Ammonia-soda process sodium carbonate production system

Abstract

The invention relates to the technical field of chemical equipment, and discloses a sodium carbonate production system adopting an ammonia-soda process. The system for producing sodium carbonate by the ammonia-soda process comprises a thin liquid distillation tower and a flash evaporation module. The thin liquid distillation tower is used for discharging waste thin liquid; the flash evaporation module comprises a second flash evaporation device and a water injection assembly; a steam outlet of the second flash tank is communicated with a steam inlet of the thin liquid distillation tower; the water inlet end of the water injection assembly is communicated with the thin liquid distillation tower, and the water outlet end of the water injection assembly is located in the second flash tank and used for discharging waste thin liquid to flush flash steam in the second flash tank. According to the invention, by arranging the water injection assembly, the waste thin liquid discharged from the thin liquid distillation tower is introduced into the second flash tank for flushing flash steam in the second flash tank so as to flush away droplets in the flash steam, and the content of calcium ions introduced into the thin liquid distillation tower can be reduced, so that the calcium ions in the waste thin liquid are reduced and even eliminated; and the waste thin liquid discharged from the thin liquid distillation tower can be used as filtering washing water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical equipment, and particularly relates to an ammonia soda process caustic soda production system. BACKGROUND

[0002] In the ammonia soda process caustic soda production process, ammonia is recovered through a distillation process, which is carried out in a light liquor distillation column. In the current production process, the distillation waste liquid generated by the mother liquor distillation column is first treated by a first flash evaporator, and then enters a second flash evaporator for secondary flash distillation. The temperature of the waste liquid after secondary flash distillation is about 82 DEG C, and the secondary steam generated by flash distillation is supplied to the light liquor distillation column by a steam pump or other conveying means as a heat source for distilling ammonia water (when the amount of secondary steam is insufficient, the system will supplement low-pressure steam). The ammonia gas at the top of the light liquor distillation column is recovered and reenters the production system for recycling, while the waste light liquor discharged from the bottom of the column cannot be used in the production system due to the presence of a certain concentration of calcium ions (usually the concentration of calcium ions is greater than 20 mg / L), and can only be discharged as industrial wastewater, which not only causes waste of water resources, but also increases the cost of wastewater treatment. SUMMARY

[0003] The present application provides an ammonia soda process caustic soda production system to solve the problem of water resource waste and high wastewater treatment cost in the prior art.

[0004] The present application provides an ammonia soda process caustic soda production system, comprising: a light liquor distillation column for discharging waste light liquor; a flash module comprising a second flash evaporator and a water injection assembly; a steam outlet of the second flash evaporator is in communication with a steam inlet of the light liquor distillation column; a water inlet end of the water injection assembly is in communication with the light liquor distillation column, and a water outlet end of the water injection assembly is located in the second flash evaporator for discharging the waste light liquor to flush the flash steam in the second flash evaporator.

[0005] According to the ammonia soda process caustic soda production system provided by the present application, the water injection assembly comprises: a water injection conveying pipe installed in the second flash evaporator; a water inlet end of the water injection conveying pipe is in communication with the light liquor distillation column, and a water outlet end of the water injection conveying pipe is located on a flash steam discharge path in the second flash evaporator.

[0006] According to the ammonia soda process caustic soda production system provided by the present application, the water injection assembly further comprises: a spray head installed at the water outlet end of the water injection conveying pipe for spraying the waste light liquor towards the flash steam of the second flash evaporator.

[0007] According to the ammonia soda process caustic soda production system provided by the present application, the water injection conveying pipe comprises: a main conveying pipe, a water inlet end of the main conveying pipe being communicated with the dilute liquid distillation tower, and a water outlet end of the main conveying pipe being located in the second flasher; a plurality of branch conveying pipes, water inlet ends of the plurality of branch conveying pipes being connected with the water outlet end of the main conveying pipe, the plurality of branch conveying pipes being arranged around the central axis of the second flasher, water outlet ends of the branch conveying pipes extending along the radial direction of the second flasher, and the spray heads being installed on the water outlet ends of the branch conveying pipes, the spray heads spraying the waste dilute liquid towards the bottom of the second flasher.

