A device for increasing the CO2 concentration in the gas system of a soda ash calcining furnace.

Abstract

The device for improving the CO2 concentration of soda calcining furnace gas system provided by the application is characterized in that when the device is put into operation, the exhaust cavity cover is arranged at the top of the cyclone separator and is communicated with the gas outlet of the cyclone separator, the side wall of the exhaust cavity is provided with an opening, the furnace gas is discharged from the opening of the side wall of the exhaust cavity to the furnace gas pipeline, the outlet of the furnace gas is changed from the top end of the cyclone separator to the side, one end of the furnace gas pipeline is connected with the opening, and the other end of the furnace gas pipeline is connected with the hot lye tower; the spraying device is arranged on the top wall of the furnace gas pipeline and is used for flushing the inner wall of the furnace gas pipeline, so that the spraying and washing effects can be achieved, the spraying liquid can be prevented from entering the cyclone separator, the scabbing problem of the furnace gas system can be solved, the cleaning frequency is reduced from once per shift to once per week, the cleaning frequency is reduced, the frequency and labor intensity of manual cleaning are greatly reduced, a large amount of external air is prevented from being introduced in the cleaning process, and the carbon dioxide concentration in the furnace gas system is improved.

Description

Technical Field

[0001] This application relates to the technical field of soda ash production, and in particular to a device for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace. Background Technology

[0002] Soda ash (sodium carbonate, Na2CO3) is an important basic chemical raw material, widely used in glass, chemical, and metallurgical industries. In the widely used "ammonia-soda process" for soda ash production, the heavy alkali (sodium bicarbonate, NaHCO3) from the filtration process needs to be decomposed by calcination to obtain soda ash product. This process takes place in a steam calciner, where the heavy alkali decomposes upon heating to produce solid soda ash, while simultaneously releasing a mixed gas containing carbon dioxide (CO2), ammonia (NH3), water vapor (H2O), and entrained alkali dust, collectively referred to as "furnace gas." The CO2 concentration in the furnace gas is a core parameter for the subsequent carbonization process (soda ash production reaction). Its concentration and stability directly affect the quality of carbonization crystallization, operational stability, system conversion rate, and the final yield of soda ash, having a decisive impact on improving the efficiency and effectiveness of the entire process.

[0003] In the existing ammonia-soda process for producing soda ash, the equipment used for treating the calcination of heavy soda and purifying the furnace gas mainly includes a steam calciner, a cyclone separator, a furnace gas scrubbing tower, a compressor, and the piping system connecting each piece of equipment.

[0004] However, the cyclone separator in the relevant calcining furnace gas system has a top outlet, and the top outlet bends and pipe turns are prone to scaling due to alkali scale and ammonium bicarbonate crystals, leading to poor gas flow. To maintain production, frequent manual cleaning of the scaled areas is required, which introduces a large amount of external air, causing a decrease in the carbon dioxide concentration in the furnace gas system, which adversely affects compression and heavy alkali crystallization. Utility Model Content

[0005] To address the problems existing in the background technology, this application provides a device for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace. The device includes: a cyclone separator, an exhaust chamber, a furnace gas pipeline, a spray device, and a hot alkali solution tower; the exhaust chamber is shrouded on the top of the cyclone separator and communicates with the outlet of the cyclone separator, with an opening on its side wall; one end of the furnace gas pipeline is connected to the opening, and the other end is connected to the hot alkali solution tower, with furnace gas discharged from the side wall opening of the exhaust chamber into the furnace gas pipeline, thus changing the furnace gas outlet from the top outlet of the cyclone separator to a side outlet; the spray device is located on the top wall of the furnace gas pipeline and is used to rinse the inner wall of the furnace gas pipeline, thereby reducing the cleaning of scale in the furnace gas system from once per shift to once a week, significantly reducing the frequency and labor intensity of manual cleaning, and avoiding the introduction of large amounts of external air during the cleaning process, thereby increasing the carbon dioxide concentration in the furnace gas system.

[0006] The details are as follows:

[0007] This application provides a device for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace. The device includes: a cyclone separator, an exhaust chamber, a furnace gas pipeline, a spray device, and a hot alkali tower.

[0008] The exhaust chamber cover is located on the top of the cyclone separator and is connected to the air outlet of the cyclone separator. The side wall of the exhaust chamber is provided with an opening.

[0009] One end of the furnace gas pipe is connected to the opening, and the other end of the furnace gas pipe is connected to the hot alkali tower. The furnace gas is discharged from the side wall opening of the exhaust chamber into the furnace gas pipe and then flows into the hot alkali tower.

[0010] The spraying device is installed on the top wall of the furnace gas pipeline and is used to rinse the inner wall of the furnace gas pipeline.

[0011] Optionally, the furnace gas pipeline includes a first connecting pipe and an inclined pipe.

[0012] One end of the first connecting pipe is connected to the opening, and the other end of the first connecting pipe is connected to the first end of the inclined pipe;

[0013] The second end of the inclined pipe is connected to the hot alkali tower, and the second end of the inclined pipe is lower than the first end of the inclined pipe. After the furnace gas is discharged from the side wall opening of the exhaust chamber to the first connecting pipe, it flows into the hot alkali tower through the inclined pipe.

