WO2021248775A1 - 一种内设加速管的硝酸钾结晶器 - Google Patents

一种内设加速管的硝酸钾结晶器 Download PDF

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Publication number
WO2021248775A1
WO2021248775A1 PCT/CN2020/123679 CN2020123679W WO2021248775A1 WO 2021248775 A1 WO2021248775 A1 WO 2021248775A1 CN 2020123679 W CN2020123679 W CN 2020123679W WO 2021248775 A1 WO2021248775 A1 WO 2021248775A1
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Prior art keywords
tube
crystallizer
cylinder
potassium nitrate
central tube
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PCT/CN2020/123679
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English (en)
French (fr)
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赵家春
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 WO2021248775A1 publication Critical patent/WO2021248775A1/zh

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    • 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
    • C01D9/04—Preparation with liquid nitric acid
    • 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
    • C01D9/16—Purification

Definitions

  • the invention relates to the technical field of potassium nitrate preparation, in particular to a potassium nitrate crystallizer equipped with an accelerating tube.
  • 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 pipe, mixed with the circulating mother liquor in the pipe, and then pumped to the heating chamber.
  • 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 carries out hydraulic classification of the particles, with large particles on the bottom and small particles on the top. Crystal products with a relatively uniform particle size are 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 fine 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 potassium nitrate crystallizer equipped with an accelerating tube, so as 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 potassium nitrate crystallizer with built-in acceleration tube 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 tube, and an acceleration tube.
  • the upper end of the crystallizer cylinder The opening is used to add mother liquor. It includes an upper cylindrical part, a conical part, a lower cylindrical part, and the bottom of an arc-shaped cylinder from top to bottom. In the middle of the crystallizer cylinder, the upper end of the crystallizer cylinder is inserted straight into the upper end of the bottom of the arc-shaped cylinder.
  • the lower end of the central tube is set as a conical tube whose diameter gradually expands downwards.
  • the overflow box is arranged at the upper end of the crystallizer cylinder.
  • the inner cavity communicates 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.
  • the overflow box, the first circulating pump, the heat exchanger, and the central tube are connected in a sealed manner.
  • the accelerating tube is provided with a number of pieces, which are evenly distributed around the outer side wall of the central tube.
  • the lower end of the accelerating tube is arranged in a conical shape at the lower end of the central tube.
  • the inside communicates with the inside of the central tube, the upper end is arranged in the upper cylindrical part, and the end is bent radially outwards.
  • the end of the accelerating tube elbow is provided with a vertical axial flow pump.
  • the liquid outlet of the axial flow pump is in a sealed connection with the end of the elbow of the acceleration tube.
  • the suction chamber at the lower end of the vertical axial flow pump is arranged in the cone part.
  • the vertical axial flow pump is used to pump the mother liquid in the cone part into the central tube through the acceleration tube
  • the lower end accelerates the flow of crystal grains at the bottom of the arc-shaped cylinder at the lower end of the central pipe to prevent the discharge pipe from being blocked.
  • first support rods uniformly distributed on the circumference
  • second support rods uniformly distributed on the circumference
  • the vertical axial flow pump is fixedly connected to the first support rod.
  • the accelerating tube is provided with 4 pieces.
  • the diameter of the accelerating tube is set to 80-90 mm.
  • crystallizer cylinder overflow box, central tube, circulation tube, and acceleration tube are all made of 316 stainless steel.
  • the heat exchanger adopts a tubular 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.
  • 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 accelerating tube accelerates the movement of the crystal liquid at the bottom of the crystallizer, which can effectively prevent the accumulation of crystal grains from clogging the discharge tube and ensure smooth discharge; 3)
  • the bottom of the crystallizer cylinder is set at the arc-shaped cylinder bottom, which improves the crystal liquid in the crystallizer.
  • the internal flow state prevents the formation of dead zone accumulation of grains.
  • Figure 1 is a schematic structural diagram of an embodiment of the present invention
  • Fig. 2 is a schematic top view of the structure of 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, acceleration tube, 10, axial flow pump.
  • the embodiment of the present invention includes a crystallizer cylinder 1, an overflow box 2, a circulation pipe, a first circulation pump 4, a heat exchanger 6, a central pipe 8, and an acceleration pipe 9.
  • the upper end of the crystallizer cylinder 1 is open for mother liquor to be added. It includes an upper cylindrical part 101, a conical part 102, a lower cylindrical part 103, and an arc-shaped cylinder bottom 104 from top to bottom.
  • the arc-shaped cylinder bottom 104 is provided with discharge
  • the pipe 107 and the discharging pipe 107 are provided with two pieces, and they are arranged obliquely 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 pipe 8 is connected in a sealed manner.
  • the acceleration tube 9 is provided with 4 pieces, which are uniformly distributed around the outer side wall of the center tube 8.
  • the lower end of the acceleration tube 9 is set on the outer side wall of the conical tube at the lower end of the center tube 8, and the interior communicates with the center tube 8, and the upper end is set on the upper cylinder. In the part 101, the end is bent radially outwards.
  • the end of the elbow of the acceleration tube 9 is equipped with a vertical axial flow pump 10.
  • the outlet of the vertical axial flow pump 10 is sealed with the end of the elbow of the acceleration tube 9 Connected, the suction chamber at the lower end of the vertical axial flow pump 10 is set in the cone portion 102.
  • the vertical axial flow pump 10 is used to pump the mother liquid in the cone portion 102 into the lower end of the central pipe 8 through the acceleration pipe 9 to accelerate the lower end of the central pipe 8.
  • the crystal grains at the bottom 104 of the arc-shaped cylinder flow to prevent the discharge pipe 107 from being blocked.
  • the diameter of the acceleration tube 9 is set to 80 mm.
  • the mold cylinder 1, the overflow box 2, the central pipe 8, the circulation pipe one 3, the circulation pipe two 5, the circulation pipe three 7, and the acceleration 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
  • 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 8, and finally from the lower end of the central pipe 8.
  • the mouth of the conical tube flows into the bottom 104 of the arc-shaped cylinder and discharges from the discharge port 107.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

