WO2018064980A1

WO2018064980A1 - Mobile continuous salt dissolving system and salt dissolving method thereof

Info

Publication number: WO2018064980A1
Application number: PCT/CN2017/105352
Authority: WO
Inventors: 曾智勇; 陈武忠; 崔小敏; 黄贝
Original assignee: 深圳市爱能森科技有限公司
Priority date: 2016-10-09
Filing date: 2017-10-09
Publication date: 2018-04-12
Also published as: CN106390865A

Abstract

A solar thermal power generation technology, particularly relates to a mobile continuous salt dissolving system and a salt dissolving method thereof. The salt dissolving system comprises a salt dissolving bath system, a heating system and a molten salt temporarily-storage system. The salt dissolving bath system and the molten salt temporarily-storage system are communicated with each other by a molten salt pipeline; the heating system is disposed at the bottom of the salt dissolving bath system; the salt dissolving bath system comprises a salt dissolving bath (1) of which the top is provided with a feed inlet (2), a blender (3) connection port and a thermometer (4) connection port; the blender (3) and the thermometer (4) are mounted by means of the blender (3) connection port and the thermometer (4) connection port; a first communication port (5) and a second communication port (6) are respectively disposed top and bottom on a side wall of the salt dissolving bath (1); the molten salt temporarily-storage system comprises a buffer tank (8) and a molten salt pump (9); a third communication port (10) and a fourth communication port (11) are respectively disposed top and bottom on a side wall, close to the salt dissolving bath (1), of the buffer tank (8); pipeline communication indicates that: the first communication port (5) is communicated with the third communication port (10) via a first pipeline (12); the second communication port (6) is communicated with the fourth communication port (11) via a second pipeline (13); and the second pipeline (13) is provided with a first valve (14).

Description

Mobile continuous salt system and salt method thereof

cross reference

The invention enjoys the priority of the Chinese invention patent application filed on October 09, 2016, entitled "A mobile continuous salt system and its salt method", the application number of the Chinese invention patent application of 201610881995.6, the above-mentioned Chinese invention patent application The entire content is hereby incorporated by reference in its entirety for all purposes.

Technical field

The invention relates to a solar thermal power generation technology, in particular to a movable continuous salt system and a salt thereof method.

Background technique

The International Energy Agency believes that the installed capacity of CSP stations will continue to rise in the future, and predicts the future global installed capacity of solar thermal power and annual power generation. According to forecasts, by 2020, the installed capacity of CSP will reach 11GW, and the global light will be 2020. The total installed capacity of thermal power plants is expected to double.

As the core part of the solar thermal power station, the heat storage system can enhance the adaptability of solar thermal power stations to solar radiation fluctuations. The heat storage energy storage system and the power generation capacity of the system are very important for the solar thermal power generation system. It not only requires the heat storage system to have better heat storage capacity, but also requires the heat storage system to transfer heat to the working medium in time to achieve In the case of weakening of the solar radiation, the steam turbine inlet parameters are not suddenly reduced. Molten salt is the most commonly used heat storage material. Since the molten salt is solid at normal temperature and the molten salt is liquid when used, initial salting and filling become one of the keys to system operation.

At present, most of the power stations are self-built system equipment. Once they are put into use and used once, the system economy is poor. When the salt is initialized, the molten salt is easy to overheat and deteriorate. Therefore, it is necessary to develop a new type of salt system which has high utilization rate and is not easily overheated by molten salt.

Summary of the invention

According to the deficiencies and needs of the above-mentioned fields, the present invention provides a movable continuous salt system, which has high flexibility, can be repeatedly used and avoids overheating of molten salt, and effectively solves the low utilization rate of molten salt system, molten salt. The problem of overheating.

