CN111298537A - Potash fertilizer drying waste gas treatment process - Google Patents
Potash fertilizer drying waste gas treatment process Download PDFInfo
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- CN111298537A CN111298537A CN202010256868.3A CN202010256868A CN111298537A CN 111298537 A CN111298537 A CN 111298537A CN 202010256868 A CN202010256868 A CN 202010256868A CN 111298537 A CN111298537 A CN 111298537A
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- temperature
- valve
- bag
- waste gas
- ash
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- 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
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
-
- 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
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/448—Auxiliary equipment or operation thereof controlling filtration by temperature measuring
Abstract
The invention discloses a potash fertilizer drying waste gas treatment process, which comprises the following steps: dedusting and recycling, wherein waste gas enters the bag chambers through a porous plate of the ash hopper, filter bags are arranged in the bag chambers, the filter bags filter fine potassium chloride powder, the treated air enters the outlet flue from each bag chamber, and the purified gas is discharged to the atmosphere; the purified air is subjected to back blowing, the treated air still has temperature, the outlet flues are provided with back blowing fans and are connected to the tops of all the bag rooms through back blowing pipes, after the ash removal process of one bag room is finished, the next bag room starts ash removal, and so on, and the cycle is that all the bag rooms finish ash removal; the device comprises a processing chamber, an outlet flue, a main fan, a bypass valve, an accident smoke outlet, an inlet flue, a main fan, a PLC (programmable logic controller) frequency conversion control system and a temperature monitoring and processing system.
Description
Technical Field
The invention belongs to the field of dust remover equipment, and particularly relates to a potassium fertilizer drying waste gas treatment process.
Background
The potassium fertilizer dewatering and drying process is characterized by that the potassium chloride whose water content is up to 8-12% is passed through 2 gas rotary drying equipments whose diameter is 2.4X 18m, and dried at 550-800 deg.C to obtain the finished product potassium chloride whose water content is less than 2%, and the flue gas is passed through the draught fan and passed through the cyclone dust-removing and dust-falling chamber to be evacuated. When the waste gas is discharged out of the induced draft fan, a large amount of potassium chloride dust is carried out by the tail gas. The concentration exceeds 15000mg/m, although two-stage dust removal devices (a cyclone dust collector and a dust falling chamber) are adopted, partial particulate potassium chloride is still discharged along with tail gas, the processing air volume of the cyclone dust collector is about 20000m/h, and the dust removal efficiency is about 60 percent. The discharged waste gas drifts around with the wind, so that the surrounding white powder flies, the environment is directly polluted, and the national environmental protection requirement is not met; and simultaneously, potassium chloride dust is also discharged, so that a large amount of products are lost.
At present, a bag-type dust collector replaces a cyclone dust collector in the industry, and the following problems exist in the use process:
1. the filter bag of the bag-type dust collector is blocked after being used for a period of time, the potassium chloride powder is recovered by adopting a back blowing mode, and if the atmospheric air back blowing is adopted, a suction inlet of a back blowing fan is communicated with the atmosphere. At the moment, because the humidity of the waste gas after the potash fertilizer is dried is high, the temperature is high, and the waste gas is easy to generate condensation phenomenon when contacting with outdoor air, so that the bag pasting is caused;
2. when the drying efficiency of the high-temperature drying gas is not high, for example, when the drying efficiency is only 10%, the temperature of the waste gas is high, the content of potassium chloride powder is low, at this time, if the normal air intake is maintained, energy waste is easily caused, and more importantly, the filter bag is burnt out by the high-temperature waste gas at the temperature of over 250 ℃, so that the potassium fertilizer drying waste gas cannot be dedusted and recycled, air pollution is generated, and the filter bag needs to be frequently replaced;
3. when the temperature is higher, adopt at present to add the cold blast gate, introduce the lower gas of temperature in the atmosphere, mix cold, but the dewfall phenomenon appears easily in this kind of mode, causes the damage to equipment simultaneously.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a potash fertilizer drying waste gas treatment process to solve the problems of bag pasting and damage of a bag-type dust collector and energy waste during potash fertilizer waste gas treatment.
