CN111821795A - Spraying waste gas treatment method - Google Patents
Spraying waste gas treatment method Download PDFInfo
- Publication number
- CN111821795A CN111821795A CN202010644121.5A CN202010644121A CN111821795A CN 111821795 A CN111821795 A CN 111821795A CN 202010644121 A CN202010644121 A CN 202010644121A CN 111821795 A CN111821795 A CN 111821795A
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- Prior art keywords
- waste gas
- spraying
- spraying waste
- treatment
- water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a spraying waste gas treatment method, which comprises the following steps: water curtain treatment: the spraying waste gas generated in the spraying process is pumped into a waste gas treatment chamber, a water curtain formed by circulating water on a water curtain baffle plate is used for carrying out spraying adsorption on the spraying waste gas entering the waste gas treatment chamber, paint mist in the spraying waste gas is brought into a circulating water tank by the water curtain, the spraying waste gas is subjected to rotary water washing, the spraying waste gas is fully mixed with the circulating water, and the spraying waste gas is sprayed and absorbed; defogging treatment: removing water vapor in the spraying waste gas subjected to water curtain treatment by a demisting device to obtain the spraying waste gas with the water vapor removed; and (3) combustion treatment: the spraying waste gas after demisting treatment is concentrated in a combustion furnace through a pipeline for high-temperature combustion, and the spraying waste gas after sufficient combustion is filtered by a high-temperature-resistant filter screen and then discharged. Through the mode, the spraying waste gas can be fully filtered, the purifying effect of the spraying waste gas is improved, and the environment-friendly requirement of waste gas emission is met.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a spraying waste gas treatment method.
Background
The spraying is a processing method for atomizing paint by a spray gun and coating the paint on the surface of an object, and is mainly used for drawing patterns and characters on the surface of a hard object. The spraying is classified into compressed air spraying, airless spraying, electrostatic spraying, and the like. The spraying operation has high production efficiency, is suitable for manual operation and industrial automatic production, has wide application range, mainly belongs to the fields of hardware, plastic cement, furniture, war industry, ships and the like, and is the most common coating mode applied at present.
The spraying waste gas generated in the spraying process contains highly dispersed paint mist and volatilized solvent, and is discharged without treatment, so that the environment is polluted, the human health is not facilitated, the coating is wasted, and the economic loss is caused. For the treatment of the spraying waste gas, on one hand, the highly dispersed paint mist needs to be removed, and on the other hand, the volatile organic solvent with low concentration needs to be treated.
For the treatment of low-concentration volatile organic solvent in the spraying waste gas, in the prior art, an adsorption method is mostly adopted, a zeolite rotating wheel is adopted for adsorption and concentration, and the adsorbed gas is directly discharged. The prior treatment process of spraying waste gas has the problems of incomplete removal of paint mist, high water consumption, incomplete removal of water vapor, unsatisfactory purification effect of the spraying waste gas and the like.
Disclosure of Invention
The invention mainly solves the technical problem of providing a spraying waste gas treatment method, which can fully filter spraying waste gas and improve the purification effect of the spraying waste gas.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a spraying exhaust gas treatment method comprises the following steps:
water curtain treatment: the spraying waste gas generated in the spraying process is pumped into a waste gas treatment chamber, a water curtain formed by circulating water on a water curtain baffle plate is used for carrying out spraying adsorption on the spraying waste gas entering the waste gas treatment chamber, paint mist in the spraying waste gas is brought into a circulating water tank by the water curtain, the spraying waste gas is subjected to rotary water washing, the spraying waste gas is fully mixed with the circulating water, and the spraying waste gas is sprayed and absorbed;
defogging treatment: removing water vapor in the spraying waste gas subjected to water curtain treatment by a demisting device to obtain the spraying waste gas with the water vapor removed;
and (3) combustion treatment: the spraying waste gas after demisting treatment is concentrated in a combustion furnace through a pipeline for high-temperature combustion, and the spraying waste gas after sufficient combustion is filtered by a high-temperature-resistant filter screen and then discharged.
Preferably, the method further comprises a filtering treatment, wherein the demisting-treated spraying waste gas is sequentially passed through the micron-sized demister, the filter cotton and the filter bag, and water vapor, paint slag and dust particles in the spraying waste gas are removed, so that the spraying waste gas containing volatile organic compounds is obtained.
Preferably, the method further comprises an adsorption treatment, wherein the filtered spraying waste gas is collected to an adsorption device to adsorb and remove volatile organic compounds in the spraying waste gas.
Preferably, in the water curtain treatment process, the beginning and the end of the steps of flushing adsorption, rotational flow water washing and spraying absorption are controlled by an infrared sensing device; when a human body enters an infrared sensing area, the controller drives the steps of flushing adsorption, rotational flow water washing and spraying absorption to be started; and (4) stopping the steps of flushing, adsorbing, whirling, washing and spraying and absorbing when the human body leaves the infrared induction area.
Preferably, a paint mist coagulant for decomposing and eliminating paint mist in the circulating water and a paint mist flocculating agent for flocculating and floating the paint mist in the circulating water are added into the circulating water in the water curtain treatment.
