WO2021248774A1 - 一种循环式硝酸钾结晶装置 - Google Patents

一种循环式硝酸钾结晶装置 Download PDF

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Publication number
WO2021248774A1
WO2021248774A1 PCT/CN2020/123678 CN2020123678W WO2021248774A1 WO 2021248774 A1 WO2021248774 A1 WO 2021248774A1 CN 2020123678 W CN2020123678 W CN 2020123678W WO 2021248774 A1 WO2021248774 A1 WO 2021248774A1
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Prior art keywords
circulating
pipe
cylinder
side wall
tube
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PCT/CN2020/123678
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English (en)
French (fr)
Inventor
赵晨
熊云生
田野
梁廷刚
李武平
孙红喜
赵遵闻
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金钾科技有限公司
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Publication of WO2021248774A1 publication Critical patent/WO2021248774A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/02—Crystallisation from solutions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D9/00—Nitrates of sodium, potassium or alkali metals in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D9/00—Nitrates of sodium, potassium or alkali metals in general
    • C01D9/18—Preparation in the form of shaped products, e.g. granules

Definitions

  • the invention relates to the technical field of potassium nitrate preparation, in particular to a circulating potassium nitrate crystallizer.
  • Potassium nitrate is a colorless transparent rhombic or rhombic crystal white powder, easily soluble in water, insoluble in ethanol, and not easy to deliquesce in the air. The product is a strong oxidant and can burn and explode in contact with organic matter. Potassium nitrate is widely used in the agricultural market. Potassium nitrate is a chlorine-free potassium and nitrogen compound fertilizer. The total content of phytonutrient potassium and nitrogen can reach about 60%, and it has good physical and chemical properties. Potassium nitrate applied to tobacco has high fertilizer efficiency, is easy to absorb, promotes the early emergence of seedlings, increases tobacco yield, and improves tobacco quality.
  • the Oslo evaporative crystallizer is a kind of mother liquor circulating continuous crystallizer.
  • the operating material liquid is added to the circulating tube, mixed with the circulating mother liquid in the tube, and sent to the heating chamber by the pump.
  • the heated solution evaporates in the evaporation chamber and reaches supersaturation, and enters the crystal fluidized bed below the evaporation chamber through the central tube.
  • the supersaturated solute in the solution deposits on the surface of the suspended particles, causing the crystals to grow.
  • the crystal fluidized bed performs hydraulic classification of the particles, with large particles on the bottom and small particles on the top, and the crystalline product with a relatively uniform particle size is discharged from the bottom of the fluidized bed.
  • the fine particles in the fluidized bed flow into the circulation pipe with the mother liquor, and the tiny crystals are dissolved when reheated. If the heating chamber of the Oslo evaporative crystallizer is replaced by a cooling chamber and the evaporative chamber and the like are removed, the Oslo cooling crystallizer is constructed.
  • the purpose of the present invention is to provide a circulating potassium nitrate crystallization device to solve the problem that the existing Oslo cooling crystallizer proposed in the background art is used for potassium nitrate crystallization, which easily blocks the discharge port and cannot discharge the material.
  • a circulating potassium nitrate crystallization device which is characterized in that it comprises a crystallizer cylinder, an overflow box, a circulating pipe, a first circulating pump, a heat exchanger, a central pipe, and a circulating flushing pipe.
  • the upper end of the crystallizer cylinder is open,
  • the crystallizer cylinder includes an upper cylindrical part, a conical part, a lower cylindrical part, and an arc-shaped cylinder bottom in sequence from top to bottom.
  • the arc-shaped cylinder bottom is provided with a discharge tube, and the center tube It is set in the middle of the mold cylinder and inserted straight into the upper end of the bottom of the arc-shaped cylinder from the upper end of the mold cylinder.
  • the lower end of the center tube is set as a conical tube whose diameter gradually expands downwards.
  • the overflow box is set in the mold On the outer side wall of the upper end of the cylinder, the inner cavity is communicated with the inner cavity of the crystallizer cylinder, and the bottom is provided with an overflow port.