[0008] According to the soda production system provided by the present application, the flash module further comprises: a defoaming assembly installed in the second flasher, the defoaming assembly being located on the discharge path of the flash steam and being used for removing the flash steam from the flash steam.

[0009] According to the soda production system provided by the present application, the defoaming assembly is a screen.

[0010] According to the soda production system provided by the present application, the water outlet end of the water injection assembly is located above the screen.

[0011] According to the soda production system provided by the present application, the screen has a mesh diameter of not less than 1 mm and not more than 5 mm.

[0012] According to the soda production system provided by the present application, the screen has a mesh diameter of 3 mm.

[0013] According to the soda production system provided by the present application, the flash module further comprises: a first flasher, a liquid inlet of the first flasher being used for being communicated with a liquid outlet of a mother liquid distillation tower, and a liquid outlet of the first flasher being communicated with a liquid inlet of the second flasher.

[0014] The soda production system provided by the present application, by setting the water injection assembly, the waste light liquor discharged from the light liquor distillation tower is introduced into the second flasher for flushing the flash steam in the second flasher, the waste light liquor contacts the flash steam in the second flasher, the waste heat therein can be reused for the flashing process, the overall energy consumption of the system is reduced, the waste light liquor can flush the spatter in the flash steam, the calcium ions in the spatter and the precipitate generated by the reaction are flushed into the waste liquor, the calcium ion content in the flash steam is reduced from both physical and chemical aspects, even the calcium ions in the flash steam are removed, the calcium ion content introduced into the light liquor distillation tower is reduced, the calcium ions in the waste light liquor are reduced or even eliminated, the waste light liquor discharged from the light liquor distillation tower can be used as the filter washing water, the waste light liquor can be recycled in the soda production system, the amount of waste water and the pollutant concentration are reduced, and the environmental protection cost is reduced. In summary, the production system of the present application, by setting the water injection assembly which is in communication with the light liquor distillation tower and the second flasher at the water inlet end and the water outlet end respectively, can solve the problems of water resource waste and high waste water treatment cost in the soda production system of the ammonia soda process in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0016] Figure 1 is a structural schematic diagram of the soda production system of the ammonia soda process provided by the present application; wherein the solid arrow represents the liquid flow direction, and the hollow arrow represents the gas flow direction.

[0017] Figure 2 is a structural schematic diagram of the flashing module in the soda production system of the ammonia soda process provided by the present application; wherein the solid arrow represents the liquid flow direction, and the hollow arrow represents the gas flow direction.

[0018] Reference signs: 100, light liquor distillation tower; 200, flashing module; 210, first flasher; 220, second flasher; 230, water injection assembly; 240, steam delivery pump; 250, defoaming assembly; 221, upper shell; 222, middle shell; 223, lower shell; 231, water injection delivery pipe; 232, spray head; 233, main delivery pipe; 234, branch delivery pipe. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the drawings in the present application. Obviously, the described embodiments are only a part of embodiments of the present application, but not all embodiments of the present application. Based upon the embodiments in the present application, all other embodiments obtained by those ordinarily skilled in the art without creative efforts should fall into the scope of the present application.

[0020] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0022] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0023] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the 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, different embodiments or examples described in the specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0024] In embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The association relationship of the associated objects described by "and / or" indicates that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone.

[0025] The following will be described in combination with Figure 1 and Figure 2 The soda production system provided by the present application is described.

[0026] As shown in Figure 1 and Figure 2 , a soda production system is provided in a specific embodiment of the first aspect of the present application. The soda production system includes a light liquor distillation tower 100 and a flash module 200. The light liquor distillation tower 100 is used to discharge waste light liquor; the flash module 200 includes a second flasher 220 and a water injection assembly 230; the steam outlet of the second flasher 220 is in communication with the steam inlet of the light liquor distillation tower 100; the water inlet end of the water injection assembly 230 is in communication with the light liquor distillation tower 100, and the water outlet end of the water injection assembly 230 is located in the second flasher 220, used to discharge waste light liquor to flush the flash steam in the second flasher 220.

