Flue gas gradient treatment device for asphalt processing

Abstract

The utility model discloses a flue gas gradient treatment device for asphalt processing, which comprises a condensation purification tank, an industrial condenser is arranged on the rear side of the condensation purification tank, and a sectional type condensation pipeline is arranged in an inner cavity of the condensation purification tank; the condensation purification tank comprises a tank body, end covers fixedly connected to the left and right end sections of the tank body, and supporting legs fixed to the bottom surface of the tank body in a left-right mirror symmetry mode. According to the scheme, the industrial condenser is connected with the 4-5 cold traps, differential low-temperature sources are provided for the independent spaces divided by the partition plates, a gradient temperature field from the smoke inlet end to the smoke outlet end is formed, and efficient condensation of pollutants with different boiling points in the corresponding temperature intervals is achieved; the annular array manifold is matched with the 2-3 layers of annular pipes to form a three-dimensional heat exchange network, the smoke retention time is prolonged, the contact area is increased, high-boiling-point pollutants are preferentially condensed in the high-temperature section, and low-boiling-point pollutants are treated in the low-temperature section.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas condensation and purification equipment, specifically to a flue gas gradient treatment device for asphalt processing. Background Technology

[0002] In the production of recycled asphalt, high-temperature flue gas contains complex pollutants such as asphalt fumes, polycyclic aromatic hydrocarbons, and volatile organic compounds, with a wide range of boiling points. Traditional condensation purification devices employ single-stage cooling or simple piping structures; however, existing devices are mostly integral cooling tanks with uniform internal temperature distribution, failing to create a gradient temperature field. This results in high-boiling-point pollutants not being fully condensed in the low-temperature zone, while low-boiling-point pollutants are not effectively captured in the high-temperature zone, leading to low overall purification efficiency. Furthermore, traditional single-pipe or planar serpentine piping designs result in short flue gas residence times and limited contact area between hot and cold fluids. In light of these shortcomings in asphalt flue gas condensation purification, this paper proposes a gradient treatment device for asphalt processing flue gas to address these issues. Utility Model Content

[0003] The purpose of this utility model is to provide a technical solution for a flue gas gradient treatment device for asphalt processing, so as to overcome the shortcomings mentioned in the background art. To address the drawbacks and defects described in the background art, this technical solution includes the following:

[0004] It includes a condensation purification tank, an industrial condenser is provided on the rear side of the condensation purification tank, and a segmented condensation pipeline is provided in the inner cavity of the condensation purification tank.

[0005] The condensation purification tank includes a tank body, end caps fixedly connected to the left and right ends of the tank body, and support feet fixedly to the bottom surface of the tank body in a left-right mirror symmetrical manner.

[0006] The segmented condenser pipeline includes a flue gas inlet pipe and a flue gas outlet pipe. The flue gas inlet pipe and the flue gas outlet pipe are each branched and fixedly connected to 8-10 manifolds at their respective ends. The manifolds are arranged in a ring array with the axis of the flue gas inlet pipe and the flue gas outlet pipe as the base point.

[0007] The manifold has 2-3 annular tubes arranged in a linear array inside. A liquid collection tube is connected to the bottom surface of the annular tubes. 2-3 partition plates are fitted on the outer ring of the manifold to divide the inner cavity of the tank into 4-5 sections.

[0008] As a preferred embodiment of this utility model, the condenser output end of the industrial condenser is connected to 4-5 cold traps, and the cold traps are respectively connected to 4-5 spaces in the inner cavity of the tank.

[0009] In a preferred embodiment of this utility model, the inner cavities of the flue gas inlet pipe, the manifold, and the flue gas outlet pipe are interconnected.

[0010] In a preferred embodiment of this utility model, the outer surface of the partition plate is fixed to the inner wall of the tank.

[0011] As a preferred embodiment of this utility model, the partition plate is provided with through holes for the manifold to pass through, and a sealing ring is filled between the inside of the through holes and the outer ring of the manifold.

[0012] As a preferred embodiment of this utility model, the partition plate is made of fiberglass board or foam board, and is used to separate the cold air circulation in 4-5 spaces inside the tank.

