A regenerative combustion system for fluctuating water soluble vocs exhaust sources

Abstract

This invention provides a regenerative thermal combustion system for fluctuating water-soluble VOCs waste gas sources, including an inlet pipe, a pretreatment device, a filter device, and a regenerative thermal combustion device. The inlet end of the pretreatment device is connected to the outlet end of the inlet pipe, the outlet end of the pretreatment device is connected to the inlet end of the filter device, and the outlet end of the filter device is connected to the inlet end of the regenerative thermal combustion device. The pretreatment device includes at least one absorbent liquid tank filled with absorbent liquid. A heating device is also provided in the pretreatment device to heat the absorbent liquid, thereby releasing the adsorbed water-soluble VOCs. The regenerative thermal combustion system further includes a gas detector and a liquid level sensor. The gas detector is installed at least at both the inlet and outlet ends of the pretreatment device, and the liquid level sensor is installed on the inner wall of the absorbent liquid tank. This invention achieves "peak shaving and valley filling" pretreatment for fluctuating water-soluble VOCs waste gas sources.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, specifically relating to a regenerative combustion system for fluctuating water-soluble VOCs waste gas sources. Background Technology

[0002] Volatile organic compounds (VOCs) are a major source of air pollution, and their emissions pose serious threats to the environment and human health. Water-soluble VOCs, such as methanol and ethanol, have high solubility in waste gas and often exist in a mixture of gaseous and liquid states. They are particularly common in key industries such as pharmaceuticals, chemicals, and petrochemicals. These industries have complex production processes, are often intermittent, and result in significant fluctuations in VOC waste gas volume and emission concentration, as well as complex compositions, making them difficult to treat.

[0003] Traditional combustion treatment systems such as RTO, RCO, and CO treatment equipment suffer from problems such as unstable combustion efficiency, high energy consumption, and secondary pollution when treating this type of waste gas. Especially when the waste gas concentration fluctuates significantly, the combustion system struggles to adjust effectively, leading to poor treatment results. Specifically, when the waste gas concentration is too low, the heat generated during combustion in the RTO is low, requiring additional fuel or electricity consumption and resulting in higher operating costs; when the waste gas concentration exceeds 25% of the lower explosive limit of VOCs, the system cannot promptly treat the excessively concentrated waste gas, thus posing a risk of combustion and explosion.

[0004] CN119123440A discloses a novel pretreatment process for high-concentration waste gas incineration in the hazardous waste industry, comprising the following steps: Step 1, waste gas enters a liquid-sealed system; Step 2, the liquid-sealed system treats the waste gas; Step 3, vacuum desorption; Step 4, waste gas recovery and liquid-sealing agent regeneration; Step 5, RTO system treatment. This invention uses a liquid-sealed system to treat waste gas according to its concentration, reducing the concentration of high-concentration waste gas and increasing the concentration of low-concentration waste gas. Its drawbacks include the inability to dynamically and precisely control the amount of gas adsorbed and desorbed in the liquid-sealed system, the need for separate desorption of the liquid-sealed system, resulting in high operating costs and reduced treatment efficiency. It also cannot continuously treat large volumes of waste gas, and its treatment effect on fluctuating VOCs waste gas does not meet expectations. Utility Model Content

[0005] The purpose of this invention is to address the problem in existing technologies where the concentration of water-soluble VOCs in waste gas from key industries fluctuates greatly, affecting the safety and stability of RTO systems. Therefore, this invention provides a regenerative thermal combustion system for fluctuating water-soluble VOCs waste gas sources.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A regenerative thermal combustion system for fluctuating water-soluble VOCs waste gas sources includes an air inlet pipe, a pretreatment device, a filter device, and a regenerative thermal combustion device. The inlet end of the pretreatment device is connected to the outlet end of the air inlet pipe, the outlet end of the pretreatment device is connected to the inlet end of the filter device, and the outlet end of the filter device is connected to the inlet end of the regenerative thermal combustion device.

[0008] The pretreatment device is equipped with at least one absorbent liquid tank, which is filled with absorbent liquid.

