Cleaning method and cleaning system for rotary RTO incinerator

Abstract

The invention provides a cleaning method and system for a rotary RTO incinerator, and the cleaning method for the rotary RTO incinerator comprises the following steps: S1, medium-pressure steam is subjected to heat exchange in a crude benzene rich oil heater to form high-temperature steam, and the high-temperature steam enters a flash tank; s2, the flash tank separates the high-temperature steam into low-pressure steam and high-temperature water; s3, the high-temperature water enters a mixing tank to be mixed with clear water, and hot water of 70-80 DEG C is generated; and S4, the hot water at the temperature of 70-80 DEG C is conveyed into a combustion chamber of the RTO incinerator, and a heat exchange chamber in the RTO incinerator is cleaned. According to the method, the RTO incinerator is cleaned, so that the resistance of the RTO incinerator is reduced from 5000 pa to about 1000 pa; and the cleaning operation time of the RTO incinerator is shortened from 72 hours in the original plan to 24 hours.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment equipment, and in particular to a cleaning method and a cleaning system for a rotary RTO incinerator. Background Art

[0002] In the field of coking VOCs exhaust gas treatment, rotary RTO incinerators play a key role. Their efficient treatment capabilities have made them a key waste gas management tool for many companies. However, when using rotary RTO incinerators to treat coking exhaust gas, the exhaust carries large amounts of dust, tar, and other highly viscous substances. Over long-term operation, these substances can cause clogging of the packing layer. Currently, the common treatment methods for this clogging are steam cleaning and water flushing. However, the RTO incinerator's packing has a multi-layered structure, making it difficult for steam to penetrate all the packing layers, resulting in unsatisfactory cleaning results. Water flushing, on the other hand, also suffers from poor cleaning results due to the low solubility of cold water for impurities in the packing. To achieve better cleaning results, hot water is required. The conventional practice is to heat cold water with steam before cleaning. While this method can achieve a certain cleaning effect, it also has some significant disadvantages, such as slow steam heating, large water temperature fluctuations, low hot water flow rate, and severe vibration of the chamber. Summary of the Invention

[0003] The present application is made in view of the above-mentioned problems, and its object is to provide a cleaning method and cleaning system for a rotary RTO incinerator.

[0004] Specifically, the first aspect of the present application provides a method for cleaning a rotary RTO incinerator, comprising the following steps:

[0005] S1: The medium-pressure steam is heat-exchanged in the crude benzene-rich oil heater to form high-temperature steam that enters the flash tank;

[0006] S2: Flash tank separates high-temperature steam into low-pressure steam and high-temperature water;

[0007] S3: The high-temperature water enters a mixing tank and is mixed with clean water to produce hot water at 70-80°C;

[0008] S4: transporting the 70-80° C. hot water to the combustion chamber of the RTO incinerator to clean the heat exchange chamber in the RTO incinerator.

[0009] Furthermore, the temperature of the high temperature water in step S2 is 95-100°C.

[0010] Furthermore, the temperature of the clean water in step S3 is 25-40°C.

[0011] Furthermore, the flow rate of the 70-80°C hot water in step S3 is 8-9 t / h.

[0012] Furthermore, the 70-80° C. hot water in step S4 is used to clean the heat exchange chambers of several zones in the RTO incinerator simultaneously through several cleaning pipes.

[0013] The second aspect of the present application provides a cleaning system for a rotary RTO incinerator, comprising a high-temperature water production module, a hot water production module and an RTO incinerator cleaning module.

[0014] The high-temperature water production module includes a crude benzene oil-rich heater and a flash tank. The crude benzene oil-rich heater is used to exchange heat with medium-pressure steam and send the generated high-temperature steam into the flash tank. The flash tank is used to separate the high-temperature steam into low-pressure steam and high-temperature water.

[0015] The hot water production module includes a mixing tank and a clean water supply device. The mixing tank is used to mix high-temperature water with clean water to produce 70-80°C hot water;

[0016] The RTO incinerator cleaning module includes a cleaning pipe, which is used to transport 70-80°C hot water into the RTO incinerator combustion chamber to clean the heat exchange chamber in the RTO incinerator.

[0017] Furthermore, a flow pump and a valve are provided on the cleaning pipeline.

[0018] Furthermore, a tee is provided at the inlet of the cleaning pipeline connected to the RTO incinerator, and the tee is used to connect the cleaning pipeline with the inside of the RTO incinerator.