  • the first circulation pump and the heat exchanger are both arranged on the outside of the crystallizer cylinder, and the circulation pipe is provided with multiple sections. , The overflow box, the first circulating pump, the heat exchanger, and the central pipe are connected in sequence.
  • the circulating punching pipe is provided with a number of pieces, which are evenly distributed around the outer wall of the mold cylinder.
  • the upper end of the circulating punching pipe The lower end of the circulation punch pipe is inserted into the lower cylindrical portion tangentially from the outer side wall of the lower cylindrical portion from the outer side wall of the middle portion of the cone portion and sealedly connected.
  • Circulating pump is used to pump out the mother liquor from the cone part, and then rush into the lower cylinder part from the tangential direction of the lower cylinder part, so that the mother liquor at the lower end of the mold cylinder produces a rotating vortex, which drives the flow of the crystal grains at the bottom of the arc-shaped cylinder to prevent discharge The tube is clogged.
  • the diameter of the circulating flushing pipe is set to 80-100 mm.
  • crystallizer cylinder overflow box, central pipe, circulation pipe, and circulation flushing pipe are all made of 316 stainless steel.
  • the heat exchanger adopts a tube-and-tube heat exchanger.
  • the discharging pipe is provided with two pieces, and they are arranged obliquely at an angle of 30 degrees to the horizontal plane.
  • first support rods uniformly distributed on the circumference
  • second support rods uniformly distributed on the circumference
  • the motor of the first circulating pump adopts an adjustable motor, and the flow rate of the first circulating pump is adjusted by adjusting the rotation speed of the motor, thereby adjusting the crystal grain size in the circulating mother liquor and the number of crystal grains discharged from the discharge pipe.
  • the present invention has the following beneficial effects: 1) adopting a mother liquor circulating continuous crystallization structure, so that potassium nitrate can be continuously and uninterruptedly crystallized and discharged, which greatly improves production efficiency; 2) adopting a plurality of uniformly distributed in a circle
  • the circulating flushing tube makes the crystal liquid at the bottom of the crystallizer rotate, which can effectively prevent the accumulation of crystal grains from clogging the discharge pipe and ensure smooth discharge; 3)
  • the bottom of the crystallizer cylinder is set to an arc-shaped cylinder bottom, which improves the liquid crystal
  • the flow state in the crystallizer prevents the formation of dead zones to accumulate crystal grains.
  • Figure 1 is a schematic structural diagram of an embodiment of the present invention
  • Figure 2 is a schematic top view of the structure of an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of the distribution structure of a multi-person circulation flushing pipe according to an embodiment of the present invention.
  • Mold cylinder 101, upper cylindrical part, 102, conical part, 103, lower cylindrical part, 104, arc-shaped cylinder bottom, 105, first support rod, 106, second support rod, 107 , Discharge pipe, 2, overflow box, 201, overflow port, 3, circulation pipe 1, 4, first circulation pump, 5, circulation pipe 2, 6, heat exchanger, 7, circulation pipe 3, 8. Central tube, 9, circulation flushing tube, 901, second circulation pump.
  • the embodiment of the present invention includes a crystallizer cylinder 1, an overflow box 2, a circulating pipe, a first circulating pump 4, a heat exchanger 6, a central pipe 8, and a circulating flushing pipe 9.
  • the upper end of the mold cylinder 1 is open for mother liquor.
  • the mold cylinder 1 includes an upper cylindrical portion 101, a cone portion 102, a lower cylindrical portion 103, an arc-shaped barrel bottom 104, and an arc-shaped barrel from top to bottom.
  • the bottom 104 is provided with a discharging tube 107, and the discharging tube 107 is provided with two pieces, which are inclined at an angle of 30 degrees with the horizontal plane.
  • the central tube 8 is set in the middle of the mold cylinder 1, and is inserted straight into the upper end of the arc-shaped cylinder bottom 104 from the upper end of the mold cylinder 1. Between the inner side wall of the part 101 and the outer side wall of the central tube 8 are provided a plurality of first support rods 105 uniformly distributed on the circumference. The pieces are second support rods 106 evenly distributed around the circumference.
