阅读说明：本技术 一种涂装生产线dto废气处理与热回收系统 (Coating line DTO exhaust-gas treatment and heat recovery system ) 是由 张志成 周海亮 代百乾 于 2021-07-22 设计创作，主要内容包括：本发明涉及一种涂装生产线DTO废气处理与热回收系统,包括废气主流路、热风回路以及热交换器组,废气主流路密封连接有并联设置的第一废气流路以及第二废气流路,第一废气流路的支路流体连接有涂装线烘箱组,热风回路上安装有热风风机,热风回路流体连接有多个热风支路,热交换器组包括第一热交换器、第二热交换器以及第三热交换器,废气主流路输出端密封连接有DTO燃烧炉,第一热交换器上安装有冷却风机,第二热交换器密封连接有排气流路,排气流路上设有排气风机以及排气口。本发明可有效提升热利用率,节约热源,其经济效应高,处理废气彻底,安全性高。(The invention relates to a DTO (direct thermal oxidizer) waste gas treatment and heat recovery system for a coating production line, which comprises a waste gas main flow path, a hot air loop and a heat exchanger group, wherein the waste gas main flow path is hermetically connected with a first waste gas flow path and a second waste gas flow path which are arranged in parallel, a branch of the first waste gas flow path is fluidly connected with a coating line drying box group, a hot air fan is arranged on the hot air loop, the hot air loop is fluidly connected with a plurality of hot air branches, the heat exchanger group comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the output end of the waste gas main flow path is hermetically connected with a DTO (thermal oxidizer), the first heat exchanger is provided with a cooling fan, the second heat exchanger is hermetically connected with an exhaust flow path, and the exhaust flow path is provided with an exhaust fan and an exhaust port. The invention can effectively improve the heat utilization rate, save heat sources, has high economic effect, thoroughly treats waste gas and has high safety.)

1. The utility model provides a coating production line DTO exhaust-gas treatment and heat recovery system, a serial communication port, including waste gas main flow path (100), hot-blast return circuit (200) and heat exchanger group (300), waste gas main flow path (100) sealing connection has parallelly connected first waste gas flow path (110) and second waste gas flow path (120) that set up, the branch road of first waste gas flow path (110) has coating line drying cabinet group (600) through pipeline fluid connection, install hot-blast fan (210) on hot-blast return circuit (200), hot-blast return circuit (200) fluid connection has a plurality of hot-blast branch road (220), admission valve (230) are installed to hot-blast branch road (220) output department, be equipped with draught fan (130) No. one on waste gas main flow path (100), heat exchanger group (300) include first heat exchanger (310), second heat exchanger (320) and third heat exchanger (330), the output end of the waste gas main flow path (100) is hermetically connected with a DTO combustion furnace (400) for generating heat flow, the combustion temperature in the DTO combustion furnace (400) is controlled within the range of 700-780 ℃, the DTO combustion furnace (400) is sequentially connected with the first heat exchanger (310) and the second heat exchanger (320) in series, the waste gas main flow path (100) flows through the first heat exchanger (310) and the second heat exchanger (320) and carries out heat convection with the heat flow generated by the DTO combustion furnace (400), the first heat exchanger (310) is provided with a cooling fan (311) for conveying a gas source to the heat flow generated by the DTO combustion furnace (400), the second heat exchanger (320) is hermetically connected with an exhaust flow path (500), and the hot air loop (200) and the exhaust flow path (500) are connected in parallel at the output end of the second heat exchanger (320), an exhaust fan (520) and an exhaust port (530) are provided in the exhaust flow path (500).

2. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: an air flow distributor (510) is installed at the output end of the second heat exchanger (320), the air flow distributor (510) is provided with two output ports, and the two output ports are respectively and correspondingly connected with the hot air loop (200) and the exhaust air flow path (500) in a sealing mode.

3. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: the second waste gas flow path (120) is connected with a first coating room (121) and a second coating room (122) which are arranged in parallel through pipelines, and a second induced draft fan (140) is arranged on the second waste gas flow path (120).

4. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: and a blower is arranged on a pipeline at the tail end of the air inlet valve (230).

5. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: the DTO combustion furnace (400) is provided with a gas pipe (410) and an exhaust gas interface (420), the gas pipe (410) is used for introducing combustion media into the DTO combustion furnace (400), and the exhaust gas interface (420) is connected with the output end of the exhaust gas main flow path (100).

6. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: the coating line oven group (600) comprises a plurality of first ovens (610), a plurality of second ovens (620) and a plurality of third ovens (630), wherein each of the first ovens (610), the second ovens (620) and the third ovens (630) is connected with the hot air branch (220) and the branch of the first exhaust air flow path (110), an exhaust valve (150) is installed on the branch of the first exhaust air flow path (110)), and the coating line oven group (600) further comprises a first drying box (611), a second drying box (621) and a third drying box (631) which are connected with the hot air branch (220).

7. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: the hot air branch (220) is in fluid connection with a processing chamber (221) and a drying chamber (222).

8. The coating line DTO exhaust gas treatment and heat recovery system of claim 1, wherein: the heat exchanger group (300) further comprises a fourth heat exchanger (340), and the fourth heat exchanger (340) is connected and arranged in the exhaust gas flow path (500).

9. The coating line DTO exhaust gas treatment and heat recovery system of claim 8, wherein: the fourth heat exchanger (340) is a water body heat exchanger, the fourth heat exchanger (340) is in fluid connection with a pretreatment auxiliary tank (700) through a water heat exchange flow path (710), the pretreatment auxiliary tank (700) and the fourth heat exchanger (340) form a circulation flow path, and a water pump (711) is arranged on the water heat exchange flow path (710).

10. The coating line DTO exhaust gas treatment and heat recovery system of claim 9, wherein: six groups of the fourth heat exchangers (340) are arranged in parallel.

Technical Field

The invention relates to the technical field of coating production line waste gas treatment, in particular to a DTO waste gas treatment and heat recovery system for a coating production line.

Background

The DTO is a direct-fired high-temperature combustion furnace, can fully utilize the flammability of organic waste gas, and recycles the heat of the organic waste gas under the high-temperature condition. The process can treat various combustible organic waste gases including benzene, alcohol, aldehyde, ester, ketone, ether and the like, and can treat all volatile matters of coatings and diluents corresponding to paint varieties such as polyester, fluorocarbon, acrylic acid, epoxy and the like. In a coating production line, organic waste gas is generated due to volatilization of an organic solvent, and main components comprise triphenyl, alcohol, ether, aldehyde, phenol, ketone, ester and the like, which are volatile, toxic and malodorous gases and the like. The gases cannot be directly discharged due to toxicity, and need to be discharged after being converted into carbon dioxide and water through high-temperature oxidation, and the heat generated in the combustion process can be recycled for preheating and drying processes of the coating line.

Among the prior art, the treatment facility to waste gas is collected to waste gas and is concentrated incompletely, and the heat after the exhaust-gas treatment collects the low-usage moreover, like patent application no: 201610196035.6 discloses a direct combustion type waste gas treatment and heat energy utilization system and method, through burning the organic waste gas produced by the oven in the incinerator, then supplying the burning heat energy to the oven, recovering the heat energy while treating the organic waste gas, improving the heat energy utilization rate, the waste gas collection is not thorough, because of the particularity of the production line of the coating production line, the coating can not be volatilized all the time to produce waste gas, the accumulation of the waste gas concentration has bad safety hazard, the safety is low, the reliability is poor, and the heat flow discharge of the heat exchange back process section exists, the heat energy utilization is not thorough; as another example, patent application No.: 201610372638.7, the high-temperature waste gas in the high-temperature drying area is returned to the incinerator again, so that the incinerator can be always kept at a high working temperature, fuel consumption of waste gas preheating and temperature rising is saved, but the heat source is not fully utilized, and economic benefit is low.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a DTO waste gas treatment and heat recovery system for a coating production line, which can effectively improve the heat utilization rate and save heat sources, and has the advantages of high economic effect, thorough waste gas treatment and high safety.

