High-temperature oxidation blacking production line with waste heat recovery and exhaust gas purification functions

Abstract

The utility model belongs to high temperature oxidation blackening production line technical field discloses high temperature oxidation blackening production line with waste heat recovery and waste gas purification function, including feeding mechanism, oxidation furnace and cooling tank connected in proper order, and the exhaust port of oxidation furnace is connected with preheating recovery purification unit, preheating recovery purification unit includes spiral flow guide heat exchange pipe, inertial separation chamber, catalytic oxidation bed and hot air circulation pipe, and spiral flow guide heat exchange pipe, inertial separation chamber and catalytic oxidation bed are connected in proper order through connecting flange, and hot air circulation pipe is linked with one side of catalytic oxidation bed, and the inner wall of spiral flow guide heat exchange pipe is equipped with spoiler, and the pipe of spiral flow guide heat exchange pipe is wound with cooling water pipe, the utility model discloses a spiral flow guide heat exchange pipe cooling water system and hot air circulation reuse mechanism are used, and high temperature waste gas heat energy is converted into cooling water heat energy and drying / combustion -supporting hot air, so as to improve comprehensive energy utilization rate, and the problem of energy waste caused by traditional process direct emptying is solved simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of high-temperature oxidation and blackening production lines, and in particular to a high-temperature oxidation and blackening production line with waste heat recovery and exhaust gas purification functions. Background Technology

[0002] A high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions refers to an automated production system that integrates metal surface treatment technology with energy-saving and environmental protection technology. It generates a dense iron tetroxide (Fe3O4) protective film (blackening treatment) on the metal surface through a high-temperature oxidation reaction (usually at 300–500℃).

[0003] Traditional high-temperature oxidation and blackening production lines have the following problems: 1) Energy waste: The 600-800℃ high-temperature exhaust gas emitted from the oxidation furnace is directly discharged into the air, resulting in low thermal energy utilization.

[0004] 2) Severe pollution: The exhaust gas contains oil mist, acidic gases (such as NOx and SOx) and unburned carbon particles. Existing purification equipment mostly uses independent spray towers, which consumes a lot of energy and cannot be treated in a coordinated manner. Therefore, we have proposed a high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions. Utility Model Content

[0005] In view of the problems of energy waste and serious pollution in the existing high-temperature oxidation blackening production line, this utility model is proposed.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] A high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions includes a feeding mechanism, an oxidation furnace and a cooling tank connected in sequence, and the exhaust port of the oxidation furnace is connected to a preheating recovery and purification unit.

[0008] The preheating, recovery, and purification unit includes a spiral heat exchange tube, an inertial separation chamber, a catalytic oxidation bed, and a hot air circulation pipe. The spiral heat exchange tube, the inertial separation chamber, and the catalytic oxidation bed are connected in sequence via connecting flanges, and the hot air circulation pipe is connected to one side of the catalytic oxidation bed.

[0009] As the technical solution of the high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions described in this utility model, wherein: the inner wall of the spiral flow heat exchange tube is provided with staggered baffles, the outside of the spiral flow heat exchange tube is wrapped with a cooling water pipe, and both ends of the cooling water pipe are connected to an external cooling system.

[0010] As the technical solution of the high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions described in this utility model, the spacing between adjacent baffles is 0.3-0.5 times the diameter of the spiral flow heat exchange tube, the surface of the baffles is provided with a nano oleophobic coating, and the thickness of the nano oleophobic coating is 50-80μm.

[0011] As the technical solution of the high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions described in this utility model, wherein: a spiral guide vane is installed on the inner wall of the inertial separation chamber, and the spiral angle of the spiral guide vane gradually decreases along the flow direction.

[0012] As the technical solution of the high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions described in this utility model, the catalytic oxidation bed is equipped with a honeycomb ceramic carrier, the surface of the honeycomb ceramic carrier is coated with a ternary catalyst, and the pore density of the honeycomb ceramic carrier is ≥300 mesh / in 2 .

[0013] As the technical solution of the high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions described in this utility model, the hot air circulation pipe is connected to the air inlet of the oxidation furnace and the auxiliary drying port of the cooling tank respectively through a three-way valve.

[0014] As the technical solution of the high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions described in this utility model, the bottom of the catalytic oxidation bed has an inclined bottom trough, and the lowest point of the bottom trough is connected to an external waste liquid treatment device through a U-shaped water seal.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. This utility model, by adopting a spiral flow heat exchanger cooling water system and a hot air circulation and reuse mechanism, converts the heat energy of high-temperature waste gas into the heat energy of cooling water and the drying / combustion hot air, thereby improving the overall energy utilization rate and solving the energy waste problem caused by the direct discharge of traditional processes.