  • the overflow box 2 is arranged on the outer side wall of the upper end of the crystallizer cylinder 1, the inner cavity is communicated with the inner cavity of the crystallizer cylinder 1, and an overflow port 201 is provided at the bottom.
  • the first circulating pump 4 and the heat exchanger 6 are both arranged on the outside of the crystallizer cylinder 1.
  • the heat exchanger 6 is a tubular heat exchanger with a water inlet at the upper end and a water outlet at the lower end.
  • the mother liquor flows from bottom to top in the tube, and the cold water flows from top to bottom on the outside of the tube, cold and hot convection, so that the mother liquid quickly cools down to the potassium nitrate saturated solution;
  • the motor of the first circulating pump 4 adopts an adjustable motor, and the motor is adjusted.
  • the rotation speed is used to adjust the flow rate of the first circulating pump 4, thereby adjusting the crystal grain size in the circulating mother liquor and the number of crystal grains discharged from the discharge pipe.
  • the circulation pipe is equipped with circulation pipe 1 3, circulation pipe 2 5, circulation pipe 3 7, overflow box 2, circulation pipe 1 3, first circulation pump 4, circulation pipe 2 5, heat exchanger 6, circulation pipe 3 7, and
  • the central pipes are connected in a sealed manner.
  • circulating punching pipes 9 arranged uniformly around the outer side wall of the mold cylinder 1.
  • the upper end of the circulating punching pipe 9 is radially inserted into the cone portion 102 from the outer side wall of the middle of the cone portion 102 and connected in a sealed manner.
  • the circulating punching pipe 9 The lower end is tangentially inserted into the lower cylindrical part 103 from the outer wall circumference of the lower part of the lower cylindrical part 103 and connected in a sealed manner.
  • the cylindrical part 103 punches into the lower cylindrical part 103 in a tangential direction, so that the mother liquor at the lower end of the mold cylinder 1 generates a swirling vortex, which drives the crystal grains at the bottom 104 of the arc-shaped cylinder to flow, preventing the crystal grains from clogging the discharge tube 107 and failing to discharge the material. .
  • the diameter of the circulating punch 9 is set to 80-100 mm.
  • the mold cylinder 1, the overflow box 2, the central pipe 8, the circulating pipe one 3, the circulating pipe two 5, the circulating pipe three 7, and the circulating punching pipe 9 are all made of 316 stainless steel.
  • the working mode of the present invention the mother liquor of 80 degrees is continuously added into the crystallizer cylinder 1, when the liquid level of the mother liquor exceeds the height of the overflow at the bottom of the overflow tank 2, the mother liquor will flow into the circulation pipe 3 from the overflow and start In the first circulation pump 4, the mother liquor enters the heat exchanger 6, and the mother liquor from the heat exchanger 6 is cooled to below 35 degrees, and then enters the central pipe 8, where potassium nitrate crystals are precipitated in the central pipe, and finally from the cone at the lower end of the central pipe 8.
  • the nozzle of the shaped pipe flows into the bottom of the arc-shaped cylinder and discharges the material from the discharge port.
  • a plurality of second circulating pumps 901 are activated to make the mother liquor in the cone part 102 enter the lower cylinder tangentially from the circumference of the lower cylindrical part 103 through the circulating punching pipe.
  • the lower end of the crystallizer cylinder 1 causes the mother liquor to generate a swirling vortex, which drives the crystal grains at the bottom 104 of the arc-shaped cylinder to flow, thereby preventing the crystal grains from clogging the discharge pipe 107 and ensuring smooth discharge.