[0019] Furthermore, the combustion chamber of the RTO incinerator is connected to a tee through a hose, which is used to clean the fillers of the heat exchange chambers of several partitions of the RTO furnace.

[0020] Furthermore, a drain port is provided at the bottom of the RTO incinerator.

[0021] The present invention has the following beneficial effects:

[0022] The present invention's method for cleaning a rotary RTO incinerator utilizes a crude benzene-rich oil heater and a flash tank to generate constant high-temperature water, which is mixed with clean water to form hot water with a stable temperature. Through a specific cleaning piping system, multiple heat exchange chamber areas in the RTO incinerator can be efficiently cleaned simultaneously. Compared to traditional cleaning methods, the present invention not only improves cleaning efficiency, shortening the RTO furnace cleaning operation time to 24 hours, but also significantly improves the cleaning effect. By precisely controlling the temperature and flow of the hot water, the present invention ensures the stability and reliability of the cleaning process, effectively avoiding adverse factors such as cabinet vibration, thereby extending the service life of the RTO incinerator and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 This is a schematic structural diagram of the cleaning system of the RTO incinerator of the present invention.

[0025] Explanation of the accompanying figures: 1. Crude benzene rich oil heater; 2. Flash tank; 3. Mixing tank; 4. Cleaning pipeline; 5. Combustion chamber; 6. Heat exchange chamber; 7. Drain port; 8. Inlet hole; 9. Flow pump.

[0026] The purpose, features and advantages of this drawing will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative work are within the scope of protection of this application.

[0028] Obviously, the following descriptions are merely some examples or embodiments of the present application. Those skilled in the art can apply the present application to other similar scenarios without inventive effort. Furthermore, it is also understood that, although the effort involved in such a development process may be complex and lengthy, for those skilled in the art related to the content disclosed in the present application, changes in design, manufacturing, or production based on the technical content disclosed in the present application are merely conventional technical means and should not be construed as an insufficiency of the content disclosed in the present application.

[0029] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0030] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0031] Example

[0032] An embodiment of the first aspect of the present application provides a method for cleaning a rotary RTO incinerator, comprising the following steps:

[0033] S1: The medium-pressure steam is heat-exchanged in the crude benzene-rich oil heater to form high-temperature steam that enters the flash tank;

[0034] S2: Flash tank separates high-temperature steam into low-pressure steam and high-temperature water;

[0035] S3: The high-temperature water enters a mixing tank and is mixed with clean water to produce hot water at 70-80°C;

[0036] S4: transporting the 70-80° C. hot water to the combustion chamber of the RTO incinerator to clean the heat exchange chamber in the RTO incinerator.

[0037] In the crude benzene section of the coking production workshop, the production process mostly relies on oil-rich heaters. After the oil-rich heaters perform their heat exchange function, the generated substances are separated and processed in flash tanks, and can stably produce about 5 tons of hot water per hour with a temperature of 100°C.

[0038] Based on the above background, the present invention proposes a method for using steam condensate from a crude benzene oil-rich heater as cleaning water for an RTO incinerator. This method avoids problems such as slow steam heating, large water temperature fluctuations, low hot water flow, and large box vibration. It can accurately and effectively dissolve impurities in the filler, thereby achieving the purpose of stable and efficient cleaning and ensuring the continued normal operation of the rotary RTO incinerator.

[0039] In addition, this method also has the following economic effects:

[0040] 1. Reduce downtime losses: RTO furnaces are key equipment for waste gas treatment in chemical product recovery areas. Rapid cleaning can significantly shorten downtime. If an RTO furnace is shut down for cleaning due to blockage, the chemical products tar, ammonia, and crude benzene cannot be shipped. Due to the tail gas system outage, other production sections will need to reduce production. Rapid cleaning can promptly restore the waste gas treatment system to operation, ensuring continuous operation of the production line and reducing losses caused by downtime, such as reduced product production and delayed by-product shipments.

[0041] 2. Reduced energy costs: Timely and rapid cleaning keeps the RTO furnace in good operating condition, improving heat exchange efficiency and reducing resistance. After cleaning, the heat transfer capacity of the thermal storage element increases and resistance decreases, effectively reducing the load on the VOC exhaust fan and gas consumption. This cleaning method shortens cleaning time by 2 / 3 compared to the original plan, reducing labor time and labor intensity.

