge round rollers 101 are arranged at the opening of each discharge chute 103, the bottom of each discharge chute 103 is connected with a discharge rotary valve 102, the side surface of each discharge chute 103 is provided with a high material level switch 1031 and a low material level switch 1032, the high material level switch 1031 is close to the upper part of the discharge chute 103, and the low material level switch 1032 is close to the bottom of the discharge chute 103.
In this embodiment, the discharging round roller 101 firstly discharges the activated carbon material in the adsorption tower 1 to the discharging chute 103, and then discharges the activated carbon material through the discharging rotary valve 102 at the bottom of the discharging chute 103, where a high level switch 1031 and a low level switch 1032 are arranged on the side surface of the discharging chute 103, so as to detect the level of the activated carbon material, so long as the activated carbon material is always stored in the discharging chute 103, the material sealing can be realized, and further, the leakage of the flue gas during the operation of the discharging rotary valve 102 is prevented.
Specifically, as one possible implementation, the vertical height of the low level switch 1032 from the bottom of the discharge chute 103 may be set to 100-300 mm, and the vertical distance between the high level switch 1031 and the low level switch 1032 may be set to 300-500 mm.
To ensure that the discharge chute 103 has active carbon material stored therein at all times, the control end C is configured to perform the following steps, with reference to fig. 3, including:
step S11, starting the discharging round roller 101 of the adsorption tower 1, and starting discharging.
In this step, the discharge round roller 101 of the adsorption tower 1 is first started to discharge the activated carbon in the adsorption tower 1 to the discharge chute 103, and at this time, the discharge rotary valve 102 at the bottom of the adsorption tower 1 is temporarily not operated. Wherein the initial discharging speed of the discharging round roller 101 can be determined according to the discharging speed of the adsorption tower 1, and the discharging speed of the adsorption tower 1 is determined according to the sintering flue gas flow and SO 2 Concentration, NO X The concentration was determined and its speed was noted as W1 in t/h.
Step S12 determines whether the low level switch 1032 of the pour spout 103 has a level signal.
In step S13, if yes, a first preset time is delayed to enable the material level of the discharge chute 103 to be in the middle position of the high level switch 1031 and the low level switch 1032.
In this step, if the low level switch 1032 has a level signal, the start of the discharge rotary valve 102 is resumed after a first predetermined time delay, the first predetermined time delay being for the purpose of ensuring that the level of the discharge chute 103 is at an intermediate position between the high level switch 1031 and the low level switch 1032, i.e. that the level is at an intermediate value, i.e. that activated carbon material is always stored in the discharge chute 103.
The first preset time may be based on the discharge speed and the volume increased during this time, for example, the honeycomb pattern in fig. 2 is the volume V increased, and the volume V may be calculated according to the structure of the discharge chute 103, and specifically, as a possible implementation manner, the first preset time may be obtained by the following method:
wherein, T1 is a first preset time, unit: s; v is the volume that the level in the intermediate position of the high level switch 1031 and the low level switch 1032 needs to be increased relative to the low level switch 1032, in: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρ is the density of the activated carbon, t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the W1 is the discharge speed of the discharge round roller 101, unit: t/h.
In step S14, the discharging rotary valve 102 is started, so that the discharging speed of the discharging rotary valve 102 is consistent with the discharging speed of the corresponding discharging round roller 101.
In this step, after the material level of the discharge chute 103 is at the intermediate position of the high level switch 1031 and the low level switch 1032, the discharge rotary valve 102 is started to start discharging, and at this time, the discharge speed of the discharge rotary valve 102 is controlled to be substantially equal to the discharge speed of the discharge round roller 101, so that it is ensured that the discharge chute 103 stores a certain amount of activated carbon material, thereby realizing material sealing and preventing leakage of sintering flue gas.
Step S15, if not, increasing the discharging speed of the discharging round roller 101, delaying the second preset time, and restarting to execute step S12, thereby performing the cycle.
In this step, the step S12 is performed after the step S12, that is, if the low level switch 1032 has no level signal, the discharging speed of the discharging round roller 101 may be increased, the discharging speed of the discharging round roller 101 is adjusted by 10% -50%, preferably 20%, of the value W1, the discharging speed of the discharging round roller 101 after adjustment is w2=w1+Δw1, and after the low level switch 1032 keeps running for the second preset time, it is determined again whether the low level switch 1032 has the level signal, so as to cycle.
