Sodium silicate concentration and evaporation device system and operation method

Abstract

The invention discloses a sodium silicate concentration and evaporation device system and an operation method. The sodium silicate concentration and evaporation device system comprises a feeding module, an evaporation and concentration tower, a circulation module, a finished product collection module and a control module. In a gradient heat exchange mode, fresh steam is subjected to first heat exchange with the heated sodium silicate mother liquor and then is subjected to second heat exchange with the sodium silicate mother liquor before heating, so that the temperature of the sodium silicate liquid entering the evaporation and concentration tower is obviously increased, and evaporation and concentration are performed in a negative pressure vacuum environment, so that a material quickly reaches a boiling point temperature; various technical methods are combined to further reduce the steam consumption and improve the heat utilization efficiency, the special structural design of the evaporation concentration tower is adopted, and meanwhile, the equipment cost is lower and the effect is remarkable in the technical scheme.

Description

Technical Field

[0001] The invention relates to the technical field of sodium silicate production, and in particular to a sodium silicate concentration and evaporation device and an operation method. Background Art

[0002] Sodium silicate is commonly known as water glass. In order to meet the sodium silicate concentration required by users, simple evaporation and concentration equipment is usually used to evaporate and concentrate liquid sodium silicate to make its mass concentration meet the requirements. In order to save equipment costs, the main component of the traditional evaporation and concentration device is a single-effect coil heat exchanger installed in the concentration tank. The heat source is steam, and the steam single-effect heat exchange leads to high steam unit consumption and high production costs. In addition, as the mass concentration of liquid sodium silicate increases after evaporation, its viscosity becomes larger and larger, and the fluidity of the liquid decreases, resulting in unstable concentration of liquid sodium silicate in the concentration tank, and there is a risk of scaling of the heat exchanger and the concentration tank, which further reduces product quality and reduces heat utilization efficiency. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a sodium silicate concentration and evaporation device system and an operating method to improve the heating efficiency of sodium silicate liquid and enhance the product quality of sodium silicate solution.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0005] A sodium silicate concentration and evaporation device system comprises a feed module, an evaporation and concentration tower, a circulation module, a finished product collection module and a control module, wherein the feed module comprises a mother liquid tank, a first pipeline, a gas-liquid heat exchanger and a liquid inlet pump, wherein the mother liquid tank is used to store sodium silicate mother liquid, the mother liquid tank is connected to the gas-liquid heat exchanger through a first pipeline, a liquid inlet pump is arranged on the first pipeline, and the delivery pipeline is connected to the upper end of the gas-liquid heat exchanger; the evaporation and concentration tower is used to evaporate and concentrate the sodium silicate mother liquid, the delivery pipeline communicates the gas-liquid heat exchanger and the evaporation and concentration tower, the evaporation and concentration tower is divided into a gas-liquid mixing zone, a core heating zone and a concentrated liquid collection zone, the gas-liquid mixing zone is located at the upper layer of the evaporation and concentration tower, the core heating zone is located at the middle layer of the evaporation and concentration tower, and the concentrated liquid collection zone is located at the lower layer of the evaporation and concentration tower; the circulation module comprises a second pipeline, a gas-liquid A separator, a circulation pump, a hydrometer, a third pipeline, a first one-way valve, a second one-way valve and an automatic valve, the second pipeline is connected to the gas-liquid separator and the evaporation and concentration tower, the second pipeline is provided with a circulation pump, the second pipeline between the gas-liquid separator and the circulation pump is provided with a hydrometer, the third pipeline is connected to the gas-liquid separator and the mother liquid tank, and the evaporation and concentration tower is connected, the third pipeline connecting the mother liquid tank and the evaporation and concentration tower is provided with a first one-way valve, the third pipeline connecting the evaporation and concentration tower and the gas-liquid separator is provided with a second one-way valve, and the second pipeline between the gas-liquid separator and the hydrometer is provided with an automatic valve; the finished product collection module includes a fourth pipeline and a finished product tank, the fourth pipeline is connected to the gas-liquid separator and the finished product tank; the control module is integrated in the device, and the control module is electrically connected to the liquid inlet pump, the circulation pump, the hydrometer and the automatic valve.

[0006] Furthermore, an exhaust pipe is provided on the top of the mother liquid tank, and the exhaust pipe is connected to a vacuum pump.

[0007] Furthermore, the lower end of the gas-liquid heat exchanger is connected to the first pipeline, and the upper end of the gas-liquid heat exchanger is connected to the second pipeline.

[0008] Furthermore, the gas-liquid mixing zone is provided with a grid plate, and the grid plate has a multi-layer perforated plate structure.