[0042] 3. Extending Equipment Life: Rapid cleaning effectively removes impurities and dirt adhering to the equipment's interior, preventing these substances from corroding and wearing out equipment components. For example, the prolonged presence of highly viscous materials clogged in the packing layer can accelerate packing aging and damage. Prolonged cleaning can damage the insulation layer within the RTO incinerator, resulting in poor insulation and heat loss. Regular rapid cleaning can extend the service life of packing and other key components, reduce the frequency of equipment replacement and repair, and lower equipment upgrade and maintenance costs.

[0043] The present invention's method for cleaning a rotary RTO incinerator utilizes a crude benzene-rich oil heater and a flash tank to generate constant high-temperature water, which is mixed with clean water to form hot water with a stable temperature. Through a specific cleaning piping system, multiple heat exchange chamber areas in the RTO incinerator can be efficiently cleaned simultaneously. Compared to traditional cleaning methods, the present invention not only improves cleaning efficiency, shortening the RTO furnace cleaning operation time to 24 hours, but also significantly improves the cleaning effect. By precisely controlling the temperature and flow of the hot water, the present invention ensures the stability and reliability of the cleaning process, effectively avoiding adverse factors such as cabinet vibration, thereby extending the service life of the RTO incinerator and reducing maintenance costs.

[0044] In an embodiment of the present invention, in step S1, 600°C medium-pressure steam is heat-exchanged in a crude benzene oil-rich heater to form high-temperature steam, which then enters a flash tank. In step S2, the flash tank separates the high-temperature steam into 160°C low-pressure steam and 95-100°C high-temperature water, preferably at 100°C and a flow rate of 5 t / h. The 95-100°C high-temperature water enters a mixing tank via a pipeline, while the 160°C low-pressure steam enters a low-pressure steam network via a pipeline.

[0045] In an embodiment of the present invention, the temperature of the clean water in step S3 is 25-40°C. The temperature of the clean water is preferably 30°C. 5t / h of hot water at about 100°C is fed into a mixing tank and mixed with clean water at 25-40°C. According to the law of conservation of heat and the law of conservation of mass, the mixture produces hot water at 70-80°C, and the flow rate of the 70-80°C hot water is 8-9t / h. The present invention uses 8-9t / h, 70-80°C hot water to clean the RTO incinerator, and its cleaning effect is more significant than that of the traditional method. The high temperature and stable flow rate of hot water can more effectively dissolve and flush out impurities and dirt in the heat exchange chamber, thereby improving the efficiency and quality of cleaning. In addition, by precisely controlling the temperature and flow rate of hot water, the present invention also ensures the stability and reliability of the cleaning process, avoiding problems such as incomplete cleaning or equipment damage due to water temperature fluctuations or insufficient flow rate.

[0046] In an embodiment of the present invention, the 70-80°C hot water described in step S4 is used to simultaneously clean the heat exchange chambers of several zones in the RTO incinerator through several cleaning pipes. The hot water is delivered to the RTO incinerator combustion chamber via a flow pump pipe. Two cleaning pipes are used to simultaneously clean the heat exchange chambers of 12 zones in the RTO incinerator. The cleaned liquid flows through a drain port at the bottom of the RTO furnace into an underground tank and is finally pumped to the blast cooling residual ammonia tank for treatment.

[0047] The embodiment of the second aspect of the present application provides a cleaning system for a rotary RTO incinerator, comprising a high-temperature water production module, a hot water production module and an RTO incinerator cleaning module.

[0048] The high-temperature water production module includes a crude benzene oil-rich heater 1 and a flash tank 2. The crude benzene oil-rich heater 1 is used to exchange heat with medium-pressure steam and send the generated high-temperature steam into the flash tank 2. The flash tank 2 is used to separate the high-temperature steam into low-pressure steam and high-temperature water; the hot water production module includes a mixing tank 3 and a clean water supply device. The mixing tank 3 is used to mix high-temperature water with clean water to produce 70-80°C hot water; the RTO incinerator cleaning module includes a cleaning pipe 4, which is used to transport 70-80°C hot water to the RTO incinerator combustion chamber 5 to clean the heat exchange chamber 6 in the RTO incinerator.

