Molten salt furnace tail gas carbon dioxide recycling device

Abstract

The utility model relates to the technical field of potash tail gas recovery treatment, in particular to a molten salt furnace tail gas carbon dioxide recycling device, which is characterized in that a spray head and a filler positioned on the lower side of the spray head are arranged in a tail gas absorption tower, and a dilution water pipeline, an alkali liquor supplementing pipeline and a cooling medium pipeline are arranged on the tail gas absorption tower; one end of the tail gas absorption tower is connected with a molten salt furnace tail gas pipeline located at the bottom of the filler, the other end of the tail gas absorption tower is connected with a potassium carbonate circulation tank through an absorption liquid circulation tank liquid phase pipeline, and the potassium carbonate finished product tank is connected with a finished product storage tank feeding pipeline; a circulating pump is connected between the finished product storage tank feeding pipeline and the potassium carbonate circulating tank, circulating heat exchangers are arranged on the finished product storage tank feeding pipeline and the cooling medium pipeline, a tail gas fan is arranged at the top of the tail gas absorption tower, and the tail gas fan is connected with the tail gas absorption tower through a waste gas discharge pipeline; the equipment cost is obviously reduced, the environmental protection benefit is prominent, and the process is optimized and efficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of potassium base tail gas recovery treatment, and particularly to a molten salt furnace tail gas carbon dioxide recycling device. BACKGROUND

[0002] In the field of potassium hydroxide flake alkali production process in modern industry, the molten salt furnace plays a very key role, and it is an indispensable heating equipment for solid alkali device, relies on water gas as heat source, thereby provides necessary heat for the molten salt system, under the ideal raw material full combustion condition, in addition to containing other components, the content of carbon dioxide gas in the molten salt furnace tail gas is considerable.

[0003] At present, chemical enterprises have developed and applied a variety of technical means to cope with carbon dioxide pollution problems, among which absorption method, membrane separation method, compression condensation method and the like are more common, however, these technologies all face many challenges in the actual application process, the absorption method has certain absorption effect, but in the separation and purification link of carbon dioxide, the process complexity is higher, a large amount of manpower and material resources need to be invested for operation and management, and many equipment are involved, the land occupation area is large, so that the investment cost is high, at the same time, the energy consumption in the running process is high, which further increases the production cost.

[0004] Therefore, in view of the above technical problems, a molten salt furnace tail gas carbon dioxide recycling device is provided to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiencies in the above background technology, the utility model provides a molten salt furnace tail gas carbon dioxide recycling device, which solves the technical problems that the absorption method has certain absorption effect, but in the separation and purification link of carbon dioxide, the process complexity is higher, a large amount of manpower and material resources need to be invested for operation and management, and the performance requirement of membrane material for membrane separation method is harsh, the preparation cost of high-quality membrane material is high, and the service life of the membrane is limited, and the compression condensation method needs complex and expensive equipment, the operation condition is strict, the professional skill requirement of the operator is high.

[0006] The utility model discloses a technical scheme is such realization: a molten salt furnace tail gas carbon dioxide recycling device, including tail gas absorption tower and potassium carbonate circulating tank and potassium carbonate finished product tank, its characterized in that: the tail gas absorption tower inside is equipped with shower head and is located the packing of shower head downside, the tail gas absorption tower on be equipped with dilution water pipeline and supplementary lye pipeline and cooling medium pipeline, all with the access end connection of shower head, the tail gas absorption tower one end is connected with the molten salt furnace tail gas pipeline of being located the packing bottom, the other end is connected with the potassium carbonate circulating tank between through the absorption liquid circulating tank liquid phase pipeline connection, the potassium carbonate finished product tank is connected with the send into finished product storage tank pipeline, the send into finished product storage tank pipeline with cooling medium pipeline between the connection of potassium carbonate circulating tank is equipped with circulating pump, the send into finished product storage tank pipeline and cooling medium pipeline on be equipped with circulating heat exchanger, the tail gas absorption tower top is equipped with tail gas fan, the tail gas fan with tail gas absorption tower between through waste gas exhaust pipeline connection.

[0007] As a preferred scheme, it further includes a make-up air pipeline, the make-up air pipeline is connected with the inlet end of the tail gas fan, and the make-up air pipeline is provided with an air filter device.

[0008] As a preferred scheme, the absorption liquid circulating tank liquid phase pipeline is provided with a reverse U-shaped pipeline, so that the liquid level can accurately reach 70% overflow.

