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CN-121971955-A - Exhaust gas purification equipment for PE pipe production line

CN121971955ACN 121971955 ACN121971955 ACN 121971955ACN-121971955-A

Abstract

The application relates to the technical field of waste gas treatment equipment, and discloses waste gas purification equipment for PE pipe production lines, which comprises a zeolite rotating wheel, wherein the zeolite rotating wheel comprises a front cylinder and a rear cylinder, the front cylinder and the rear cylinder are respectively and movably connected with a front rotating wheel and a rear rotating wheel which keep rotating, a separation cavity is arranged between the rear rotating wheel and the front rotating wheel, a front adsorption cavity, a front desorption cavity and a front cooling cavity are arranged between the front cylinder and the separation cavity, a rear adsorption cavity, a rear desorption cavity and a rear cooling cavity are arranged between the separation cavity and the rear cylinder, the front adsorption cavity and the rear adsorption cavity are connected in series, and the end part of the front adsorption cavity is communicated with waste gas through an adsorption pipe. This exhaust gas purification equipment for PE tubular product production line adopts tandem type double-runner structure, and preferential adsorption and bear high boiling point pollutant through preceding runner, cooperates adjustable internal reflux and differential rotational speed design, when solving zeolite pore and blockked up the problem, has promoted the concentration multiple of low concentration waste gas by a wide margin, has ensured the steady self-heating operation of catalytic oxidation stove.

Inventors

  • LIU HUIBO
  • ZHENG MINGHUA
  • ZHOU ZHIBIN
  • YE ZHIYONG

Assignees

  • 安徽塑沣电子科技有限公司

Dates

Publication Date
20260505
Application Date
20260319

Claims (8)

  1. 1. The waste gas purifying equipment for the PE pipe production line comprises a zeolite rotating wheel, wherein the zeolite rotating wheel comprises a front cylinder (1) and a rear cylinder (2), and is characterized in that the front cylinder (1) and the rear cylinder (2) are respectively and movably connected with a front rotating wheel (4) and a rear rotating wheel (3) which keep rotating, a separation cavity (5) is arranged between the rear rotating wheel (3) and the front rotating wheel (4), a front adsorption cavity, a front desorption cavity and a front cooling cavity are arranged between the front cylinder (1) and the separation cavity (5), and a rear adsorption cavity, a rear desorption cavity and a rear cooling cavity are arranged between the separation cavity (5) and the rear cylinder (2); The front adsorption cavity and the rear adsorption cavity are connected in series, the end part of the front adsorption cavity is communicated with waste gas through an adsorption pipe (6), and the outlet of the rear adsorption cavity is communicated with a discharge port; The zeolite runner still includes cold air pipe (7), hot air pipe (8) and concentrate pipe (9), cooling chamber before the air flow in cold air pipe (7), back desorption chamber entry all communicates with hot air pipe (8), preceding desorption chamber export and concentrate pipe (9) intercommunication, concentrate pipe (9) intercommunication has catalytic oxidation stove, preceding desorption chamber export and back desorption chamber exit linkage have manifold (10), and manifold (10) can be with the air current transport to preceding cooling chamber export.
  2. 2. An exhaust gas purifying apparatus for a PE pipe production line according to claim 1, characterized in that the thickness ratio of the rear runner (3) to the front runner (4) ranges from 0.5 to 1.
  3. 3. The exhaust gas purification device for the PE pipe production line according to claim 1, wherein a distribution valve (11) is arranged on the collecting pipe (10), the distribution valve (11) is a three-way valve, and two outlets of the distribution valve (11) are respectively connected with the concentration pipe (9) and the front cooling cavity outlet.
  4. 4. The exhaust gas purification device for the PE pipe production line according to claim 3, wherein three air grids are arranged at the end part of the front cylinder (1), three or four air grids are arranged on the rear cylinder (2), a plurality of groups of air grids corresponding to the front cylinder (1) or the rear cylinder (2) are respectively arranged on two sides of the separation cavity (5), the front cylinder (1) and the separation cavity (5) are tightly attached to the front rotating wheel (4) to form a front adsorption cavity, a front desorption cavity and a front cooling cavity, and the rear cylinder (2) and the separation cavity (5) are tightly attached to the rear rotating wheel (3) to form a rear adsorption cavity, a rear desorption cavity and a rear cooling cavity.
  5. 5. The exhaust gas purification device for the PE pipe production line according to claim 4, wherein three air grids of the front cylinder (1) are respectively a first cold style (101), a first hot air grid (102) and a first exhaust air grid (103), the rear cylinder (2) is provided with three air grids which correspond to the three air grids of the front cylinder (1) respectively, a second cold style (502), a second hot air grid (503) and a second exhaust air grid (501) are correspondingly arranged on the separation cavity (5), two groups of second hot air grids (503) are axially arranged, two groups of second hot air grids (503) are separated by a partition board, communication ports (504) are respectively arranged on the side walls of the two groups of second hot air grids (503), the communication ports (504) corresponding to the rear desorption cavity are communicated with the manifold (10), and the manifold (10) corresponding to the front desorption cavity is communicated with the hot air pipe (8).
  6. 6. The exhaust gas purifying apparatus for a PE pipe production line according to claim 4, wherein four air cells, namely a third cooling style (201), a third hot air cell (202), a third air cell (203) and a reflux cell (204), are arranged on the rear cylinder (2), the reflux cell (204) is aligned with the first hot air cell (102), and the reflux cell (204) is communicated with the collecting pipe (10).
  7. 7. The exhaust gas purifying apparatus for a PE pipe production line according to claim 6, characterized in that the front wheel (4) is chain-driven with a front driving wheel (13), the rear wheel (3) is chain-driven with a rear driving wheel (12), the diameter ratio of the rear driving wheel (12) and the front driving wheel (13) is larger than two, and the cross-sectional area of the first hot air cell (102) is smaller than the cross-sectional area of the fourth hot air cell (506).
  8. 8. The exhaust gas purification device for a PE pipe production line according to claim 6, wherein the separation chamber (5) comprises a communication grid (505), a fourth hot air grid (506), a fourth cold air grid (507) and a fifth cold air grid (508), the communication grid (505) corresponds to the first hot air grid (102) and the third hot air grid (202) and is in a penetrating state, a partition plate is arranged in the middle of the separation chamber (5), one side of the partition plate is provided with the fourth cold air grid (507), the other side of the partition plate is provided with the fourth hot air grid (506) and the fifth cold air grid (508), the side wall of the fourth cold air grid (507) is provided with an air outlet (509), air in the front cooling chamber flows out of the air outlet (509), the fourth hot air grid (506) is communicated with the hot air pipe (8), and one side of the fifth cold air grid (508) is provided with an air inlet (510), and cooling air enters the fifth cold air grid (508) through the air inlet (510). .

