Recycling and reusing system for steam formed by sodium sulfate treatment process in spinning coagulating bath

Abstract

The utility model discloses a system for recycling steam formed by a sodium sulfate treatment process in a spinning coagulating bath, and belongs to the technical field of reasonable energy utilization in a spinning production line. Through specific arrangement of a mirabilite melting barrel, an evaporator, a heater, a centrifugal machine, a steam-water mixer and the like and specific arrangement of all pipelines, sodium sulfate is effectively recycled, the utilization rate of raw materials is increased, and environmental pressure is reduced; and steam formed by removing combined water in the mirabilite is effectively utilized, so that the energy consumption in the spinning process is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of recycling system of steam, specifically to a kind of recycling system of steam formed by sodium sulfate processing technology in spinning coagulation bath, belong to the rational use of energy technical field in textile production line. BACKGROUND

[0002] In the spinning process, a large amount of Na2SO4 will be produced, and the main reaction equation is as follows:

[0003] C6H9O4OCS2Na+H2SO4→C6H 10 O5+NaHSO4+CS2↑,

[0004] NaHSO4+NaOH →Na2SO4+H2O,

[0005] 2NaOH+H2SO4→Na2SO4+2H2O;

[0006] In wet spinning, the spinning solution stream pressed out from the spinneret coagulates and generates fibers through chemical reaction, and the fibers are coagulated in an aqueous solution of sulfuric acid and sodium sulfate, etc. Sodium sulfate plays a coagulation role, and sulfuric acid plays a chemical reaction role. Therefore, the concentration of sodium sulfate is closely related to the coagulation quality and efficiency. However, in the spinning process, the increasing content of sodium sulfate in the coagulation bath cannot meet the requirements of the process. If only the consumed raw materials in the coagulation bath are added to supplement the concentration, the total amount of the coagulation bath will increase and cannot be stored. The coagulation bath can only be discharged at regular intervals and in a certain amount. The acid, salt, and metal ions in the coagulation bath will cause serious environmental pollution, bring great pressure to wastewater treatment, and cause great waste of resources.

[0007] To ensure the stability of the Na2SO4 content in the coagulation bath, it is necessary to reduce the content of Na2SO4 in the coagulation bath. Currently, a low-temperature crystallization precipitation method is generally used, that is, Na4SO・10H2O is first separated by a centrifugal machine, and then heated by calcination to lose combined water, thereby obtaining Na2SO4 particles. Finally, the particles are dried and packaged to stabilize the Na2SO4 content in the acid bath. In the calcination heating process, the temperature of the steam used by the calcination heater is about 275℃, and the temperature of the secondary steam evaporated is about 100-105℃. Given the high temperature of the secondary steam, in order to save energy, the calcination secondary steam pipe is connected to the multi-effect pre-heater. However, the temperature and pressure of the calcination secondary steam are relatively low compared to the steam required by the multi-effect pre-heater, which results in poor use effect of the multi-effect pre-heater.

[0008] The prior art CN209128047U discloses a "mirabilite heat recovery and utilization system", which mainly solves the problem of site limitation in mirabilite recovery. Although the recovery of the secondary steam of the evaporator is carried out, the efficient utilization of the secondary steam is not solved.

[0009] Therefore, how to efficiently utilize the calcination secondary steam is an urgent problem to be solved. Practical new type content

[0010] In order to improve the effective utilization rate of the calcination secondary steam, a recovery and utilization system of the steam formed by the sodium sulfate treatment process in the spinning coagulation bath is provided. Through the specific arrangement of the mirabilite melting barrel, the evaporator, the heater, the centrifuge and the steam-water mixer, not only the sodium sulfate is effectively recovered, the utilization rate of the raw material is improved, and the environmental pressure is reduced, but also the steam formed by removing the water in the mirabilite is effectively utilized, which effectively reduces the energy consumption in the spinning process.