[0009] As a preferred scheme, the packing is a saddle-shaped packing, and the saddle-shaped packing is layered filled in the tail gas absorption tower, the height of each layer of packing is 0.3 m-1 m, and a gas redistribution device is arranged between the adjacent two layers of packing, the gas redistribution device adopts a porous plate structure, and the pore diameter is 5 mm-15 mm.

[0010] As a preferred scheme, the supplementary lye pipeline and the dilution water pipeline are respectively provided with flow monitoring and adjusting devices, so that the potassium hydroxide concentration in the absorption liquid is 8%-14%.

[0011] As a preferred scheme, the circulating heat exchanger adopts a plate heat exchanger, the inner plate of the plate heat exchanger adopts a corrugated structure, the corrugated depth is 3 mm-8 mm, the corrugated spacing is 5 mm-12 mm, the plate material is stainless steel or titanium alloy, and the sealing between the plates adopts a high-performance rubber sealing gasket.

[0012] As a preferred scheme, the air filter device adopts a multi-stage filtering structure, including primary efficiency filtration, intermediate efficiency filtration and high efficiency filtration, the primary efficiency filtration adopts a non-woven fabric material, the intermediate efficiency filtration adopts a glass fiber filter paper material, the high efficiency filtration adopts a HEPA filter paper material, and the air filter device is provided with a differential pressure monitoring device.

[0013] As a preferred scheme, the liquid level in the tail gas absorption tower is higher than the inlet end of the molten salt furnace tail gas pipeline.

[0014] As a preferred solution, the upper part of the tail gas absorption tower is provided with a mist eliminator, and the mist eliminator adopts a wire mesh mist elimination structure, and the mist elimination efficiency can ensure that the mist droplet concentration in the outlet smoke is not more than 75 mg / NM 3 .

[0015] As a preferred solution, the potassium carbonate finished product tank adopts a sealed and moisture-proof structure, the tank body is provided with a capacity monitoring device, and the top is provided with a safety discharge device.

[0016] The beneficial effects of the utility model are:

[0017] I. The cost is significantly reduced. In the traditional potassium hydroxide production process mode, the carbon dioxide in the molten salt furnace tail gas is usually directly discharged into the atmosphere after simple treatment such as desulfurization and denitrification, which not only causes the waste of carbon dioxide resources, but also increases the environmental protection pressure faced by enterprises. At the same time, the enterprise needs to purchase a large amount of potassium carbonate as raw material from the outside in the primary brine refining link to ensure that the calcium ions in the brine can be removed as much as possible. This procurement behavior undoubtedly increases the raw material cost of the enterprise, and in the procurement process, it also involves a series of links such as transportation and storage, further increasing the operating cost of the enterprise.

[0018] The molten salt furnace tail gas carbon dioxide recycling device provided by the utility model ingeniously utilizes the alkali liquor to absorb the carbon dioxide in the tail gas, so that the carbon dioxide is chemically reacted to generate potassium carbonate. This process realizes the conversion of the originally discarded carbon dioxide into valuable potassium carbonate products, so that the enterprise does not need to purchase a large amount of potassium carbonate from the outside for primary brine refining, thereby effectively reducing the raw material procurement cost. In addition, by optimizing the device structure and process, such as improving the absorption efficiency of carbon dioxide and reducing energy consumption, the energy consumption cost and equipment maintenance cost in the production process can also be reduced to a certain extent, thereby significantly reducing the system operation cost of the enterprise from multiple aspects and improving the economic benefit of the enterprise.

[0019] II. The environmental protection benefit is outstanding. The core of the utility model is to realize the recycling and recycling of carbon dioxide, which effectively converts the carbon dioxide originally discharged into the atmosphere as a pollutant into a reusable resource. This measure directly reduces the amount of carbon dioxide discharged into the atmosphere by the enterprise, which has a positive and important significance for relieving the carbon emission pressure. In the background of actively responding to climate change and striving to achieve the carbon emission reduction target worldwide, the utility model provides a feasible carbon dioxide emission reduction solution for chemical enterprises, which helps the enterprise to better fulfill its social responsibility and conforms to the concept of sustainable development, and makes a positive contribution to environmental protection.

