CN218095970U

CN218095970U - VOCs exhaust-gas treatment system is produced in paint spraying line

Info

Publication number: CN218095970U
Application number: CN202222049344.4U
Authority: CN
Inventors: 孙文豪
Original assignee: Shanghai Lijie Mechanical Engineering Co ltd
Current assignee: Shanghai Lijie Mechanical Engineering Co ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2022-12-20
Anticipated expiration: 2032-08-04

Abstract

The utility model discloses a VOCs exhaust-gas treatment system is produced in paint spraying line, include: the system comprises a first exhaust pipeline, a second exhaust pipeline, a third exhaust pipeline, a first fan, a second fan, a third fan and waste gas treatment equipment; the first exhaust pipeline is connected between the paint spraying area and the leveling area, and the first fan is arranged on the first exhaust pipeline; the second exhaust pipeline is connected between the leveling area and the oven drying area, and the second fan is arranged on the second exhaust pipeline; the third exhaust duct is connected between the oven drying area and the waste gas treatment equipment, and the third fan is arranged on the third exhaust duct. This system adopts the mode of establishing ties to establish ties artifical spraying region, levelling region and oven stoving region together to can improve exhaust-gas treatment equipment's treatment effeciency, reduce treatment cost, in addition, the heat energy of the waste gas of taking the temperature after the processing can be retrieved through the heat exchange and is gone in the oven of reentrant, has formed the partial inner loop of the energy, reduces comprehensive use cost once more.

Description

VOCs exhaust-gas treatment system is produced in paint spraying line

Technical Field

The utility model belongs to the technical field of the exhaust-gas treatment technique and specifically relates to a VOCs exhaust-gas treatment system is produced in paint spraying.

Background

Paint spraying is a common production process, and is commonly used for surface spraying of various devices, including: the sprayed paint mainly plays roles of beautifying, protecting base materials and resisting corrosion.

The spraying processing of the paint is mainly divided into three steps, namely paint spraying, leveling and oven drying. Specifically, exactly be exactly by the first spraying room that gets into of coated workpiece and carry out the spraying, then need wait for the leveling of a period of time and make the paint surface more even, send paint into the high temperature oven at last again and toast to thoroughly dry the residual solvent on paint surface, these three processes all can produce a large amount of VOCs waste gas, and VOCs is the general name to the organic volatile substance that the boiling point is less than 255 degrees, and these volatile substances not only can cause certain injury to the operating personnel health, still exert an influence to the environment.

At present, the mainstream process for treating waste gas in the paint spraying industry in China is zeolite rotating wheel + RTO/RCO, the investment cost and the operation cost of zeolite rotating wheel equipment are extremely expensive, and the scheme has the advantages that: install less to the transformation work load of producing the line earlier stage, the shortcoming: the process is complex, and many enterprises can not put into service or use the system, so the application is limited.

Therefore, it is an urgent technical problem in the art to design an exhaust gas treatment system that can eliminate the expensive zeolite runner and greatly reduce the investment cost and the use cost of the exhaust gas treatment equipment.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a VOCs exhaust-gas treatment system is produced in paint spraying line.

The technical scheme of the utility model as follows: the utility model provides a VOCs exhaust-gas treatment system is produced in paint spraying line, it is regional that production line includes paint spraying region, levelling region and oven stoving region, paint spraying region the levelling region with oven stoving region is airtight space, a serial communication port, processing system includes: the system comprises a first exhaust pipeline, a second exhaust pipeline, a third exhaust pipeline, a first fan, a second fan, a third fan and waste gas treatment equipment;

the first exhaust pipeline is connected between the paint spraying area and the leveling area, and the first fan is arranged on the first exhaust pipeline to send the waste gas of the paint spraying area into the leveling area;

the second exhaust pipeline is connected between the leveling area and the oven drying area, and the second fan is arranged on the second exhaust pipeline to send the waste gas in the leveling area into the oven drying area;

the third exhaust pipeline is connected between the oven drying area and the waste gas treatment equipment, and the third fan is arranged on the third exhaust pipeline so as to send waste gas in the oven drying area into the waste gas treatment equipment;

the waste gas treatment equipment is used for treating waste gas.