[0014] The spraying device is installed on the upper wall of the inclined pipe.

[0015] Optionally, the spraying device includes a spray pipe and a plurality of spray heads;

[0016] Multiple spray heads are spaced apart on the upper wall of the inclined pipe, and the spray pipe is connected to each of the spray heads.

[0017] Optionally, the furnace gas pipeline further includes a liquid seal section, a second connecting pipeline, a valve, and a discharge pipeline.

[0018] One end of the liquid seal is connected to the second end of the inclined pipe, and the other end of the liquid seal is connected to one end of the second connecting pipe;

[0019] The other end of the second connecting pipe is connected to the hot alkali tower;

[0020] The liquid seal section is equipped with the valve. One end of the discharge pipe is connected to the valve, and the other end of the discharge pipe is connected to the concentrated hot alkali pipe of the hot alkali tower, and is used to discharge the liquid in the liquid seal section to the concentrated hot alkali pipe.

[0021] Optionally, the first connecting pipe is in a horizontal or inclined state.

[0022] Optionally, the height of the exhaust chamber is 100~300cm.

[0023] Optionally, an angle β is formed between the first connecting pipe and the inclined pipe, and the angle β is 120~150°.

[0024] Optionally, a through hole is provided above the exhaust chamber, the through hole is connected to the exhaust chamber, and the through hole is provided with a sealing component that can be opened and closed.

[0025] Optionally, the through hole is circular.

[0026] Compared with the prior art, this application has the following advantages:

[0027] This application provides an apparatus for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace. The apparatus includes: a cyclone separator, an exhaust chamber, a furnace gas pipeline, a spray device, and a hot alkali solution tower. The exhaust chamber is shrouded on the top of the cyclone separator and is connected to the outlet of the cyclone separator. An opening is provided on the side wall of the exhaust chamber. One end of the furnace gas pipeline is connected to the opening, and the other end of the furnace gas pipeline is connected to the hot alkali solution tower. The furnace gas is discharged from the opening on the side wall of the exhaust chamber into the furnace gas pipeline and then flows into the hot alkali solution tower. The spray device is provided on the top wall of the furnace gas pipeline and is used to rinse the inner wall of the furnace gas pipeline.

[0028] When the equipment is in operation, the exhaust chamber cover is located on top of the cyclone separator and is connected to the outlet of the cyclone separator. The exhaust chamber cover increases the airflow path in the cyclone separator, improving the dust separation effect. The side wall of the exhaust chamber has an opening, and the furnace gas is discharged from the side wall opening of the exhaust chamber to the furnace gas pipeline, changing the furnace gas outlet from the top outlet of the cyclone separator to the side outlet. One end of the furnace gas pipeline is connected to the opening, and the other end of the furnace gas pipeline is connected to the hot alkali tower. The spray device is set on the top wall of the furnace gas pipeline and is used to wash the inner wall of the furnace gas pipeline. It can achieve the spray washing effect and prevent the spray liquid from entering the cyclone separator. As a result, the cleaning of the furnace gas system is reduced from once per shift to once a week, greatly reducing the frequency and labor intensity of manual cleaning, and avoiding the introduction of a large amount of external air during the cleaning process, which would increase the carbon dioxide concentration in the furnace gas system.

[0029] When the equipment is in standby or maintenance failure state, a liquid seal section is installed at the lowest point of the furnace gas pipeline to form a pipeline liquid seal, which "physically isolates" the maintenance or standby furnace gas system from the operating furnace gas system, cutting off the path of external air into the furnace gas system to the greatest extent and effectively increasing the CO2 concentration in the furnace gas.

[0030] When operation is required or after a malfunction is repaired, the liquid in the liquid seal section is discharged into the hot alkali solution tower, which helps to form a dilute hot alkali solution for effective recycling.

[0031] In summary, the device described in this application can effectively increase the CO2 concentration in the furnace gas, thereby improving the efficiency and effectiveness of the entire process. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 An overall structural diagram of the furnace gas device provided in an embodiment of this application is shown;

[0034] Figure 2 The diagram shows the structure of the furnace gas device provided in the embodiments of this application during maintenance or standby.

[0035] Figure 3 This paper shows a structural diagram of the furnace gas device provided in the embodiment of this application during operation;

[0036] Figure 4This diagram illustrates the structure of another furnace gas device provided in an embodiment of this application during operation.

[0037] Figure label:

[0038] 1-Cyclone separator, 2-Exhaust chamber, 21-Opening, 3-Furnace gas pipe, 31-First connecting pipe, 32-Inclined pipe, 33-Liquid seal, 34-Valve, 35-Discharge pipe, 36-Second connecting pipe, 4-Spraying device, 41-Spray head, 42-Spraying pipe, 5-Hot alkali tower, 51-Concentrated hot alkali pipe, 52-Dilute hot alkali pipe, 6-Through hole, 61-Sealing assembly. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Based on the embodiments of this application, any product that is the same as or similar to this application, derived by anyone under the guidance of this application or by combining features of this application with other prior art, falls within the protection scope of this application. Furthermore, all other embodiments obtained by those skilled in the art without inventive effort are within the protection scope of this application.

