Crystal potassium formate preparation system

Abstract

The utility model provides a crystal potassium formate preparation system which comprises a preheating tank, a falling film evaporator, a finished product heating device, a steam channel, a rotary drum pelleter and a cooling device, the preheating tank is used for preheating a potassium formate concentrated solution, and the falling film evaporator is used for evaporating moisture in the potassium formate concentrated solution; the finished product heating device is used for heating the potassium formate concentrated solution to obtain molten potassium formate liquid and water vapor, the steam channel is used for conveying the water vapor to the preheating tank and the falling film evaporator, the rotary drum pelleter is used for solidifying the molten potassium formate liquid into flaky potassium formate crystals, and the cooling device is used for cooling the flaky potassium formate crystals. The system for preparing crystal potassium formate is high in working efficiency, and prepared crystals are dry, not prone to caking and good in quality.

Description

Technical Field

[0001] The utility model relates to the technical field of potassium formate preparation, in particular to a crystal potassium formate preparation system. Background Art

[0002] Potassium formate is an organic salt with the chemical formula HCOOK. It is a white solid that is very hygroscopic, has reducing properties, can react with strong oxidants, is easily soluble in water, and its aqueous solution is a colorless and transparent liquid. Industrial potassium formate is mainly used as drilling fluid and well-killing fluid in oil fields due to its high saturated density of aqueous solution.

[0003] The industrial potassium formate products currently produced in China generally use natural sedimentation purification or filter cloth filter press purification devices after synthesis. The product purity is not high, it is opaque after dissolving in water, the turbidity is high, and the quality is greatly affected by the fluctuation of raw materials and is unstable. Some manufacturers use spray drying to obtain potassium formate solids, but the effect is poor during the drying process, making potassium formate prone to condensation and agglomeration, thus affecting the quality and use of potassium formate crystals. Utility Model Content

[0004] In order to solve the problems existing in the prior art, the utility model provides a system for preparing crystalline potassium formate.

[0005] According to a first aspect of the utility model, a system for preparing crystalline potassium formate is provided, comprising:

[0006] A preheating tank, which is used to preheat the potassium formate concentrate;

[0007] A falling film evaporator, the falling film evaporator is connected to the preheating tank, and the falling film evaporator is used to evaporate the water in the potassium formate concentrate preheated by the preheating tank;

[0008] A finished product heating device, the finished product heating device is connected to the falling film evaporator, and the finished product heating device is used to heat the potassium formate concentrate treated by the falling film evaporator to obtain molten potassium formate liquid and water vapor;

[0009] A steam channel, the steam channel is connected to the finished product heating device, and the steam channel is used to transport the water vapor output by the finished product heating device to the preheating tank and the falling film evaporator;

[0010] A rotary drum tablet making machine, the rotary drum tablet making machine is connected to the finished product heating device, and the rotary drum tablet making machine is used to solidify the molten potassium formate liquid into potassium formate crystals;

[0011] A cooling device is connected to the rotary drum tablet making machine, and the cooling device is used to cool the potassium formate crystals.

[0012] In one embodiment of the present invention, the preheating tank is used to heat the potassium formate concentrate to above 80°C.

[0013] In one embodiment of the present invention, the falling film evaporator is used to heat the potassium formate concentrate to above 160°C.

[0014] In one embodiment of the utility model, the finished product heating device includes a heating container and an electric heater, wherein the heating container has a feed inlet for entering potassium formate concentrate, a discharge port for outputting molten potassium formate liquid, and a steam outlet for outputting water vapor.

[0015] In one embodiment of the present invention, a steam injector is provided on the steam channel.

[0016] In one embodiment of the utility model, it also includes a screening device arranged below the cooling device and a finished product silo arranged below the screening device, wherein the screening device is used to screen out agglomerates in the potassium formate crystals cooled by the cooling device, and the finished product silo is used to receive the potassium formate crystals screened by the screening device.

[0017] A beneficial effect of the utility model is that the potassium formate concentrated liquid is processed by a preheating tank, a falling film evaporator, a finished product heating device, a rotary drum tablet making machine and a cooling device in sequence; the preheating tank preheats the potassium formate concentrated liquid, which is beneficial to improving the heating efficiency; the two-stage heating by the falling film evaporator and the finished product heating device can fully remove moisture to obtain molten potassium formate liquid and water vapor; the water vapor can be transported to the preheating tank and the falling film evaporator through a steam channel for heat recovery and utilization; the rotary drum tablet making machine solidifies the molten potassium formate liquid into potassium formate crystals, and then cools the molten potassium formate crystals through the cooling device; the system has high working efficiency in preparing crystalline potassium formate, and the crystals are dry, not easy to agglomerate, and have good quality.