Preferably, the exhaust gas treatment device is an RTO furnace.

Preferably, an exhaust pipe is arranged on the RTO furnace, and an internal circulation fan and an internal circulation exhaust pipe connected with the internal circulation fan are arranged on the oven;

the treatment system further comprises a first heat exchanger, a second heat exchanger and a driving piece, the first heat exchanger is arranged on the exhaust pipe, the second heat exchanger is arranged on the internal circulation exhaust pipe, a first heat exchange channel is arranged inside the first heat exchanger, heat exchange media are arranged in the first heat exchange channel, the second heat exchanger is provided with a second heat exchange channel, the driving piece is connected between the first heat exchange channel and the second heat exchange channel, and the driving piece is used for driving the heat exchange media to circularly flow between the first heat exchange channel and the second heat exchange channel.

Preferably, the oven comprises a preheating oven body and a curing oven body, the interior of the preheating oven body is communicated with the second exhaust pipeline, the preheating oven body is communicated with the curing oven body, and the curing oven body is communicated with the third exhaust pipeline; the internal circulation fan and the internal circulation exhaust pipe are arranged on the preheating furnace body.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the paint spraying area, the leveling area and the oven drying area are connected in series in a series connection mode, so that the concentration of waste gas finally sent into the waste gas treatment equipment can be effectively improved, the air quantity of the waste gas finally sent into the waste gas treatment equipment is reduced, the treatment efficiency of the waste gas treatment equipment is finally improved, the treatment cost is reduced, and the energy-saving and environment-friendly effects are achieved;

2. this system still is equipped with first heat exchanger, second heat exchanger and driving piece to can make the oven can utilize the waste heat of RTO export waste gas, realize thermal recycle, thereby can reduce the cost of toasting of oven, reduce entire system's comprehensive treatment cost then, realize energy saving and consumption reduction.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work:

fig. 1 is a schematic diagram of the present invention.

The reference numbers are as follows:

1. a paint spraying area; 2. a leveling area; 3. an oven drying area; 4. a first exhaust duct; 5. a second exhaust conduit; 6. a third exhaust conduit; 7. a first fan; 8. a second fan; 9. a third fan; 10. an exhaust gas treatment device; 11. an exhaust pipe; 12. an internal circulation fan; 13. an internal circulation exhaust pipe; 14. a first heat exchanger; 15. a second heat exchanger; 16. preheating a furnace body; 17. and (5) curing the furnace body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted", "connected", "fixed", and the like are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The following describes a paint spraying production line VOCs exhaust-gas treatment system according to the embodiment of the present invention with reference to the attached drawing FIG. 1, and the system is mainly applied to the treatment of VOCs exhaust gas generated in the paint spraying process, wherein the processing of paint is mainly divided into three steps, i.e. paint spraying, leveling and oven drying. Specifically, a coated workpiece firstly enters a spraying room for spraying, then the workpiece needs to wait for a period of time for leveling to enable the paint surface to be more uniform, and finally the paint is sent into a high-temperature oven for baking so as to thoroughly dry the residual solvent on the paint surface.

In the process, the paint leveling and the oven drying can be automatically operated by means of equipment, so that on a production line, a paint spraying area, a leveling area and an oven drying area are all closed spaces.

Based on this kind of processing condition of producing the line, the utility model people has designed a VOCs exhaust-gas treatment system, and this system includes: the system comprises a first exhaust pipeline, a second exhaust pipeline, a third exhaust pipeline, a first fan, a second fan, a third fan and waste gas treatment equipment.