本发明公开了一种内设加速管的硝酸钾结晶器，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、加速管，中心管设于结晶器筒体中间，溢流箱设于结晶器筒体上端外侧壁上，循环管依次将溢流箱、第一循环泵、热交换器、中心管密封连接，加速管设有若干件，围绕中心管外侧壁呈圆周均布设置，加速管下端设于中心管下端圆锥形管外侧壁上，内部与中心管内部相通，上端设于上圆柱部内，端部沿径向朝外折弯，加速管弯头端部均设有立式轴流泵，该立式轴流泵下端吸入室设于圆锥部。本发明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加速管使结晶器底部晶液加速运动，可有效防止晶粒堆积堵塞出料管。

Description

一种内设加速管的硝酸钾结晶器 技术领域
本发明涉及硝酸钾制备技术领域，特别涉及一种内设加速管的硝酸钾结晶器。
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，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内设加速管的硝酸钾结晶器，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：
一种内设加速管的硝酸钾结晶器，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、加速管，所述结晶器筒体上端开口，用于母液加入，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，所述加速管设有若干件，围绕中心管外侧壁呈圆周均布设置，所述加速管下端设于中心管下端圆锥形管外侧壁上，内部与中心管内部相通，上端设于上圆柱部内，端部沿径向朝外折弯，所述加速管弯头端部均设有立式轴流泵，所述立式轴流泵出液口与加速管弯头端部密封连接，该立式轴流泵下端吸入室设于圆锥部，所述立式轴流泵用于将圆锥部内母液通过加速管泵入中心管下端部，加速中心管下端圆弧形筒底部的晶粒流动，防止出料管堵塞。
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，所述立式轴流泵固定连接于第一支撑杆上。
进一步的，所述加速管设有4件。
进一步的，所述加速管管径设为80～90mm。
进一步的，所述结晶器筒体、溢流箱、中心管、循环管、加速管均采用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加速管使结晶器底部晶液加速运动，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、加速管，10、轴流泵。
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，对本发明实施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、2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、加速管9。
结晶器筒体1上端开口，用于母液加入，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8依次密封连接。
加速管9设有4件，围绕中心管8外侧壁呈圆周均布设置，加速管9下端设于中心管8下端圆锥形管外侧壁上，内部与中心管8内部相通，上端设于上圆柱部101内，端部沿径向朝外折弯，加速管9弯头端部均设有立式轴流泵10，该立式轴流泵10出液口与加速管9弯头端部密封连接，立式轴流泵10下端吸入室设于圆锥部102内，立式轴流泵10用于将圆锥部102内母液通过加速管9泵入中心管8下端部，加速中心管8下端圆弧形筒底部104的晶粒流动，防止出料管107堵塞。
作为优选，加速管9管径设为80mm。
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、加速管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8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104，并从出料口107出料，启动4个轴流泵10，将圆锥部102内的母液通过加速管9泵入中心管8下端，加速了中心管8下端圆弧形筒底部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 (9)

  1. 一种内设加速管的硝酸钾结晶器，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、加速管，所述结晶器筒体上端开口，用于母液加入，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，所述加速管设有若干件，围绕中心管外侧壁呈圆周均布设置，所述加速管下端设于中心管下端圆锥形管外侧壁上，内部与中心管内部相通，上端设于上圆柱部内，端部沿径向朝外折弯，所述加速管弯头端部均设有立式轴流泵，所述立式轴流泵出液口与加速管弯头端部密封连接，该立式轴流泵下端的吸入室设于圆锥部，所述立式轴流泵用于将圆锥部内母液通过加速管泵入中心管下端部，加速中心管下端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所述的一种内设加速管的硝酸钾结晶器，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。
  3. 根据权利要求2所述的一种内设加速管的硝酸钾结晶器，其特征在于：所述立式轴流泵固定连接于第一支撑杆上。
  4. 根据权利要求1至3任一项所述的一种内设加速管的硝酸钾结晶器，其特征在于：所述加速管设有4件。
  5. 根据权利要求4所述的一种内设加速管的硝酸钾结晶器，其特征在于：所述加速管管径设为80～90mm。
  6. 根据权利要求4所述的一种内设加速管的硝酸钾结晶器，其特征在于：所述结晶器筒体、溢流箱、中心管、循环管、加速管均采用316不锈钢材质。
  7. 根据权利要求4所述的一种内设加速管的硝酸钾结晶器，其特征在于：所述热交换器采用列管式热交换器。
  8. 根据权利要求4所述的一种内设加速管的硝酸钾结晶器，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。
  9. 根据权利要求4所述的一种内设加速管的硝酸钾结晶器，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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