Unpowered treatment equipment for VOCs escaping from sewage pool in petroleum refining industry

Abstract

The utility model discloses unpowered treatment equipment for VOCs (Volatile Organic Compounds) escaping from a sewage pool in the petroleum refining industry. The unpowered treatment equipment comprises an inner box body, a module drawer device and an exhaust device, the inner box body is sequentially provided with a pretreatment chamber, a deep treatment chamber and a purification chamber from the input side to the output side, the pretreatment chamber is internally provided with a pretreatment unit and is communicated with a sewage pool, and the purification chamber is internally provided with an adsorption treatment unit and is communicated with an exhaust device; the module drawer device comprises a frame body and a drawer, a membrane separation unit is arranged in a bottom-layer cavity, an oxidation desulfurization unit is arranged in a middle-layer cavity, and a catalytic oxidation unit is arranged in a top-layer cavity. By adopting chamber separation and modular design, using a drawer type installation mode and optimizing the internal space and waste gas circulation path of the device, the problem of environmental pollution caused by the fact that waste gas of an oil separation tank, a lifting tank and the like is discharged into the atmosphere is effectively prevented, meanwhile, the occupied area is small, field arrangement is convenient, and the cost is low. And maximization of space utilization and improvement of processing efficiency are realized.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology in the petroleum refining industry, and in particular to a non-powered treatment device for VOCs escaping from wastewater ponds in the petroleum refining industry. Background Technology

[0002] In the wastewater collection and transportation system of the petroleum refining industry, there are a certain number of medium-sized oil separators, booster tanks and other facilities. During the operation of these wastewater tanks, waste gas containing harmful substances such as VOCs will be generated. At present, the main solution is to seal the discharge outlet.

[0003] Although the wastewater discharge outlets are sealed, the volume of exhaust gas generated at these locations is generally large, reaching tens or even hundreds of cubic meters per hour. This makes it impossible to effectively solve the problem of VOCs emission. Even though regulations stipulate that enterprises must treat the exhaust gas discharged from wastewater ponds to meet standards before discharge, in practice, the exhaust gas treatment equipment at these locations is insufficient to meet the high concentration of exhaust gas, resulting in poor treatment effects. Moreover, the power equipment used has high energy consumption, which is not conducive to cost reduction and efficiency improvement for enterprises. Therefore, there are still many shortcomings in terms of exhaust gas treatment capacity, energy consumption, maintenance costs, and land area. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or to define the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0005] The present invention adopts the following technical solution:

[0006] A non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry is provided, comprising: an inner casing, a modular drawer assembly, and an exhaust device; the inner casing is provided with a pretreatment chamber, a deep treatment chamber, and a purification chamber sequentially from the input side to the output side; the pretreatment chamber is provided with a pretreatment unit and connected to the wastewater pond; the purification chamber is provided with an adsorption treatment unit and connected to the exhaust device; the modular drawer assembly comprises: a frame and drawers disposed on the frame; a flow equalization plate is provided below each drawer on the frame to divide the interior of the frame sequentially from bottom to top into a bottom chamber, a middle chamber, and a top chamber; a membrane separation unit is disposed in the bottom chamber; an oxidation desulfurization unit is disposed in the middle chamber; and a catalytic oxidation unit is disposed in the top chamber; the middle part of the flow equalization plate is recessed downward and the flow equalization plate has evenly distributed air passage holes.

[0007] Furthermore, the side of the inner box closest to the sewage tank is the input side, and an air intake pipe is provided on the input side panel of the inner box. The two ends of the air intake pipe are respectively connected to the sewage tank and the pretreatment chamber, and the pretreatment unit is located in the middle of the pretreatment chamber.

[0008] Furthermore, the frame is located in the middle of the deep processing chamber, and a first intercepting plate is provided on the top of the frame near the pre-processing chamber, and a second intercepting plate is provided on the bottom of the frame near the purification chamber.

[0009] Furthermore, an air inlet is provided at the top of the cavity wall between the deep processing chamber and the pre-processing chamber, and an air outlet is provided at the bottom of the cavity wall between the deep processing chamber and the purification chamber. The top of the first interceptor plate is inclined toward the side where the air inlet is located, and the bottom of the second interceptor plate is inclined toward the side where the air outlet is located.

[0010] Furthermore, the side of the inner casing furthest from the sewage tank is the output side; the exhaust device includes an upper louvered air outlet and a lower louvered air outlet, the upper louvered air outlet and the lower louvered air outlet being disposed on the output side panel of the inner casing.