The second preset time is similar to the first preset time in terms of calculation method, and specific reference may be made to the first preset time calculation method, which is not repeated.
The embodiment of the application provides a flue gas leakage prevention control system of an adsorption tower 1, which comprises the adsorption tower 1 and a control end C, wherein a V-shaped discharging chute 103 is arranged at the bottom of the adsorption tower 1, at least two discharging round rollers 101 are arranged at the opening of the discharging chute 103, the bottom of the discharging round rollers is connected with a discharging rotary valve 102, and a high material level switch 1031 and a low material level switch 1032 are arranged on the side surface of the discharging round rollers; wherein the control terminal C is configured to perform the steps of: starting a discharging round roller 101 of the adsorption tower 1 to start discharging; determining whether the low level switch 1032 of the discharge chute 103 has a level signal; if yes, delaying the first preset time to enable the material level of the discharging chute 103 to be located at the middle position of the high material level switch 1031 and the low material level switch 1032, starting the discharging rotary valve 102, and enabling the discharging speed of the discharging rotary valve 102 to be consistent with the discharging speed of the corresponding discharging round roller 101; if not, the discharge speed of the discharge roller 101 is increased, and after a second preset time delay, it is again determined whether the level signal is present in the low level switch 1032 of the discharge chute 103. By adopting the scheme, the active carbon materials can be always stored in the discharging chute 103, so that the sealing of the materials can be realized, and further, the leakage of the flue gas during the operation of the discharging rotary valve 102 is prevented.
To prevent the level from growing too fast beyond the high level switch 1031, causing the discharge chute 103 to accumulate too much activated carbon material, the control end C is further configured to:
it is determined whether the level of the discharge chute 103 is above the high level switch 1031.
If so, the discharge speed of the discharge rotary valve 102 is increased, and after a third predetermined time, it is determined again whether the level of the discharge chute 103 is higher than the high level switch 1031.
If the high level switch 1031 is signaled, it indicates that the level of the discharge chute 103 is higher than the high level switch 1031, i.e., that there is too much activated carbon material in the discharge chute 103, and at this time, the discharge speed W3 of the discharge rotary valve 102 needs to be increased by 10% -50%, preferably 20%, of the value W3, so that the discharge speed of the discharge rotary valve 102 after adjustment is w4=w3+Δw3, and after the operation of W4 is maintained for a third preset time, it is again determined whether the level of the discharge chute 103 is higher than the high level switch 1031, thereby performing the cycle.
The third preset time is similar to the first preset time, and the specific reference may be made to the first preset time calculation method, which is not described herein.
If not, the discharge rotary valve 102 is controlled to maintain the current discharge speed.
If the high level switch 1031 is not signaled, it is indicated that the level of the discharge chute 103 is below the high level switch 1031, at which time the discharge speed of both the discharge roller 101 and the discharge rotary valve 102 is controlled to remain unchanged.
As a possible implementation manner, the discharging speed of the discharging rotary valve 102 may be controlled by variable frequency motor driving control or by common motor driving control;
when variable frequency motor drive control is employed, control terminal C adjusts the discharge speed of the discharge rotary valve 102 by controlling the motor speed.
When the variable frequency motor is used for driving and controlling the discharging speed of the discharging rotary valve 102, the discharging speed of the discharging rotary valve 102 can be directly regulated through the speed of the variable frequency motor, and the driving mode has the advantages of high automation degree and convenience in control.
Specifically, in one implementation, when the variable frequency motor is used to control the discharging speed of the discharging rotary valve 102, the discharging speed of the discharging rotary valve 102 may be obtained according to the following method:
wherein: w (W) j When the variable frequency motor is controlled, the discharging speed of the discharging rotary valve 102 is t/h; v is the impeller volume of the rotary valve, m 3 R; n is the rotation speed of the rotary valve, r/min, and the rotation speed of the rotary valve adopts nVariable frequency speed regulation is adopted according to the actual discharging speed W j To adjust the rotary valve rotational speed n; η is the filling rate of the impeller and takes a value of 75-80%; ρ is the density of the activated carbon, t/m 3 。
When the common motor driving control is adopted, the control end C sets a time threshold, and intermittently starts the discharging rotary valve 102 within the time threshold to control the discharging speed of the discharging rotary valve 102.
