CN111569452A - Spray drying and dust removing method for bulk drug and dust explosion-proof system thereof - Google Patents
Spray drying and dust removing method for bulk drug and dust explosion-proof system thereof Download PDFInfo
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- CN111569452A CN111569452A CN202010443120.4A CN202010443120A CN111569452A CN 111569452 A CN111569452 A CN 111569452A CN 202010443120 A CN202010443120 A CN 202010443120A CN 111569452 A CN111569452 A CN 111569452A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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Abstract
The invention discloses a spray drying and dust removing method for bulk drugs, which comprises the following steps: s1: a starting procedure: introducing hot air into the system, and introducing the dedusted waste gas into a subsequent induced draft fan; s2: working procedures are as follows: the method comprises the following steps that materials enter a system from a material pipeline, are subjected to atomization drying in a pressure type spray dryer under the action of hot air, and are collected through a first discharge rotary valve at the bottom of the pressure type spray dryer to obtain dried materials; s3: a dust removal process: and the waste gas in the pressure type spray dryer is sequentially introduced into a cyclone separator and a bag type dust collector for primary dust removal and secondary dust removal. The invention also provides a dust explosion-proof system of the method. The invention can realize automatic detection of pressure, temperature and spark, and reduce the risk of dust combustion and dust explosion; realizing automatic waterfall and explosion suppression, and performing a series of safety interlocking and stopping; the influence range of dust combustion and explosion danger is reduced, and the safety production reliability is ensured; the feeding and discharging are automatic, and the operation continuity of the process system is ensured.
Description
Technical Field
The invention relates to the field of spray drying, in particular to a spray drying and dust removing method for bulk drugs and a dust explosion-proof system thereof.
Background
The spray drying technology is widely applied to the production and preparation of the raw material medicaments. In practical application, spray drying and dust removing facilities for continuous production are the most common. In such facilities, the material is often flammable or conductive dust, and in the case of dust containing a low amount of solvent, small particles and a high drying temperature, if static electricity or sparks occur, the dust is likely to be burned or exploded, and the personal and property safety is harmed.
In the existing spray drying and dust removing facilities, explosion-proof systems are not arranged in many cases, or only a waterfall door is arranged on equipment, explosion-proof measures are not considered, and the safety measures are not sufficient. If the method is applied to the indoor preparation production of the bulk drugs, the potential safety hazard is very large.
Therefore, the technical means with high safety factor and complete explosion-proof measures is applied to spray drying and dust removal of the bulk drugs, and is an important research direction.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
In a first aspect, the invention provides a spray drying and dust removing method for bulk drugs, which is applied to a spray drying and dust removing explosion-proof system for bulk drugs, and comprises the following steps:
s1: a starting procedure: hot air enters the bulk drug spray drying and dust removal explosion-proof system through a hot air pipeline, and the waste gas after dust removal enters a subsequent induced draft fan through a waste gas pipeline of a bag type dust collector;
s2: working procedures are as follows: the method comprises the following steps that materials enter a system from a material pipeline, are subjected to atomization drying in a pressure type spray dryer under the action of hot air, and are collected through a first discharge rotary valve at the bottom of the pressure type spray dryer to obtain dried materials;
s3: a dust removal process: and waste gas in the pressure type spray dryer is sequentially introduced into a cyclone separator and a bag type dust collector for primary dust removal and secondary dust removal, and the waste gas after dust removal is introduced into a waste gas pipeline of the bag type dust collector.
Preferably, the ash material obtained by the primary dust removal is collected by a second rotary discharge valve at the bottom of the cyclone separator; and collecting the ash obtained by secondary dust removal through a third discharging rotary valve at the bottom of the bag type dust collector.