[0049] Specifically, the crude benzene oil-rich heater 1 in the high-temperature water production module is connected to the flash tank 2 via a pipeline. The crude benzene oil-rich heater 1 is used to exchange heat with 400°C medium-pressure steam. The resulting high-temperature steam is piped to the flash tank 2, where it is separated into low-pressure steam at approximately 160°C and high-temperature water at approximately 100°C. The flash tank 2 then pipes the low-pressure steam at approximately 160°C to the low-pressure steam network and the high-temperature water at approximately 100°C to the mixing tank 3. This invention directly introduces the 100°C hot water separated by the flash tank 2 into the RTO furnace cleaning system, replacing the existing steam-heated cold water cleaning method. Before the 100°C hot water is introduced into the RTO incinerator cleaning module, a mixing tank 3 is installed to adjust the ratio of hot water to cold water, ensuring a moderate and stable cleaning fluid temperature. By precisely controlling the mixing ratio, the ideal cleaning fluid temperature can be achieved, effectively dissolving impurities in the filler while preventing damage to the equipment caused by excessive temperatures.

[0050] The mixing tank 3 in the hot water production module has a volume of about 3m 3 Made of 304 stainless steel, its design ensures uniform mixing of hot and clean water to achieve the desired temperature of 70-80°C. The special internal structure of Mixing Tank 3 effectively prevents temperature fluctuations during the mixing process, ensuring the stability and consistency of the hot water. Furthermore, Mixing Tank 3 is equipped with a temperature sensor to monitor the hot water temperature in real time, ensuring it remains within the set range.

[0051] The cleaning pipe 4 of the RTO incinerator cleaning module ensures that hot water is evenly and efficiently delivered to each heat exchange chamber 6 of the RTO incinerator. The cleaning pipe 4 is made of corrosion-resistant and high-temperature resistant materials to meet the requirements of high-temperature hot water transmission. The smooth interior of the pipe reduces water flow resistance and improves cleaning efficiency.

[0052] In the embodiment of the present invention, a flow pump 9 and a valve are provided on the cleaning pipeline 4. The cleaning pipeline 4 adopts a DN25 steel pipe, and the flow pump 9 is 20m 3 / h flow pump, the flow pump is used to control the flow of hot water to ensure a stable supply of hot water during the cleaning process, while the valve is used to adjust and close the cleaning pipe 4 so that the cleaning operation can be interrupted or adjusted when necessary. Furthermore, in order to enhance the flexibility and adaptability of the cleaning system, the design of the cleaning pipe 4 takes into account a variety of connection methods and layouts to accommodate RTO incinerators of different models and specifications. For example, the cleaning pipe 4 can be connected to multiple inlet holes 8 of the RTO incinerator through connectors such as tees to ensure that hot water can be evenly distributed to various areas of the incinerator. In addition, the cleaning pipe 4 can also be extended or shortened according to actual needs to meet the needs of different cleaning scenarios. The design of the cleaning pipe 4 ensures that the hot water can be evenly distributed and fully contact the filler of the heat exchange chamber 6, thereby effectively dissolving and removing impurities and dirt attached to the filler. In addition, the flow pump and valve set on the cleaning pipe 4 can accurately control the flow and pressure of the hot water to ensure the stability and reliability of the cleaning process.

[0053] In an embodiment of the present invention, a tee is provided at the entry hole 8 of the RTO incinerator where the cleaning pipe 4 is connected. The tee is used to connect the cleaning pipe 4 to the interior of the RTO incinerator. The design of the tee enables the cleaning pipe 4 to be flexibly connected to different areas of the RTO incinerator, thereby achieving comprehensive cleaning of the entire incinerator and improving cleaning efficiency.

[0054] In an embodiment of the present invention, the combustion chamber 5 of the RTO incinerator is connected to a tee via a hose, which is used to clean the fillers of the heat exchange chambers 6 of several partitions of the RTO furnace. The combustion chamber 5 of the RTO incinerator is connected to the tee via a hose, which can achieve the purpose of simultaneous operation. The design of the hose not only ensures the smooth flow of hot water, but also improves the flexibility of the cleaning operation. The hose material is made of special rubber that is resistant to high temperatures and corrosion-resistant to adapt to the transmission environment of high-temperature hot water, while ensuring that hot water will not leak due to aging or breakage of the hose during the cleaning process. Through the connection between the hose and the tee, hot water can be evenly distributed to each partition of the RTO incinerator, ensuring that each heat exchange chamber 6 can be fully cleaned. In addition, the design of the hose is also convenient for installation and disassembly, which facilitates the cleaning operation.

[0055] In this embodiment of the present invention, a drain port 7 is provided at the bottom of the RTO incinerator. This design allows wastewater and impurities generated during the cleaning process to be promptly discharged from the incinerator, preventing any impact on the cleaning effect and normal operation of the incinerator. Furthermore, the color of the cleaning water discharged from the bottom drain port 7 can be used to determine whether the packing in the heat exchange chamber 6 has been thoroughly cleaned.