The invention adopts the following technical scheme: a potash fertilizer drying waste gas treatment process comprises the following steps:
dust removal and recovery, wherein waste gas containing potassium chloride enters a treatment chamber through an inlet flue, the cross-sectional area of the treatment chamber from outside to inside is continuously reduced, the treatment chamber is connected with each ash bucket through a butterfly valve, the waste gas enters a bag chamber through a porous plate of the ash bucket, a filter bag is arranged in the bag chamber, the filter bag filters fine potassium chloride powder, the treated air enters an outlet flue from each bag chamber, and the purified gas is discharged to the atmosphere;
the top of the bag chamber is provided with a back-blowing poppet valve, the dust remover works normally, when dust removal is carried out, the exhaust butterfly valve of each bag chamber is in an open state, the cylinder electromagnetic valve is in a power-off state, the back-blowing poppet valve is in a closed state, and the cylinder electromagnetic valve is also in a power-off state;
the purified air is reversely blown, the processed air still has temperature, the outlet flues are all provided with reverse blowers which are connected to the top parts of the bag chambers through reverse blowing pipes, the top parts of the bag chambers are provided with lifting valves, the lifting valves drive the air cylinders to lift and open and close by compressed air,
along with the filtering, the resistance loss of the dust remover becomes larger, and under the control of a timing or fixed-resistance dust removal mode, a dust remover differential pressure set value transmitted by a differential pressure transmitter can trigger to send a dust removal instruction to a bag chamber; when in ash removal, the exhaust butterfly valve cylinder is electrified for about 10 seconds, the delay is 5 seconds after receiving a limit signal of the limit switch, then the back-flushing butterfly valve cylinder electromagnetic valve is electrified, so that the back-flushing butterfly valve is opened, the lift valve is completely opened for about 10 seconds, the back-flushing butterfly valve cylinder is closed after the delay is 20 seconds, and the exhaust butterfly valve is opened after the delay is 10 seconds after the back-flushing butterfly valve is completely closed; the potassium chloride powder in the filter bag enters an ash bucket under the air pressure,
after the ash removal process of one bag chamber is finished, the ash removal of the next bag chamber is started, and the like, and the process that all bag chambers finish the ash removal is one period; the potassium chloride powder is injected at fixed time according to a time sequence circulation mode, the injection period is 10-30 minutes, the period is adjustable, the initial value is 15 minutes, the ash bucket ash discharging valve is started and stopped along with the equipment in an automatic operation mode, the ash bucket discharges ash to recover the potassium chloride powder,
temperature monitoring and processing, a bypass valve is arranged between the processing chamber and the outlet flue, the outlet flue is provided with an accident smoke outlet, a cold air valve is arranged at the air inlet of the dust remover and can be manually or automatically opened,
when the temperature of the flue gas entering the dust remover is higher than the protection temperature, the PLC controls the bypass valve to be opened, so that the high-temperature waste gas enters the accident smoke outlet through the outlet flue; when the temperature of the flue gas entering the dust remover is lower than the safe temperature, the bypass valve is closed;
the inlet flue is driven by a main fan to flow by waste gas, the main fan is controlled by adopting PLC frequency conversion, when the moisture of the materials is abnormal, the dryer stops feeding materials temporarily, then the dryer is basically in a working stop state, the flue gas temperature fed back by a temperature measuring point is higher than the protection temperature, at the moment, the linkage control is started, and the rotating speed of the main fan is reduced to 15 HZ; and when the temperature of the flue gas is lower than the safe temperature, the rotating speed of the main fan is recovered.
Furthermore, when the clean air is subjected to back blowing, the back blowing valve and the bypass valve are poppet valves and are provided with double-layer valve covers, and the sealing performance is improved.
Further, the protection temperature is 250 ℃ and the safety temperature is 180 ℃.
Furthermore, the back-blowing fan is provided with a start button and a stop button, and an automatic or manual switching knob is arranged, when the automatic mode is operated, the spiral conveyer is opened for the start button and the stop button 10 seconds before the back-blowing valve is opened, the automatic mode or the manual switching knob is interlocked with the ash bin level meter, the ash is discharged when the high material level is started, and the ash is discharged when the low material level is stopped.
Furthermore, temperature monitoring is realized through a temperature detector at the inlet of the inlet flue, the temperature detector is connected with a PLC unit, and the PLC unit is connected with a back flushing poppet valve and a main fan to control the opening and closing of the back flushing poppet valve and the main fan.
Furthermore, the bypass valve is built-in and is positioned in the dust remover, so that external corrosion caused by contact with corrosive gas is avoided.
