Liquid-containing industrial carbon monoxide waste gas treatment device

Abstract

The utility model relates to the field of tail gas treatment, and discloses a liquid-containing industrial carbon monoxide waste gas treatment device which comprises a heat exchanger, a liquid separation tank, a wire mesh demister and an RTO combustion furnace which are sequentially connected in series through pipelines, and a diluent introduction pipeline is connected between the wire mesh demister and the RTO combustion furnace. Liquid-containing industrial carbon monoxide waste gas is cooled through the heat exchanger and then passes through the liquid separation tank and the wire mesh demister to obtain high-concentration carbon monoxide waste gas, a diluent is introduced through the diluent introduction pipeline to dilute the high-concentration carbon monoxide waste gas, and then the high-concentration carbon monoxide waste gas enters the RTO combustion furnace to be subjected to combustion treatment. The liquid-containing industrial carbon monoxide waste gas treatment device provided by the utility model can effectively solve the potential safety hazard in the industrial production process and ensure the safe operation of the industrial production.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment and discloses a device for treating liquid industrial carbon monoxide waste gas. Background Technology

[0002] Carbon monoxide (CO) is a colorless, odorless, and tasteless toxic gas, one of the main waste gases produced during incomplete combustion. Its main sources include vehicle exhaust, industrial production, and industrial and domestic combustion of coal and natural gas. CO is a toxic gaseous pollutant that poses a serious threat to human health and the environment. Therefore, effective treatment of industrial CO waste gas is an important measure to protect the environment, promote sustainable development, and ensure safe production. CO has a wide explosion limit range, with its explosive limits when mixed with air ranging from 12.5% ​​to 74.2%. Furthermore, CO has a molecular weight similar to air, and if not properly controlled, it can easily cause safety accidents. CO accumulation becomes even more severe under fire or poor ventilation conditions. Especially in flammable and explosive installations such as petrochemical plants, when atmospheric pressure is low, CO gas cannot diffuse and be emitted in time, accumulating around the installation and posing a significant safety hazard.

[0003] my country's environmental health authorities stipulate that the daily average concentration of CO gas in the air must not exceed 0.8 ppm, and the maximum permissible concentration for a single measurement is 2.4 ppm. The Hebei Provincial Local Standard "Carbon Monoxide Emission Standard for Stationary Sources" (DB487-2002) stipulates that the maximum permissible emission concentration of carbon monoxide from newly added pollution sources is 2000 mg / Nm³. 3 Therefore, CO exhaust gas needs to be treated before it can be released into the atmosphere to meet emission standards.

[0004] Currently, there are many types of industrial CO waste gas treatment technologies. Based on different treatment principles and methods, they can be divided into several commonly used technologies, such as catalytic oxidation, adsorption, biological treatment, and high-temperature combustion. Among them, high-temperature combustion involves burning CO waste gas at high temperatures to generate carbon dioxide gas, which is then released into the air. Utility Model Content

[0005] The purpose of this invention is to overcome the problems of complex processes and unsatisfactory implementation effects in existing industrial carbon monoxide waste gas treatment technologies, and to provide a liquid-containing industrial carbon monoxide waste gas treatment device. The liquid-containing industrial carbon monoxide waste gas treatment device provided by this invention can effectively solve the safety hazards existing in industrial production processes, has good implementation effects, ensures the safe operation of industrial production, and effectively solves the problem of liquid-containing industrial carbon monoxide waste gas treatment.

[0006] To achieve the above objectives, this utility model provides a device for treating liquid-containing industrial carbon monoxide waste gas. The device includes a heat exchanger, a liquid separator, a wire mesh demister, and an RTO (Regenerative Thermal Oxide) combustion furnace connected in series via pipelines. A diluent introduction pipeline connects the wire mesh demister and the RTO combustion furnace. The liquid-containing industrial carbon monoxide waste gas is first cooled by the heat exchanger, and then passes through the liquid separator and the wire mesh demister to obtain high-concentration carbon monoxide waste gas. Diluent is introduced through the diluent introduction pipeline to dilute the high-concentration carbon monoxide waste gas, and then it enters the RTO combustion furnace for combustion treatment.

