A pre-triad treatment system for rto combustion

Abstract

The utility model discloses a kind of front three-tower processing systems of RTO combustion, including regenerative thermal oxidation furnace, it is characterized in that, the regenerative thermal oxidation furnace connects gas combustion pretreatment module, the gas combustion pretreatment module is used to handle gas, and the processing includes pickling treatment, water washing treatment and mist removal treatment.The utility model relates to ROT equipment gas treatment equipment technical field before burning, specifically, it is related to a kind of front three-tower processing systems of RTO combustion, by the series connection processing of pickling spray tower, water washing tower, mist removal tower, stepwise removal of waste gas impurities, waste gas pretreatment is thorough, meets the requirement of inlet gas.

Description

Technical Field

[0001] This utility model relates to the technical field of pre-combustion gas treatment equipment for ROT equipment, specifically, to a three-tower pre-combustion treatment system for RTO combustion. Background Technology

[0002] Regenerative thermal oxidizers (RTOs) are core equipment for industrial organic waste gas treatment. Their working principle is to decompose organic pollutants in waste gas through high-temperature oxidation at 800-1000℃, while simultaneously recovering the heat generated by combustion using a heat storage medium, thus achieving the dual goals of energy saving and environmental protection. They are widely used in industries such as chemical, coating, and printing.

[0003] However, existing RTO processing systems have significant technical shortcomings in practical applications, mainly in the following aspects:

[0004] Incomplete exhaust gas pretreatment leads to frequent RTO equipment failures: Existing systems often only perform simple demisting of the exhaust gas, failing to specifically treat acidic substances (such as HCl and SO2), alkaline impurities (such as NH3 and amines), and dust contained in the exhaust gas. These impurities, when directly introduced into the RTO, adhere to the surface of the heat storage medium (such as ceramic heat storage bricks), forming deposits that clog the pores and significantly reduce heat exchange efficiency (by up to 30% or more). Simultaneously, acidic substances corrode the RTO furnace walls and burners, causing burner ignition failures, furnace wall leaks, and other problems. In severe cases, shutdown and replacement of the heat storage medium or burner are necessary, increasing maintenance costs by 50%-80%.

[0005] In view of the shortcomings of the existing technologies, there is an urgent need for an RTO combustion treatment system that can achieve deep pretreatment of exhaust gas. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a three-tower pretreatment system for RTO combustion, which removes impurities from the exhaust gas in a stepwise manner through the series treatment of acid washing spray tower, water washing tower and demister tower, and the exhaust gas pretreatment is thorough to meet the intake requirements.

[0007] A three-tower pretreatment system for RTO combustion includes a regenerative thermal oxidizer, characterized in that the regenerative thermal oxidizer is connected to a gas combustion pretreatment module, which is used to treat the gas, including acid washing, water washing and demisting.

[0008] Furthermore, the gas combustion pretreatment module includes a demisting tower, a water washing tower, and an acid washing spray tower. The acid washing spray tower is used for acid washing treatment of the gas before combustion, the water washing tower is used for water washing treatment of the gas before combustion, and the demisting tower is used for demisting treatment of the gas before combustion.

[0009] Furthermore, the pickling spray tower is provided with a gas inlet, the upper gas outlet of the pickling spray tower is fixedly connected to the gas inlet pipe of the water washing tower through a first discharge pipe, the upper gas outlet of the water washing tower is fixedly connected to the gas inlet pipe of the demister tower through a second discharge pipe, the upper gas outlet of the demister tower is fixedly connected to the lower gas inlet port on one side of the regenerative thermal oxidizer through a conveying pipeline, and the other side of the regenerative thermal oxidizer is provided with a gas outlet port.

[0010] Furthermore, a set of inspection ports is provided on the lower middle part of one side of the regenerative thermal oxidizer, and each inspection port is equipped with an inspection door. The inspection door and the regenerative thermal oxidizer are detachably and fixedly connected.

[0011] Furthermore, a maintenance platform is fixedly installed on one side of the regenerative thermal oxidizer, corresponding to the lower position of the maintenance port. One end of the maintenance platform is fixedly connected to a ladder, which is inclined.

[0012] Furthermore, maintenance platforms are fixedly arranged around the other side and the remaining two ends of the regenerative thermal oxidizer. The maintenance platforms are arranged corresponding to the upper middle part of the regenerative thermal oxidizer. The maintenance platforms are fixedly connected to ladders, which are inclined.

[0013] Furthermore, a purging mechanism is also provided on the lower side of the regenerative thermal oxidizer. The purging mechanism includes a purging pipe, which is fixedly connected to the regenerative thermal oxidizer. One end of the purging pipe is fixedly connected to the air outlet of a ventilation fan.

