Two-stage evaporation and concentration device for sodium hydrosulfide-containing solution

Abstract

The utility model discloses a two-stage evaporation and concentration device for a sodium hydrosulfide-containing solution, which comprises an intermediate tank provided with a buffer inlet, a buffer outlet, a heat preservation steam inlet and a heat preservation liquid outlet; the two evaporation and concentration assemblies are respectively arranged on the feeding side and the discharging side of the intermediate tank, and each evaporation and concentration assembly comprises a feeding pump; the heating concentration unit comprises a heater, a separator and a circulating pump; a discharge pump; a live steam treatment unit; and a secondary steam treatment unit. According to the two-stage evaporation and concentration device for the sodium hydrosulfide-containing solution, the two evaporation and concentration assemblies are adopted for sequentially carrying out evaporation and concentration, the separation effect is improved, the operation conditions can be flexibly adjusted to meet the requirements of products with different concentrations, the equipment load can be shared together, the service life is prolonged, the maintenance cost is reduced, and equipment operation is more stable and reliable; the requirement of the device on the corrosion resistance of materials is reduced, and the intermediate tank avoids the situation that the fluidity is reduced due to material cooling through heat preservation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of evaporation concentration, especially to a two-stage evaporation concentration device for sodium hydrosulfide solution. BACKGROUND

[0002] The forced circulation evaporator is an evaporator that uses an external power (circulating pump) to force the solution to circulate in a certain direction through the heating pipe. During the circulation process, the solution is heated and evaporated in the heating pipe, then flashed in the separator, the steam is discharged from the upper part, the fluid is blocked and falls down, and is sucked into the circulating pump again through the conical bottom to continue the circulation. The forced circulation evaporator has the advantages of large heat transfer coefficient, salt precipitation resistance, scale resistance, strong adaptability, easy cleaning, etc., and is widely used in chemical industry, pharmaceutical industry, food industry, environmental protection industry, etc.

[0003] However, the existing evaporation concentration device is mostly a single-stage evaporator, which has limited separation effect and bears the working load alone, resulting in limited service life. During the evaporation process, it is not convenient to adjust the operating conditions, and it is difficult to concentrate and evaporate materials of different concentrations, which reduces the concentration effect. For sodium hydrosulfide solution and other corrosive solutions, the evaporation concentration device usually requires pipes, separators and evaporators made of high corrosion-resistant materials, which increases the corrosion resistance requirement of the device to the equipment, thereby increasing the cost of the equipment. In addition, evaporation is carried out at high temperature, which increases the corrosion of sodium hydrosulfide solution, further shortens the service life of the equipment, and the temperature of the corrosive material decreases during pipeline transportation, which reduces the flowability and causes crystalline substances to adhere to the pipe wall, reducing the separation efficiency of sodium hydrosulfide solution. After long-term use, the amount of adhering impurities increases, further causing poor material flow and significantly reducing the separation efficiency.

[0004] Therefore, it is necessary to improve the evaporation concentration device in the prior art. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the defects in the prior art, and provides a two-stage evaporation concentration device for sodium hydrosulfide solution, which improves the concentration efficiency, optimizes the energy utilization, improves the separation effect, meets the process requirements, enhances the stability, reduces the equipment load, prolongs the service life, and reduces the equipment requirements.

[0006] To achieve the above technical effects, the technical scheme of the utility model is as follows: a two-stage evaporation concentration device for sodium hydrosulfide solution, comprising:

[0007] The inner cavity of the intermediate tank includes a buffer cavity and a heat preservation cavity separated by a partition, the intermediate tank is provided with a buffer inlet, a buffer outlet, a heat preservation steam inlet and a heat preservation liquid outlet, the buffer inlet and the buffer outlet are in communication with the buffer cavity, and the heat preservation steam inlet and the heat preservation liquid outlet are in communication with the heat preservation cavity.