Preferably, the paint mist coagulant comprises the following components in percentage by mass: 20-50% of polyaluminium sulfate, 2-5% of sodium hydroxide, 6-10% of water-soluble melamine formaldehyde resin, 10-20% of aluminum chloride and the balance of water.
Preferably, the paint mist flocculating agent comprises the following components in percentage by mass: 20-50% of sodium polyacrylate, 5-10% of acrylamide and the balance of water.
Preferably, in the combustion treatment process, a detection device and an alarm device are arranged in the combustion furnace, the detection device carries out real-time monitoring on the VOC concentration in the combustion furnace, and the alarm device sends out an alarm signal after the VOC concentration exceeds a set value.
Preferably, in the combustion treatment process, the combustion temperature of the spraying waste gas in the combustion furnace is 680-840 ℃.
Due to the application of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the spraying waste gas treatment method is provided, the spraying waste gas is fully filtered through three purification steps of water curtain treatment, demisting treatment and combustion treatment, the purification effect of the spraying waste gas is improved, and the environmental protection requirement of waste gas emission is met.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
A spraying exhaust gas treatment method comprises the following steps:
water curtain treatment: the spraying waste gas generated in the spraying process is pumped into the waste gas treatment chamber through the suction device, the spraying waste gas entering the waste gas treatment chamber is sprayed and adsorbed by the water curtain formed by the circulating water on the water curtain baffle, the paint mist in the spraying waste gas is brought into the circulating water tank by the water curtain, the spraying waste gas is rotationally washed, and the circulating water tank is a component of a conventional water curtain cabinet. And the spraying waste gas is fully mixed with the circulating water, and the spraying waste gas is sprayed and absorbed.
In the water curtain treatment process, the beginning and the end of the steps of flushing, absorbing, rotational flow, washing and spraying, absorbing are controlled by an infrared sensing device. When a human body enters an infrared sensing area, the controller drives the steps of flushing adsorption, rotational flow water washing and spraying absorption to be started. And (4) stopping the steps of flushing, adsorbing, whirling, washing and spraying and absorbing when the human body leaves the infrared induction area. But through using infrared induction automatic control spraying exhaust-gas treatment process to begin and end, realized automatic operation, removed operating personnel from and frequently walked and stopped the machine, convenient to use has promoted energy-conserving effect.
The circulating water in the water curtain treatment is added with a paint mist coagulant for decomposing and eliminating the paint mist in the circulating water and a paint mist flocculating agent for flocculating and floating the paint mist in the circulating water. A circulating water cooperation for carrying out the water curtain and adding coating cloud coagulant and coating cloud flocculating agent in circulating water, the coating cloud coagulant can prevent effectively that the coating cloud from bonding at whirl device and cascade cabinet inner wall, and the coating cloud flocculating agent can effectively will circulate the coating cloud flocculation and the come-up of bad aquatic, is favorable to the clearance of coating cloud dross, prolongs the life cycle of circulating water, prevents that the coating cloud from blockking up the pipeline, reduces the harm to cascade cabinet equipment.
The paint mist coagulant comprises the following components in percentage by mass: 20-50% of polyaluminium sulfate, 2-5% of sodium hydroxide, 6-10% of water-soluble melamine formaldehyde resin, 10-20% of aluminum chloride and the balance of water. The paint mist flocculating agent comprises the following components in percentage by mass: 20-50% of sodium polyacrylate, 5-10% of acrylamide and the balance of water.
Defogging treatment: and (4) removing the water vapor in the spraying waste gas subjected to water curtain treatment by a demisting device to obtain the spraying waste gas with the water vapor removed. The demisting treatment further improves the paint mist removing effect, and reduces the paint mist and the water vapor entering the subsequent advanced treatment process.
And (3) filtering, namely sequentially passing the demisted spraying waste gas through a micron-sized demister, filter cotton and a filter bag to remove water vapor, paint slag and dust particles in the spraying waste gas to obtain the spraying waste gas containing volatile organic compounds.
And (4) performing adsorption treatment, namely concentrating the filtered spraying waste gas to an adsorption device, and adsorbing and removing volatile organic compounds in the spraying waste gas.
And (3) combustion treatment: and concentrating the demisted spraying waste gas into a combustion furnace for high-temperature combustion at 680-840 ℃ through a pipeline, and filtering the fully combusted spraying waste gas through a high-temperature-resistant filter screen and then discharging.
In the combustion treatment process, a detection device and an alarm device are arranged in the combustion furnace, the detection device carries out real-time monitoring on the VOC concentration in the combustion furnace, and the alarm device sends out an alarm signal after the VOC concentration exceeds a set value.