[0056] The RTO incinerator cleaned using the method described above saw its resistance drop from 5000 Pa before cleaning to approximately 1000 Pa afterward. This reduced the RTO furnace cleaning time from the original 72 hours to 24 hours. The original 72 hours were due to the long time required to heat the cold water with steam, and the large temperature fluctuations during the heating process affected cleaning efficiency. Using steam condensate from the crude benzene-rich oil heater as the cleaning fluid not only speeds up heating but also maintains a stable water temperature, significantly shortening the cleaning time.

[0057] In summary, the present invention provides a cleaning method and system for a rotary RTO incinerator with significant benefits. By utilizing a crude benzene-rich oil heater 1 and a flash tank 2 to generate constant high-temperature water, which is then mixed with clean water to form hot water with a stable temperature, and then efficiently cleaning the heat exchange chamber 6 in the RTO incinerator through a specific cleaning pipeline 4 system, the present invention not only improves cleaning efficiency and effectiveness, but also ensures the stability and reliability of the cleaning process. Furthermore, the present invention's cleaning method offers advantages such as high economic efficiency and simple and convenient operation, providing a new solution for cleaning rotary RTO incinerators.

[0058] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are merely examples, and any embodiments having substantially the same structure and effect as the technical concept within the scope of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the present application, any other embodiments that can be conceived by those skilled in the art and that combine some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A method for cleaning a rotary RTO incinerator, characterized in that: The following steps are involved: S1: The medium-pressure steam is heat-exchanged in the crude benzene-rich oil heater to form high-temperature steam that enters the flash tank; S2: Flash tank separates high-temperature steam into low-pressure steam and high-temperature water; S3: The high-temperature water enters a mixing tank and is mixed with clean water to produce hot water at 70-80°C; S4: transporting the 70-80° C. hot water to the combustion chamber of the RTO incinerator to clean the heat exchange chamber in the RTO incinerator.

2. The cleaning method of the rotary RTO incinerator according to claim 1, characterized in that: The temperature of the high temperature water in step S2 is 95-100°C.

3. The cleaning method of the rotary RTO incinerator according to claim 1, characterized in that: The temperature of the clean water in step S3 is 25-40°C.

4. The cleaning method of the rotary RTO incinerator according to claim 1, characterized in that: The flow rate of the 70-80°C hot water in step S3 is 8-9 t / h.

5. The cleaning method of the rotary RTO incinerator according to claim 1, characterized in that: In step S4, the 70-80° C. hot water passes through a plurality of cleaning pipes to clean the heat exchange chambers of a plurality of zones in the RTO incinerator simultaneously.

6. A cleaning system for a rotary RTO incinerator, characterized in that: Including high temperature water production module, hot water production module and RTO incinerator cleaning module, The high-temperature water production module comprises a crude benzene oil-rich heater (1) and a flash tank (2), wherein the crude benzene oil-rich heater (1) is used to perform heat exchange on the medium-pressure steam and send the generated high-temperature steam into the flash tank (2), and the flash tank (2) is used to separate the high-temperature steam into low-pressure steam and high-temperature water; The hot water production module comprises a mixing tank (3) and a clean water supply device, wherein the mixing tank (3) is used to mix high-temperature water with clean water to produce hot water at 70-80°C; The RTO incinerator cleaning module comprises a cleaning pipe (4), and the cleaning pipe (4) is used to transport 70-80°C hot water into the RTO incinerator combustion chamber (5) to clean the heat exchange chamber (6) in the RTO incinerator.

7. The cleaning system of the rotary RTO incinerator according to claim 6, characterized in that: The cleaning pipeline (4) is provided with a flow pump (9) and a valve.

8. The cleaning system of the rotary RTO incinerator according to claim 7, characterized in that: A tee is provided at the inlet (8) of the RTO incinerator where the cleaning pipe (4) is connected to the inlet, and the tee is used to connect the cleaning pipe (4) with the inside of the RTO incinerator.

9. The cleaning system of the rotary RTO incinerator according to claim 8, characterized in that: The RTO incinerator combustion chamber (5) is connected to a tee via a hose and is used to clean fillers in heat exchange chambers (6) of several partitions of the RTO furnace.

10. The cleaning system of the rotary RTO incinerator according to claim 6, characterized in that: A liquid drain port (7) is provided at the bottom of the RTO incinerator.

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