[0008] two evaporation concentration assemblies, each of which is arranged at the feeding side and the discharging side of the intermediate tank and comprises:

[0009] a feeding pump;

[0010] a heating concentration unit, which comprises a heater, a separator and a circulating pump, the heater has a live steam inlet and a hot water outlet, the heater is provided with a heating pipe extending into the separator, the separator has a circulating outlet, a concentrated liquid outlet and a secondary steam outlet, the circulating outlet is communicated with the circulating pump and the one end of the heating pipe away from the separator, the output end of the feeding pump is communicated with the input end of the circulating pump;

[0011] a discharging pump, the input end of which is communicated with the concentrated liquid outlet;

[0012] a live steam treatment unit, which is used for discharging the hot water discharged from the hot water outlet out of the system;

[0013] a secondary steam treatment unit, which is used for condensing the secondary steam discharged from the secondary steam outlet into condensed water and then discharging the condensed water out of the system;

[0014] the buffer inlet is communicated with the output end of the discharging pump in the evaporation concentration assembly at the feeding side, and the buffer outlet is communicated with the input end of the feeding pump in the evaporation concentration assembly at the discharging side.

[0015] Preferably, in order to increase the flowability of the material liquid and prevent the material liquid in the heat preservation cavity from caking, a stirring device is connected to the intermediate tank, which comprises a stirring piece moving in the buffer cavity and a driving source driving the stirring piece to move.

[0016] Preferably, in order to treat the live steam entering the heater, the live steam treatment unit comprises a hot water tank and a hot water pump, the hot water outlet is communicated with the hot water tank, the input end of the hot water pump is communicated with the hot water tank, and the output end of the hot water pump is communicated with the outside.

[0017] Preferably, in order to facilitate the collection of the hot water discharged from the intermediate tank, the heat preservation liquid outlet is communicated with the hot water tank in the evaporation concentration assembly at the discharging side.

[0018] Preferably, in order to save energy, a preheating unit is further arranged between the output end of the feeding pump and the heating concentration unit in the evaporation concentration assembly at the feeding side, which is used for guiding the hot water discharged from the hot water pump to preheat the material output by the feeding pump.

[0019] Preferably, in order to realize the preheating of the feed liquid into the separator in the feed side evaporation assembly, the preheating unit comprises a preheater, the preheater has a preheating inlet, a preheating outlet, a hot water inlet and a hot water outlet, the preheating inlet, the preheating outlet, the hot water inlet and the hot water outlet are communicated with the output end of the feed pump, the input end of the circulating pump, the output end of the hot water pump and the outside respectively.

[0020] Preferably, in order to ensure the uniformity of the preheating, the preheater is provided with at least two and is arranged in parallel.

[0021] Preferably, in order to facilitate the continuous operation of the device, the feed pump is provided with two feed pipes and the two feed pipes are provided with feed valves respectively, one of the two feed pipes is communicated with the input end of the circulating pump and the other is communicated with the preheating inlet.

[0022] Preferably, in order to realize the treatment of the secondary steam discharged from the separator, the secondary steam treatment unit comprises a condenser, a tail condenser, a condensate tank, a condensate pump and a vacuum pump, the condenser has a first cooling water inlet, a first cooling water outlet, a secondary steam inlet, a condensate outlet and a first non-condensable gas outlet, the tail condenser is provided with a second cooling water inlet, a second cooling water outlet, a condensate inlet, a second non-condensable gas inlet, a condensate discharge port and a second non-condensable gas outlet, the first cooling water inlet and the second cooling water inlet are used for the inlet of cooling water, the first cooling water outlet and the second cooling water outlet are used for the outlet of cooling water, the condensate outlet is communicated with the condensate inlet, the condensate discharge port is communicated with the condensate tank, the condensate tank is communicated with the outside through the condensate pump, and the first non-condensable gas outlet and the second non-condensable gas outlet are communicated with the outside through the vacuum pump.

[0023] Preferably, in order to realize the flushing cleaning of the pipeline, ensure that the feed liquid can pass through the pipeline smoothly for evaporation concentration, the output end of the condensate pump is connected with a flushing pipe, the flushing pipe is provided with a flushing valve, and the flushing pipe is communicated with the separator, the input end of the circulating pump, the input end of the discharge pump and the output end of the discharge pump.

