CN113731082A - Cyclone separation spray dust removal process method - Google Patents
Cyclone separation spray dust removal process method Download PDFInfo
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- CN113731082A CN113731082A CN202010465406.2A CN202010465406A CN113731082A CN 113731082 A CN113731082 A CN 113731082A CN 202010465406 A CN202010465406 A CN 202010465406A CN 113731082 A CN113731082 A CN 113731082A
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Abstract
The invention discloses a cyclone separation spray dust removal process method, in particular to a DCS control system control method for a polymerization recovery cyclone separation spray dust removal process, which comprises the following steps: opening a water inlet valve of an upper spraying plate, closing a water inlet valve of a lower spraying plate, starting a draught fan to the upper spraying plate in the washing tower, starting rotational separation of a cyclone separation plate, after spraying for 30 minutes, automatically opening the water inlet valve of the lower spraying plate by a DCS control system, simultaneously closing the water inlet valve of the upper spraying plate, starting rotational separation of the cyclone separation plate, and after spraying for 30 minutes, further completing the cycle and the restart by the automatic control of the DCS; the residual gas passes through the recovery pipeline, the pressure in the dust removal system is controlled by the backflow pressure regulating valve, the recovered gas is sent to the monomer recovery device, and the sprayed liquid flows back to the polymerization mother liquor water tank to the mother liquor water treatment system, so that the effect of settling dust in the gas by reverse spraying is realized, the production process is optimized, and the invention can be widely applied to the rotational flow separation spraying dust removal production procedures in the production of different chemical fields.
Description
Technical Field
The invention relates to the technical field of dust removal in PVC powder drying production, in particular to a cyclone separation spraying dust removal process method for a polymerized PVC powder airflow cyclone drying system.
Background
At present, the known PVC powder drying production process technology is mature. The main process flow is as follows: most of moisture of the hot PVC slurry is removed by a centrifugal machine, the material enters an airflow dryer, is contacted and mixed with heated air, the moisture on the surface and inside of PVC resin is gradually removed in the conveying process, then the material enters a cyclone separator, the dried PVC material is separated from hot air, the gas is pumped out of a system by an induced draft fan, and is discharged to the atmosphere after the drying and washing tower removes dust and removes tiny PVC powder. In daily production, although the PVC resin powder reaches the standard and is discharged, partial PVC resin particles can be discharged along with gas in a system, particularly, when the PVC resin powder is abnormally produced, a large amount of gas possibly carried by the PVC resin powder is brought into the surrounding environment, serious environmental protection accidents are caused, meanwhile, the powder is gathered without being recycled and discharged, great influence is also caused on production loss, and the production cost is increased.
Disclosure of Invention
The invention aims to provide a cyclone separation spraying dust removal process method which optimizes a PVC dust removal process, effectively removes unseparated tiny particles in a cyclone separator, reduces PVC resin particles in gas emission of a drying system and is suitable for the cyclone separation spraying dust removal process method.
A cyclone separation spraying dust removal process method is characterized in that a DCS control system controls manual operation of a polymerization recovery cyclone separation spraying dust removal process: starting a water diversion pump, opening a water inlet valve of an upper spraying plate, closing a water inlet valve of a lower spraying plate, starting a draught fan to the upper spraying plate in the washing tower, starting a cyclone separation plate to rotate and separate, automatically opening the water inlet valve of the lower spraying plate by a DCS control system after spraying for 30 minutes, simultaneously closing the water inlet valve of the upper spraying plate, starting the cyclone separation plate to rotate and separate, spraying for 30 minutes, and then completing the circulation and the restart by the automatic control of the DCS; the residual gas passes through a recovery pipeline, the pressure in the dust removal system is controlled by a reflux pressure regulating valve, the recovered gas is sent to a monomer recovery device, and the sprayed liquid flows back to a polymerization mother liquor water tank to a mother liquor water treatment system.
The DCS distributed control system of the cyclone separation spraying dust removal process method comprises hardware and software, wherein the hardware comprises a field control station, an operation station, an engineer station, a communication network cable and the like; the software comprises an operating system platform and DCS configuration software for industrial control.
The rotational flow separation spraying dedusting process method presets manual and automatic processes of operation programs and presets spraying time on an operation picture of a DCS control system, when manual operation is selected, a water guide pump can be manually started → an upper spraying plate water inlet valve is opened → a lower spraying plate water inlet valve is closed → an upper spraying plate in a washing tower is opened → a draught fan is started, rotational flow separation plates start to rotate and separate, after the spraying time reaches 30 minutes, the lower spraying plate water inlet valve is manually opened → the upper spraying plate water inlet valve is closed → the lower spraying plate in the washing tower is reached, the rotational flow separation plates start to rotate and separate, and after spraying for 30 minutes, the next sequential operation can be manually executed;
the cyclone separation spraying dedusting process method presets manual and automatic operation procedures and presets spraying time on the operation picture of the DCS control system, and when automatic operation is selected, the procedures can be automatically executed, and an automatic cycle operation process is achieved.