[0020] III. The process is optimized and efficient. The device structure and scientific and reasonable process are carefully designed, the overall optimization of the carbon dioxide recycling process is realized, for example, specific saddle-shaped fillers are used in the tail gas absorption tower, and combined with reasonable filling mode and gas redistribution device, the contact area and contact efficiency between the tail gas and the absorption liquid are greatly improved, thereby accelerating the absorption reaction process of carbon dioxide, at the same time, the concentration, temperature and flow of the absorption liquid are accurately controlled, the efficient and stable absorption reaction is ensured, the problems such as potassium carbonate and potassium hydroxide crystallization are prevented, and the long-term stable operation of the device is ensured, in addition, the frequency conversion speed regulation function of the tail gas fan, the efficient heat transfer characteristics of the plate heat exchanger and the multi-stage filtering effect of the air filtering device further improve the performance and reliability of the whole system, so that the carbon dioxide recycling process is more efficient, energy-saving and environmentally friendly.

[0021] Other advantages, objects and features of the present application will be set forth in part in the following description, and in part will become apparent to those skilled in the art from the examination of the following specification, or can be learned from practice of the present application. The objects and advantages of the present application can be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0023] Figure 1 It is the overall schematic diagram of the present application.

[0024] In the figure: 1: tail gas absorption tower, 2: potassium carbonate circulating tank, 3: potassium carbonate finished product tank, 4: spray head, 5: filler, 6: dilution water pipeline, 7: supplementary lye pipeline, 8: cooling medium pipeline, 9: molten salt furnace tail gas pipeline, 10: absorption liquid circulating tank liquid phase pipeline, 11: sent into finished product storage tank pipeline, 12: circulating pump, 13: circulating heat exchanger, 14: tail gas fan, 15: waste gas exhaust pipeline, 16: air supplement pipeline, 17: inverted U-shaped pipeline. DETAILED DESCRIPTION

[0025] The drawings needed in the embodiment description of the present application will be described below. Figure 1In order to clearly and completely describe the technical solutions in the embodiments of the present application, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] Embodiment 1, a molten salt furnace tail gas carbon dioxide recycling device, comprising a tail gas absorption tower 1, a potassium carbonate circulating tank 2 and a potassium carbonate finished product tank 3, characterized in that: the tail gas absorption tower 1 is internally provided with a spray head 4 and a filler 5 located at the lower side of the spray head 4, the tail gas absorption tower 1 is provided with a dilution water pipeline 6, a supplementary lye pipeline 7 and a cooling medium pipeline 8, one end of the dilution water pipeline 6 is connected with an external water source or a recovered water system, the other end is connected with the dilution water inlet of the spray head 4 through a specific shunt joint, the shunt joint can ensure that the dilution water enters the spray head 4 uniformly and stably, and is used for adjusting the concentration of the absorption liquid sprayed by the spray head 4; one end of the supplementary lye pipeline 7 is connected with a lye storage or supply device, the other end is connected with the lye inlet of the spray head 4 through an independent connecting pipe, the connecting pipe is provided with an anti-backflow device, and is used for supplementing fresh lye or recovered alkaline water to the spray head 4, so as to maintain the excessive state of potassium hydroxide; one end of the cooling medium pipeline 8 is connected with a cooling medium supply system, and the other end is connected with the cooling medium inlet of the plate heat exchanger 13 in the tail gas absorption tower 1, the plate heat exchanger 13 is connected with the spray head 4 through a heat exchange loop, and the cooling medium is returned to the cooling medium supply system after heat exchange with the absorption liquid in the plate heat exchanger 13, and is used for removing the heat generated by the reaction of the tail gas and the absorption liquid; one end of the tail gas absorption tower 1 is connected with a molten salt furnace tail gas pipeline 9 located at the bottom of the filler 5, the tail gas enters the tail gas absorption tower 1 along the tangential direction through the pipeline, and the other end is connected with the potassium carbonate circulating tank 2 through a tail gas absorption tower to absorption liquid circulating tank liquid phase pipeline 10, which is used for conveying the absorption liquid after absorbing the tail gas to the potassium carbonate circulating tank 2; the potassium carbonate finished product tank 3 is connected with the potassium carbonate circulating tank 2 through a finished product potassium carbonate into finished product storage tank pipeline 11, which is used for conveying the finished product potassium carbonate meeting the concentration requirement in the potassium carbonate circulating tank 2 to the potassium carbonate finished product tank 3; the potassium carbonate circulating tank 2 and the tail gas absorption tower 1 are connected through a potassium carbonate circulating pump 12, the liquid inlet of the potassium carbonate circulating pump 12 is located at the bottom of the potassium carbonate circulating tank 2, the liquid outlet is connected with the spray head 4 of the tail gas absorption tower 1 through a pipeline, and is used for conveying the absorption liquid in the potassium carbonate circulating tank 2 back to the tail gas absorption tower 1, so as to realize the recycling of the absorption liquid; the tail gas absorption tower 1 is provided with a tail gas fan 14 at the top, and the tail gas fan 14 is connected with the tail gas absorption tower 1 through a waste gas discharge pipeline 15, and the tail gas fan 14 is used for discharging the treated tail gas to the atmosphere.