In one aspect, the present invention provides a mobile continuous salt system, comprising: a salting tank system, a heating system, and a molten salt buffer system for transporting with a carrier system on a carrier system;

The salt tank system and the molten salt buffer system are connected by a molten salt pipeline; the heating system is disposed at the bottom of the salt tank system for heating the molten salt in the salt tank;

The salt tank system includes a salt tank; a top of the salt tank is provided with a feed port, a stirrer connection port and a thermometer connection port; and the agitator connection port is used for installing a stirrer to make the agitator The stirring component is located in the salting tank, and the control part of the agitator is located above the top of the salting tank; the thermometer connecting port is used for installing the thermometer, so that the detecting end of the thermometer is located in the salt bath, and the reading end is located above the top of the salt tank ;

a first communication port and a second communication port are respectively disposed on one side of the groove wall of the salt tank; the second communication port is disposed at a position close to the bottom of the salt bath;

The molten salt buffer system includes a buffer tank and a molten salt pump; a top of the buffer tank is provided with a molten salt pump connection port for sealingly connecting a molten salt pump, and the molten salt pump melts the buffer tank The molten salt is pumped into the molten salt tank;

a third communication port and a fourth communication port are respectively disposed above and below the tank wall of the buffer tank adjacent to the salt tank;

The duct communication means that the first communication port communicates with the third communication port through the first duct; the second communication port communicates with the fourth communication port through the second duct; and the third communication port has a low position in the connected state. In the first communication port, the position of the fourth communication port is lower than the second communication port; and the first pipe is provided with the first valve.

The movable continuous salt system provided by the invention, the salt tank is the main container of the salt, preferably the horizontal salt tank of the elliptical head. The feed port is for adding a solid molten salt and/or water to the salt bath. The control part of the agitator is located above the top of the salting tank. During the heating process, the stirring speed of the stirring part is adjusted by the control part to uniformly heat the molten salt to prevent the phenomenon of local molten salt overheating. The reading end of the thermometer is located above the top of the salting tank, and is used for monitoring the temperature at any time, so as to adjust the heating speed and the stirring speed in time to prevent the molten salt temperature from being too high and deteriorate. A first communication port and a second communication port are provided on the groove wall on the side of the salt bath for discharging the liquid molten salt. In order to drain the liquid molten salt in the salt bath as much as possible, the second communication port is preferably disposed at a position close to the bottom of the salt bath.

The buffer tank is disposed on a side of the salt bath having a communication port for temporarily storing the liquid molten salt from the salt bath. In the process of continuously salting, the liquid molten salt is continuously pumped into the molten salt tank by a molten salt pump. The buffer tank is used to buffer the liquid molten salt, which can separate the molten salt pump from the agitator, thermometer and electric heater, avoid collision between components during operation, and greatly reduce the liquid of the molten salt pump. The lower shaft is long, so that a cheaper pump can be used to save costs, and the liquid molten salt can be prevented from being repeatedly heated in the salt bath to cause the molten salt to overheat. A third communication port and a fourth communication port are provided on the side of the tank on the side of the buffer tank close to the salt tank for receiving the liquid molten salt from the salt bath.

In the initial stage of salt formation and continuous salting, the first valve is closed, and when the molten salt level in the salt tank is higher than the first communication port, The liquid molten salt can automatically flow out of the salt tank through the first communication port and flow into the buffer tank through the first pipe and the third communication port. When the molten salt level in the buffer tank reaches the set position, the molten salt pump is turned on. The liquid molten salt is pumped into the molten salt tank to achieve continuous salting by controlling the feed rate of the solid molten salt and the pumping rate of the liquid molten salt. In the later stage of the salt, no solid molten salt is added. When the molten salt level is lower than the first communication port, the first valve is opened, so that the liquid molten salt flows out of the salt tank through the second communication port and passes through the second pipe and the first pipe. 4 The communication port flows into the buffer tank. Preferably, in the connected state, the position of the third communication port is equal to the position height of the bottom of the salt bath and higher than the minimum required liquid level of the molten salt pump.

The salt tank system, the heating system and the molten salt buffer system can all be arranged on the carrying system, and can be flexibly moved with the carrying system to facilitate the solar thermal power station requiring salt.