[0009] The pretreatment device is equipped with a heating device, which is used to heat the absorbent liquid to release the water-soluble VOCs adsorbed in the absorbent liquid.

[0010] The regenerative combustion system also includes a gas detector and a liquid level sensor. The gas detector is installed at least at the inlet and outlet of the pretreatment device, and the liquid level sensor is installed on the inner wall of the absorption liquid tank.

[0011] Furthermore, the absorbent liquid includes water, glycerin, white oil, and N-methylpyrrolidone.

[0012] Furthermore, the gas detector located at the outlet of the pretreatment device detects that the gas concentration is lower than the set value and activates the heating device.

[0013] Specifically, the set value is the minimum concentration required to maintain the self-heating combustion of the regenerative combustion device. The specific value is set according to the composition, concentration ratio, and calorific value of the exhaust gas source.

[0014] Furthermore, the liquid-to-gas ratio of the pretreatment device during operation is <4L / m³. 3 The air velocity in the empty tower is <2m / s, and the residence time of the exhaust gas is >2s.

[0015] Furthermore, the filtration device includes a main frame and a housing. The housing is disposed outside the main frame. An air inlet is integrally formed at the inlet end of the housing, and an air outlet is integrally formed at the outlet end of the housing. At least one mounting bracket is disposed on the main frame. The plane of the mounting bracket is perpendicular to the gas flow direction, and a filter screen is fixed on the mounting bracket.

[0016] Furthermore, the filtration device also includes a differential pressure gauge, and interfaces are respectively provided on the side walls of the housing at corresponding positions on both sides of the filter screen. The differential pressure gauge is installed on the outer wall of the housing through the interfaces.

[0017] Furthermore, the mounting frame is composed of several mounting compartments arranged in a window-like pattern, and the frame of each mounting compartment is provided with spring clips, through which the filter screen is mounted in the mounting compartment.

[0018] Furthermore, at least one inspection door is provided on the side of the housing at the corresponding position of the mounting bracket.

[0019] Furthermore, the distance between the mounting bracket near the air inlet and the air inlet is greater than 800mm, the distance between the mounting brackets is greater than 800mm, and the distance between the mounting bracket near the air outlet and the air outlet is greater than 600mm.

[0020] Furthermore, the gas flow rate during operation of the filtration device is ≤2.5m / s.

[0021] The beneficial effects of this utility model are:

[0022] (1) This utility model achieves “peak shaving and valley filling” pretreatment for fluctuating water-soluble VOCs waste gas sources through a reasonably set pretreatment system, ensuring that the waste gas entering the regenerative combustion device is always maintained within the concentration range that meets self-heating and safety requirements, reducing system energy consumption while ensuring system safety; stable combustion conditions further improve the waste gas purification efficiency and avoid the environmental risk problem caused by emergency emission of waste gas source concentration exceeding 1 / 4 of the explosion limit.

[0023] (2) The regenerative combustion system of this utility model achieves precise dynamic control of the amount of waste gas adsorbed and the amount of slow release in the pretreatment system through the design and synergistic effect of different structures. While ensuring the safety and stability of the regenerative combustion system, it avoids the high-cost process of recycling the waste gas after the pretreatment device is oversaturated. It realizes the simplified design of the regenerative combustion pretreatment system, saves treatment steps, shortens the working conditions, and is suitable for long-term uninterrupted operation of fluctuating VOCs waste gas sources, reducing the number of shutdowns for treatment or maintenance.

[0024] (3) The regenerative combustion system and its control method of this utility model solve the environmental and safety risks caused by large fluctuations in the concentration of water-soluble waste gas in key industries such as pharmaceuticals, chemicals and petrochemicals, greatly improve the purification efficiency of the combustion system, reduce the investment cost and operating energy consumption of the system, and can be applied to the treatment of extremely large volumes of waste gas.

[0025] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0026] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0027] The accompanying drawings are not drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings. The embodiments in the drawings do not constitute any limitation on the present invention. Other drawings can be obtained by those skilled in the art based on the following drawings without inventive effort:

[0028] Figure 1 This is a schematic diagram of the regenerative combustion system for fluctuating water-soluble VOCs waste gas sources provided by this utility model.