[0017] 2. This utility model, through the combination of inertial separation, catalytic oxidation and oleophobic anti-clogging design, can achieve integrated purification of oil mist, NOx / SOx and carbon particles, thereby improving the overall removal rate of pollutants and replacing traditional high-energy-consuming spray towers to reduce operating energy consumption. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0021] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

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

[0023] In the figure: 1. Spiral heat exchange tube; 101. Turbulence vane; 102. Cooling water pipe; 2. Inertial separation chamber; 201. Spiral guide vane; 3. Catalytic oxidation bed; 301. Honeycomb ceramic carrier; 302. Bottom tank; 4. Hot air circulation pipe; 401. Three-way valve; 5. U-shaped water seal. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Reference Figures 1-3 A high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions is provided. This high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions includes a feeding mechanism, an oxidation furnace and a cooling tank connected in sequence. The exhaust port of the oxidation furnace is connected to a preheating recovery and purification unit.

[0026] The preheating and purification unit includes a spiral heat exchanger 1, an inertial separation chamber 2, a catalytic oxidation bed 3, and a hot air circulation pipe 4. The spiral heat exchanger 1, the inertial separation chamber 2, and the catalytic oxidation bed 3 are connected sequentially via connecting flanges. The hot air circulation pipe 4 is connected to one side of the catalytic oxidation bed 3. The overall layout consists of a feeding mechanism, an oxidation furnace, a spiral heat exchanger 1, an inertial separation chamber 2, a catalytic oxidation bed 3, and a cooling tank. The hot air circulation pipe 4 extends from the outlet of the catalytic oxidation bed 3, with branch pipes covering the oxidation furnace and the cooling tank. In application, the series design of the spiral heat exchanger 1, the inertial separation chamber 2, the catalytic oxidation bed 3, and the hot air circulation pipe 4 achieves the synergistic operation of waste heat recovery and purification. At the same time, the spiral heat exchanger 1 initially recovers the heat energy of the high-temperature waste gas, the inertial separation chamber 2 separates large particulate pollutants, the catalytic oxidation bed 3 degrades harmful gases, and the hot air circulation pipe 4 reuses the purified hot air, comprehensively improving energy utilization and environmental performance.

[0027] Reference Figure 1 and Figure 2 The inner wall of the spiral heat exchange tube 1 is provided with staggered baffles 101. The outer side of the spiral heat exchange tube 1 is wrapped with a cooling water pipe 102, and both ends of the cooling water pipe 102 are connected to the external cooling system (factory circulating cooling water system). In application, the baffles 101 increase the degree of airflow turbulence and enhance the heat exchange efficiency. At the same time, the cooling water pipe 102 converts the waste heat into usable cooling water heat energy and directly recovers the heat of the 600-800℃ waste gas to improve the heat energy utilization rate.

[0028] Reference Figure 2 and Figure 3 The spacing between adjacent baffles 101 is 0.3-0.5 times the diameter of the spiral heat exchange tube 1. The surface of the baffles 101 is provided with a nano-oleophobic coating with a thickness of 50-80μm. In application, the optimized spacing of the baffles 101 (0.3-0.5 times the tube diameter) can avoid flow dead zones. At the same time, the nano-oleophobic coating reduces oil mist adhesion, reduces the risk of pipe blockage, and ensures long-term stable heat exchange efficiency.

[0029] Reference Figure 2 and Figure 3 The inner wall of the inertial separation chamber 2 is equipped with a spiral guide vane 201, and the spiral angle of the spiral guide vane 201 gradually decreases along the flow direction (from 45° to 15°). In application, the spiral angle of the spiral guide vane 201 is designed to form a gradually narrowing flow field, which accelerates the accumulation of particles towards the chamber wall. Combined with the principle of inertial separation, it can improve the removal rate of carbon particles.

[0030] Reference Figure 2 and Figure 3The catalytic oxidation bed 3 contains a honeycomb ceramic support 301, the surface of which is coated with a ternary catalyst, and the pore density of the honeycomb ceramic support 301 is ≥300 mesh / in. 2 In applications, high porosity honeycomb ceramic carrier 301 (≥300 mesh / in) 2 Increasing the reaction contact area and using ternary catalysts (such as Pt-Pd-Rh) to efficiently catalyze the oxidation and decomposition of NOx, SOx and unburned carbon particles can improve the conversion rate of acidic gases.

[0031] Reference Figure 1 and Figure 2 The hot air circulation pipe 4 is connected to the air inlet of the oxidation furnace and the auxiliary drying port of the cooling tank through the three-way valve 401. In application, the hot air circulation pipe 4 returns the purified hot air to the oxidation furnace (preheating and combustion aid) and the cooling tank (auxiliary drying) through the three-way valve 401 to reduce fuel consumption and shorten the drying time of the workpiece.