The first exhaust pipeline is connected between the paint spraying area and the leveling area, and the first fan is arranged on the first exhaust pipeline to send the waste gas in the paint spraying area into the leveling area; the second exhaust pipeline is connected between the leveling area and the oven drying area, and the second fan is arranged on the second exhaust pipeline to send the waste gas in the leveling area into the oven drying area; the third exhaust pipeline is connected between the oven drying area and the waste gas treatment equipment, and the third fan is arranged on the third exhaust pipeline to send the waste gas in the oven drying area into the waste gas treatment equipment; the waste gas treatment equipment is used for treating waste gas.

The waste gas treatment equipment is used for treating waste gas, the types of the waste gas treatment equipment are various, the waste gas treatment equipment adopted by the system is a heat accumulating type high-temperature thermal oxidation furnace (namely an RTO furnace), and the system has the principle that organic waste gas is heated to a temperature higher than a centigrade so that VOC in the waste gas is oxidized and decomposed into carbon dioxide and water. The high-temperature gas generated by oxidation flows through a specially-made ceramic heat accumulator to heat the ceramic body so as to realize heat accumulation, and the heat accumulation is used for preheating the subsequently-entering organic waste gas. Thereby saving fuel consumption for exhaust gas temperature rise. The ceramic heat accumulator is divided into more than two (including two) areas or chambers, and each heat accumulator sequentially goes through the procedures of heat accumulation, heat release, cleaning and the like, and the ceramic heat accumulator works repeatedly and continuously.

RTO has the following advantages:

● Can treat almost all exhaust gas containing organic compounds

● Can treat organic waste gas with large air quantity and low concentration

● The flexibility of treating the flow of the organic waste gas is very large (the nominal flow is 30-100%)

● Can adapt to the change and fluctuation of the composition and concentration of VOC in organic waste gas

● Is not sensitive to small amount of dust and solid particles entrained in the waste gas

● The thermal efficiency is highest (> 95%) in all thermal combustion purification methods

● Self-heating operation without adding auxiliary fuel under proper exhaust gas concentration condition

● High purification efficiency (99% for rotating and three chambers)

● Less maintenance workload and safe and reliable operation

● The organic precipitate can be periodically removed, and the heat accumulator can be replaced

● The pressure loss of the whole device is small

● Long service life of device

More detailed principles of operation and structures regarding RTO are well known to those skilled in the art and will not be described in detail.

The operation principle of the system is as follows: this system is through first exhaust duct, second exhaust duct and third exhaust duct's setting, in fact with paint spraying region, the levelling is regional and the oven dries regional series connection together, like this under the effect that corresponds the pipeline fan, the regional waste gas of paint spraying can get into the levelling region, waste gas in the levelling region then gets into the oven drying region in, waste gas in the oven drying region gets into third exhaust duct again, gets into exhaust-gas treatment equipment at last and handles.

The paint spraying area, the leveling area and the oven drying area correspond to three processing stages of paint spraying, leveling and drying, and VOCs waste gas is generated in each stage of the three processing stages. From the view of VOCs waste gas concentration, the paint spraying area is smaller than the leveling area and smaller than the oven drying area; from the working temperature, the oven drying area is high temperature, and the paint spraying area and the leveling area are room temperature; from the participation of personnel, people generally exist in a paint spraying area, and no people exist in a leveling area and an oven drying area; from the sealing condition, the paint spraying area, the leveling area and the oven drying area are all sealed spaces.

After the three areas are connected in series, when the second fan pumps out air in the leveling area, the first fan can supplement air in the paint spraying area into the leveling area, and dynamic balance of air in and out of the leveling area is maintained; when the third fan takes out the air in the oven drying area, the second fan can supplement the air in the leveling area into the oven drying area, and the dynamic balance of the air in and out of the oven drying area is maintained, so that the air overflow of two sealed areas can be avoided.

