CN111375255A - Dust collecting and discharging system of cement mill - Google Patents
Dust collecting and discharging system of cement mill Download PDFInfo
- Publication number
- CN111375255A CN111375255A CN202010270149.7A CN202010270149A CN111375255A CN 111375255 A CN111375255 A CN 111375255A CN 202010270149 A CN202010270149 A CN 202010270149A CN 111375255 A CN111375255 A CN 111375255A
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- Prior art keywords
- dust
- air
- dust collector
- bag
- dust collecting
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- 239000000428 dust Substances 0.000 title claims abstract description 208
- 239000004568 cement Substances 0.000 title claims abstract description 28
- 238000007599 discharging Methods 0.000 title claims abstract description 11
- 238000005507 spraying Methods 0.000 claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000003801 milling Methods 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 description 20
- 238000007664 blowing Methods 0.000 description 18
- 238000004887 air purification Methods 0.000 description 8
- 210000001367 Arteries Anatomy 0.000 description 4
- 210000003462 Veins Anatomy 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000006011 modification reaction Methods 0.000 description 3
- 210000003284 Horns Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/48—Removing dust other than cleaning filters, e.g. by using collecting trays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0233—Other waste gases from cement factories
Abstract
The invention discloses a cement mill dust collecting and discharging system which comprises a roller press dust collecting mechanism and a tail milling dust collecting mechanism which are sequentially arranged on a new cement production line, wherein the roller press dust collecting mechanism comprises a duplex cyclone dust collecting cylinder and a main pulse spraying bag dust collector, the duplex cyclone dust collecting cylinder is arranged at an outlet of a gas-powder mixture of the roller press, the duplex cyclone dust collecting cylinder is connected with a feeding end of the main pulse spraying bag dust collector through an air pipe, the tail milling dust collecting mechanism comprises a secondary pulse spraying bag dust collector, and the secondary pulse spraying bag dust collector is connected with a cement mill through an air pipe. The problem of dust collecting effect of dust collecting system is not good when current cement manufacture is solved.
Description
Technical Field
The invention relates to the field of cement cleaning production, in particular to a dust collecting and discharging system of a cement mill.
Background
In the cement production process, a large amount of dust is generated during material processing, and if the dust is not processed well, the environment is seriously polluted, but the dust collection system in the prior art is not perfect in design, and the dust collection task of certain key parts cannot be finished perfectly.
Disclosure of Invention
The invention aims to provide a dust collecting and discharging system of a cement mill, which solves the problem of poor dust collecting effect of the dust collecting system in the existing cement production.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a cement mill dust collection dust discharging system, includes the roller press mechanism of gathering dust and the mill tail mechanism of gathering dust that sets gradually on new cement production line, roller press mechanism of gathering dust includes that pair whirlwind suction drum spouts a bag dust collector with main arteries and veins, pair whirlwind suction drum sets up in roller press air-powder mixture exit, and pair whirlwind suction drum passes through the tuber pipe and links to each other with the feed end that bag dust collector was spouted to main arteries and veins, mill tail mechanism of gathering dust includes that bag dust collector is spouted to inferior arteries and veins, bag dust collector is spouted through the tuber pipe and cement mill links to each other for inferior arteries and veins.
The dust collecting mechanism of the roller press and the tail grinding dust collecting mechanism are respectively designed, so that dust generated in cement production can be completely absorbed, and the best dust collecting effect is achieved.
As a further preferred aspect of the present invention, the main pulse spraying bag dust collector is a dual-series pulse spraying bag dust collector.
The double-series pulse-jet bag dust collector is one of FDM novel pulse-jet bag type dust collectors, and is a new-generation bag type dust collector developed by referring to the latest technology at home and abroad on the basis of the original MC type pulse dust collector and combining the actual situation of the current pulse dust collector in China.
The dust collector adopts a high-pressure (0.4-0.7 MPa) large-flow pulse airflow strip-by-strip filter bag blowing dust cleaning technology, has the characteristics of large dust cleaning kinetic energy, high dust cleaning efficiency, compact structure, less maintenance workload and the like, particularly has the characteristic of online dust cleaning, can continuously operate, overcomes the defects of shutdown dust cleaning and high equipment failure rate of the original mechanical vibration type dust collector, and is relatively ideal environment-friendly dust collecting equipment.