The second aspect of the invention provides a dust explosion-proof system for the spray drying and dust removal method of the bulk drug, which comprises a pressure type spray dryer, a cyclone separator and a bag type dust remover, which are connected with each other through a spray drying waste gas pipeline and a cyclone separator waste gas pipeline in sequence; also comprises
The explosion-proof unit controls the influence range of dust combustion and explosion, and comprises a one-way passive explosion-proof valve arranged on a hot air pipeline in the pressure type spray dryer, a first chemical explosion-proof device arranged on a spray drying waste gas pipeline, a second chemical explosion-proof device arranged on a cyclone separator waste gas pipeline and a two-way passive explosion-proof valve arranged on a bag type dust collector waste gas pipeline;
and the automatic control unit controls whether to carry out safety interlocking and shut down according to the detected pressure value and temperature value, and comprises a pressure transmitter and a first temperature transmitter which are arranged on the pressure type spray dryer, a second temperature transmitter which is arranged on the cyclone waste gas pipeline, a cyclone waste gas pipeline and a differential pressure transmitter which is arranged on the bag type dust collector waste gas pipeline.
Preferably, the explosion venting unit comprises a flameless waterfall venting device arranged on the pressure type spray dryer and a waterfall venting plate arranged on the bag type dust collector.
Preferably, the automatic control unit controls whether the first chemical explosion-proof device or the second chemical explosion-proof device is started or not according to a state signal of the explosion venting unit.
Preferably, the automatic control unit controls whether the system is in safety interlocking and stops according to the state signal of the explosion-proof unit.
Preferably, the automatic control unit further comprises the first discharge rotary valve, the second discharge rotary valve and the third discharge rotary valve, and the automatic control unit controls whether a system is safely interlocked and shut down according to status signals of the first discharge rotary valve, the second discharge rotary valve and the third discharge rotary valve.
Preferably, the cyclone separator and the baghouse are arranged in an outdoor area.
Preferably, a switch valve is arranged on a material pipeline of the pressure type spray dryer.
Preferably, the first chemical explosion-proof device and the second chemical explosion-proof device comprise a spark detector, a pressure transmitter and a chemical explosion-proof bottle.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
(1) the invention adopts the technical means of combining explosion prevention, explosion suppression and detection prevention, thereby greatly improving the explosion-proof safety coefficient of the spray drying and dust removing equipment;
(2) the mechanical explosion suppression and the chemical explosion suppression are combined, so that the influence range of dust explosion is effectively controlled and controlled;
(3) by arranging a plurality of temperature and pressure sensors, the position sensitive to temperature and pressure change in the system is detected, and dust combustion and explosion are effectively prevented;
(4) the unloading automation is realized by combining the unloading rotary valve and the automatic control unit, and the whole system is stopped in time when the unloading fails;
(5) the explosion venting unit, the explosion suppression unit, the discharging device, the temperature detection device, the pressure detection device and the spark detection device are integrated into an integral safety system through the automatic control unit, so that the safety of facilities is guaranteed in an all-round manner.
Drawings
FIG. 1 is a schematic structural diagram of a dust explosion-proof system for a spray drying and dust removal method of bulk drugs according to the present invention;
the symbols in the drawings indicate the description:
1-pressure type spray dryer, 2-cyclone separator, 3-bag type dust collector, 4-one-way passive explosion-proof valve, 5-switch valve, 6-flameless explosion-proof device, 7-first discharging rotary valve, 8-first chemical explosion-proof device, 9-second discharging rotary valve, 10-second chemical explosion-proof device, 11-second temperature transmitter, 12-differential pressure transmitter, 13-two-way passive explosion-proof valve, 14-explosion-proof plate, 15-third discharging rotary valve, 16-hot air pipeline, 17-material pipeline, 18-spray drying waste gas pipeline, 19-cyclone separator waste gas pipeline, 20-bag type dust collector waste gas pipeline, 21-pressure transmitter, 22-first temperature transmitter.