[0024] Compared with the prior art, the two-stage evaporation concentration device for the sodium sulfide solution has the advantages that two evaporation concentration assemblies are adopted to realize evaporation concentration in sequence, the separation effect is improved, the operation conditions can be adjusted flexibly to adapt to the product requirements of different concentrations, the equipment load can be shared together, the service life is prolonged, the maintenance cost is reduced, the device operation is more stable and reliable, the evaporation temperature is reduced, the corrosion resistance requirement of the device to the material is reduced, and the intermediate tank avoids the decrease of the flowability caused by the temperature drop of the material through heat preservation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of the utility model;

[0026] Figure 2 is a structural schematic view of the intermediate tank in the utility model;

[0027] Figure 3 is a structural schematic view of the feed side evaporation and concentration assembly in the utility model;

[0028] Figure 4 is Figure 3 a partial structural schematic view of the device for processing material in the utility model;

[0029] Figure 5 is Figure 3 a partial structural schematic view of the device for processing secondary steam in the utility model;

[0030] Figure 6 is Figure 3 a partial structural schematic view of the device for processing non-condensable gas in the utility model;

[0031] Figure 7 is a structural schematic view of the discharge side evaporation and concentration assembly in the utility model;

[0032] In the figure: 1, intermediate tank; 101, buffer cavity; 102, heat preservation cavity; 103, buffer inlet; 104, buffer outlet; 105, heat preservation steam inlet; 106, heat preservation liquid outlet; 2, feed pump; 201, feed pipe; 202, feed valve; 3, heater; 301, live steam inlet; 302, hot water outlet; 4, separator; 401, circulation outlet; 402, concentrated liquid outlet; 403, secondary steam outlet; 404, reflux port; 5, discharge pump; 6, stirring device; 601, driving source; 602, stirring piece; 7, hot water tank; 8, hot water pump; 9, preheater; 901, preheating inlet; 902, preheating outlet; 903, hot water inlet; 904, hot water outlet; 10, condenser; 1001, first cooling water inlet; 1002, first cooling water outlet; 1003, secondary steam inlet; 1004, condensate outlet; 1005, first non-condensable gas outlet; 1006, condensate communication port; 11, tail cooler; 1101, second cooling water inlet; 1102, second cooling water outlet; 1103, second non-condensable gas inlet; 1104, condensate discharge port; 1105, second non-condensable gas outlet; 1106, condensate inlet; 12, condensate tank; 13, condensate pump; 1301, flushing pipe; 14, vacuum pump; 15, foam catcher; 1501, separation inlet; 1502, exhaust port; 1503, liquid discharge port; 16, circulation pump. DETAILED DESCRIPTION

[0033] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical scheme of the present application, and cannot be used to limit the protection scope of the present application.

[0034] As shown in Figures 1-7 The two-stage evaporation concentration device for the sodium sulfide solution, comprising:

[0035] The inner cavity of the intermediate tank 1 includes a buffer cavity 101 and a heat preservation cavity 102, and the intermediate tank 1 is provided with a buffer inlet 103, a buffer outlet 104, a heat preservation steam inlet 105 and a heat preservation liquid outlet 106, the buffer inlet 103 and the buffer outlet 104 are both communicated with the buffer cavity 101, and the heat preservation steam inlet 105 and the heat preservation liquid outlet 106 are both communicated with the heat preservation cavity 102;

[0036] Two evaporation concentration assemblies are arranged on the feeding side and the discharging side of the intermediate tank 1 respectively and each includes:

[0037] The feeding pump 2;

[0038] The heating concentration unit includes a heater 3, a separator 4 and a circulating pump 16, the heater 3 has a live steam inlet 301 and a hot water outlet 302, the heater 3 is provided with a heating pipe extending into the separator 4, the separator 4 has a circulating outlet 401, a concentrated liquid outlet 402 and a secondary steam outlet 403, the circulating outlet 401 is communicated with the circulating pump 16 and the end of the heating pipe away from the separator 4, and the output end of the feeding pump 2 is communicated with the input end of the circulating pump 16;

[0039] The discharging pump 5, the input end of the discharging pump 5 is communicated with the concentrated liquid outlet 402;

[0040] The live steam treatment unit is used for discharging the hot water discharged from the hot water outlet 302 out of the system;

[0041] The secondary steam treatment unit is used for condensing the secondary steam discharged from the secondary steam outlet 403 into condensed water and then discharging the condensed water out of the system;

[0042] The buffer inlet 103 is communicated with the output end of the discharging pump 5 in the evaporation concentration assembly on the feeding side, and the buffer outlet 104 is communicated with the input end of the feeding pump 2 in the evaporation concentration assembly on the discharging side.