[0009] Furthermore, the core heating zone is provided with a falling film heater, a fifth pipeline and a sixth pipeline. The falling film heater is a shell-and-tube heat exchanger structure. The falling film heater is divided into an inner pipeline and an outer pipeline. The inner pipeline is used for passing steam, and the outer pipeline is used for passing sodium silicate concentrated liquid. The upper end of the inner pipeline is connected to the third pipeline through the fifth pipeline, and the lower end of the inner pipeline is connected to the upper end of the gas-liquid heat exchanger through the sixth pipeline.

[0010] Furthermore, the mother liquid tank and the evaporation concentration tower are provided with liquid level gauges, which are used to detect the liquid level.

[0011] Furthermore, the liquid level gauge of the evaporation concentration tower is electrically connected to the liquid inlet pump through the control module, and the liquid level gauge inside the mother liquid tank is integrated with an automatic high and low level alarm device.

[0012] Furthermore, the hydrometer controls and detects the specific gravity of the sodium silicate liquid through the control module, and the hydrometer is electrically connected to the automatic valve through the control module.

[0013] The present invention also provides an operating method of a sodium silicate concentration and evaporation system, comprising the following steps:

[0014] S1, sending the sodium silicate mother liquor to the gas-liquid heat exchanger through the liquid inlet pump for preheating;

[0015] S2, the heated sodium silicate mother liquor enters from the upper part of the evaporation and concentration tower, enters the core heating zone after being distributed in the gas-liquid mixing zone, and performs heat exchange and evaporation with fresh steam in the core heating zone;

[0016] S3, the water vapor formed after evaporation is discharged from the upper part of the evaporation concentration tower and enters the upper part of the mother liquid tank for gas-liquid separation and waste heat recovery;

[0017] S4, a part of the concentrated sodium silicate liquid is forced to circulate back from the bottom of the evaporation and concentration tower to the upper part of the evaporation and concentration tower through the circulation pump, and a part of it is sent to the gas-liquid separator through the automatic valve for gas-liquid separation after the specific gravity is detected by the hydrometer, and finally enters the finished product tank, and the other part of the concentrated sodium silicate liquid enters the connected upper part of the evaporation and concentration tower to achieve forced circulation reflux.

[0018] Furthermore, the system also includes:

[0019] The core heating zone is provided with a falling film heater, which is a shell-and-tube heat exchanger structure. The falling film heater is divided into an inner pipeline and an outer pipeline. The inner pipeline is used for passing steam, and the outer pipeline is used for passing sodium silicate concentrated liquid.

[0020] a fifth pipeline, the upper end of the inner pipeline is connected to the third pipeline through the fifth pipeline;

[0021] a sixth pipeline, wherein the lower end of the inner pipeline is connected to the upper end of the gas-liquid heat exchanger through the sixth pipeline;

[0022] The method further comprises:

[0023] S21, the fresh steam first enters the falling film heater to perform preliminary heat exchange with the heated sodium silicate mother liquor;

[0024] S22, the steam after the preliminary heat exchange enters the gas-liquid heat exchanger to perform secondary heat exchange with the sodium silicate mother liquor to achieve gradient heat utilization,

[0025] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0026] Different from the prior art, the present invention comprises a feed module, an evaporation and concentration tower, a circulation module, a finished product collection module and a control module. In the present invention, fresh steam performs a first heat exchange with the heated sodium silicate mother liquor, and then performs a second heat exchange with the sodium silicate mother liquor before heating by a gradient heat exchange method, which significantly increases the temperature of the sodium silicate liquid entering the evaporation and concentration tower, and performs evaporation and concentration under a negative pressure vacuum environment, so that the material reaches the boiling point temperature more quickly. The combination of multiple technical methods further reduces steam consumption and improves heat utilization efficiency. The special structural design of the evaporation and concentration tower, including a gas-liquid mixing zone, a core heating zone and a concentrated liquid collection zone, ensures that the sodium silicate liquid is fully and evenly heated and evaporated in the tower, effectively avoiding the problem of unstable concentration. The forced circulation and reflux of the sodium silicate liquid is achieved by a circulation pump, ensuring that the wall of the equipment is not scaled, and improving the service life and stability of the equipment. The water vapor discharged from the bottom of the evaporation and concentration tower and the gas-liquid separator enters the mother liquid tank for interface heat exchange with the sodium silicate mother liquor, recovers waste heat again, and improves energy utilization efficiency. At the same time, the equipment cost of the technical solution is low and the effect is significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of a sodium silicate concentration and evaporation device system provided by the present invention;

[0029] Figure 2 is a schematic diagram of the overall structure of a feed module according to a specific embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the overall structure of the evaporation concentration tower according to a specific embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of the overall structure of an operating method of a sodium silicate concentration and evaporation device system provided by the present invention;

[0032] Figure 5 It is a schematic diagram of the overall structure of the heat exchange evaporation step described in a specific embodiment of the present invention.