[0011] In order to achieve the above technical purpose, the following technical scheme is provided:

[0012] A recovery and utilization system of the steam formed by the sodium sulfate treatment process in the spinning coagulation bath, comprising a mirabilite melting barrel and an evaporator connected in sequence, characterized in that: the recovery and utilization system further comprises a steam-water mixer;

[0013] The mirabilite melting barrel is connected with a mirabilite liquid inlet pipe, a water inlet pipe I and an alkali inlet pipe, and the outlet of the mirabilite melting barrel is connected with the inlet of the evaporator through a salt slurry outlet pipe;

[0014] The evaporator is connected with the upper reflux port through a circulating pipe at the bottom outlet, and the circulating pipe is provided with a heater; the top of the evaporator is connected with the steam-water mixer through a secondary steam outlet pipe I; the upper overflow port of the evaporator is connected with the mirabilite melting barrel through a salt slurry overflow pipe; the mirabilite melting barrel, the salt slurry outlet pipe, the evaporator and the salt slurry overflow pipe form a continuous path for mirabilite melting;

[0015] The steam-water mixer is connected with a water inlet pipe II, and the water inlet pipe II is provided with a water amount adjusting valve; the steam-water mixer is connected with a spinning and refining machine through a recovery pipe;

[0016] The heater, the evaporator, the secondary steam outlet pipe I, the steam-water mixer, the recovery pipe and the spinning and refining machine form a continuous path for the generation, condensation and recycling of the secondary steam;

[0017] Further, the mirabilite melting barrel is further connected with a centrifuge through a discharge pipe, and the outlet of the centrifuge is connected with the mirabilite melting barrel through a dilute liquid pipe; at least two salt slurry pumps I are arranged in parallel on the discharge pipe.

[0018] Further, at least two salt slurry pumps II are arranged on the salt slurry outlet pipe, and the salt slurry pumps II are arranged in parallel. This arrangement effectively improves the heating efficiency.

[0019] Further, a circulating pump is arranged on the circulating pipe, and the circulating pump is arranged on the front side of the evaporator station; and the circulating pipe is at least two.

[0020] Further, the secondary steam outlet pipe I extends to the lower part of the steam-water mixer.

[0021] Further, a steam regulating valve I is arranged on the secondary steam outlet pipe I, a pressure sensor is arranged on the evaporator, and the steam regulating valve I and the pressure sensor form a chain signal.

[0022] Further, a temperature sensor is arranged on the recovery pipe, and the temperature sensor, the water inlet amount regulating valve and the steam regulating valve I form a chain signal.

[0023] Further, the steam-water mixer is provided with a blowdown port, a sight glass port and a plurality of liquid outlet ports, the liquid outlet ports are connected with the recovery pipe, the water inlet pipe II extends into the steam-water mixer, and a spiral nozzle is arranged on the water inlet pipe II close to the steam-water mixer. Preferably, the spiral nozzle is a G1 / 2 spiral nozzle. The contact between the sprayed water and the hot gas is increased, and the utilization of the secondary steam is effectively improved. The water flow formed by the spiral nozzle increases the contact area between the water and the secondary steam, cools and heats the secondary steam, and heats itself. Preferably, the liquid outlet ports are three, which are arranged on the upper part, the middle part and the lower part of the steam-water mixer, and corresponding liquid outlet valves are arranged to control the liquid height in the steam-water mixer, so as to realize the pressure balance control in the evaporator.

[0024] Further, the top of the evaporator is connected with the multiple-effect heater through a secondary steam outlet pipe II, a steam regulating valve II is arranged on the secondary steam outlet pipe II, and the steam regulating valve II and the pressure sensor form a chain signal. When the multiple-effect system is in low load operation, the secondary steam is transported to the multiple-effect system for heat recovery.

[0025] In the technical solution, the position relationships such as “upper part”, “upper”, “top”, “between”, “lower part”, “front side of the station” and the like are defined according to the actual use state, are common terms in the technical field, and are common terms used by persons skilled in the art in the actual use process.

[0026] In the description of the technical solution, it should be explained that, unless otherwise specified and limited, the terms "set", "provided with", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the technical solution can be understood according to the specific circumstances.

[0027] By adopting the technical solution, the beneficial technical effects are as follows:

[0028] The utility model discloses a specific setting of mirabilite melting barrel, evaporator, heater and steam-water mixer can be better matched in the sodium sulfate treatment process in the spinning coagulation bath, not only effectively recycles sodium sulfate, improves the utilization rate of raw materials and reduces environmental pressure, but also effectively utilizes the steam formed by removing the combined water in mirabilite (recycled to the spinning and refining machine process), which effectively reduces the energy consumption in the spinning process.