Preferably, a second valve is disposed at the inlet, a first pressure relief valve is disposed at a top of the salt tank, and a second pressure relief valve is disposed at a top of the buffer tank. The second valve is used to open and close the feed port. In some embodiments, after the solid molten salt is added through the feed port, a certain amount of water is preferably added, and the water is evaporated in the initial stage of the salt, and the pressure threshold of the first pressure relief valve and the second pressure relief valve can be avoided. The system is overpressured and dangerous.

Preferably, the agitator and the thermometer are respectively sealedly connected between the position of the agitator connection port and the thermometer connection port and the top of the salt bath. The salt tank is sealed in the molten salt heating process to prevent heat loss.

Preferably, the first communication port and the second communication port are provided with a filter screen; preferably, the filter mesh has a hole diameter of 20 to 200 μm. In some embodiments, the first communication port and the second communication port are respectively provided with a filter screen that completely covers the first communication port and the second communication port. When the salt is formed, part of the solid molten salt floats above the liquid molten salt, and the filter prevents the solid molten salt from entering the buffer tank through the first communication port or the second communication port, and can effectively prevent solid impurities that are not melted in the molten salt. Entering the molten salt system avoids blockage of molten salt pipes and prevents major accidents.

Preferably, the inner bottom surface of the salting tank has a sloped surface, and one end adjacent to the buffer tank is lower than the opposite end; preferably, the horizontal angle of the slope surface is 1 to 12 degrees. In the final stage of the salt, the slope surface can ensure that the remaining liquid molten salt in the salt tank is discharged into the buffer tank through the second communication port to avoid waste of molten salt.

Preferably, the top of the salting tank is further provided with a nitrogen gas port for connecting a nitrogen gas supply device; and/or a circulation port for injecting a molten salt having a lowered temperature. By introducing nitrogen into the salt bath, air and water vapor can be removed, the molten salt component can be prevented from oxidizing, and the system pressure balance can be ensured, and the pressure is always in a micro-positive pressure state. When the salt is massed for a long time, the temperature of the molten salt in the molten salt tank is gradually lowered. When it reaches a certain level, the molten salt whose temperature is lowered is pumped back to the salt bath through the circulation port to be heated.

Preferably, the buffer tank is provided with a discharge port on the tank wall near the bottom, the discharge port is externally connected to the discharge pipe, and the discharge pipe is provided with a third valve. In the process of salting, the third valve is closed; after the salt is finished, the third valve is opened and the buffer is buffered. The remaining molten salt in the tank is discharged, and then the salt tank and the buffer tank are washed with water and discharged through the discharge pipe.

Preferably, any of the above-described movable continuous salt systems further comprises a charging system comprising a manual feeding station and/or an automatic mechanical feeding device. In some embodiments, the operator is standing on a manual loading station, and by means of the feed hopper, a solid molten salt is manually added to the salt bath through the feed port. In other embodiments, the solid molten salt is automatically fed into the salt bath using a mechanical feeding means by means of a conveyor belt or the like.

Preferably, any of the above-described movable continuous salt systems, the heating system comprising a casing, the casing of the heating system being connected to the salting tank by a flange; the heating system comprising an electric heater and / or natural gas combustion chamber. In some embodiments, the heating system is provided with an electric heater and a natural gas combustion chamber at the same time, and the molten salt may be heated by any one of the heat sources to prevent the continuous progress of the salt when a certain heat source fails.

In another aspect, the present invention provides a method of continuously salting, characterized in that any of the above-described mobile continuous salt systems is employed, comprising the steps of:

(1) initial stage of salt: a solid molten salt is charged into the salt bath; the stirrer is turned on, and the heating system is turned on to melt the molten salt;

(2) Continuous salt: the solid molten salt is continuously added to the salt tank. When the liquid molten salt level is higher than the first communication port, the molten salt will automatically flow into the buffer tank; when the molten salt level in the buffer tank When the set position is reached, the molten salt pump is turned on, and the liquid molten salt is pumped to the molten salt tank; the rate of addition of the solid molten salt and the pumping rate of the molten salt pump are controlled to make the liquid molten salt liquid in the salt bath It is always higher than the first communication port and the liquid molten salt level in the buffer tank is always higher than the minimum required liquid level of the molten salt pump, so that the salt is continuously performed.