Detailed Description
The invention provides a spray drying and dust removing method for a raw material medicine, which is applied to a spray drying and dust removing explosion-proof system for the raw material medicine and comprises the following steps:
s1: a starting procedure: hot air enters the spray drying and dust removal explosion-proof system of the bulk drug through a hot air pipeline 16, and the waste gas after dust removal enters a subsequent induced draft fan through a waste gas pipeline 20 of the bag type dust collector;
s2: working procedures are as follows: the material enters the system from a material pipeline 17, is atomized and dried in the pressure type spray dryer 1 under the action of hot air, and is collected through a first discharge rotary valve 7 at the bottom of the pressure type spray dryer 1 to obtain a dried material;
s3: a dust removal process: the waste gas in the pressure type spray dryer 1 is sequentially introduced into a cyclone separator 2 and a bag type dust collector 3 for primary dust removal and secondary dust removal, and the waste gas after dust removal is introduced into a waste gas pipeline 20 of the bag type dust collector.
In a specific embodiment of the invention, the ash obtained from the primary dust removal is collected by a second rotary discharge valve 9 at the bottom of the cyclone separator 2; the ash obtained by the secondary dust removal is collected by a third discharge rotary valve 15 at the bottom of the bag type dust collector 3.
On the basis of the technical means, the invention also provides a dust explosion-proof system for the spray drying and dust removal method of the bulk drugs, as shown in fig. 1, the dust explosion-proof system comprises a pressure type spray dryer 1, a cyclone separator 2 and a bag type dust remover 3 which are connected with each other through a spray drying waste gas pipeline 18 and a cyclone separator waste gas pipeline 19 in sequence;
an explosion suppression unit, the influence scope of control dust burning and explosion, it includes:
the one-way passive explosion-proof valve 4 is arranged on a hot air pipeline 16 in the pressure type spray dryer 1 and is used for preventing dust explosion in the pressure type spray dryer 1 from spreading to an air source;
the first chemical explosion-proof device 8 is arranged on the spray drying waste gas pipeline 18 and is used for preventing dust explosion in the pressure type spray dryer 1 from spreading to the cyclone separator 2;
the second chemical explosion-proof device 10 is arranged on the waste gas pipeline 19 of the cyclone separator and is used for preventing dust explosion in the bag type dust collector 3 from spreading to the cyclone separator 2;
the bag type dust collector waste gas pipeline 20 is provided with a bidirectional passive explosion-proof valve 13 for isolating dust explosion between the spray drying dust removal system and a subsequent induced draft fan;
an automatic control unit, according to pressure value and temperature value that detect, whether control carries out safety interlock and shut down, it includes:
the pressure transmitter 21 and the first temperature transmitter 22 are arranged on the pressure type spray dryer 1, and if the set temperature or pressure of the pressure type spray dryer 1 exceeds a preset range, the feeding temperature and pressure of hot air are interlockingly adjusted;
a second temperature transmitter 11 is arranged on the waste gas pipeline 19 of the cyclone separator, and when the temperature exceeds a set value, a second chemical explosion-proof device 10 is operated;
the pressure difference transmitter 12 arranged on the cyclone separator waste gas pipeline 19 and the bag type dust collector waste gas pipeline 20 sends out sound and light alarm signals when the pressure change of the inlet and the outlet of the bag type dust collector 3 is larger than an allowable value, and the whole system drying and dust collecting system is safely interlocked and stopped.
In actual production, the dust explosion-proof system of the spray dryer and the dust removal equipment needs to consider the following conditions:
(1) when dust combustion and dust explosion occur, timely waterfall is carried out;
(2) the explosion-proof device is arranged to prevent combustion and explosion from spreading to adjacent equipment when dust combustion and dust explosion occur;
(3) pressure and temperature transmitters are arranged in the system, so that the pressure and temperature in the system are found out in time, and the further development of the abnormal working condition into the dangers of dust combustion or dust explosion and the like is prevented;
(4) unloading is automatic, and the whole system is stopped in time when the unloading fails;
(5) the safety integrity needs to be considered, a safety system is formed by pressure detection, temperature detection, spark detection, explosion suppression measures, waterfall measures, fault detection and the like, and the safety of the system is guaranteed in an all-round manner.
