A coating plant waste heat recovery system

Abstract

The utility model relates to a coating workshop technical field, concretely is a kind of coating workshop waste heat recovery system, including molecular sieve concentration runner, CO preheater, desorption heat exchanger, waste heat heat exchanger, main pipeline, molecular sieve export unit, molecular sieve first export line, molecular sieve second export line, CO export line;Desorption heat exchanger with the CO preheater series connection;Main pipeline one end is connected to the multistage filter, the other end is connected to the molecular sieve concentration runner;Molecular sieve export unit one end is connected to the outlet of molecular sieve concentration runner, the other end is connected to the inlet of desorption heat exchanger.It will VOCs processing equipment's waste heat by increasing waste heat utilization unit, pipeline, mixing box and dehumidifier pipeline mixed supply air to workshop, the air of processing first through waste heat utilization unit to improve supply air temperature, make air temperature and humidity have been suitable condition meet coating construction requirement.

Description

Technical Field

[0001] This utility model relates to the field of painting workshop technology, specifically a waste heat recovery system for painting workshops. Background Technology

[0002] Spray painting booths are core areas for surface coating operations in industries such as shipbuilding, automotive, and heavy machinery. The quality of their internal environment, including temperature, humidity, cleanliness, airflow organization, and volatile organic compound (VOC) concentration, directly determines key quality indicators such as paint film leveling, gloss, and adhesion, and is a crucial factor affecting the final appearance and corrosion resistance of the product. Currently, traditional spray painting booth environmental control systems mainly rely on independent air conditioning, exhaust, and waste gas treatment systems. However, this traditional approach has a series of technical problems that urgently need to be addressed: Spray painting booths are high-energy-consuming units. To meet stringent temperature and humidity requirements, the air supply system needs to perform extensive heating, cooling, and dehumidification of the fresh air. Simultaneously, to ensure operational safety and capture overspray, spray painting booths employ high-volume, full-exchange ventilation, resulting in a large amount of treated air that meets process requirements being rapidly expelled from the workshop. The energy consumed in treating this fresh air is also quickly dissipated, causing significant energy waste. Furthermore, the high-temperature waste heat generated during the operation of incineration equipment (such as TAR, RTO, etc.) installed to treat VOCs-containing waste gas is basically not effectively recovered in the existing system and is directly discharged into the atmosphere, further aggravating energy waste and making the operating cost of painting operations extremely high. Utility Model Content

[0003] In view of the deficiencies of the prior art, this utility model provides a waste heat recovery system for a painting workshop. The waste heat of the VOCs treatment equipment is mixed with the air in the workshop by adding a waste heat utilization unit, pipelines, mixing box and dehumidifier pipeline. The treated air is first increased in temperature by the waste heat utilization unit. When the waste heat utilization unit does not meet the air temperature, the variable frequency heat pump unit is used for heating compensation, so that the temperature and humidity in the air are suitable to meet the requirements of painting construction.

[0004] To achieve the above objectives, the technical solution provided by this utility model is a waste heat recovery system for a painting workshop, including a molecular sieve concentrator, a CO preheater, a desorption heat exchanger, a waste heat exchanger, a main pipeline, a molecular sieve outlet unit, a first molecular sieve outlet line, a second molecular sieve outlet line, and a CO outlet line; the desorption heat exchanger is connected in series with the CO preheater; one end of the main pipeline is connected to the multi-stage filter, and the other end is connected to the molecular sieve concentrator; one end of the molecular sieve outlet unit is connected to the outlet of the molecular sieve concentrator, and the other end is connected to the inlet of the desorption heat exchanger; one end of the first molecular sieve outlet line is connected to... The second outlet of the molecular sieve concentrator is connected to the CO preheater via a CO fan; one end of the second outlet line of the molecular sieve is connected to the third outlet of the molecular sieve concentrator, and the other end is connected to the FID online concentration detector via an adsorption fan; one end of the CO outlet line is connected to the top outlet of the CO preheater, and the other end is connected to the FID online concentration detector; a CO branch line is provided on the CO outlet line, and the CO branch line is connected to the inlet of the waste heat exchanger; the first outlet of the waste heat exchanger is connected to the waste heat utilization unit, the second outlet is connected to the CO outlet line, and the third outlet is connected to the waste heat fan.

[0005] Furthermore, a parallel pipeline is provided upstream of the CO blower, which is connected to the CO outlet line.

[0006] Furthermore, the side outlet pipeline of the CO preheater is connected to the combustion chamber.

[0007] Furthermore, the bottom outlet pipeline of the desorption heat exchanger is connected to the catalytic oxidation furnace.

[0008] Furthermore, it also includes a burner inserted into the combustion chamber, one end of which is connected to natural gas and the other end of which is connected to a combustion-supporting fan.

[0009] Furthermore, the first outlet line of the molecular sieve is provided with the crossover line, which is connected to the catalytic oxidation furnace.

[0010] Furthermore, it also includes dehumidifiers, which mix air with waste heat recovery units through a mixing box and send it to several output terminals in the workshop.