All filter bags of the dust collector adopt membrane-covered filter materials, the discharge concentration is lower than 20mg/Nm3, and the dust collection efficiency of collecting 0.3-2 mu m dust is superior to that of any other type of dust collector.
The control system adopts a pulse blowing controller to automatically control the ash removal.
When dust-containing gas enters the dust collector through the air pipe or the flange opening, the section of the air channel is expanded and the air speed is reduced under the guidance of the air channel, part of dust is settled on the wall of the dust hopper, fine dust flies into the filter bag chamber along with air flow and is uniformly dispersed on the surface of each filter bag, the dust is blocked outside the filter bag, purified gas passing through the filter bag enters the upper gas purifying box body through the opening of the filter bag, and finally the purified gas is discharged into the atmosphere through the outlet exhaust fan. One part of dust accumulated on the outer side of the filter bag falls into the dust hopper by the self weight, and the other part of dust is continuously left on the outer surface of the filter bag, so that the resistance of the equipment is gradually increased. In order to ensure that the resistance of the device does not exceed 1400Pa, the dust is required to be cleaned once every certain time or when the preset resistance is reached, and the dust deposited on the outer side of the filter bag is cleaned.
The working principle of the blowing system is as follows: one end of the pulse valve is connected with the compressed air main pipe, and the other end of the pulse valve is connected with the blowing pipe. The pulse valve back pressure chamber is connected with an exhaust valve, the action of the exhaust valve is operated by a microcomputer controller, when the controller has no signal output, the exhaust valve and the movable iron core seal the exhaust port, the pulse valve is in a closed state, and when the controller sends a signal, the exhaust valve enables the pulse valve back pressure chamber to be communicated with the atmosphere (pressure relief) and the pulse valve is opened instantly. Compressed air is injected into the Venturi tube at a very high speed through the small holes of the injection tube by a main compressed air pipeline through the pulse valve to cause instantaneous positive pressure in the filter bag, so that pulse ash removal is realized.
The mechanism of ash removal is as follows: in the air-purifying chamber, a blowing tube is mounted over every row of filter bags, and is connected with pulse valve and compressed air main pipe, on the blowing tube several small holes are set, every small hole is correspondent to the centre of a filter bag, when it is worked, the dust-cleaning period and blowing time (can be regulated at any time) can be set on the microcomputer controller according to the dust-containing gas property, etc. when the dust collector is worked, the microcomputer controller can automatically give out command to control every pulse valve to be opened, at this time the high-pressure air can be jetted from nozzle at very high speed, and the secondary gas whose air quantity is about 5-7 times of jetted air quantity can be sucked from periphery by means of horn tube (Venturi tube) and mixed with it, then can be flushed into the filter bag, like a "pulse bubble" moving from top to bottom to make the filter bag expand and deform to make impact vibration whose amplitude is not large, at the same time the backward air flow from inside to outside can be produced, the dust accumulated on the outer side of the filter bag is shaken off to the dust hopper.
As a further preferred feature of the present invention, the two-series pulse-jet bag dust collector includes a bag chamber, an air purification chamber and a dust hopper, which are sequentially arranged from top to bottom, wherein the air purification chamber is provided with filter bags, a jet hose is installed above each filter bag, the jet hose is connected to a pulse valve and a main compressed air pipe, two ends of the air purification chamber are respectively provided with an air inlet and an air outlet, a discharge port of the dust hopper is provided with a grid wheel, and the two air purification chambers and the two dust hoppers of the two-series pulse-jet bag dust collector are both provided with two grid wheels.
As a further preferable mode of the invention, the top of the tail end of the air chute at the lower end of the discharge port of the main pulse jet bag dust collector is also connected with an air chute dust collecting air pipe, and the air chute dust collecting air pipe is connected with an air chute dust collector.
The dust generated is further absorbed by the air chute dust collector.
As a further preferred aspect of the present invention, the secondary pulse jet bag dust collector is a single-series pulse jet bag dust collector.