In some embodiments of the invention, the rate of addition of the molten salt is controlled by the valves of the automatic mechanical feeding device and the charging system, and the pumping rate of the molten salt is controlled by a variable frequency motor of the molten salt pump.

In summary, the movable continuous salt system and the continuous salt method provided by the present invention have the following advantages compared with the prior art:

1. Solved the problem that the system molten salt is easy to overheat.

2. Solved the problem of poor flexibility of salt production equipment. With the movable continuous salt system of the invention, the power station does not need to be equipped with a salt device by itself, realizes resource reuse, saves economic cost, and has wide application prospects.

3. Solve the problem of easy oxidation and pressure imbalance during the heating process of salt.

4. A variety of heat-sourced salts ensure the normal operation of the salt.

DRAWINGS

Figure 1. Schematic diagram of a movable continuous salt system;

Among them, 1-salt tank, 2-feed port, 3-mixer, 4-thermometer, 5-first communication port, 6-second communication port, 7-salt tank bottom plate, 8-buffer tank, 9 - molten salt pump, 10 - 3rd communication port, 11 - 4th communication port, 12 - 1st pipe, 13 - 2nd pipe, 14 - 1st valve, 15 - 1st pressure relief valve, 16 - 2nd drain Pressure valve, 17-filter, 18-nitrogen port, 19-circulation port, 20-discharge port, 21-electric heater, 22-natural gas combustion chamber, 23-car.

Figure 2. Schematic diagram of the filter structure.

detailed description

The present invention is further described in detail with reference to the accompanying drawings.

The present invention provides a mobile continuous salt system, comprising: a salting tank system, a heating system, and a molten salt buffer system for transporting and transporting with a carrier system on a carrier system; The system and the molten salt buffer system are connected by a molten salt pipe; the heating system is disposed at the bottom of the salting tank system for heating the molten salt in the salt tank; the salt tank system comprises a salt tank 1; The top of the salt tank 1 is provided with a feed port 2, a stirrer connection port and a thermometer connection port; the agitator connection port is used to install the agitator 3, and the agitating part of the agitator 3 is located in the salt tank 1 The control part of the agitator 3 is located above the top of the salting tank 1; the thermometer connection port is used for installing the thermometer 4, so that the detecting end of the thermometer 4 is located in the salting tank 1, and the reading end is located above the top of the salting tank 1; a first communication port 5 and a second communication port 6 are respectively disposed on one side of the groove wall of the salt tank 1; the second communication port 6 is disposed at a position close to the salt bath floor 7; The buffer system includes a buffer tank 8 and a molten salt pump 9; the buffer tank a molten salt pump connection port is provided at the top of the 8 for sealingly connecting the molten salt pump 9, and the molten salt pump 9 pumps the molten salt melted in the buffer tank 8 into the molten salt tank; the buffer tank 8 The third communication port 10 and the fourth communication port 11 are respectively disposed above and below the tank wall adjacent to the salt tank 1; the pipe communication means that the first communication port 5 passes through the first pipe 12 and the third pipe The communication port 10 is connected to each other; the second communication port 6 communicates with the fourth communication port 11 through the second duct 13; in the connected state, the position of the third communication port 10 is lower than the first communication port 5, and the fourth communication port 11 The position is lower than the second communication port 6; the first pipe 14 is provided on the second pipe 13.