[0043] The two-stage evaporation concentration device adopts two evaporation concentration components to form two-stage evaporation concentration, and is suitable for evaporation concentration of industries such as chemical food, pharmaceutical, environmental protection engineering, waste liquid evaporation recovery, especially suitable for evaporation concentration of sodium hydrosulfide solution. The working principle is that the circulation of the material in the equipment mainly relies on external force, that is, forced flow generated by the circulating pump 16, and the circulation speed can reach 1.5-3.5 m / s. The evaporation device formed by the integral connection of the heater 3 and the separator 4 makes the material uniformly heated in the heating pipe through the circulating pump 16, the heat transfer coefficient is high, and the "pipe blocking" phenomenon can be prevented. The material enters the equipment from the bottom to the top by the circulating pump 16, flows upward along the heating pipe into the separator 4, and forms secondary steam upward in the low-temperature boiling vaporization in the negative pressure environment. The supernatant of the material is sucked into the heating pipe again by the forced circulating pump 16, and continues to circulate. The secondary steam generated by evaporation enters the secondary steam treatment unit for condensation treatment, and then forms condensed water which is discharged out of the system.

[0044] The high-concentration liquid produced by the evaporation concentration component on the feeding side enters the buffer cavity 101 of the intermediate tank 1 through the buffer inlet 103, and the live steam enters the heat preservation cavity 102 through the heat preservation steam inlet 105. The live steam is used for heat preservation of the liquid to prevent the decrease of flowability caused by the decrease of temperature, so that the high-concentration liquid with flowability can be discharged from the intermediate tank 1 through the buffer outlet 104 and enter the evaporation concentration component on the discharging side to continue the evaporation concentration treatment, and the hot water formed by heat exchange of the live steam is discharged from the heat preservation liquid outlet 106.

[0045] Compared with the prior art, the utility model has the following advantages:

[0046] I. Improve the concentration efficiency: through two-stage evaporation, the water in the aqueous solution can be removed more effectively, and the concentration of sodium hydrosulfide is improved;

[0047] II. Optimize energy utilization: reasonable design of working conditions and parameters of two-stage evaporation concentration components can make full use of energy and reduce energy consumption cost.

[0048] III. Improve the separation effect: two-stage evaporation helps to more thoroughly separate water and sodium hydrosulfide, and improve the purity of the product;

[0049] IV. Adapt to process requirements: according to the specific production process requirements, the two-stage evaporation concentration components can flexibly adjust the operating conditions to meet the product demand of different concentration and quality standards.

[0050] V. Enhance stability: evaporation in stages is conducive to controlling the temperature, pressure and other parameters in the whole process, making the production process more stable and reliable.

[0051] Six, reduce the load of the equipment: compared with single-stage evaporation concentration assembly, two-stage evaporation concentration assembly can share the workload, prolong the service life of the equipment, and reduce the maintenance cost;

[0052] Seven, reduce the requirement of material corrosion resistance: after using two-stage evaporation concentration assembly, the evaporation environment temperature can be reduced, thereby reducing the corrosiveness of the feed liquid, and further reducing the requirement of the device on the corrosion resistance of the material, thereby reducing the cost. Generally, the stainless steel grade of the equipment mainly contacting the material is 316L, the stainless steel of 304 material is selected for the equipment contacting steam and condensate, and the remaining structural parts and supporting parts are made of carbon steel material, which can meet the production requirements, and the whole machine can be extended to 5-10 years.

