CN211475969U - Energy-saving emission-reducing system for gravure organic waste gas - Google Patents
Energy-saving emission-reducing system for gravure organic waste gas Download PDFInfo
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- CN211475969U CN211475969U CN201921277990.8U CN201921277990U CN211475969U CN 211475969 U CN211475969 U CN 211475969U CN 201921277990 U CN201921277990 U CN 201921277990U CN 211475969 U CN211475969 U CN 211475969U
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Abstract
The utility model discloses an energy-saving and emission-reducing system for gravure organic waste gas, which comprises an outer passage, wherein the outer passage is introduced with organic waste gas, and a high-temperature furnace is arranged inside the outer passage; the inner passage is arranged inside the outer passage and communicated with the high-temperature furnace; the gravure equipment comprises an oven and an ink tank; the drying oven is characterized in that an air suction cover is arranged above the drying oven and positioned below the printing film, and hot air for drying the printing film is collected by the air suction cover before being emitted and is introduced into the drying oven to form a first hot air circulation; the organic waste gas sequentially passes through an air outlet, a preheating passage, a slow flow passage, an air return heat preservation passage and an air inlet of the gravure equipment, and forms internal circulation in the production area to form second hot air circulation; the heat source flows in the inner passage and can be discharged to the outside. The utility model discloses solved emission reduction, energy-conservation and safe tripartite problem systematically, produced good economic benefits and social.
Description
Technical Field
The utility model relates to a gravure organic waste gas's processing field, in particular to gravure organic waste gas's energy saving and emission reduction system.
Background
The packaging and printing industry generates a large amount of organic waste gases, which mainly include VOCs. At present, the domestic main VOCs treatment is divided into source control, process management and terminal treatment. The main technology for controlling the source is to use water-based ink; the process management mainly comprises the steps of finely managing the printing process and reducing the generation of VOCs; the end treatment mainly comprises recovery and elimination. For example: the active carbon and the UV are photolyzed, the waste gas enters an active carbon/UV photolysis device to be treated, and then is directly discharged into the atmosphere, only one function of emission reduction is completed, and the technology belongs to a single point position, namely the point technology.
At present, with the popularization of heat release technologies in the treatment processes of heat storage oxidation, catalytic combustion and the like, the design of recycling heat released in the treatment process while reducing emission is more and more favored, and two functions of emission reduction and energy conservation are completed, wherein two functions are combined into one line, and the technology can be called as a line technology. In current line technique, when handling the gravure waste gas of low concentration, big amount of wind, must concentrate earlier, then carry out direct combustion with the organic waste gas of high concentration in a limited high temperature space, waste gas and heat source are on same route, and is the same with "some technique" moreover, and the gas after the processing directly discharges the atmosphere to two safety problems appear easily: the possibility of explosion and unstable treatment performance of high-concentration organic waste gas at high temperature and in a limited space bring about the possibility of exceeding the emission standard.
For example, in comparison with document 1: li hui, huang yan peng, huang cao ji, equipment for treating VOCs process waste gas in packaging and printing industry: guangdong, CN107774093A [ P ]].2018-03-09. Containing VOCSThe waste gas enters the adsorption device from the gas collecting main pipe and the treated waste gasGas is discharged through a purification emptying pipeline; when the adsorption is saturated, the system enters a desorption period, the adsorbed VOCs are desorbed by hot air, and the concentrated VOCs gas obtained by desorption is sent to the first heat exchanger through the desorption induced draft tube for preheating and then transferred to the oxidation chamber for oxidation. And part of the emptied purified gas is heated by the second heat exchanger and transferred into the adsorption box through the desorption hot air pipe for desorption, and the adsorbent saturated in adsorption is desorbed and regenerated. The combustion system is arranged on the left vertical surface of the oxidation chamber to provide heat energy for the oxidation chamber. In short, the reference 1 adopts an adsorption and desorption technique to concentrate the VOCs generated by the package printing, then stores heat and burns the VOCs with open fire to process the VOCs, and exchanges heat to recycle heat energy to achieve the purpose of energy conservation. But two security issues are easily presented: the possibility of explosion and unstable treatment performance of high-concentration organic waste gas at high temperature and in a limited space bring about the possibility of exceeding the emission standard. The technology of the utility model directly collects the existing low-concentration gravure organic waste gas, and the organic waste gas is separated from the open fire through the inside and outside division double-channel design of the tube in the tube, thereby greatly improving the safety of the technology; the treated gas is not directly discharged into the atmosphere, but circulates in a production area, so that the stability of the emission reduction effect is improved.