[0040] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0041] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0042] The following detailed description of a device for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace, provided in this application, is illustrated by listing specific embodiments.

[0043] In existing ammonia-soda process for soda ash production, the equipment used for handling the calcination of heavy alkali and purifying the furnace gas mainly includes a steam calciner, a cyclone separator, a furnace gas scrubbing tower, a compressor, and a piping system connecting these devices. The steam calciner heats and decomposes the heavy alkali, converting sodium bicarbonate into sodium carbonate and releasing furnace gas. The cyclone separator, connected to the outlet of the steam calciner, separates alkali dust entrained in the furnace gas, reducing the impact of solid impurities on subsequent equipment. The furnace gas scrubbing tower washes the furnace gas after the cyclone separator, removing soluble impurities such as ammonia. The compressor compresses the purified furnace gas, providing a carbon dioxide source that meets the pressure requirements for subsequent carbonization processes. In addition, the system includes pipes, elbows, valves, and other components for regulating the flow of furnace gas, as well as devices for controlling the negative pressure at the furnace head.

[0044] However, existing calcining furnace gas systems face several significant technical challenges in actual operation:

[0045] The contradictions and concentration fluctuations in negative pressure control: Precise control of the furnace head negative pressure is crucial but challenging. Too low a negative pressure (small absolute value) will cause alkali dust, NH3, and CO2 carried by the furnace gas to escape from the seals, resulting in material loss, dust pollution, and a strong ammonia odor, severely polluting the environment. Too high a negative pressure (large absolute value) will easily draw outside air into the system, diluting the furnace gas and causing a significant drop in the critical CO2 concentration. This not only reduces the efficiency of subsequent carbonization reactions, affecting the crystallization and conversion rate of heavy alkali, but also adversely impacts the operating efficiency of the compressor.

[0046] System scaling and operational risks: In the piping system before the furnace gas enters the scrubbing tower (especially the section from the cyclone separator outlet to the scrubbing tower inlet), due to the complex gas composition (containing high concentrations of CO2, NH3, H2O vapor, and alkaline dust), hard "scaling" (or "alkali scaling") composed of alkali (NaHCO3 / Na2CO3) and ammonium bicarbonate (NH4HCO3) crystals easily forms at pipe bends and diameter changes. Severe scaling increases system resistance, obstructs gas flow, and directly leads to an abnormally high compressor inlet vacuum, posing a serious threat to the safe and stable operation of the compressor. The outlet bend at the top of the cyclone separator is the area most severely affected by scaling.

[0047] Scale removal difficulties and secondary pollution issues: Current technologies are limited in addressing scale formation in key areas (such as the top bend of the cyclone separator). To prevent the spray solution used for flushing scale from flowing back into the separator and affecting its separation efficiency, the placement of spray points is strictly limited, resulting in poor flushing effects and difficulty in effectively inhibiting scale growth online. Therefore, current methods mainly rely on periodic manual cleaning. Manual cleaning (such as tapping and poking at scale) inevitably requires briefly opening the system or breaking seals, causing a large amount of external air to be drawn into the pipeline. This not only causes drastic fluctuations in CO2 concentration during and after cleaning, disrupting process stability, but also increases labor intensity and operational risks due to frequent cleaning, affecting production continuity and economic efficiency.

[0048] The furnace gas system flow is as follows: Calcining furnace #1 / #2 / #3 / #4 / #5 → Gas outlet box → Premixer → Cyclone separator → Hot alkali liquid tower → Condensation tower → Scrubber tower → Compressor inlet. The furnace gas branch pipes from each calcining furnace, after exiting the hot alkali liquid tower, converge into a main pipe, then enter the condensation tower and scrubber tower, and finally reach the compressor inlet in the compression process. The compressor inlet pressure requirement is ≥-10 kPa. Analyzing the entire "furnace gas system" equipment and piping, from the hot alkali liquid tower → furnace gas main pipe → condensation tower → scrubber tower → compressor inlet, the equipment and piping are all in a closed state, and outside air will not be drawn in during this section. However, the piping and equipment before the hot alkali liquid tower, due to differences in material inlet and outlet requirements and equipment structure, have multiple "ventilation points" or "openings," which are the main points where outside air is drawn in.

[0049] If all the calcining furnace equipment is operating normally, the "venting openings" or "openings" in the furnace gas system are filled with material, which acts as a barrier between the inside and outside of the system and effectively prevents the intake of external air.

[0050] If one of the calcining furnaces malfunctions and is under maintenance or in standby mode, the lack of material barrier will cause outside air to be drawn into the main gas pipe from the gas branch pipe of that calcining furnace, resulting in a decrease in the CO2 concentration of the furnace gas. To solve this problem, the current conventional design is to have a valve to control each branch pipe before it is connected to the main pipe. However, due to pipe scaling, it is difficult to achieve a sealing effect when the valve is closed.