According to the cyclone separation spraying dust removal process method, pressure reflux regulation control in the upper spraying plate, the lower spraying plate and the reflux pressure regulating valve in the washing tower is preset with automatic and manual, starting and stopping and pause control programs, and required operation can be carried out at any time when production is required.
According to the cyclone separation spraying dedusting process method, the recovered gas is sprayed in two stages.
The installation direction of the upper spray plate in the washing tower is clockwise, the direction of spray water is clockwise, the installation direction of the lower spray plate is anticlockwise, and the direction of spray water is anticlockwise.
According to the cyclone separation spraying dust removal process method, the multistage upper spraying plate, the lower spraying plate and the cyclone separation plate can be selected according to the spraying effect.
According to the cyclone separation spray dust removal process method, the height of the tower section of the washing tower can be increased, and the diameter can be increased.
According to the cyclone separation spray dedusting process method, liquid which is subjected to cyclone separation in the washing tower and sprayed can flow into the polymerization mother liquid water tank through a high head difference.
The cyclone separation spraying dedusting process method is characterized in that residual gas after cyclone separation and spraying of the washing tower is recycled in the monomer recycling tank.
The cyclone separation spraying dust removal process method is characterized in that residual gas subjected to cyclone separation and spraying by the washing tower is delivered to the monomer recovery tank, and a reflux pressure regulating valve is arranged on a residual gas recovery processing pipeline.
According to the cyclone separation spraying dust removal process method, the pressure backflow pressure regulating valve on the residual gas recovery processing pipeline takes backflow pressure as a main regulation parameter, the outlet pressure of the induced draft fan serves as an auxiliary regulation parameter, and the backflow pressure is controlled by the backflow pressure regulating valve, so that the whole process of controlling the whole washing tower cyclone separation spraying pressure and the whole washing tower cyclone separation spraying is achieved.
The pressure reflux pressure regulation control on the residual gas recovery processing pipeline comprises the following procedures that the preset reflux pressure target is set to be 0.30MPa, when the pressure reaches 0.30MPa, the reflux pressure regulating valve is in a manual mode and opens 50% of a valve position, automatic control is started, the set pressure of 0.30MPa is set as a main regulation parameter, when the pressure reaches the current reflux pressure in the recovery pipe monomer recovery tank, the pressure in the monomer tank is used as the main regulation parameter, the outlet pressure of a draught fan is used as an auxiliary regulation parameter, the reflux pressure regulating valve is started to be in cascade stable control, and when the recovery pressure is less than 0.10MPa, the reflux pressure regulating valve is directly regulated to be in the manual mode from an automatic mode or a cascade mode and closes the valve position by 0%.
The cyclone separation spray dust removal process method is characterized in that a cyclone separation spray dust removal device is arranged behind an induced draft fan system and in front of a polymerization mother liquor water system, the cyclone separation spray dust removal device mainly comprises a washing tower, a cyclone separation plate, a lower spray plate, an upper spray plate, a residual gas recovery processing pipeline and a reflux pressure regulating valve, a washing tower inlet pipeline is arranged at an outlet of the induced draft fan, a washing tower concentrated water pipe and a washing tower overflow pipe to a polymerization mother liquor water tank are arranged at the lower part of the washing tower, the cyclone separation plate, the lower spray plate and the upper spray plate are arranged inside the washing tower, and the residual gas recovery processing pipeline and the reflux pressure regulating valve to a monomer processing system are arranged at the top of the washing tower.
And the induced draft fan is arranged on an induced draft fan inlet pipeline on the upper parts of the cyclone separating unit and the star-shaped blanking device.
The washing tower is arranged at the outlet of the draught fan and the inlet pipeline of the washing tower, a cyclone separation plate is arranged inside the washing tower, a lower spray plate and an upper spray plate are arranged, a viewing mirror is arranged between the lower spray plate and the cyclone separation plate and at the tower body of the upper spray plate, and the top of the washing tower is provided with a residual gas recovery processing pipeline to a monomer processing system.
And the reflux pressure regulating valve is arranged on a residual gas recovery processing pipeline at the top of the washing tower.
And the residual gas recovery processing pipeline is arranged at the top of the washing tower and reaches the monomer processing system, and a reflux pressure regulating valve is arranged on the residual gas recovery processing pipeline.
The cyclone separation plate is arranged inside the washing tower and comprises a cyclone separation plate, a central ring bearing and a cyclone separation plate support plate, wherein a plurality of cyclone separation blades are uniformly distributed on the upper part of the cyclone separation plate along the outer ring of the cyclone separation plate and the inner ring of the cyclone separation plate, the cyclone separation plate support plate is arranged below the cyclone separation plate, and a central ring bearing seat is arranged on the support plate and is matched with the inner diameter of the cyclone separation plate through the central ring bearing.