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Abstract

一种循环式硝酸钾结晶装置，包括结晶器筒体（1）、溢流箱（2）、循环管（3，5，7）、第一循环泵（4）、热交换器（6）、中心管（8）、循环冲管（9），中心管（8）设于结晶器筒体（1）中间，溢流箱（2）设于结晶器筒体（1）上端外侧壁上，循环管（3，5，7）依次将溢流箱（2）、第一循环泵（4）、热交换器（6）、中心管（8）密封连接，循环冲管（9）设有若干件，围绕结晶器筒体（1）外侧壁呈圆周均布设置，循环冲管（9）上端从圆锥部（102）中部外侧壁径向***圆锥部（102）内并密封连接，循环冲管（9）下端从下圆柱部（103）下部外侧壁圆周切向***下圆柱部（103）内并密封连接，循环冲管（9）的中间设有第二循环泵（901）。采用母液循环连续结晶结构，大大提高了生产效率；采用多个呈圆周均布的循环冲管（9）使结晶器底部晶液产生旋转运动，可有效防止晶粒堆积堵塞出料管，保证出料顺畅。

Description

一种循环式硝酸钾结晶装置 技术领域
本发明涉及硝酸钾制备技术领域，特别涉及一种循环式硝酸钾结晶装置。
背景技术
硝酸钾为无色透明斜方或菱形晶体白色粉末，易溶于水，不溶于乙醇，在空气中不易潮解，该产品为强氧化剂，与有机物接触能燃烧***。硝酸钾在农业市场用途十分广泛，硝酸钾是无氯钾、氮复合肥料，植物营养素钾、氮的总含量可达60％左右，具有良好的物理化学性质。硝酸钾施用于烟草具有肥效高，易吸收，促进幼苗早发，增加烟草产量，提高烟草品质的重要作用。在食品工业用作发色剂，护色剂，抗微生物剂，防腐剂，它在肉制品中由于细菌作用而还原成亚硝酸钾而起护色和抑菌的作用，如用于腌肉，在午餐肉中起防腐作用。在医药工业用于生产青霉素钾盐，利福平等药物。
硝酸钾在制备过程中多采用单釜轮流顺序结晶，属于间歇结晶方式，设备的传热效率低，占用数量多，投资大，生产效率低，产品粒径控制困难。
奥斯陆蒸发结晶器是一种母液循环式连续结晶器，操作的料液加到循环管中，与管内循环母液混合，由泵送至加热室。加热后的溶液在蒸发室中蒸发并达到过饱和，经中心管进入蒸发室下方的晶体流化床。在晶体流化床内，溶液中过饱和的溶质沉积在悬浮颗粒表面,使晶体长大。晶体流化床对颗粒进行水力分级,大颗粒在下，而小颗粒在上，从流化床底部卸出粒度较为均匀的结晶产品。流化床中的细小颗粒随母液流入循环管，重新加热时溶去其中的微小晶体。若以冷却室代替奥斯陆蒸发结晶器的加热室并除去蒸发室等，则构成奥斯陆冷却结晶器。
但奥斯陆这种循环冷却结晶器用于硝酸钾结晶时，因为硝酸钾溶液在结晶器内部容易发生沉淀，使得硝酸钾结晶后不均匀，且硝酸钾冷却结晶速度快，结晶后很容易堵塞出料口，无法出料。
发明内容
本发明的目的在于提供一种循环式硝酸钾结晶装置，以解决上述背景技术中提出的现有奥斯陆冷却结晶器用于硝酸钾结晶时容易堵塞出料口，无法出料的问题。
为实现上述目的，本发明提供如下技术方案：
一种循环式硝酸钾结晶装置，其特征在于包括结晶器筒体、溢流箱、循环管、第一循环泵、热交换器、中心管、循环冲管，所述结晶器筒体上端开口，用于母液加入，该结晶器筒体从上往下依次包括上圆柱部、圆锥部、下圆柱部、圆弧形筒底部，所述圆弧形筒底部设有出料管，所述中心管设于结晶器筒体中间，从结晶器筒体上端直***圆弧形筒底部上端，该中心管下端部设为管径朝下逐步扩大的圆锥形管，所述溢流箱设于结晶器筒体上端外侧壁上，内腔与结晶器筒体内腔相通，底部设有溢流口，所述第一循环泵和热交换器均设于结晶器筒体外侧，所述循环管设有多段，依次将溢流箱、第一循环泵、热交换器、中心管密封连接，所述循环冲管设有若干件，围绕结晶器筒体外侧壁呈圆周均布设置，所述循环冲管上端从圆锥部中部外侧壁径向***圆锥部内并密封连接，所述循环冲管下端从下圆柱部下部外侧壁圆周切向***下圆柱部内并密封连接，所述循环冲管的中间设有第二循环泵，用于将圆锥部内母液抽出，再从下圆柱部的切向冲入下圆柱部内，使得结晶器筒体下端母液产生旋转漩涡，带动圆弧形筒底部的晶粒流动，防止出料管堵塞。