[0013] In a preferred embodiment of this utility model, the annular tube is annular in shape, and the inner cavity of the annular tube is interconnected with the inner cavity of the manifold.

[0014] In a preferred embodiment of this utility model, the bottom end of the liquid collection pipe extends out from the bottom of the inner cavity of the tank.

[0015] As a preferred embodiment of this utility model, the inner center of the end cap is provided with circular holes for the flue gas inlet pipe and the flue gas outlet pipe to pass through.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0017] This solution uses an industrial condenser to connect 4-5 cold traps, providing a differentiated low-temperature source for each independent space divided by partitions, forming a gradient temperature field from the flue gas inlet to the outlet, enabling efficient condensation of pollutants with different boiling points in their corresponding temperature ranges; the annular array manifold, together with 2-3 layers of annular tubes, forms a three-dimensional heat exchange network, extending the flue gas residence time and increasing the contact area, so that the high-temperature section preferentially condenses high-boiling-point pollutants, while the low-temperature section treats low-boiling-point pollutants. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of an asphalt fume condensation and purification equipment.

[0020] Figure 2 This is a schematic diagram of a segmented condensate purification tank;

[0021] Figure 3 This is a schematic diagram of the internal piping of a segmented condensation purification tank.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Condensation purification tank; 11. Tank body; 12. End cap; 13. Support foot; 2. Industrial condenser; 3. Segmented condensation piping; 31. Flue gas inlet pipe; 32. Manifold; 33. Partition plate; 34. Flue gas outlet pipe; 35. Circular pipe; 36. Liquid collection pipe. Detailed Implementation

[0024] To provide a clearer explanation and description of the technical solution and implementation of this utility model, several preferred specific embodiments for implementing the technical solution of this utility model are introduced below.

[0025] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of each embodiment. Specific details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures. The disclosures of various publications, patents, and published patent specifications cited herein are incorporated herein by reference in their entirety. The technical solutions of this utility model will be clearly and completely described below in conjunction with embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model.

[0026] Refer to the instruction manual appendix Figure 1 As shown, a gradient treatment device for asphalt processing flue gas consists of a condensation purification tank 1 and an industrial condenser 2. The condensation purification tank 1 achieves multi-stage condensation of the flue gas through internal segmented condensation pipes 3, while the industrial condenser 2 provides a cold source and precisely controls the temperature through a cold trap, ultimately achieving segmented purification of the asphalt flue gas and collection of condensate.

[0027] The tank body 11 is a cylindrical structure with end caps 12 bolted to both ends. A circular hole is opened in the center of each end cap for pipes to pass through. Support legs 13 are symmetrically welded to the bottom of the tank body 11 and reinforced with triangular ribs. A rubber sealing gasket is placed between the end caps 12 and the tank body 11 to prevent gas leakage. In the segmented condenser piping layout 3, the flue gas inlet pipe 31 and the flue gas outlet pipe 34 horizontally pass through the end caps 12 on the left and right sides of the tank body 11. Their ends branch and connect to 8-10 manifolds 32, which are arranged in a ring array with the main pipe axis as the base point. Two to three partition plates 33, preferably made of fiberglass, are fitted around the outer ring of each manifold 32. The partition plates 33 divide the inner cavity of the tank body 11 into 4-5 independent spaces, each space corresponding to a temperature control zone of a cold trap. The partition plates 33 are fitted over the manifolds 32 through through-holes filled with high-temperature resistant sealing rings to ensure spatial isolation. Furthermore, each manifold 32 contains 2-3 annular pipes 35 running axially through it. The annular pipes 35 are connected to the manifold 32, and a conical liquid collection pipe 36 is welded to the bottom. The liquid collection pipe 36 extends to the bottom of the tank 11 and passes through to connect to an external collection container. In addition, the annular pipe 35 adopts a spiral coil design to increase the condensation contact area, and refrigerant is introduced into it.

[0028] The industrial condenser 2 cools the refrigerant to the required condensation temperature via a refrigeration unit. Its outlet connects to 4-5 independent cold trap pipelines, each leading to a corresponding partitioned space within the tank 11. The cold traps are made of copper tubing and attached to the surface of the partition plate 33. Temperature control in different spaces is achieved by adjusting the refrigerant flow rate in each cold trap. The partition plate 33 is made of thick fiberglass board, providing both insulation and corrosion resistance. Its through-hole diameter is larger than the outer diameter of the manifold 32, and it is internally filled with silicone sealing rings. The cold traps within each space are arranged in an S-shape to improve heat exchange efficiency.