Comparison document 2: the zero discharge technology of VOCs in the Tabang printing industry is in the reason of meeting cold [ J ]. Zhou of China economy, 2017, (33) is 56-57. The method discloses an internationally advanced new technology-VOCs (volatile organic compounds) zero-emission, high-efficiency and energy-saving green intaglio printing press which can be widely applied to the printing industry, and although the VOCs problem is solved from the source, the method is large in investment and high in updating cost, and the popularization difficulty of the technology is serious considering the actual demands and the tiny profits of enterprises with multiple batches and small batches. The technology of the utility model is directly installed on the existing equipment of enterprises, and the production equipment is not required to be replaced; and the excellent energy-saving characteristic ensures the use process, namely the profit process, and the enterprise popularization difficulty is small.
Comparison document 3: jiahai Liang, Zhao Jun, Li Yu Pau, Hu shou Gen. Green energy saving technology of gravure industry [ J ]. Package academic, 2015, (02): 53-58. The energy-saving emission-reducing scheme is practical and feasible through the discussion of main related technologies such as energy conservation of a hot air drying system of the gravure printing machine, comprehensive treatment of printing organic waste gases (VOCs), recycling of waste heat of a main heat source of a gravure enterprise and the like. On the basis, the thermal combustion type oxidizer is further combined with a hot water two-stage lithium bromide unit, the problem that the thermal combustion type oxidizer is high in operation cost is solved, the cost of the gravure printing industry is reduced by 20-40%, but the thermal combustion type oxidizer needs to be improved and designed from multiple aspects, and is complex in structure, high in application difficulty and low in feasibility; but also belongs to the technology of emission reduction and energy conservation, has the characteristics of open flame combustion of high-concentration and high-pressure organic waste gas and direct discharge to the atmosphere after treatment, has higher hidden danger in safety and has deficiency in the stability of emission reduction effect.
In summary, although the research on VOCs related in domestic and foreign published documents is numerous, the research is mainly focused on emission reduction or energy conservation and emission reduction, and the problems of emission reduction, energy conservation and safety are rarely considered systematically. Moreover, the existing treatment technologies have the problems of high application difficulty, high manufacturing cost and operation cost, low economic benefit and the like, and are difficult to mobilize the enthusiasm of most domestic small and medium-sized enterprises for actively carrying out environmental treatment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an energy saving and emission reduction system of gravure organic waste gas is provided, not only solved emission reduction, energy-conservation and safe tripartite problem, it is with low costs moreover, can produce good economic benefits and social.
In order to achieve the technical effect, the utility model provides an energy saving and emission reduction system of gravure organic waste gas, include:
the device comprises an outer passage, a high-temperature furnace, a preheating passage, a slow flow passage and a return air heat preservation passage, wherein organic waste gas is introduced into the outer passage;
the inner passage is arranged inside the outer passage and communicated with the high-temperature furnace to be used as a heat source;
the gravure equipment comprises an oven and an ink tank, the preheating passage is communicated with the oven and the air outlet of the ink tank, and the return air heat-preserving passage is communicated with the air inlet of the oven;
the drying oven is characterized in that an air suction cover is arranged above the drying oven and positioned below the printing film, and hot air for drying the printing film is collected by the air suction cover before being emitted and is introduced into the drying oven to form a first hot air circulation;
the organic waste gas sequentially passes through an air outlet, a preheating passage, a slow flow passage, an air return heat preservation passage and an air inlet of the gravure equipment, and forms internal circulation in the production area to form second hot air circulation;
the heat source flows in the inner passage and can be discharged to the outside.
As an improvement of the scheme, after the hot air for drying the printing film is collected, 100% of the hot air is introduced into the drying oven through the first air pipe, and a first hot air circulation is formed.
As an improvement of the above scheme, an air outlet of the oven is further connected with an oven waste gas recovery pipeline and a waste gas exhaust fan, the waste gas exhaust fan is connected with a second air pipe, the second air pipe is connected with the preheating passage, and part of waste gas discharged by the oven sequentially passes through the waste gas exhaust fan, the second air pipe, the preheating passage, the slow flow passage and the return air heat preservation passage to enter the oven again, so that second hot air circulation is formed.
As an improvement of the scheme, the oven waste gas recovery pipeline is connected with a third air pipe, the third air pipe is connected with an air inlet of the oven, and part of waste gas discharged by the oven enters the oven again through the third air pipe to form third hot air circulation.
As an improvement of the scheme, the oven waste gas recovery pipeline is connected with a fourth air pipe through a waste gas exhaust fan, the fourth air pipe is connected with an air inlet of the oven, and part of waste gas discharged by the oven is introduced into the oven again through the waste gas exhaust fan and the fourth air pipe to form fourth hot air circulation.
As an improvement of the above scheme, at least one of the first air duct, the second air duct, the third air duct and the fourth air duct is provided with a pneumatic valve and/or a temperature controller.
As an improvement of the scheme, the air suction cover is provided with an air suction opening with adjustable size.
As an improvement of the above scheme, the air suction opening comprises an air suction opening body and expansion parts arranged at two ends of the air suction opening body, and the size of each expansion part is larger than that of the air suction opening body.