The movable continuous salt system provided by the invention, the salt tank 1 is the main container of the salt, preferably the horizontal salt tank of the elliptical head, and the elliptical head can avoid the dead corner of the molten salt easily. The feed port 2 is used to add a solid molten salt and/or water into the salt bath 1 . The control part of the agitator 3 is located above the top of the salting tank 1. During the heating process, the stirring speed of the stirring part is adjusted by the control part to uniformly heat the molten salt to prevent the phenomenon of local molten salt overheating. Place The reading end of the thermometer 4 is located above the top of the salt bath 1 for monitoring the temperature at any time, so as to adjust the heating speed and the stirring speed in time to prevent the molten salt temperature from being too high and deteriorate. The first communication port 5 and the second communication port 6 are provided on the groove wall on the side of the salt bath 1 for discharging the liquid molten salt. In order to drain the liquid molten salt in the salt bath 1 as much as possible, the second communication port 6 is preferably disposed at a position close to the salt bath floor 7. Preferably, the lower edge of the second communication port 6 is separated from the salt bath floor. 40 to 100 cm, more preferably 60 to 80 cm.

The buffer tank 8 is disposed on a side of the salt bath 1 having a communication port for temporarily storing the liquid molten salt from the salt bath. In the process of continuously salting, the liquid molten salt is continuously pumped into the molten salt tank by the molten salt pump 9. In some embodiments, the outer side of the buffer tank 8 is covered with a thick insulation layer to prevent the buffer tank temperature from dropping too fast. The use of the buffer tank 8 for buffering the liquid molten salt has the following advantages: (1) isolating the bearing of the molten salt pump 9 from the agitator 3, the thermometer 4, the electric heater 21, etc., to avoid occurrence of components between the components during operation. (2) Since the height of the buffer tank 8 is lower than the height of the salt tank 1, the liquid shaft length of the molten salt pump 9 can be greatly reduced, so that a cheaper pump can be selected to save costs; (3) timely The liquid molten salt in the salt bath 1 is introduced into the buffer tank 8, and the liquid molten salt can be effectively prevented from being repeatedly heated in the salt bath 1 to cause the molten salt to overheat. A third communication port 10 and a fourth communication port 11 are provided on the side wall of the buffer tank 8 adjacent to the salt bath 1 for receiving the liquid molten salt from the salt bath 1.

When the salt is initialized and the salt is continuously reduced, the first valve 14 is closed to prevent the solid matter at the bottom of the salt bath 1 from entering the buffer tank 8. When the molten salt level in the salt tank 1 is higher than the first communication port 5, the liquid molten salt can automatically flow out of the salt tank 1 through the first communication port 5 and flow into the buffer through the first pipe 12 and the third communication port 10. In the tank 8, when the molten salt level in the buffer tank 8 reaches the set position, the molten salt pump 9 is turned on, and the liquid molten salt is pumped into the molten salt tank, and the feed rate and liquid molten salt of the solid molten salt are controlled. The pumping rate is achieved to achieve continuous salting. In some embodiments, the molten salt pump 9 is turned on when the molten salt level in the buffer tank 8 reaches 30 cm above the minimum liquid level position of the molten salt pump of the buffer tank. In the late stage of the salt, the solid molten salt is no longer added. When the molten salt liquid level is lower than the first communication port 5, the first valve 14 is opened, and the liquid molten salt flows out of the salt tank 1 through the second communication port 6 and passes through the first The pipe 13 and the fourth communication port 11 flow into the buffer tank 8. Preferably, in the connected state, the position of the third communication port 10 is equivalent to the height of the bottom of the salt bath 1 and higher than the minimum required level of the molten salt pump 9.

In some embodiments, a second valve is disposed at the feed port 2, a first pressure relief valve 15 is disposed at the top of the salt tank 1, and a second pressure relief valve is disposed at the top of the buffer tank 8. 16.

In some embodiments, after the solid molten salt is added through the feed port 2, a certain amount of water is preferably added, and the water is evaporated in the initial stage of the salt, by setting the pressure thresholds of the first pressure relief valve 15 and the second pressure relief valve 16. Can avoid system overpressure Dangerous. Preferably, the pressure threshold of the first pressure relief valve 15 and the second pressure relief valve 16 is set to 0.1 to 1 MPa, and more preferably 0.2 to 0.7 MPa.