[0007] Optionally, the heat exchanger is a graphite block perforated heat exchanger.

[0008] Optionally, along the direction of the exhaust gas flow, an oxygen content analyzer, a one-way valve, and a flame arrester are sequentially installed on the pipeline between the wire mesh demister and the diluent inlet pipeline.

[0009] Optionally, the liquid-containing industrial carbon monoxide waste gas treatment device is equipped with a carbon monoxide alarm.

[0010] Optionally, a blower is installed on the diluent inlet line.

[0011] Optionally, the blower is a variable frequency blower.

[0012] Optionally, an air inlet valve is installed at the feed end of the RTO combustion furnace, and the air inlet valve of the RTO combustion furnace is interlocked with an oxygen content analyzer.

[0013] Optionally, along the material flow direction, the discharge end of the RTO combustion furnace is connected in series with the buffer tank and the chimney.

[0014] Optionally, the inlet pipe of the RTO combustion furnace is equipped with a flame arrester and a check valve, and the outlet pipe adopts an anti-static design.

[0015] Optionally, the RTO combustion furnace is equipped with a positive pressure interlock and a rupture disc.

[0016] Optionally, the RTO combustion furnace is provided with a combustion chamber and a heat storage chamber located below the combustion chamber. A combustion nozzle is provided at the top of the combustion chamber, and the feed end of the combustion nozzle is connected to a material feed pipe.

[0017] Optionally, the bottom of the heat storage chamber is provided with multiple CO channels that communicate with the combustion chamber. The CO channels are connected to the CO exhaust gas pipeline. Between two adjacent CO channels, there is a CO2 exhaust gas channel that communicates with the combustion chamber. The discharge end of the CO2 exhaust gas channel is connected to the exhaust gas tower through the CO2 exhaust gas discharge pipeline.

[0018] Optionally, an induced draft fan is installed on the CO2 exhaust gas discharge line.

[0019] Optionally, the CO tail gas pipeline and the CO2 tail gas discharge pipeline are connected via a tail gas bypass line.

[0020] Through the above technical solution, the liquid-containing industrial carbon monoxide waste gas treatment device provided by this utility model can effectively treat liquid-containing industrial carbon monoxide waste gas, with good implementation effect, and can solve the safety hazards existing in the industrial production process, ensuring the safe operation of industrial production. Attached Figure Description

[0021] Figure 1 Diagram of a CO waste gas treatment device for liquid-containing industries;

[0022] Figure 2 This is a schematic diagram of the RTO combustion furnace process.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Combustion nozzle; 2. Combustion chamber; 3. Heat storage chamber; 4. Exhaust fan; 5. Exhaust gas tower. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0026] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0027] This utility model discloses a method for treating industrial carbon monoxide waste gas containing liquid, the method comprising the following steps:

[0028] S1) Carbon monoxide waste gas containing liquid raw materials is first cooled by a heat exchanger, and then passed through a separator and a wire mesh demister to obtain high-concentration carbon monoxide waste gas;

[0029] S2) Dilute the high-concentration carbon monoxide exhaust gas by introducing diluent through the diluent introduction pipeline, and then enter the RTO combustion furnace for combustion treatment.

[0030] In step S1), the liquid raw material mixed in industrial CO is generally a C9 to C12 alkane.

[0031] In step S1), the liquid carbon monoxide waste gas is cooled by a heat exchanger. The remaining CO waste gas containing a small amount of liquid is then separated by a separator and a wire mesh demister to remove the liquid raw materials in the gas, resulting in high-concentration carbon monoxide waste gas with a concentration of over 99%.