[0027] As a further implementation, the spray head 4 adopts an atomizing spray head structure, the spray head aperture ranges from 0.5mm to 2mm, the spray angle ranges from 60° to 120°, and the spray head is internally provided with a cyclone device, which can make the sprayed absorption liquid form uniform mist droplets, ensuring that the sprayed potassium hydroxide solution can uniformly cover the filler 5 area and form a good gas-liquid contact effect.

[0028] As a further implementation, the saddle-shaped filler 5 is layered in the tail gas absorption tower 1, the height of each layer of filler 5 ranges from 0.3m to 1m, and a gas redistribution device is arranged between the adjacent two layers of filler 5, which adopts a perforated plate structure with a hole diameter of 5mm to 15mm, and the perforated plate is uniformly provided with raised shunt edges, which can further disperse the gas and make the gas uniformly distributed, avoiding the occurrence of channeling or biasing phenomenon and improving the gas-liquid contact efficiency.

[0029] As a further implementation, the circulating heat exchanger 13 adopts a plate heat exchanger, the internal plate of which adopts a corrugated structure with a corrugation depth of 3mm to 8mm and a corrugation pitch of 5mm to 12mm, the plate material is stainless steel or titanium alloy, the sealing between the plates adopts high-performance rubber gasket, the Shore hardness of the gasket ranges from 60 to 80, and the plate is provided with a flow guide groove, which can guide the flow direction of the cooling medium and the absorption liquid, improve the heat transfer efficiency, and the plate heat exchanger is provided with an online cleaning and maintenance device, which adopts a high-pressure water gun cleaning method, can clean and maintain the inside of the heat exchanger without affecting the normal operation of the system, remove dirt and impurities on the surface of the plate, and ensure that the heat transfer performance of the heat exchanger is stable for a long time.

[0030] As a further implementation, the liquid level inside the tail gas absorption tower 1 is higher than the inlet end of the molten salt furnace tail gas pipeline 9 by 0.1m to 0.5m, and the bottom of the tail gas absorption tower 1 is provided with an inclined flow guide plate with an inclination angle of 30° to 60°, which can guide the absorption liquid to flow to the absorption liquid circulation tank liquid phase pipeline 10 and prevent the accumulation of liquid from affecting the tail gas inlet.

[0031] Working principle: the molten salt furnace tail gas enters the tail gas absorption tower 1 through the molten salt furnace tail gas pipeline 9 in the tangential direction, and is countercurrently contacted with the diluted potassium hydroxide liquid sprayed from the spray head 4 in the tower. Potassium hydroxide reacts with carbon dioxide in the tail gas to generate potassium carbonate and water. This reaction is an exothermic reaction. At the same time, the cooling medium (such as chilled water) enters the plate heat exchanger 13 through the cooling medium pipeline 8 and exchanges heat with the absorption liquid. The heat generated by the absorption reaction is returned to the cooling medium supply system, so that the temperature of the absorption liquid is controlled within a suitable range (such as 40°C), ensuring that the reaction continues to proceed efficiently. The reacted absorption liquid flows into the potassium carbonate circulating tank 2 through the tail gas absorption tower to the absorption liquid circulating tank liquid phase pipeline 10. Part of the absorption liquid is transported back to the spray head 4 by the potassium carbonate circulating pump 12 for recycling. Another part reaches a certain concentration and enters the finished product storage tank pipeline 11 into the finished product storage tank 3. The treated tail gas is discharged to the atmosphere through the exhaust gas discharge pipeline 15 by the tail gas fan 14.