As an improvement of the above scheme, the high-temperature furnace is arranged in the slow flow passage, so that the organic waste gas contacts the wall surface of the inner passage in the slow flow passage to generate a catalytic oxidation reaction and a high-temperature oxidation reaction;
the temperature of the tube wall of the inner passage in the slow flow passage is 500-950 ℃, and the temperature of the tube wall of the inner passage close to the high-temperature furnace is 800-930 ℃;
the temperature of the pipe wall of the inner passage in the preheating passage is 100-500 ℃;
the pipe wall temperature of the inner passage in the return air heat-preservation passage is 100-500 ℃.
Implement the utility model discloses following beneficial effect has:
the utility model discloses an outer passageway and interior passageway are a tubular construction in pipe, and organic waste gas passes through in proper order the air outlet of gravure equipment, preheat the income wind gap of passageway, slow flow passageway, return air heat preservation passageway, gravure equipment constitute the inner loop in the production area, form second heated air circulation, wherein, organic waste gas takes place catalytic oxidation reaction and high temperature oxidation reaction through the pipe wall surface of the interior passageway in the contact slow flow passageway, has comprehensively solved the emission reduction, energy-conservation and the safe tripartite problem of gravure organic waste gas, and is with low costs moreover, can produce good economic benefits and social.
On the basis of outer route and interior route, the utility model discloses be equipped with first heated air circulation, the cover that induced drafts is located the below of printing film, and the cover that induced drafts carries out the full cladding with the hot-blast of drying the printing film to just realize collecting before giving off, then 100% lets in the oven, forms first heated air circulation, both can thoroughly reduce discharging the environment wind in workshop, avoids the pollution of environment wind to the workshop, also can guarantee the hot air flow of oven. In addition, the surface of the printing film can be immediately subjected to effective temperature reduction, and the printing quality is improved.
And the first heated air circulation is supplemented with a third heated air circulation and a fourth heated air circulation at the same time, part of the waste gas discharged by the oven enters the oven again through the third heated air circulation and the fourth heated air circulation so as to maintain the air volume of the oven, and the temperature of the hot air entering the oven is regulated, so that the discharged hot air is reused, the oven basically does not need to use extra energy to maintain normal operation, and the energy is saved. Moreover, through a plurality of hot air circulations, the hot air flow of the external passage can be reduced, and finally, more energy conservation and emission reduction are realized.
Drawings
FIG. 1 is a schematic structural diagram of the energy saving and emission reduction system of the present invention;
FIG. 2 is a schematic structural diagram of a hot air circulating system of the energy saving and emission reduction system of the present invention;
FIG. 3 is a schematic diagram of a hot air circulation route of the energy saving and emission reduction system of the present invention;
fig. 4 is a schematic structural view of the suction hood.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.
As shown in fig. 1, the utility model provides an energy saving and emission reduction system of gravure organic waste gas, include:
the device comprises an outer passage 1, wherein organic waste gas is introduced into the outer passage 1, and a high-temperature furnace 3 is arranged inside the outer passage 1;
an inner passage 2, the inner passage 2 being provided inside the outer passage 1 and communicating with the high temperature furnace 3 as a heat source;
the outer passage 1 comprises a preheating passage 11, a slow flow passage 12 and a return air heat-insulation passage 13, the preheating passage 11, the slow flow passage 12 and the return air heat-insulation passage 13 are sequentially communicated, the preheating passage 11 is communicated with an air outlet of the gravure equipment 10, and the return air heat-insulation passage 13 is communicated with an air inlet of the gravure equipment 10;
the drying oven is characterized in that an air suction cover is arranged above the drying oven and positioned below the printing film, and hot air for drying the printing film is collected by the air suction cover before being emitted and is introduced into the drying oven to form a first hot air circulation;
the organic waste gas sequentially passes through an air outlet, a preheating passage, a slow flow passage, an air return heat preservation passage and an air inlet of the gravure equipment, and forms internal circulation in the production area to form second hot air circulation;
the heat source flows in the inner passage and can be discharged to the outside.
The utility model discloses a first heated air circulation and second heated air circulation not only can solve gravure equipment and produce organic waste gas, can also solve gravure equipment and produce free environment waste gas, have really solved emission reduction, energy-conservation and safe tripartite problem.