The invention provides the following technical scheme:

a DTO waste gas treatment and heat recovery system for a coating production line comprises a waste gas main flow path, a hot air loop and a heat exchanger group, wherein the waste gas main flow path is hermetically connected with a first waste gas flow path and a second waste gas flow path which are arranged in parallel, branches of the first waste gas flow path are fluidly connected with a coating line baking box group through pipelines, the hot air loop is provided with a hot air fan, the hot air loop is fluidly connected with a plurality of hot air branches, an air inlet valve is arranged at the output end of each hot air branch, a first induced draft fan is arranged on the waste gas main flow path, the heat exchanger group comprises a first heat exchanger, a second heat exchanger and a third heat exchanger, the output end of the waste gas main flow path is hermetically connected with a DTO combustion furnace for generating heat flow, the combustion temperature in the DTO combustion furnace is controlled within the range of 700-, the main waste gas flow path flows through the first heat exchanger and the second heat exchanger and carries out heat convection with heat flow generated by the DTO combustion furnace, a cooling fan for conveying an air source to the heat flow generated by the DTO combustion furnace is arranged on the first heat exchanger, the second heat exchanger is connected with an exhaust flow path in a sealing mode, the hot air loop and the exhaust flow path are arranged at the output end of the second heat exchanger in parallel, and an exhaust fan and an exhaust port are arranged on the exhaust flow path.

Preferably, an air flow distributor is installed at an output end of the second heat exchanger, and the air flow distributor has two output ports, and the two output ports respectively and correspondingly and hermetically connect the hot air loop and the exhaust flow path.

Preferably, the second exhaust gas flow path is connected with a first coating chamber and a second coating chamber which are arranged in parallel through pipelines, and a second induced draft fan is arranged on the second exhaust gas flow path.

Preferably, a blower is mounted on a pipeline at the tail end of the air inlet valve.

Preferably, a gas pipe and an exhaust gas interface are installed on the DTO combustion furnace, the gas pipe is used for introducing a combustion medium into the DTO combustion furnace, and the exhaust gas interface is connected with an output end of the exhaust gas main flow path.

Preferably, the coating line oven group comprises a plurality of first ovens, a plurality of second ovens and a plurality of third ovens, each of the first ovens, the second ovens and the third ovens are connected with the hot air branch and the branch of the first exhaust gas flow path respectively, an exhaust valve is installed on the branch of the first exhaust gas flow path, and the coating line oven group further comprises a first blow-drying box, a second blow-drying box and a third blow-drying box which are connected with the hot air branch respectively.

Preferably, the hot air branch is fluidly connected with a treatment chamber and a drying chamber.

Preferably, the heat exchanger group further includes a fourth heat exchanger connectively disposed within the exhaust gas flow path.

Preferably, the fourth heat exchanger is a water body heat exchanger, the fourth heat exchanger is fluidly connected with a pretreatment auxiliary tank through a water heat exchange flow path, the pretreatment auxiliary tank and the fourth heat exchanger form a circulation flow path, and a water pump is arranged on the water heat exchange flow path.

Preferably, the fourth heat exchangers are arranged in six groups in parallel.

The invention has the beneficial effects that:

(1): organic waste gas generated by the coating line oven group is collected in a waste gas main flow path through a first waste gas flow path, the organic waste gas of the waste gas main flow path is heated through a first heat exchanger and a second heat exchanger in the heat exchanger group and carries out convective heat exchange with heat flow generated by the DTO combustion furnace, so that the reasonable temperature of the organic waste gas entering the DTO combustion furnace is ensured, the DTO combustion furnace cracks the organic waste gas thoroughly, the gas in the exhaust flow path is clean and stable, a cooling fan conveys a gas source to the heat flow generated by the DTO combustion furnace, the temperature is reduced for heat exchange and the balance of hot gas is supplemented, the heat utilization rate can be effectively improved, the heat source is saved, the economic effect is high, and the waste gas is treated thoroughly;

(2): the airflow distributor is utilized to fully ensure the heat flow required by the hot air loop end, and the hot air in the hot air loop is pressurized and drained through the hot air fan, so that the recycling of heat of the system is promoted;

(3): the waste gas in the second waste gas flow path is guided by the second induced draft fan, the waste gas in the waste gas main flow path is guided by the first induced draft fan, the waste gas is promoted to be collected in the waste gas main flow path to intensively enter the DTO combustion furnace, the concentration of organic waste gas in each space of waste gas generated by the system can be reduced, and the safety is high;

(4): the fourth heat exchanger and the pretreatment auxiliary tank form circulating heat exchange through the water heat exchange flow path, and heat is supplied to the pretreatment auxiliary tank by the heat source with a lower back stroke of the exhaust flow path, so that the heat utilization rate is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of the operating principle of the system of the present invention;

FIG. 2 is a schematic view of the configuration of the air flow distributor of the present invention;

fig. 3 is a schematic view of the structure of a first heat exchanger according to the present invention.