[0032] In use, during installation, ensure that the dilution water pipeline 6, the alkali liquid supplement pipeline 7 and the cooling medium pipeline 8 are tightly and correctly connected with the spray head 4. The installation of the shunt joint and the connecting pipe meets the design requirements to prevent leakage and backflow. The connection angle and position of the molten salt furnace tail gas pipeline 9 and the tail gas absorption tower 1 should ensure that the tail gas can smoothly enter the tower in the tangential direction. The heat exchange loop connection between the plate heat exchanger 13 and the spray head 4 is accurate to ensure effective heat transfer.

[0033] During operation, adjust the flow and pressure of the external water source or the recycled water system, the alkali liquid storage or supply device and the cooling medium supply system according to the process requirements to ensure stable supply of the medium in each pipeline. Regularly check the sealing of each pipeline, joint and valve to prevent leakage. Monitor the reaction conditions in the tail gas absorption tower 1, such as temperature, pressure and absorption effect, and fine-tune the parameters of each system according to the actual situation.

[0034] Example 2: A molten salt furnace tail gas carbon dioxide recovery and utilization device, based on example 1, the tail gas absorption tower 1 is also provided with a liquid level monitoring device. The liquid level monitoring device is located at the bottom of the tail gas absorption tower 1 or a position associated with the liquid level of the bottom of the tail gas absorption tower 1. The measurement accuracy is ± 5 mm. The liquid level monitoring device uses a capacitive liquid level sensor to monitor the liquid level height in the tail gas absorption tower 1 in real time by detecting the change of the capacitance value caused by the change of the liquid level. It is linked with the control valves of the dilution water pipeline 6 and the absorption liquid circulating tank liquid phase pipeline 10. When the liquid level is lower or higher than the set value, the opening of the corresponding valve is automatically adjusted to maintain the stability of the liquid level in the tail gas absorption tower 1 and ensure the normal progress of the absorption reaction.

[0035] Working principle: The capacitive liquid level sensor detects the change of capacitance value caused by the change of liquid level in the tail gas absorption tower 1, and monitors the liquid level in real time. When the liquid level is lower than the set lower limit value, the liquid level monitoring device sends a signal to the control system, and the control system automatically adjusts the control valve of the dilution water pipeline 6 to increase the inflow of dilution water and raise the liquid level. When the liquid level is higher than the set upper limit value, adjust the control valve of the absorption liquid circulating tank liquid phase pipeline 10 to speed up the outflow of absorption liquid and lower the liquid level, so as to ensure that the absorption reaction proceeds normally under stable liquid level conditions.

[0036] In use, when installing the capacitive liquid level sensor, ensure that its installation position is accurate, and that the connection with the bottom of the tail gas absorption tower 1 or the associated position is firm and sealed. Connect the liquid level monitoring device with the control system correctly, and calibrate it to ensure that the measurement accuracy reaches ±5mm. Debug the control valves of the dilution water pipeline 6 and the absorption liquid circulating tank liquid phase pipeline 10 to make them accurately act according to the signal of the liquid level monitoring device.

[0037] During operation, periodically check the working state of the liquid level monitoring device, including the accuracy of the sensor and the stability of signal transmission, etc. At the same time, observe the liquid level control effect, and optimize and adjust the upper and lower limit set values of the liquid level according to the actual situation to adapt to the needs under different working conditions.

[0038] In example 3, a molten salt furnace tail gas carbon dioxide recovery and utilization device is provided, which is based on example 1. The supplementary alkali liquid pipeline 7 and the dilution water pipeline 6 are respectively provided with flow monitoring and adjusting devices. The flow monitoring device uses an electromagnetic flowmeter with a measurement accuracy of ±0.1L / min. The adjusting device uses an electric adjusting valve, which can automatically or manually adjust the flow of alkali liquid and dilution water according to process requirements and absorption liquid concentration monitoring results, to ensure that the potassium hydroxide concentration in the absorption liquid is stable at 8%-14%, maintain good absorption effect, and when the potassium hydroxide concentration exceeds the set range, the system sends an alarm signal which is displayed through a sound and light alarm.

[0039] As a further embodiment, the supplementary alkali liquid pipeline 7 and the dilution water pipeline 6 are respectively provided with flow monitoring and adjusting devices. The flow monitoring device uses an electromagnetic flowmeter with a measurement accuracy of ±0.1L / min. The adjusting device uses an electric adjusting valve, which can automatically or manually adjust the flow of alkali liquid and dilution water according to process requirements and absorption liquid concentration monitoring results, to ensure that the potassium hydroxide concentration in the absorption liquid is stable at 8%-14%, maintain good absorption effect, and when the potassium hydroxide concentration exceeds the set range, the system sends an alarm signal which is displayed through a sound and light alarm.