[0027] In this embodiment, by setting up a water injection component 230, the waste distillate discharged from the distillation tower 100 is introduced into the second flash evaporator 220 to flush the flash vapor inside the second flash evaporator 220. The waste distillate comes into contact with the flash vapor inside the second flash evaporator 220, and the residual heat can not only be reused in the flash process, reducing the overall energy consumption of the system, but also the waste distillate can wash away the droplets in the flash vapor, washing the calcium ions and precipitates produced by the reaction into the waste liquid. In this way, the calcium ion content in the flash vapor is reduced, or even removed, from both physical and chemical aspects, reducing the calcium ion content introduced into the distillation tower 100, thereby reducing or even eliminating the calcium ions in the waste distillate. This allows the waste distillate discharged from the distillation tower 100 to be used as filter washing water, enabling the waste distillate to be recycled in the soda ash production system, reducing the amount of wastewater discharged and the concentration of pollutants, and reducing environmental protection costs. In summary, the production system of the present invention, by setting up a water injection component 230 with its inlet and outlet ends connected to the distillation tower 100 and the second flash evaporator 220 respectively, can solve the problems of water waste and high wastewater treatment costs in the existing ammonia-soda process soda ash production system.

[0028] In addition, the water injection component 230 injects waste desalinated liquid as a flushing medium into the second flash evaporator 220, which can also flush out sediment, slow down the scaling rate of the second flash evaporator 220, reduce the maintenance frequency of the second flash evaporator 220, extend the service life of the second flash evaporator 220, and indirectly reduce production costs.

[0029] In this embodiment, the waste distillate discharged from the distillation tower 100 was tested, and the result showed that the calcium ion concentration was less than 5 mg / L. This proves that the method of this embodiment can effectively reduce the calcium ion content in the waste distillate, so that the waste distillate can be used as filter washing water, thereby reducing the amount of demineralized water used in the system.

[0030] In some embodiments, a second flash evaporator 220 has a second flash chamber inside; the top of the tank of the second flash evaporator 220 is provided with a steam outlet, and the tank of the second flash evaporator 220 is also provided with a liquid inlet. The liquid inlet is located below the steam outlet. The tank of the second flash evaporator 220 is also provided with a mounting hole, and the water injection assembly 230 is installed in the mounting hole. Distillation waste liquid enters the second flash chamber through the liquid inlet, flashes in the second flash chamber, and the generated steam is discharged from the steam outlet and enters the distillation tower 100. The waste liquid discharged from the drain outlet of the second flash chamber can be discharged to the slag discharge area.

[0031] like Figure 1 As shown, optionally, the flash evaporation module 200 also includes a steam transfer pump 240; the steam outlet of the second flash evaporator 220 is connected to the distillation column 100 via the steam transfer pump 240; the steam transfer pump 240 is used to transfer the flash steam discharged from the second flash evaporator 220 to the distillation column 100.

[0032] Optionally, the volume of the waste liquid stored in the second flash chamber is 30%-50% of the second flash chamber.

[0033] Optionally, the height of the waste liquid stored in the second flash chamber is less than 1 / 3 of the total height of the second flash chamber.

[0034] Optionally, the steam outlet pressure of the steam outlet of the second flasher 220 is -0.050 MPa.

[0035] As shown in Figure 2 Optionally, the second flasher 220 includes an upper shell 221, a middle shell 222, and a lower shell 223. The upper shell 221, the middle shell 222, and the lower shell 223 are spliced in the up-down direction to form a tank body of the second flasher 220 with a second flash chamber. The longitudinal section of the upper shell 221 is triangular, the longitudinal section of the lower shell 223 is triangular, and the longitudinal section of the middle shell 222 is rectangular; the cross section of the upper shell 221, the lower shell 223, and the middle shell 222 are all circular or quadrilateral. The lower shell 223 is provided with a liquid inlet and a liquid outlet, and the upper shell 221 is provided with a steam outlet.

[0036] Preferably, the cross section of the upper shell 221, the lower shell 223, and the middle shell 222 are all circular. The height of the lower shell 223 is 2700 mm, the height of the middle shell 222 is 4400 mm, and the height of the upper shell 221 is 1100 mm. The diameter of the middle shell 222 is 5000 mm.

[0037] Optionally, the second flasher 220 is designed with a manhole for easy maintenance and replacement of the screen.

