Chemical Centrifugal Pump: Equipment Commonly Used for Waste Liquid Transportation in the Chemical Industry

# I. Introduction

As a vital pillar industry of China's national economy, the chemical industry has long attracted extensive attention regarding the disposal of waste liquid generated during production processes. Waste liquid contains numerous harmful substances, and improper treatment will cause severe environmental pollution. As key equipment for waste liquid transportation, chemical centrifugal pumps are being applied increasingly widely across the chemical industry. This paper conducts an in-depth analysis and discussion on the application of chemical centrifugal pumps in waste liquid transportation.

# II. Overview of Chemical Centrifugal Pumps

## 1. Definition

A chemical centrifugal pump is mechanical equipment that transports fluids by means of centrifugal force, and it is widely adopted in chemical, petroleum, pharmaceutical, food and other industries. It features simple structure, stable operation, high efficiency and convenient maintenance.

## 2. Working Principle

The working principle of chemical centrifugal pumps relies on the high-speed rotation of the impeller to generate centrifugal force on fluids. Fluids are sucked in through the inlet, accelerated by the impeller and then discharged from the outlet.

## 3. Classification

Chemical centrifugal pumps can be categorized into the following types according to their structure and application purposes:

(1) Single-stage single-suction centrifugal pumps: Suitable for transporting low-viscosity and low-temperature fluids.

(2) Multi-stage single-suction centrifugal pumps: Suitable for transporting fluids requiring high head, low flow rate and high temperature.

(3) Double-suction centrifugal pumps: Suitable for transporting fluids with large flow rate and low head.

(4) Special chemical centrifugal pumps: Suitable for transporting special media containing solid particles, corrosive substances, flammable and combustible components.

# III. Application of Chemical Centrifugal Pumps in Waste Liquid Transportation

## 1. Properties of Waste Liquid

The chemical industry produces a wide variety of waste liquid, mainly including organic waste liquid, inorganic waste liquid, acid and alkaline waste liquid. Such waste liquid possesses the following characteristics:

(1) Relatively high viscosity: Some waste liquid has high viscosity, which exerts certain impacts on the conveying performance of pumps.

(2) Corrosiveness: Certain waste liquid is corrosive, imposing high requirements on pump materials and sealing performance.

(3) Flammability and explosiveness: Some waste liquid is flammable and explosive, demanding high safety standards for pumps.

## 2. Application of Chemical Centrifugal Pumps in Waste Liquid Transportation

It is crucial to select appropriate chemical centrifugal pumps in accordance with the characteristics of chemical waste liquid. Common chemical centrifugal pumps used for waste liquid transportation are listed as follows:

(1) Single-stage single-suction centrifugal pumps: Suitable for transporting low-viscosity and low-temperature organic waste liquid.

(2) Multi-stage single-suction centrifugal pumps: Suitable for transporting inorganic waste liquid requiring high head, low flow rate and high temperature.

(3) Double-suction centrifugal pumps: Suitable for transporting acid and alkaline waste liquid with large flow rate and low head.

(4) Special chemical centrifugal pumps: Suitable for transporting waste liquid containing solid particles, corrosive substances, flammable and combustible special media.

# IV. Precautions for Selecting Chemical Centrifugal Pumps

1. Select appropriate pump models based on the properties of waste liquid.

2. Take parameters including flow rate, head and rotating speed of pumps into consideration to guarantee the pump performance meets transportation requirements.

3. Adopt pump materials with excellent corrosion resistance, wear resistance and sealing performance.

4. Pay attention to the safety performance of pumps, such as explosion protection and anti-corrosion capability.

# V. Conclusion

Chemical centrifugal pumps play a significant role in waste liquid transportation within the chemical industry. Mastering the working principle, classification, application and selection precautions of chemical centrifugal pumps helps enterprises select proper pump models, improve waste liquid treatment efficiency and mitigate environmental pollution. With the continuous tightening of environmental protection policies in China, chemical centrifugal pumps will gain ever broader application in the field of waste liquid transportation.