In this case, the concentration of the VOCs waste gas in the leveling area will increase because the VOCs waste gas in the paint spraying area at the previous stage is mixed in the air supplemented into the leveling area, and the VOCs waste gas volatilized at the self stage in the leveling area is added; the VOCs waste gas in the upper-stage leveling area is mixed in the air supplemented into the oven drying area, and in addition, the VOCs waste gas volatilized in the oven drying area at the self stage is added, so that the concentration of the VOCs waste gas in the oven drying area can be increased, the total volume of the air discharged from the oven drying area can be basically kept unchanged before and after series connection, and the concentration of the VOCs waste gas after series connection can be obviously increased. When further handling in the RTO stove, because the VOCs in the waste gas oxidation heat of giving off under high temperature can reduce the consumption to the natural gas, consequently the volume of the natural gas that the RTO of in-service use consumed will reduce to effectively reduce the exhaust-gas treatment cost, improve energy utilization efficiency, energy-concerving and environment-protective.

In the series connection mode of the system, the paint spraying area is required to be in front, and the leveling area and the oven drying area are required to be behind, so that in the gas flowing process, the VOCs waste gas only flows backwards into the rear airtight unmanned leveling area and the oven drying area, and the damage to the bodies of operators due to the increase of the concentration of the VOCs waste gas in the paint spraying area can be avoided; since the oven drying zone is located last, the temperature of the VOCs flue gas that is ultimately exhausted from the oven drying zone after heating through the oven drying zone will be higher and thus easier to process in the RTO apparatus.

If the exhaust gas from the paint spraying area, the leveling area and the oven drying area are fed to the exhaust gas treatment device in parallel, the amount of the exhaust gas finally fed to the exhaust gas treatment device is the sum of the three exhaust gas amounts, which increases the treatment load of the exhaust gas treatment device, and the exhaust gas amount is the volume amount (generally in cubic units per hour) of the exhaust gas. In addition, the exhaust gas temperature in the paint spraying area and the leveling area is lower, and after the exhaust gas enters the exhaust gas treatment equipment for treatment, the exhaust gas is heated, the temperature is increased, and more fuel is consumed. If the series connection mode is adopted, the amount of the waste gas finally entering the waste gas treatment equipment is the amount of the waste gas discharged from the drying area of the oven, the mode can reduce the amount of the waste gas to 1/3 of the amount of the waste gas in parallel connection, and the concentration of the waste gas is obviously improved.

Further, considering that the waste gas treated by the RTO oven has a certain amount of heat, the direct discharge of the hot gas into the atmosphere causes waste of heat, and the oven just needs a certain amount of heat to bake the paint, some structures can be designed to make the oven capable of utilizing the residual heat at the outlet of the RTO oven.

Particularly, be equipped with the blast pipe on the RTO stove, be equipped with the inner loop fan on the oven and with the inner loop blast pipe that the inner loop fan links to each other, the inner loop fan who sets up exhausts back and discharges through the inner loop blast pipe again, can increase the gas circulation in the oven from this, increase the circulation speed of air to let paint can fast drying.

The treatment system further comprises a first heat exchanger, a second heat exchanger and a driving piece, the first heat exchanger is arranged on the exhaust pipe, the second heat exchanger is arranged on the internal circulation exhaust pipe, a first heat exchange channel is arranged in the first heat exchanger, a heat exchange medium is arranged in the first heat exchange channel, the second heat exchanger is provided with a second heat exchange channel, the driving piece is connected between the first heat exchange channel and the second heat exchange channel, and the driving piece is used for driving the heat exchange medium to circularly flow between the first heat exchange channel and the second heat exchange channel.

So, heat transfer medium can carry out the heat exchange with the hot waste gas through blast pipe exhaust when first heat transfer passageway flows, thereby improve self temperature, then under the effect of driving piece, hot heat transfer medium can flow to second heat transfer passageway, again with the air in the inner loop blast pipe carry out the heat transfer, and the temperature of the air in the inner loop blast pipe after the heat transfer can rise, after discharging through the inner loop blast pipe like this, can toast the drying as the auxiliary heat source of oven, realize thermal recycle, thereby can reduce the toasting cost of oven, then reduce entire system's comprehensive treatment cost, realize energy saving and consumption reduction.