The second hot air circulation is first explained below:
the utility model discloses set up inside and outside divided dual channel and handled the organic waste gas that gravure equipment 10 discharged, gravure equipment 10 includes oven 20 and ink groove 30, oven 20 and ink groove 30's air outlet with it is linked together to preheat the route 11, oven 20's income wind gap with return air heat preservation route 13 is linked together. Organic waste gas collected by the oven 20 and the ink groove 30 enters the preheating channel 11 through air outlets of the oven 20 and the ink groove 30, the preheating channel 11 is communicated with the slow flow channel 12 through a main fan 4, the return air heat preservation channel 13 is communicated with an air inlet of the oven 20 through an air heater 5, and air outlets of the oven 20 and the ink groove 30 are communicated with the preheating channel 11 through a waste gas exhaust fan 6. The main blower 4, the hot air blower 5 and the exhaust gas suction blower 6 control the gas flow of the organic exhaust gas so that the internal circulation can be smoothly and stably performed. Preferably, the main fan 4 is a variable frequency fan, and regulates and controls the air volume and the air speed entering the slow flow passage 12.
Preferably, the air outlet of the oven 20 is further connected to an oven waste gas recovery pipeline 400 and a waste gas exhaust fan 6, the waste gas exhaust fan 6 is connected to a second air pipe 51, the second air pipe 51 is connected to the preheating passage 11, and a part of waste gas discharged by the oven sequentially passes through the waste gas exhaust fan 6, the second air pipe 51, the preheating passage 11, the slow flow passage 12 and the return air heat preservation passage 13, and then enters the oven 20 again to form a second hot air circulation (i.e., an internal circulation formed in the production area). The circulation route of the second hot wind circulation is referred to as the route of the outer path of fig. 1, and route B of fig. 3.
The utility model discloses inside and outside divided dual-channel has been set up, include: (1) inner path 2 taken as a heat source: the heat source is natural gas burnt by open fire, and the generated high-temperature airflow transmits heat to the airflow containing organic waste gas collected from the drying oven of the gravure equipment through the well-designed inner passage 2 and the corresponding preheating passage 11, slow flow passage 12 and return air heat-preserving passage 13; (2) outer path 1 for the flow of organic waste gas: the large-air-volume air flow carrying the organic waste gas is collected from an oven, an ink groove/a glue groove and the like of the gravure equipment, enters a preheating passage 11 for preheating, then enters a slow flow passage 12 for full catalytic oxidation reaction and high-temperature oxidation reaction, forms heat return air after being treated, passes through a return air heat preservation passage 13, and enters the oven again through an air inlet of the oven 20 for drying ink. Therefore, the utility model discloses from the actual production, handle gravure organic waste gas through the double-channel device, solved the problem of discharging reduction, energy-conservation and safe tripartite systematically, fundamentally solves from the produced organic waste gas emission of oven up to standard.
It should be noted that the gravure organic waste gas of the present invention refers to organic waste gas generated by gravure printing machine, compound machine and coating machine in gravure industry, which is organic waste gas generated by alcohol and ester solution, including but not limited to organic solvent and mixture commonly used in packaging and printing industry such as ethyl acetate, n-propyl acetate, n-butyl acetate, isopropanol and butanone.
It should also be noted that, the utility model relates to a tubular construction in pipe, outer route is as the outer tube, and interior route is as the inner tube, the centre of outer tube can be located to the inner tube, also can locate the bottom or be the side, no matter the size, shape and the position of outer tube and inner tube, it all belongs to the utility model discloses a protection scope.
Preferably, the high temperature furnace 3 is provided in the slow flow path 12 so that the organic exhaust gas contacts the high temperature tube wall surface of the inner path 2 in the slow flow path 12 to cause a catalytic oxidation reaction and a high temperature oxidation reaction. The utility model discloses be provided with unhurried current route 12, organic waste gas can reduce transmission rate in unhurried current route 12, perhaps prolongs transmission path for organic waste gas takes place abundant catalytic oxidation reaction and high temperature oxidation reaction with the high temperature pipe wall of inner path 2, and organic waste gas is decomposed completely.
As an embodiment of the slow flow passage, a partition 14 is provided in the slow flow passage 12, and the partition 14 divides the slow flow passage 12 into slow flow air passages. The baffle plate 14 can change the slow flow passage 12 into a plurality of parallel slow flow air passages, and the transmission path of the organic waste gas is prolonged, so that the aim of slow flow is fulfilled.
It should be noted that the slow flow passage 12 of the present invention can also have other implementation manners, for example, a baffle is provided, or an S-shaped or other curved slow flow air passage is provided, as long as it achieves the purpose of slow flow.
It should be further noted that the slow flow channel 12 of the present invention may also be a straight tube without obstacles, which may also realize sufficient catalytic oxidation reaction and high temperature oxidation reaction between the organic waste gas and the high temperature tube wall of the inner passage 2. In this case, if the purpose of the slow flow is to be achieved, the flow rate of the organic waste gas may be controlled, and the flow rate is not limited thereto.
The temperature of the tube wall of the inner passage 2 in the slow flow passage 12 is 500-950 ℃, and the temperature of the tube wall of the inner passage 2 close to the high temperature furnace 3 is 800-930 ℃. The organic waste gas and the high-temperature pipe wall of the inner passage 2 generate sufficient catalytic oxidation reaction and high-temperature oxidation reaction to generate harmless high-temperature gas.