When the discharging speed of the discharging rotary valve 102 is controlled by adopting a common motor, since the common motor cannot directly regulate the speed, the discharging speed needs to be controlled by periodically starting and stopping the discharging rotary valve 102, and a time threshold T needs to be set, for example: for 10 minutes, intermittently starting the discharge rotary valve 102 and stopping the discharge rotary valve 102 within a set time threshold to control the discharge speed of the discharge rotary valve 102 within the time threshold, for example, within a preset time threshold T, the start time of a common motor is T 1 Stop time is T 2 And t=t 1 +T 2 The common motor has the advantage of saving cost.
Specifically, in one implementation, when the discharging speed of the discharging rotary valve 102 is controlled by using a common motor, the discharging speed of the discharging rotary valve 102 is obtained according to the following method:
wherein W is 1 When the motor is controlled by a common motor, the discharging speed of the discharging rotary valve 102 is t/h; n is n 1 The rotating speed of the common motor is r/min; w (W) 2 When the motor is controlled by a common motor, the discharging speed of the discharging rotary valve 102 within a preset time threshold value is t/h; t is a preset time threshold value, T 1 And within a preset time threshold, the common motor is started for a time.
The second embodiment of the present application discloses a control method for preventing leakage of flue gas from an adsorption tower, which is applicable to the control system for preventing leakage of flue gas from an adsorption tower disclosed in the first embodiment, and referring to fig. 4, the control method includes:
s21, starting a discharging round roller of the adsorption tower, and starting discharging;
step S22, judging whether a low material level switch of the discharging chute has a material level signal or not;
step S23, if yes, delaying a first preset time to enable the material level of the discharging chute to be located at the middle position of a high material level switch and a low material level switch;
step S24, starting a discharging rotary valve, so that the discharging speed of the discharging rotary valve is consistent with the discharging speed of the corresponding discharging round roller;
and S25, if not, increasing the discharging speed of the discharging round roller, and after delaying the second preset time, judging whether a low material level switch of the discharging chute has a material level signal or not.
Further, to prevent the level from growing too fast, exceeding the high level switch, the control method further comprises:
step S26, judging whether the material level of the discharging chute is higher than a high material level switch;
step S27, if yes, increasing the discharging speed of a discharging rotary valve to enable the material level of the discharging chute to be lower than a high material level switch;
step S28, after delaying the third preset time, keeping the discharging speed of the discharging rotary valve consistent with the discharging speed of the corresponding discharging round roller;
and step S29, if not, controlling the discharging rotary valve to keep the current discharging speed to run.
In this embodiment, specific processes and details in each step of the control method may refer to the above-mentioned control system embodiment, and are not described herein.
The following are examples of the apparatus of the present application that may be used to perform the method embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the method of the present application.
The embodiment of the application also provides a flue gas leakage prevention control device of the adsorption tower, referring to fig. 5, the control device comprises:
the starting module 10 is used for starting the discharging round roller of the adsorption tower to start discharging;
a first determining module 20 for determining whether a low level switch of the discharge chute has a level signal;
a level control module 30 for delaying a first preset time when a low level switch of the discharge chute has a level signal, so that the level of the discharge chute is at an intermediate position between the high level switch and the low level switch;
a discharging rotary valve control module 40 for starting the discharging rotary valve and adjusting the discharging speed of the discharging rotary valve;
the discharging round roller control module 50 is configured to increase the discharging speed of the discharging round roller when the low level switch of the discharging chute has no level signal, and to re-execute the operation of the first judging module after delaying the second preset time.
