CN112393259A - Drying and waste gas treatment method in phenolic resin coating operation - Google Patents
Drying and waste gas treatment method in phenolic resin coating operation Download PDFInfo
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- CN112393259A CN112393259A CN202011270776.7A CN202011270776A CN112393259A CN 112393259 A CN112393259 A CN 112393259A CN 202011270776 A CN202011270776 A CN 202011270776A CN 112393259 A CN112393259 A CN 112393259A
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- gas
- drying
- waste gas
- phenolic resin
- resin coating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
Abstract
A drying and waste gas treatment method in phenolic resin coating operation relates to the technical field of processing plates by using phenolic resin. The method is used for solving the problems of low energy efficiency and poor waste gas treatment effect of phenolic resin coating operation in the prior art. A method for drying and treating waste gas in phenolic resin coating operation, which uses a waste gas incinerator to incinerate waste gas from an oven, comprises the following steps: A. mixing air with a part of tail gas of the waste gas incinerator by using a Venturi tube mixer to generate mixed gas; B. introducing the mixed gas into the oven, and drying the plate in the oven by using the mixed gas as a medium, wherein the mixed gas is mixed with gas generated by drying in the drying process to generate the waste gas; C. introducing the waste gas into an incinerator for incineration, and D, repeating the step A, B, C. The method is favorable for greatly reducing the generation of nitrogen oxides, reducing the waste gas treatment cost and reducing the drying cost.
Description
Technical Field
The invention relates to the technical field of processing plates by using phenolic resin, in particular to a drying and waste gas treatment method in phenolic resin coating operation.
Background
Phenolic resin is a material which can be used for processing and manufacturing special plates, for example, phenolic resin is used as an adhesive to manufacture special plates such as a flame-retardant plate, a heat-insulation plate or an insulation plate. In the production, the coating operation process of the phenolic resin comprises the following steps: dissolving phenolic resin by using an organic solvent; applying the phenolic resin solution to a substrate such as a grey cloth; and then, drying the grey cloth coated with the phenolic resin, namely, the drying operation is an important process in the phenolic resin coating operation. After the coating process flow is adopted, the insulating property or the strength of the plate can be improved.
When the plate coated with the phenolic resin is dried, the organic solvent (mostly methanol) used for dissolving the phenolic resin can be gasified in a high-temperature environment, and the drying function is to gasify the organic solvent. A large amount of exhaust gas is generated during the drying process. In the prior art, the waste gas is treated by introducing the waste gas into an incinerator, and the incinerator sucks air to support combustion. The result of this treatment is the production of more nitrogen oxides, which is not conducive to environmentally friendly emissions.
In addition, the drying operation is performed by installing a heat exchanging device in the oven, wherein the heat exchanging device uses steam as a heat source to heat the air medium in the oven, and further performs the drying operation on the grey fabric in the oven. The drying mode has large heat energy consumption, and increases the production cost of enterprises to a certain extent.
The above problems are summarized as problems of low drying energy efficiency and poor exhaust gas treatment effect in the phenolic resin coating work.
Therefore, the phenolic resin coating operation in the prior art has the problems of low drying energy efficiency and poor waste gas treatment effect.
Disclosure of Invention
The invention aims to provide a drying and waste gas treatment method in phenolic resin coating operation, which is used for solving the problems of low energy efficiency and poor waste gas treatment effect of the phenolic resin coating operation in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for drying and treating waste gas in phenolic resin coating operation, which uses a waste gas incinerator to incinerate waste gas from an oven, comprises the following steps:
A. mixing air with a part of tail gas of the waste gas incinerator by using a Venturi tube mixer to generate mixed gas;
B. introducing the mixed gas into the oven, and drying the grey cloth in the oven by using the mixed gas as a medium, wherein the mixed gas is mixed with gas generated by drying in the drying process to generate the waste gas;
C. introducing the exhaust gas into the incinerator for incineration;
D. the step A, B, C is repeated.
Further, the oxygen content of the waste gas is controlled to be 18.5% -20%.