As a further preferred feature of the present invention, the single series pulse jet bag dust collector includes a bag chamber, an air purification chamber and a dust hopper, which are sequentially arranged from top to bottom, the air purification chamber is provided with rows of filter bags, a jet hose is installed above each row of filter bags, the jet hose is connected to a pulse valve and a main compressed air pipe, two ends of the air purification chamber are respectively provided with an air inlet and an air outlet, a discharge port of the dust hopper is provided with a grid wheel, and the air purification chamber and the dust hopper of the double series pulse jet bag dust collector are both provided with one grid wheel.
Compared with the prior art, the invention can at least achieve one of the following beneficial effects:
1. the dust absorption effect is good.
2. The mechanical vibration type dust collector has the characteristics of large dust cleaning kinetic energy, high dust cleaning efficiency, compact structure, less maintenance workload and the like, and overcomes the defects of shutdown dust cleaning and high equipment failure rate of the original mechanical vibration type dust collector. .
3. The dust collecting air pipe of the old cement production line is utilized, so that the dust collecting effect reaches the best.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic structural diagram of a double-series pulse spraying bag dust collector.
Fig. 3 is a schematic structural diagram of a single-series pulse spraying bag dust collector.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Specific example 1:
fig. 1, fig. 2, fig. 3 show a cement mill dust collecting and unloading system, include roller press dust collecting mechanism 1 and mill tail dust collecting mechanism 2 that set up in proper order on new cement production line, roller press dust collecting mechanism 1 includes that duplex whirlwind suction drum and main pulse spout bag dust collector 3, duplex whirlwind suction drum sets up in roller press air-powder mixture exit, and duplex whirlwind suction drum passes through the tuber pipe and links to each other with the feed end of main pulse spout bag dust collector 3, mill tail dust collecting mechanism 2 includes that inferior pulse spouts bag dust collector 4, inferior pulse spouts bag dust collector 4 and links to each other with the cement mill through the tuber pipe.
The dust collecting mechanism of the roller press and the tail grinding dust collecting mechanism are respectively designed, so that dust generated in cement production can be completely absorbed, and the best dust collecting effect is achieved.
Specific example 2:
in this embodiment, a main pulse jet bag dust collector is further described on the basis of specific embodiment 1, and the main pulse jet bag dust collector 3 is a dual-series pulse jet bag dust collector.
The double-series pulse-jet bag dust collector is one of FDM novel pulse-jet bag type dust collectors, and is a new-generation bag type dust collector developed by referring to the latest technology at home and abroad on the basis of the original MC type pulse dust collector and combining the actual situation of the current pulse dust collector in China.
The dust collector adopts a high-pressure (0.4-0.7 MPa) large-flow pulse airflow strip-by-strip filter bag blowing dust cleaning technology, has the characteristics of large dust cleaning kinetic energy, high dust cleaning efficiency, compact structure, less maintenance workload and the like, particularly has the characteristic of online dust cleaning, can continuously operate, overcomes the defects of shutdown dust cleaning and high equipment failure rate of the original mechanical vibration type dust collector, and is relatively ideal environment-friendly dust collecting equipment.
All filter bags of the dust collector adopt membrane-covered filter materials, the discharge concentration is lower than 20mg/Nm3, and the dust collection efficiency of collecting 0.3-2 mu m dust is superior to that of any other type of dust collector.
The control system adopts a pulse blowing controller to automatically control the ash removal.
When dust-containing gas enters the dust collector through the air pipe or the flange opening, the section of the air channel is expanded and the air speed is reduced under the guidance of the air channel, part of dust is settled on the wall of the dust hopper, fine dust flies into the filter bag chamber along with air flow and is uniformly dispersed on the surface of each filter bag, the dust is blocked outside the filter bag, purified gas passing through the filter bag enters the upper gas purifying box body through the opening of the filter bag, and finally the purified gas is discharged into the atmosphere through the outlet exhaust fan. One part of dust accumulated on the outer side of the filter bag falls into the dust hopper by the self weight, and the other part of dust is continuously left on the outer surface of the filter bag, so that the resistance of the equipment is gradually increased. In order to ensure that the resistance of the device does not exceed 1400Pa, the dust is required to be cleaned once every certain time or when the preset resistance is reached, and the dust deposited on the outer side of the filter bag is cleaned.