[0053] The main process flow of the evaporation concentration assembly for heating and evaporating the material is as follows:

[0054] S100, feeding: the solution containing solute is sent into the heating and concentration unit under the action of the feed pump 2, wherein the solute includes but is not limited to sodium hydrosulfide, in addition, for the evaporation concentration assembly on the feed side, the feed pump 2 mainly extracts the solution to be evaporated and concentrated from the raw liquid pool or raw liquid tank, and for the evaporation concentration assembly on the discharge side, the feed pump 2 mainly extracts the solution concentrated to a certain extent from the buffer cavity 101 of the intermediate tank 1;

[0055] S200, circulation: the circulation pump 16 is started, and the solution is pushed to flow through the heating pipe of the heater 3 at a high flow rate, then enters the separator 4, and after flowing out from the circulation outlet 401, is introduced into the heating pipe of the heater 3 by the circulation pump 16 to flow in a circulation manner;

[0056] S300, heating: the live steam enters the heater 3 from the live steam inlet 301, contacts the pipe wall of the heating pipe, and exchanges heat with the solution in the heating pipe through the pipe wall of the heating pipe, so that the solution is heated during the circulation flow;

[0057] S400, evaporation: after the heated solution enters the separator 4, part of the solvent rapidly vaporizes due to the reduction of pressure, forming a vapor-liquid mixture, that is, the secondary steam is mixed with liquid droplets;

[0058] S500, separation: after the secondary steam mixture is discharged through the secondary steam outlet 403, it is received by the secondary steam treatment unit, condensed to form condensate, and then discharged out of the system;

[0059] S600, discharging: with the circulating flow and heated evaporation of the solution, the concentration of the solution is constantly increasing, when the concentration of the solution reaches the preset concentration of the system, the concentrated solution is discharged from the bottom of the separator 4, and the concentrated solution is introduced into the evaporation and concentration assembly through the discharge pump 5; for the evaporation and concentration assembly on the feeding side, the discharge pump 5 introduces the concentrated solution into the buffer cavity 101 of the intermediate tank 1, and for the evaporation and concentration assembly on the discharging side, the discharge pump 5 discharges the concentrated solution out of the system.

[0060] Further improvement is that the intermediate tank 1 is connected with a stirring device 6, which comprises a stirring part 602 movably arranged in the buffer cavity 101 and a driving source 601 driving the stirring part 602 to move.

[0061] The stirring part 602 mainly comprises a stirring shaft and stirring blades, and the driving source 601 generally comprises a driving motor and a speed reducer, the driving motor is in transmission connection with the stirring shaft through the speed reducer, so that the stirring blades fixed on the outer periphery of the stirring shaft rotate in the buffer cavity 101, which increases the flowability of the solution after a certain degree of concentration, and cooperates with the live steam entering the heat preservation cavity 102 to heat the solution in the buffer cavity 101, thereby avoiding the decrease of the flowability of the solution in the buffer cavity 101 of the intermediate tank 1, which affects the subsequent concentration and evaporation treatment.

[0062] Further improvement is that the live steam treatment unit comprises a hot water tank 7 and a hot water pump 8, the hot water outlet 302 is in communication with the hot water tank 7, the input end of the hot water pump 8 is in communication with the hot water tank 7, and the output end of the hot water pump 8 is in communication with the outside.

[0063] The live steam enters the heater 3 through the live steam inlet 301 and exchanges heat with the solution to form hot water, which is discharged through the hot water outlet 302 and then collected in the hot water tank 7, and then the collected hot water is discharged out of the system by the hot water pump 8.

[0064] Further improvement is that the heat preservation liquid outlet 106 is in communication with the hot water tank 7 in the evaporation and concentration assembly on the discharging side.

[0065] After the above improvement, the live steam exchanges heat with the solution in the buffer cavity 101 to form hot water, which is discharged through the heat preservation liquid outlet 106 and then collected in the hot water tank 7.

[0066] Further improvement is that in the evaporation and concentration assembly on the feeding side, a preheating unit is further arranged between the output end of the feeding pump 2 and the heating and concentration unit, which is used to guide the hot water discharged by the hot water pump 8 to preheat the material output by the feeding pump 2.

[0067] The hot water flow discharged from the system by the hot water pump 8 is guided into the evaporation concentration assembly through the preheating unit on the feed side to exchange heat with the material at the output end of the feed pump 2, thereby preheating the material, i.e., the solution, increasing the temperature and flowability of the solution, cooperating with the heater 3 to enable the solution to quickly reach the evaporation temperature, thereby improving the evaporation efficiency and fully and reasonably utilizing the heat energy of the hot water to save energy consumption.