The cyclone separation blades are uniformly distributed on the circumferences of the outer ring of the cyclone separation plate and the inner ring of the cyclone separation plate, the opening angles B of the blades are both 25 degrees, and the outer edges of the blades are provided with inward turning arcs.
The cyclone separation blades are uniformly distributed on the circumferences of the outer ring of the cyclone separation plate and the inner ring of the cyclone separation plate, and 20 blades are uniformly distributed.
The cyclone separation plate supporting plate comprises a cyclone separation plate supporting plate main rib, an auxiliary tie rib and a supporting base plate; the center bearing seat is formed, eight main ribs of a support plate of the cyclone separation plate are welded, eight auxiliary tie bars are welded in the middle, and the center bearing seat is arranged in the middle.
And a supporting base plate is arranged at the lower part of the cyclone separation plate supporting plate, and eight washing tower inner walls are uniformly distributed.
The upper spraying plate is provided with a spraying plate water conduit and a plurality of spraying plate conical nozzles, and the nozzles are uniformly distributed on the spraying plate outer ring water conduit at 60 degrees along the anticlockwise direction.
The lower spraying plate is provided with a spraying plate water conduit and a plurality of spraying plate conical nozzles, and the nozzles are uniformly distributed on the spraying plate outer ring water conduit at 60 degrees along the clockwise direction.
The inner through hole of the spray plate conical nozzle is communicated with the spray plate outer ring water conduit, and the spray angle range is 60-170 degrees.
The spray plate conical nozzle is connected with the spray plate outer ring water conduit through a screw thread by an outer screw thread at the lower part, and the conical degree of the upper part conical opening is 45 degrees with the horizontal plane.
The main purpose of the dust removal system is to carry out solid-gas separation on the mother liquor after passing through a cyclone unit and a star-shaped feeder in a polymerization drying section, a positive pressure induced draft fan delivers air into a washing tower through an air pipe, a cyclone separation plate, a lower spray plate and an upper spray plate of a spray device are arranged in the washing tower, the air delivery process of the induced draft fan is in reverse direction with the spray device, so that dust in gas is settled, the settled dust flows into a polymerization mother liquor pool by using a pipeline pump or a potential difference, and the recovered gas flows into a monomer treatment system, so that the dust removal effect is achieved. The whole dust removal system is provided with a washing tower, a cyclone separation plate, an upper spray plate, a lower spray plate, a reflux pressure regulating valve at the top of the washing tower and an automatic spray system, solves the problems of frequent operation and high operation strength of operators, ensures that the cyclone separation spray dust removal process control can reach an ideal control standard through an automatic control program, ensures that the drying tail gas enters the high-efficiency cyclone separation spray dust removal system after being pressurized by an induced draft fan through the design of the cyclone separation plate, the blades of the cyclone separation plate rotate by utilizing the internal pressure, remove dust in multiple angles, form blade arcs, block impurities at the lower part of the cyclone separation plate, and pass through the design of the upper spray plate and the lower spray plate through secondary spraying, the spray plate has a conical nozzle, is convenient to connect, is easy to disassemble and replace, increases the spray area after pressurization, has large spray angle and coverage area, and has more obvious effect, multilayer cyclone separation and multilayer spraying can be carried out according to the existing production conditions so as to fully remove dust and impurities; the gas sealed in the system can be recovered to the monomer treatment system, and meanwhile, the recovery pressure regulating valve on the residual gas recovery treatment pipeline has very obvious regulating effect on the whole system, so that the automatic control optimization of key processes in the PVC dust removal production is realized, and the invention can be widely applied to the cyclone separation spraying dust removal production processes in the production of different chemical fields.
In the above embodiment, the reference values of the dust removal reflux pressure and the induced draft fan outlet pressure can be a plurality according to experience requirements, and the specific values have very important relations with the size of the dust removal system device, the reaction characteristics and the production index.
The invention mainly relates to an improvement on automatic control and related control hardware devices in the operation of a cyclone separation spraying dust removal process method, and the design of a cyclone separation plate, a spray plate, a nozzle and a backflow pressure regulating valve is added, and the rest is the same as the prior art.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic view of a cyclone separation spray dedusting process flow in example 1 of the present invention.
Fig. 2 is a front view of a cyclone separation plate in the cyclone separation spray dust removal process method according to embodiment 1 of the present invention.
Fig. 3 is a left side view of a cyclone separation plate in the cyclone separation spray dust removal process method according to embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a cyclone separation blade in the cyclone separation spray dust removal process method according to embodiment 1 of the present invention.