Further, in one implementation, the control device further includes:
a second determination module 60 for determining whether the level of the discharge chute is above a high level switch;
a first discharge rate control module 70 for increasing the discharge rate of the discharge rotary valve to lower the level of the discharge chute below the high level switch when the level of the discharge chute is above the high level switch;
a second discharging speed control module 80, configured to keep the discharging speed of the discharging rotary valve consistent with the discharging speed of the corresponding discharging round roller after delaying for a third preset time;
a third discharge rate control module 90 for controlling the discharge rotary valve to maintain current discharge rate operation when the discharge chute level is not higher than the high level switch.
The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, as far as reference is made to the description in the method embodiments.
The application has been described in detail in connection with the specific embodiments and exemplary examples thereof, but such description is not to be construed as limiting the application. It will be understood by those skilled in the art that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (9)
1. An adsorption tower flue gas leakage prevention control system, comprising: an adsorption tower (1) and a control end;
the bottom of the adsorption tower (1) is provided with V-shaped discharge chute (103), at least two discharge round rollers (101) are arranged at the opening of each discharge chute (103), the bottom of each discharge chute (103) is connected with a discharge rotary valve (102), the side surface of each discharge chute (103) is provided with a high material level switch (1031) and a low material level switch (1032), the high material level switch (1031) is close to the upper part of the discharge chute (103), and the low material level switch (1032) is close to the bottom of the discharge chute (103);
the control terminal is configured to perform the steps of:
starting a discharging round roller (101) of the adsorption tower (1) to start discharging;
determining whether a low level switch (1032) of the discharge chute (103) has a level signal;
if yes, delaying a first preset time to enable the material level of the discharging chute (103) to be in the middle position of a high material level switch (1031) and a low material level switch (1032);
starting the discharging rotary valve (102) to enable the discharging speed of the discharging rotary valve (102) to be consistent with the discharging speed of the corresponding discharging round roller (101);
if not, increasing the discharging speed of the discharging round roller (101), and after delaying for a second preset time, judging whether a low material level switch (1032) of the discharging chute (103) has a material level signal or not;
wherein the first pre-stepThe time is set as follows:
the second preset time is as follows:
t1 is a first preset time, unit: s; t2 is a second preset time, unit: s; v is the volume that the level in the intermediate position of the high level switch 1031 and the low level switch 1032 needs to be increased relative to the low level switch 1032, in: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρ is the density of the activated carbon, t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the W1 is the discharge speed of the discharge round roller 101, unit: t/h, ΔW1 is the discharge speed adjustment amplitude value of the discharge round roller 101, unit: t/h.
2. The control system of claim 1, wherein the control terminal is further configured to:
determining whether the level of the discharge chute (103) is above a high level switch (1031);
if yes, increasing the discharging speed of the discharging rotary valve (102), and after delaying for a third preset time, judging whether the material level of the discharging chute (103) is higher than a high material level switch (1031) again;
if not, controlling the discharging rotary valve (102) to keep the current discharging speed to run;
wherein, the third preset time is:
t3 is a third preset time, unit: s; w3 is the discharge speed W3 of the discharge rotary valve 102, in units of: t/h, V1 is the volume of the level at a position above the high level switch 1031 that needs to be reduced relative to the high level switch 1031, in units of: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the Δw3 is the discharge speed adjustment amplitude value of the discharge rotary valve 102, and the unit is: t/h.
3. The control system according to claim 1, characterized in that the control of the discharge speed of the discharge rotary valve (102) can be controlled with a variable frequency motor drive or with a normal motor drive;
when the variable frequency motor drive control is adopted, the control end adjusts the discharging speed of the discharging rotary valve (102) by controlling the motor speed;
when common motor driving control is adopted, the control end sets a time threshold, and the discharging rotary valve (102) is intermittently started within the time threshold so as to control the discharging speed of the discharging rotary valve (102).
4. A control system according to claim 3, characterized in that when the discharge speed of the discharge rotary valve (102) is controlled by means of a variable frequency motor, the discharge speed of the discharge rotary valve (102) is obtained in the following way:
wherein: w (W) j When the variable frequency motor is controlled, the discharging speed of the discharging rotary valve is t/h; v is the impeller volume of the rotary valve, m 3 R; n is the rotating speed of the rotary valve, r/min; η is the filling rate of the impeller and takes a value of 75-80%; ρ is the density of the activated carbon, t/m 3 。
5. The control system according to claim 4, characterized in that when the discharge speed of the discharge rotary valve (102) is controlled by a common motor, the discharge speed of the discharge rotary valve (102) is obtained as follows:
wherein W is 1 When the motor is controlled by a common motor, the discharging speed of the discharging rotary valve is t/h; n is n 1 The rotating speed of the common motor is r/min; w (W) 2 When the motor is controlled by a common motor, the discharging speed of the discharging rotary valve within a preset time threshold value is t/h; t is a preset time threshold value, T 1 And within a preset time threshold, the common motor is started for a time.