[0029] Figure 2 This is a schematic diagram of the housing of the filter device provided by this utility model;

[0030] Figure 3 This is a schematic diagram of the internal structure of the filtration device provided by this utility model.

[0031] Legend:

[0032] 1. Air intake pipe; 2. Pretreatment device; 3. Filter device; 31. Air inlet; 32. Air outlet; 33. Main frame; 34. Inspection door; 35. Mounting bracket; 36. Mounting grid; 37. Lifting ring; 4. Regenerative combustion device; 5. Collecting fan; 6. Exhaust stack. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0034] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "a," "one," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0035] Example 1

[0036] See attached document Figure 1 This utility model provides a regenerative combustion system for fluctuating water-soluble VOCs waste gas sources, including an air inlet pipe 1, a pretreatment device 2, a filtration device 3, and a regenerative combustion device 4.

[0037] The inlet end of the intake pipe 1 is connected to the exhaust gas source, the outlet end of the intake pipe 1 is connected to the inlet end of the pretreatment device 2, the outlet end of the pretreatment device 2 is connected to the inlet end of the filter device 3 through a pipe, the outlet end of the filter device 3 is connected to the inlet end of the regenerative combustion device 4 through a pipe, and the outlet end of the regenerative combustion device 4 is connected in sequence to a collecting fan 5 and an exhaust stack 6 for discharging the gas after combustion.

[0038] Pretreatment device 2 uses a pretreatment absorption tower, specifically a packed tower.

[0039] The pretreatment device 2 is equipped with at least one absorbent pool, which is filled with absorbent liquid. Depending on the type of waste gas source, water, glycerin, white oil, N-methylpyrrolidone, etc. can be selected as absorbent liquid.

[0040] Pretreatment unit 2 operates with a liquid-to-gas ratio of <4L / m³ 3 The air velocity in the empty tower is <2m / s, and the residence time of the exhaust gas is >2s.

[0041] The pretreatment device 2 is equipped with a heating device at the bottom. Specifically, an electric heater or thermal resistor is installed at the bottom of the absorption liquid tank. The heating temperature range is 40-80℃. It is used to heat the absorption liquid to release the water-soluble VOCs adsorbed in the absorption liquid.

[0042] The liquid level sensor is installed on the inner wall of the absorption liquid tank. The specific model is WA600 water level alarm sensor, which can sound an alarm when the water level of the absorption liquid in the absorption liquid tank reaches a preset value, reminding the user to discharge the absorption liquid.

[0043] In some optional embodiments, the pretreatment device 2 and the absorption liquid pool are provided with corresponding interfaces, and the liquid level sensor is installed on the outer wall of the pretreatment device 2 through the interface to detect and view the liquid level of the absorption liquid.

[0044] The pretreatment device 2 is equipped with interfaces that serve as a drain outlet and a water inlet. The water inlet is connected to a water inlet pipe, through which the absorbent enters the pretreatment device 2. The drain outlet is connected to a drain pipe, through which the absorbent leaves the pretreatment device 2.

[0045] The pretreatment device 2 is equipped with gas detectors at both its inlet and outlet ends to detect parameters such as exhaust gas concentration and air volume. The gas detectors can be PID, FID, FAT, LEL, etc.

[0046] In some optional embodiments, the pretreatment device 2 is provided with several absorbent pools, each filled with absorbent liquid, and an electric heater is installed at the bottom of each absorbent pool. Based on the detection results of the gas detector at the outlet of the pretreatment device 2, the number and temperature of the electric heaters are adjusted to achieve more precise slow release of waste gas.

[0047] In some optional embodiments, the pretreatment device 2 is provided with several absorbent pools. Each absorbent pool is filled with different types of absorbent according to the type of waste gas in the waste gas source, so that different types of waste gas can be absorbed in a targeted manner. Each absorbent pool is equipped with an electric heater at the bottom. Electric heaters with different power are selected according to the adsorption capacity of different types of absorbent. The number and temperature of the electric heaters are adjusted according to the detection results of the gas detector at the outlet of the pretreatment device 2 to achieve more precise waste gas slow release.