[0033] Reference numerals:

[0034] 1. Feed module; 11. Mother liquid tank; 111. Exhaust pipe; 112. Vacuum pump; 12. First pipe; 13. Gas-liquid heat exchanger; 14. Liquid feed pump; 15. Transport pipe; 2. Evaporation concentration tower; 21. Gas-liquid mixing zone; 211. Grid plate; 22. Core heating zone; 221. Falling film heater; 222. Fifth pipe; 223. Sixth pipe; 23. Concentrate collection zone; 3. Circulation module; 31. Second pipe; 32. Gas-liquid separator; 33. Circulation pump; 34. Density meter; 35. Third pipe; 36. First one-way valve; 37. Second one-way valve; 38. Automatic valve; 4. Finished product collection module; 41. Fourth pipe; 42. Finished product tank; 5. Control module; 6. Liquid level meter; 61. High and low level automatic alarm device. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Similarly, the following examples are only partial embodiments of the present invention rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0036] The invention provides a sodium silicate concentration array device system and an operation method, which improve the heating efficiency of high sodium silicate liquid and enhance the product quality of sodium silicate solution.

[0037] See also Figures 1 to 3The present embodiment provides a sodium silicate concentration array device system, including a feed module 1, an evaporation concentration tower 2, a circulation module 3, a finished product collection module 4 and a control module 5. The feed module 1 includes a mother liquid tank 11, a first pipeline 12, a gas-liquid heat exchanger 13 and a liquid inlet pump 14. The mother liquid tank 11 is used to store sodium silicate mother liquid. The mother liquid tank 11 is connected to the gas-liquid heat exchanger 13 through the first pipeline 12. The first pipeline 12 is provided with a liquid inlet pump 14. The delivery pipeline 15 is connected to the gas-liquid heat exchanger 13. The upper end; the evaporation and concentration tower 2 is used to evaporate and concentrate the sodium silicate mother liquor, the delivery pipeline 15 connects the gas-liquid heat exchanger 13 and the evaporation and concentration tower 2, the evaporation and concentration tower 2 is divided into a gas-liquid mixing area 21, a core heating area 22 and a concentrated liquid collection area 23, the gas-liquid mixing area 21 is located in the upper layer of the evaporation and concentration tower 2, the core heating area 22 is located in the middle layer of the evaporation and concentration tower 2, and the concentrated liquid collection area 23 is located in the lower layer of the evaporation tower; the circulation module 3 includes a second pipeline 31, a gas-liquid separator 32, a circulation pump 33, a specific gravity The second pipeline 31 is connected with the gas-liquid separator 32 and the evaporation concentration tower 2, and a circulation pump 33 is arranged on the second pipeline 31. The second pipeline 31 between the gas-liquid separator 32 and the circulation pump 33 is provided with a specific gravity meter 34. The third pipeline 35 is connected with the gas-liquid separator 32 and the mother liquid tank 11 and the evaporation concentration tower 2. The third pipeline 35 connecting the mother liquid tank 11 and the evaporation concentration tower 2 is provided with a first non-return valve 36, a second non-return valve 37 and an automatic valve 38. The second pipeline 31 is connected with the gas-liquid separator 32 and the evaporation concentration tower 2, and a circulation pump 33 is arranged on the second pipeline 31. The second pipeline 31 between the gas-liquid separator 32 and the circulation pump 33 is provided with a specific gravity meter 34. A valve 36 is provided on the third pipeline 35 connecting the evaporation concentration tower 2 and the gas-liquid separator 32, and an automatic valve 38 is provided on the second pipeline 31 between the gas-liquid separator 32 and the hydrometer 34; the finished product collection module 4 includes a fourth pipeline 4132 and a finished product tank 42, and the fourth pipeline 41 connects the gas-liquid separator 32 and the finished product tank 42; the control module is integrated inside the device, and the control module 5 is electrically connected to the liquid inlet pump 14, the circulation pump 33, the hydrometer 34 and the automatic valve 38.

[0038] In this embodiment, through the gradient heat exchange method, the fresh steam performs the first heat exchange with the heated sodium silicate mother liquor, and then performs the second heat exchange with the sodium silicate mother liquor before heating, which significantly increases the temperature of the sodium silicate liquid entering the evaporation and concentration tower 2, and performs evaporation and concentration under a negative pressure vacuum environment, so that the material quickly reaches the boiling point temperature. The combination of multiple technical methods further reduces the steam consumption and improves the heat utilization efficiency. The special structural design of the evaporation and concentration tower 2, including the gas-liquid mixing zone 21, the core heating zone 22 and the concentrated liquid collection zone 23, ensures that the sodium silicate liquid is fully and evenly heated and evaporated in the tower, effectively avoiding the problem of unstable concentration. The circulating pump 33 is used to realize The forced circulation reflux of the sodium silicate liquid is realized, which ensures that the wall of the equipment is not scaled, and improves the service life and stability of the equipment. The water vapor discharged from the evaporation concentration tower 2 and the gas-liquid separator 32 enters the mother liquid tank 11 for interface heat exchange with the sodium silicate mother liquid. The first one-way valve 36 ensures that the water vapor from the evaporation concentration tower flow 2 to the mother liquid tank 11 is a one-way flow, and the second one-way valve 37 ensures that the water vapor from the gas-liquid separator 32 to the evaporation concentration tower 2 is a one-way flow, so as to realize the recovery of waste heat and improve the energy utilization efficiency. The system integrates the control module 5, realizes the automatic interlocking control of the liquid inlet pump 14, the circulation pump 33, the hydrometer 34 and the automatic valve 38, and improves the production efficiency and the convenience of operation.