Description

Exhaust gas purification equipment for PE pipe production line Technical Field The application relates to the technical field of waste gas treatment equipment, in particular to waste gas purification equipment for a PE pipe production line. Background In the production process of Polyethylene (PE) pipes, the processes of extrusion molding, vacuum sizing, cooling and the like can generate waste gas containing volatile organic compounds (VOCs, the main component of which is non-methane total hydrocarbon). The waste gas has the typical characteristics of large air quantity, low concentration (generally 50-300 mg/m < 3 >) and strong emission dispersivity. In order to meet the increasingly strict environmental emission standards, a combined process of zeolite rotating wheel concentration combined combustion method (RTO/CO) is widely adopted in the industry at present. The process utilizes the continuous rotary switching of an adsorption zone, a desorption zone and a cooling zone of a zeolite rotating wheel, wherein the adsorption zone captures VOCs in waste gas by a hydrophobic zeolite molecular sieve, purified gas is discharged after reaching standards, the desorption zone desorbs the adsorbed VOCs by high-temperature hot air accounting for 5% -15% of the total air quantity to form concentrated gas with small air quantity and high concentration, the concentrated gas is sent into an oxidation furnace for thorough decomposition, the purification efficiency can reach more than 98%, and the cooling zone recovers the adsorption activity after the rotating wheel is cooled by normal-temperature air and enters the next cycle. However, when actually applied to complex working conditions such as PE pipe production, the existing zeolite runner technology has the following significant defects: First, the plugging and regeneration of micropores by high boiling point components is difficult, and PE process exhaust is often accompanied by small amounts of high boiling point lubricant, oligomers and additive volatiles. After adsorption of these macromolecular substances by zeolites, complete desorption is difficult because the energy supplied by conventional desorption temperatures (typically around 200 ℃) is insufficient to overcome their adsorption barrier. These residues gradually accumulate and plug the inlet ends of zeolite micropores (about 10% -20% of the channel length) over time. The 'inlet end blockage' not only greatly reduces the effective adsorption specific surface area and leads to the rapid reduction of adsorption capacity, but also forms a remarkable thermal resistance barrier on the blocking layer to prevent the heat of desorption hot air from being transferred to the depth of micropores, so that the pollutants adsorbed at the depth are more difficult to desorb and form vicious circle. Even with conventional regenerations, it is difficult to restore rotor performance, resulting in increasingly smaller areas of actual functioning, and exhaust gas can easily penetrate the zeolite rotor, resulting in emissions exceeding the standard. Secondly, the concentration multiple is insufficient under the working condition of extremely low concentration, so that the economic self-heating combustion is difficult to realize. Aiming at the characteristics of large air quantity and extremely low concentration in PE pipe production, the concentration multiple of a conventional zeolite rotating wheel is usually designed to be 10-15 times. Under the multiple, for the waste gas with the initial concentration lower than 100mg/m < 3 >, the concentrated outlet concentration is usually only 1000-1500 mg/m < 3 >, and the concentrated waste gas is at or below the critical value edge of self-heating maintenance concentration of catalytic combustion or thermal storage combustion. This means that the oxidation oven must be frequently turned on with auxiliary fuel (natural gas or electric heating) to maintain the reaction temperature, resulting in a rapid increase in operating energy consumption, losing the economic advantage of energy saving of the concentration process. The existing rotating wheel structure is limited by the balance of desorption air volume ratio and adsorption dynamics, so that the concentration multiple (such as to be more than 20 times) is difficult to be further and greatly improved on the premise of ensuring high removal rate, and the low-cost treatment requirement of the ultra-low concentration waste gas cannot be met. Disclosure of Invention The application provides waste gas purifying equipment for a PE pipe production line, which adopts a serial double-runner structure, preferentially adsorbs and bears high-boiling-point pollutants through a front runner, and is matched with an adjustable internal reflux and differential rotation speed design, so that the problem of zeolite pore canal blockage is solved, the concentration multiple of low-concentration waste gas is greatly improved, and the stable self-heating op