The labels in the figure are: 100-main flow path of waste gas; 110 — a first exhaust flow path; 120-a second exhaust gas flow path; 121-a first coating booth; 122-a second coating booth; 130-a first induced draft fan; 140-second induced draft fan; 150-exhaust valve; 200-hot air circuit; 210-a hot air blower; 220-hot air branch; 221-a processing chamber; 222-a drying chamber; 230-an intake valve; 300-heat exchanger group; 310-a first heat exchanger; 311-cooling fan; 320-a second heat exchanger; 330-a third heat exchanger; 340-a fourth heat exchanger; a 400-DTO burner; 410-a gas pipe; 420-an exhaust interface; 500-an exhaust gas flow path; 510-an air flow distributor; 520-an exhaust fan; 530-an exhaust port; 600-coating line oven group; 610-a first oven; 611-first blow dry box; 620-second oven; 621-second blow-dry box; 630-third oven; 631-third blow-dry box; 700-pretreatment of the auxiliary tank; 710-water heat exchange flow path; 711-water pump.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1:

referring to fig. 1 and 2, the embodiment provides a DTO waste gas treatment and heat recovery system for a coating line, including a waste gas main flow path 100, a hot air loop 200 and a heat exchanger set 300, wherein the waste gas main flow path 100 is hermetically connected with a first waste gas flow path 110 and a second waste gas flow path 120 which are arranged in parallel, a branch of the first waste gas flow path 110 is fluidly connected with a coating line oven set 600 through a pipeline, a hot air blower 210 is installed on the hot air loop 200, the hot air loop 200 is fluidly connected with a plurality of hot air branch paths 220, an air inlet valve 230 is installed at an output end of the hot air branch 220, wherein a blower is installed on a pipeline at a tail end of the air inlet valve 230, the blower is used to send heat flow into a corresponding oven in the coating line oven set 600, a first draught fan 130 is installed on the waste gas main flow path 100, and the heat exchanger set 300 includes a first heat exchanger 310, a second heat exchanger 320 and a third heat exchanger 330, the output end of the waste gas main flow path 100 is hermetically connected with a DTO combustion furnace 400 for generating heat flow, the combustion temperature in the DTO combustion furnace 400 is controlled within the range of 700-.

The second waste gas flow path 120 is connected with a first coating chamber 121 and a second coating chamber 122 which are arranged in parallel through pipelines, a second induced draft fan 140 is arranged on the second waste gas flow path 120, waste gas in the second waste gas flow path 120 is guided through the second induced draft fan 140, and organic waste gas is promoted to collect and enter the waste gas main flow path 100.

The DTO combustion furnace 400 is provided with a gas pipe 410 and a waste gas interface 420, the gas pipe 410 is used for introducing combustion media into the DTO combustion furnace 400, the combustion media can be combustion-supporting by natural gas, and the waste gas interface 420 is connected with the output end of the waste gas main flow path 100.

The coating line oven group 600 comprises a plurality of first ovens 610, a plurality of second ovens 620 and a plurality of third ovens 630, wherein each of the first ovens 610, the second ovens 620 and the third ovens 630 is connected with a hot air branch 220 and a branch of a first waste air flow path 110, an exhaust valve 150 is installed on the branch of the first waste air flow path 110, the exhaust valve 150 is used for releasing and discharging organic waste air generated in each oven and collecting the organic waste air in a waste air main flow path 100 through the first waste air flow path 110, the coating line oven group 600 further comprises a first drying box 611, a second drying box 621 and a third drying box 631 which are connected with the hot air branch 220, and the hot air recovered by the hot air branch 220 is used for supplying heat to the drying boxes.

Further, the hot air branch 220 is fluidly connected with a processing chamber 221 and a drying chamber 222.