[0039] In this embodiment, the mother liquid tank 11 is used to store the sodium silicate mother liquid. The mother liquid tank 11 is connected to the gas-liquid heat exchanger 13 through the first pipeline 12. The first pipeline 12 is provided with a liquid inlet pump 14. The delivery pipeline 15 is connected to the upper end of the gas-liquid heat exchanger 13. The liquid inlet pump 14 pumps the sodium silicate mother liquid to the gas-liquid heat exchanger 13 for preheating; the preheated sodium silicate mother liquid enters the gas-liquid mixing zone 21 from the upper part of the evaporation and concentration tower 2, and the grid plate 211 is used to realize the efficient separation of liquid and exhaust steam. Subsequently, the sodium silicate mother liquid enters the core heating zone 22, and performs countercurrent heat exchange with steam to realize efficient evaporation. The evaporated water vapor enters the mother liquid tank 11 from the upper part to enter Gas-liquid separation and waste heat recovery are performed, and the concentrated sodium silicate liquid enters the concentrated liquid collection area 23; a part of the sodium silicate liquid in the concentrated liquid collection area 23 is forced to circulate back to the upper part of the evaporation concentration tower 2 through the circulation pump 33 to ensure that the wall surface of the equipment is not scaled; the other part enters the gas-liquid separator 32 for gas-liquid separation through the interlocking control of the hydrometer 34 and the automatic valve 38 according to the set specific gravity value; the sodium silicate liquid separated by the gas-liquid separator 32 enters the finished product tank 42 through the fourth pipeline 41 for collection; the control module 5 is electrically connected with the liquid inlet pump 14, the circulation pump 33, the hydrometer 34 and the automatic valve 38 to realize automatic interlocking control.

[0040] Furthermore, in this embodiment, an exhaust pipe 111 is provided on the top of the mother liquid tank 11 , and the exhaust pipe is connected to a vacuum pump 112 . The vacuum pump is equipped with a frequency converter to control the vacuum degree, and the frequency converter is automatically adjusted according to the vacuum degree in the mother liquid tank 11 .

[0041] In this embodiment, as the sodium silicate mother liquid is heated and evaporated in the mother liquid tank 11, a certain amount of exhaust steam will be generated. These exhaust steam will be connected to the vacuum pump 112 through the exhaust pipe 111 at the top of the mother liquid tank 11, and pumped and discharged into the atmosphere, so as to ensure the vacuum degree in the tank. When the vacuum degree in the tank decreases, the vacuum pump 112 connected to the exhaust pipe 111 will automatically increase the operating power, increase the vacuum degree, and discharge the exhaust steam in the mother liquid tank in time; when the vacuum degree in the tank increases, the vacuum pump will automatically reduce the operating power and reduce the vacuum degree.

[0042] Furthermore, in some embodiments, the lower end of the gas-liquid heat exchanger 13 is connected to the first pipeline 12 , and the upper end of the gas-liquid heat exchanger 13 is connected to the second pipeline 31 .

[0043] In this embodiment, the lower end of the gas-liquid heat exchanger 13 is connected to the mother liquid tank 11 through the first pipe 12, and the upper end is connected to the evaporation concentration tower 2 and the subsequent circulation module 3 (including the circulation pump 33, the gas-liquid separator 32, etc.) through the second pipe 31. The sodium silicate mother liquor is pumped from the mother liquid tank 11 to the lower end of the gas-liquid heat exchanger 13 by the liquid inlet pump 14, and countercurrent heat exchange is performed with the steam in the heat exchanger. The preheated sodium silicate mother liquor flows out from the upper end of the gas-liquid heat exchanger 13 and enters the evaporation concentration tower 2 through the first pipe 12 for further evaporation and concentration. The sodium silicate mother liquor enters the gas-liquid heat exchanger 13 from the bottom and flows out from the top. The steam in the gas-liquid heat exchanger 13 enters from another pipeline at the top and flows out from the bottom, realizing countercurrent heat exchange, ensuring that the sodium silicate mother liquor can absorb the heat of the steam more efficiently during the preheating process, improving the heat transfer efficiency, helping to reduce steam consumption, and improving the overall heat utilization efficiency.