The pipe wall temperature of the inner passage 2 in the preheating passage 11 is 100-500 ℃; the pipe wall temperature of the inner passage 2 in the return air heat-preservation passage 13 is 100-500 ℃. The heat generated by the natural gas combusted by open fire flows through drainage, and a part of the heat enters a preheating passage to preheat the collected VOCs airflow, wherein the preheating temperature is maintained at 100-500 ℃; one portion enters the return air heat preservation path to maintain the clean heat flow at the required temperature of the oven, about 100-. When the technology is used for treating the VOCs by the enterprises to reach the emission standard, the energy consumption is obviously reduced, the direct income increase of the enterprises is realized, the VOCs treatment is organically combined with the enterprise profit, and the problem of low operation rate in the prior art is fundamentally solved.
And, because the utility model discloses inside and outside two channel design of cutting apart, the inner passage can play the effect of generating heat for a long time, can keep from energy saving and emission reduction system to gravure equipment's transport hot-blast main's temperature stability, and this pipeline has the temperature about 50 meters on average to remain stable basically, is favorable to fully processing organic waste gas, realizes more thorough emission reduction.
Further, in order to realize the good connection of interior route and outer route to and the security of assurance system, the utility model discloses a plurality of fans, return pressure pipeline, check valve and tonifying qi fan have been set up.
The inner passage 2 comprises an inner passage main pipe 21 and a pressure return pipe 22, the pressure return pipe 22 is provided with a one-way pressure release valve 23, and the pressure return pipe 22 is communicated with the high-temperature furnace 3 through a natural gas fan 7. The treated organic waste gas may generate residual VOCSGas, back pressure pipe 22 will balance the VOCSThe gas is fed into the high temperature furnace 3 for combustion, which facilitates the combustion of natural gas and allows the removal of VOCs therein by the combustion processSGas, energy-saving effect and VOC reductionSAnd (5) discharging gas.
The inner passage 2 is provided with a first outlet 24, and a tail gas fan (not shown in the figure) is installed at the first outlet 24 so as to communicate the inner passage 2 with the outside. The high-temperature heat source carries out the heat exchange through interior route, becomes low temperature gas to discharge through first export and tail gas fan, enable the unobstructed nothing high pressure of air current, greatly reduced entire system the possibility of explosion appear.
The slow flow passage 12 is provided with an air supply fan (not shown in the figure) so that the slow flow passage 12 is communicated with the outside, the air flow is smooth without high pressure, the possibility of explosion of the whole system is greatly reduced, and the safety of internal circulation is ensured.
Secondly, the utility model discloses expound first heated air circulation, third heated air circulation and fourth heated air circulation again:
the oven 20 discharges hot air to form ambient air when drying the printed film, in addition to the organic waste gas normally discharged. In order to solve the environmental wind problem of printing process, decompose the free environmental waste gas of processing gravure equipment production, the utility model discloses be equipped with first heated air circulation, can refer to the heated air circulation system 100 that fig. 1, fig. 2 and fig. 3 are shown, specifically as follows:
an air suction cover 40 is arranged above the drying oven 20, the air suction cover 40 is located below the printing film, and hot air for drying the printing film is collected by the air suction cover 40 before being emitted and is introduced into the drying oven to form first hot air circulation. The circulation route of the first hot wind circulation is referred to as route a of fig. 3.
Preferably, after the hot air for drying the printed film is collected, 100% of the hot air is introduced into the oven 20 through the first air duct 41 to form a first hot air circulation, so that 100% of the hot air is recycled.
On the basis of outer route and interior route, the utility model discloses be equipped with first heated air circulation, and the cover that induced drafts is located the below of printing film, and the cover that induced drafts carries out full cladding with the hot-blast of drying the printing film to just realize collecting before giving off, then 100% lets in the oven, forms first heated air circulation, both can guarantee the hot air flowrate of oven, also can thoroughly reduce the environmental wind in reduction workshop, avoids the pollution of environmental wind to the workshop. In addition, the surface of the printing film can be immediately subjected to effective temperature reduction, and the printing quality is improved.
In order to maintain the air volume of the fan and achieve more ideal energy conservation and emission reduction, the oven exhaust gas recovery pipeline 400 is connected with a third air pipe 61, the third air pipe 61 is connected with an air inlet of the oven 20, and part of exhaust gas discharged by the oven enters the oven 20 again through the third air pipe 61 to form a third hot air circulation. The circulation route of the third hot wind circulation is shown in route C of fig. 3.
The oven waste gas recovery pipeline 400 is connected with a fourth air pipe 71 through a waste gas pumping fan 6, the fourth air pipe 71 is connected with an air inlet of the oven 20, and part of waste gas discharged by the oven is introduced into the oven again through the waste gas pumping fan 6 and the fourth air pipe 71 to form fourth hot air circulation. The circulation route of the fourth hot wind circulation is shown in route D of fig. 3.