[0051] As can be seen from the above, the inhalation of external air into the furnace gas system is the direct cause of the low CO2 concentration in the furnace gas. In order to overcome the problem that a large amount of external air is introduced during the cleaning process in related technologies, which causes the carbon dioxide concentration in the furnace gas system to decrease, this application provides a device for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace. Figure 1 An overall structural diagram of the furnace gas device provided in an embodiment of this application is shown; as follows: Figure 1As shown, the above-mentioned device includes: cyclone separator 1, exhaust chamber 2, furnace gas pipeline 3, spray device 4, and hot alkali tower 5;

[0052] The exhaust chamber 2 is covered on the top of the cyclone separator 1 and is connected to the air outlet of the cyclone separator 1. The side wall of the exhaust chamber 2 is provided with an opening 21.

[0053] One end of the furnace gas pipeline 3 is connected to the opening 21, and the other end of the furnace gas pipeline 3 is connected to the hot alkali tower 5. The furnace gas is discharged from the side wall opening 21 of the exhaust chamber 2 into the furnace gas pipeline 3 and then flows into the hot alkali tower 5.

[0054] The spray device 4 is installed on the top wall of the gas pipeline 3 and is used to rinse the inner wall of the gas pipeline 3.

[0055] It should be noted that the exhaust chamber 2 can be a cylindrical exhaust chamber, ensuring that the bottom of the exhaust chamber 2 is compatible with the air outlet at the top of the cyclone separator 1.

[0056] It should also be noted that the side wall of the exhaust chamber 2 is provided with an opening 21. The opening 21 is preferably located in the upper middle part of the exhaust chamber 2. For example, if the height of the exhaust chamber is 100cm, the opening 21 can be located at 50cm to 90cm from the top of the exhaust chamber 21. When the opening 21 is located in the upper middle part, after the furnace gas enters the exhaust chamber 2 from the top of the cyclone separator 1, it will first diffuse upward and then naturally flow towards the opening in the upper middle part, forming a smooth path of "rising - gently turning - flowing out laterally", avoiding the formation of violent vortices at the opening.

[0057] In some embodiments, the bottom of the exhaust chamber 2 is fixedly connected to the top outlet of the cyclone separator 1, and a sealing ring (such as a heat-resistant rubber sealing ring or a metal spiral wound gasket) is provided at the connection. The connection is tightened by bolts to ensure the airtightness of the connection between the exhaust chamber 2 and the cyclone separator 1, meet the negative pressure operation requirements of the system, and prevent air from being sucked in.

[0058] In some embodiments, the bottom of the exhaust chamber 2 is detachably connected to the top outlet of the cyclone separator 1. Specifically, the exhaust chamber 2 and the cyclone separator 1 are connected by a flange, which facilitates regular disassembly and inspection of the inside of the exhaust chamber and the outlet of the cyclone separator to check for scaling, and is especially suitable for maintenance of areas with severe scaling.

[0059] In practical implementation, during the calcination process, to ensure the smooth progress of the heavy alkali decomposition reaction, prevent the leakage of furnace gas and alkali dust that pollutes the environment, and ensure the sealing effect between the furnace head and tail, the "furnace head outlet gas" and the entire "furnace gas system" of the calcining furnace must operate under a specific negative pressure state, typically maintained within the range of -50Pa to -200Pa. This system utilizes the suction force generated by an induced draft fan or compressor to maintain the negative pressure. After the furnace gas is drawn from the calcining furnace head, if... Figure 1As shown, the furnace gas first enters the cyclone separator 1 through the tangential inlet for preliminary alkali dust separation. The heavier alkali dust settles and is discharged from the bottom of the cyclone separator 1. The purified furnace gas flows upward along the central exhaust pipe. The furnace gas then enters the furnace gas pipeline 3 through the side opening 21 of the exhaust chamber 2. The spray device 4 located on the top wall of the furnace gas pipeline 3 washes away the scale adhering to the inner wall of the furnace gas pipeline, ensuring smooth gas discharge and safe and stable operation of the compressor. The furnace gas then flows into the hot alkali liquid tower 5. The furnace gas containing acidic components enters from the bottom (or lower middle part) of the tower and comes into countercurrent contact with the dilute alkali liquid sprayed from the dilute hot alkali liquid pipe 52, forming atomized droplets or liquid film. As the furnace gas flows upward, the acidic components are absorbed by the alkali liquid. The purified furnace gas (containing a small amount of water vapor, unreacted inert gases, etc.) gradually accumulates in the upper space of the tower and is discharged from the exhaust port at the top of the hot alkali liquid tower. It flows into the condenser tower and the washing tower for cooling and washing, and is finally sent to the compression process. After being pressurized, it is used for the carbonization process. During the reaction, the concentration of the dilute hot alkali solution gradually increases, and soluble salts are generated, gradually transforming into concentrated hot alkali solution. The concentrated alkali solution after the reaction falls due to gravity and collects in the collection area at the bottom of the hot alkali solution tower, and is discharged from the concentrated hot alkali solution pipe 51.