[0044] In this embodiment, the sodium silicate mother liquid is pumped from the mother liquid tank 11 to the lower end of the gas-liquid heat exchanger 13 by the liquid inlet pump 14, and performs countercurrent heat exchange with steam in the heat exchanger. Steam enters from the upper end of the heat exchanger, and performs heat exchange with the sodium silicate mother liquid entering from the lower end, so that the sodium silicate mother liquid is preheated and the preheated sodium silicate mother liquid flows out from the upper end of the gas-liquid heat exchanger 13, and enters the evaporation and concentration tower 2 through the first pipeline 12 for further evaporation and concentration.

[0045] Furthermore, in some embodiments, the gas-liquid mixing zone 21 is provided with a grid plate 211, and the grid plate 211 has a multi-layer perforated plate structure.

[0046] In this embodiment, a grid plate 211 is provided in the gas-liquid mixing zone 21 of the evaporation concentration tower 2. The grid plate 211 adopts a multi-layer perforated plate structure. This structural design can increase the contact area between the sodium silicate liquid and the water vapor evaporated from the top, and improve the heat exchange efficiency. After the sodium silicate mother liquor is pumped to the gas-liquid heat exchanger 13 by the liquid inlet pump 14 for preheating, it enters the gas-liquid mixing zone 21 from the upper part of the evaporation concentration tower 2. Under the action of the grid plate 211, the sodium silicate liquid fully contacts and heat exchanges with the water vapor evaporated from the top, so that the mother liquor is quickly heated. Subsequently, the sodium silicate liquid enters the core heating zone 22 for further evaporation and concentration.

[0047] In this embodiment, the sodium silicate mother liquor is pumped to the gas-liquid heat exchanger 13 by the liquid inlet pump 14 for preheating, and then enters the gas-liquid mixing zone 21 from the upper part of the evaporation concentration tower 2. In the gas-liquid mixing zone 21, the multi-layer perforated plate structure of the grid plate 211 increases the contact area between the sodium silicate liquid and the water vapor evaporated from the top. The water vapor is evenly dispersed in the sodium silicate liquid through the perforated plate structure of the grid plate 211, and fully exchanges heat with the liquid, so that the mother liquor is quickly heated. Under the action of the grid plate 211, the liquid and the exhaust gas are effectively separated, and the sodium silicate liquid continues to flow downward into the core heating zone 22 for further evaporation and concentration.

[0048] Furthermore, in some embodiments, the core heating zone 22 is provided with a falling film heater 221, a fifth pipe 222 and a sixth pipe 223. The falling film heater 221 is a shell-and-tube heat exchanger structure. The falling film heater 221 is divided into an inner pipe and an outer pipe. The inner pipe is used for passing steam, and the outer pipe is used for passing sodium silicate concentrate. The upper end of the inner pipe is connected to the third pipe 35 through the fifth pipe 222, and the lower end of the inner pipe is connected to the upper end of the gas-liquid heat exchanger 13 through the sixth pipe 223.

[0049] In this embodiment, the falling film heater 221 adopts a shell-and-tube heat exchanger structure, with steam passing through the inner pipeline and sodium silicate concentrated liquid passing through the outer pipeline, so as to realize countercurrent heat exchange between steam and sodium silicate liquid. This design makes the heat exchange between steam and liquid more sufficient and improves the evaporation efficiency. The upper end of the inner pipeline is connected to the third pipeline 35 through the fifth pipeline 222, so that steam can be continuously supplied to the falling film heater 221. At the same time, the upper end of the inner pipeline is connected to the lower end of the gas-liquid heat exchanger 13 through the sixth pipeline 223, and the preheated steam is introduced into the gas-liquid heat exchanger 13 for further heat utilization, thereby optimizing the heat transfer path and improving the heat utilization efficiency. The design of the falling film heater 221 helps to reduce the local overheating of the sodium silicate liquid during the heating process and reduce the risk of scaling, thereby enhancing the stability and service life of the system.

[0050] In this embodiment, a falling film heater 221 is provided in the core heating zone 22 of the evaporation concentration tower 2. The falling film heater 221 adopts a shell-and-tube heat exchanger structure and is divided into an inner pipeline and an outer pipeline. The inner pipeline is used for passing steam, and the outer pipeline is used for passing sodium silicate concentrated liquid. The upper end of the inner pipeline is connected to the third pipeline 35 (the water vapor pipeline discharged from the bottom of the evaporation concentration tower 2) through the fifth pipeline 222, so that steam can be continuously supplied to the falling film heater 221. At the same time, the upper end of the inner pipeline is connected to the lower end of the gas-liquid heat exchanger 13 through the sixth pipeline 223, and the preheated steam is introduced into the gas-liquid heat exchanger 13 for further heat utilization. After the sodium silicate mother liquor is preheated by the gas-liquid heat exchanger 13, it enters the core heating zone 22 from the upper part of the evaporation concentration tower 2, flows through the outer pipeline of the falling film heater 221, and the steam enters the falling film heater 221 from the inner pipeline, and performs countercurrent heat exchange with the sodium silicate concentrated liquid to achieve efficient evaporation.