[0040] Working principle: The electromagnetic flowmeter measures the liquid flow in the alkali solution supplement pipeline 7 and the dilution water pipeline 6 in real time and transmits the measurement signal to the control system. The control system calculates the required flow of alkali solution and dilution water according to the preset potassium hydroxide concentration range (8%-14%) and the absorption liquid concentration monitoring results, and then automatically adjusts the valve opening through the electric regulating valve to accurately control the flow. When the potassium hydroxide concentration exceeds the set range, the control system triggers the audible and visual alarm to issue an alarm signal, reminding the operator to intervene, such as adjusting the raw material supply or checking the equipment operation, etc.

[0041] In use, when installing the electromagnetic flowmeter and electric regulating valve, follow the device instructions for correct installation and wiring to ensure normal measurement and adjustment functions. Before system startup, calibrate the electromagnetic flowmeter and set appropriate flow measurement range and accuracy (±0.1 L / min). According to process requirements, set the target value and upper and lower limit range of potassium hydroxide concentration in the control system.

[0042] During operation, periodically check the working performance of the flow monitoring and adjusting device, including the accuracy of the flowmeter and the action flexibility of the regulating valve, etc. According to the actual monitoring data of the absorption liquid concentration, timely adjust the parameters of the control system to ensure that the potassium hydroxide concentration is stable within the set range. At the same time, periodically test the audible and visual alarm to ensure normal alarm function.

[0043] In Example 4, a molten salt furnace tail gas carbon dioxide recovery and utilization device is provided, which is based on Example 1 and further includes a makeup air pipeline 16 connected to the inlet end of the tail gas fan 14. The makeup air pipeline 16 is provided with an air filtration device. The air filtration device adopts a multi-stage filtration structure, including primary filtration, intermediate filtration, and high-efficiency filtration. The primary filtration uses non-woven fabric with a fiber diameter of 10-50 μm. The intermediate filtration uses glass fiber filter paper with a pore size of 1-10 μm. The high-efficiency filtration uses HEPA filter paper with a filtration efficiency of 0.3 μm particles of 99.97% or more. The air filtration device is provided with a differential pressure monitoring device, which uses a differential pressure transmitter with a measurement accuracy of ±50 Pa. When the differential pressure across the filtration device exceeds the set value, the control system prompts replacement or cleaning of the filter element. The control system is connected to the central control room in the production site, enabling remote monitoring.

[0044] Working principle: when the exhaust fan 14 runs, causing the system negative pressure to increase, air enters the system through the air supplement pipeline 16. The air first passes through the primary efficiency filter, and the non-woven fabric material of the primary efficiency filter uses its fiber diameter (10 μm-50 μm) to intercept and filter larger particles of dust and other impurities in the air; then passes through the medium efficiency filter, and the glass fiber filter paper material of the medium efficiency filter further filters smaller particle impurities by virtue of its pore size (1 μm-10 μm); finally, passes through the high efficiency filter, and the HEPA filter paper material of the high efficiency filter has a filtration efficiency of 99.97% or more for 0.3 μm particles, ensuring that the air entering the system is clean and pollution-free. The differential pressure transmitter monitors the pressure difference between the two ends of the air filtration device in real time, and when the pressure difference exceeds the set value, sends a signal to the control system, prompting the operator to replace or clean the filter element to ensure the filtering effect.

[0045] In use, when installing the air supplement pipeline 16, ensure that it is firmly and sealingly connected with the inlet end of the exhaust fan 14, and the filters of the air filtration device are correctly installed in order to ensure smooth air flow. The differential pressure transmitter is installed in the appropriate position to accurately measure the pressure difference between the two ends of the filtration device and is reliably connected with the control system.

[0046] During operation, periodically check the sealing of the air supplement pipeline 16 and the air filtration device to prevent air leakage, and replace or clean the filter element according to the specified period, which can generally be determined according to the pressure difference trend and production experience. At the same time, periodically check the connection between the control system and the central control room to ensure that the remote monitoring function is normal, so as to obtain abnormal pressure difference information in time.