[0014] Compared with the prior art, the advantages and positive effects of this utility model are:

[0015] Thorough pretreatment of exhaust gas ensures stable operation of RTO, reduces secondary pollution, and multi-dimensional impurity removal improves purification efficiency. Through the series treatment of acid washing spray tower, water washing tower and demister tower, impurities in exhaust gas are removed in a step-by-step manner to meet the intake requirements.

[0016] At the same time, it avoids damage to the core components of the RTO, reduces the probability of failure, and ensures that the pre-treated exhaust gas is free of corrosive impurities and water mist, preventing blockage / corrosion of the heat storage body and burner failure, thereby extending the continuous operation cycle of the RTO and reducing the number of downtime maintenance.

[0017] To reduce secondary pollution and meet environmental standards, acidic substances and alkaline impurities are neutralized and removed during the pretreatment stage, avoiding the generation of secondary pollutants at the high temperature of RTO. The exhaust gas emission concentration after treatment meets the "Standard for the Control of Unorganized Emissions of Volatile Organic Compounds" (GB 37822-2019). Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. Obviously, the drawings described below are merely some embodiments of this utility model, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0019] Figure 1 The three-dimensional representation of this utility model Figure One ;

[0020] Figure 2 The three-dimensional representation of this utility model Figure Two ;

[0021] Figure 3 This is a side view of the present invention.

[0022] In the diagram: 1. Regenerative thermal oxidizer; 2. Inspection port; 3. Inspection door; 4. Inspection platform one; 5. Fan; 6. Purge pipe; 7. Ladder one; 8. Conveying pipeline; 9. Demisting tower; 10. Second discharge pipe; 11. Water washing tower; 12. First discharge pipe; 13. Pickling spray tower; 14. Observation window; 15. Inspection platform two; 16. Support frame; 17. Ladder two; 18. Gas inlet. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] A pre-combustion three-tower treatment system for RTO combustion includes a regenerative thermal oxidizer 1 (RTO equipment), characterized in that the regenerative thermal oxidizer 1 is connected to a gas combustion pretreatment module, which is used to treat the gas, including acid washing, water washing and demisting.

[0025] The gas combustion pretreatment module includes a demisting tower 9, a water washing tower 11, and an acid washing spray tower 13. The acid washing spray tower 13 is used for acid washing treatment of the gas before combustion, the water washing tower 11 is used for water washing treatment of the gas before combustion, and the demisting tower 9 is used for demisting treatment of the gas before combustion.

[0026] In this embodiment, a pretreatment step is added before RTO combustion;

[0027] Pickling treatment: This method uses acidic solutions (such as dilute sulfuric acid and hydrochloric acid) to react with alkaline impurities (such as NH3 and amines) or specific metal oxides in waste gas to remove these interfering components.

[0028] Water washing treatment: neutralizes residual acid mist after pickling, dissolves water-soluble impurities (such as some salts), and prevents acidic substances from being introduced into the RTO corrosion equipment;

[0029] Demisting treatment: Removes water mist carried in the exhaust gas after water washing, preventing water mist from contacting the high-temperature heat storage element inside the RTO, which could cause the heat storage element to crack or reduce thermal efficiency.

[0030] The pickling spray tower 13 adopts a spray contact design (acidic liquid is sprayed from top to bottom, and exhaust gas flows from bottom to top) to maximize the gas-liquid contact area and improve the pickling and impurity removal efficiency.

[0031] The water washing tower 11 adopts a spray structure, which neutralizes residual acid mist and dissolves impurities through neutral / weakly alkaline water, and complements the function of the acid washing tower.

[0032] The demisting tower 9 has a built-in demister (existing technologies, such as baffles and wire mesh demisters, will not be shown or described in detail), which uses the principles of inertial collision and centrifugal separation to capture water mist and avoid the problem of water entering the air;

[0033] By combining acid washing, water washing, and demisting, qualified air intake conditions are provided for the RTO equipment. Compared with the existing demisting treatment, where the exhaust gas directly enters the RTO equipment for combustion, the acidic substances (such as HCl and SO2), dust, and alkaline substances produced after acid washing in the exhaust gas are effectively reduced, avoiding heat storage blockage / corrosion, burner failure, and the generation of secondary pollutants.

[0034] The pickling spray tower 13 is provided with a gas inlet 18. The upper gas outlet of the pickling spray tower 13 is fixedly connected to the gas inlet pipe of the water washing tower 11 through the first discharge pipe 12. The upper gas outlet of the water washing tower 11 is fixedly connected to the gas inlet pipe of the demister tower 9 through the second discharge pipe 10. The upper gas outlet of the demister tower 9 is fixedly connected to the lower gas inlet port on one side of the regenerative thermal oxidizer 1 through the conveying pipeline 8. The other side of the regenerative thermal oxidizer 1 is provided with a gas outlet port.