[0051] In this embodiment, steam enters the evaporation and concentration tower 2 through the third pipe 35, and is connected to the lower end of the inner pipe of the falling film heater 221 through the fifth pipe 222. At the same time, the steam enters the lower end of the gas-liquid heat exchanger 13 through the sixth pipe 223 to preheat the sodium silicate mother liquor. The preheated sodium silicate mother liquor enters the core heating area 22 from the upper part of the evaporation and concentration tower 2, flows through the outer pipe of the falling film heater 221, and the steam enters the falling film heater 221 from the inner pipe to perform countercurrent heat exchange with the sodium silicate concentrate. Since the steam and the liquid flow in opposite directions in the falling film heater 221, the heat exchange is more sufficient, thereby improving the evaporation efficiency.

[0052] Furthermore, in some embodiments, a liquid level meter 6 is provided inside the mother liquid tank 11 and the evaporation concentration tower 2 , and the liquid level meter 6 is used to detect the liquid level.

[0053] In this embodiment, the liquid level meter 6 can monitor the liquid level changes in the mother liquid tank 11 and the evaporation concentration tower 2 in real time, and transmit the data to the control system. The control system automatically adjusts the operating status of the equipment such as the liquid inlet pump 14 and the circulation pump 33 according to the liquid level information, realizes the automatic control of the system, reduces manual intervention, and improves production efficiency. By real-time monitoring of the liquid level, abnormal conditions in the system, such as too high or too low liquid level, can be discovered in time, so that corresponding measures can be taken to adjust, avoid system failure or shutdown due to abnormal liquid level, and enhance the operation stability of the system. According to the liquid level information, the feed amount of the sodium silicate mother liquid and the operating parameters of the evaporation concentration tower 2 can be reasonably adjusted to avoid waste and excessive consumption of resources and achieve optimal allocation of resources.

[0054] In this embodiment, a liquid level meter 6 is installed at an appropriate position of the mother liquid tank 11 to monitor the liquid level changes in the mother liquid tank 11 in real time. At the same time, a liquid level meter 6 is also installed inside the evaporation concentration tower 2 to monitor the liquid level in the tower. The liquid level meter 6 transmits the detected liquid level data to the control system.

[0055] Furthermore, in some embodiments, the liquid inlet pump 14 is electrically connected to the liquid level meter 6 of the evaporation concentration tower 2 through the control module 5 , and the liquid level meter 6 inside the mother liquid tank 11 is integrated with an automatic high and low level alarm device 61 .

[0056] In this embodiment, the liquid inlet pump 14 is electrically connected to the liquid level gauge 6 of the evaporation and concentration tower 2 through the control module 5, thereby realizing precise control of the feed flow rate. Through the change of the liquid level in the evaporation and concentration tower 2, the signal is transmitted to the control module 5, and the control module 5 automatically adjusts the opening of the liquid inlet pump 14 according to the preset value, thereby accurately controlling the liquid inlet amount and ensuring the stability of the liquid level inside the evaporation and concentration tower 2; the liquid level gauge 6 inside the mother liquid tank 11 is integrated with a high and low level automatic alarm function. When the liquid level in the mother liquid tank 11 reaches a preset high or low level, the liquid level gauge 6 automatically sends an alarm signal to remind the operator to take timely measures to avoid safety accidents such as overflow caused by excessively high liquid level or idling of the liquid inlet pump 14 caused by too low liquid level.

[0057] In this embodiment, the liquid level meter 6 of the evaporation concentration tower 2 monitors the liquid level in the tower in real time, and transmits the liquid level signal to the control module 5. The control module 5 processes and analyzes the received liquid level signal, and outputs a control signal to the liquid inlet pump 14 according to the preset liquid level range and control logic. The liquid inlet pump 14 adjusts the opening according to the control signal, thereby accurately controlling the feed amount; the liquid level meter 6 inside the mother liquid tank 11 monitors the liquid level in the tank in real time. When the liquid level reaches a preset high or low level, the liquid level meter 6 automatically sends an alarm signal, and the alarm signal can be transmitted to the control system. The control system takes corresponding measures according to the alarm information, such as adjusting the operating status of the liquid inlet pump 14 or sending an audible and visual alarm to remind the operator. After receiving the alarm signal, the operator promptly checks the liquid level of the mother liquid tank 11 and takes corresponding measures to ensure the safe operation of the system.

[0058] Further, in some embodiments, the hydrometer 34 controls and detects the specific gravity of the sodium silicate liquid through the control module 5 , and the hydrometer 34 is electrically connected to the automatic valve 38 through the control module 5 .