[0048] See attached document Figure 2 In this embodiment, the filter device 3 includes a main frame 33 and a box. The box is provided outside the main frame 33. An air inlet 31 is integrally formed at the inlet end of the box, and an air outlet 32 ​​is integrally formed at the outlet end of the box. Gas flows from the air inlet 31 to the air outlet 32.

[0049] See attached document Figure 3 The main frame 33 is provided with two mounting brackets 35. The plane of the mounting bracket 35 is perpendicular to the gas flow direction. The first mounting bracket is close to the air inlet 31, and the second mounting bracket is close to the air outlet 32. The mounting bracket 35 is composed of several mounting grids 36 arranged in a window-like pattern. Each mounting grid 36 is individually equipped with a filter screen.

[0050] Specifically, window pane layouts include a framework system composed of repetitive geometric units, such as rectangles, rhombuses, hexagons, and other regular shapes, which are orthogonally or obliquely intersected to form a visually or functionally modular division.

[0051] The main frame 33 is made of carbon steel and is fixed by welding hollow square tubes. The frame edges of the mounting bracket 35 and mounting grid 36 are equipped with spring clips. The filter screen is installed in the rectangular mounting grid 36 via these spring clips, facilitating installation and removal. The filter screen is made of hydrophilic material or has a surface coated with a hydrophilic material.

[0052] The distance between the first mounting bracket and the air inlet 31 is greater than 800mm, the distance between the first mounting bracket and the second mounting bracket is greater than 800mm, and the distance between the second mounting bracket and the air outlet 32 ​​is greater than 600mm.

[0053] When the filter device 3 is running, the gas flow rate is ≤2.5m / s.

[0054] The sides of the housing at the corresponding positions of the first and second mounting brackets are respectively provided with inspection doors 34, which limit the distance between the mounting brackets 35, so as to provide space for maintenance personnel to enter for inspection or replacement of the filter.

[0055] The access door 34 uses a rotary switch, and the door panel and the outer frame of the access door 34 are wrapped with rubber to ensure a tight seal when closed.

[0056] The filter device 3 is also equipped with a differential pressure gauge. Each filter screen has an interface on the side wall of the housing at the corresponding position on the front and back sides. The differential pressure gauge is installed on the outer wall of the housing through two corresponding interfaces.

[0057] The filter device 3 has two drain ports at the bottom and is equipped with a manual ball valve.

[0058] The filter unit 3 has four lifting rings 37 on its outer casing for easy hoisting and use.

[0059] The working principle of the regenerative combustion system for fluctuating water-soluble VOCs waste gas sources provided in this embodiment is as follows:

[0060] The exhaust gas enters the pretreatment device 2 from the intake pipe 1. When the exhaust gas concentration is high, the pretreatment device 2 absorbs the water-soluble VOCs in the exhaust gas and stores some of the water-soluble VOCs in the pretreatment device 2. The high-concentration exhaust gas is adsorbed by the pretreatment device 2 to ensure its safety and stability, and maintains it within a safe concentration range that can maintain the self-heating combustion of the regenerative combustion device 4 without producing explosion hazards, thus achieving "peak shaving" treatment of high-concentration exhaust gas.

[0061] The minimum safe concentration range is the minimum concentration required to maintain the self-heating combustion of the regenerative combustion device 4. The specific value is set according to the composition, concentration ratio and calorific value of the exhaust gas source. The maximum is 1 / 4 LEL, where LEL is the minimum explosive limit of exhaust gas, which is the minimum concentration limit at which exhaust gas will explode when it encounters an open flame in the air.

[0062] When the exhaust gas concentration is low, water-soluble VOCs stored in the absorbent are released and concentrated by normal temperature stripping. If the slow release amount of conventional stripping is insufficient to maintain the self-heating of the regenerative combustion device 4 or the exhaust gas storage in the pretreatment device 2 is insufficient, the heating device is turned on to slowly release the exhaust gas stored in the pretreatment device 2 to concentrate the exhaust gas source, ensuring that the exhaust gas concentration entering the regenerative combustion device 4 can maintain its self-heating combustion, and realizing the "valley filling" treatment of low-concentration exhaust gas.