[0060] The device provided in this application for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace, when the equipment is in operation, uses an exhaust chamber cover installed on top of a cyclone separator and connected to the outlet of the cyclone separator. The exhaust chamber cover increases the airflow path in the cyclone separator, improving the dust separation effect. The side wall of the exhaust chamber has an opening, through which the furnace gas is discharged into the furnace gas pipeline, changing the furnace gas outlet from the top outlet of the cyclone separator to a side outlet. One end of the furnace gas pipeline is connected to the opening, and the other end is connected to the hot alkali tower. A spray device is installed on the top wall of the furnace gas pipeline and is used to wash the inner wall of the furnace gas pipeline. This achieves the spray washing effect while preventing the spray liquid from entering the cyclone separator. As a result, the cleaning of the furnace gas system is reduced from once per shift to once a week, greatly reducing the frequency and labor intensity of manual cleaning. It also avoids the introduction of a large amount of external air during the cleaning process, thereby increasing the carbon dioxide concentration in the furnace gas system and improving the efficiency and effectiveness of the entire process.

[0061] In some implementations, such as Figure 2 As shown, the furnace gas pipeline 3 includes a first connecting pipeline 31 and an inclined pipeline 32.

[0062] One end of the first connecting pipe 31 is connected to the opening 21, and the other end of the first connecting pipe 31 is connected to the first end of the inclined pipe 32.

[0063] The second end of the inclined pipe 32 is connected to the hot alkali tower 5, and the second end of the inclined pipe 32 is lower than the first end of the inclined pipe 32. After the furnace gas is discharged from the side wall opening 21 of the exhaust chamber 2 to the first connecting pipe 31, it flows into the hot alkali tower 5 through the inclined pipe 32.

[0064] The spray device 4 is installed on the upper wall of the inclined pipe 32.

[0065] It should be noted that the first connecting pipe 31 and the inclined pipe 32 can be integral or tightly connected, and this application embodiment does not limit this.

[0066] It should be noted that the first connecting pipe 31 can be in a horizontal or inclined state.

[0067] It should be noted that the first connecting pipe 31 and the inclined pipe 32 can be made of duplex stainless steel (resistant to corrosion by alkaline dust in the furnace gas), and the inner wall is coated with polytetrafluoroethylene (PTFE) coating (0.2~0.3mm thick) to reduce the adhesion of alkaline dust and NH4HCO3 crystals and reduce scaling.

[0068] In this embodiment, one end of the first connecting pipe 32 is connected to the opening 21, and the other end of the first connecting pipe 31 is connected to the first end of the inclined pipe 32. After the furnace gas is discharged from the side wall opening 21 of the exhaust chamber 2 into the first connecting pipe 31, it flows through the inclined pipe 32 and finally into the hot alkali tower 5. The spray device 4 is set on the upper wall of the inclined pipe 32. Through the angle design of the inclined pipe, the spray washing effect can be achieved during the flushing of the furnace gas pipe, while avoiding the spray liquid from entering the cyclone separator and thus preventing the furnace gas system from scaling. The cleaning is reduced from once per shift to once a week, greatly reducing the frequency and labor intensity of manual cleaning, and avoiding the introduction of a large amount of external air during the cleaning process, thereby increasing the carbon dioxide concentration in the furnace gas system.

[0069] In addition, the second end of the inclined pipe 32 is connected to the hot alkali tower 5, and the second end of the inclined pipe 32 is lower than the first end of the inclined pipe 32. It can achieve "gas-liquid separation and liquid drainage" by gravity drive, reduce the formation of scale and extend the cleaning cycle.

[0070] In some implementations, such as Figure 2 As shown, the spraying device 4 includes a spray pipe 42 and a plurality of spray heads 41;

[0071] Multiple spray heads 41 are spaced apart on the upper wall of the inclined pipe 32, and the spray pipe 42 is connected to each spray head 41.

[0072] It should be noted that the liquid in the spray device can be water.

[0073] It should be noted that multiple spray heads 41 can be embedded in the upper wall of the inclined pipe 32 (i.e., the end faces of multiple spray heads 41 are flush with or slightly recessed from the upper wall of the inclined pipe 32). The embedding is achieved using flanges or snap-fit ​​connections, ensuring that disassembly will not damage the overall sealing of the pipe, thus preventing the introduction of external air during equipment operation / maintenance, which would reduce the CO2 concentration of the system and consequently increase the carbon dioxide concentration in the furnace gas system. Because the furnace gas contains alkaline dust, NH3, CO2, and other components, alkaline scale (such as Na2CO3 and NH4HCO3 crystals) easily forms on the inner wall of the inclined pipe 32. The multiple spray heads 41 embedded in the upper wall of the inclined pipe 32 can utilize the pipe's inclination angle to achieve "top-down" rinsing coverage.

