Polyester production waste gas purification treatment device

Abstract

The utility model discloses a waste gas purification treatment device for polyester production, comprising a spray dust removal device, a primary adsorption device, a secondary adsorption device and a catalytic combustion device which are arranged in sequence, and adjacent devices are connected through connecting pipes; the spray dust removal device comprises a dust removal tower, a spray pipe is arranged in the dust removal tower, and a screen is arranged above the spray pipe; the primary adsorption device comprises a primary adsorption tower, the primary adsorption tower is filled with water, a gas dispersion device is arranged at the bottom of the water, and a drying box is arranged above the primary adsorption tower; the secondary adsorption device comprises a secondary adsorption tower, and an activated carbon adsorption layer is arranged in the secondary adsorption tower; the catalytic combustion device comprises a combustion tower, a fresh air blower is arranged on one side of the combustion tower, and a catalyst layer is horizontally arranged in the combustion tower; the utility model can perform multiple treatments such as spraying, adsorption, catalysis and combustion on the waste gas, purify harmful components in the waste gas in all aspects, and improve the purification treatment effect of the waste gas.

Description

Technical Field

[0001] The utility model relates to the technical field of polyester waste gas treatment equipment, in particular to a device for purifying waste gas discharged from polyester production. Background Art

[0002] Polyester produces waste gas during esterification, polycondensation and other reactions. The composition of the waste gas is relatively complex and contains many harmful gases. If it is directly discharged into the atmosphere without treatment, it will have a harmful effect on the environment and human health. Conventional treatment methods include adsorption, combustion and oxidation, but these treatment methods can only purify some harmful gases. The purified gas composition is not comprehensive, and some harmful gases will still be discharged into the atmosphere, causing harm to the environment. Utility Model Content

[0003] The utility model aims to provide a waste gas purification treatment device for polyester production, which can perform multiple treatments such as spraying, adsorption, catalysis, combustion, etc. on the waste gas, comprehensively purify harmful components in the waste gas, and improve the waste gas purification treatment effect.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a polyester production exhaust gas purification treatment device, comprising a spray dust removal device, a primary adsorption device, a secondary adsorption device and a catalytic combustion device arranged in sequence, and adjacent devices are connected through connecting pipes; the spray dust removal device comprises a dust removal tower, an air inlet is arranged at the bottom of the dust removal tower, an air outlet is arranged at the top of the dust removal tower, a spray pipe is arranged in the dust removal tower, and a screen is arranged above the spray pipe; the primary adsorption device comprises a primary adsorption tower, the primary adsorption tower is filled with water, a gas dispersion device is arranged at the bottom of the water, the gas dispersion device is connected with the connecting pipe, and a drying box is arranged above the primary adsorption tower; the secondary adsorption device comprises a secondary adsorption tower, a partition is horizontally arranged in the secondary adsorption tower, the lower part of the partition is the air inlet space, the upper part of the partition is the adsorption space, and the adsorption space is provided with an activated carbon adsorption layer; an electric heater is arranged between the secondary adsorption device and the catalytic combustion device, the catalytic combustion device comprises a combustion tower, a fresh air blower is arranged on one side of the combustion tower, a catalyst layer is horizontally arranged in the combustion tower, the lower part of the catalyst layer is the combustion zone, and the upper part of the catalyst layer is the emission zone.

[0005] Optionally, the spray pipe is arranged in a ring shape, and multiple layers of spray pipes are arranged in the dust removal tower.

[0006] Optionally, the gas dispersion device comprises a hollow dispersion plate, and a plurality of dispersion holes are evenly formed on the top of the dispersion plate.

[0007] Optionally, two secondary adsorption towers are provided in the secondary adsorption device, and purification main pipes are provided at the outlets of the two secondary adsorption towers.

[0008] Optionally, the activated carbon adsorption layer includes a multi-layered activated carbon mesh.

[0009] Optionally, a heat exchanger is provided at the outlet of the combustion tower.

[0010] The polyester production waste gas purification treatment device of the utility model has the following advantages:

[0011] (1) The waste gas first passes through a spray dust removal device to remove impurities such as dust and oil mist in the waste gas. Then the waste gas passes through a primary adsorption device. Part of the waste gas can be dissolved in water. After being dried, the waste gas enters a secondary adsorption device. The activated carbon can adsorb the organic components in the waste gas. Finally, the waste gas is catalytically burned in a combustion tower and finally decomposed into carbon dioxide and water and discharged into the environment.

[0012] (2) Multi-layer spray pipes can increase the coverage of spray water and improve the effect of spray dust removal.

[0013] (3) The dispersion disk can expand the contact area between the exhaust gas and water, allowing the exhaust gas to better dissolve in the water.

[0014] (4) The two secondary adsorption towers can be used alternately to improve the continuous working capacity of the purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a structural diagram of the dispersion disk.

[0017] Figure 3 It is a schematic diagram of the structure of the activated carbon mesh. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] like Figure 1-Figure 3 As shown, the polyester production exhaust gas purification treatment device includes a spray dust removal device, a primary adsorption device, a secondary adsorption device and a catalytic combustion device arranged in sequence, and the adjacent devices are connected by a connecting pipe 21. The spray dust removal device includes a dust removal tower 1, an air inlet is arranged at the bottom of the dust removal tower 1, and an air outlet is arranged at the top of the dust removal tower 1. The dust removal tower 1 is provided with a multi-layer spray pipe 2, and the spray pipe 2 is arranged in an annular shape. A screen 3 is arranged above the spray pipe 2. The exhaust gas enters from the bottom of the dust removal tower 1, and dust, oil mist and other impurities in the exhaust gas are removed by spraying. The screen 3 can further filter particulate impurities in the exhaust gas.