In some embodiments, the agitator 3 and the thermometer 4 are sealingly connected between the agitator connection port and the thermometer connection port and the top of the salt bath tank, respectively. The salt bath 1 is sealed in the molten salt heating process to prevent heat loss.

In some embodiments, the first communication port 5 and the second communication port 6 are respectively provided with a screen 17 that completely covers the first communication port 5 and the second communication port 6. The sieve 17 preferably has a pore diameter of 20 to 200 μm, more preferably 20 to 100 μm, and most preferably 70 μm. When the salt is formed, a part of the solid molten salt floats above the liquid molten salt, and the filter 17 prevents the solid molten salt from entering the buffer tank 8 through the first communication port 5 or the second communication port 6, and can effectively prevent the molten salt from being dissolved. The molten solid impurities enter the molten salt system, avoiding blockage of the molten salt pipe and preventing major accidents.

In some embodiments, the inner bottom surface of the salt bath 1 has a sloped surface, and one end adjacent to the buffer tank 8 is lower than the opposite end; the horizontal angle of the slope surface is preferably 1 to 12 degrees, It is preferably 2 to 10 degrees, and most preferably 5 degrees. In the final stage of the salting, the slope surface ensures that the remaining liquid molten salt in the salt bath 1 is discharged into the buffer tank 8 through the second communication port 6, thereby avoiding waste of molten salt.

In some embodiments, the top of the salt bath 1 is further provided with a nitrogen port 18 for connecting a nitrogen supply device; and/or a circulation port 19 for injecting a molten salt having a lowered temperature. By introducing nitrogen into the salt bath 1, the air and water vapor can be removed, the molten salt component can be prevented from being oxidized, and the system pressure balance can be ensured, and the pressure is always in a micro-positive pressure state.

In some embodiments, the circulation port 19 is connected to the pump outlet in the molten salt tank through a pipe for injecting a molten salt having a lowered temperature into the salting tank 1. When the salt is mass-produced for a long time, the molten salt temperature in the molten salt tank is gradually lowered, and to a certain extent, the molten salt having a lowered temperature is pumped back to the salt bath 1 through the circulation port 19 to be heated.

In some embodiments, the buffer tank 8 is provided with a discharge port 20 on the tank wall near the bottom, the discharge port 20 is externally connected to the discharge pipe, and the discharge pipe is provided with a third valve. In the process of salting, the third valve is closed; after the salt is finished, the third valve is opened, the remaining molten salt in the buffer tank 8 is discharged, and then the salt tank 1 and the buffer tank 8 are washed with water and the sewage is discharged through the discharge pipe. .

In some embodiments, any of the above-described movable continuous salt systems further includes a feed system comprising a manual feed station and/or an automated mechanical feed device. The operator stands on the manual feeding table, and the solid molten salt can be manually added to the salt tank 1 through the feed port 2 by means of the feed hopper. Alternatively, the solid molten salt is automatically fed into the salt bath 1 by means of a mechanical feeding method by means of a conveyor belt or the like.

In some embodiments, the mechanical feeding device includes a bag unpacking machine, a crusher, a belt loader feeder, and a corrugated rib Belt conveyor. The system has a ton bag unpacking machine to separate the molten salt. The bag unpacking machine has a crushing device to crush the material. A belt-type weighing feeder is arranged below the discharge hopper of the bag-removing machine, and the material after the bag-removal can be fed according to a certain ratio. The material is sent to the salt tank 1 for mixing operation through a certain bandwidth, the inclination angle is 60°, and the C-1 corrugated belt conveyor with a belt speed of 1 m/s is sent.

In some embodiments, any of the above-described movable continuous salt systems, the heating system comprising a housing, the housing of the heating system being flanged to the salt bath 1; the heating system comprising Electric heater 21 and/or natural gas combustion chamber 22. Preferably, the heating system is provided with an electric heater 21 and a natural gas combustion chamber 22 at the same time, and the molten salt can be heated by any heat source to prevent the continuous progress of the salt when a certain heat source fails.