Therefore, on the basis of the above content, the present invention further comprises an explosion venting unit, which comprises a flameless waterfall device 6 arranged on the pressure type spray dryer 1 and a waterfall plate 14 arranged on the bag-type dust collector 3. The flameless waterfall discharging device 6 is used for discharging the dust explosion of the pressure type spray dryer 1, and the waterfall discharging plate 14 is used for discharging the dust explosion of the bag type dust collector 3.
In a preferred embodiment, the automatic control unit controls whether the first chemical explosion-proof device 8 or the second chemical explosion-proof device 10 is started or not according to a state signal of the explosion venting unit. The flameless waterfall leakage device 16 and the waterfall leakage plate 14 are provided with status signals, when the flameless waterfall leakage device runs, the automatic control unit starts the first chemical explosion-proof device 8 and/or the second chemical explosion-proof device 10 according to the received status signals of the flameless waterfall leakage device 6 or the waterfall leakage plate 14, and the whole drying and dust removal system is safely interlocked and shut down.
In a specific implementation mode, the automatic control unit controls whether the system is in safety interlocking and stops according to the state signal of the explosion-proof unit. The first chemical explosion-proof device 8, the second chemical explosion-proof device 10, the one-way passive explosion-proof valve 4 and the two-way passive explosion-proof valve 13 are provided with state signals, and when the drying and dust removing system runs, the automatic control unit safely interlocks and stops the whole drying and dust removing system according to the received state signals of the operation of the explosion-proof unit.
In a preferred embodiment, the autonomous unit further comprises a first discharge rotary valve 7 at the bottom of the pressure type spray dryer 1, a second discharge rotary valve 9 at the bottom of the cyclone 2 and a third discharge rotary valve 15 at the bottom of the bag-type dust collector 3; the automatic control unit carries out safety interlocking and shutdown on the whole drying and dust removing system according to the state signals of the first discharging rotary valve 7, the second discharging rotary valve 9 and the third discharging rotary valve 15, and when the discharging rotary valves are in fault, the automatic control unit receives the state signals of the faults of the discharging rotary valves.
In a preferred embodiment, the cyclone separator 2 and the bag house 3 are arranged in an outdoor area.
In a preferred embodiment, the supply line 17 of the pressure spray dryer 1 is provided with a switching valve 5. It can be used to automatically and/or manually shut off the material feed when the system fails.
In a preferred embodiment, the first chemical explosion-proof device 8 and the second chemical explosion-proof device 10 comprise a spark detector, a pressure transmitter and a chemical explosion-proof bottle. Because the materials in the spray drying exhaust pipeline 18 and the cyclone separator exhaust pipeline 19 have certain dust content, if a mechanical explosion-proof device is adopted, the dust easily causes the mechanical explosion-proof device not to work normally.
In the above technical solution, preferably, each operation is preset in the autonomous system, and all operation processes are manually started.
The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.
Example 1
The embodiment provides a spray drying and dust removing method for bulk drugs, which is applied to a bulk drug spray drying and dust removing explosion-proof system and comprises the following steps:
s1: a starting procedure: presetting each operation in an automatic control unit, leading hot air to enter a pressure type spray dryer 1 in the system from a hot air pipeline 16, and leading the dedusted waste gas to enter a subsequent induced draft fan through a bag type deduster waste gas pipeline 20;
s2: working procedures are as follows: the material enters a pressure type spray dryer 1 in the system from a material pipeline 17, the material and hot air are mixed in parallel flow in the pressure type spray dryer 1, atomization is carried out under the action of the hot air, drying is carried out, and the dried material is collected through a first discharge rotary valve 7 at the bottom of the pressure type spray dryer 1;
s3: primary dust removal process: the waste gas in the spray dryer 1 enters the cyclone separator 2 through a spray drying waste gas pipeline 18; the waste gas is subjected to primary dust removal in the cyclone separator (2), and ash obtained by the primary dust removal is collected through a second discharge rotary valve (9) at the bottom of the cyclone separator (2); the waste gas after primary dust removal enters the bag type dust collector 3 through the cyclone waste gas pipeline 19 for secondary dust removal, ash obtained by secondary dust removal is collected through the third discharging rotary valve 15 at the bottom of the bag type dust collector (3), and the waste gas after secondary dust removal is introduced into the bag type dust collector waste gas pipeline 20, enters a subsequent induced draft fan and is safely discharged.