[0074] In this embodiment, the first end of the inclined pipe 32 is connected to the other end of the first connecting pipe 31, that is, the inclined pipe 32 is not directly connected to the opening 21. At the same time, multiple spray heads 41 are distributed at intervals on the upper wall of the inclined pipe 32. Therefore, during the flushing of the furnace gas pipeline, the spray washing effect can be achieved, and the spray liquid can be prevented from entering the cyclone separator, thus avoiding the problem of scale buildup in the furnace gas system. The cleaning is reduced from once per shift to once a week, which greatly reduces the frequency and labor intensity of manual cleaning and avoids the introduction of a large amount of external air during the cleaning process, thereby increasing the carbon dioxide concentration in the furnace gas system.

[0075] It should be noted that the multiple spray heads 41 can be evenly spaced or unevenly spaced, but are preferably evenly spaced.

[0076] In this embodiment, multiple spray heads 41 are spaced apart along the upper wall of the inclined pipe 32. Under the action of gravity and the inclined pipe, the sprayed liquid can cover the top, sides and bottom of the inner wall of the inclined pipe. The liquid sprayed from the upper wall spray head first washes the upper half of the inclined pipe, and the remaining liquid flows down along the inner wall of the inclined pipe, naturally covering the lower half. This maximizes the spraying effect, avoids interference with the flow of furnace gas, and also avoids the problem of scale on the upper wall being unable to be cleaned due to the spray head being too low (below the lower wall).

[0077] In some implementations, such as Figure 2 The diagram shows the structure of the furnace gas device provided in this application during maintenance or standby; the furnace gas pipeline 3 also includes a liquid seal 33, a valve 34, a discharge pipeline 35, and a second connecting pipeline 36.

[0078] One end of the liquid seal 33 is connected to the second end of the inclined pipe 32, and the other end of the liquid seal 33 is connected to one end of the second connecting pipe 36.

[0079] The other end of the second connecting pipe 36 is connected to the hot alkali tower 5.

[0080] The liquid seal section 33 is equipped with a valve 34. One end of the discharge pipe 35 is connected to the valve 34, and the other end of the discharge pipe 35 is connected to the concentrated hot alkali pipe 51 of the hot alkali tower 5, and is used to discharge the liquid in the liquid seal section 33 to the concentrated hot alkali pipe 51.

[0081] It should be noted that the liquid seal part 33 can be one of the following shapes: U-shaped, S-shaped, inverted trapezoidal, or irregular. The liquid in the liquid seal part (such as...) Figure 2 The inverted trapezoid shown can be water or other liquids, such as a neutral salt solution.

[0082] It should be noted that the liquid seal unit 33 can be equipped with a liquid level sensor to monitor the liquid seal level in real time. For example, under normal operating conditions, the liquid level is maintained at 250~300mm (to ensure sealing pressure), and an alarm is automatically triggered when it is below 200mm, thereby ensuring the negative pressure control in the furnace gas system.

[0083] It should also be noted that valve 34 can be a pneumatic ball valve with a valve body made of 316L stainless steel and a sealing surface made of PTFE (polytetrafluoroethylene). The leakage level reaches the bubble-level sealing standard, preventing liquid seal failure due to micro-leakage. Valve 34 can be linked with the liquid level sensor of the liquid seal section 33, facilitating the emptying of the liquid seal section during equipment operation.

[0084] In practical implementation, a liquid seal section 33 is installed at the lowest point of the furnace gas pipeline. When the equipment is in standby or under maintenance, to prevent external air from entering the furnace gas pipeline, the "liquid seal valve (not shown in the figure)" is opened, and liquid flows into the liquid seal section 33, filling it and forming a pipeline liquid seal. This liquid seal isolates the furnace gas pipeline from the entire furnace gas system, effectively isolating the maintenance or standby furnace gas system from the operating system. This minimizes the path for external air to enter the furnace gas system, effectively increasing the CO2 concentration in the furnace gas. When operation is required or maintenance is completed, valve 34 is opened, and the liquid in the liquid seal section 33 is discharged through the discharge pipe 35 to the concentrated hot alkali solution pipe 51, helping to form a dilute hot alkali solution for effective recycling.

[0085] In this embodiment, by setting a liquid seal section 33 in the furnace gas pipeline 3, it is easy to "physically isolate" the furnace gas system under maintenance or in standby from the operating furnace gas system, thereby cutting off the path for external air to enter the furnace gas system to the greatest extent. After long-term operation analysis, comparison and evaluation, the CO2 concentration of the furnace gas has increased by 2-3 percentage points.

[0086] In some implementations, the first connecting pipe 31 is in a horizontal or inclined state.

[0087] It should be noted that, as Figure 1-4 As shown, Figure 1-3 This is a schematic diagram showing the first connecting pipe 31 in a horizontal state. Figure 4 This is a schematic diagram of the first connecting pipe 31 in an inclined state. When the first connecting pipe 31 is in an inclined state, the first connecting pipe 31 is inclined downward along the horizontal direction (along the X-axis), that is, the end of the first connecting pipe 31 connected to the inclined pipe 32 is lower than the end of the first connecting pipe 31 connected to the opening 21.