The spray coating waste gas is fully filtered through three purification steps of water curtain treatment, demisting treatment and combustion treatment, the removal rate of volatile organic compounds reaches 97%, and the emission requirement can be completely met. And because impurities such as dust particles in the spraying waste gas can be thoroughly removed, the treatment equipment is not easy to block, and the service life of the equipment can be effectively prolonged.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications made by the equivalent structures or equivalent processes in the present specification, or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (9)
1. A spraying waste gas treatment method is characterized by comprising the following steps:
water curtain treatment: the spraying waste gas generated in the spraying process is pumped into a waste gas treatment chamber, a water curtain formed by circulating water on a water curtain baffle plate is used for carrying out spraying adsorption on the spraying waste gas entering the waste gas treatment chamber, paint mist in the spraying waste gas is brought into a circulating water tank by the water curtain, the spraying waste gas is subjected to rotary water washing, the spraying waste gas is fully mixed with the circulating water, and the spraying waste gas is sprayed and absorbed;
defogging treatment: removing water vapor in the spraying waste gas subjected to water curtain treatment by a demisting device to obtain the spraying waste gas with the water vapor removed;
and (3) combustion treatment: the spraying waste gas after demisting treatment is concentrated in a combustion furnace through a pipeline for high-temperature combustion, and the spraying waste gas after sufficient combustion is filtered by a high-temperature-resistant filter screen and then discharged.
2. The spray coating exhaust gas treatment method according to claim 1, characterized in that: and the spraying waste gas after demisting treatment sequentially passes through the micron-sized demister, the filter cotton and the filter bag to remove water vapor, paint slag and dust particles in the spraying waste gas, so that the spraying waste gas containing volatile organic compounds is obtained.
3. The spray coating exhaust gas treatment method according to claim 1, characterized in that: the method also comprises adsorption treatment, wherein the spraying waste gas after filtration treatment is concentrated to an adsorption device, and volatile organic compounds in the spraying waste gas are adsorbed and removed.
4. The spray coating exhaust gas treatment method according to claim 1, characterized in that: in the water curtain treatment process, the beginning and the end of the steps of flushing adsorption, rotational flow water washing and spraying absorption are controlled by an infrared sensing device; when a human body enters an infrared sensing area, the controller drives the steps of flushing adsorption, rotational flow water washing and spraying absorption to be started; and (4) stopping the steps of flushing, adsorbing, whirling, washing and spraying and absorbing when the human body leaves the infrared induction area.
5. The spray coating exhaust gas treatment method according to claim 1, characterized in that: the circulating water in the water curtain treatment is added with a paint mist coagulant for decomposing and eliminating the paint mist in the circulating water and a paint mist flocculating agent for flocculating and floating the paint mist in the circulating water.
6. The spray coating exhaust gas treatment method according to claim 5, wherein: the paint mist coagulant comprises the following components in percentage by mass: 20-50% of polyaluminium sulfate, 2-5% of sodium hydroxide, 6-10% of water-soluble melamine formaldehyde resin, 10-20% of aluminum chloride and the balance of water.
7. The spray coating exhaust gas treatment method according to claim 5, wherein: the paint mist flocculating agent comprises the following components in percentage by mass: 20-50% of sodium polyacrylate, 5-10% of acrylamide and the balance of water.
8. The spray coating exhaust gas treatment method according to claim 1, characterized in that: in the combustion treatment process, a detection device and an alarm device are arranged in the combustion furnace, the detection device carries out real-time monitoring on the VOC concentration in the combustion furnace, and the alarm device sends out an alarm signal after the VOC concentration exceeds a set value.
9. The spray coating exhaust gas treatment method according to claim 1, characterized in that: in the combustion treatment process, the combustion temperature of the spraying waste gas in the combustion furnace is 680-840 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010644121.5A CN111821795A (en) | 2020-07-07 | 2020-07-07 | Spraying waste gas treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010644121.5A CN111821795A (en) | 2020-07-07 | 2020-07-07 | Spraying waste gas treatment method |
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| Publication Number | Publication Date |
|---|---|
| CN111821795A true CN111821795A (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010644121.5A Pending CN111821795A (en) | 2020-07-07 | 2020-07-07 | Spraying waste gas treatment method |
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| CN (1) | CN111821795A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105413362A (en) * | 2015-12-31 | 2016-03-23 | 吴永光 | Method for processing spray exhaust gas and water curtain cabinet |
| CN105498400A (en) * | 2015-12-31 | 2016-04-20 | 吴永光 | Paint mist treatment method and spraying tank |
| CN106563343A (en) * | 2015-10-10 | 2017-04-19 | 余姚市婉珍五金厂 | Method for purifying and treating spray paint waste gas |
| CN109316875A (en) * | 2017-07-31 | 2019-02-12 | 佛山市洁灏环保科技有限公司 | A kind of technique and spraying box handling coating cloud |
-
2020
- 2020-07-07 CN CN202010644121.5A patent/CN111821795A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106563343A (en) * | 2015-10-10 | 2017-04-19 | 余姚市婉珍五金厂 | Method for purifying and treating spray paint waste gas |
| CN105413362A (en) * | 2015-12-31 | 2016-03-23 | 吴永光 | Method for processing spray exhaust gas and water curtain cabinet |
| CN105498400A (en) * | 2015-12-31 | 2016-04-20 | 吴永光 | Paint mist treatment method and spraying tank |
| CN109316875A (en) * | 2017-07-31 | 2019-02-12 | 佛山市洁灏环保科技有限公司 | A kind of technique and spraying box handling coating cloud |
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Application publication date: 20201027 |