6. The control system according to claim 1, characterized in that the initial discharge speed of the discharge roller (101) is determined in accordance with the discharge speed of the adsorption column (1).
7. A control method for preventing leakage of flue gas from an adsorption tower, wherein the control method is applied to the control system according to any one of claims 1 to 6, and the control method comprises:
starting a discharging round roller of the adsorption tower to start discharging;
judging whether a low material level switch of the discharging chute has a material level signal or not;
if yes, delaying a first preset time to enable the material level of the discharging chute to be located at the middle position of the high material level switch and the low material level switch;
starting a discharging rotary valve, so that the discharging speed of the discharging rotary valve is consistent with the discharging speed of the corresponding discharging round roller;
if not, increasing the discharging speed of the discharging round roller, and after delaying the second preset time, judging whether a low material level switch of the discharging chute has a material level signal or not;
the first preset time is as follows:
the second preset time is as follows:
t1 is a first preset time, unit: s; t2 is a second preset time, unit:s; v is the volume that the level in the intermediate position of the high level switch 1031 and the low level switch 1032 needs to be increased relative to the low level switch 1032, in: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρ is the density of the activated carbon, t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the W1 is the discharge speed of the discharge round roller 101, unit: t/h, ΔW1 is the discharge speed adjustment amplitude value of the discharge round roller 101, unit: t/h.
8. The control method according to claim 7, characterized in that the control method further comprises:
judging whether the material level of the discharging chute is higher than a high material level switch or not;
if yes, increasing the discharging speed of the discharging rotary valve to enable the material level of the discharging chute to be lower than a high material level switch;
after delaying the third preset time, keeping the discharging speed of the discharging rotary valve consistent with the discharging speed of the corresponding discharging round roller;
if not, controlling the discharging rotary valve to keep the current discharging speed to run;
wherein, the third preset time is:
t3 is a third preset time, unit: s; w3 is the discharge speed W3 of the discharge rotary valve 102, in units of: t/h, V1 is the volume of the level at a position above the high level switch 1031 that needs to be reduced relative to the high level switch 1031, in units of: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the Δw3 is the discharge speed adjustment amplitude value of the discharge rotary valve 102, and the unit is: t/h.
9. An adsorption tower flue gas leakage prevention control device, characterized in that the adsorption tower flue gas leakage prevention control device is applied to the adsorption tower flue gas leakage prevention control system according to any one of claims 1 to 6, comprising:
the starting module is used for starting the discharging round roller of the adsorption tower to start discharging;
the first judging module is used for judging whether a low material level switch of the discharging chute has a material level signal or not;
the material level control module is used for delaying a first preset time when a low material level switch of the discharging chute has a material level signal, so that the material level of the discharging chute is positioned at the middle position of the high material level switch and the low material level switch;
the discharging rotary valve control module is used for starting the discharging rotary valve and adjusting the discharging speed of the discharging rotary valve;
the discharging round roller control module is used for increasing the discharging speed of the discharging round roller when the low material level switch of the discharging chute has no material level signal, and re-executing the operation of the first judging module after delaying the second preset time;
the first preset time is as follows:
the second preset time is as follows:
t1 is a first preset time, unit: s; t2 is a second preset time, unit: s; v is the volume that the level in the intermediate position of the high level switch 1031 and the low level switch 1032 needs to be increased relative to the low level switch 1032, in: m is m 3 The method comprises the steps of carrying out a first treatment on the surface of the ρ is the density of the activated carbon, t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the W1 is the discharge speed of the discharge round roller 101, unit: t/h, ΔW1 is the discharge speed adjustment amplitude value of the discharge round roller 101, unit: t/h.
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