Example 2
The embodiment provides a dust explosion-proof system applied to the spray drying and dust removing method of the bulk drug in the embodiment 1, which comprises a pressure type spray dryer 1, a cyclone separator 2 and a bag type dust remover 3, which are connected with a cyclone separator waste gas pipeline 19 through a spray drying waste gas pipeline 18 in sequence; also comprises
A explosion venting unit:
a1: the pressure type spray dryer 1 is provided with a flameless waterfall discharging device 6 for discharging dust explosion of the pressure type spray dryer 1;
a2: the bag-type dust collector 3 is provided with a waterfall board 14 for the dust explosion of the bag-type dust collector 3 to discharge;
a3: the flameless waterfall leakage device 6 and the waterfall leakage plate 14 are provided with status signals, and when the flameless waterfall leakage device runs, the first chemical explosion-proof device 8 or the second chemical explosion-proof device 10 is started, and the whole system is safely interlocked and shut down.
And the explosion-proof unit controls the influence range of dust combustion and explosion:
b1: the hot air pipeline 16 is provided with a one-way passive explosion-proof valve 4 for preventing dust explosion in the pressure type spray dryer 1 from spreading to an air source;
b2: the spray drying waste gas pipeline 18 is provided with a first chemical explosion-proof device 8 for preventing dust explosion in the pressure type spray dryer 1 from spreading to the cyclone separator 2;
b3: the cyclone separator waste gas pipeline 19 is provided with a second chemical explosion-proof device 10 for preventing dust explosion in the bag type dust collector 3 from spreading to the cyclone separator 2;
b4: the bag type dust collector waste gas pipeline 20 is provided with a bidirectional passive explosion-proof valve 13 for isolating dust explosion between the spray drying dust removal system and a subsequent induced draft fan;
b5: when the first chemical explosion-proof device 8 and/or the second chemical explosion-proof device 10 are/is provided with the state signals, the whole drying and dust removing system is safely interlocked and shut down when in operation;
b6: the first chemical explosion-proof device 8 and the second chemical explosion-proof device 10 comprise spark detectors, pressure transmitters and chemical explosion suppression bottles, when the abnormality is detected, the first chemical explosion-proof device 8 and/or the second chemical explosion-proof device 10 operate, and the whole drying and dust removing system is safely interlocked and shut down;
b7: the one-way passive explosion-proof valve 4 and the two-way passive explosion-proof valve 13 are provided with state signals, and when the system runs, the whole drying and dust removing system is safely interlocked and stopped;
c, a self-control unit, which controls whether to carry out safety interlocking and stop the machine according to the detected pressure value and temperature value:
c1: the pressure type spray dryer 1 is provided with a pressure transmitter 21 and a first temperature transmitter 22, and if the set temperature or pressure of the pressure type spray dryer 1 exceeds a preset range, the feeding temperature and pressure of hot air are interlockingly adjusted;
c2: a second temperature transmitter 11 is arranged on the waste gas pipeline 19 of the cyclone separator, and when the temperature exceeds a set value, a second chemical explosion-proof device 10 is operated;
c3: differential pressure transmitters 12 are arranged on the cyclone separator waste gas pipeline 19 and the bag type dust collector waste gas pipeline 20, when the pressure change of the inlet and the outlet of the bag type dust collector 3 is larger than an allowable value, an audible and visual alarm signal is sent out, and the whole system drying and dust removing system is safely interlocked and stopped;
c4: the bottom of the pressure type spray dryer 1 is provided with a first discharging rotary valve 7, the bottom of the cyclone separator 2 is provided with a second discharging rotary valve 9, the bottom of the bag type dust collector 3 is provided with a third discharging rotary valve 15, the third discharging rotary valve is used for automatically discharging, and when the discharging rotary valves are in failure, the whole drying and dust removing system is safely interlocked and stopped.