Further, the method for mixing the air and the tail gas in the step A comprises the following steps,
connecting an air outlet of the venturi tube mixer with an air inlet of the oven through a first pipeline, and arranging a first fan on the first pipeline, wherein the first fan is used for leading the mixed gas from the venturi tube mixer to the oven;
the venturi tube mixer generates negative pressure at the two air inlets through the action of the first fan, wherein one air inlet is used for sucking air, and the other air inlet is used for sucking tail gas.
Furthermore, the control method of the oxygen content of the waste gas comprises the following steps,
the Venturi tube mixer is connected with the waste gas incinerator through a second pipeline, the second pipeline is used for introducing tail gas from the waste gas incinerator into the Venturi tube mixer, a hot air electromagnetic valve is arranged on the second pipeline and used for controlling the flow of the second pipeline, and an oxygen concentration detector is arranged in the drying oven;
and controlling the opening and closing amplitude of the hot air electromagnetic valve by using a PLC (programmable logic controller) control system according to a feedback signal of the oxygen concentration detector.
Further, the temperature of the mixed gas is controlled to be 140-160 ℃.
Further, the temperature of the exhaust gas for mixing with the air is controlled to be 280 degrees celsius.
Further, the tail gas is firstly subjected to dust removal treatment before entering the venturi mixer.
Further, the incinerator is of a gas type.
The beneficial effects are that: the air is mixed with part of tail gas of the waste gas incinerator by the Venturi tube mixer, so that the control of the oxygen content in the mixed gas is facilitated, and the control of the oxygen content in the mixed gas at a lower level is facilitated; the mixed gas entering the oven is mixed with the gasified organic solvent to form the waste gas, so that the oxygen content in the waste gas is reduced compared with the prior art, and the generation of nitrogen oxides is reduced in the combustion process of the waste gas. Meanwhile, the waste heat of partial tail gas generated by the waste gas incinerator is used for drying the plates in the oven, so that the energy utilization rate is improved, and the energy efficiency is greatly improved.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic illustration of an air and tail gas mixing process;
FIG. 3 is a schematic view of a method for controlling the oxygen content of the exhaust gas;
in the figure: 1 venturi blender, 2 first pipelines, 3 first fans, 4 ovens, 5 waste gas incinerators, 6 second pipelines, 7 hot air solenoid valves, 8 oxygen concentration detector, 9PLC control system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the method for drying and treating exhaust gas in the phenolic resin coating operation, which burns the exhaust gas from an oven by using an exhaust gas incinerator, comprises the following steps:
A. mixing air with a part of tail gas of the waste gas incinerator by using a Venturi tube mixer to generate mixed gas;
B. introducing the mixed gas into the oven, and drying the plate in the oven by using the mixed gas as a medium, wherein the mixed gas is mixed with gas generated by drying in the drying process to generate the waste gas;
C. introducing the exhaust gas into the incinerator for incineration.
D. The step A, B, C is repeated.
Wherein, the waste gas incinerator is connected with a second fan, and the second fan is used for making the inner chamber of the waste gas incinerator produce negative pressure. The exhaust gas incinerator uses the exhaust gas from the oven as the only combustion-supporting gas source.
In the process, the temperature of the tail gas mixed with the air is controlled to be 280 ℃, and the temperature of the mixed gas is controlled to be 140-160 ℃, so that the drying effect and the drying efficiency are improved.
In the above process, before entering the venturi mixer, the tail gas is first subjected to a dust removal process, for example, a bag-type dust remover is used for performing dust removal. The method is beneficial to keeping the used tail gas clean, ensuring the cleanness of the Venturi tube mixer and ensuring the gas to be fully and uniformly mixed. And then be favorable to guaranteeing the cleanness of mist, and then guarantee the cleanness of the internal environment of oven, be favorable to keeping the cleanness of product.
Above-mentioned in-process, waste gas incinerator adopts gas formula waste gas incinerator, can avoid producing the dust, guarantees the clean degree of flue gas, is favorable to guaranteeing mist's clean degree, guarantees by the cleanness of stoving product, is favorable to guaranteeing venturi blender's cleanness, and wherein, the preferred use burns burning furnace with the waste gas that the natural gas is fuel.