Fig. 5 is a schematic view of a supporting pad structure in the cyclone separation spray dust removal process method according to embodiment 1 of the present invention.
Fig. 6 is a schematic diagram of an upper spray plate structure in the cyclone separation spray dust removal process method of embodiment 1 of the present invention.
Fig. 7 is a left side view of an upper spray plate in the cyclone separation spray dust removal process method of embodiment 1 of the present invention.
Fig. 8 is a schematic diagram of a lower spray plate structure in the cyclone separation spray dust removal process method of embodiment 1 of the present invention.
Fig. 9 is a left side view of a lower spray plate in the cyclone separation spray dust removal process of embodiment 1 of the present invention.
FIG. 10 is a schematic view of a spray plate conical nozzle in the cyclone separation spray dedusting process of example 1 of the present invention.
In FIG. 1, 1 is a polymerization mother liquor tank; 2 is a water diversion tank; 3 is an overflow pipe of a washing tower; 4 is a water pump; 5 is a draught fan; 6 is a washing tower concentrated water pipe; 7 is a water conduit; 8 is a washing tower; 9 is a washing tower concentrated water pipe; 10 is a washing tower overflow pipe; 11 is an inlet pipeline of the washing tower; 12 is a manhole at the inlet of the washing tower; 13 is a supporting plate of a cyclone separation plate; 14 is a cyclone separation plate; 15 is a lower spray plate; 16 is an upper spray plate; 17 is a sight glass; 18 is an inlet pipeline of a draught fan; 19 is a star-shaped feeder; 20 is a cyclone separator set; 21 is from the dry bed line; 22 is a water diversion spray pipe; 23 is a residual gas recovery processing pipeline; and 24 is a reflux pressure regulating valve.
In fig. 2-5, 131 is the main rib of the supporting plate of the cyclone separation plate; 132 is an auxiliary lacing wire; numeral 133 denotes a support pad; 134 is a central bearing seat; 141 is a cyclone separation plate outer ring; 142 is an inner ring of a cyclone separation plate; 143 is a cyclone separation plate blade; 144 is a center ring bearing.
In fig. 6, 161 is a spray plate outer ring conduit; 162 is a spray plate conical nozzle; 163 is a spray plate water conduit; 164 is a shower plate penstock flange.
Detailed Description
Referring to the attached drawings 1-10, embodiment 1 of the invention is a cyclone separation spray dust removal process method, wherein a DCS control system controls manual operation of a polymerization recovery cyclone separation spray dust removal process: starting a water diversion pump 4, opening an upper spray plate water inlet valve 160, closing a lower spray plate water inlet valve 150, leading the water to an upper spray plate 16 in a washing tower, starting a draught fan 5, starting the anticlockwise rotation separation of the cyclone separation plate 14, after spraying for 30 minutes, automatically opening the lower spray plate water inlet valve 150 by a DCS control system, simultaneously closing the upper spray plate water inlet valve 160, starting the clockwise rotation separation of the cyclone separation plate 14, spraying for 30 minutes, and then completing the circulation and the restart by the automatic control of the DCS; the residual gas passes through a recovery pipeline 23, the pressure in the dust removal system is controlled by a reflux pressure regulating valve 24, the recovered gas is sent to a monomer recovery device, and the sprayed liquid flows back to a polymerization mother liquid water tank 1 to a mother liquid water treatment system.
The DCS distributed control system of the cyclone separation spraying dust removal process method comprises hardware and software, wherein the hardware comprises a field control station, an operation station, an engineer station, a communication network cable and the like; the software comprises an operating system platform and DCS configuration software for industrial control.
The rotational flow separation spraying dedusting process method is characterized in that manual and automatic processes of operation programs are preset on an operation picture of a DCS control system, spraying time is preset, when manual operation is selected, a water guide pump 4 can be manually started, a water inlet valve 160 of an upper spraying plate is opened → a water inlet valve 150 of a lower spraying plate is closed → an upper spraying plate 16 in a washing tower is opened → a draught fan 4 is opened, the rotational flow separation plate 14 starts to rotate and separate anticlockwise, after the spraying time reaches 30 minutes, the water inlet valve 150 of the lower spraying plate is manually opened → the water inlet valve 160 of the upper spraying plate is closed → a lower spraying plate 15 in the washing tower 8, the rotational flow separation plate 14 starts to rotate and separate clockwise, and after spraying is carried out for 30 minutes, the next sequential operation can be manually executed;
the cyclone separation spraying dedusting process method presets manual and automatic operation procedures and presets spraying time on the operation picture of the DCS control system, and when automatic operation is selected, the procedures can be automatically executed, and an automatic cycle operation process is achieved.
According to the cyclone separation spraying dedusting process method, automatic and manual, starting and stopping and pause control programs are preset for pressure reflux regulation control in the upper spraying plate 16, the lower spraying plate 15 and the reflux pressure regulating valve 24 in the washing tower 8, and required operation can be performed at any time when production is needed.