Example 3
A certain pharmaceutical factory is mainly used for drying raw material medicines, the treatment capacity in a batch of production is 200kg/h, and a spray dryer, a cyclone separator and a bag type dust collector are adopted. According to the dust explosion prevention system for the spray drying and dust removing equipment and the operation flow thereof provided in example 1, the following data were obtained:
the operation time is as follows: continuous
Setting personnel at a workshop section: the number of operators was 1.
In the operation process, the material is automatically fed and discharged, when pressure abnormity and sparks occur in the spray dryer, the material is timely and safely discharged, and dangers are not spread to other equipment.
Example 4
A certain pharmaceutical factory is mainly used for drying raw material medicines, the treatment capacity in a batch of production is 200kg/h, and a spray dryer, a cyclone separator and a bag type dust collector are adopted. According to the dust explosion prevention system for the spray drying and dust removing equipment and the operation flow thereof provided in example 1, the following data were obtained:
the operation time is as follows: continuous
Setting personnel at a workshop section: the number of operators was 1.
In the operation process, the material business turn over is automatic, and when bag collector pressure was unusual, can in time shut down and change the filter bag, when the temperature was unusual, in time isolated bag collector and other systems, avoided danger to enlarge.
Comparative example 1
A certain pharmaceutical factory is mainly used for drying raw material medicines, the treatment capacity in a batch of production is 200kg/h, and a spray dryer, a cyclone separator and a bag type dust collector are adopted. With traditional security measures, the following data are obtained:
the operation time is as follows: continuous
In the operation process, the material inlet and outlet are automated, but when the pressure in the spray dryer is abnormal, the pressure is not released in time due to the fact that the waterfall discharging device and the explosion-proof device are not installed, the pressure is transmitted to the bag type dust collector, finally, the waterfall is discharged through the waterfall discharging plate on the bag type dust collector, and the whole system is placed in a dangerous state.
Comparative example 2
A certain pharmaceutical factory is mainly used for drying raw material medicines, the treatment capacity in a batch of production is 300kg/h, and a spray dryer, a cyclone separator and a bag type dust collector are adopted. With traditional security measures, the following data are obtained:
the operation time is as follows: continuous
In the operation process, the material is automatically fed and discharged, and when the inlet and outlet pressure and the inlet temperature of the bag type dust collector are abnormal, the abnormal pressure and the abnormal inlet temperature are not found in time, so that the waterfall board is frequently opened, and the normal operation is influenced.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.
Claims (10)
1. A spray drying and dust removing method for bulk drugs is applied to a spray drying and dust removing explosion-proof system for the bulk drugs, and is characterized by comprising the following steps:
s1: a starting procedure: hot air enters the spray drying and dust removal explosion-proof system of the bulk drugs through a hot air pipeline (16), and the waste gas after dust removal enters a subsequent induced draft fan through a waste gas pipeline (20) of the bag type dust remover;
s2: working procedures are as follows: the method comprises the following steps that materials enter a system from a material pipeline (17), are subjected to atomization drying in a pressure type spray dryer (1) under the action of hot air, and are collected through a first discharging rotary valve (7) at the bottom of the pressure type spray dryer (1) to obtain dried materials;
s3: a dust removal process: and waste gas in the pressure type spray dryer (1) is sequentially introduced into the cyclone separator (2) and the bag type dust collector (3) for primary dust removal and secondary dust removal, and the waste gas after dust removal is introduced into the waste gas pipeline (20) of the bag type dust collector.
2. The bulk drug spray drying and dedusting method according to claim 1, wherein the ash obtained by primary dedusting is collected by a second rotary unloading valve (9) at the bottom of the cyclone separator (2); and collecting the ash obtained by secondary dust removal through a third discharging rotary valve (15) at the bottom of the bag type dust collector (3).