[0032] In step S2), the concentration of carbon monoxide exhaust gas is diluted to below 12.5%, preferably below 0.5%. There are no special requirements for the diluent; for example, air can be used to dilute high-concentration carbon monoxide exhaust gas.

[0033] In step S2), the operating temperature of the RTO combustion furnace can be selected within a wide range, for example, the operating temperature of the RTO combustion furnace can be 700 to 880℃.

[0034] In this invention, a diluent is used to dilute high-concentration carbon monoxide waste gas via a blower. When the blower is operating, there are no special requirements for operating parameters such as the blower inlet damper opening, the blower's rated air volume, and the blower's operating air volume; these can be selected according to actual needs. For example, the blower inlet damper opening can be 10%–45%, and the blower's rated air volume can be 20,000–30,000 m³ / h. 3 / h, the fan operating air volume is converted to 5000~6000Nm 3 / h. In this utility model, the blower power is 45kW and the air volume is 18000Nm. 3 / h. By adjusting the frequency and opening degree of the blower, the CO gas concentration after mixing is 0.5%, far below the lower explosive limit of CO gas (12.5%). This utility model ensures production safety by rationally selecting the power and ventilation volume of the blower.

[0035] See also Figure 1 The diagram shows a liquid-containing industrial CO waste gas treatment device. A second aspect of this utility model provides a liquid-containing industrial carbon monoxide waste gas treatment device. The device includes: a heat exchanger, a liquid separator, a wire mesh demister, and an RTO (Regenerative Thermal Oxide) combustion furnace connected in series via pipelines. A diluent inlet pipeline connects the wire mesh demister and the RTO combustion furnace. The liquid-containing industrial carbon monoxide waste gas is first cooled by the heat exchanger, then passes through the liquid separator and the wire mesh demister to obtain high-concentration carbon monoxide waste gas. Diluent is introduced through the diluent inlet pipeline to dilute the high-concentration carbon monoxide waste gas before it enters the RTO combustion furnace for combustion treatment.

[0036] According to one embodiment of the present invention, the heat exchanger is a graphite block perforated heat exchanger.

[0037] According to one embodiment of the present invention, the graphite block perforated heat exchanger is made of impregnated graphite.

[0038] In this invention, the materials for other equipment are available in a wide range, and those skilled in the art can select the materials according to their needs. For example, the materials for the separating tank and the wire mesh demister described in this invention can be 304 stainless steel.

[0039] According to one embodiment of this utility model, along the direction of the waste gas flow, an oxygen content analyzer, a one-way valve, and a flame arrester are sequentially installed on the pipeline between the wire mesh demister and the diluent inlet pipeline.

[0040] It should be noted that there are no special requirements for the oxygen content analyzer in this invention. For example, an online oxygen content detector commonly used in the prior art can be used, which will not be elaborated here.

[0041] In this invention, the oxygen content analyzer and the RTO combustion furnace inlet valve are interlocked using existing technology. When the online oxygen content detector measures that the oxygen content in the CO exhaust gas reaches 2%, the system immediately alarms and automatically interlocks. The pneumatic inlet valve installed on the CO tail gas pipeline into the RTO furnace closes, the emergency blower starts, and after a 3-second delay, the drain valve of the separator opens. At this time, the CO tail gas is diluted by the emergency blower and then processed through the backup system. This aforementioned scheme ensures production safety.

[0042] In this invention, the one-way valve and the flame arrester structure that prevents combustible gas backfire are well known to those skilled in the art and are not the core inventive points of this invention. Therefore, the one-way valve and the flame arrester structure will not be described in detail. The one-way valve installed in this invention can prevent the ceramic in the regenerator chamber from breaking or becoming blocked after the equipment has been running for a long time, which could cause excessive pressure drop in the bed, increase the pressure at the RTO furnace inlet, and potentially allow air to backflow into the CO tail gas pipeline.