[0059] In this embodiment, the hydrometer 34 monitors the specific gravity of the sodium silicate liquid in real time and transmits the data to the control module 5. The control module 5 automatically adjusts the opening of the automatic valve 38 according to the preset specific gravity range to control the discharge amount of the concentrated liquid. When the specific gravity detected by the hydrometer 34 is lower than the preset lower limit, the control module 5 sends a signal to the automatic valve 38 to reduce the opening, reduce the discharge amount of the concentrated liquid, and continue to concentrate the liquid in the tower. When the specific gravity is higher than the preset upper limit, the control module 5 increases the opening of the automatic valve 38 to increase the discharge amount to prevent the liquid from being over-concentrated. The automatic valve 38 maintains the current opening to maintain a stable state. Further preferably, if the specific gravity continues to be low, the control module 5 can adjust the flow rate of the liquid inlet pump 14 in a linked manner to reduce the feed amount and speed up the concentration speed. If the concentration speed is too slow, the control module 5 can adjust the opening of the steam valve in a linked manner to increase the steam supply and improve the evaporation efficiency.

[0060] See also Figure 4-5 This embodiment provides an operation method of a sodium silicate concentration array device system, comprising the following steps:

[0061] S1, sending the sodium silicate mother liquor to the gas-liquid heat exchanger 13 through the liquid inlet pump 14 for preheating;

[0062] S2, the heated sodium silicate mother liquor enters from the upper part of the evaporation concentration tower 2, enters the falling film heater 221 after being distributed through the grid plate 211, and exchanges heat with the fresh steam in the falling film heater 221 for evaporation;

[0063] S3, the water vapor formed after evaporation is discharged from the upper part of the evaporation concentration tower 2 and enters the upper part of the mother liquid tank 11 for gas-liquid separation and waste heat recovery;

[0064] S4, a part of the concentrated sodium silicate liquid is forced to circulate back from the bottom of the evaporation and concentration tower 2 to the upper part of the evaporation and concentration tower 2 through the circulation pump 33, and a part of it is sent to the gas-liquid separator 32 through the automatic valve 38 for gas-liquid separation after the specific gravity is detected by the hydrometer 34, and finally enters the finished product tank 42, and the other part of the concentrated sodium silicate liquid enters the upper part of the connected evaporation and concentration tower 2 to achieve forced circulation reflux.

[0065] In this embodiment, the operating method achieves efficient, energy-saving and stable production of sodium silicate concentration through preheating, falling film evaporation, waste heat recovery and automatic control.

[0066] Further, in some embodiments, the heat exchange evaporation step includes:

[0067] S21, fresh steam first enters the falling film heater 221 to perform preliminary heat exchange with the heated sodium silicate mother liquor;

[0068] S22, the steam after the preliminary heat exchange enters the gas-liquid heat exchanger 13 to perform secondary heat exchange with the sodium silicate mother liquor to achieve gradient heat utilization.

[0069] In this embodiment, through gradient heat exchange, fresh steam enters the evaporation and concentration tower 2 to perform the first heat exchange with the heated sodium silicate mother liquor, and then enters the gas-liquid heat exchanger 13 to perform the second heat exchange with the sodium silicate mother liquor before heating, thereby increasing the temperature of the sodium silicate liquid entering the evaporation and concentration tower 2, so that it quickly reaches the boiling point temperature.

[0070] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0071] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0072] The above descriptions are only some embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sodium silicate concentration and evaporation device system, characterized in that: include: A feeding module, the feeding module comprising a mother liquid tank, a first pipeline, a gas-liquid heat exchanger, a liquid inlet pump and a delivery pipeline, the mother liquid tank is used to store sodium silicate mother liquid, the mother liquid tank is connected to the gas-liquid heat exchanger through the first pipeline, the first pipeline is provided with a liquid inlet pump, and the delivery pipeline is connected to the upper end of the gas-liquid heat exchanger; An evaporation and concentration tower, wherein the evaporation and concentration tower is used to evaporate and concentrate the sodium silicate mother liquor, wherein the delivery pipeline connects the gas-liquid heat exchanger and the evaporation and concentration tower, wherein the evaporation and concentration tower is divided into a gas-liquid mixing zone, a core heating zone and a concentrated liquid collecting zone, wherein the gas-liquid mixing zone is located at the upper layer of the evaporation and concentration tower, the core heating zone is located at the middle layer of the evaporation and concentration tower, and the concentrated liquid collecting zone is located at the lower layer of the evaporation and concentration tower; A circulation module, the circulation module comprising a second pipeline, a gas-liquid separator, a circulation pump, a hydrometer, a third pipeline, a first one-way valve, a second one-way valve and an automatic valve, the second pipeline communicating with the gas-liquid separator and the evaporation concentration tower, the second pipeline being provided with a circulation pump, the second pipeline between the gas-liquid separator and the circulation pump being provided with a hydrometer, the third pipeline communicating with the gas-liquid separator and the mother liquid tank and the evaporation concentration tower being connected, the third pipeline communicating with the mother liquid tank and the evaporation concentration tower being provided with a first one-way valve, the third pipeline communicating with the evaporation concentration tower and the gas-liquid separator being provided with a second one-way valve, and the second pipeline between the gas-liquid separator and the hydrometer being provided with an automatic valve; A finished product collection module, the finished product collection module comprising a fourth pipeline and a finished product tank, the fourth pipeline communicating with the gas-liquid separator and the finished product tank; A control module is integrated in the device and is electrically connected to the liquid inlet pump, the circulation pump, the hydrometer and the automatic valve.

