Volatile organic compound treatment system of polyester device

Abstract

The utility model discloses a volatile organic compound treatment system of a polyester device, which belongs to the field of polyester production and comprises four pipelines. The first pipeline is formed by connecting a heating medium storage tank, a heating medium lower tank, a gas-phase heating medium emptying condenser and a first flame arrester through pipelines; the second pipeline is formed by connecting an ester sampling port, a solution filter, a second flame arrester, a third flame arrester and an incinerator through pipelines; the third pipeline is formed by connecting an auxiliary agent preparation tank, a PTA / IPA slurry preparation tank, an EG liquid seal tank and a process tower kettle pump filter through pipelines; and the fourth pipeline is formed by connecting a fourth flame arrester, a stripping tower and a natural gas furnace through pipelines. The problem that when volatile organic compounds generated in the production process of equipment of a polyester device are directly discharged into air, large peculiar smell is generated in the device area is solved, and the purposes of energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of polyester production, and in particular to a volatile organic compound treatment system for polyester equipment. Background Technology

[0002] Polyester is a general term for polymers obtained by the condensation polymerization of polyols and polyacids, mainly referring to linear thermoplastic resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyarylates. Its raw materials are mainly substances such as terephthalic acid (PTA), isophthalic acid (IPA), and ethylene glycol (EG).

[0003] Inside the polyester production plant, there are various routine and periodic operations that require switching certain filters to clean their openings, opening and retrieval of liquid seal tanks, sampling of esters, and discharging heat transfer media into storage tanks during plant maintenance. These operations generate volatile organic compounds such as alcohols and aldehydes, solid dust, and heat transfer media gases.

[0004] 1. The PTA / IPA slurry tank is equipped with an observation manhole. During daily production, the end cover is periodically opened to observe the internal slurry mixing process. When opened, volatile organic compounds, such as alcohols, are directly released into the air.

[0005] 2. When the end caps of the ethylene glycol liquid seal tanks connected to each reactor and scraper condenser are opened for routine maintenance and cleaning, volatile organic compounds of alcohol gases will directly escape into the air.

[0006] 3. During routine preparation operations, volatile organic compounds such as alcohols in the catalyst and additive preparation tanks may directly escape into the air.

[0007] 5. When switching and cleaning the filter of the bottom pump connected to the esterification process tower, the filter cap needs to be opened for opening operations, which causes volatile organic compounds containing alcohol gases to be directly released into the air.

[0008] 6. When sampling the esterified products from the first and second esterification reactors, the discharge port on the material pipeline is opened, and the volatile organic compounds containing alcohols carried out during the discharge of the high-temperature melt are directly released into the air.

[0009] 7. During the periodic switching of the melt filter and the removal of the filter element by opening the end cover, volatile organic compounds such as alcohols, aldehydes and polyester melt degradation gases are directly released into the air.

[0010] 8. During daily operation, as the liquid level of the heat medium in the tank rises and falls, volatile organic compounds of the heat medium gas will be directly released into the air through the breather pipe.

[0011] 9. The volatile organic compounds (VOCs) such as aldehydes contained in the esterification wastewater discharged after stripping in the stripping tower of the polyester unit are generally directed to the heat transfer fluid furnace for combustion. If the heat transfer fluid furnace experiences a sudden problem and is interlocked to stop the flow into the furnace, this portion of the VOCs containing aldehydes will be directly discharged into the air through the interlock system.

[0012] When the volatile organic compounds generated during the production process of the aforementioned polyester plant are directly released into the air, they will cause a strong odor in the plant area, resulting in environmental pollution. Utility Model Content

[0013] The purpose of this invention is to provide a volatile organic compound (VOC) treatment system for polyester plants, which solves the problem that when VOCs generated during the production process of polyester plants are directly emitted into the air, they will cause a large odor in the plant area and cause environmental pollution.

[0014] To achieve the above objectives, a volatile organic compound (VOC) treatment system for a polyester plant is provided, characterized by comprising four pipelines;

[0015] The first pipeline consists of a heat medium storage tank, a heat medium low-level tank, a gas phase heat medium venting condenser, and a first flame arrester connected by pipes.