[0063] If the gas detector detects that the concentration of the desorbed waste gas is insufficient, the heating temperature of the electric heater will be increased until the lowest value of the safe concentration range is reached; if the gas detector detects that the concentration of the desorbed waste gas is too high, the electric heater will be turned off or the heating temperature will be reduced, thereby reducing the waste gas concentration at the outlet of the pretreatment device 2.

[0064] By adjusting the temperature rise and fall of the electric heater based on the concentration of exhaust gas before and after the pretreatment device 2 detected by the gas detector, the amount of exhaust gas adsorption and desorption can be precisely controlled.

[0065] To ensure the absorption effect of the absorbent, the absorbent in the pretreatment device 2 is replaced regularly. The old liquid is discharged through the drain pipe and transported to the sewage treatment device for treatment. The new liquid enters the pretreatment device 2 through the inlet pipe. The amount of absorbent added is controlled by the liquid level sensor. When the liquid level rises abnormally due to a malfunction of the pretreatment device 2, the drain pipe is opened to discharge the absorbent.

[0066] The exhaust gas after passing through the pretreatment device 2 enters the filter device 3 through the air inlet 31. The filter device 3 filters out particulate matter and water mist in the exhaust gas. The exhaust gas passes through multiple layers of filter screens in the filter device 3, passes through the air outlet 32, and then enters the heat storage combustion device 4. After combustion, it is discharged through the collecting fan 5 and the exhaust pipe 6.

[0067] The pressure difference before and after the filter can be detected by the differential pressure gauge corresponding to the filter. When the pressure difference increases to the set value, the filter needs to be replaced. The maintenance personnel enter the box through the maintenance door 34 to check the equipment and replace the filter. If water is deposited in the box of the filter device 3, the ball valve is opened to drain the accumulated liquid from the drain port at the bottom of the box.

[0068] Example 2

[0069] A regenerative thermal combustion system for fluctuating water-soluble VOCs waste gas sources, as described in Example 1, uses water as the absorbent in the pretreatment device 2. The system has a dynamic adsorption capacity of 35 mg / g for reversible adsorption-desorption and a liquid-to-gas ratio of 3 L / m³ during operation. 3 The air velocity in the empty tower is 1.5 m / s, and the residence time is 2.5 s.

[0070] The regenerative combustion device 4 is a three-chamber RTO.

[0071] The gas detector is of type FID, model HPGC-1000LEL, used to detect gas concentration; the liquid level sensor is model MAT, 4~20mA DC; the differential pressure gauge is model TK3051.

[0072] The distance between the first mounting bracket and the air inlet 31 is 1000mm, the distance between the first mounting bracket and the second mounting bracket is 1000mm, the distance between the second mounting bracket and the air outlet 32 ​​is 800mm, and the size of a single filter screen is 610mm x 610mm.

[0073] When the filter device 3 is running, the gas flow rate is 2.0 m / s and the residence time is 2.5 s.

[0074] When the regenerative combustion system operates at normal temperature and pressure, the concentration of VOCs in the exhaust gas source is between 100-12000 mg / m³. 3 The concentration of the exhaust gas fluctuates within a certain range, and after treatment by pretreatment device 2, the concentration is 3000-4000 mg / m³. 3 The entire system operated stably for more than a week without any abnormalities. During this period, the absorbent in the pretreatment device 2 was replaced every 24 hours, and the exhaust gas from the regenerative combustion device 4 met environmental protection requirements.

[0075] Example 3

[0076] A regenerative thermal combustion system for fluctuating water-soluble VOCs waste gas sources, as described in Example 1, uses water as the absorbent in the pretreatment device 2. The system has a dynamic adsorption capacity of 35 mg / g for reversible adsorption-desorption and a liquid-to-gas ratio of 3 L / m³ during operation. 3 The air velocity in the empty tower is 1.5 m / s, and the residence time is 2.5 s.

[0077] The regenerative combustion device 4 is a three-chamber RTO.