[0068] Further improvement is that the preheating unit comprises a preheater 9, the preheater 9 has a preheating inlet 901, a preheating outlet 902, a hot water inlet 903 and a hot water outlet 904, and the preheating inlet 901, the preheating outlet 902, the hot water inlet 903 and the hot water outlet 904 are respectively communicated with the output end of the feed pump 2, the input end of the circulating pump 16, the output end of the hot water pump 8 and the outside.

[0069] After the above structure is adopted, the solution is introduced into the preheater 9 through the preheating inlet 901 by the feed pump 2 and then discharged from the preheating outlet 902, and in the process of flowing of the solution, the hot water in the hot water tank 7 is introduced into the preheater 9 through the hot water inlet 903 by the hot water pump 8 to exchange heat with the solution, so that the temperature of the solution is increased and the temperature of the hot water is decreased, and then the hot water is discharged from the system through the hot water outlet 904.

[0070] Further improvement is that the preheater 9 is provided with at least two and is arranged in parallel.

[0071] After the above structure is adopted, the number of the preheater 9 is increased, so that the solution output by the feed pump 2 and the hot water output by the hot water pump 8 are divided into multiple paths, the heat exchange contact area of the hot water and the solution is ensured, the hot water and the solution can be fully contacted and heat exchanged, and the preheating of the solution is uniform and consistent.

[0072] Further improvement is that the feed pump 2 is provided with two feed pipes 201 and the two feed pipes 201 are both provided with feed valves 202, one of the two feed pipes 201 is communicated with the input end of the circulating pump 16, and the other feed pipe 201 is communicated with the preheating inlet 901.

[0073] The output end of the feed pump 2 has two feed pipes 201, one of the two feed pipes 201 enters the evaporation concentration unit again through the preheater 9, and the other feed pipe 201 directly enters the evaporation concentration unit, the communication and disconnection of the two ends of the feed pipe 201 are controlled by the opening and closing of the feed valve 202, in actual operation, one of the two feed pipes 201 can be selected for the solution to pass through, and the other feed pipe 201 can be used for cleaning and maintenance, etc., so as to facilitate the continuous operation of the device and improve the evaporation concentration efficiency.

[0074] Further improvement is that a mist catcher 15 is further arranged between the separator 4 and the secondary steam treatment unit, the mist catcher 15 has a separation inlet 1501, an exhaust outlet 1502, a liquid outlet 1503, the separator 4 is further provided with a backflow port 404, the secondary steam outlet 403 is communicated with the separation inlet 1501, the exhaust outlet 1502 is connected with the secondary steam treatment unit, and the liquid outlet 1503 is communicated with the backflow port 404.

[0075] The mist catcher 15 is used for separating the secondary steam and liquid drops. Since the mixture discharged from the secondary steam outlet 403 of the separator 4 is composed of the secondary steam and the liquid drops entrained in the secondary steam, after the mixture enters the mist catcher 15 through the separation inlet 1501, the gas-liquid separation is realized through the mist catcher 15, so that the pure secondary steam is discharged from the exhaust outlet 1502 into the secondary steam treatment unit, and the separated liquid drops are discharged from the liquid outlet 1503 and returned to the separator 4 through the backflow port 404 to continue the evaporation and concentration treatment, thereby improving the solute recovery rate.

[0076] Further improvement is that the secondary steam treatment unit comprises a condenser 10, a tail cooler 11, a condensate tank 12, a condensate pump 13 and a vacuum pump 14, the condenser 10 has a first cooling water inlet 1001, a first cooling water outlet 1002, a secondary steam inlet 1003, a condensate outlet 1004 and a first non-condensed gas outlet 1005, the tail cooler 11 is provided with a second cooling water inlet 1101, a second cooling water outlet 1102, a second non-condensed gas inlet 1103, a condensate inlet 1106, a condensate discharge port 1104 and a second non-condensed gas outlet 1105, the first cooling water inlet 1001 and the second cooling water inlet 1101 are used for introducing cooling water, the first cooling water outlet 1002 and the second cooling water outlet 1102 are used for discharging cooling water, the condensate outlet 1004 is communicated with the condensate inlet 1106, the condensate discharge port 1104 is communicated with the condensate tank 12, the condensate tank 12 is communicated with the outside through the condensate pump 13, and the first non-condensed gas outlet 1005 and the second non-condensed gas outlet 1105 are both communicated with the outside through the vacuum pump 14.