In some embodiments, the natural gas combustion chamber 22 is disposed at the bottom of the salt bath tank 1, below the salt tank bottom plate 7, and is externally connected to the on-site natural gas pipeline; the electric heater 21 is disposed at a height of 20-50 cm above the salt bath tank bottom plate 7. Place, each electric heater is evenly arranged, the electric heater is connected with the electronic control cabinet outside the salt bath, and the heating power is controlled by the electronic control cabinet to prevent the molten salt from overheating. When salt is used, if the electric heater is selected for heating, the molten salt should completely cover the electric heater.

(1) initial salt: a solid molten salt is charged into the salt bath 1; the stirrer 3 is turned on, and the heating system is turned on to melt the molten salt;

(2) Continuous salt: the solid molten salt is continuously added to the salt tank 1. When the liquid molten salt liquid level is higher than the first communication port 5, the molten salt will automatically flow into the buffer tank 8; when in the buffer tank 8 When the molten salt liquid level reaches the set position, the molten salt pump 9 is turned on, and the liquid molten salt is pumped to the molten salt tank; the rate of addition of the solid molten salt and the pumping rate of the molten salt pump 9 are controlled to make the salt tank 1 The liquid molten salt liquid level is always higher than the first communication port 5 and the liquid molten salt liquid level in the buffer tank 8 is always higher than the minimum required liquid level of the molten salt pump 9, so that the salt is continuously performed.

In a typical embodiment, the following steps are included:

(1) Initial stage of salt: Close the first valve, open the feed port 2, and add a certain amount of solid molten salt through the feed port 2 to cover the electric heater 21 by manual or mechanical feeding. An external water source is added with a certain amount of water through the feed port 2; then the feed port 2 is closed, the agitator 3 is turned on, one of the electric heater 21 or the gas furnace is turned on, and the salt is started; in the process of water evaporation, the tank body When the pressure in the middle reaches a certain value, the pressure of the system is lowered by the first pressure relief valve 15 and the second pressure relief valve 16 to avoid the danger of overpressure of the system; after the water in the molten salt is completely evaporated, the molten salt is melted and solid is added. Molten salt, open the formal salt process; pass nitrogen, empty the water vapor and air in the system to ensure the system's micro-positive pressure.

(2) continuous salt: reopen the feed port 2, continue to add solid molten salt, when the liquid molten salt liquid level exceeds the first connection After the mouth 5, the molten salt will automatically flow into the buffer tank 8; when the molten salt level in the buffer tank 8 reaches a certain position, the molten salt pump 9 is turned on, and the liquid molten salt is pumped to the molten salt tank; The ability to control the rate of addition of solid molten salt through the valves of the automatic mechanical feeding equipment and the feeding system, and the pumping rate of the molten salt is controlled by the variable frequency motor of the molten salt pump 9, so that the liquid molten salt level in the salt tank 1 is always high. The liquid molten salt liquid level in the first communication port 5 and in the buffer tank 8 is always higher than the minimum required liquid level of the molten salt pump 9, and the continuous progress of the salt is ensured.

(3) Late salting: after the end of the solid molten salt addition, the feed port 2 is closed; when the liquid level in the salt tank 1 is lower than the first communication port 5, the first valve 14 is opened to make the salt tank 1 The liquid molten salt flows into the buffer tank 8 through the second communication port 6; when the molten salt level in the buffer tank 8 is lower than the minimum liquid level required by the molten salt pump 9, the molten salt pump 9 is turned off; A small amount of molten salt is still stored, which can be discharged through the discharge port 20. Since the residual molten salt is less in this part, it can be directly put into the molten salt tank; the clean water is washed through the feed port 2, the cleaning equipment is passed, and after the cleaning is completed, the discharge port 20 is passed. Discharge the sewage; finally, enter the hot air drying system equipment, and complete the salt.

