CN210362971U - System for drying printed matter and concentrating tail gas - Google Patents
System for drying printed matter and concentrating tail gas Download PDFInfo
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- CN210362971U CN210362971U CN201920794574.9U CN201920794574U CN210362971U CN 210362971 U CN210362971 U CN 210362971U CN 201920794574 U CN201920794574 U CN 201920794574U CN 210362971 U CN210362971 U CN 210362971U
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Abstract
The application discloses a system for drying printed matters and concentrating tail gas, which comprises a plurality of hot air circulating devices, a detection module, a waste gas recovery mechanism and a PLC (programmable logic controller); the hot air circulating device is used for drying the printed matter and concentrating tail gas generated during drying; the detection module is used for detecting the negative pressure in the oven and the concentration of the organic combustible gas in the hot air circulating device in real time; the waste gas recovery mechanism is used for recovering waste gas of the hot air circulating devices; the PLC is used for controlling the concentration of the organic combustible gas in the hot air circulating device within a preset range according to the negative pressure in the oven and the concentration of the organic combustible gas in the oven. This application passes through the full automatic operation of PLC control entire system, and the control accuracy is higher when using manpower sparingly, and is visual with the running state of system through human-computer interface, and concentrated organic combustible gas reduces to discharging outward, practices thrift the external processing cost who discharges waste gas, and waste gas circulation flows among the control heated air circulation device, reduces the new trend and gets into, reduces the energy consumption of heating new trend.
Description
Technical Field
The utility model relates to a printing technology field especially relates to a system for dry printed matter and concentrated tail gas.
Background
VOCs are volatile organic compounds with boiling points lower than 250 ℃, and have great harm to human health and ecological environment. The organic waste gas is effectively treated, so that the environmental pollution is avoided, the operation cost of enterprises is reduced, and the social benefit and the economic benefit are higher.
In the printing industry, a large amount of waste gas containing VOCS is discharged, and particularly in the process of color printing, since overprinting is performed, that is, after one color is printed, rapid drying is performed so as to print the next color. In existing presses, ambient air is typically drawn directly into the drying oven of the press, heated, and then exhausted. In recent years, some printing machines newly manufactured and installed are subjected to simple internal circulation to partially recycle heat, but the large air volume causes huge energy consumption during heating, the large air volume causes large scale of treatment equipment for tail gas treatment, and the operation cost is high. Meanwhile, part of the solvent inevitably volatilizes through the operation space during the printing process.
The traditional Chinese patent publication No. CN109045852A discloses a collecting system for printing and coating waste gas, which comprises a fresh air inlet system, a hot air drying system, a printing machine and a tail gas treatment system which are connected in sequence, wherein the tail gas treatment system and the hot air drying system are connected through a heat recycling system; the fresh air sucked from the fresh air inlet system enters the printing machine through the hot air drying system and brings out waste gas in the printing machine to the tail gas treatment system, the high-temperature waste gas treated by the tail gas treatment system exchanges heat through the heat recycling system, the gas after heat exchange is discharged, and the heat recycling system recycles the absorbed heat to the hot air drying system. The system can not fully automatically control tail gas emission, can not concentrate waste gas, is insufficient in treatment by a combustion mode due to low concentration of the waste gas during waste gas treatment, and is low in efficiency of drying printed matters.
Disclosure of Invention
The above-mentioned not enough to prior art, the utility model aims to solve the technical problem that a system of stoving printed matter and concentrated tail gas is proposed.
The utility model provides a technical scheme that its technical problem adopted is a system of stoving printed matter and concentrated tail gas, a serial communication port, include:
the hot air circulating device comprises a plurality of hot air circulating devices, wherein each hot air circulating device comprises an air inlet fan, an oven and a return air fan which are sequentially connected; the drying oven is used for baking the printed matter, the air inlet fan is used for absorbing fresh air to enter the drying oven, and the air return fan is used for absorbing waste gas containing organic combustible gas after the printed matter is baked in the drying oven; each hot air circulating device also comprises an air inlet door and an air return door;
the detection module is used for detecting the negative pressure in the oven and the concentration of the organic combustible gas in the hot air circulating device in real time;
the waste gas recovery mechanism is used for recovering waste gas of the hot air circulating devices and is provided with a plurality of exhaust pipelines respectively connected with the hot air circulating devices;
and the PLC is used for controlling the opening of the air inlet door and the air return door according to the negative pressure in the oven and the concentration of the organic combustible gas in the oven, so that the waste gas or the mixed gas of the waste gas and the fresh air in the hot air circulating device circularly flows in the hot air circulating device, and the concentration of the organic combustible gas in the hot air circulating device is within a preset range.