Example 2:

on the basis of the above embodiment, referring to fig. 3, the output end of the second heat exchanger 320 is provided with an air flow distributor 510, and the air flow distributor 510 has two output ports, and the two output ports are respectively and correspondingly connected with the hot air loop 200 and the exhaust air flow path 500 in a sealing manner.

The heat flow required by the coating line oven group 600, the processing chamber 221 and the drying chamber 222 connected to the end of the hot air loop 200 is distributed into the hot air loop 200 by the air flow distributor 510, and the rest of the heat flow is distributed into the exhaust flow path 500 for centralized discharge.

Example 3:

this example differs from example 1 in that: the heat exchanger set 300 further comprises a fourth heat exchanger 340, wherein the fourth heat exchanger 340 is connected and arranged in the exhaust gas flow path 500; specifically, the fourth heat exchanger 340 is a water body heat exchanger, the fourth heat exchanger 340 is fluidly connected to a pretreatment auxiliary tank 700 through a water heat exchange flow path 710, the pretreatment auxiliary tank 700 and the fourth heat exchanger 340 form a circulation flow path, a water pump 711 is arranged on the water heat exchange flow path 710, the water pump 711 is used for adjusting the flow rate of circulating water of the water heat exchange flow path 710 and promoting a heat exchange process, and preferably, six groups of the fourth heat exchanger 340 are arranged in parallel. The heat source with lower back of the exhaust flow path 500 is used for supplying heat to the pretreatment auxiliary tank 700, so that the heat utilization rate is improved

The working principle of the invention is that organic waste gas (about 220 ℃) volatilized by a coating line oven group 600 and organic waste gas (about 20 ℃) naturally volatilized by a first coating chamber 121 and a second coating chamber 122 are introduced into a waste gas main flow path 100 in a pressurizing way through a first draught fan 130 and a second draught fan 140, the waste gas main flow path 100 passes through a first heat exchanger 310 and a second heat exchanger 320 to perform heat convection with heat flow generated in the front stage of a DTO combustion furnace, so that the organic waste gas is heated to about 550 ℃ and is input into the DTO combustion furnace 400, the DTO combustion furnace 400 cracks the organic waste gas to release heat (about 750 ℃) under the combustion supporting of a fuel gas medium and generates clean hot air comprising water vapor and carbon dioxide, the hot air is cooled to about 600 ℃ through the first heat exchanger 310, a cooling fan 311 supplies air to a conveying air source generated by the DTO combustion furnace 400 to cool and exchange heat and supplement balanced hot air flow, then the temperature is reduced to about 480 ℃ through the second heat exchanger 320, the airflow distributor 510 selectively distributes heat flows into the hot air loop 200 and the exhaust flow path 500, the hot air fan 210 guides the heat flows into the hot air loop 200, and the hot air branch 200 guides the heat flows into the coating line baking box group 600, the processing chamber 221 and the drying chamber 222; in the exhaust flow path 500, the second exhaust flow path 120 exchanges heat through the third heat exchanger 330, the temperature is raised and heated to about 220 ℃, the pretreatment sub-tank 700(40 ℃) circularly exchanges heat with the fourth heat exchanger 340 through the water heat exchange flow path 710, the temperature is raised and heated to about (70 ℃), the exhaust flow path 500 outputs heat flow of about 250 ℃, and the heat flow is guided by the exhaust fan 520 to be discharged to the outside from the exhaust port 530, so that the heat utilization rate can be effectively improved, the heat source is saved, the economic effect is high, and the exhaust gas is thoroughly treated.

The spontaneous combustion point of the organic waste gas is basically below 650 ℃ (mainly comprising 586-650 ℃ of benzene, 550-600 ℃ of toluene, 490-550 ℃ of xylene, 462 ℃ of isophorone, 480-550 ℃ of ethyl acetate, 322 ℃ of butyl formate, 520-580 ℃ of cyclohexanone and 550-615 ℃) and the controlled cracking temperature is about 750 ℃ and the cracking time of the waste gas in a high-temperature environment is about 1 second, so that the full cracking of the organic waste gas is powerfully ensured, no peculiar smell generated by emission of the equipment around a factory can be ensured, and the monitoring by a local environmental protection department is realized.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.