The first heated air circulation is supplemented with a third heated air circulation and a fourth heated air circulation simultaneously, part of waste gas discharged by the oven enters the oven again through the third heated air circulation and the fourth heated air circulation to maintain the air volume of the oven, the temperature of hot air entering the oven is regulated, the discharged hot air is recycled, the oven basically does not need to use extra energy to maintain normal operation, and energy is saved. Moreover, through a plurality of hot air circulations, the hot air flow of the external passage can be reduced, and finally, more energy conservation and emission reduction are realized.
The utility model discloses a problem of the amount of wind is solved to first heated air circulation, second heated air circulation, third heated air circulation, fourth heated air circulation, through arranging four independent heated air circulation's operating condition, guarantees that the air output in the oven is greater than or equal to the intake, avoids producing the malleation for equipment work smoothly. Preferably, the utility model discloses a first heated air circulation, second heated air circulation, third heated air circulation, fourth heated air circulation guarantee that the volume of airing exhaust in the oven > the intake, produce the slight negative pressure.
In order to accurately control the flow of the hot air of the first hot air circulation, the second hot air circulation, the third hot air circulation and the fourth hot air circulation, at least one of the first air pipe, the second air pipe, the third air pipe and the fourth air pipe is provided with a pneumatic valve and/or a temperature controller. Preferably, the second air pipe 51 is provided with a full-automatic proportional hot air flow actuator 52 and a temperature controller 53, and the third air pipe 61 is provided with a one-way check valve 62 for preventing hot air from directly discharging the exhaust air pumping fan 6.
Referring to fig. 4, the suction hood 40 is provided with a suction opening 401 capable of adjusting the size.
The inlet scoop 401 includes inlet scoop body 401A and the expansion portion 401B who locates inlet scoop body 401A both ends, the size of expansion portion 401B is greater than inlet scoop body 401A's size.
The air suction cover is generally made of metal materials and has certain flexibility. The utility model discloses can change the angle of its slope through the sheetmetal of the inlet scoop body 401A department of buckling, realize the change of inlet scoop size, get into the amount of wind that changes the cover that induced drafts.
To sum up, the utility model discloses gravure organic waste gas's energy saving and emission reduction system's theory of operation as follows:
1. the utility model collects organic waste gas through the oven 20 and the ink groove 30, and the collected organic waste gas enters the preheating passage 11 for preheating through the air outlets of the oven 20 and the ink groove 30 under the action of the waste gas exhaust fan 6;
2. the preheated organic waste gas enters a slow flow passage 12 under the action of a main fan 4, a high-temperature furnace 3 is arranged in the slow flow passage 12, and the organic waste gas contacts the surface of the high-temperature pipe wall of an inner passage 2 in the slow flow passage 12 to generate catalytic oxidation reaction and high-temperature oxidation reaction to generate harmless high-temperature gas to form hot return air;
3. the hot return air flows through the return air heat preservation passage 13 and enters the oven again through the air inlet of the oven 20 under the action of the air heater 5 for drying the ink, so that the internal circulation of the VOCs production area without emission to the atmosphere, namely the second hot air circulation (route B), is formed.
4. When the temperature of the hot return air is higher than the temperature required by the oven, fresh air is sent to the oven 20 from the environment to be cooled, at the moment, as the pressure is increased, the one-way pressure release valve 23 is opened, redundant organic waste gas is pumped into the high-temperature furnace 3 through the natural gas fan 7 and is combusted along with natural gas, and the produced carbon dioxide and water are discharged to the atmosphere along with the combustion products of the natural gas and the first outlet 24.
5. The heat source is natural gas which is burnt by open fire in the high-temperature furnace 3, the generated high-temperature airflow conducts heat to VOCs-containing airflow outside the pipe through the inner passage 2, finally the high-temperature airflow is sent into a washing tower, a filtering tank and a trickling filter tower through a fan to be treated and then directly discharged into the atmosphere, and the inlet of the passage is a natural gas fan in the high-temperature furnace 3.
6. To environment wind, the utility model discloses a first heated air circulation (route A), the cover 40 that induced drafts is collected the hot-blast preceding of distributing of drying the printing film to utilize, 100% hot-blast lets in oven 20 through first tuber pipe 41 to carry out recycle with environment wind.
When the air volume provided by the first hot air circulation does not reach the requirement of the oven 20, or the temperature of the hot air in the oven 20 does not reach the standard, the third hot air circulation (route C) is started, part of the waste gas discharged by the oven enters the oven 20 again through the third air pipe 61, the effect of supplementing the air volume of the oven is achieved, and the temperature of the hot air in the oven 20 is adjusted.