[0078] The gas detector is of type FID, model HPGC-1000LEL, used to detect gas concentration; the liquid level sensor is model MAT, 4~20mA DC; the differential pressure gauge is model TK3051.

[0079] The distance between the first mounting bracket and the air inlet 31 is 1200mm, the distance between the first mounting bracket and the second mounting bracket is 1200mm, the distance between the second mounting bracket and the air outlet 32 ​​is 800mm, and the size of a single filter screen is 610mm x 610mm.

[0080] When the filter device 3 is running, the gas flow rate is 2.0 m / s and the residence time is 2.5 s.

[0081] When the regenerative combustion system operates at normal temperature and pressure, the concentration of VOCs in the exhaust gas source is between 500 and 50,000 mg / m³. 3 The concentration of the exhaust gas fluctuates within a certain range, and after treatment by pretreatment device 2, the concentration is 3000-6000 mg / m³. 3 The entire system operated stably for more than a week without any abnormalities. During this period, the absorbent in the pretreatment device 2 was replaced every 24 hours, and the exhaust gas from the regenerative combustion device 4 met environmental protection requirements.

[0082] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the scope of the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

[0083] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. Technical details not described in detail in this utility model can all be implemented by any existing technology in the art. In particular, all technical features not described in detail in this utility model can be implemented by any existing technology.

Claims

1. A regenerative combustion system for a fluctuating aqueous VOCs exhaust source, characterized by, The regenerative combustion system includes an air intake pipe, a pretreatment device, a filter device, and a regenerative combustion device. The inlet end of the pretreatment device is connected to the outlet end of the air intake pipe, the outlet end of the pretreatment device is connected to the inlet end of the filter device, and the outlet end of the filter device is connected to the inlet end of the regenerative combustion device. The pretreatment device is equipped with at least one absorbent liquid tank, which is filled with absorbent liquid. The pretreatment device is equipped with a heating device, which is used to heat the absorbent liquid to release the water-soluble VOCs adsorbed in the absorbent liquid. The regenerative combustion system also includes a gas detector and a liquid level sensor. The gas detector is installed at least at the inlet and outlet of the pretreatment device, and the liquid level sensor is installed on the inner wall of the absorption liquid tank.

2. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 1, wherein, The absorbent liquids include water, glycerin, white oil, and N-methylpyrrolidone.

3. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 1, wherein, The gas detector located at the outlet of the pretreatment device detects that the gas concentration is lower than the set value and starts the heating device.

4. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 1, wherein, The pre-treatment device operates with a liquid-gas ratio < 4 L / m 3 , a superficial gas velocity < 2 m / s and a waste gas residence time > 2 s.

5. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 1, wherein, The filtration device includes a main frame and a housing. The housing is located outside the main frame. An air inlet is integrally formed at the inlet end of the housing, and an air outlet is integrally formed at the outlet end of the housing. At least one mounting bracket is provided on the main frame. The plane of the mounting bracket is perpendicular to the gas flow direction, and a filter screen is fixed on the mounting bracket.

6. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 5, wherein, The filtration device also includes a differential pressure gauge. Interfaces are provided on the side walls of the housing at corresponding positions on both sides of the filter screen. The differential pressure gauge is installed on the outer wall of the housing through the interface.

7. A regenerative combustion system for fluctuating water-soluble VOCs waste gas sources according to claim 5, characterized in that, The mounting bracket consists of several mounting compartments arranged in a window-like pattern. The edges of the mounting compartments are provided with spring clips, and the filter screen is installed in the mounting compartments through the spring clips.

8. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 5, wherein, At least one inspection door is provided on the side of the housing corresponding to the mounting bracket.

9. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 5, wherein, The distance between the mounting bracket near the air inlet and the air inlet is greater than 800mm, the distance between the mounting brackets is greater than 800mm, and the distance between the mounting bracket near the air outlet and the air outlet is greater than 600mm.

10. The regenerative combustion system for fluctuating water soluble VOCs waste gas source of claim 5, wherein, The gas flow rate of the filtration device is ≤2.5m / s during operation.

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