[0011] Furthermore, the exhaust device also includes a cover plate and a branch output pipe. The cover plate is disposed on the upper louver air outlet and the lower louver air outlet, and the cover plate disposed on the upper louver air outlet is connected to the branch output pipe.

[0012] Furthermore, the aforementioned non-powered VOCs treatment equipment for wastewater ponds in the petroleum refining industry also includes: an outer casing, wherein the inner casing is disposed within the outer casing.

[0013] The beneficial effects of this utility model are as follows: by adopting a chamber partitioning and modular design and using a drawer-type installation method, the internal space of the device and the exhaust gas flow path are optimized. This not only effectively prevents the environmental pollution caused by the emission of exhaust gas from the oil separator, lifting tank and other waste gas into the atmosphere, but also has a small footprint, which is convenient for on-site layout, thereby maximizing space utilization and improving processing efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0015] Figure 1 This is a schematic diagram of the connection between a non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry and the wastewater pond.

[0016] Figure 2 This is a schematic diagram of the exhaust device of this utility model;

[0017] Figure 3 This is a schematic diagram of two non-powered VOCs treatment devices used in parallel for wastewater treatment in the petroleum refining industry.

[0018] Figure 4 This is a schematic diagram of the internal structure of a non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] like Figure 1-4 As shown in some illustrative embodiments, a non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry is provided, comprising: an outer casing 100, an inner casing 200, a modular drawer assembly, and an exhaust device. The outer casing 100 is made of corrosion-resistant materials such as stainless steel or high-density polyethylene to protect internal components from external environmental influences and to provide a basic structure for equipment installation. The inner casing 200 is made of the same or similar highly corrosion-resistant material as the outer casing and is internally divided into multiple chambers, each corresponding to a different treatment module. The modular drawer assembly is located within the inner casing 200, and the exhaust device transports the treated waste gas to an emission tower for high-altitude emission.

[0021] The inner chamber 200 is provided with a pretreatment chamber 210, a deep treatment chamber 220 and a purification chamber 230 in sequence from the input side to the output side.

[0022] A pretreatment unit 211 is installed within the pretreatment chamber 210. The main function of the pretreatment unit 211 is to perform preliminary treatment on the exhaust gas entering the equipment, removing large particulate matter, moisture, and other easily removable pollutants. The pretreatment unit 211 can employ filters and dehumidifiers. Filters typically use bag or plate designs to effectively intercept solid particles in the exhaust gas, while dehumidifiers reduce the humidity in the exhaust gas through condensation or absorption. Pretreatment by the pretreatment unit 211 reduces the burden on subsequent treatment units, improves overall treatment efficiency, and extends the equipment's service life.

[0023] The deep treatment chamber 220 is equipped with a membrane separation unit 221, an oxidative desulfurization unit 222, and a catalytic oxidation unit 223. The membrane separation unit 221 uses specific membrane materials to separate VOCs from the waste gas, achieving preliminary purification. This unit includes a membrane module; waste gas flows within the membrane module, VOCs are adsorbed or permeate through the membrane material, while other gases are discharged. Membrane separation technology can effectively separate and concentrate VOCs, laying the foundation for subsequent treatment. The oxidative desulfurization unit 222 removes sulfides, such as hydrogen sulfide, from the waste gas. It specifically includes an oxidant injection system and a reactor, converting sulfides into harmless sulfates or other forms through a chemical reaction. The oxidative desulfurization unit 222 effectively removes sulfides, protects the catalyst in the catalytic oxidation unit 223, and improves the overall treatment effect. The catalytic oxidation unit 223 uses a catalyst to oxidize VOCs into carbon dioxide and water, achieving harmless treatment. Specifically, it includes a catalyst bed and a heating system. The waste gas undergoes an oxidation reaction under the action of the catalyst to efficiently decompose VOCs. The conversion efficiency is high and no secondary pollution is generated.

[0024] An adsorption treatment unit 231 is installed inside the purification chamber 230. This unit serves as the final purification step, further removing residual VOCs and other pollutants from the exhaust gas. The adsorption treatment unit 231 is filled with activated carbon or other highly efficient adsorption materials. When the exhaust gas passes through these materials, pollutants are captured by the adsorbent. This adsorption treatment ensures that the exhaust gas meets environmental standards before emission.