The invention has the advantages that the venturi tube mixer is used for mixing the air with part of tail gas of the waste gas incinerator, thereby being beneficial to controlling the oxygen content in the mixed gas and controlling the oxygen content in the mixed gas at a lower level; the mixed gas entering the oven is mixed with the gasified organic solvent to form the waste gas, so that the oxygen content in the waste gas is reduced compared with the prior art, and the generation of nitrogen oxides is reduced in the combustion process of the waste gas. Meanwhile, the waste heat of partial tail gas generated by the waste gas incinerator is used for drying the grey cloth in the oven, so that the energy utilization rate is improved, and the energy efficiency is greatly improved. Through using the venturi blender, be favorable to mixing air and the tail gas that has the waste heat uniformly, and then be favorable to the heat in the mist even, and then be favorable to improving the efficiency of drying. Meanwhile, the oxygen content in the waste gas can be conveniently controlled, and the furnace temperature of the waste gas incinerator can be conveniently controlled.
As shown in FIG. 1, in the above process, the oxygen content of the exhaust gas was controlled to be 18.5% to 20%. Namely, the waste gas is combusted by low oxygen, and oxygen enrichment and nitrogen reaction are not generated. Substitute for oxidant, neutralizer, reducer and catalytic bed. Reduction of NOXThe discharge amount is less than the standard value of 50 mg/L.
As shown in fig. 2, the air and the tail gas in step a are mixed by connecting the air outlet of the venturi mixer 1 and the air inlet of the oven 4 through a first pipeline 2, and arranging a first fan 3 on the first pipeline 2, wherein the first fan 3 is used for guiding the mixed gas from the venturi mixer 1 to the oven 4. The venturi mixer 1 generates negative pressure at two air inlets through the action of the first fan 3, wherein one air inlet is used for sucking air, and the other air inlet is used for sucking tail gas. This ensures a sufficient and uniform mixing of the exhaust gas with the air.
As shown in fig. 3, the oxygen content of the flue gas is controlled by connecting the venturi mixer 1 and the flue gas incinerator 5 through a second pipe 6, and the connection may be an inner cavity of the flue gas incinerator 5 or a flue of the flue gas incinerator, and is preferably connected to the flue. The second pipeline 6 is used for introducing tail gas from the waste gas incinerator into the venturi tube mixer 1, a hot air electromagnetic valve 7 is arranged on the second pipeline 6, the hot air electromagnetic valve 7 is used for controlling the flow of the second pipeline 6, and an oxygen concentration detector 8 is arranged in the oven 4; the PLC control system 9 is used for controlling the opening and closing amplitude of the hot air electromagnetic valve according to the feedback signal of the oxygen concentration detector, so that the proportion of air and flue gas is controlled, and the oxygen content in the waste gas is controlled. The method is favorable for accurately controlling the oxygen content in the waste gas in real time, further is favorable for effectively reducing the amount of nitrogen oxides generated in the combustion process of the waste gas, and greatly reduces the cost for treating the waste gas.
Claims (8)
1. A method for drying and treating waste gas in phenolic resin coating operation, which uses a waste gas incinerator to incinerate waste gas from an oven, is characterized by comprising the following steps:
A. mixing air with a part of tail gas of the waste gas incinerator by using a Venturi tube mixer to generate mixed gas;
B. introducing the mixed gas into the oven, and drying the plate in the oven by using the mixed gas as a medium, wherein the mixed gas is mixed with gas generated by drying in the drying process to generate the waste gas;
C. introducing the exhaust gas into the incinerator for incineration;
D. the step A, B, C is repeated.
2. The method for drying and treating exhaust gas in phenolic resin coating operation as claimed in claim 1, wherein the oxygen content of the exhaust gas is controlled to 18.5-20%.