The working principle of the blowing system is as follows: one end of the pulse valve is connected with the compressed air main pipe, and the other end of the pulse valve is connected with the blowing pipe. The pulse valve back pressure chamber is connected with an exhaust valve, the action of the exhaust valve is operated by a microcomputer controller, when the controller has no signal output, the exhaust valve and the movable iron core seal the exhaust port, the pulse valve is in a closed state, and when the controller sends a signal, the exhaust valve enables the pulse valve back pressure chamber to be communicated with the atmosphere (pressure relief) and the pulse valve is opened instantly. Compressed air is injected into the Venturi tube at a very high speed through the small holes of the injection tube by a main compressed air pipeline through the pulse valve to cause instantaneous positive pressure in the filter bag, so that pulse ash removal is realized.
The mechanism of ash removal is as follows: in the air-purifying chamber, a blowing tube is mounted over every row of filter bags, and is connected with pulse valve and compressed air main pipe, on the blowing tube several small holes are set, every small hole is correspondent to the centre of a filter bag, when it is worked, the dust-cleaning period and blowing time (can be regulated at any time) can be set on the microcomputer controller according to the dust-containing gas property, etc. when the dust collector is worked, the microcomputer controller can automatically give out command to control every pulse valve to be opened, at this time the high-pressure air can be jetted from nozzle at very high speed, and the secondary gas whose air quantity is about 5-7 times of jetted air quantity can be sucked from periphery by means of horn tube (Venturi tube) and mixed with it, then can be flushed into the filter bag, like a "pulse bubble" moving from top to bottom to make the filter bag expand and deform to make impact vibration whose amplitude is not large, at the same time the backward air flow from inside to outside can be produced, the dust accumulated on the outer side of the filter bag is shaken off to the dust hopper.
Specific example 3:
the present embodiment further describes the structure of a dual-series pulse-jet bag dust collector on the basis of specific embodiment 2, where the dual-series pulse-jet bag dust collector includes a bag chamber 5, an air purifying chamber 6, and a dust hopper 7, which are sequentially arranged from top to bottom, a row of filter bags 8 is arranged in the air purifying chamber 6, a blowing hose is installed above each row of filter bags 8, the blowing hose is connected to a pulse valve and a compressed air main pipe, an air inlet and an air outlet are respectively arranged at two ends of the air purifying chamber 6, a dividing wheel is arranged at a discharge outlet of the dust hopper 7, and the two air purifying chambers 6 and the dust hoppers 7 of the dual-series pulse-jet bag dust collector are both two.
Specific example 4:
in this embodiment, an air chute dust collection air pipe is additionally arranged on the basis of specific embodiment 1, and the top of the tail end of the air chute at the lower end of the discharge port of the main pulse jet bag dust collector 3 is also connected with the air chute dust collection air pipe which is connected with an air chute dust collector.
The dust generated is further absorbed by the air chute dust collector.
Specific example 5:
this embodiment is further described with reference to specific embodiment 1, where the secondary pulse jet bag dust collector 4 is a single-series pulse jet bag dust collector.
The single series pulse spraying bag type dust collector is also one of the FDM novel pulse spraying bag type dust collectors.