[0020] The primary adsorption device includes a primary adsorption tower 4, which is filled with water to absorb soluble gases in the exhaust gas. A gas dispersion device is provided at the bottom of the water. The gas dispersion device includes a hollow dispersion plate 5, and a plurality of dispersion holes 6 are evenly provided on the top of the dispersion plate 5. The dispersion plate 5 is connected to the connecting pipe 21. The exhaust gas after preliminary filtration overflows from the dispersion holes 6 into the water. The dispersion plate 5 can expand the contact area between the exhaust gas and the water, so that the exhaust gas can be better dissolved in the water. A drying box 7 is provided above the primary adsorption tower 4. The exhaust gas having a high moisture content after passing through the primary adsorption tower 4 can absorb the moisture in the exhaust gas.

[0021] Because the waste gas treatment capacity of the secondary adsorption tower 8 is relatively large, two parallel secondary adsorption towers 8 are arranged in the secondary adsorption device, and a purification main pipe 13 is arranged at the outlet of the two secondary adsorption towers 8. Only one secondary adsorption tower 8 is used during normal operation, and the two secondary adsorption towers 8 can be switched with each other to improve the continuous working capacity of the purification device. A partition 9 is horizontally arranged in the secondary adsorption tower 8, and the air intake space 10 is below the partition 9, and the adsorption space 11 is above the partition 9. A plurality of connecting holes are provided on the partition 9, and an activated carbon adsorption layer is arranged in the adsorption space 11. The activated carbon adsorption layer has a multi-layered activated carbon net 12, and the contact area between the activated carbon net 12 and the waste gas is relatively large, which can effectively adsorb the organic components in the waste gas.

[0022] An electric heater 14 is provided on the purification main pipe 13 between the secondary adsorption device and the catalytic combustion device. The electric heater 14 can preheat the exhaust gas. The catalytic combustion device includes a combustion tower 15. A fresh air blower 16 is provided on one side of the combustion tower 15. A catalyst layer 17 is horizontally provided in the combustion tower 15. Below the catalyst layer 17 is a combustion zone 18, and above the catalyst layer 17 is an emission zone 19. The preheated exhaust gas is mixed with fresh air in the combustion zone 18, and then the temperature of the combustion zone 18 is increased to cause catalytic combustion of the exhaust gas and decompose it into carbon dioxide and water. A heat exchanger 20 is provided at the outlet of the combustion tower 15 to cool the gas after combustion and finally discharge it into the atmosphere.

[0023] The waste gas is firstly sprayed to remove dust, oil mist and other impurities in the waste gas, and then subjected to primary adsorption to remove soluble components in the waste gas. After drying, it is subjected to secondary adsorption. The activated carbon can adsorb organic components in the waste gas. Finally, the waste gas is catalytically burned in the combustion tower 15 and finally decomposed into carbon dioxide and water and discharged into the atmosphere. The combination of multiple treatment methods can comprehensively purify harmful components in the waste gas and improve the purification treatment effect of the waste gas.

[0024] The embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

Claims

1. A waste gas purification device for polyester production, characterized by: It comprises a spray dust removal device, a primary adsorption device, a secondary adsorption device and a catalytic combustion device which are arranged in sequence, and adjacent devices are connected by connecting pipes; the spray dust removal device comprises a dust removal tower, an air inlet is arranged at the bottom of the dust removal tower, an air outlet is arranged at the top of the dust removal tower, a spray pipe is arranged in the dust removal tower, and a screen is arranged above the spray pipe; the primary adsorption device comprises a primary adsorption tower, the primary adsorption tower is filled with water, a gas dispersion device is arranged at the bottom of the water, the gas dispersion device is connected with the connecting pipe, and a drying box is arranged above the primary adsorption tower; the secondary adsorption device comprises a secondary adsorption tower, a partition is horizontally arranged in the secondary adsorption tower, the lower part of the partition is the air intake space, the upper part of the partition is the adsorption space, and the adsorption space is provided with an activated carbon adsorption layer; an electric heater is arranged between the secondary adsorption device and the catalytic combustion device, the catalytic combustion device comprises a combustion tower, a fresh air blower is arranged on one side of the combustion tower, a catalyst layer is horizontally arranged in the combustion tower, the lower part of the catalyst layer is the combustion zone, and the upper part of the catalyst layer is the emission zone.

2. The polyester production waste gas purification treatment device according to claim 1, characterized in that: The spray pipes are arranged in a ring shape, and multiple layers of spray pipes are arranged in the dust removal tower.

3. The polyester production waste gas purification treatment device according to claim 1, characterized in that: The gas dispersion device comprises a hollow dispersion plate, and a plurality of dispersion holes are evenly opened on the top of the dispersion plate.

4. The polyester production waste gas purification treatment device according to claim 1, characterized in that: Two secondary adsorption towers are arranged in the secondary adsorption device, and purification main pipes are arranged at the outlets of the two secondary adsorption towers.

5. The polyester production waste gas purification treatment device as claimed in claim 4, characterized in that: The activated carbon adsorption layer includes a multi-layered activated carbon mesh.

6. The polyester production waste gas purification treatment device according to claim 1, characterized in that: A heat exchanger is arranged at the outlet of the combustion tower.

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