[0025] The pretreatment chamber 210 is connected to the wastewater tank 300. The side of the inner casing 200 closest to the wastewater tank 300 is the input side. An air inlet pipe 250 is installed on the input side panel 240 of the inner casing, with both ends of the air inlet pipe 250 connected to the wastewater tank 300 and the pretreatment chamber 210, respectively. The pretreatment chamber 210 is connected to the wastewater tank 300 via the air inlet pipe 250, forming a closed waste gas collection system. The air inlet pipe 250 is used to introduce VOCs escaping from the wastewater tank 300 into the pretreatment chamber 210, which is the first step in the waste gas treatment process. Through the design of the pipe, the flow rate and velocity of the waste gas can be controlled, providing stable air intake conditions for subsequent treatment units.

[0026] The pretreatment unit 211 is located in the middle of the pretreatment chamber 210, with its upper and lower ends connected to the top and bottom walls of the pretreatment chamber 210, and gas flow space reserved on both sides of the pretreatment unit 211. Exhaust gas enters the pretreatment chamber 210 through the inlet pipe 250, and the pretreatment unit 211 begins operation, performing preliminary filtration and dehumidification of the exhaust gas to remove moisture and large particulate matter. This prevents these substances from affecting the efficiency and lifespan of subsequent deep treatment units, ensuring the continuity and high efficiency of the entire treatment process.

[0027] The modular drawer unit is located within the deep processing chamber 220 and specifically includes a frame 400 and three drawers 500 mounted on the frame 400. Each drawer 500 houses a membrane separation unit 221, an oxidation desulfurization unit 222, and a catalytic oxidation unit 223, allowing each processing unit to operate independently while facilitating quick replacement and maintenance. The frame 400 serves as the supporting structure for the modular drawer unit. The drawers 500 are mounted on the frame 400 via guide rails. A flow equalization plate 600 is provided below each drawer 500 on the frame 400, dividing the interior of the frame 400 from bottom to top into a bottom chamber 410, a middle chamber 420, and a top chamber 430.

[0028] A membrane separation unit 221 is installed on the drawer in the bottom chamber 410 for preliminary separation of larger molecules and particles in the exhaust gas; an oxidation desulfurization unit 222 is installed on the drawer in the middle chamber 420 for removing sulfides and other harmful substances from the exhaust gas; and a catalytic oxidation unit 223 is installed on the drawer in the top chamber 430 for promoting the oxidative decomposition of VOCs through a catalyst.

[0029] The flow equalization plate 600 has a concave center and evenly distributed air passages. These passages allow exhaust gas to flow smoothly from the lower chamber to the upper chamber. The concave center of the flow equalization plate 600 not only increases the flow area of ​​the exhaust gas and reduces airflow resistance, but also prevents the exhaust gas from accumulating in the center, resulting in better dispersion and ensuring sufficient contact and treatment. The flow equalization plate 600 not only provides physical separation but also optimizes the flow path and distribution of the exhaust gas through its special structure, thereby improving the efficiency of the entire treatment device.

[0030] The frame 400 is positioned in the middle of the deep treatment chamber 220, meaning that the upper and lower end faces and left and right sides of the frame 400 maintain a certain distance from the chamber wall, ensuring sufficient flow space for the exhaust gas around the frame. A first interceptor plate 440 is installed on the top of the frame 400 near the pretreatment chamber 210, and a second interceptor plate 450 is installed on the bottom of the frame 400 near the purification chamber 230. An air inlet 460 is opened at the top of the chamber wall between the deep treatment chamber 220 and the pretreatment chamber 210, and an air outlet 470 is opened at the bottom of the chamber wall between the deep treatment chamber 220 and the purification chamber 230.

[0031] The top of the first interceptor plate 440 is inclined towards the side where the inlet 460 is located, which helps guide the exhaust gas smoothly from the inlet 460 into the deep treatment chamber 220. The bottom of the second interceptor plate 450 is inclined towards the side where the outlet 470 is located, which helps guide the treated exhaust gas smoothly to the outlet 470 and enter the purification chamber 230 for final adsorption treatment. The arrangement of the frame 400 in the deep treatment chamber 220 and the design of its related interceptor plates and inlets are designed to optimize the flow path of the exhaust gas, improve treatment efficiency, and ensure that the exhaust gas can pass evenly through each treatment unit.