[0016] The second pipeline consists of an ester sampling port, a melt filter, a second flame arrester, a third flame arrester, and an incinerator connected by pipes.

[0017] The third pipeline consists of an auxiliary agent preparation tank, a PTA / IPA slurry preparation tank, an EG liquid seal tank, and a process tower bottom pump filter connected by pipes.

[0018] The fourth pipeline consists of a fourth flame arrester, a stripping tower, and a natural gas furnace connected by pipelines.

[0019] The first pipeline inlet is located between the second and third flame arresters;

[0020] The third pipeline inlet is located between the melt filter and the second flame arrester;

[0021] The stripping tower and the natural gas furnace are connected. One end of the fourth flame arrester is set on the pipeline between the second and third flame arresters, and the other end is set on the pipeline between the stripping tower and the natural gas furnace. A blower is installed on the incinerator.

[0022] Safety valves are installed above the ester sampling port, melt filter, auxiliary agent preparation tank, PTA / IPA slurry preparation tank and EG liquid seal tank;

[0023] Collection hoods are installed above the ester sampling port, melt filter, auxiliary agent preparation tank, PTA / IPA slurry preparation tank, EG liquid seal tank, and melt filter. Safety valves are also installed above the ester sampling port, melt filter, auxiliary agent preparation tank, PTA / IPA slurry preparation tank, and EG liquid seal tank.

[0024] The collection hood has a square or arc-shaped structure.

[0025] Compared with existing technologies:

[0026] All types of volatile organic compounds generated in the polyester unit are collected and classified before being introduced into the incinerator for combustion. Flame arresters are installed on each gas supply branch to prevent the risk of explosion caused by external sparks. The incinerator's fan is used as the suction power, eliminating the need for additional power equipment and reducing electricity consumption. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0028] Figure 1 This is a schematic diagram of a volatile organic compound treatment system for a polyester device according to the present invention. Detailed Implementation

[0029] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0030] Reference Figure 1 A volatile organic compound treatment system for a polyester plant, characterized in that it comprises four pipelines;

[0031] The first pipeline consists of a heat medium storage tank 1.1, a heat medium low-level tank 1.2, a gas phase heat medium venting condenser 1.3, and a first flame arrester 1.4 connected by pipes.

[0032] The second pipeline consists of an ester sampling port 2.1, a melt filter 2.2, a second flame arrester 2.3, a third flame arrester 2.4, and an incinerator 2.5 connected by pipes. A blower 2.6 is installed on the incinerator 2.5.

[0033] The third pipeline consists of the auxiliary agent preparation tank 3.1, the PTA / IPA slurry preparation tank 3.2, the EG liquid seal tank 3.3, and the process tower bottom pump filter 3.4 connected by pipes;

[0034] The fourth pipeline consists of the fourth flame arrester 4.1, the stripping tower 4.2, and the natural gas furnace 4.3 connected by pipelines;

[0035] The first pipeline inlet is located between the second flame arrester 2.3 and the third flame arrester 2.4;

[0036] The third pipeline inlet is located between the melt filter 2.2 and the second flame arrester 2.3;

[0037] The stripping tower 4.2 and the natural gas furnace 4.3 are connected. One end of the fourth flame arrester 4.1 is installed on the pipeline between the second flame arrester 2.3 and the third flame arrester 2.4, and the other end is installed on the pipeline between the stripping tower 4.2 and the natural gas furnace 4.3.

[0038] Safety valves are installed above the esterification sampling port 2.1, the melt filter 2.2, the auxiliary agent preparation tank 3.1, the PTA / IPA slurry preparation tank 3.2, and the EG liquid seal tank 3.3;

[0039] A collection hood 4 is installed above the ester sampling port 2.1, the melt filter 2.2, the auxiliary agent preparation tank 3.1, the PTA / IPA slurry preparation tank 3.2, the EG liquid seal tank 3.3, and the melt filter 2.2. Safety valves are installed above the ester sampling port 2.1, the melt filter 2.2, the auxiliary agent preparation tank 3.1, the PTA / IPA slurry preparation tank 3.2, and the EG liquid seal tank 3.3. The collection hood 4 has a square or arc-shaped structure.