According to the cyclone separation spraying dedusting process method, the recovered gas is sprayed in two stages.
The installation direction of the upper spray plate 16 in the washing tower 8 is clockwise, the spray water direction is clockwise, the installation direction of the lower spray plate 15 is counterclockwise, and the spray water direction is counterclockwise.
According to the cyclone separation spraying dedusting process method, the multistage upper spraying plate 15, the lower spraying plate 16 and the cyclone separation plate 14 can be selected according to the spraying effect.
According to the cyclone separation spray dust removal process method, the height of the tower section of the washing tower 8 can be increased, and the diameter can be increased.
In the cyclone separation and spray dedusting process, the liquid which is cyclone separated and sprayed by the washing tower can flow into the polymerization mother liquid water tank 1 through a high head difference.
The cyclone separation spraying dedusting process method is characterized in that residual gas after cyclone separation and spraying of the washing tower is recycled in the monomer recycling tank.
The cyclone separation spray dedusting process method is that the residual gas after cyclone separation and spraying of the washing tower 8 is sent to the monomer recovery tank, and the residual gas recovery processing pipeline 23 is provided with the reflux pressure regulating valve 24.
According to the cyclone separation spraying dust removal process method, the pressure backflow pressure regulating valve 24 on the residual gas recovery processing pipeline 23 takes backflow pressure as a main regulation parameter, the outlet pressure of the induced draft fan 5 as an auxiliary regulation parameter, and the backflow pressure is controlled by the backflow pressure regulating valve 24 so as to control the whole processes of cyclone separation spraying pressure of the whole washing tower 8 and cyclone separation spraying of the washing tower.
The pressure reflux pressure regulation control on the residual gas recovery processing pipeline 23 includes a program that a preset reflux pressure target is set to 0.30MPa, when the pressure reaches 0.30MPa, the reflux pressure regulating valve 24 is put into a manual mode and opens the valve position by 50%, the automatic control is carried out, the set pressure of 0.30MPa is set as a main regulation parameter, when the pressure reaches the current reflux pressure in the recovery pipe monomer recovery tank, the monomer tank pressure is used as the main regulation parameter, the outlet pressure of the induced draft fan 5 is used as an auxiliary regulation parameter, the reflux pressure regulating valve 24 is put into cascade stable control, and when the recovery pressure is less than 0.10MPa, the reflux pressure regulating valve 24 is directly regulated from an automatic or cascade mode to a manual mode and closes the valve position by 0%.
The cyclone separation spraying dust removal process method is characterized in that a cyclone separation spraying dust removal device is arranged behind a draught fan 5 system and in front of a polymerization mother liquor water system, the cyclone separation spraying dust removal device mainly comprises a washing tower 8, a cyclone separation plate 14, a lower spraying plate 15, an upper spraying plate 16, a residual gas recovery processing pipeline 23 and a reflux pressure regulating valve 24, an outlet of the draught fan 8 is provided with a washing tower inlet pipeline 11, the lower part of the washing tower 8 is provided with a washing tower concentrated water pipe 6, a washing tower overflow pipe 10 to a polymerization mother liquor water tank 1, the inside of the washing tower 5 is provided with the cyclone separation plate 14, the lower spraying plate 15 and the upper spraying plate 16, and the top of the washing tower 8 is provided with the residual gas recovery processing pipeline 23 and the reflux pressure regulating valve 24 to a monomer processing system.
The induced draft fan 5 is arranged on an inlet pipeline 18 of the induced draft fan 5 on the upper parts of the cyclone separator unit 20 and the star-shaped blanking device 19.
The washing tower 8 is arranged at the outlet of the draught fan 8 and the inlet pipeline 11 of the washing tower 8, a cyclone separation plate 14, a lower spray plate 15 and an upper spray plate 16 are arranged inside the washing tower 8, viewing mirrors 17 are arranged between the lower spray plate 15 and the cyclone separation plate 14 and at the tower body of the upper spray plate 16, and the top of the washing tower 8 is provided with a residual gas recovery processing pipeline 23 to a monomer processing system.
The reflux pressure regulating valve 24 is provided in the residual gas recovery processing line 23 at the top of the scrubber 8.
The residual gas recovery processing line 23 is provided at the top of the scrubber 8 to the monomer processing system, and has a reflux pressure regulating valve 24.
The cyclone separation plate 14 is arranged inside the washing tower 8 and is composed of the cyclone separation plate 14, a center ring bearing 144 and a cyclone separation plate support plate 13, a plurality of cyclone separation blades 143 are uniformly distributed on the upper portion of the cyclone separation plate 13 along the outer ring of the cyclone separation plate and the inner ring of the cyclone separation plate, the cyclone separation plate support plate is arranged below the cyclone separation plate, and a center ring bearing seat is arranged on the support plate and is matched with the inner diameter of the cyclone separation plate through the center ring bearing.