[0029] In addition, through the specific arrangement of pipelines, pumps, valves, flow meters and sensors, the orderliness, controllability and sustainability of the sodium sulfate recovery and secondary steam recycling process are ensured, meeting the industrial requirements. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The utility model relates to the equipment layout of the utility model;

[0031] Figure 2 The steam-water mixer structure in the utility model;

[0032] In the drawing, 1 is mirabilite melting barrel, 2 is evaporator, 3 is steam-water mixer, 4 is mirabilite liquid inlet pipe, 5 is water inlet pipe I, 6 is alkali inlet pipe, 7 is salt slurry pump I, 8 is salt slurry outlet pipe, 9 is salt slurry overflow pipe, 10 is dilute liquid pipe, 11 is discharge pipe, 12 is salt slurry pump II, 13 is heater, 14 is circulating pump, 15 is circulating pipe, 16 is pressure sensor, 17 is steam regulating valve I, 18 is secondary steam outlet pipe I, 19 is steam regulating valve II, 20 is secondary steam outlet pipe II, 21 is nozzle, 22 is water inlet pipe II, 23 is water amount regulating valve, 24 is exhaust pipe, 25 is temperature sensor, 26 is recovery pipe, 27 is blowdown, 28 is sight glass, 29 is liquid outlet, 30 is centrifugal machine. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0034] In the roasting heating process of Glauber's salt, the steam temperature used in the roasting heater is approximately 275℃, while the temperature of the evaporated secondary steam is approximately 100-105℃. Given the relatively high temperature of the secondary steam, to save energy, the roasting secondary steam is often piped to a multi-effect preheater. However, the temperature and pressure of the roasting secondary steam are lower than those required by the multi-effect preheater, resulting in poor performance of the multi-effect preheater.

[0035] Therefore, considering the specific conditions of the spinning production line—namely, the low temperature of the multi-effect condenser in the acid station used for the spinning reaction (typically around 50°C for the condensate from the multi-effect evaporation), while the required condensate temperature at the spinning and refining mill is 50-60°C—a steam-water mixer is employed to exchange heat between pressurized water and the secondary steam from the roasting process. This allows the condensed secondary steam, along with the multi-effect condensate, to be supplied to the spinning process, thereby improving the overall energy efficiency of the production system.

[0036] This will be illustrated with the following example.

[0037] Example 1

[0038] A system for recovering and reusing steam generated from a sodium sulfate treatment process in a spinning coagulation bath, such as... Figure 1 As shown, it includes a Glauber's salt melting tank 1, an evaporator 2, and a steam-water mixer 3 connected in sequence;

[0039] Glauber's salt melting tank 1: Connected to Glauber's salt solution inlet pipe 4, water inlet pipe I 5, and alkali inlet pipe 6. The outlet of Glauber's salt melting tank 1 is connected to the inlet of evaporator 2 via salt slurry outlet pipe 8. Glauber's salt melting tank 1 mainly functions to dissolve, buffer, and stir, initially dissolving the bound water contained in Glauber's salt through stirring.

[0040] Evaporator 2: The bottom outlet is connected to the upper return outlet via a circulation pipe 15, and a heater 13 is installed on the circulation pipe 15. The top of evaporator 2 is connected to the steam-water mixer 3 via a secondary steam outlet pipe I 18. The upper overflow outlet of evaporator 2 is connected to the sodium sulfate melting tank 1 via a salt slurry overflow pipe 9. A continuous path for sodium sulfate melting is formed between the sodium sulfate melting tank 1, the salt slurry outlet pipe 8, the evaporator 2, and the salt slurry overflow pipe 9. Evaporator 2 mainly serves as a buffer and mixer, and is used for recirculation evaporation with the sodium sulfate melting tank 1 and the heater 13. The heater 13 heats the sodium sulfate and evaporates the water in the sodium sulfate decahydrate, ensuring the stability of the total solution volume and the balance of the solid-liquid ratio in the sodium sulfate treatment process.

[0041] Steam-water mixer 3: connected with water inlet pipe II 22, water inlet pipe II 22 is provided with water quantity adjusting valve 23; steam-water mixer 3 is connected with the spinning refining machine through recovery pipe 26. Steam-water mixer 3 recycles heat energy by using the heat exchange principle between steam and water;

[0042] The continuous passage of secondary steam generation, condensed water generation and recycling is formed between the heater 13, the evaporator 2, the secondary steam outlet pipe I 18, the steam-water mixer 3, the recovery pipe 26 and the spinning refining machine.