[0040] Working principle;

[0041] A collection hood 4 is installed above the ester sampling port 2.1 and the melt filter 2.2. Before operation, the safety valve is opened and the collection hood 4 is placed above or to the side of the safety valve where volatile organic compounds are released. The collected volatile organic compounds enter the incinerator 2.5 for incineration after passing through the second flame arrester 2.3 and the third flame arrester 2.4. The fan 2.6 of the incinerator 2.5 provides suction.

[0042] 3. The auxiliary agent preparation tank 3.1, PTA / IPA slurry preparation tank 3.2, and EG liquid seal tank 3.3 are also equipped with a collection hood 4 above them. Before operation, the safety valve is opened, and the collection hood 4 is placed above or to the side of the safety valve where volatile organic compounds are released. The collected volatile organic compounds enter the incinerator 2.5 for incineration after passing through the second flame arrester 2.3 and the third flame arrester 2.4. The fan 2.6 of the incinerator 2.5 provides suction.

[0043] 4. The fourth flame arrester 4.1 is installed on the pipeline between the second flame arrester 2.3 and the third flame arrester 2.4 at one end, and on the pipeline between the stripping tower 4.2 and the natural gas furnace 4.3 at the other end. In the event of an emergency discharge caused by an accident in the stripping tower 4.2, the volatile organic compounds will directly pass through the fourth flame arrester 4.1 and enter the incinerator 2.5 for combustion. The blower 2.6 of the incinerator 2.5 provides suction.

[0044] Volatile organic compounds from the polyester plant are introduced into an incinerator or heat transfer furnace for incineration and then discharged after being treated to meet emission standards.

[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A volatile organic compound (VOC) treatment system for a polyester plant, characterized in that, Includes four pipelines; The first pipeline consists of a heat medium storage tank (1.1), a heat medium low-level tank (1.2), a gas phase heat medium venting condenser (1.3), and a first flame arrester (1.4) connected by pipes. The second pipeline consists of an ester sampling port (2.1), a melt filter (2.2), a second flame arrester (2.3), a third flame arrester (2.4), and an incinerator (2.5) connected by pipes. A blower (2.6) is installed on the incinerator (2.5). The third pipeline consists of an auxiliary agent preparation tank (3.1), a PTA / IPA slurry preparation tank (3.2), an EG liquid seal tank (3.3), and a process tower bottom pump filter (3.4) connected by pipes. The fourth pipeline consists of the fourth flame arrester (4.1), the stripping tower (4.2), and the natural gas furnace (4.3) connected by pipelines; The first pipeline inlet is located between the second flame arrester (2.3) and the third flame arrester (2.4); The third pipeline inlet is located between the melt filter (2.2) and the second flame arrester (2.3); The stripping tower (4.2) and the natural gas furnace (4.3) are connected. One end of the fourth flame arrester (4.1) is set on the pipeline between the second flame arrester (2.3) and the third flame arrester (2.4), and the other end is set on the pipeline between the stripping tower (4.2) and the natural gas furnace (4.3). Safety valves are installed above the ester sampling port (2.1), melt filter (2.2), auxiliary agent preparation tank (3.1), PTA / IPA slurry preparation tank (3.2), and EG liquid seal tank (3.3); A collection hood (4) is installed above the ester sampling port (2.1), melt filter (2.2), auxiliary agent preparation tank (3.1), PTA / IPA slurry preparation tank (3.2), EG liquid seal tank (3.3), and melt filter (2.2). Safety valves are installed above the ester sampling port (2.1), melt filter (2.2), auxiliary agent preparation tank (3.1), PTA / IPA slurry preparation tank (3.2), and EG liquid seal tank (3.3).

2. The volatile organic compound treatment system for a polyester plant according to claim 1, characterized in that, The collection cover (4) has a square or arc-shaped structure.

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