3. A dust explosion-proof system applied to the spray drying and dust removing method of the bulk drug of any one of claims 1-2, which is characterized by comprising a pressure type spray dryer (1), a cyclone separator (2) and a bag type dust remover (3), which are connected with each other through a spray drying waste gas pipeline (18) and a cyclone separator waste gas pipeline (19) in sequence; also comprises
The explosion-proof unit controls the influence range of dust combustion and explosion, and comprises a one-way passive explosion-proof valve (4) arranged on a hot air pipeline (16) in the pressure type spray dryer (1), a first chemical explosion-proof device (8) arranged on a spray drying waste gas pipeline (18), a second chemical explosion-proof device (10) arranged on a cyclone separator waste gas pipeline (19) and a two-way passive explosion-proof valve (13) arranged on a bag type dust collector waste gas pipeline (20); and the automatic control unit controls whether to interlock safely and stop according to the detected pressure value and temperature value, and comprises a pressure transmitter (21) and a first temperature transmitter (22) which are arranged on the pressure type spray dryer (1), a second temperature transmitter (11) and a pressure difference transmitter (12) which are arranged on the cyclone waste gas pipeline (19) and the bag type dust collector waste gas pipeline (20).
4. A dust explosion protection system for a spray drying and dust removal apparatus as claimed in claim 3, further comprising an explosion venting unit, said explosion venting unit comprising a flameless waterfall venting means (6) provided on said pressure type spray dryer (1) and a waterfall plate (14) provided on said bag house (3).
5. The dust explosion protection system for spray drying and dust removal equipment according to claim 3, wherein the automatic control unit controls whether the first chemical explosion protection device (8) or the second chemical explosion protection device (10) is turned on or not according to a state signal of the explosion venting unit.
6. The dust explosion prevention system for the spray drying and dust removing device according to claim 3, wherein the automatic control unit controls whether the system is safely interlocked and shut down according to the state signal of the explosion suppression unit.
7. A dust explosion protection system for a spray drying and dust removal device according to claim 3, wherein the autonomous unit further comprises the first rotary discharge valve (7), the second rotary discharge valve (9) and a third rotary discharge valve (15); and the automatic control unit controls whether the system is safely interlocked and stopped according to the state signals of the first discharging rotary valve (7), the second discharging rotary valve (9) and the third discharging rotary valve (15).
8. A dust explosion protection system for a spray drying and dust collecting device according to claim 3, wherein the cyclone (2) and the bag house (3) are arranged in an outdoor area.
9. A dust explosion protection system for a spray drying and dust removal apparatus according to claim 3, wherein a switching valve (5) is provided on a material pipe (17) of the pressure type spray dryer (1).
10. The dust explosion protection system for spray drying and dust removal equipment of claim 1, wherein the first chemical explosion protection device (8) and the second chemical explosion protection device (10) comprise a spark detector, a pressure transmitter and a chemical explosion protection bottle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443120.4A CN111569452A (en) | 2020-05-22 | 2020-05-22 | Spray drying and dust removing method for bulk drug and dust explosion-proof system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010443120.4A CN111569452A (en) | 2020-05-22 | 2020-05-22 | Spray drying and dust removing method for bulk drug and dust explosion-proof system thereof |
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| CN111569452A true CN111569452A (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010443120.4A Pending CN111569452A (en) | 2020-05-22 | 2020-05-22 | Spray drying and dust removing method for bulk drug and dust explosion-proof system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201926251U (en) * | 2010-09-26 | 2011-08-10 | 常州力马干燥工程有限公司 | Closed cycle spray-drying and solvent-recovery device |
| CN108970261A (en) * | 2018-08-02 | 2018-12-11 | 东北大学 | A kind of explosion-proof type deduster |
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2020
- 2020-05-22 CN CN202010443120.4A patent/CN111569452A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201926251U (en) * | 2010-09-26 | 2011-08-10 | 常州力马干燥工程有限公司 | Closed cycle spray-drying and solvent-recovery device |
| CN108970261A (en) * | 2018-08-02 | 2018-12-11 | 东北大学 | A kind of explosion-proof type deduster |
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Application publication date: 20200825 |