[0043] Among them, the working process includes:

[0044] I. The coagulation bath with high mirabilite content discharged from the acid bath tank is first separated by a centrifuge, and then the concentrated liquid with high mirabilite content (mirabilite liquid) obtained is introduced into the mirabilite melting barrel 1;

[0045] II. In the mirabilite melting barrel 1, alkali and hot water (such as 50℃) are added, after reaching a certain liquid level, the concentrated liquid is introduced, the concentrated liquid is stirred, preliminarily dissolved, and the alkali is introduced to adjust the pH, and other impurities in the concentrated liquid are dissolved and introduced into the evaporator 2;

[0046] III. In the evaporator 2, the circulating treatment is carried out, that is, under the action of the heater 13 (the steam temperature is about 275℃), heating and overflow into the mirabilite melting barrel 1 to remove the combined water in sodium sulfate decahydrate to obtain sodium sulfate and water vapor (temperature about 100-105℃); the sodium sulfate is post-treated (another centrifuge 30 separates, dries, and packs), and the water vapor (temperature about 100-105℃) is introduced into the steam-water mixer 3;

[0047] IV. In the steam-water mixer 3, pressurized condensed water (such as about 50℃, which is derived from other sections of the spinning production line) is introduced into it, the condensed water and the water vapor (temperature about 100-105℃) are in contact to balance the heat energy, and the condensed water with a temperature of about 55-60℃ is obtained, which is directly recycled to the spinning refining machine on the spinning production line, and the condensed water temperature required at the refining machine is 50-60℃.

[0048] Example 2

[0049] On the basis of example 1, in order to better recycle sodium sulfate and improve the mirabilite melting efficiency, the following is further limited:

[0050] The mirabilite melting barrel 1 is also connected with the centrifuge 30 through the discharge pipe 11, and the light liquid outlet of the centrifuge 30 is connected with the mirabilite melting barrel 1 through the light liquid pipe 10; at least two salt slurry pumps I 7 are arranged on the discharge pipe 11, and the salt slurry pumps I 7 are arranged in parallel. The arrangement effectively improves the post-processing efficiency of the sodium sulfate solution in the mirabilite melting barrel 1, wherein the salt slurry pump I 7 delivers the sodium sulfate solution in the mirabilite melting barrel 1 to the centrifuge 30.

[0051] Example 3

[0052] On the basis of examples 1-2, in order to ensure the stability and controllability of the material conveying process, the present embodiment is further limited as follows:

[0053] At least two salt slurry pumps II 12 are arranged on the salt slurry outlet pipe 8, and the salt slurry pumps II 12 are arranged in parallel. The arrangement effectively improves the heating efficiency, wherein the salt slurry pump II 12 delivers the mirabilite solution in the mirabilite melting barrel 1 to the evaporator 2.

[0054] The circulation pipe 15 is at least two, which effectively improves the heating efficiency. The circulation pump 14 is arranged on the circulation pipe 15 and is arranged on the front side of the evaporator 2. The circulation pump 14 delivers the solution in the crystallization evaporator 2 to the heater 13 for heating, realizing the internal circulation of the mirabilite solution.

[0055] In addition, according to actual needs, temperature sensors 25, pressure sensors 16 and the like are installed at the heater 13 and related equipment to monitor the temperature, steam pressure and flow rate of the inlet and outlet materials and other key parameters in real time. Changes in these parameters can reflect the evaporation capacity, providing a basis for control.

[0056] In addition, the solid-liquid ratio is detected regularly: the solid-liquid ratio in the mirabilite solution is determined regularly by sampling detection and the like. According to the change of the solid-liquid ratio, the evaporation capacity of the heater 13 and the amount of separated sodium sulfate of the centrifuge 30 are adjusted to ensure that they are always within a reasonable range.

[0057] Example 4

[0058] On the basis of examples 1-3, the present embodiment further limits the secondary steam outlet pipe I 18 to further illustrate the technical solution.