[0032] Reference Figure 2 and Figure 3 The bottom of the catalytic oxidation bed 3 has an inclined bottom tank 302 (slope of 5°). The lowest point of the bottom tank 302 is connected to an external waste liquid treatment device (waste liquid pool) through a U-shaped water seal 5. In application, the combined design of the inclined bottom tank 302 and the U-shaped water seal 5 can collect the condensed waste liquid generated by the catalytic reaction and discharge it in a sealed manner, while preventing secondary volatilization and pollution of acidic waste liquid, thus achieving harmless treatment.

[0033] The working principle of this utility model is as follows: Preheating start-up: Oxidation furnace ignition: Turn on the oxidation furnace, and start the preheating recovery and purification unit after the waste gas temperature reaches 600℃.

[0034] Preheating of catalytic oxidation bed 3: The catalytic oxidation bed 3 is preheated to 300℃ (catalyst ignition temperature) by an electric heater;

[0035] Production Operation: Waste Gas Treatment: High-temperature waste gas enters the spiral guide heat exchanger 1, exchanges heat with the cooling water pipe 102, and is cooled to 250-300℃. The gas flow passes through the inertial separation chamber 2, where large carbon dust particles are thrown against the chamber wall and collected. The remaining gas enters the catalytic oxidation bed 3, where NOx / SOx is oxidized and decomposed into CO2, H2O, and N2 under the action of the catalyst.

[0036] Waste heat recovery: After purification, the hot air (about 200°C) is divided into four streams through the hot air circulation pipe. Most of it (70%) is returned to the air inlet of the oxidation furnace to aid combustion and save energy, while a small portion (30%) is introduced into the cooling tank to accelerate the drying of the workpiece.

[0037] Waste liquid treatment: The acidic condensate generated by the catalytic reaction flows into the U-shaped water seal 5 along the bottom tank 302 and is periodically discharged to the neutralization tank;

[0038] Shutdown maintenance: Turn off the oxidation furnace, and after the system cools down, stop the purification unit, clean the carbon deposits in the inertial separation chamber 2, check the wear of the nano oleophobic coating, and use external compressed air to backflush the honeycomb ceramic carrier 301 every once in a while to prevent pore blockage.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions, comprising a feeding mechanism, an oxidation furnace, and a cooling tank connected in sequence, characterized in that: The exhaust port of the oxidation furnace is connected to a preheating recovery and purification unit; The preheating recovery and purification unit includes a spiral heat exchange tube (1), an inertial separation chamber (2), a catalytic oxidation bed (3), and a hot air circulation pipe (4). The spiral heat exchange tube (1), the inertial separation chamber (2), and the catalytic oxidation bed (3) are connected in sequence through a connecting flange. The hot air circulation pipe (4) is connected to one side of the catalytic oxidation bed (3).

2. The high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions according to claim 1, characterized in that: The inner wall of the spiral heat exchange tube (1) is provided with staggered baffles (101), and a cooling water pipe (102) is wound around the outside of the spiral heat exchange tube (1), and both ends of the cooling water pipe (102) are connected to an external cooling system.

3. The high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions according to claim 2, characterized in that: The spacing between adjacent baffles (101) is 0.3-0.5 times the diameter of the spiral heat exchange tube (1). The surface of the baffles (101) is provided with a nano oleophobic coating, and the thickness of the nano oleophobic coating is 50-80 μm.

4. The high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions according to claim 1, characterized in that: The inner wall of the inertial separation cavity (2) is equipped with a spiral guide vane (201), and the spiral angle of the spiral guide vane (201) gradually decreases along the flow direction.

5. The high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions according to claim 1, characterized in that: The catalytic oxidation bed (3) is internally provided with a honeycomb ceramic carrier (301), the surface of the honeycomb ceramic carrier (301) is coated with a three-way catalyst, and the pore density of the honeycomb ceramic carrier (301) is ≥ 300 mesh / in 2 .

6. The high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions according to claim 1, characterized in that: The hot air circulation pipe (4) is connected to the air inlet of the oxidation furnace and the auxiliary drying port of the cooling tank respectively through a three-way valve (401).

7. The high-temperature oxidation blackening production line with waste heat recovery and exhaust gas purification functions according to claim 1, characterized in that: The bottom of the catalytic oxidation bed (3) has an inclined bottom trough (302), and the lowest point of the bottom trough (302) is connected to an external waste liquid treatment device through a U-shaped water seal (5).

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