The invention has the beneficial effects that:
1. the potash fertilizer drying waste gas treatment process solves the problems of efficiency reduction and temperature rise in the potash fertilizer drying process, and has the advantages of temperature monitoring, variable frequency control of the main fan, reduction of the rotating speed of the main fan and reduction of the flow of high-temperature waste gas when the temperature is too high, and opening of the bypass valve to quickly reduce the temperature of the waste gas and prevent damage to the filter bag;
2. the invention adopts a clean gas back blowing process, which is different from the traditional process of air back blowing and cold mixing by opening a cold air valve, the clean gas has temperature, and the dew condensation phenomenon can not occur when the clean gas contacts with a filter bag and residual high-temperature waste gas, and simultaneously, the poppet valve is adopted, the sealing effect is improved, and the opening and closing stability is improved.
Drawings
FIG. 1 is a schematic view of the equipment structure of the potassium fertilizer drying waste gas treatment process of the invention;
FIG. 2 is a schematic flow diagram of the potassium fertilizer drying waste gas treatment process of the present invention.
Detailed Description
The details of the present invention are described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, a potassium fertilizer drying waste gas treatment process comprises the following steps:
s1, dedusting and recycling, wherein waste gas containing potassium chloride enters a treatment chamber through an inlet flue, the cross sectional area of the treatment chamber from outside to inside is continuously reduced, the treatment chamber is connected with each ash bucket through a butterfly valve, the waste gas enters a bag chamber through a porous plate of the ash bucket, a filter bag is arranged in the bag chamber, the filter bag filters fine potassium chloride powder, the treated air enters the outlet flue from each bag chamber, and the purified gas is discharged to the atmosphere;
the top of the bag chamber is provided with a back-blowing poppet valve, the dust remover works normally, when dust removal is carried out, the exhaust butterfly valve of each bag chamber is in an open state, the cylinder electromagnetic valve is in a power-off state, the back-blowing poppet valve is in a closed state, and the cylinder electromagnetic valve is also in a power-off state;
s2, clean air is subjected to back blowing, the processed air still has temperature, back blowing fans are arranged on outlet flues and are connected to the tops of the bag chambers through back blowing pipes, lift valves are arranged on the tops of the bag chambers, the lift valves are driven by compressed air to drive cylinders to lift and open and close,
along with the filtering, the resistance loss of the dust remover becomes larger, and under the control of a timing or fixed-resistance dust removal mode, a dust remover differential pressure set value transmitted by a differential pressure transmitter can trigger to send a dust removal instruction to a bag chamber; when in ash removal, the exhaust butterfly valve cylinder is electrified for about 10 seconds, the delay is 5 seconds after receiving a limit signal of the limit switch, then the back-flushing butterfly valve cylinder electromagnetic valve is electrified, so that the back-flushing butterfly valve is opened, the lift valve is completely opened for about 10 seconds, the back-flushing butterfly valve cylinder is closed after the delay is 20 seconds, and the exhaust butterfly valve is opened after the delay is 10 seconds after the back-flushing butterfly valve is completely closed; the potassium chloride powder in the filter bag enters an ash bucket under the air pressure,
after the ash removal process of one bag chamber is finished, the ash removal of the next bag chamber is started, and the like, and the process that all bag chambers finish the ash removal is one period; the potassium chloride powder is injected at fixed time according to a time sequence circulation mode, the injection period is 10-30 minutes, the period is adjustable, the initial value is 15 minutes, the ash bucket ash discharging valve is started and stopped along with the equipment in an automatic operation mode, the ash bucket discharges ash to recover the potassium chloride powder,
s3, temperature monitoring and processing, wherein a bypass valve is arranged between the processing chamber and the outlet flue, the outlet flue is provided with an accident smoke outlet, an air inlet of the dust remover is provided with a cold air valve which can be manually or automatically opened,
when the temperature of the flue gas entering the dust remover is higher than the protection temperature, the PLC controls the bypass valve to be opened, so that the high-temperature waste gas enters the accident smoke outlet through the outlet flue; when the temperature of the flue gas entering the dust remover is lower than the safe temperature, the bypass valve is closed;
the inlet flue is driven by a main fan to flow waste gas, the main fan is controlled by adopting PLC frequency conversion, when the temperature of the flue gas is higher than the protection temperature, the drying efficiency is lower, and the rotating speed of the main fan is reduced; and when the temperature of the flue gas is lower than the safe temperature, the rotating speed of the main fan is recovered.