Preferably, the PLC controls the on-off of the exhaust pipeline and the hot air circulating device according to the concentration of the organic combustible gas in the oven.
Preferably, the PLC presets an organic combustible gas concentration critical value, the organic combustible gas concentration critical value is smaller than an organic combustible gas explosion concentration value, and before the concentration of the organic combustible gas in the heated air circulation device reaches the organic combustible gas concentration critical value, the PLC controls the heated air circulation device to enable the waste gas in the heated air circulation device to circularly flow in the heated air circulation device.
Preferably, when the concentration of the organic combustible gas in the heated air circulation device reaches the critical value of the concentration of the organic combustible gas, the PLC controls the exhaust pipeline to be communicated with the heated air circulation device, and then the waste gas in the heated air circulation device is exhausted to the waste gas recovery mechanism.
Preferably, the detection module comprises a negative pressure sensor for detecting the negative pressure in the oven and a concentration sensor for detecting the concentration of the organic combustible gas in the oven.
Preferably, the hot air circulation device further comprises at least one first connection pipe for returning the exhaust air exhausted from the oven to the oven.
Preferably, the first connecting pipe is provided with an air pumping port, and the concentration sensor detects the exhaust gas sampled by the air pumping port.
Preferably, the hot air circulating device further comprises at least one second connecting pipe, the second connecting pipe is communicated with the oven and the air return fan, and the air return fan absorbs waste gas in the oven through the second connecting pipe and returns the waste gas to the oven through the first connecting pipe.
Preferably, the heated air circulation device further comprises a first heating wire for heating fresh air, and the first heating wire is located at the connection position of the air inlet fan and the oven.
Preferably, the hot air circulating device further comprises a second heating wire for heating the hot air, and the second heating wire is positioned in the first connecting pipe.
This application passes through the full automatic operation of PLC control entire system, and the control accuracy is higher when using manpower sparingly, and is visual with the running state of system through human-computer interface, and concentrated organic combustible gas reduces to discharging outward, practices thrift the external processing cost who discharges waste gas, and waste gas circulation flows among the control heated air circulation device, reduces the new trend and gets into, reduces the energy consumption of heating new trend.
Drawings
FIG. 1 is a block diagram of a system for drying printed products and concentrating exhaust gas in an embodiment.
FIG. 2 is a schematic structural view of a hot air circulating apparatus in the embodiment.
Fig. 3 is a schematic structural diagram of another view of the hot air circulation device in the embodiment.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Referring to fig. 1 to 3, the present invention discloses a system for drying printed matters and concentrating tail gas, including a plurality of hot air circulation devices 100, a detection module 200, a waste gas recovery mechanism 400 and a PLC 300; the printed matter which is just printed is dried by the system, and organic combustible gas is generated when the printed matter is dried; the combustible gas is mixed with the wind newly introduced into the hot air circulating device 100 and becomes exhaust gas.
In order to avoid polluting the environment with the organic combustible gas generated by flood-baking printing, the system circulates the waste gas in the hot air circulation device 100 to concentrate the organic combustible gas, specifically, by continuously mixing the newly generated organic combustible gas, when the organic combustible gas in the waste gas reaches a preset concentration, the waste gas is discharged into the waste gas recovery mechanism 400; the organic combustible gas concentration through the concentration will be much higher than the organic combustible gas concentration that has not passed through the concentration, just so conveniently handle organic combustible gas, and concrete direct combustion organic combustible gas, the organic combustible gas of high concentration is more abundant than the organic combustible gas burning of low concentration, consequently, this system is through concentrated organic combustible gas, again with organic combustible gas centralized processing, to the pollution of environment when can significantly reduce the baked printed matter, organic combustible gas is VOCs in this embodiment.
In this embodiment, the concentration of the organic combustible gas in the heated air circulation device 100 can be detected in real time through the detection module 200, and then the specific flow direction of the exhaust gas in the heated air circulation device 100 is controlled through the PLC300 according to the real-time concentration of the organic combustible gas; that is, the PLC300 controls the exhaust gas to be circulated again in the heated air circulation device 100 according to the real-time concentration of the organic combustible gas, or to be discharged to the exhaust gas recovery mechanism 400.
In this embodiment, the plurality of heated air circulation devices 100 are all connected to the exhaust gas recovery mechanism 400, when the concentration of the organic combustible gas in each heated air circulation device 100 reaches a predetermined concentration, the exhaust gas in each heated air circulation device is discharged to the exhaust gas recovery mechanism 400, and the exhaust gas generated by baking the printed matter is centrally treated by the exhaust gas recovery mechanism 400, so that the efficiency of collecting the exhaust gas is improved, and the situation of insufficient treatment caused by separately treating the exhaust gas can be avoided.