[0059] The secondary steam outlet pipe I 18 extends to the lower part of the steam-water mixer 3, and the liquid height in the steam-water mixer 3 is controlled by the three different height outlet valves arranged, thereby realizing the pressure balance control in the evaporator 2.

[0060] Secondary steam out pipe I 18 is provided with steam regulating valve I 17, and evaporator 2 is provided with pressure sensor 16, and steam regulating valve I 17 and pressure sensor 16 form interlocking signals. Further adjust the steam pressure in evaporator 2 to avoid the pressure in evaporator 2 being too high to affect the evaporation of crystalline water.

[0061] Example 5

[0062] On the basis of examples 1-4, this embodiment further limits evaporator 2 to further illustrate the technical solution.

[0063] Evaporator 2 is also connected to multi-effect heater 13 through secondary steam out pipe II 20, and secondary steam out pipe II 20 is provided with steam regulating valve II 19, and steam regulating valve II 19 and pressure sensor 16 form interlocking signals. When the multi-effect system is running at low load, the secondary steam is transported to the multi-effect system for heat energy recycling.

[0064] Heater 13 heats the mirabilite solution, which is evaporated in evaporator 2 (during the heating process, water molecules are evaporated into water vapor by heat, and are discharged from the top of evaporator 2). During the operation of evaporator 2, the mirabilite solution is evaporated by heat, and a large amount of water vapor is discharged from the top; when the evaporation amount of water vapor is large, the excess heat energy can be recycled by being discharged to steam-water mixer 3. Steam-water mixer 3 can mix the high-temperature steam from evaporator 2 with water, so that the water absorbs the heat of the steam, realizing the recycling of heat energy. In this way, the waste of energy can be avoided, and the energy utilization efficiency of the entire spinning system can be improved.

[0065] In addition, the installation position and operation of steam-water mixer 3 need to be reasonably set according to the working condition of evaporator 2. For example, the steam flow, temperature and pressure generated by evaporator 2 need to be considered to ensure that steam-water mixer 3 can effectively receive and process these steam, so the interaction between the two needs to be considered comprehensively to optimize the design and collaborative control.

[0066] Example 6

[0067] On the basis of examples 1-5, this embodiment further limits evaporator 3 to further illustrate the technical solution.

[0068] As Figure 2As shown, the steam-water mixer 3 is provided with a blowdown port 27, a sight glass port 28 and a plurality of liquid outlet ports 29, the liquid outlet ports 29 being connected with the recovery pipe 26; the water inlet pipe II 22 extends into the steam-water mixer 3, and a plurality of nozzles 21 are distributed on the section of the water inlet pipe II 22 close to the steam-water mixer 3. Preferably, the nozzles 21 are G1 / 2 spiral nozzles. Increasing the contact between the sprayed water and the hot gas can effectively improve the utilization of the secondary steam, wherein the water flow formed by the spiral nozzles increases the contact area between the water and the secondary steam, cools and cools the secondary steam, and itself is heated up. Preferably, the liquid outlet ports 29 are three, which are respectively distributed on the upper part, the middle part and the lower part of the steam-water mixer 3, and corresponding liquid outlet valves are arranged to control the liquid level in the steam-water mixer 3, so as to realize the pressure balance control in the evaporator 2 and the like.

[0069] In addition, the recovery pipe 26 is provided with a temperature sensor 25, and the temperature sensor 25 forms a chain signal with the water inlet amount adjusting valve 23 and the steam adjusting valve I 17.

[0070] The steam-water mixer 3 is a device for realizing energy recycling. When the secondary steam from the evaporator 2 enters the steam-water mixer 3, it is mixed with water under a certain pressure; the water absorbs the heat of the secondary steam in the steam-water mixer 3, so that the secondary steam is condensed into liquid water, and the temperature of the water is increased. On the one hand, in this way, the heat in the secondary steam with relatively high temperature but low pressure is transferred to the water, realizing the recycling of the heat energy in the secondary steam and avoiding the waste of energy; on the other hand, the heated water can be transported to a specific process according to actual needs, and is supplied to the spinning and refining machine for use, so as to improve the energy utilization efficiency of the whole production system.