In practical application, S2, in the purified gas back flushing step, the back flushing valve and the bypass valve are lifting valves and are provided with double-layer valve covers, and the sealing performance is improved.
In practical application, S3, the protection temperature of the temperature monitoring and processing step is 250 ℃, and the safety temperature is 180 ℃.
In practical application, S2, the back-blowing fan in the step of back-blowing clean air is provided with a start-stop button, and the knob is automatically or manually switched, when the automatic mode runs, the spiral conveyor is opened for 10 seconds before the back-blowing valve is opened, and the start-stop button is arranged, the automatic mode of the knob is automatically or manually switched to be interlocked with the ash bin level gauge, ash is discharged when the high material level is started, and the low material level is stopped.
In practical application: and S3, temperature monitoring in the temperature monitoring and processing step is realized through a temperature detector at the inlet of the inlet flue, the temperature detector is connected with a PLC unit, and the PLC unit is connected with a lift valve, a doped air cooler and a main fan to control the lift valve, the doped air cooler and the main fan to be opened and closed.
In practical application, S3, the bypass valve in the temperature monitoring and processing step is built-in and is positioned in the dust remover, so that external corrosion contacting with corrosive gas is avoided.
In conclusion, the invention solves the problems of efficiency reduction and temperature rise in the process of drying the potash fertilizer, the frequency conversion control of the main fan is realized, the refrigeration valve and the bypass valve are arranged, the filter bag is effectively protected, and meanwhile, the phenomenon of condensation is avoided by adopting the back flushing of purified gas.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (6)
1. A potash fertilizer drying waste gas treatment process is characterized in that: the method comprises the following steps:
s1, dedusting and recycling, wherein waste gas containing potassium chloride enters a treatment chamber through an inlet flue, the cross sectional area of the treatment chamber from outside to inside is continuously reduced, the treatment chamber is connected with each ash bucket through a butterfly valve, the waste gas enters a bag chamber through a porous plate of the ash bucket, a filter bag is arranged in the bag chamber, the filter bag filters fine potassium chloride powder, the treated air enters the outlet flue from each bag chamber, and the purified gas is discharged to the atmosphere;
the top of the bag chamber is provided with a back-blowing poppet valve, the dust remover works normally, when dust removal is carried out, the exhaust butterfly valve of each bag chamber is in an open state, the cylinder electromagnetic valve is in a power-off state, the back-blowing poppet valve is in a closed state, and the cylinder electromagnetic valve is also in a power-off state;
s2, clean air is subjected to back blowing, the processed air still has temperature, back blowing fans are arranged on outlet flues and are connected to the tops of the bag chambers through back blowing pipes, lift valves are arranged on the tops of the bag chambers, the lift valves are driven by compressed air to drive cylinders to lift and open and close,
along with the filtering, the resistance loss of the dust remover becomes larger, and under the control of a timing or fixed-resistance dust removal mode, a dust remover differential pressure set value transmitted by a differential pressure transmitter can trigger to send a dust removal instruction to a bag chamber; when in ash removal, the exhaust butterfly valve cylinder is electrified for about 10 seconds, the delay is 5 seconds after receiving a limit signal of the limit switch, then the back-flushing butterfly valve cylinder electromagnetic valve is electrified, so that the back-flushing butterfly valve is opened, the lift valve is completely opened for about 10 seconds, the back-flushing butterfly valve cylinder is closed after the delay is 20 seconds, and the exhaust butterfly valve is opened after the delay is 10 seconds after the back-flushing butterfly valve is completely closed; the potassium chloride powder in the filter bag enters an ash bucket under the air pressure,
after the ash removal process of one bag chamber is finished, the ash removal of the next bag chamber is started, and the like, and the process that all bag chambers finish the ash removal is one period; the potassium chloride powder is injected at fixed time according to a time sequence circulation mode, the injection period is 10-30 minutes, the period is adjustable, the initial value is 15 minutes, the ash bucket ash discharging valve is started and stopped along with the equipment in an automatic operation mode, the ash bucket discharges ash to recover the potassium chloride powder,
s3, temperature monitoring and processing, wherein a bypass valve is arranged between the processing chamber and the outlet flue, the outlet flue is provided with an accident smoke outlet, an air inlet of the dust remover is provided with a cold air valve which can be manually or automatically opened,
when the temperature of the flue gas entering the dust remover is higher than the protection temperature, the PLC controls the bypass valve to be opened, so that the high-temperature waste gas enters the accident smoke outlet through the outlet flue; when the temperature of the flue gas entering the dust remover is lower than the safe temperature, the bypass valve is closed;
the inlet flue is driven by a main fan to flow by waste gas, when the moisture of the materials is abnormal, the dryer stops feeding materials temporarily, so that the dryer basically stops working, the flue gas temperature fed back by a temperature measuring point is higher than the protection temperature, at the moment, the linkage control is started, and the rotating speed of the main fan is reduced to 15 HZ; and when the temperature of the flue gas is lower than the safe temperature, the rotating speed of the main fan is recovered.