The hot air circulating devices 100 are structurally specific as follows, and each hot air circulating device 100 comprises an air inlet fan 10, an oven 20 and an air return fan 30 which are sequentially connected; the drying oven 20 is used for baking printed matters, the air inlet fan 10 is used for absorbing fresh air to enter the drying oven 20, and the air return fan 30 is used for absorbing waste gas containing organic combustible gas after the printed matters are baked in the drying oven 20; each of the hot air circulating devices 100 further includes an air inlet door 40 and an air return door 50.
In this embodiment, the return air fan 30 absorbs the exhaust gas in the air circulation device 100, so that the exhaust gas in the hot air circulation device 100 circulates and flows, the return air fan 30 sucks the exhaust gas out of the oven 20 and discharges the exhaust gas into the oven 20, so that the exhaust gas circulates and flows, the circulated and flowing exhaust gas can be mixed with the newly generated organic combustible gas at an accelerated speed, the concentration of the organic combustible gas in the exhaust gas is increased, in the process of return air, the exhaust gas is heated by the second heating wire 70 before returning to the oven 20, so that the baking efficiency of baked printed matters can be improved, and the exhaust gas returns to the oven 20 through the return air door 50.
The air intake fan 10 sucks fresh air to enable the fresh air to enter the hot air circulating device 100, specifically, the fresh air is heated by the first heating wire 60, and the heated fresh air enters the oven 20 through the air intake door 40.
When the tail gas of the printed matter is concentrated, the opening degrees of the return air door 50 and the air inlet door 40 are controlled through the PLC300, the proportion of fresh air and return air (originally, waste gas in the hot air circulating device 100) is further controlled, the concentration of discharged gas is increased as much as possible on the premise that the printed matter is fully dried and the concentration in the oven does not reach the explosive concentration value of the organic combustible gas, and the total amount of the circulating gas is increased.
The detection module 200 is used for detecting the negative pressure in the oven 20 and the concentration of the organic combustible gas in the hot air circulating device 100 in real time; the PLC300 controls the exhaust gas to circulate in the heated air circulating apparatus 100 according to the negative pressure in the oven 20 and the concentration of the organic combustible gas.
Specifically, the PLC300 controls the opening of the air intake damper 40 and the air return damper 50 according to the negative pressure in the oven 20 and the concentration of the organic combustible gas in the oven 20, so that the waste gas or the mixed gas of the waste gas and the fresh air in the heated air circulation device 100 circularly flows in the heated air circulation device 100, and the concentration of the organic combustible gas in the heated air circulation device 100 is within a preset range.
In this embodiment, when concentrating the organic combustible gas, the concentration range of the organic combustible gas needs to be controlled; the concentration of the organic combustible gas is too high, which is likely to cause explosion, and if the concentration of the gas in the heated air circulation device 100 is too low, the purpose of concentrating the organic combustible gas and treating the organic combustible gas in a centralized manner cannot be achieved.
The PLC300 controls the on/off of the exhaust duct 410 and the heated air circulation device 100 according to the concentration of the organic combustible gas in the heated air circulation device 100.
Specifically, the PLC300 controls the hot air circulation device 100 to communicate with the exhaust gas recovery mechanism 400 when the concentration of the organic combustible gas in the hot air circulation device 100 is within a preset range, and generally, the PLC300 controls the exhaust gas to circulate in the hot air circulation device to increase the concentration of the organic combustible gas in the exhaust gas when the concentration of the combustible gas in the hot air circulation device 100 is not within the preset range.
The PLC300 presets an organic combustible gas concentration critical value, the organic combustible gas concentration critical value is smaller than an organic combustible gas explosion concentration value, before the concentration of the organic combustible gas in the heated air circulation device 100 reaches the organic combustible gas concentration critical value, the PLC300 controls the heated air circulation device 100 to enable the exhaust gas in the heated air circulation device 100 to circularly flow in the heated air circulation device 100, so as to improve the concentration of the organic combustible gas in the heated air circulation device 100.
The concentration critical value of the organic combustible gas preset by the PLC300 is within the preset range of the concentration of the organic combustible gas; the explosive concentration value of the organic combustible gas is higher than the preset range of the concentration of the organic combustible gas.