[0077] Specifically, as shown in Figure 5 The condenser 10 has three first non-condensed gas outlets 1005, one of which is communicated with the condensate tank 12, and the other two are communicated with the second non-condensed gas inlet 1103, the second non-condensed gas inlet 1103 is communicated with the input end of the vacuum pump 14 through the second non-condensed gas outlet 1105; the condenser 10 is further provided with a condensate communication port 1006; and the condensate inlet 1106 is communicated between the condensate discharge port 1104 and the condensate communication port 1006.

[0078] The purified secondary steam discharged from the demister 15 enters the condenser 10 through a secondary steam inlet 1003, and the circulating cooling water is introduced through a first cooling water inlet 1001 to cool and condense the secondary steam, and the circulating cooling water is discharged from a first cooling water outlet 1002 while the secondary steam is condensed to form condensed water; the non-condensable gas in the secondary steam enters the tail condenser 11 through a first non-condensable gas outlet 1005 and a second non-condensable gas inlet 1103, and the circulating cooling water is introduced through a second cooling water inlet 1101 to exchange heat with the non-condensable gas, and the circulating cooling water is discharged through a second cooling water outlet 1102 after being cooled, and the non-condensable gas is discharged from a second non-condensable gas outlet 1105 and is discharged from the system through a vacuum pump 14; the condensed water can enter the tail condenser 11 from the condenser 10 through the intercommunication condensed water intercommunication port 1006 and the condensed water inlet 1106, and is introduced into the condensed water tank 12 after being discharged from the condensed water discharge port 1104.

[0079] Further improvement is that the output end of the condensed water pump 13 is connected with a flushing pipe 1301, the flushing pipe 1301 is provided with a flushing valve, and the flushing pipe 1301 is in communication with the separator 4, the input end of the circulating pump 16, the input end of the discharge pump 5 and the output end of the discharge pump 5.

[0080] Specifically, in the utility model, the flushing pipe 1301 is provided with five, respectively with the separator 4 inner chamber, the input end of the circulating pump 16, the output end of the circulating pump 16, the output end of the discharge pump 5 and the separation inlet 1501 of the demister 15 are communicated, and each flushing pipe 1301 is provided with a flushing valve. After adopting the above structure, when the equipment is maintained, the flushing valve is opened, the condensed water pump 13 can extract the condensed water in the condensed water tank 12, flows along the pipeline of the flushing pipe 1301, and flushes the inside of the separator 4, the pipeline of the input end and the output end of the circulating pump 16, the pipeline of the output end of the discharge pump 5 and the inside of the demister 15 with condensed water, and the attached crystallization, precipitate and other sundries are removed through the flushing condensed water, to ensure that the pipeline is unobstructed, thereby facilitating the flow of the solution, to improve the evaporation concentration efficiency and avoid the phenomenon of pipe blockage.

[0081] The above only describes the preferred embodiments of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A two-stage evaporation concentration apparatus for a sodium sulfide solution containing sulfur, characterized by, The utility model relates to a kind of evaporative concentration systems, including: Intermediate tank (1), the inner cavity of the intermediate tank (1) includes separate buffer cavity (101) and heat preservation cavity (102), the intermediate tank (1) is provided with buffer inlet (103), buffer outlet (104), heat preservation steam inlet (105) and heat preservation liquid outlet (106), the buffer inlet (103) and the buffer outlet (104) are communicated with the buffer cavity (101), the heat preservation steam and the heat preservation liquid outlet (106) are communicated with the heat preservation cavity (102); Two evaporation concentration assemblies, two the evaporation concentration assemblies are respectively arranged in the feed side and the discharge side of the intermediate tank (1) and each include: Feed pump (2); Heating concentration unit, the heating concentration unit includes heater (3), separator (4) and circulating pump (16), the heater (3) has live steam inlet (301) and hot water outlet (302), the heater (3) is provided with heating pipe extending into the separator (4), the separator (4) has circulating outlet (401), concentrated liquid outlet (402) and secondary steam outlet (403), the circulating outlet (401) is communicated with the circulating pump (16) and the one end of the heating pipe away from the separator (4), the output end of the feed pump (2) is communicated with the input end of the circulating pump (16); Discharge pump (5), the input end of the discharge pump (5) is communicated with the concentrated liquid outlet (402); Live steam processing unit, the live steam processing unit is used to discharge the hot water discharged from the hot water outlet (302) outside the system; Secondary steam processing unit, the secondary steam processing unit is used to condense the secondary steam discharged from the secondary steam outlet (403) into condensed water and then discharge outside the system; The buffer inlet (103) is communicated with the output end of the discharge pump (5) in the evaporation concentration assembly of feed side, and the buffer outlet (104) is communicated with the input end of the feed pump (2) in the evaporation concentration assembly of discharge side.