When the air volume provided by the first hot air circulation and the third hot air circulation is less than the requirement of the oven, the fourth hot air circulation is started (route D), and part of the waste gas discharged by the oven is introduced into the oven again through the waste gas exhaust fan 6 and the fourth air pipe 71 to form the fourth hot air circulation.
To sum up, the utility model discloses has following advancement:
(one) the utility model relates to a pipe-in-pipe structure, it is through second heated air circulation, synthesizes and solves emission reduction, energy-conservation and safe tripartite problem, and three point one-tenth face is a "face technique" of emphasizing the system solution problem, specifically as follows:
1. more stable emission reduction: organic waste gas, namely VOCs-carrying airflow, circulates in a production area formed by an outer passage, the organic waste gas is not directly discharged to the atmosphere, only a small amount of organic waste gas enters the inner passage when pressure relief is needed, and the small amount of VOCs is basically treated in a long and sufficient natural gas flame and heat state; even if the high-temperature furnace occasionally works insufficiently, the insufficiently processed VOCs enter the next internal circulation along with the hot return air, so that the atmosphere is not polluted, the emission reduction effect is more stable, and good social benefits are formed.
2. More excellent energy conservation: the hot air flow treated by the high-temperature furnace can be introduced into the return air heat-preserving passage in percent and enters production equipment to participate in production, so that the production equipment can basically maintain normal operation without using electric energy or steam energy, and the total energy consumption of production is greatly reduced; in addition, the natural gas generated by the open flame combustion partially enters the preheating passage through drainage, the collected VOCs airflow is preheated, the efficiency of oxidation treatment of the high-temperature furnace is favorably ensured, and the treated gas is kept at the temperature required by the oven after partially entering the return air heat-preservation passage. Therefore, when the enterprise uses the technology to process VOCs to reach the emission standard, the production energy consumption is obviously reduced, a new profit growth point is formed, and good economic benefits can be obtained.
3. A more secure system: the slow flow passage is provided with an air supplementing fan communicated with the atmosphere and is matched with the first outlet of the inner passage, so that the high-temperature furnace is not over high in temperature, heat source airflow is smooth and free of high pressure, and the possibility of explosion of the inner passage is greatly reduced; the concentration of VOCs to be treated is low, the VOCs are difficult to directly burn, and the double-channel design with internal and external separation ensures that the VOCs do not contact open fire and are difficult to fire; the airflow carrying the VOCs is connected with the inner passage through the one-way pressure relief valve at the outer passage, so that the outer passage can be prevented from generating high pressure, and the safety of organic waste gas treatment is improved.
4. More convenient environmental protection supervision's system: not only the enterprise need use hot return air to reduce the energy consumption and obtain new profit growth point, if not operating moreover the utility model relates to a system, printing combined process can not start, consequently, the utility model discloses will handle VOCs and enterprise's profit and combine organically, install the utility model discloses afterwards, not only fundamentally has solved the difficult problem that prior art operating rate is low, can avoid current enterprise to escape environmental protection department's supervision and punishment's disorderly through shutting down moreover, has both solved in the past "detection personnel enter the factory, and the workshop is shut down and is dealt with" exhaust gas monitoring law enforcement difficult problem makes things convenient for environmental protection department to supervise the management again, has obvious social.
5. More widely used systems: the utility model discloses according to local conditions, it is little to take up an area of, can be under the condition that maintains original production technology, directly install on gravure enterprise's existing equipment. Moreover, relative to the most prevalent RTO/RCO technology of current, the utility model discloses whole investment cost is low, and the operation not only does not consume money but also can give birth to money, therefore the enterprise acceptance is higher, has fully solved emission reduction, energy-conservation and safe system problem among gravure enterprise's the organic waste gas treatment, and the marketing degree of difficulty is lower, and application prospect is wider.
(two) the utility model discloses an on second heated air circulation basis, be equipped with first heated air circulation and third heated air circulation and fourth heated air circulation, can thoroughly reduce discharging the environmental wind in workshop, avoid the pollution of environmental wind to the workshop to the realization discharges hot-blast reuse, can let the oven need not use extra energy to maintain normal operation, energy saving basically. Moreover, through a plurality of hot air circulations, the hot air flow of the external passage can be reduced, and finally, more energy conservation and emission reduction are realized.
The utility model discloses a pollution control effect as follows:
1. the total VOCs can be lower than 30mg/m3And the total VOCs in the period II meets the local standard DB44/815-2010 volatile organic compound emission standard of the printing industry of Guangdong province: standard maximum allowable discharge concentration 120mg/m3。
2. The organic waste gas treatment efficiency of a packaging and printing enterprise can reach 98%, and the pollution of environmental wind to workshops is effectively reduced.
3. The energy cost saving efficiency can reach 40-60%.
4. Treatment scale: installation the utility model discloses behind the energy saving and emission reduction system, 4 imprints and 4 do the production of working simultaneously of duplicator take the VOCs air current can be handled to a high temperature furnace.