Claims

A movable continuous salt system, comprising: a salting tank system, a heating system, and a molten salt buffer system for transporting and transporting with a carrying system on a carrying system;

The salt tank system and the molten salt buffer system are connected by a molten salt pipeline; the heating system is disposed at the bottom of the salt tank system for heating the molten salt in the salt tank;

The salt tank system includes a salt tank; a top of the salt tank is provided with a feed port, a stirrer connection port and a thermometer connection port; and the agitator connection port is used for installing a stirrer to make the agitator The stirring component is located in the salting tank, and the control part of the agitator is located above the top of the salting tank; the thermometer connecting port is used for installing the thermometer, so that the detecting end of the thermometer is located in the salt bath, and the reading end is located above the top of the salt tank ;

a first communication port and a second communication port are respectively disposed on one side of the groove wall of the salt tank; the second communication port is disposed at a position close to the bottom of the salt bath;

The molten salt buffer system includes a buffer tank and a molten salt pump; a top of the buffer tank is provided with a molten salt pump connection port for sealingly connecting a molten salt pump, and the molten salt pump melts the buffer tank The molten salt is pumped into the molten salt tank;

a third communication port and a fourth communication port are respectively disposed above and below the tank wall of the buffer tank adjacent to the salt tank;

The duct communication means that the first communication port communicates with the third communication port through the first duct; the second communication port communicates with the fourth communication port through the second duct; and the third communication port has a low position in the connected state. In the first communication port, the position of the fourth communication port is lower than the second communication port; and the first pipe is provided with the first valve.
The movable continuous salt system according to claim 1, wherein a second valve is disposed at the inlet, and a first pressure relief valve is disposed at a top of the salt tank, the buffer tank There is a second pressure relief valve at the top.
The movable continuous salt system according to claim 1, wherein the agitator and the thermometer are respectively sealedly connected between the agitator connection port and the thermometer connection port and the top of the salt bath.
The movable continuous salt system according to claim 1, wherein the first communication port and the second communication port are provided with a sieve; preferably, the filter has a diameter of 20 to 200 μm.
The movable continuous salt system according to claim 1, wherein an inner bottom surface of the salt tank is a sloped surface, and an end adjacent to the buffer tank is lower than an opposite end; preferably, the The horizontal angle of the slope surface is 1 to 12 degrees.
The movable continuous salt system according to claim 1, wherein a top of the salt bath is further provided with a nitrogen port for connecting a nitrogen supply device; and/or a circulation port for lowering the injection temperature. Molten salt.
The movable continuous salt system according to claim 1, wherein the buffer tank is provided with a discharge port on a tank wall near the bottom, and the discharge port is externally connected to the discharge pipe, and the discharge pipe is provided with The third valve.
A mobile continuous salt system according to any one of claims 1 to 7, further comprising a charging system comprising a manual feeding station and/or an automatic mechanical feeding device.
The movable continuous salt system according to any one of claims 1 to 7, wherein the heating system comprises a casing, and a casing of the heating system is connected to the salting tank by a flange; The heating system includes an electric heater and/or a natural gas combustion chamber.
A method of continuous salt formation, characterized in that the movable continuous salt system according to any one of claims 1 to 9 comprises the following steps:

(1) initial stage of salt: a solid molten salt is charged into the salt bath; the stirrer is turned on, and the heating system is turned on to melt the molten salt;

(2) Continuous salt: the solid molten salt is continuously added to the salt tank. When the liquid molten salt level is higher than the first communication port, the molten salt will automatically flow into the buffer tank; when the molten salt level in the buffer tank When the set position is reached, the molten salt pump is turned on, and the liquid molten salt is pumped to the molten salt tank; the rate of addition of the solid molten salt and the pumping rate of the molten salt pump are controlled to make the liquid molten salt liquid in the salt bath It is always higher than the first communication port and the liquid molten salt level in the buffer tank is always higher than the minimum required liquid level of the molten salt pump, so that the salt is continuously performed.