[0038] In some embodiments of the present application, the water injection assembly 230 includes a water injection delivery pipe 231; the water injection delivery pipe 231 is installed on the second flasher 220; the water inlet end of the water injection delivery pipe 231 is in communication with the light liquid distillation column 100, and the water outlet end of the water injection delivery pipe 231 is located on the flash steam discharge path in the second flasher 220.

[0039] In the present embodiment, the water outlet end of the water injection delivery pipe 231 is directly aligned with the flash steam discharge path, and the waste light liquid and the flash steam are forced to collide, achieving efficient mass and heat transfer, increasing the contact area of the waste light liquid and the flash steam, and increasing the removal speed of the flash steam mist, thereby increasing the removal speed of the calcium ions in the flash steam. The water injection delivery pipe 231 can be selected as a standardized pipe assembly, which can be directly integrated into the existing flasher, with low modification cost.

[0040] Optionally, the water injection pipe 231 is installed in the installation hole of the second flasher 220, and the water outlet end of the water injection pipe 231 is located in the second flash chamber; the water inlet end of the water injection pipe 231 is located outside the second flash chamber and is in communication with the light liquid distillation tower 100. The water injection pipe 231 is convenient to install and disassemble.

[0041] Optionally, the water injection pipe 231 comprises a main pipe 233 and a plurality of branch pipes 234; the main pipe 233 is installed in the installation hole of the second flasher 220; the water inlet end of the main pipe 233 is in communication with the light liquid distillation tower 100, and the water outlet end of the main pipe 233 is located in the second flasher 220; the water inlet end of each of the plurality of branch pipes 234 is connected with the water outlet end of the main pipe 233, and the water outlet end of the branch pipe 234 extends in a direction intersecting the conveying direction of the main pipe 233. In this embodiment, the waste light liquid can be dispersedly conveyed to different positions in the second flasher 220 through the branch structure, the branch pipe 234 and the main pipe 233 form an included angle in the flow direction, three-dimensional flushing of the steam is realized, the steam and the waste light liquid can be fully contacted, the heat exchange efficiency is improved, and the removal speed of calcium ions in the steam is improved. By adjusting the extension direction of the branch pipe 234, the branch pipe 234 can be used to spray the waste light liquid to the area prone to scaling, the scaling speed is further slowed down, the frequency of shutdown cleaning is reduced, and the service life of the equipment is prolonged.

[0042] Optionally, the water injection pipe 231 further comprises a connecting cylinder; the connecting cylinder is installed at the water outlet end of the main pipe 233; the central axis of the connecting cylinder is parallel to the central axis of the second flasher 220, and the plurality of branch pipes 234 are arranged on the side surface of the connecting cylinder around the central axis of the connecting cylinder. The connecting cylinder is used to synchronously introduce the waste light liquid into the plurality of branch pipes 234.

[0043] Optionally, the water injection assembly 230 further comprises a spray head 232; the spray head 232 is installed at the water outlet end of the water injection pipe 231 and is used to spray the waste light liquid to the flash steam of the second flasher 220. The spray head 232 atomizes the waste light liquid into fine droplets, greatly increases the contact area of the liquid and the flash steam, not only improves the heat exchange efficiency, but also improves the removal speed of calcium ions.

[0044] The water injection assembly 230 includes a main delivery pipe 233, a plurality of branch delivery pipes 234, and a plurality of spray heads 232. The main delivery pipe 233 is installed in a mounting hole of the second flasher 220. The mounting hole is formed in the upper shell 221. The water inlet end of the main delivery pipe 233 is connected to the light-liquid distillation tower 100. The water outlet end of the main delivery pipe 233 extends into the second flasher 220 along the radial direction of the second flasher 220 and faces the bottom of the second flasher 220. The water inlet ends of the plurality of branch delivery pipes 234 are connected to the water outlet end of the main delivery pipe 233. The plurality of branch delivery pipes 234 are arranged around the central axis of the second flasher 220. The water outlet ends of the branch delivery pipes 234 extend along the radial direction of the second flasher 220 and are provided with the spray heads 232. The spray heads 232 spray the waste light-liquid towards the bottom of the second flasher 220.

[0045] In some embodiments of the present application, the flash module 200 further includes a defoaming assembly 250. The defoaming assembly 250 is installed in the second flasher 220. The defoaming assembly 250 is located on the discharge path of the flash steam and is used to remove the foam contained in the flash steam.