[0088] In this embodiment, when the first connecting pipe 31 is horizontal, it prioritizes stable airflow and low energy consumption, adapting to clean furnace gas. This is mainly for scenarios where "the furnace gas contains few impurities and the system is sensitive to pressure loss." It is also suitable for scenarios where plant height is limited or equipment layout is compact (such as when the horizontal distance between the exhaust chamber and the inclined pipe is short and the vertical height difference is small). This reduces the number of pipe bends, lowers construction complexity, and reduces leakage risk. When the first connecting pipe 31 is inclined, the slope enhances impurity guidance, adapting to complex furnace gas containing dust and liquid. This is mainly for scenarios where "the furnace gas contains many particles or condensate." Both states can achieve a "seamless connection" between the exhaust chamber 2 and the inclined pipe 32, providing a stable and clean furnace gas flow for subsequent spraying treatment and avoiding blockages, corrosion, or efficiency reduction caused by unreasonable pipe configuration.

[0089] In some embodiments, the height of the exhaust chamber 2 is 100cm to 300cm.

[0090] It should be noted that the height H of the exhaust chamber 2 is 100cm to 300cm. For example, the height of the exhaust chamber 2 is one or any two of the following values: 100cm, 120cm, 150cm, 180cm, 200cm, 230cm, 250cm, 270cm, 290cm, and 300cm. The height of the exhaust chamber provided in this application is adapted to other devices in the embodiments of this application. The height of the exhaust chamber can also be other values ​​in the range of 100cm to 300cm, as long as it is adapted to other operating devices. This application does not make any special limitation here.

[0091] In this embodiment, by controlling the height of the exhaust chamber 2 between 100cm and 300cm, the furnace gas can complete the entire process of "rotational deceleration - radial diffusion - axial smooth turning" within the exhaust chamber 2, avoiding turbulent resistance and preventing particle deposition caused by excessively low flow velocity. Specifically, controlling the height of the exhaust chamber 2 between 100cm and 300cm provides sufficient space for diffusion and turning of the furnace gas, reduces the introduction of impurities downstream through gravity separation, balances system pressure, reduces the risk of scaling, and adapts to maintenance and installation requirements, ultimately ensuring the stable and efficient operation of the entire furnace gas treatment system (cyclone separator → exhaust chamber → furnace gas pipeline → hot alkali tower).

[0092] In some embodiments, an angle β is formed between the first connecting pipe 31 and the inclined pipe 32, and the angle β is 120~150°.

[0093] It should be noted that, as Figure 3 As shown, an angle β is formed between the first connecting pipe 31 and the inclined pipe 32. The angle β is 120~150°. For example, the angle β can be one or any two of 120°, 130°, 135°, 140°, 145°, and 150°.

[0094] In this embodiment, an angle β is formed between the first connecting pipe 31 and the inclined pipe 32. The angle β is controlled between 120° and 150°, which allows the furnace gas flow direction to transition smoothly, reduces local resistance and eddy phenomena, and ensures that the furnace gas enters the inclined pipe 32 in a more stable state, thereby reducing system energy consumption. At the same time, the angle, combined with the "downward" characteristic of the inclined pipe 32 itself (the second end is lower than the first end), can guide impurities or accumulated liquid to flow naturally downstream of the inclined pipe 32 by gravity, reducing the risk of blockage.

[0095] In some embodiments, a through hole 6 is provided above the exhaust chamber 2, the through hole 6 is connected to the exhaust chamber 2, and the through hole 6 is provided with a sealing component 61, which can be opened and closed.

[0096] It should be noted that the through hole 6 can be located at the center of the exhaust chamber 2 or at other locations on the top of the exhaust chamber, as long as the through hole 6 is connected to the exhaust chamber 2, preferably at the center. The through hole 6 can serve as a cleaning hole to remove scale inside the exhaust chamber 2, or it can serve as an observation hole to observe the internal operation of the equipment.

[0097] It should be noted that the top of the exhaust chamber 2 has a through hole, and the edge of the through hole is provided with an outward flange, which works in conjunction with the sealing component 61: a flip-top cover plate and a silicone rubber sealing ring. The sealing ring is embedded in the groove of the cover plate. The cover plate is connected to the flange by a hinge and is equipped with a quick locking mechanism (such as a buckle or a wing bolt) to achieve "absolute sealing during operation and quick opening and closing during cleaning", reducing the air intake time during the cleaning process.

[0098] In practice, the opening procedure is as follows: stop the machine → confirm that the system is pressure-free → unlock the quick-locking mechanism → rotate and lift the cover plate → use the support rod to fix the cover plate in the open state → clean / inspect.

[0099] The closing procedure is as follows: cleaning completed → close the cover plate → lock the quick-locking mechanism → check that there are no foreign objects on the sealing surface → verify the sealing performance (such as pressure holding test) before starting the equipment.

[0100] In this embodiment, a through hole 6 is provided above the exhaust chamber 2. The through hole 6 is connected to the exhaust chamber 2. The through hole 6 is provided with a sealing component 61. The sealing component 61 can be opened and closed, which not only meets the airtightness requirements during equipment operation (preventing furnace gas leakage or air mixing, and ensuring stable furnace gas concentration), but also solves the problem of "time-consuming opening and closing and cumbersome operation" of traditional bolt-connected cover plates (for example, shortening the preparation time before cleaning from 30 minutes to 5 minutes), avoiding the introduction of a large amount of external air during the cleaning process, thereby increasing the carbon dioxide concentration in the furnace gas system.