[0043] In this invention, the liquid-containing industrial carbon monoxide waste gas treatment device is equipped with a carbon monoxide alarm, which is installed around potential leak points such as system pipelines and sealing points. The alarm value is set to 12 μmol / mol. The carbon monoxide alarm is interlocked with all the inlet valves of the device using existing technology. Once a leak occurs in the system pipelines or sealing points, the carbon monoxide alarm will automatically sound, and the device will interlock and shut off all inlet valves. After the leak point is eliminated, the device will restart. In this way, this invention uses multiple CO alarms through the aforementioned setup to ensure production safety.

[0044] In this invention, a blower is installed on the diluent inlet pipeline. A blower is located at the inlet of the RTO combustion furnace, and the CO exhaust gas inlet is designed at the blower outlet of the RTO system. The negative pressure generated by the Venturi principle introduces the CO exhaust gas into the RTO combustion furnace for treatment, while the airflow generated by the blower instantly dilutes the CO exhaust gas to below its explosive limit. The diluted CO exhaust gas then enters the RTO for combustion treatment, where it is oxidized and decomposed into CO2 and H2O under high-temperature conditions.

[0045] According to one embodiment of the present invention, the blower is a variable frequency blower.

[0046] According to one embodiment of the present invention, an air inlet valve is installed at the feed end of the RTO combustion furnace, and the air inlet valve of the RTO combustion furnace is interlocked with the oxygen content analyzer using existing technology.

[0047] According to one embodiment of this utility model, along the material flow direction, the discharge end of the RTO combustion furnace is connected in series with a buffer tank and a chimney. The CO waste gas, after being fully combusted in the RTO combustion furnace, is collected in the buffer tank along with the resulting liquid, while the CO2 gas is discharged through a tail gas tower and a chimney.

[0048] According to one embodiment of this utility model, the inlet pipe of the RTO combustion furnace is equipped with a flame arrester and a one-way valve; the outlet pipe of the RTO combustion furnace adopts the anti-static design of electrostatic bridging and electrostatic grounding in the prior art to prevent electrostatic sparks from occurring during gas flow.

[0049] According to one embodiment of this utility model, the RTO combustion furnace adopts the positive pressure interlocking technology in the prior art. For example, the furnace pressure detection device of the RTO combustion furnace is interlocked with the gas feed valve and CO waste gas feed valve of the RTO furnace in the prior art. In this way, if the induced draft fan fails and stops operating during the operation of the RTO furnace, the waste gas in the RTO furnace cannot be discharged in time, which may lead to accidents such as fire or even explosion in the furnace body. The system will automatically shut down the furnace by performing positive pressure interlocking, stopping the gas feed, stopping the heating of the RTO furnace, and interlocking the direct discharge of CO waste gas to prevent CO waste gas from entering the RTO furnace for combustion.

[0050] According to one embodiment of this utility model, a rupture disc is installed on the side of the RTO combustion furnace. The rupture disc is located on the side of the furnace chamber and serves as overpressure protection, releasing pressure through the rupture disc when the furnace chamber is overpressured. This is the system's last self-protection measure, safely dispersing energy in the event of an explosion to prevent personnel injury and equipment damage.

[0051] See Figure 2According to one embodiment of the present invention, the RTO combustion furnace is provided with a combustion chamber 2 and a heat storage chamber 3 located below the combustion chamber. The heat storage chamber 3 and the combustion chamber 2 are connected. CO exhaust gas is heated in the heat storage chamber 3 and then enters the combustion chamber 2 for combustion.

[0052] According to one embodiment of the present invention, a combustion nozzle 1 is provided at the top of the combustion chamber, and a material feeding pipe is connected to the feed end of the combustion nozzle 1.

[0053] According to one embodiment of the present invention, the bottom of the heat storage chamber 3 is provided with a plurality of CO channels communicating with the combustion chamber 2. The CO channels are connected to the CO exhaust gas pipeline. Between two adjacent CO channels, a CO2 exhaust gas channel communicating with the combustion chamber 2 is provided. The discharge end of the CO2 exhaust gas channel is connected to the exhaust gas tower 5 through the CO2 exhaust gas discharge pipeline.