[0035] In this embodiment, the pickling spray tower 13 is equipped with a gas inlet 18, which serves as the starting point for the waste gas to enter the pretreatment module. This ensures that the waste gas first enters the pickling stage, then enters the water washing tower 11, and finally enters the demister tower 9. After being discharged from the demister tower 9, it enters the RTO equipment, which conforms to the step-by-step purification logic. The purity of the waste gas is improved after each step of treatment, ultimately meeting the RTO intake requirements.

[0036] A set of inspection ports 2 is also provided on the lower middle part of one side of the regenerative thermal oxidizer 1. Each inspection port 2 is matched with an inspection door 3. The inspection door 3 and the regenerative thermal oxidizer 1 are detachably and fixedly connected.

[0037] In this embodiment, during long-term operation of the RTO, the internal heat storage medium may become clogged due to impurity deposits, the burner may experience ignition failures, and the furnace wall may corrode. Regular inspection / maintenance is required, hence the need for a maintenance port 2 on the RTO side wall. Simultaneously, the detachable maintenance door 3 can be opened and closed, ensuring equipment sealing and addressing the issue of the RTO being a closed system where internal components cannot be inspected / maintained. This facilitates regular cleaning of the heat storage medium and replacement of burner components. The maintenance door 3 is detachably and fixedly connected to the RTO (e.g., bolted connection + sealing gasket), which not only facilitates disassembly and maintenance but also prevents exhaust gas leakage from the maintenance port 2 during normal operation (reducing environmental pollution and safety risks). Regular maintenance allows for timely detection of internal faults (such as heat storage medium cracking or burner carbon buildup), preventing the faults from escalating and reducing the risk of equipment failure.

[0038] A maintenance platform 4 is fixedly installed on one side of the regenerative thermal oxidizer 1, corresponding to the lower position of the maintenance port 2. One end of the maintenance platform 4 is fixedly connected to a ladder 7, which is inclined.

[0039] Maintenance platform 2 15 is fixedly arranged around the other side and the other two ends of the regenerative thermal oxidizer 1. The maintenance platform 2 15 is arranged in the upper middle part of the regenerative thermal oxidizer 1. The maintenance platform 2 15 is fixedly connected to ladder 2 17, and the ladder 2 17 is inclined.

[0040] Ladder 1 (7), Ladder 2 (17), Maintenance Platform 1 (4), and Maintenance Platform 2 (15) meet the operating space and passage safety requirements of maintenance personnel.

[0041] A purging mechanism is also provided on the lower side of one side of the regenerative thermal oxidizer 1. The purging mechanism includes a purging pipe 6, which is fixedly connected to the regenerative thermal oxidizer 1. One end of the purging pipe 6 is fixedly connected to the air outlet of the ventilator 5.

[0042] In this embodiment, during RTO operation, trace amounts of dust may still remain after exhaust gas pretreatment, or a small amount of carbon deposits may be generated on the surface of the heat storage medium due to high-temperature oxidation. Long-term accumulation will block the pores of the heat storage medium, leading to a decrease in heat exchange efficiency and even causing local overheating. Therefore, a purging mechanism is set at the bottom of the RTO. High-pressure airflow is provided by the fan 5 and directly introduced into the RTO through the purging pipe 6. The airflow impact force is used to clean the impurities / carbon deposits on the surface and internal pores of the heat storage medium, restore the performance of the heat storage medium, and clean the impurities of the heat storage medium regularly. This will prevent pore blockage, ensure the heat absorption / release efficiency of the heat storage medium, avoid problems such as local overheating and uneven combustion caused by impurity accumulation, reduce the probability of RTO downtime for maintenance, reduce the wear and corrosion of the heat storage medium (such as ceramic heat storage bricks) by impurities, eliminate the need for frequent replacement of the heat storage medium, and reduce operation and maintenance costs.

[0043] The fan 5, ladder 1 7, ladder 2 17, pickling spray tower 13, demisting tower 9, water washing tower 11, and regenerative thermal oxidizer 1 are all fixedly installed on the ground.

[0044] The method of using this utility model is as follows:

[0045] Inject an acidic treatment solution (such as 5%-10% dilute sulfuric acid or hydrochloric acid by mass concentration) into the pickling spray tower 13;

[0046] Inject neutral / weakly alkaline water (such as softened water with a pH of 7-8) into the water washing tower 11;

[0047] First, start the spray pump of the acid pickling spray tower 13 to form a spray layer of acidic solution from top to bottom; then start the spray pump of the water washing tower 11 to form a water washing spray layer.

[0048] Start the exhaust gas conveying fan 5 to introduce industrial exhaust gas from the gas inlet 18 of the pickling spray tower 13. The exhaust gas comes into contact with the pickling spray layer from bottom to top to complete the removal of alkaline impurities and metal oxides.