2. The two-stage evaporation concentration device of a sodium sulfide solution containing sulfur according to claim 1, characterized by: The intermediate tank (1) is connected with stirring device (6), and the stirring device (6) includes stirring part (602) movably arranged in the buffer cavity (101) and driving source (601) for driving the stirring part (602) to move.

3. The two-stage evaporation concentration device of sodium sulfide solution according to claim 1, characterized in that: The live steam processing unit includes hot water tank (7) and hot water pump (8), the hot water outlet (302) is communicated with the hot water tank (7), the input end of the hot water pump (8) is communicated with the hot water tank (7), and the output end of the hot water pump (8) is communicated with the outside.

4. The two-stage evaporation concentration device of a sodium sulfide solution containing sulfur according to claim 3, characterized by: The heat preservation liquid outlet (106) is communicated with the hot water tank (7) in the evaporation concentration assembly of discharge side.

5. The two-stage evaporation concentration device of sodium sulfide solution according to claim 3, characterized in that: In the evaporation concentration assembly of feed side, the output end of the feed pump (2) and the heating concentration unit are further provided with preheating unit, and the preheating unit is used to guide the hot water discharged from the hot water pump (8) to preheat the material output by the feed pump (2).

6. The two-stage evaporation concentration device of a sodium sulfide solution containing sulfur according to claim 5, characterized by: The preheating unit comprises a preheater (9) having a preheating inlet (901), a preheating outlet (902), a hot water inlet (903) and a hot water outlet (904), which are communicated with the output end of the feeding pump (2), the input end of the circulating pump (16), the output end of the hot water pump (8) and the outside environment respectively.

7. The two-stage evaporation concentration device of a sodium sulfide solution containing sulfur according to claim 6, characterized by: The preheater (9) is provided with at least two and is arranged in parallel.

8. The two-stage evaporation concentration device of sodium sulfide solution according to claim 6, characterized in that: The feeding pump (2) is provided with two feeding pipes (201) and feeding valves (202) arranged on the two feeding pipes (201), one of which is communicated with the input end of the circulating pump (16) and the other of which is communicated with the preheating inlet (901).

9. The two-stage evaporation concentration device of sodium sulfide solution according to claim 1, characterized in that: The secondary steam treatment unit comprises a condenser (10), a tail cooler (11), a condensate tank (12), a condensate pump (13) and a vacuum pump (14), the condenser (10) has a first cooling water inlet (1001), a first cooling water outlet (1002), a secondary steam inlet (1003), a condensate outlet (1004) and a first non-condensable gas outlet (1005), the tail cooler (11) is provided with a second cooling water inlet (1101), a second cooling water outlet (1102), a second non-condensable gas inlet (1103), a condensate inlet (1106), a condensate discharge port (1104) and a second non-condensable gas outlet (1105), the first cooling water inlet (1001) and the second cooling water inlet (1101) are used for introducing cooling water, the first cooling water outlet (1002) and the second cooling water outlet (1102) are used for discharging cooling water, the condensate outlet (1004) is communicated with the condensate inlet (1106), the condensate discharge port (1104) is communicated with the condensate tank (12), the condensate tank (12) is communicated with the outside environment through the condensate pump (13), and the first non-condensable gas outlet (1005) and the second non-condensable gas outlet (1105) are communicated with the outside environment through the vacuum pump (14).

10. The two-stage evaporation concentration device of a sodium sulfide solution containing sulfur according to claim 9, characterized by: The output end of the condensate pump (13) is connected with a flushing pipe (1301) provided with a flushing valve, which is communicated with the separator (4), the input end of the circulating pump (16), the input end and the output end of the discharging pump (5).

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