进一步的，所述循环冲管设有8件。
进一步的，所述循环冲管管径设为80～100mm。
进一步的，所述结晶器筒体、溢流箱、中心管、循环管、循环冲管均采用316不锈钢材质。
进一步的，所述热交换器采用列管式热交换器。
进一步的，所述出料管设有两件，且与水平面呈30度角倾斜设置。
进一步的，所述上圆柱部内侧壁与中心管外侧壁之间设有多件呈圆周均布的第一支撑杆，所述圆弧形筒底部内侧壁与中心管下端圆锥形管外侧壁之间设有多件呈圆周均布的第二支撑杆。
进一步的，所述第一循环泵的电机采用可调电机，通过调节电机转速来调节第一循环泵流量，从而调节循环母液中结晶粒径和出料管的晶粒出料数量。
与现有技术相比，本发明的有益效果为：1)采用母液循环连续结晶结构，使硝酸钾可以连续不间断结晶、出料，大大提高了生产效率；2)采用多个呈圆周均布的循环冲管使结晶器底部晶液产生旋转运动，可有效防止晶粒堆积堵塞出料管，保证出料顺畅；3)结晶器筒体底部设为圆弧形筒底，改善了晶液在结晶器内的流动状态，防止形成死区堆积晶粒。
附图说明
图1为本发明实施例结构示意图；
图2为本发明实施例俯视结构示意图；
图3为本发明实施例多人循环冲管分布结构示意图；
图中：1、结晶器筒体，101、上圆柱部，102、圆锥部，103、下圆柱部，104、圆弧形筒底部，105、第一支撑杆，106、第二支撑杆，107、出料管，2、溢流箱，201、溢流口，3、循环管一，4、第一循环泵，5、循环管二，6、热交换器，7、循环管三，8、中心管，9、循环冲管，901、第二循环泵。
具体实施方式
在本发明的描述中，需要理解的是，术语“上”、“下”、“前”、“后”、“左”、“右”、“顶”、“底”、“内”、“外”、“竖直”、“水平”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
下面将结合本发明实施例中的附图，对本发明例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。
如图1至3所示，本发明实施例包括结晶器筒体1、溢流箱2、循环管、第一循环泵4、热交换器6、中心管8、循环冲管9。
结晶器筒体1上端开口，用于母液加入，该结晶器筒体1从上往下依次包括上圆柱部101、圆锥部102、下圆柱部103、圆弧形筒底部104，圆弧形筒底部104设有出料管107，出料管107设有两件，且与水平面呈30度角倾斜设置。
中心管8设于结晶器筒体1中间，从结晶器筒体1上端直***圆弧形筒底部104上端，该中心管8下端部设为管径朝下逐步扩大的圆锥形管，上圆柱部101内侧壁与中心管8外侧壁之间设有多件呈圆周均布的第一支撑杆105，圆弧形筒底部104内侧壁与 中心管8下端圆锥形管外侧壁之间设有多件呈圆周均布的第二支撑杆106。
溢流箱2设于结晶器筒体1上端外侧壁上，内腔与结晶器筒体1内腔相通，底部设有溢流口201。
第一循环泵4和热交换器6均设于结晶器筒体1外侧，热交换器6采用列管式热交换器，上端设有进水口，下端设有出水口，在该热交换器内母液在列管内从下往上流动，冷水在列管外侧从上往下流动，冷热对流，使母液快速降温达到硝酸钾饱和溶液；第一循环泵4的电机采用可调电机，通过调节电机转速来调节第一循环泵4流量，从而调节循环母液中结晶粒径和出料管的晶粒出料数量。
循环管设有循环管一3、循环管二5、循环管三7，溢流箱2、循环管一3、第一循环泵4、循环管二5、热交换器6、循环管三7、中心管依次密封连接。
循环冲管9设有8件，围绕结晶器筒体1外侧壁呈圆周均布设置，循环冲管9上端从圆锥部102中部外侧壁径向***圆锥部102内并密封连接，循环冲管9下端从下圆柱部103下部外侧壁圆周切向***下圆柱部103内并密封连接，循环冲管9的中间还设有第二循环泵901，用于将圆锥部102内母液抽出，再从下圆柱部103的切向冲入下圆柱部103内，使得结晶器筒体1下端母液产生旋转漩涡，带动圆弧形筒底部104的晶粒流动，防止晶粒堵塞出料管107，无法出料。
