Frame submersible mixer, low-speed frame mixer, chemical mixing mixer manufacturer, neutralization tank mixer

The selection of a frame mixer based on the physical properties, capacity, and mixing purpose of different media can play a significant role in promoting chemical reaction rates and improving production efficiency. The frame mixer is generally used for mixing Congee like materials.

The frame mixer can be regarded as a deformation of the paddle mixer, with a relatively sturdy structure and a large amount of animal material to be stirred. If the shape of the bottom of such a mixer is similar to the shape of the lower head of the reaction vessel, it is usually called an anchor mixer. The diameter of the frame mixer is relatively large, usually taken from the inner diameter of the reactor2/3~9/10, 50~70r/min. When used for low viscosity liquids, the ratio of the blade diameter to the tank diameter of the anchor impeller is 0.7-0.9, and for high viscosity liquids it is 0.8-0.95. The speed is usually 10-50 r/min. The gap between the frame mixer and the reactor wall is small, which is conducive to the heat transfer process. When rotating rapidly, the liquid driven by the mixer blades brings the stationary layer down from the reactor wall; When rotating slowly, a mixer with a scraper can generate good heat conduction. This type of mixer is commonly used for heat transfer, crystallization operations, and mixing of high viscosity liquids, high concentration slurries, and settling slurries.

Anchor and frame mixers belong to the same category, collectively known as anchor frame mixers. In order to increase the mixing range and remove residues or liquid layers from the tank wall, the outer contour of the anchor frame mixer should be close to the inner wall of the mixing tank, and its bottom shape can also be elliptical, conical, etc. to adapt to the contour of the tank bottom. In order to increase the mixing range for high viscosity materials and improve the rigidity of the impeller, it is often necessary to add some vertical blades and crossbeams on the anchor and frame structures, which results in a variety of structural shapes for the anchor frame structure.

IIframeType classification can be roughly divided into anchor type, elliptical frame type, cone bottom frame type, box type, and anchor frame type based on their shapes .

3、 Applicable viscosity

ApplicablecompareHigh viscosity is200-300Pa · s.

4、 Application Fields

Anchor frame mixers typically operate at low speeds and do not generate significant shear forces when mixing low viscosity liquids, making them unsuitable for liquids-Liquid and gas-liquid dispersion. On the other hand, this type of impeller moves at a high flow rate inside the tank, with horizontal swirling flow dominating and lacking good mixing uniformity. However, the flow velocity near the tank wall can achieve a higher heat transfer film coefficient than other impellers, making it commonly used for heat transfer and crystallization operations. In addition, due to the large diameter of the blade and its proximity to the bottom of the tank, it is also commonly used to stir high concentration slurries and precipitating slurries. It is also commonly used for stirring high viscosity fluids.

5、 Flow state

Horizontal circumferential flow at different heights.

6、 Structure

Anchor frame mixer and The connection method of the mixing shaft is similar to that of a paddle type, that is, one end of the impeller connected to the mixing shaft is made into a semi-circular collar, and then the two semi-circular rings of the two sides of the blades are clamped on the mixing shaft with bolts, and the blades are fixed to the mixing shaft with through shaft bolts Mixing shaft. Due to the large external dimensions of the impeller, for ease of assembly and disassembly, most of the blades are connected by bolts, and only small ones are cast or welded. The impeller is mostly made of flat steel and angle steel. In order to improve the strength of the impeller, it can also be made of Reinforced steel plate.

1. Supporting equipment control cabinet and on-site button box (one control one).

The on-site control box is operated by Jiangsu Du'an Environmental ProtectionProvided as a matching item, the control box adopts a perspective double-layer door and stainless steelMade of 304 material, the bracket is also made of stainless steel 304 material, which can be firmly fixed; The thickness of the board shall not be less than 1.5mm, the outdoor protection level shall be IP55, and the indoor protection level shall not be lower than IP4X. Protective switches, control switches, and logic components shall be installed inside the box. The panel shall be equipped with a multifunctional meter, conversion switch, on/off button, emergency stop button, and operation indicator light. When the equipment fails, the operation of the equipment shall be stopped.

Jiangsu Du'an Environmental Protection shall provide a complete electrical control schematic diagram, wiring diagram, electrical component location diagram, specific wiring diagram numbers, and electrical component configuration list for each control box during bidding based on the performance requirements of the equipment provided and the above control requirements.

Must havePrimary components and operational functions such as circuit breakers, AC contactors, thermal relays (if required), and frequency converters (if required), with the main electrical components (circuit breakers, contactors, thermal relays) using Schneider, ABB, or Siemens products.

Reserved in the control cabinetThe wiring terminals connected to the PLC system should be clearly labeled, and the completed control drawings should be provided to enable automatic control of the PLC.

2.7.2 Inverter

The frequency converter adoptsABB ACS880、 Schneider ATV630, Siemens MM440 and other core components adopt imported product brands. The frequency converter needs to be connected to the PLC for control.

(1) All participating manufacturers are required to use high-performance frequency converters, which should include voltage frequency ratio V/F (2-point and 3-point), PG free open-loop vector control, square load control mode, and energy-saving mode within the same frequency converter to facilitate the debugging of the engineering contractor. It is particularly important to point out that in order to demonstrate the energy-saving effect of the frequency converter and meet the national energy-saving policy guidelines, the frequency converter needs to adopt a control method that is suitable for driving the load of the fan pump. Easy to operate and maintain, frequency converters of different powers must be of the same series.

(2) When a non hardware fault occurs in the frequency converter, the frequency converter can choose a shutdown mode (free shutdown/fault shutdown);, Until the fault is resolved, the frequency converter will resume normal control and reduce the number of unexpected shutdowns.

(3) The frequency converter needs to have a password lock function to prevent accidental modification of parameters.

(4) The frequency converter is required to have intermittent automatic jumping function to avoid mechanical resonance, and should have at least 3 jumping frequencies.

(5) The frequency converter has protection functions such as overvoltage, overcurrent, undervoltage, power phase loss, frequency converter overload, frequency converter overheating, motor overload, etc; The protection level shall not be lower than IP20, and it shall be installed in the control cabinet.

(6) The total harmonic current distortion THDI (%) generated by the frequency converter should not exceed 40%; The fundamental current coefficient at the input terminal should not be less than 90% when fully loaded. Under any load condition, the efficiency of the frequency converter should not be less than 0.95, and the power factor should not be less than 0.90 within the speed range of the frequency converter.