[0029] The working process of a flue gas gradient treatment device for asphalt processing is as follows:

[0030] High-temperature asphalt fumes are injected through the fumes inlet pipe 31 by an external induced draft fan. Eight to ten manifolds 32 at the end of the inlet pipe 31 are arranged in a ring array. Before entering the tank, the fumes are pre-cooled by the industrial condenser 2 to prevent direct impact of high temperatures on the condensation structure inside the tank. After entering different sections of the manifolds 32, the condensation temperature provided by the cold trap decreases in a gradient, achieving a gradient condensation effect and targeting pollutants with different boiling points through staged cooling. A polytetrafluoroethylene coating is sprayed onto the inner wall of the ring pipe 35 to prevent high-viscosity liquids from adhering and clogging at low temperatures. After the condensate forms a liquid film inside the ring pipe 35, it flows downwards along the pipe wall to the conical collection pipe 36, where it is accelerated for discharge by utilizing the slope. A U-shaped liquid seal is installed at the outlet of the collection pipe 36 to prevent backflow of external air; simultaneously, a rotary centrifuge is connected to the end of the collection pipe 36 to further separate small droplets entrained in the gas and liquid. The condensate is collected in an external storage tank. After being heated and stratified, the upper layer of light oil is reused, while the lower layer of heavy tar is sent for hazardous waste treatment. The gas output from the flue gas discharge pipe 34 enters the activated carbon adsorption tower. Finally, after the gas passes the online monitoring, it is discharged through the exhaust stack.

[0031] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A gradient treatment device for flue gas in asphalt processing, comprising a condensation purification tank (1), characterized in that: An industrial condenser (2) is provided on the rear side of the condensation purification tank (1), and a segmented condensation pipeline (3) is provided in the inner cavity of the condensation purification tank (1). The condensation purification tank (1) includes a tank body (11), end caps (12) fixedly connected to the left and right ends of the tank body (11), and support feet (13) fixedly on the bottom surface of the tank body (11) in a mirror image symmetrical manner. The segmented condenser pipeline (3) includes a flue gas inlet pipe (31) and a flue gas outlet pipe (34). The flue gas inlet pipe (31) and the flue gas outlet pipe (34) are each branched and fixedly connected to 8-10 manifolds (32) at their respective ends. The manifolds (32) are arranged in a ring array with the axis of the flue gas inlet pipe (31) and the flue gas outlet pipe (34) as the base point. The manifold (32) has 2-3 annular tubes (35) arranged in a linear array inside. The bottom surface of the annular tubes (35) is connected to a liquid collection tube (36). The outer ring of the manifold (32) is fitted with 2-3 partition plates (33) to divide the inner cavity of the tank (11) into 4-5 sections.

2. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The condenser (2) of the industrial condenser is connected to 4-5 cold traps at its condensation output end, and the cold traps are respectively connected to 4-5 spaces in the inner cavity of the tank (11).

3. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The internal spaces of the flue gas inlet pipe (31), manifold (32) and flue gas outlet pipe (34) are interconnected.

4. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The outer surface of the partition plate (33) is fixed to the inner wall of the tank body (11).

5. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The partition plate (33) has through holes for the manifold (32) to pass through, and a sealing ring is filled between the inside of the through hole and the outer ring of the manifold (32).

6. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The partition plate (33) is made of fiberglass board or foam board and is used to separate the cold air circulation in 4-5 spaces inside the tank (11).

7. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The annular tube (35) is annular, and the inner cavity of the annular tube (35) is interconnected with the inner cavity of the manifold (32).

8. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The bottom end of the liquid collection pipe (36) extends out from the bottom of the inner cavity of the tank (11).

9. The flue gas gradient treatment device for asphalt processing according to claim 1, characterized in that: The end cap (12) has a circular hole at its center for the flue gas inlet pipe (31) and the flue gas outlet pipe (34) to pass through.

Images