[0046] In the present embodiment, the defoaming assembly 250 is arranged on the discharge path of the flash steam in the second flasher 220. The foam contained in the flash steam can be removed. The speed of removing the calcium ions in the flash steam is further improved. The dryness of the discharged flash steam is improved.

[0047] Optionally, the defoaming assembly 250 can be a wire mesh defoamer or a screen.

[0048] Illustratively, the screen is installed in the second flash chamber of the second flasher 220 and is used to divide the second flash chamber into an upper flash chamber and a lower flash chamber. The water outlet end of the water injection assembly 230 is located in the upper flash chamber. The distance between the screen and the bottom of the second flash chamber is the installation height of the screen. The installation height is not less than 2 / 3 of the total height of the second flash chamber, so as to ensure the flash space of the waste liquid.

[0049] Optionally, the water outlet end of the water injection assembly 230 is located above the screen. In this way, the water injection assembly 230 can also realize the flushing of the screen, so as to reduce the frequency of cleaning the screen.

[0050] Optionally, the mesh diameter of the screen is not less than 1 mm and not more than 5 mm. If the mesh diameter is too small, the screen is easy to be blocked, which increases the steam discharge resistance. If the mesh diameter is too large, the defoaming effect is affected.

[0051] Preferably, the mesh diameter of the screen is 3 mm. In this way, the steam discharge resistance and the defoaming effect can be balanced.

[0052] In some embodiments of the present application, the flash module 200 further comprises a first flasher 210; the liquid inlet of the first flasher 210 is connected with the liquid outlet of the mother liquor distillation tower, and the liquid outlet of the first flasher 210 is connected with the liquid inlet of the second flasher 220.

[0053] In this embodiment, the distillation waste liquid discharged from the mother liquor distillation tower is first introduced into the first flasher 210 for flashing, the first flash waste liquid discharged from the first flasher 210 is introduced into the second flasher 220, the second flash waste liquid discharged from the second flasher 220 is discharged to the slag field, and the flash steam is introduced into the light liquor distillation tower 100 through the steam delivery pump 240; the waste light liquor discharged from the light liquor distillation tower 100 can not only flow into the second flasher 220 through the water injection assembly 230 to flush the flash steam, but also can be used as filter washing water, thereby saving the amount of desalting water used in the production system.

[0054] Embodiment 1 This embodiment provides an ammonia-soda process caustic soda production system. The ammonia-soda process caustic soda production system comprises a first flasher 210, a second flasher 220, a steam delivery pump 240 and a light liquor distillation tower 100; the liquid inlet of the first flasher 210 is connected with the liquid outlet of the mother liquor distillation tower, the liquid outlet of the first flasher 210 is connected with the liquid inlet of the second flasher 220, and the steam outlet of the second flasher 220 is connected with the steam inlet of the light liquor distillation tower 100 through the steam delivery pump 240. A screen is installed in the second flasher 220, the aperture of the screen is 3 mm, and the screen divides the second flash chamber into an upper flash chamber and a lower flash chamber; the first flash waste liquid is introduced into the lower flash chamber, and the steam outlet of the second flasher 220 is located at the top end of the upper flash chamber. A water injection assembly 230 is further installed on the second flasher 220; the main delivery pipe 233 of the water injection assembly 230 is installed in the installation hole of the second flasher 220, the water inlet end of the main delivery pipe 233 is connected with the liquid outlet of the light liquor distillation tower 100, the water outlet end of the main delivery pipe 233 extends into the upper flash chamber along the radial direction of the second flasher 220, and the water outlet end is connected with the spray head 232 through a plurality of branch delivery pipes 234; the spray head 232 is located above the screen and is used for spraying the waste light liquor discharged from the light liquor distillation tower 100 to the screen. In this way, the double effects of the screen and the spray head 232 spraying the waste light liquor to the flash steam can reduce or even remove the fly ash in the flash steam, thereby reducing the calcium ion content in the waste light liquor. It is found through detection that the calcium ion content in the waste light liquor is less than 5 mg / L.