[0047] Example 5, a molten salt furnace exhaust gas carbon dioxide recovery and utilization device, based on example 1, the upper part of the exhaust gas absorption tower 1 is provided with a demister, the demister adopts a wire mesh demisting structure, the wire mesh material of the wire mesh demister is stainless steel or polytetrafluoroethylene, the wire diameter is 0.1 mm-0.5 mm, and the number of wire mesh layers is 3-10, which can ensure that the mist droplet concentration in the outlet smoke is not more than 75 mg / NM 3 The lower part of the demister is provided with a liquid collection tank, and the collection tank is connected with the liquid circulation tank pipeline 10 through a pipeline to return the collected liquid to the circulation system.

[0048] Working principle: the treated tail gas passes through the wire mesh demister during the rising process, the mist droplets in the tail gas are intercepted and gathered by the wire mesh to form droplets due to the inertia and surface tension effect when contacting the wire mesh made of stainless steel or polytetrafluoroethylene material, the droplets continuously increase and flow down along the wire mesh under the action of gravity and fall into the liquid accumulation collecting tank below, the liquid accumulation collecting tank is connected with the liquid phase pipeline 10 of the absorption liquid circulating tank through the pipeline, so that the collected liquid is returned to the circulating system to participate in the absorption reaction or other process again, while ensuring that the mist droplet concentration in the tail gas is not greater than 75 mg / NM 3 , reaching the environmental protection emission standard.

[0049] In use, when installing the wire mesh demister, it is necessary to ensure that it is firmly and horizontally installed, the material and wire diameter (0.1 mm-0.5 mm) of the wire mesh and the number of layers (3-10 layers) meet the design requirements to ensure the demisting efficiency. The liquid accumulation collecting tank is installed at a suitable position and is tightly connected with the wire mesh demister and the pipeline to prevent liquid leakage.

[0050] During operation, the demisting effect of the wire mesh demister is checked regularly, which can be evaluated by detecting the mist droplet concentration in the outlet smoke, if the demisting effect is found to be decreased, check whether the wire mesh is blocked or damaged, and clean or replace it in time, at the same time, check whether the liquid accumulation collecting tank and the pipeline are unobstructed to ensure that the liquid can be returned to the circulating system smoothly.

[0051] In example 6, a molten salt furnace tail gas carbon dioxide recovery and utilization device is provided, based on example 1, the potassium carbonate finished product tank 3 adopts a sealed and moisture-proof structure, the tank body adopts a double-layer structure, the inner layer is made of stainless steel material, the outer layer is made of carbon steel material, and the middle is filled with heat insulation material, the tank body is provided with a capacity monitoring device, the capacity monitoring device adopts an ultrasonic liquid level meter, the measurement accuracy is ±0.05m 3 , the storage amount of potassium carbonate in the finished product tank can be monitored in real time, at the same time, a safety discharge device is arranged at the top of the finished product tank, the safety discharge device adopts a combination of a safety valve and a breather valve, the opening pressure of the safety valve is 0.1 MPa-0.3 MPa, the exhalation pressure of the breather valve is 0.05 MPa-0.15 MPa, the inhalation pressure is -0.03 MPa--0.01 MPa, the safety valve can be automatically opened when the pressure in the tank exceeds the set safety value, and the pressure in the tank can be rapidly released, the breather valve can automatically adjust the gas in and out to maintain the balance of the pressure in the tank, and prevent the outside air from entering the tank to cause the potassium carbonate to be damp and deteriorated.

[0052] Working principle: The double-layer tank body structure of potassium carbonate finished product tank 3, the inner layer of stainless steel material ensures that the product quality is not polluted, the outer layer of carbon steel material provides structural strength, the intermediate thermal insulation material reduces the influence of the external environment on the temperature in the tank, maintains the stable state of potassium carbonate, the ultrasonic liquid level meter calculates the liquid level height of potassium carbonate in the tank according to the sound wave propagation time by transmitting and receiving ultrasonic signals, realizes real-time capacity monitoring (measurement accuracy is ±0.05m 3 ), the safety valve is automatically opened when the pressure in the tank exceeds the set safety value (0.1MPa-0.3MPa), releases the pressure, prevents the tank body from being broken; the breathing valve automatically adjusts the gas in and out when the pressure in the tank changes, maintains the pressure balance in the tank within the exhalation pressure (0.05MPa-0.15MPa) and inhalation pressure (-0.03MPa--0.01MPa) range, while preventing external air from entering to cause potassium carbonate to be damp and deteriorated.