[0054] According to one embodiment of this utility model, an induced draft fan 4 is installed on the CO2 exhaust gas outlet pipeline. The induced draft fan can be any commonly used induced draft fan in the art, and will not be described in detail here. In this utility model, the induced draft fan has a power of 75kW and an air volume of 260,000Nm³. 3 / h. Based on calculations, the system adjusts the frequency and opening of the induced draft fan. Under normal operating conditions, the combustion chamber maintains a slight negative pressure of -500 to -1000 Pa, with a measured airflow of 4000 to 7500 Nm³. 3 / min. This utility model ensures production safety by rationally selecting the power and ventilation volume of the induced draft fan.

[0055] According to one embodiment of this utility model, the CO tail gas pipeline and the CO2 tail gas discharge pipeline are connected through a tail gas sub-line. When the RTO combustion furnace malfunctions, the CO tail gas is directly discharged into the air through the tail gas sub-line.

[0056] By adopting the aforementioned preferred solution, the safety hazards existing in the process of carbon monoxide waste gas treatment can be effectively solved, ensuring production safety.

[0057] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A device for treating industrial carbon monoxide waste gas containing liquid, characterized in that, The device includes: A heat exchanger, a liquid separator, a wire mesh demister, and an RTO (Regenerative Thermal Oxide) combustion furnace are connected in series via pipelines. A diluent inlet pipeline connects the wire mesh demister and the RTO combustion furnace. Liquid industrial carbon monoxide waste gas is first cooled by the heat exchanger, and then passes through the liquid separator and the wire mesh demister to obtain high-concentration carbon monoxide waste gas. The high-concentration carbon monoxide waste gas is diluted with diluent through the diluent inlet pipeline, and then enters the RTO combustion furnace for combustion treatment.

2. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, The heat exchanger is a graphite block perforated heat exchanger.

3. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, Along the direction of the exhaust gas flow, an oxygen content analyzer, a one-way valve, and a flame arrester are installed sequentially on the pipeline between the wire mesh demister and the diluent inlet pipeline.

4. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, The liquid-containing industrial carbon monoxide waste gas treatment device is equipped with a carbon monoxide alarm.

5. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, A blower is installed on the diluent inlet pipeline; and / or the blower is a variable frequency blower.

6. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, An air inlet valve is installed at the feed end of the RTO combustion furnace, and the air inlet valve of the RTO combustion furnace is interlocked with the oxygen content analyzer.

7. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, Along the material flow direction, the discharge end of the RTO combustion furnace is connected in series with the buffer tank and the chimney; and / or The RTO combustion furnace inlet pipe is equipped with a flame arrester and a check valve, and the outlet pipe is designed to prevent static electricity; and / or The RTO combustion furnace is equipped with positive pressure interlock and rupture disc.

8. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, The RTO combustion furnace is provided with a combustion chamber (2) and a heat storage chamber (3) located below the combustion chamber. A combustion nozzle (1) is provided at the top of the combustion chamber, and a material feeding pipe is connected to the feed end of the combustion nozzle (1).

9. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, The bottom of the heat storage chamber (3) is provided with multiple CO channels that are connected to the combustion chamber (2). The CO channels are connected to the CO tail gas pipeline. Between two adjacent CO channels, there is a CO2 tail gas channel that is connected to the combustion chamber (2). The discharge end of the CO2 tail gas channel is connected to the tail gas tower (5) through the CO2 tail gas discharge pipeline.

10. The device for treating liquid-containing industrial carbon monoxide waste gas according to claim 1, characterized in that, An induced draft fan (4) is installed on the CO2 exhaust gas outlet pipeline; and / or The CO tail gas pipeline and the CO2 tail gas discharge pipeline are connected via a tail gas bypass line.

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