[0032] The purification chamber 230 is connected to an exhaust system, which ensures that the treated exhaust gas can be effectively discharged from the system while avoiding air resistance problems that may occur during the exhaust process. The exhaust system includes: an upper louvered air outlet 710, a lower louvered air outlet 720, a cover plate 730, and a branch output pipe 740.

[0033] The side of the inner casing 200 furthest from the sewage tank 300 is the output side. The upper louvered air outlet 710 and the lower louvered air outlet 720 are located on the output side panel 260 of the inner casing. The louvered design can effectively regulate the exhaust gas emission speed, prevent external debris from entering the exhaust system, and disperse the exhaust gas flow, reducing the accumulation of exhaust gas at a single exhaust outlet due to air resistance.

[0034] A cover plate 730 is installed on the upper louvered air outlet 710 and the lower louvered air outlet 720. The cover plate 730 is a movable or adjustable plate structure used to cover the upper louvered air outlet 710 and the lower louvered air outlet 720. The cover plate 730 installed on the upper louvered air outlet 710 is connected to the branch output pipe 740. If the number of equipment at the on-site exhaust gas treatment point needs to be increased, the treatment equipment can share the exhaust stack 800 and be equipped with a sampling port 900.

[0035] The inner casing 200 is housed within the outer casing 100. The outer casing 100 has external dimensions of 1300×900×1820mm. The waste gas treatment capacity of the non-powered treatment equipment is fixed at 0-30 cubic meters per hour. The membrane separation unit used in the non-powered treatment equipment can effectively isolate most water vapor, achieving a VOCs throughput of over 95%. Furthermore, the unit's own resistance is no greater than 300Pa, and the membrane flux can reach 80m³ / h. 3 / m 2 The membrane used has an area of ​​0.4 square meters and a processing capacity of up to 30 m³ / h. 3 / h.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry, characterized in that, include: The system comprises an inner casing, a modular drawer assembly, and an exhaust system. The inner casing, from the input side to the output side, sequentially includes a pretreatment chamber, a deep treatment chamber, and a purification chamber. The pretreatment chamber contains a pretreatment unit and is connected to a wastewater tank. The purification chamber contains an adsorption treatment unit and is connected to the exhaust system. The modular drawer assembly includes a frame and drawers mounted on the frame. Each drawer on the frame has a flow equalization plate below it, dividing the interior of the frame into a bottom chamber, a middle chamber, and a top chamber from bottom to top. The bottom chamber contains a membrane separation unit, the middle chamber contains an oxidation desulfurization unit, and the top chamber contains a catalytic oxidation unit. The flow equalization plate has a downwardly recessed center and evenly distributed air passages.

2. The non-powered VOCs treatment equipment for wastewater ponds in the petroleum refining industry according to claim 1, characterized in that, The inner box has an input side on the side closest to the sewage tank. An air intake pipe is provided on the input side panel of the inner box. The two ends of the air intake pipe are connected to the sewage tank and the pretreatment chamber, respectively. The pretreatment unit is located in the middle of the pretreatment chamber.

3. The non-powered VOCs treatment equipment for wastewater ponds in the petroleum refining industry according to claim 2, characterized in that, The frame is located in the middle of the deep processing chamber. A first intercepting plate is provided on the top of the frame near the pre-processing chamber, and a second intercepting plate is provided on the bottom of the frame near the purification chamber.

4. The non-powered VOCs treatment equipment for wastewater ponds in the petroleum refining industry according to claim 3, characterized in that, An air inlet is provided at the top of the cavity wall between the deep processing chamber and the pre-processing chamber, and an air outlet is provided at the bottom of the cavity wall between the deep processing chamber and the purification chamber. The top of the first interceptor plate is inclined toward the side where the air inlet is located, and the bottom of the second interceptor plate is inclined toward the side where the air outlet is located.

5. A non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry according to claim 4, characterized in that, The side of the inner casing away from the sewage tank is the output side; the exhaust device includes an upper louvered air outlet and a lower louvered air outlet, which are disposed on the output side panel of the inner casing.

6. A non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry according to claim 5, characterized in that, The exhaust device further includes a cover plate and a branch output pipe. The cover plate is disposed on the upper louver air outlet and the lower louver air outlet. The cover plate disposed on the upper louver air outlet is connected to the branch output pipe.

7. A non-powered VOCs treatment device for wastewater ponds in the petroleum refining industry according to claim 6, characterized in that, Also includes: An outer casing, wherein the inner casing is disposed within the outer casing.

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