3. The method for drying and treating exhaust gas in phenolic resin coating operation as claimed in claim 2, wherein the method for mixing air and exhaust gas in step A comprises,
connecting an air outlet of the venturi tube mixer with an air inlet of the oven through a first pipeline, and arranging a first fan on the first pipeline, wherein the first fan is used for leading the mixed gas from the venturi tube mixer to the oven;
the venturi tube mixer acts on two air inlets of the venturi tube mixer through the first fan to generate negative pressure, wherein the air inlet of one venturi tube mixer is used for sucking air, and the air inlet of the other venturi tube mixer is used for sucking tail gas.
4. The method for drying and treating exhaust gas in phenolic resin coating operation as claimed in claim 3, wherein the oxygen content of the exhaust gas is controlled by,
the Venturi tube mixer is connected with the waste gas incinerator through a second pipeline, the second pipeline is used for introducing tail gas from the waste gas incinerator into the Venturi tube mixer, a hot air electromagnetic valve is arranged on the second pipeline and used for controlling the flow of the second pipeline, and an oxygen concentration detector is arranged in the drying oven;
and controlling the opening and closing amplitude of the hot air electromagnetic valve by using a PLC (programmable logic controller) control system according to a feedback signal of the oxygen concentration detector.
5. The method for drying and treating exhaust gas in a phenolic resin coating operation according to claim 1, wherein the temperature of the mixed gas is controlled to 140 ℃ to 160 ℃.
6. The method for drying and treating exhaust gas in a phenol resin coating operation according to claim 1, wherein the temperature of the exhaust gas mixed with the air is controlled to 280 ℃.
7. The method of claim 1, wherein the exhaust gas is first dedusted before entering the venturi mixer.
8. The method for drying and treating exhaust gas in phenolic resin coating operation according to claim 1, wherein the incinerator is of gas combustion type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011270776.7A CN112393259A (en) | 2020-11-13 | 2020-11-13 | Drying and waste gas treatment method in phenolic resin coating operation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011270776.7A CN112393259A (en) | 2020-11-13 | 2020-11-13 | Drying and waste gas treatment method in phenolic resin coating operation |
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| CN112393259A true CN112393259A (en) | 2021-02-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053908A (en) * | 2007-05-24 | 2007-10-17 | 上海交通大学 | Pyrolytic treatment method for chromium slag |
| CN102553286A (en) * | 2012-01-17 | 2012-07-11 | 青岛华世洁环保科技有限公司 | Method and device for solvent recovery and incineration processing of coating production line drying workshop and comprehensive utilization of energy |
| CN105276616A (en) * | 2014-06-18 | 2016-01-27 | 阿尔斯通技术有限公司 | Method for recirculation of exhaust gas and gas turbine for conducting said method |
| CN210638473U (en) * | 2019-05-28 | 2020-05-29 | 浙江亿扬能源科技有限公司 | Flue gas waste heat utilization device for drying coal mine wet materials by using low-concentration gas |
| CN211753996U (en) * | 2020-02-27 | 2020-10-27 | 西安西热锅炉环保工程有限公司 | Air and flue gas mixing device based on Venturi principle |
-
2020
- 2020-11-13 CN CN202011270776.7A patent/CN112393259A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053908A (en) * | 2007-05-24 | 2007-10-17 | 上海交通大学 | Pyrolytic treatment method for chromium slag |
| CN102553286A (en) * | 2012-01-17 | 2012-07-11 | 青岛华世洁环保科技有限公司 | Method and device for solvent recovery and incineration processing of coating production line drying workshop and comprehensive utilization of energy |
| CN105276616A (en) * | 2014-06-18 | 2016-01-27 | 阿尔斯通技术有限公司 | Method for recirculation of exhaust gas and gas turbine for conducting said method |
| CN210638473U (en) * | 2019-05-28 | 2020-05-29 | 浙江亿扬能源科技有限公司 | Flue gas waste heat utilization device for drying coal mine wet materials by using low-concentration gas |
| CN211753996U (en) * | 2020-02-27 | 2020-10-27 | 西安西热锅炉环保工程有限公司 | Air and flue gas mixing device based on Venturi principle |
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Application publication date: 20210223 |
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