The cyclone separation blades 143 are uniformly distributed on the circumferences of the cyclone separation plate outer ring 141 and the cyclone separation plate inner ring 142, the opening angles B of the blades are both 25 degrees, and the outer edges of the blades are provided with inward-turning arcs.
The cyclone separation blades 143 are uniformly distributed on the circumferences of the cyclone separation plate outer ring 141 and the cyclone separation plate inner ring 142, and 20 blades are uniformly distributed.
The cyclone separation plate support plate 13 is composed of a cyclone separation plate support plate main rib 131, an auxiliary tie rib 132 and a support base plate 133; the center bearing seat 134 is formed by welding eight main ribs 131 of the cyclone separation plate supporting plate, welding eight auxiliary tie bars 132 in the middle and forming the center bearing seat 134 in the middle.
The lower part of the cyclone separation plate supporting plate 13 is provided with a supporting base plate 133, and eight inner walls of the washing tower 8 are uniformly distributed.
The cyclone separation blades 143 are uniformly distributed on the circumferences of the cyclone separation plate outer ring 141 and the cyclone separation plate inner ring 142, the opening angles B of the blades are both 25 degrees, and the outer edges of the blades are provided with inward-turning arcs.
The cyclone separation plate support plate 13 is composed of a cyclone separation plate support plate main rib 131, an auxiliary tie rib 132 and a support base plate 133; a central bearing seat 134.
The upper spray plate 16 is provided with a spray plate water conduit 163 and a plurality of spray plate conical nozzles 162, and the spray nozzles 162 are uniformly distributed on the spray plate outer ring water conduit 161 along the counterclockwise direction at 60 degrees.
The lower spray plate 15 is provided with a spray plate water conduit and a plurality of spray plate conical nozzles 162, and the nozzles 162 are uniformly distributed on the spray plate outer ring water conduit at 60 degrees along the clockwise direction.
The inner through hole of the spray plate conical nozzle 162 is communicated with the spray plate outer ring water conduit 161, and the spray angle range is 60-170 degrees.
The spray plate conical nozzle 162 is connected with the spray plate outer ring water conduit 161 through a screw thread by the lower outer screw thread, and the conical degree of the upper conical opening is 45 degrees with the horizontal plane.
The main purpose of the dust removal system is to carry out solid-gas separation on the mother liquor material after passing through a cyclone unit 20 and a star-shaped feeder 19 in a polymerization drying section, a positive pressure draught fan 5 delivers air to enter a washing tower 8 through an air pipe, a cyclone separation plate 14, a lower spray plate 15 and an upper spray plate 16 of a spray device are arranged in the washing tower 8, the air delivery process of the draught fan 5 is in reverse direction with that of the spray device, so that dust in the gas is settled, the settled gas flows into a polymerization mother liquor water tank 1 by using a pipeline pump or a head difference, and the recovered gas flows into a monomer treatment system, so that the dust removal effect is achieved. The whole dust removing system is provided with a washing tower 8, a cyclone separation plate 14, an upper spray plate 15, a lower spray plate 15, a 16 and a reflux pressure regulating valve 24 arranged at the top of the washing tower 8, and an automatic spray system is designed, so that the problems of frequent operation and high operation intensity of operators are solved, the cyclone separation spray dust removing process control can reach an ideal control standard through an automatic control program, the design of the cyclone separation plate 14, the upper spray plate 15, the lower spray plate 16 and the cyclone separation plate 15 enables drying tail gas to enter the high-efficiency cyclone separation spray dust removing system after being pressurized by an induced draft fan 5, the blades 143 of the cyclone separation plate rotate by using internal pressure to remove dust at multiple angles, blade arcs are formed to block impurities at the lower part of the cyclone separation plate 14, and then the impurities are blocked at the lower part of the cyclone separation plate 14 and then pass through the design of the upper spray plate 15, the lower spray plate 16 and the spray plate conical nozzles 162, so that the connection is convenient, the disassembly and the replacement are easy, and the spray area is enlarged after pressurization, the spraying angle and the coverage area are large, the effect is more obvious, and multilayer cyclone separation and multilayer spraying can be carried out according to the existing production condition to fully remove dust and impurities; the gas sealed in the system can be recovered to the monomer treatment system, and the recovery pressure regulating valve 24 on the residual gas recovery treatment pipeline 23 has very obvious regulating effect on the whole system, so that the automatic control optimization of key processes in the PVC dust removal production is realized.
In the above embodiment, the reference values of the dust removal reflux pressure and the induced draft fan outlet pressure can be a plurality according to experience requirements, and the specific values have very important relations with the size of the dust removal system device, the reaction characteristics and the production index.