When the concentration of the organic combustible gas in the heated air circulation device 100 reaches the critical value of the concentration of the organic combustible gas, the PLC300 controls the exhaust duct 410 to be communicated with the heated air circulation device 100, and then the exhaust gas in the heated air circulation device 100 is discharged to the exhaust gas recovery mechanism 400.
Specifically, the heated air circulation device 100 is provided with an intake door electric actuator and a return door electric actuator, and the PLC300 controls the intake door electric actuator and the return door electric actuator to respectively drive the intake door 40 and the return door 50, so as to control the opening degrees of the intake door 40 and the return door 50, and further control the ratio of the intake air volume (fresh air volume) to the return air volume (waste gas in the heated air circulation device 100 at first).
In this embodiment, the heated air circulation device 100 is provided with an exhaust air door and an exhaust air door electric actuator, the PLC300 drives the exhaust air door by controlling the exhaust air door electric actuator, and controls the heated air circulation device 100 to communicate with the exhaust gas recovery mechanism 400, and specifically, when the concentration of the organic combustible gas in the heated air circulation device 100 reaches the critical value of the concentration of the organic combustible gas, the PLC300 controls the exhaust air door electric actuator to drive the exhaust air door to open, so that the heated air circulation device 100 communicates with the exhaust gas recovery mechanism 400, and the exhaust gas in the heated air circulation device 100 is discharged to the exhaust gas recovery mechanism 400.
Before the concentration of the organic combustible gas in the heated air circulation device 100 reaches the critical value of the concentration of the organic combustible gas, the exhaust air door is closed, that is, the internal space in the heated air circulation device 100 is not communicated with the waste gas recovery mechanism 400, and the return air fan 30 drives the waste gas to circularly flow in the heated air circulation device 100 and continuously mix with the newly generated organic combustible gas (the organic combustible gas is newly generated when the printed matter is baked), so as to improve the concentration of the organic combustible gas in the heated air circulation device 100.
The detection module 200 includes a negative pressure sensor 210 that detects a negative pressure in the oven 20 and a concentration sensor 220 that detects a concentration of the organic combustible gas in the oven 20.
The hot air circulation device 100 further includes at least one first connection pipe 80, the first connection pipe 80 is used for returning the exhaust air discharged from the oven 20 to the oven 20, and the first connection pipe 80 is communicated with the return air blower 30 and the oven 20.
Specifically, the exhaust duct 410 of the exhaust gas recovery mechanism 400 is connected to the first connection pipe 80.
The first connection pipe 80 is provided with an air suction port 81, and the concentration sensor 220 detects the exhaust gas sampled by the air suction port 81.
The hot air circulation device 100 further comprises at least one second connection pipe 90, the second connection pipe 90 is used for discharging waste gas in the oven 20 to the outside of the oven 20, the second connection pipe 90 is communicated with the oven 20 and the return air fan 30, the return air fan 30 sucks the waste gas in the oven 20 through the second connection pipe 90 and returns the waste gas to the oven 20 through the first connection pipe 80, if the intake air fan 10 is in an open state, the waste gas returns to the oven 20 to be mixed with fresh air, and meanwhile, the waste gas is mixed with newly generated organic combustible gas.
The heated air circulation device 100 further comprises a first heating wire 60 for heating fresh air, and the first heating wire 60 is located at a connection position of the air intake fan 10 and the oven 20.
By heating the fresh air, the fresh air has enough temperature before entering the oven 20, so that the drying efficiency of drying the printed matters can be improved.
The hot air circulating device 100 further includes a second heating wire 70 for heating hot air, the second heating wire 70 is located in the first connecting pipe 80, and in this embodiment, the exhaust gas returning to the oven 20 again is heated by the second heating wire 70, so as to improve the drying efficiency of the oven 20.
The hot air circulation device is further provided with a human-computer interface 500, the human-computer interface 500 can display the running states of the air inlet fans 10 and the air return fans 30, the human-computer interface 500 can also display the concentration of organic combustible gas in the hot air circulation device 100 and the negative pressure in the oven 20, and an operator can control the running of a system for drying printed matters and concentrating tail gas through the human-computer interface 500.