[0018] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0020] Figure 1 The utility model is a schematic diagram of the overall structure of a system for preparing crystalline potassium formate.

[0021] In the figure:

[0022] 1. Preheating tank; 2. Falling film evaporator; 3. Finished product heating device; 4. Steam channel; 5. Steam ejector; 6. Rotary drum tablet making machine; 7. Cooling device; 8. Screening device; 9. Finished product silo. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0024] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0025] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0026] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0027] In this document, unless otherwise specified, "plurality" means two or more. Unless otherwise specified, the numerical ranges herein include not only the entire ranges within the two endpoints thereof, but also several sub-ranges contained therein.

[0028] Figure 1 The utility model shows a crystalline potassium formate preparation system, which includes a preheating tank 1, a falling film evaporator 2, a finished product heating device 3, a steam channel 4, a rotary drum tablet making machine 6 and a cooling device 7.

[0029] The preheating tank 1 is used to preheat the potassium formate concentrate, and the falling film evaporator 2 is connected to the preheating tank 1. The falling film evaporator 2 is used to evaporate the water in the potassium formate concentrate preheated by the preheating tank 1. The potassium formate concentrate is preheated by the preheating tank 1, which is beneficial to improving the working efficiency of the falling film evaporator 2. The falling film evaporator 2 can further heat the potassium formate concentrate and evaporate most of the water.

[0030] The finished product heating device 3 is connected to the falling film evaporator 2, and the finished product heating device 3 is used to heat the potassium formate concentrate treated by the falling film evaporator 2 to obtain molten potassium formate liquid and water vapor.

[0031] The melting point of potassium formate is 165-168° C. The finished product heating device 3 can heat the potassium formate concentrate to, for example, 200-230° C., which can more fully evaporate the residual water and fully melt the potassium formate.

[0032] After two-stage heating treatment in the falling film evaporator 2 and the finished product heating device 3, the water content in the molten potassium formate liquid can be reduced to less than 1%.

[0033] The steam channel 4 is connected to the finished product heating device 3. The steam channel 4 is used to transport the water vapor output by the finished product heating device 3 to the preheating tank 1 and the falling film evaporator 2, so as to recycle the heat in the water vapor. The heat in the water vapor can be transferred to the preheating tank 1 and the falling film evaporator 2 to heat the potassium formate concentrate, thereby saving energy consumption.

[0034] The rotary drum tablet making machine 6 is connected to the finished product heating device 3, and is used to solidify the molten potassium formate liquid produced by the finished product heating device 3 into flaky potassium formate crystals.

[0035] The cooling device 7 is connected to the rotary drum tablet making machine 6 , and the cooling device 7 is used to cool the potassium formate crystals produced by the rotary drum tablet making machine 6 .

[0036] Specifically, the preheating tank 1 is provided with a feed inlet and a discharge port, and the potassium formate concentrate enters the preheating tank 1 from the feed inlet and exits the preheating tank 1 from the discharge port. The falling film evaporator 2 is provided with a feed inlet and a discharge port, and the feed inlet of the falling film evaporator 2 is connected to the discharge port of the preheating tank 1 through a pipeline. The potassium formate concentrate preheated by the preheating tank 1 enters the falling film evaporator 2.

[0037] The preheating tank 1 is also provided with a steam inlet and a steam outlet. The steam channel 4 delivers water vapor into the steam inlet of the preheating tank 1. The water vapor exchanges heat with the potassium formate concentrate in the preheating tank 1 to increase the temperature of the potassium formate concentrate, and then is discharged from the steam outlet of the preheating tank 1.

[0038] In order to better exert the preheating effect of the preheating tank 1, the preheating tank 1 is used to heat the potassium formate concentrate to above 80°C.

[0039] The falling film evaporator 2 is also provided with a steam inlet and a steam outlet. The steam inlet of the falling film evaporator 2 is connected to the steam outlet of the preheating tank 1 through a pipeline. The water vapor enters the falling film evaporator 2 from the preheating tank 1 to continue heating the potassium formate concentrate, making full use of the heat of the water vapor.

[0040] In order to fully remove the water in the potassium formate concentrate, the falling film evaporator 2 is used to heat the potassium formate concentrate to above 160°C.

[0041] The finished product heating device 3 includes a heating container and an electric heater, wherein the heating container has a feed port for entering the potassium formate concentrate, a discharge port for outputting the molten potassium formate liquid, and a steam outlet for outputting water vapor. The electric heater heats the potassium formate in the heating container to 200-230° C. by electric energy. The feed port of the heating container is connected to the discharge port of the falling film evaporator 2 through a pipeline, and the steam channel 4 is connected to the steam outlet on the heating container of the finished product heating device 3. The discharge port of the heating container is connected to the rotary drum tablet making machine 6 through a pipeline, and the molten potassium formate liquid is transported to the rotary drum tablet making machine 6.