[0053] In use, when manufacturing potassium carbonate finished product tank 3, the appropriate materials and processes should be selected according to the design requirements to ensure the sealing and thermal insulation performance of the double-layer structure of the tank body. When installing the ultrasonic liquid level meter, safety valve and breathing valve, their installation position should be accurate, the connection should be firm and sealed, the liquid level meter and safety discharge device should be calibrated and debugged to make them work normally.

[0054] During storage, the sealing condition of the tank body should be checked regularly to prevent leakage, the measurement data of the ultrasonic liquid level meter should be observed to timely grasp the storage amount of potassium carbonate in the finished product tank, the production and transportation plan should be reasonably arranged, the working state of the safety valve and the breathing valve should be checked regularly, which can be tested by simulating pressure changes to ensure that they can act in time when the pressure is abnormal, and the safe operation of the finished product tank is ensured.

[0055] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixed", and similar terms should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0056] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A molten salt furnace tail gas carbon dioxide recovery and utilization device, comprising a tail gas absorption tower (1) and a potassium carbonate circulating tank (2) and a potassium carbonate finished product tank (3), characterized in that: The tail gas absorption tower (1) is internally provided with a spray head (4) and a filler (5) located at the lower side of the spray head (4), the tail gas absorption tower (1) is provided with a dilution water pipeline (6), a supplementary lye pipeline (7) and a cooling medium pipeline (8), which are all connected with the access end of the spray head (4), one end of the tail gas absorption tower (1) is connected with a molten salt furnace tail gas pipeline (9) located at the bottom of the filler (5), the other end is connected with a potassium carbonate circulating tank (2) through an absorption liquid circulating tank liquid phase pipeline (10), the potassium carbonate finished product tank (3) is connected with a finished product storage tank feeding pipeline (11), the finished product storage tank feeding pipeline (11) and the cooling medium pipeline (8) are provided with a circulating heat exchanger (13), the top of the tail gas absorption tower (1) is provided with a tail gas fan (14), the tail gas fan (14) and the tail gas absorption tower (1) are connected through a waste gas discharge pipeline (15).

2. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, Further comprising a make-up air pipeline (16), the make-up air pipeline (16) is connected with the inlet end of the tail gas fan (14), the make-up air pipeline (16) is provided with an air filtering device.

3. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, The absorption liquid circulating tank liquid phase pipeline (10) is provided with a reverse U-shaped pipeline (17), which ensures that the liquid level can accurately reach 70% overflow.

4. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, The filler (5) is a saddle-shaped filler, the saddle-shaped filler is layered filled in the tail gas absorption tower (1), the height of each layer of the filler (5) is 0.3m-1m, a gas redistribution device is arranged between the adjacent two layers of the filler (5), the gas redistribution device adopts a porous plate structure, and the pore diameter is 5mm-15mm.

5. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, The supplementary lye pipeline (7) and the dilution water pipeline (6) are respectively provided with flow monitoring and adjusting devices, which ensure that the potassium hydroxide concentration value in the absorption liquid is 8%-14%.

6. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, The circulating heat exchanger (13) adopts a plate heat exchanger, the inner plate of which adopts a corrugated structure, the corrugated depth is 3mm-8mm, the corrugated spacing is 5mm-12mm, the plate material is stainless steel or titanium alloy, and the sealing between the plates adopts a high-performance rubber gasket.

7. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 2, characterized in that, The air filtering device adopts a multi-stage filtering structure, including primary efficiency filtration, intermediate efficiency filtration and high efficiency filtration, the primary efficiency filtration adopts a non-woven fabric material, the intermediate efficiency filtration adopts a glass fiber filter paper material, and the high efficiency filtration adopts an HEPA filter paper material, and the air filtering device is provided with a differential pressure monitoring device.

8. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, The liquid level in the tail gas absorption tower (1) is higher than the inlet end of the molten salt furnace tail gas pipeline (9).

9. The molten salt furnace tail gas carbon dioxide recovery and utilization device according to claim 1, characterized in that, The tail gas absorption tower (1) is provided with a demister in the upper portion, the demister adopts a wire mesh demisting structure, and the demisting efficiency can ensure that the mist droplet concentration in the outlet smoke is not greater than 75 mg / NM 3 .

10. The molten salt furnace tail gas carbon dioxide recovery device according to any one of claims 1-9, characterized in that, The potassium carbonate finished product tank (3) adopts a sealed and moisture-proof structure, the tank body is provided with a capacity monitoring device, and the top is provided with a safety discharge device.

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