2. A sodium silicate concentration and evaporation device system as claimed in claim 1, characterized in that: An exhaust pipe is arranged on the top of the mother liquid tank, and the exhaust pipe is connected to a vacuum pump.

3. A sodium silicate concentration and evaporation device system as claimed in claim 1, characterized in that: The lower end of the gas-liquid heat exchanger is connected to the first pipeline, and the upper end of the gas-liquid heat exchanger is connected to the second pipeline.

4. A sodium silicate concentration and evaporation device system as claimed in claim 1, characterized in that: The gas-liquid mixing zone is provided with a grid plate, and the grid plate has a multi-layer perforated plate structure.

5. A sodium silicate concentration and evaporation device system as claimed in claim 1, characterized in that: The core heating zone is provided with a falling film heater, which is a shell-and-tube heat exchanger structure. The falling film heater is divided into an inner pipeline and an outer pipeline. The inner pipeline is used for passing steam, and the outer pipeline is used for passing sodium silicate concentrated liquid. The system further comprises: a fifth pipeline, the upper end of the inner pipeline is connected to the third pipeline through the fifth pipeline; A sixth pipeline, wherein the lower end of the inner pipeline is connected to the upper end of the gas-liquid heat exchanger through the sixth pipeline.

6. A sodium silicate concentration and evaporation device system as claimed in claim 1, characterized in that: The mother liquid tank and the evaporation concentration tower are provided with liquid level gauges, which are used to detect the liquid level.

7. A sodium silicate concentration and evaporation device system as claimed in claim 6, characterized in that: The liquid level gauge of the evaporation concentration tower is electrically connected to the liquid inlet pump through the control module, and the liquid level gauge inside the mother liquid tank is integrated with a high and low level automatic alarm device.

8. A sodium silicate concentration and evaporation device system as claimed in claim 1, characterized in that: The hydrometer controls and detects the specific gravity of the sodium silicate liquid through the control module, and the hydrometer is electrically connected to the automatic valve through the control module.

9. An operating method of a sodium silicate concentration and evaporation system, characterized in that: Applicable to the system according to any one of claims 1 to 8, the method comprising the following steps: S1, sending the sodium silicate mother liquor to the gas-liquid heat exchanger through the liquid inlet pump for preheating; S2, the heated sodium silicate mother liquor enters from the upper part of the evaporation and concentration tower, enters the core heating zone after being distributed in the gas-liquid mixing zone, and performs heat exchange and evaporation with fresh steam in the core heating zone; S3, the water vapor formed after evaporation is discharged from the upper part of the evaporation concentration tower and enters the upper part of the mother liquid tank for gas-liquid separation and waste heat recovery; S4, a part of the concentrated sodium silicate liquid is forced to circulate back from the bottom of the evaporation and concentration tower to the upper part of the evaporation and concentration tower through the circulation pump, and a part of it is sent to the gas-liquid separator through the automatic valve for gas-liquid separation after the specific gravity is detected by the hydrometer, and finally enters the finished product tank, and the other part of the concentrated sodium silicate liquid enters the connected upper part of the evaporation and concentration tower to achieve forced circulation reflux.

10. The method for operating a sodium silicate concentration and evaporation system according to claim 9, characterized in that: The system further comprises: The core heating zone is provided with a falling film heater, which is a shell-and-tube heat exchanger structure. The falling film heater is divided into an inner pipeline and an outer pipeline. The inner pipeline is used for passing steam, and the outer pipeline is used for passing sodium silicate concentrated liquid. a fifth pipeline, the upper end of the inner pipeline is connected to the third pipeline through the fifth pipeline; a sixth pipeline, wherein the lower end of the inner pipeline is connected to the upper end of the gas-liquid heat exchanger through the sixth pipeline; The method further comprises: S21, the fresh steam first enters the falling film heater to perform preliminary heat exchange with the heated sodium silicate mother liquor; S22, the steam after the preliminary heat exchange enters the gas-liquid heat exchanger to perform secondary heat exchange with the sodium silicate mother liquor to achieve gradient heat utilization.

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