[0049] The waste gas after acid washing enters the water washing tower 11 through the first discharge pipe 12, and comes into contact with the water washing spray layer from bottom to top, neutralizing the residual acid mist and dissolving water-soluble impurities.

[0050] After being washed with water, the exhaust gas enters the demister tower 9 through the second discharge pipe 10. After the demister captures the water mist, it becomes clean exhaust gas.

[0051] Clean exhaust gas enters the RTO from the lower end of the RTO through the conveying pipeline 8, and exchanges heat with the heat storage medium (which is preheated to above 800°C by the burner). Organic pollutants are completely oxidized and decomposed into CO2 and H2O.

[0052] The high-temperature purified gas after combustion is discharged through the outlet port on the other side of the RTO. During the discharge process, it exchanges heat with the heat storage body on the other side, transferring heat to the heat storage body (achieving heat recovery), and finally the exhaust gas temperature drops to meet the emission standards.

[0053] During RTO maintenance, loosen the fixing bolts of the maintenance door 3 and open the maintenance door 3;

[0054] Maintenance personnel climbed onto maintenance platform 4 via ladder 7 to inspect the regenerator and burner in the lower part of the RTO: cleaning visible dust from the surface of the regenerator, checking for carbon buildup on the burner ignition electrodes (if carbon buildup is found, it is cleaned with sandpaper), and checking for corrosion marks on the furnace wall.

[0055] If the upper part of the RTO (such as temperature sensor, exhaust valve) needs to be inspected, the maintenance personnel can climb the ramp 217 to the surrounding maintenance platform 215 to inspect and maintain the components (such as replacing faulty sensors, tightening pipe interface bolts).

[0056] After the maintenance is completed, close the maintenance door 3 and tighten it with bolts.

[0057] Heat storage body purging and cleaning: In the shutdown state, start the blower 5 of the purging mechanism, and the high-pressure airflow (0.3-0.5MPa) is introduced into the RTO through the purging pipe 6 to purge the heat storage body (each purging time is 15-30 minutes).

[0058] The above-disclosed embodiments are merely specific examples of this utility model. However, this utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.

Claims

1. A three-tower pre-treatment system for RTO combustion, characterized in that: The regenerative thermal oxidizer (1) is characterized in that the regenerative thermal oxidizer (1) is connected to a gas combustion pretreatment module, which is used to treat the gas, including acid washing, water washing and demisting. The gas combustion pretreatment module includes a demisting tower (9), a water washing tower (11), and an acid washing spray tower (13). The acid washing spray tower (13) is used for acid washing treatment of the gas before combustion, the water washing tower (11) is used for water washing treatment of the gas before combustion, and the demisting tower (9) is used for demisting treatment of the gas before combustion.

2. The three-tower pre-treatment system for RTO combustion according to claim 1, characterized in that: The pickling spray tower (13) is provided with a gas inlet (18). The upper gas outlet of the pickling spray tower (13) is fixedly connected to the air inlet pipe of the water washing tower (11) through the first discharge pipe (12). The upper gas outlet of the water washing tower (11) is fixedly connected to the air inlet pipe of the demisting tower (9) through the second discharge pipe (10). The upper gas outlet of the demisting tower (9) is fixedly connected to the air inlet port at the lower end of one side of the regenerative thermal oxidizer (1) through the conveying pipeline (8). The other side of the regenerative thermal oxidizer (1) is provided with an air outlet.

3. The three-tower pre-treatment system for RTO combustion according to claim 2, characterized in that: A set of inspection ports (2) is provided on the lower middle part of one side of the regenerative thermal oxidizer (1). Each inspection port (2) is matched with an inspection door (3). The inspection door (3) and the regenerative thermal oxidizer (1) are detachably and fixedly connected.

4. The three-tower pre-treatment system for RTO combustion according to claim 3, characterized in that: A maintenance platform (4) is fixedly installed on one side of the regenerative thermal oxidizer (1) at the lower position of the maintenance port (2). One end of the maintenance platform (4) is fixedly connected to a ladder (7), which is inclined.

5. The three-tower pre-treatment system for RTO combustion according to claim 4, characterized in that: Maintenance platform 2 (15) is fixedly arranged around the other side and the other two ends of the regenerative thermal oxidizer (1). Maintenance platform 2 (15) is arranged in the upper middle part of the regenerative thermal oxidizer (1). Maintenance platform 2 (15) is fixedly connected to ladder 2 (17). Ladder 2 (17) is inclined.

6. The three-tower pretreatment system for RTO combustion according to claim 1, characterized in that: A purging mechanism is also provided on the lower side of the regenerative thermal oxidizer (1). The purging mechanism includes a purging pipe (6), which is fixedly connected to the regenerative thermal oxidizer (1). One end of the purging pipe (6) is fixedly connected to the air outlet of the ventilator (5).

Images