This application passes through the full automatic operation of PLC300 control entire system, and control accuracy is higher when using manpower sparingly, and is visual with the running state of system through human-computer interface 500, and concentrated organic combustible gas reduces and discharges outward, practices thrift the cost of treatment of externally discharging waste gas, and waste gas circulation flows in the control heated air circulation device 100, reduces the new trend and gets into, reduces the energy consumption of heating the new trend.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A system for drying printed matter and concentrating off-gas, comprising:
the hot air circulating device comprises a plurality of hot air circulating devices, wherein each hot air circulating device comprises an air inlet fan, an oven and a return air fan which are sequentially connected; the drying oven is used for baking the printed matter, the air inlet fan is used for absorbing fresh air to enter the drying oven, and the air return fan is used for absorbing waste gas containing organic combustible gas after the printed matter is baked in the drying oven; each hot air circulating device also comprises an air inlet door and an air return door;
the detection module is used for detecting the negative pressure in the oven and the concentration of the organic combustible gas in the hot air circulating device in real time;
the waste gas recovery mechanism is used for recovering waste gas of the hot air circulating devices and is provided with a plurality of exhaust pipelines respectively connected with the hot air circulating devices;
and the PLC is used for controlling the opening of the air inlet door and the air return door according to the negative pressure in the oven and the concentration of the organic combustible gas in the oven, so that the waste gas or the mixed gas of the waste gas and the fresh air in the hot air circulating device circularly flows in the hot air circulating device, and the concentration of the organic combustible gas in the hot air circulating device is within a preset range.
2. The system for drying printed matter and concentrating off-gas of claim 1, wherein: and the PLC controls the on-off of the exhaust pipeline and the hot air circulating device according to the concentration of the organic combustible gas in the oven.
3. The system for drying printed matter and concentrating off-gas of claim 2, wherein: the PLC presets an organic combustible gas concentration critical value, the organic combustible gas concentration critical value is smaller than an organic combustible gas explosion concentration value, and before the concentration of the organic combustible gas in the heated air circulation device reaches the organic combustible gas concentration critical value, the PLC controls the heated air circulation device to enable waste gas in the heated air circulation device to flow in a circulating mode in the heated air circulation device.
4. A system for drying printed matter and concentrating off-gas as claimed in claim 3, wherein: when the concentration of the organic combustible gas in the heated air circulation device reaches the critical value of the concentration of the organic combustible gas, the PLC controls the exhaust pipeline to be communicated with the heated air circulation device, and then the waste gas in the heated air circulation device is discharged into the waste gas recovery mechanism.
5. The system for drying printed matter and concentrating off-gas of claim 1, wherein: the detection module comprises a negative pressure sensor for detecting negative pressure in the oven and a concentration sensor for detecting the concentration of organic combustible gas in the oven.
6. The system for drying printed matter and concentrating off-gas of claim 1, wherein: the hot air circulation device also comprises at least one first connecting pipe, and the first connecting pipe is used for returning the exhaust air exhausted from the oven to the oven.
7. The system for drying printed matter and concentrating off-gas of claim 6, wherein: the first connecting pipe is provided with an air suction opening, and the concentration sensor detects waste gas sampled by the air suction opening.
8. The system for drying printed matter and concentrating off-gas of claim 6, wherein: the hot air circulating device further comprises at least one second connecting pipe, the second connecting pipe is communicated with the drying oven and the air return fan, the air return fan absorbs waste gas in the drying oven through the second connecting pipe and returns the waste gas to the drying oven through the first connecting pipe.
9. The system for drying printed matter and concentrating off-gas of claim 1, wherein: the hot air circulating device further comprises a first heating wire used for heating fresh air, and the first heating wire is located at the connection position of the air inlet fan and the drying oven.
10. The system for drying printed matter and concentrating off-gas of claim 6, wherein: the hot air circulating device further comprises a second heating wire for heating hot air, and the second heating wire is located in the first connecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920794574.9U CN210362971U (en) | 2019-05-29 | 2019-05-29 | System for drying printed matter and concentrating tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920794574.9U CN210362971U (en) | 2019-05-29 | 2019-05-29 | System for drying printed matter and concentrating tail gas |
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| CN210362971U true CN210362971U (en) | 2020-04-21 |
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| CN201920794574.9U Active CN210362971U (en) | 2019-05-29 | 2019-05-29 | System for drying printed matter and concentrating tail gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154521A (en) * | 2019-05-29 | 2019-08-23 | 宁波欣达印刷机器有限公司 | A kind of system dried printed matter and tail gas is concentrated |
| CN111744222A (en) * | 2020-06-23 | 2020-10-09 | 莫清翔 | Liquid ammonia evaporator for flue gas denitration |
-
2019
- 2019-05-29 CN CN201920794574.9U patent/CN210362971U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154521A (en) * | 2019-05-29 | 2019-08-23 | 宁波欣达印刷机器有限公司 | A kind of system dried printed matter and tail gas is concentrated |
| CN111744222A (en) * | 2020-06-23 | 2020-10-09 | 莫清翔 | Liquid ammonia evaporator for flue gas denitration |
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