The invention mainly relates to an improvement on automatic control and related control hardware devices in the operation of a cyclone separation spraying dust removal process method, and the design of a cyclone separation plate, a spray plate, a nozzle and a backflow pressure regulating valve is added, and the rest is the same as the prior art.
Claims (25)
1. A cyclone separation spraying dust removal process method is characterized in that a DCS control system controls the manual operation of a polymerization recovery cyclone separation spraying dust removal process: starting a water diversion pump, opening a water inlet valve of an upper spraying plate, closing a water inlet valve of a lower spraying plate, starting a draught fan to the upper spraying plate in the washing tower, starting a cyclone separation plate to rotate and separate, automatically opening the water inlet valve of the lower spraying plate by a DCS control system after spraying for 30 minutes, simultaneously closing the water inlet valve of the upper spraying plate, starting the cyclone separation plate to rotate and separate, spraying for 30 minutes, and then completing the circulation and the restart by the automatic control of the DCS; the residual gas passes through a recovery pipeline, the pressure in the dust removal system is controlled by a reflux pressure regulating valve, the recovered gas is sent to a monomer recovery device, and the sprayed liquid flows back to a polymerization mother liquor water tank to a mother liquor water treatment system.
2. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the DCS distributed control system is composed of hardware and software, wherein the hardware comprises a field control station, an operation station, an engineer station, a communication network cable and the like; the software comprises an operating system platform and DCS configuration software for industrial control.
3. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the DCS control system is characterized in that manual and automatic processes of operation programs are preset on an operation picture, the spraying time is preset, when manual operation is selected, a water diversion pump can be manually started → an upper spraying plate water inlet valve is opened → a lower spraying plate water inlet valve is closed → an induced draft fan is opened from the upper spraying plate to the inner part of a washing tower, a cyclone separation plate starts to rotate and separate, after the spraying time reaches 30 minutes, the lower spraying plate water inlet valve is manually opened → the upper spraying plate water inlet valve is closed → the lower spraying plate is arranged in the washing tower, the cyclone separation plate starts to rotate and separate, and after spraying for 30 minutes, the next sequential operation can be manually executed.
4. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the DCS control system is characterized in that manual and automatic processes of operation programs are preset on an operation picture of the DCS control system, spraying time is preset, when automatic operation is selected, the processes can be automatically executed, and an automatic circulating operation process is achieved.
5. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the pressure reflux regulation control in the upper spray plate, the lower spray plate and the reflux pressure regulating valve in the washing tower is preset with automatic and manual, starting and stopping and pause control programs, and required operation can be carried out at any time when production is required.
6. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the recovered gas is sprayed in two stages.
7. The cyclone separation spray dedusting process method as claimed in claim 6, characterized in that: the installation direction of the upper spray plate in the washing tower is clockwise, the direction of spray water is clockwise, the installation direction of the lower spray plate is anticlockwise, and the direction of spray water is anticlockwise.
8. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: according to the spraying effect, a multi-stage upper spraying plate, a multi-stage lower spraying plate and a multi-stage cyclone separation plate can be selected.
9. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the height of the tower section of the washing tower can be increased, and the diameter of the tower section of the washing tower can be enlarged.
10. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the liquid after cyclone separation and spraying of the washing tower can flow into a polymerization mother liquid water tank through a high potential difference.
11. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: and carrying out cyclone separation on the washing tower, and recovering the sprayed residual gas in a monomer recovery tank.
12. The cyclone separation spray dedusting process method as claimed in claim 1, characterized in that: the pressure reflux pressure regulating valve on the residual gas recovery processing pipeline takes reflux pressure as a main regulation parameter, the outlet pressure of the induced draft fan as an auxiliary regulation parameter, and the reflux pressure is controlled by the reflux pressure regulating valve, so that the whole process of controlling the whole washing tower cyclone separation spraying pressure and the washing tower cyclone separation spraying is achieved.
13. The cyclone separation spray dedusting process method as claimed in claim 12, characterized in that: the pressure reflux pressure regulation control on the residual gas recovery processing pipeline comprises the following procedures that a preset reflux pressure target is set to be 0.30MPa, when the pressure reaches 0.30MPa, the reflux pressure regulating valve is in a manual mode and is opened by 50 percent, automatic control is started, the set pressure of 0.30MPa is set as a main regulation parameter, when the pressure reaches the current reflux pressure in the recovery pipe monomer recovery tank, the pressure in the monomer tank is used as the main regulation parameter, the outlet pressure of a draught fan is used as an auxiliary regulation parameter, the reflux pressure regulating valve is started to be in cascade stable control, and when the recovery pressure is less than 0.10MPa, the reflux pressure regulating valve is directly regulated to be in the manual mode from an automatic mode or a cascade mode and is closed by 0 percent.