2. The potassium fertilizer drying waste gas treatment process according to claim 1, characterized in that: s2, in the purified gas back flushing step, the back flushing valve and the bypass valve are lifting valves and are provided with double-layer valve covers, and sealing performance is improved.
3. The potassium fertilizer drying waste gas treatment process according to claim 1 or 2, characterized in that: s3, the protection temperature of the temperature monitoring and processing step is 250 ℃, and the safety temperature is 180 ℃.
4. The potassium fertilizer drying waste gas treatment process according to claim 1, characterized in that: s2, a back-blowing fan of the purified gas back-blowing step is provided with a start-stop button, and a knob is automatically or manually switched, when the automatic mode is operated, the spiral conveyor is opened for 10 seconds before a back-blowing valve is opened, the start-stop button is arranged, the automatic mode of the knob is automatically or manually switched to be interlocked with an ash bin level meter, ash is discharged when the high material level is started, and the low material level is stopped.
5. The potassium fertilizer drying waste gas treatment process according to claim 3, characterized in that: and S3, temperature monitoring in the temperature monitoring and processing step is realized through a temperature detector at the inlet of the inlet flue, the temperature detector is connected with a PLC unit, and the PLC unit is connected with a lift valve, a doped air cooler and a main fan to control the lift valve, the doped air cooler and the main fan to be opened and closed.
6. The potassium fertilizer drying waste gas treatment process according to claim 1, characterized in that: and S3, the bypass valve in the temperature monitoring and processing step is built-in and is positioned in the dust remover, so that the external corrosion in contact with corrosive gas is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010256868.3A CN111298537A (en) | 2020-04-02 | 2020-04-02 | Potash fertilizer drying waste gas treatment process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010256868.3A CN111298537A (en) | 2020-04-02 | 2020-04-02 | Potash fertilizer drying waste gas treatment process |
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| CN111298537A true CN111298537A (en) | 2020-06-19 |
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Citations (5)
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|---|---|---|---|---|
| JP2004243292A (en) * | 2003-02-10 | 2004-09-02 | Hightech Square:Kk | Stainless steel wire net screen type separation apparatus |
| CN102107107A (en) * | 2011-01-11 | 2011-06-29 | 江苏南自通华环境工程有限公司 | Split-type pulse dust collector for drying and burning sludge |
| CN108379968A (en) * | 2018-03-12 | 2018-08-10 | 四川德胜集团钒钛有限公司 | A kind of control system and method for bag filter |
| CN209405860U (en) * | 2018-12-04 | 2019-09-20 | 源滤科技(杭州)有限公司 | A kind of deserted filter |
| CN110613988A (en) * | 2019-08-12 | 2019-12-27 | 华北电力大学（保定） | Dust bag dust remover capable of compressing high-temperature flue gas and purifying back-blowing ash |
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2020
- 2020-04-02 CN CN202010256868.3A patent/CN111298537A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| JP2004243292A (en) * | 2003-02-10 | 2004-09-02 | Hightech Square:Kk | Stainless steel wire net screen type separation apparatus |
| CN102107107A (en) * | 2011-01-11 | 2011-06-29 | 江苏南自通华环境工程有限公司 | Split-type pulse dust collector for drying and burning sludge |
| CN108379968A (en) * | 2018-03-12 | 2018-08-10 | 四川德胜集团钒钛有限公司 | A kind of control system and method for bag filter |
| CN209405860U (en) * | 2018-12-04 | 2019-09-20 | 源滤科技(杭州)有限公司 | A kind of deserted filter |
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Application publication date: 20200619 |