作为优选，循环冲管9管径设为80～100mm。
作为优选，结晶器筒体1、溢流箱2、中心管8、循环管一3、循环管二5、循环管三7、循环冲管9均采用316不锈钢材质。
本发明的工作方式：将80度的母液持续不断加入结晶器筒体1内，当母液液 面超过溢流箱2底部溢流口高度时，母液会从溢流口流入循环管一3，启动第一循环泵4，母液进入热交换器6，从热交换器6出来的母液降温至35度以下，再进入中心管8，在中心管内析出硝酸钾晶料，最后从中心管8下端的圆锥形管管口流入圆弧形筒底部，并从出料口出料，启动多个第二循环泵901，使圆锥部102内的母液通过循环冲管从下圆柱部103圆周切向进入下圆柱部，使得结晶器筒体1下端母液产生旋转漩涡，带动圆弧形筒底部104的晶粒流动，从而防止晶粒堵塞出料管107，保证顺利出料。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。

Claims (8)

  1. 一种循环式硝酸钾结晶装置，其特征在于包括结晶器筒体、溢流箱、循环管、第一循环泵、热交换器、中心管、循环冲管，所述结晶器筒体上端开口，用于母液加入，该结晶器筒体从上往下依次包括上圆柱部、圆锥部、下圆柱部、圆弧形筒底部，所述圆弧形筒底部设有出料管，所述中心管设于结晶器筒体中间，从结晶器筒体上端直***圆弧形筒底部上端，该中心管下端部设为管径朝下逐步扩大的圆锥形管，所述溢流箱设于结晶器筒体上端外侧壁上，内腔与结晶器筒体内腔相通，底部设有溢流口，所述第一循环泵和热交换器均设于结晶器筒体外侧，所述循环管设有多段，依次将溢流箱、第一循环泵、热交换器、中心管密封连接，所述循环冲管设有若干件，围绕结晶器筒体外侧壁呈圆周均布设置，所述循环冲管上端从圆锥部中部外侧壁径向***圆锥部内并密封连接，所述循环冲管下端从下圆柱部下部外侧壁圆周切向***下圆柱部内并密封连接，所述循环冲管的中间设有第二循环泵，用于将圆锥部内母液抽出，再从下圆柱部的切向冲入下圆柱部内，使得结晶器筒体下端母液产生旋转漩涡，带动圆弧形筒底部的晶粒流动，防止出料管堵塞。
  2. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述循环冲管设有8件。
  3. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述循环冲管管径设为80～100mm。
  4. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述结晶器筒体、溢流箱、中心管、循环管、循环冲管均采用316不锈钢材质。
  5. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述热交换器采用列管式热交换器。
  6. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述出料管设有两件，且与水平面呈30度角倾斜设置。
  7. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述上圆柱部内侧壁与中心管外侧壁之间设有多件呈圆周均布的第一支撑杆，所述圆弧形筒底部内侧壁与中心管下端圆锥形管外侧壁之间设有多件呈圆周均布的第二支撑杆。
  8. 根据权利要求1所述的一种循环式硝酸钾结晶装置，其特征在于：所述第一循环泵的电机采用可调电机，通过调节电机转速来调节第一循环泵流量，从而调节循环母液中结晶粒径和出料管的晶粒出料数量。
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