[0011] The beneficial effects of this utility model are as follows: the waste heat of the VOCs treatment equipment is mixed with the dehumidifier pipe and sent to the workshop by adding a waste heat utilization unit, pipeline, mixing box and dehumidifier pipeline. The treated air is first increased in temperature by the waste heat utilization unit. When the waste heat utilization unit does not meet the air temperature, the variable frequency heat pump unit is used for heating compensation, so that the temperature and humidity in the air are suitable to meet the requirements of coating construction. Attached Figure Description

[0012] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 Schematic diagram of dehumidifier and waste heat recovery air supply; In the diagram: 100, Molecular sieve concentrator. 200. CO preheater; 210. Combustion chamber. 300. Desorption heat exchanger; 310. Catalytic oxidation furnace. 400. Waste heat exchanger; 410. Waste heat recovery unit; 420. Waste heat fan. 500. Main pipeline; 510. Multi-stage filter. 600, Molecular sieve outlet unit, 700. First outlet line of molecular sieve; 710. Parallel pipeline; 730. Cross-line; 740. CO blower. 800. Second outlet line of molecular sieve; 810. Adsorption fan; 900, CO outlet line; 910, CO branch line. 1000, Burner; 1010, Natural Gas; 1020, Combustion Fan. 1100, Dehumidifier; 1110, Mixing box. Detailed Implementation

[0013] To make the above-mentioned objects, 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. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0014] like Figure 1-3As shown, one embodiment of this utility model discloses a waste heat recovery system for a painting workshop, including a molecular sieve concentrator 100, a CO preheater 200, a desorption heat exchanger 300, a waste heat exchanger 400, a main pipeline 500, a molecular sieve outlet unit 600, a first molecular sieve outlet line 700, a second molecular sieve outlet line 800, and a CO outlet line 900; the desorption heat exchanger 300 and the CO preheater 200 are connected in series; one end of the main pipeline 500 is connected to a multi-stage filter 510, and the other end is connected to the molecular sieve concentrator 100; one end of the molecular sieve outlet unit 600 is connected to the outlet of the molecular sieve concentrator 100, and the other end is connected to the inlet of the desorption heat exchanger 300; one end of the first molecular sieve outlet line 700 is connected to... The second outlet of the molecular sieve concentrator 100 is connected to the CO preheater 200 via a CO blower 740; one end of the second outlet line 800 of the molecular sieve is connected to the third outlet of the molecular sieve concentrator 100, and the other end is connected to the FID online concentration detector via an adsorption blower 810; one end of the CO outlet line 900 is connected to the top outlet of the CO preheater 200, and the other end is connected to the FID online concentration detector; a CO branch line 910 is installed on the CO outlet line 900, and the CO branch line 910 is connected to the inlet of the waste heat exchanger 400; the first outlet of the waste heat exchanger 400 is connected to the waste heat utilization unit 410, the second outlet is connected to the CO outlet line 900, and the third outlet is connected to the waste heat blower 420.

[0015] In one embodiment, a parallel pipeline 710 is provided upstream of the CO blower 740 and connected to the CO outlet line 900.

[0016] In one embodiment, the side outlet line of the CO preheater 200 is connected to the combustion chamber 210.

[0017] In one embodiment, the bottom outlet line of the desorption heat exchanger 300 is connected to the catalytic oxidation furnace 310.

[0018] In one embodiment, a burner 1000 is also included. The burner 1000 is inserted into the combustion chamber 210. One end of the burner 1000 is connected to natural gas 1010, and the other end is connected to a combustion-supporting fan 1020.

[0019] In one embodiment, the molecular sieve first outlet line 700 is provided with a cross line 730, which is connected to the catalytic oxidation furnace 310.

[0020] In one embodiment, a dehumidifier 1100 is also included, which mixes air with the waste heat recovery unit 410 through a mixing box 1110 and sends it to several output terminals in the workshop.

[0021] It should be noted that there are four sets of the waste heat recovery systems described in this application operating simultaneously in the workshop.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A waste heat recovery system for a painting workshop, characterized in that: Includes a molecular sieve concentrator rotor; a CO preheater; a desorption heat exchanger connected in series with the CO preheater; a waste heat heat exchanger; and a main pipeline connected at one end to a multi-stage filter and at the other end to the molecular sieve concentrator rotor. The molecular sieve outlet unit is connected at one end to outlet one of the molecular sieve concentrator and at the other end to the inlet of the desorption heat exchanger; the molecular sieve first outlet line is connected at one end to outlet two of the molecular sieve concentrator and at the other end to the CO preheater via a CO blower. The second outlet line of the molecular sieve is connected at one end to the outlet three of the molecular sieve concentrator, and at the other end to the FID online concentration detector via an adsorption fan; The CO outlet line is connected at one end to the top outlet of the CO preheater and at the other end to the FID online concentration detector; a CO branch line is provided on the CO outlet line, and the CO branch line is connected to the inlet of the waste heat exchanger; the outlet one of the waste heat exchanger is connected to the waste heat utilization unit, the outlet two is connected to the CO outlet line, and the outlet three is connected to the waste heat fan.

2. A waste heat recovery system for a painting workshop according to claim 1, characterized in that: A parallel pipeline is installed upstream of the CO blower and connected to the CO outlet line.

3. A waste heat recovery system for a painting workshop according to claim 1, characterized in that: The side outlet pipeline of the CO preheater is connected to the combustion chamber.

4. A waste heat recovery system for a painting workshop according to claim 1, characterized in that: The bottom outlet pipeline of the desorption heat exchanger is connected to the catalytic oxidation furnace.

5. A waste heat recovery system for a painting workshop according to claim 3, characterized in that: It also includes a burner, which is inserted into the combustion chamber, with one end of the burner connected to natural gas and the other end connected to a combustion-supporting fan.

6. A waste heat recovery system for a painting workshop according to claim 4, characterized in that: The molecular sieve's first outlet line is provided with a crossover line, which is connected to the catalytic oxidation furnace.

7. A waste heat recovery system for a painting workshop according to claim 1, characterized in that: It also includes dehumidifiers, which mix air with waste heat recovery units through a mixing box and send it to several output terminals in the workshop.

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