The enterprise is using the utility model discloses when handling VOCs and reaching emission standard, energy cost is showing and is reducing, realizes that the enterprise directly increases receipts, will handle VOCs and enterprise's profit and organically combine, fundamentally has solved the difficult problem that prior art purification efficiency is low, running cost is high. And, the utility model discloses energy saving and emission reduction system's input construction cost is lower, according to the engineering scale of difference to based on current price of goods level, the cost is about 350 + 650 ten thousand/every set, is far less than current environmental treatment equipment.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. An energy-saving emission-reducing system for gravure organic waste gas is characterized by comprising:
the device comprises an outer passage, a high-temperature furnace, a preheating passage, a slow flow passage and a return air heat preservation passage, wherein organic waste gas is introduced into the outer passage;
the inner passage is arranged inside the outer passage and communicated with the high-temperature furnace to be used as a heat source;
the gravure equipment comprises an oven and an ink tank, the preheating passage is communicated with the oven and the air outlet of the ink tank, and the return air heat-preserving passage is communicated with the air inlet of the oven;
the drying oven is characterized in that an air suction cover is arranged above the drying oven and positioned below the printing film, and hot air for drying the printing film is collected by the air suction cover before being emitted and is introduced into the drying oven to form a first hot air circulation;
the organic waste gas sequentially passes through an air outlet, a preheating passage, a slow flow passage, an air return heat preservation passage and an air inlet of the gravure equipment, and forms internal circulation in the production area to form second hot air circulation;
the heat source flows in the inner passage and can be discharged to the outside.
2. The energy saving and emission reduction system for gravure organic waste gas as claimed in claim 1, wherein 100% of the hot air for drying the printing film is introduced into the oven through the first air duct after being collected, thereby forming the first hot air circulation.
3. The energy-saving emission-reducing system for gravure organic waste gas as claimed in claim 2, wherein the air outlet of the oven is further connected with an oven waste gas recovery pipeline and a waste gas exhaust fan, the waste gas exhaust fan is connected with a second air duct, the second air duct is connected with the preheating passage, and part of waste gas discharged by the oven sequentially passes through the waste gas exhaust fan, the second air duct, the preheating passage, the slow flow passage and the return air heat preservation passage to enter the oven again, so as to form a second hot air circulation.
4. The energy saving and emission reduction system for gravure organic waste gas as claimed in claim 3, wherein the oven waste gas recovery pipeline is connected with a third air pipe, the third air pipe is connected with an air inlet of the oven, and part of the waste gas discharged from the oven enters the oven again through the third air pipe to form a third hot air circulation.
5. The energy saving and emission reduction system for gravure organic waste gas as claimed in claim 4, wherein the oven waste gas recycling pipeline is connected with a fourth air pipe through a waste gas exhaust fan, the fourth air pipe is connected with an air inlet of the oven, and part of the waste gas discharged by the oven is introduced into the oven again through the waste gas exhaust fan and the fourth air pipe to form a fourth hot air circulation.
6. The energy saving and emission reduction system for gravure organic waste gas according to claim 5, wherein at least one of the first air duct, the second air duct, the third air duct, and the fourth air duct is provided with a pneumatic valve and/or a temperature controller.
7. The energy saving and emission reduction system for gravure organic waste gas as set forth in claim 1, wherein the suction hood is provided with a suction opening whose size can be adjusted.
8. The energy saving and emission reduction system for gravure organic exhaust gas according to claim 7, wherein the suction inlet includes a suction inlet body and expansion parts provided at both ends of the suction inlet body, and the size of the expansion parts is larger than that of the suction inlet body.
9. The energy saving and emission reduction system for gravure organic exhaust gas as set forth in claim 1, wherein the high temperature furnace is provided in the slow flow path so that the organic exhaust gas undergoes a catalytic oxidation reaction and a high temperature oxidation reaction by contacting a wall surface of the inner path in the slow flow path.
10. The energy saving and emission reduction system for gravure organic exhaust gas as claimed in claim 9, wherein the tube wall temperature of the inner passage in the slow flow passage is 500-950 ℃, and the tube wall temperature of the inner passage close to the high temperature furnace is 800-930 ℃;
the temperature of the pipe wall of the inner passage in the preheating passage is 100-500 ℃;
the pipe wall temperature of the inner passage in the return air heat-preservation passage is 100-500 ℃.
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| CN110500599A (en) * | 2019-08-07 | 2019-11-26 | 佛山市佳威节能环保设备有限公司 | A kind of energy-saving and emission-reduction system of gravure organic exhaust gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110500599A (en) * | 2019-08-07 | 2019-11-26 | 佛山市佳威节能环保设备有限公司 | A kind of energy-saving and emission-reduction system of gravure organic exhaust gas |
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