[0042] Furthermore, a steam ejector 5 may be provided on the steam channel 4. The steam ejector 5 can be used for exhaust steam and waste heat recovery, and the steam ejector 5 can deliver the water vapor in the steam channel 4 to the preheating tank 1 and the falling film evaporator 2.

[0043] The preheating tank 1, the falling film evaporator 2 and the finished product heating device 3 are connected in sequence through pipelines for conveying liquids. Control valves can be provided on each liquid pipeline and the steam channel 4 to control opening and closing and flow rate.

[0044] The trough of the drum tablet machine 6 is connected to the discharge port of the finished product heating device 3, and the molten potassium formate liquid produced by the finished product heating device 3 is transported to the trough of the drum tablet machine 6. The trough of the drum tablet machine 6 is provided with an auxiliary heater, which can heat the molten potassium formate liquid in the trough to prevent the molten potassium formate liquid from agglomerating and absorbing moisture in an open environment.

[0045] The rotary drum tablet making machine 6 cools down the molten potassium formate liquid to solidify it. The molten potassium formate liquid can be hung on the rotary drum of the rotary drum tablet making machine 6 to form flaky crystals to obtain potassium formate crystals with a purity of ≥96.5%. The obtained potassium formate crystals are drier, less prone to agglomeration, easy to store, and convenient for storage and transportation.

[0046] The potassium formate crystals produced by the rotary drum tablet making machine 6 have a high temperature, and the potassium formate crystals are cooled down by the cooling device 7. The cooling device 7 can be a drum cooler, and the outer wall of the drum cooler is cooled by circulating water to cool the potassium formate crystals to room temperature.

[0047] Furthermore, the crystalline potassium formate preparation system also includes a screening device 8 and a finished product silo 9.

[0048] The screening device 8 is arranged below the cooling device 7, and the finished product silo 9 is arranged below the screening device 8. The screening device 8 is used to screen out the agglomerates in the potassium formate crystals cooled by the cooling device 7 to obtain high-purity potassium formate crystals; the finished product silo 9 is used to receive the high-purity potassium formate crystals screened by the screening device 8.

[0049] The drum tablet making machine 6, the cooling device 7, the screening device 8 and the finished product silo 9 can be arranged in sequence from high to low. The potassium formate crystals made by the drum tablet making machine 6 fall into the cooling device 7 below, the potassium formate crystals cooled by the cooling device 7 fall into the screening device 8 below, and the potassium formate crystals screened by the screening device 8 fall into the finished product silo 9 below.

[0050] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A system for preparing crystalline potassium formate, characterized in that: include: A preheating tank, which is used to preheat the potassium formate concentrate; A falling film evaporator, the falling film evaporator is connected to the preheating tank, and the falling film evaporator is used to evaporate the water in the potassium formate concentrate preheated by the preheating tank; A finished product heating device, the finished product heating device is connected to the falling film evaporator, and the finished product heating device is used to heat the potassium formate concentrate treated by the falling film evaporator to obtain molten potassium formate liquid and water vapor; A steam channel, the steam channel is connected to the finished product heating device, and the steam channel is used to transport the water vapor output by the finished product heating device to the preheating tank and the falling film evaporator; A rotary drum tablet making machine, the rotary drum tablet making machine is connected to the finished product heating device, and the rotary drum tablet making machine is used to solidify the molten potassium formate liquid into potassium formate crystals; A cooling device is connected to the rotary drum tablet making machine, and the cooling device is used to cool the potassium formate crystals.

2. The system for preparing crystalline potassium formate according to claim 1, characterized in that: The preheating tank is used to heat the potassium formate concentrate to above 80°C.

3. The system for preparing crystalline potassium formate according to claim 1, characterized in that: The falling film evaporator is used to heat the potassium formate concentrate to above 160°C.

4. The system for preparing crystalline potassium formate according to claim 1, characterized in that: The finished product heating device comprises a heating container and an electric heater. The heating container has a feed inlet for potassium formate concentrate, a discharge port for outputting molten potassium formate liquid, and a steam outlet for outputting water vapor.

5. The system for preparing crystalline potassium formate according to claim 1, characterized in that: A steam ejector is arranged on the steam channel.

6. The system for preparing crystalline potassium formate according to any one of claims 1 to 5, characterized in that: It also includes a screening device arranged below the cooling device and a finished product silo arranged below the screening device, wherein the screening device is used to screen out agglomerates in the potassium formate crystals cooled by the cooling device, and the finished product silo is used to receive the potassium formate crystals screened by the screening device.

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