Claims

1. A recycling system of steam formed by sodium sulfate treatment process in a spinning coagulation bath, comprising a mirabilite melting barrel (1) and an evaporator (2) connected in sequence, characterized in that: The recycling system further comprises a steam-water mixer (3); The mirabilite melting barrel (1) is connected with a mirabilite liquid inlet pipe (4), a water inlet pipe I (5) and an alkali inlet pipe (6), and the outlet of the mirabilite melting barrel (1) is connected with the inlet of the evaporator (2) through a salt slurry outlet pipe (8). The bottom outlet of the evaporator (2) is connected with the upper reflux port through a circulating pipe (15), and the circulating pipe (15) is provided with a heater (13); the top of the evaporator (2) is connected with the steam-water mixer (3) through a secondary steam outlet pipe I (18); the upper overflow port of the evaporator (2) is connected with the mirabilite melting barrel (1) through a salt slurry overflow pipe (9); and a continuous path for melting mirabilite is formed among the mirabilite melting barrel (1), the salt slurry outlet pipe (8), the evaporator (2) and the salt slurry overflow pipe (9). The steam-water mixer (3) is connected with a water inlet pipe II (22), and the steam-water mixer (3) is connected with the spinning and scouring refiner through a recycling pipe (26). A continuous path for generating, condensing and recycling secondary steam is formed among the heater (13), the evaporator (2), the secondary steam outlet pipe I (18), the steam-water mixer (3), the recycling pipe (26) and the spinning and scouring refiner.

2. The recovery and reuse system of the vapors formed in the process of treatment of sodium sulfate in the spin bath according to claim 1, characterized in that: The mirabilite melting barrel (1) is further connected with a centrifuge (30) through a discharge pipe (11), and the outlet of the centrifuge (30) is connected with the mirabilite melting barrel (1) through a dilute liquid pipe (10); at least two salt slurry pumps I (7) are arranged on the discharge pipe (11) in parallel.

3. The system for recovery and reuse of vapors formed from the process of treating sodium sulfate in a spin bath according to claim 1, characterized in that: At least two salt slurry pumps II (12) are arranged on the salt slurry outlet pipe (8) in parallel.

4. The system for recovery and reuse of vapors formed from the process of treating sodium sulfate in a spin bath according to claim 1, characterized in that: A circulating pump (14) is arranged on the circulating pipe (15) and located at the front side of the evaporator (2); and the circulating pipe (15) is at least two.

5. The system for recovery and reuse of vapors formed from the process of treating sodium sulfate in a spin bath according to claim 1, characterized in that: The secondary steam outlet pipe I (18) extends to the lower part of the steam-water mixer (3).

6. The recovery and reuse system of the vapors formed in the process of treatment of sodium sulfate in the spin bath according to claim 1 or 5, characterized in that: A steam regulating valve I (17) is arranged on the secondary steam outlet pipe I (18), a pressure sensor (16) is arranged on the evaporator (2), and the steam regulating valve I (17) and the pressure sensor (16) form a chain signal.

7. The recovery and reuse system of the vapors formed in the process of treatment of sodium sulphate in the spin bath according to claim 6, characterized by the fact that it comprises: A temperature sensor (25) is arranged on the recycling pipe (26), a water amount regulating valve (23) is arranged on the water inlet pipe II (22), and the temperature sensor (25), the water amount regulating valve (23) and the steam regulating valve I (17) form a chain signal.

8. The recovery and reuse system of the vapors formed in the process of treatment of sodium sulphate in the spin bath according to claim 1 or 7, characterized by the fact that it comprises: A plurality of liquid outlets (29) are arranged on the steam-water mixer (3), the liquid outlets (29) are connected with the recycling pipe (26), the water inlet pipe II (22) extends into the steam-water mixer (3), and a plurality of nozzles (21) are arranged on the water inlet pipe II (22) near the steam-water mixer (3).

9. The recovery and reuse system of the vapors formed in the process of treatment of sodium sulphate in the spin bath according to claim 8, characterized in that: The nozzles (21) are G1 / 2 spiral nozzles.

10. The recovery and reuse system of the vapors formed in the process of treatment of sodium sulfate in the spin bath according to claim 7, characterized in that: The top of the evaporator (2) is further connected with a multi-effect heater through a secondary steam outlet pipe II (20), a steam regulating valve II (19) is arranged on the secondary steam outlet pipe II (20), and the steam regulating valve II (19) and the pressure sensor (16) form a chain signal.

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