14. The dust removing device realized by the cyclone separation spraying dust removing process method as claimed in claim 1, is characterized in that: cyclone sprays dust collector sets up behind the draught fan system and before the polymerization mother liquor water system, cyclone sprays dust collector mainly by the scrubbing tower, the cyclone board, spray the board down, go up and spray the board, residual gas recovery processing pipeline, backflow pressure governing valve constitutes, the draught fan export is provided with scrubbing tower import pipeline, the scrubbing tower lower part is provided with the concentrated water pipe of scrubbing tower, the scrubbing tower overflow pipe is to polymerization mother liquor basin, the inside cyclone board that is provided with of scrubbing tower, spray the board down, go up and spray the board, the scrubbing tower top is provided with residual gas recovery processing pipeline, backflow pressure governing valve to monomer processing system.
15. The dust removal device realized by the cyclone separation spraying dust removal process method as claimed in claim 1, wherein the induced draft fan is arranged on an inlet pipeline of the induced draft fan at the upper parts of the cyclone separator set and the star-shaped blanking device.
16. The dust removing device realized by the cyclone separation spray dust removing process method according to claim 1, wherein the washing tower is arranged at the outlet of the induced draft fan and the inlet pipeline of the washing tower, the inside of the washing tower is provided with the cyclone separation plate, the lower spray plate and the upper spray plate, the viewing mirrors are arranged between the lower spray plate and the cyclone separation plate and at the tower body of the upper spray plate, and the top of the washing tower is provided with the residual gas recycling treatment pipeline to the monomer treatment system.
17. The dust removing device realized by the cyclone separation spraying dust removing process method as claimed in claim 1, is characterized in that: and the reflux pressure regulating valve is arranged on a residual gas recovery processing pipeline at the top of the washing tower.
18. The dust removing device realized by the cyclone separation spraying dust removing process method as claimed in claim 1, is characterized in that: and the residual gas recovery processing pipeline is arranged at the top of the washing tower and reaches the monomer processing system, and a reflux pressure regulating valve is arranged on the residual gas recovery processing pipeline.
19. The dust removing device realized by the cyclone separation spraying dust removing process method as claimed in claim 1, is characterized in that: the cyclone separation plate is arranged inside the washing tower, a cyclone separation plate supporting plate is arranged below the cyclone separation plate, a center ring bearing is arranged on the supporting plate and assembled with the inner diameter of the cyclone separation plate, a plurality of cyclone separation blades are uniformly distributed on the upper portion of the cyclone separation plate along the outer ring of the cyclone separation plate and the inner ring of the cyclone separation plate, the cyclone separation plate supporting plate is arranged on the lower portion of the cyclone separation plate, and the inner walls of the washing tower are uniformly distributed.
20. The dust removing device realized by the cyclone separation spraying dust removing process method as claimed in claim 19, wherein the cyclone separation blades are uniformly distributed at the circumferences of the outer ring and the inner ring of the cyclone separation plate, the opening angles B of the blades are both 25 degrees, and the outer edge is provided with an inward turning arc.
21. A dust-removing apparatus realized by a cyclone separation spray dust-removing process method as claimed in claim 19, wherein: the cyclone separation plate supporting plate comprises a cyclone separation plate supporting plate main rib, an auxiliary tie rib and a supporting base plate; and a central bearing seat.
22. A dust-removing apparatus realized by a cyclone separation spray dust-removing process method as claimed in claim 19, wherein: the upper spraying plate is provided with a spraying plate water conduit and a plurality of spraying plate conical nozzles, and the nozzles are uniformly distributed on the spraying plate outer ring water conduit at 60 degrees along the anticlockwise direction.
23. A dust-removing apparatus realized by a cyclone separation spray dust-removing process method as claimed in claim 19, wherein: the lower spraying plate is provided with a spraying plate water conduit and a plurality of spraying plate conical nozzles, and the nozzles are uniformly distributed on the spraying plate outer ring water conduit at 60 degrees along the clockwise direction.
24. A dust-removing apparatus realized by a cyclone separation spray dust-removing process method as claimed in claim 23, wherein: it is characterized in that the inner through hole of the spray plate conical nozzle is communicated with the outer ring water conduit of the spray plate, and the spray angle range is 60-170 degrees.
25. A dust-removing apparatus realized by a cyclone separation spray dust-removing process method as claimed in claim 23, wherein: the lower part of the spray plate conical nozzle is connected with the spray plate outer ring water conduit by screw threads, and the taper of the upper part conical opening is 45 degrees with the horizontal plane.
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| CN202010465406.2A CN113731082A (en) | 2020-05-28 | 2020-05-28 | Cyclone separation spray dust removal process method |
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| CN202010465406.2A CN113731082A (en) | 2020-05-28 | 2020-05-28 | Cyclone separation spray dust removal process method |
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