[0055] In addition, taking an ammonia-soda process caustic soda production system with an annual output of 500,000 tons as an example, the production flow rate of the second flash waste liquid is 600 m 3 / h, the flow rate of the flash steam recovered from the second flasher is 7000 kg / h, and the production amount of the waste light liquor is 64 m 3 / h, of which 6 m 3 / h can be used as the flushing water of the second flasher, and 58 m3 / h system heat exchange to 40℃ after doing filter wash water, save desalination water 58m 3 / h.

[0056] Comparative Example The difference between the present comparative example and Example 1 is that the ammonia-soda process soda production system of the present comparative example does not contain a screen and a water injection assembly. In other words, the ammonia-soda process soda production system of the present comparative example comprises a first flasher, a second flasher, a steam delivery pump and a light liquor distillation column; the liquid inlet of the first flasher is used to communicate with the liquid outlet of the mother liquor distillation column, the liquid outlet of the first flasher communicates with the liquid inlet of the second flasher, and the steam outlet of the second flasher communicates with the steam inlet of the light liquor distillation column through the steam delivery pump. By detecting the waste light liquor discharged from the light liquor distillation column, it is found that the calcium ion content contained therein is greater than 20 mg / L.

[0057] From the data of Example 1 and the comparative example, it can be seen that the ammonia-soda process soda production system provided by Example 1 can significantly reduce the calcium ion content in the waste light liquor, so that the waste light liquor can be used as filter wash water, thereby saving a large amount of desalination water and reducing the cost of wastewater treatment.

[0058] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A soda ash production system using the ammonia-soda process, characterized in that, include: A distillation tower (100) is used to discharge waste distillate; The flash evaporation module (200) includes a second flash evaporator (220) and a water injection assembly (230); the steam outlet of the second flash evaporator (220) is connected to the steam inlet of the distillation column (100); the water inlet of the water injection assembly (230) is connected to the distillation column (100), and the water outlet of the water injection assembly (230) is located inside the second flash evaporator (220) for discharging the waste distillate to flush the flash steam inside the second flash evaporator (220).

2. The ammonia-soda process soda ash production system according to claim 1, characterized in that, The water injection assembly (230) includes: Water injection pipe (231) is installed in the second flash evaporator (220); the inlet end of the water injection pipe (231) is connected to the distillation column (100), and the outlet end of the water injection pipe (231) is located on the flash steam discharge path in the second flash evaporator (220).

3. The ammonia-soda process soda ash production system according to claim 2, characterized in that, The water injection assembly (230) also includes: The nozzle (232) is installed at the outlet end of the water supply pipe (231) and is used to spray the waste desalinated liquid into the flash steam in the second flash generator (220).

4. The ammonia-soda process soda ash production system according to claim 3, characterized in that, The water injection pipe (231) includes: The main delivery pipe (233) has its inlet end connected to the distillation column (100) and its outlet end located inside the second flash evaporator (220). Multiple branch pipes (234) are provided, with their inlet ends connected to the outlet end of the main pipe (233). The multiple branch pipes (234) are arranged around the central axis of the second flash generator (220). The outlet end of each branch pipe (234) extends radially along the second flash generator (220) and is equipped with a nozzle (232). The nozzle (232) sprays the waste desalinated liquid toward the bottom of the second flash generator (220).

5. The ammonia-soda process soda ash production system according to claim 1, characterized in that, The flash module (200) also includes: A defoaming assembly (250) is installed inside the second flash evaporator (220); the defoaming assembly (250) is located on the discharge path of the flash steam and is used to remove droplets from the flash steam.

6. The ammonia-soda process soda ash production system according to claim 5, characterized in that, The demister assembly (250) is a screen.

7. The ammonia-soda process soda ash production system according to claim 6, characterized in that, The water outlet of the water injection assembly (230) is located above the screen.

8. The ammonia-soda process soda ash production system according to claim 6, characterized in that, The mesh diameter of the screen is not less than 1 mm and not more than 5 mm.

9. The ammonia-soda process soda ash production system according to claim 8, characterized in that, The mesh diameter of the sieve is 3 mm.

10. The ammonia-soda process soda ash production system according to any one of claims 1 to 9, characterized in that, The flash module (200) also includes: The first flash evaporator (210) has its inlet connected to the outlet of the mother liquor distillation column, and its outlet is connected to the inlet of the second flash evaporator (220).

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