Specific example 6:
in this embodiment, a structure of a single-series pulse-jet bag dust collector is further described on the basis of specific embodiment 5, where the single-series pulse-jet bag dust collector includes a bag chamber 5, an air purifying chamber 6, and a dust hopper 7, which are sequentially arranged from top to bottom, a row of filter bags 8 is arranged in the air purifying chamber 6, a blowing hose is installed above each row of filter bags 8, the blowing hose is connected to a pulse valve and a compressed air main pipe, an air inlet and an air outlet are respectively arranged at two ends of the air purifying chamber 6, a dividing wheel is arranged at a discharge outlet of the dust hopper 7, and the air purifying chamber 6 and the dust hopper 7 of the single-series pulse-jet bag dust collector are both one.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a cement mill dust collection and dust discharge system, includes roll squeezer dust collecting mechanism (1) and mill tail dust collecting mechanism (2) that set up in proper order on new cement production line, its characterized in that: the roller press dust collection mechanism (1) comprises a duplex cyclone dust collection cylinder and a main pulse spraying bag dust collector (3), the duplex cyclone dust collection cylinder is arranged at an outlet of a gas-powder mixture of the roller press, the duplex cyclone dust collection cylinder is connected with a feed end of the main pulse spraying bag dust collector (3) through an air pipe, the tail grinding dust collection mechanism (2) comprises a secondary pulse spraying bag dust collector (4), and the secondary pulse spraying bag dust collector (4) is connected with a cement mill through the air pipe.
2. The dust collecting and discharging system of the cement grinding mill as claimed in claim 1, characterized in that: the main pulse spraying bag dust collector (3) is a double-series pulse spraying bag dust collector.
3. The dust collecting and discharging system of the cement grinding mill as claimed in claim 1, characterized in that: the double-series pulse spraying bag dust collector comprises a bag chamber (5), an air purifying chamber (6) and a dust hopper (7), wherein the bag chamber (5), the air purifying chamber (6) and the dust hopper (7) are sequentially arranged from top to bottom, a row of filter bags (8) are arranged in the air purifying chamber (6), a spraying hose is arranged above each row of filter bags (8), the spraying hose is connected with a pulse valve and a compressed air main pipe, an air inlet and an air outlet are respectively arranged at two ends of the air purifying chamber (6), a grid wheel is arranged at a discharge outlet of the dust hopper (7), and the air purifying chamber (6) and the dust hopper (7) of the double-series pulse spraying bag dust collector are two.
4. The dust collecting and discharging system of the cement grinding mill as claimed in claim 1, characterized in that: the tail end top of an air chute at the lower end of a discharge port of the main pulse spraying bag dust collector (3) is also connected with an air chute dust collecting air pipe, and the air chute dust collecting air pipe is connected with an air chute dust collector.
5. The dust collecting and discharging system of the cement grinding mill as claimed in claim 1, characterized in that: the secondary pulse spraying bag dust collector (4) is a single-series pulse spraying bag dust collector.
6. The dust collecting and discharging system of the cement grinding mill as claimed in claim 5, characterized in that: the single-series pulse spraying bag dust collector comprises a bag chamber (5), an air purifying chamber (6) and a dust hopper (7), wherein the bag chamber (5), the air purifying chamber (6) and the dust hopper (7) are sequentially arranged from top to bottom, a row of filter bags (8) are arranged in the air purifying chamber (6), a spraying hose is arranged above each row of filter bags (8), the spraying hose is connected with a pulse valve and a compressed air main pipe, an air inlet and an air outlet are respectively arranged at two ends of the air purifying chamber (6), a grid wheel is arranged at a discharge outlet of the dust hopper (7), and the air purifying chamber (6) and the dust hopper (7) of the single-series pulse spraying bag dust collector are both one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010270149.7A CN111375255A (en) | 2020-04-08 | 2020-04-08 | Dust collecting and discharging system of cement mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010270149.7A CN111375255A (en) | 2020-04-08 | 2020-04-08 | Dust collecting and discharging system of cement mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111375255A true CN111375255A (en) | 2020-07-07 |
Family
ID=71222865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010270149.7A Pending CN111375255A (en) | 2020-04-08 | 2020-04-08 | Dust collecting and discharging system of cement mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111375255A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114367346A (en) * | 2021-12-27 | 2022-04-19 | 江苏微雀信息科技有限公司 | Engineering material crushing apparatus is decorated to multiple shock attenuation protection formula medium absorption type |
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| WO1999037404A1 (en) * | 1998-01-26 | 1999-07-29 | Ssangyong Cement (Singapore) Limited | Roller press grinding plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114367346A (en) * | 2021-12-27 | 2022-04-19 | 江苏微雀信息科技有限公司 | Engineering material crushing apparatus is decorated to multiple shock attenuation protection formula medium absorption type |
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Application publication date: 20200707 |