[0101] In some implementations, the through hole 6 is circular.

[0102] It should be noted that the above-mentioned through hole is circular, which makes it easy for cleaning tools (such as long rods or high-pressure water guns) to reach the lower part of the exhaust chamber (the area where scale easily accumulates) without obstruction or blind spots when inserted from the top.

[0103] It should be noted that the diameter D of the aforementioned through hole 6 is 800mm~1000mm. For example, the diameter of the through hole 6 can be one or any two of the following: 800mm, 820mm, 850mm, 880mm, 900mm, 930mm, 950mm, 980mm, and 1000mm.

[0104] In this embodiment, the through hole is circular. Circular through holes are easier to manufacture and have more uniform stress distribution on the hole wall (no stress concentration points), resulting in better structural stability under long-term high-temperature and vibration conditions. Simultaneously, the circular cover plate is simpler to manufacture and install, and precise alignment with the through hole can be achieved through rotational fine-tuning, further ensuring a good seal.

[0105] The diameter of the circular through hole is 800mm~1000mm. Essentially, it is about finding the optimal balance between "operational convenience, sealing reliability, and equipment strength" to ensure that the through hole can meet the maintenance needs of the exhaust chamber without affecting the safety and stability of the equipment during operation.

[0106] The above-mentioned furnace gas device was applied in a practical project as follows:

[0107] In a domestic soda ash plant's 900,000-ton / year soda ash project, six Ø3200×32000 light ash calcining furnaces were configured. Under full-load normal operating conditions, the design was "five on, one on standby". Problems included low and unstable CO2 concentration in the furnace gas, poor gas discharge due to scaling in the furnace gas pipeline, severe "alkali spillage" at the furnace head and tail, and a poor on-site environment. The furnace gas device proposed in this application, such as adding an exhaust chamber, side openings, and a liquid seal section, achieved good results, improved the on-site production environment, reduced the labor intensity of employees, and increased the CO2 concentration in the furnace gas by 2-3 percentage points.

[0108] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0109] The above provides a detailed description of the device for increasing the CO2 concentration in the furnace gas system of a soda ash calcining furnace. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A device for increasing the CO2 concentration of a soda calciner gas system, characterized in that, The device includes: a cyclone separator, an exhaust chamber, a furnace gas pipeline, a spray device, and a hot alkali tower; The exhaust chamber cover is located on the top of the cyclone separator and is connected to the air outlet of the cyclone separator. The side wall of the exhaust chamber is provided with an opening. One end of the furnace gas pipe is connected to the opening, and the other end of the furnace gas pipe is connected to the hot alkali tower. The furnace gas is discharged from the side wall opening of the exhaust chamber into the furnace gas pipe and then flows into the hot alkali tower. The spraying device is installed on the top wall of the furnace gas pipeline and is used to rinse the inner wall of the furnace gas pipeline.

2. The apparatus of claim 1, wherein, The furnace gas pipeline includes a first connecting pipe and an inclined pipe. One end of the first connecting pipe is connected to the opening, and the other end of the first connecting pipe is connected to the first end of the inclined pipe; The second end of the inclined pipe is connected to the hot alkali solution tower, and the second end of the inclined pipe is lower than the first end of the inclined pipe. After the furnace gas is discharged from the side wall opening of the exhaust chamber to the first connecting pipe, it flows into the hot alkali solution tower through the inclined pipe. The spraying device is installed on the upper wall of the inclined pipe.

3. The apparatus of claim 2, wherein, The spraying device includes a spray pipe and multiple spray heads; Multiple spray heads are spaced apart on the upper wall of the inclined pipe, and the spray pipe is connected to each of the spray heads.

4. The apparatus of claim 2, wherein, The furnace gas pipeline also includes a liquid seal section, a second connecting pipeline, valves, and a discharge pipeline. One end of the liquid seal is connected to the second end of the inclined pipe, and the other end of the liquid seal is connected to one end of the second connecting pipe; The other end of the second connecting pipe is connected to the hot alkali tower; The liquid seal section is equipped with the valve. One end of the discharge pipe is connected to the valve, and the other end of the discharge pipe is connected to the concentrated hot alkali pipe of the hot alkali tower, and is used to discharge the liquid in the liquid seal section to the concentrated hot alkali pipe.

5. The apparatus of claim 2, wherein, The first connecting pipe is in a horizontal or inclined state.

6. The apparatus of claim 1, wherein, The height of the exhaust chamber is 100~300cm.

7. The apparatus of claim 2, wherein, An angle β is formed between the first connecting pipe and the inclined pipe, and the angle β is 120~150°.

8. The apparatus of claim 1, wherein, A through hole is provided above the exhaust chamber, the through hole is connected to the exhaust chamber, and the through hole is provided with a sealing component that can be opened and closed.

9. The apparatus of claim 8, wherein, The through hole is circular.

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