In practical application, the heat exchange medium can be set to be a gaseous medium or a liquid medium according to requirements, if the heat exchange medium is the gaseous medium, the driving part is an air pump, and if the heat exchange medium is a liquid medium such as water, the driving part is a fluid pump such as a water pump.

Optionally, when the liquid medium is water, a water tank may be disposed between the first heat exchanger and the second heat exchanger, and two water pumps may be driven, one of the water tanks is used for driving water to circularly flow between the water tank and the first heat exchanger, and the other of the water tanks is used for driving water to circularly flow between the water tank and the second heat exchanger.

In addition, in some embodiments, in order to further reduce the energy consumption of the oven, the internal area of the oven can be designed into a plurality of baking areas from the original baking area, and the temperature of each baking area changes in a gradient manner, so that the disposable requirement of a conventional heat source can be changed into a multi-level requirement, and a plurality of heat energy requirements for the oven can be treated in a segmented manner, thereby realizing different requirements for heat energy at different stages. Such as: the furnace body of 80 ℃ can be changed into an intermediate furnace of room temperature to 50 ℃ and then an oven of 80 ℃. Thus, with the intermediate furnace, the workpiece is preheated and finally treated in the baking area with higher temperature, so that the high-temperature treatment time can be shortened. That is, compare with original unification and handle in the high temperature region, after like this gradient design, the work piece can experience a processing procedure that progressively heats up, and through extension low temperature treatment time in earlier stage, can reduce the time of final high temperature treatment, finally is favorable to reaching the energy loss that reduces whole oven.

Based on this, the oven in the scheme comprises a preheating oven body and a curing oven body, wherein the interior of the preheating oven body is communicated with a second exhaust pipeline, the preheating oven body is communicated with the curing oven body, and the curing oven body is communicated with a third exhaust pipeline; the internal circulation fan and the internal circulation exhaust pipe are arranged on the preheating furnace body.

Therefore, the outlet waste heat of the RTO furnace is mainly recycled in the preheating furnace body, and the workpieces are preheated in the preheating furnace body for a period of time and then sent into the curing furnace body for final high-temperature curing, so that the energy loss of the whole oven can be further reduced.

In summary, the system has the following characteristics:

1. the paint spraying area, the leveling area and the oven drying area are connected in series by adopting a series connection mode, so that the concentration of waste gas finally sent into the waste gas treatment equipment can be effectively improved, the air quantity of the waste gas finally sent into the waste gas treatment equipment is reduced, the treatment efficiency of the waste gas treatment equipment is finally improved, the treatment cost is reduced, and the energy-saving and environment-friendly effects are achieved;

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a VOCs exhaust-gas treatment system is produced in paint spraying line, it includes that paint spraying is regional, levelling is regional and oven stoving is regional to produce the line, paint spraying is regional levelling regional with oven stoving is regional and is airtight space, a serial communication port, processing system includes: the system comprises a first exhaust pipeline, a second exhaust pipeline, a third exhaust pipeline, a first fan, a second fan, a third fan and waste gas treatment equipment;

the waste gas treatment equipment is used for treating waste gas.

2. The paint spraying production line VOCs exhaust treatment system of claim 1, wherein the exhaust treatment device is an RTO furnace.

3. The VOCs waste gas treatment system of claim 2, wherein the RTO furnace is provided with an exhaust pipe, and the oven is provided with an internal circulation fan and an internal circulation exhaust pipe connected with the internal circulation fan;

4. The paint spraying production line VOCs waste gas treatment system of claim 3, wherein the oven comprises a preheating oven body and a curing oven body, the interior of the preheating oven body is communicated with the second exhaust duct, the preheating oven body is communicated with the curing oven body, and the curing oven body is communicated with the third exhaust duct; the internal circulation fan and the internal circulation exhaust pipe are arranged on the preheating furnace body.