Water coal slurry pump from China

In the field of industrial transportation, coal-water slurry, as an efficient and clean fuel medium, the reliability and adaptability of its conveying equipment directly affect production efficiency. The AH series coal-water slurry pump, as a representative product among centrifugal slurry pumps, with its comprehensive performance design, is widely used in heavy-duty working conditions such as mining, chemical industry, and electric power, especially in the continuous transportation of high-abrasive, high-density coal-water slurry. This article will comprehensively analyze the core advantages of the AH series coal-water slurry pump from the aspects of structural characteristics, technical advantages, sealing system and application scenarios.

The AH series coal-water slurry pump is a horizontal, cantilever, single-stage centrifugal slurry pump, specially designed to solve the problem of conveying high-concentration coal-water slurry (with high concentration of solid particles and strong abrasiveness). Its core design concept is to meet the continuous operation requirements under heavy industrial scenarios by strengthening structural stability and wear resistance - whether it is mine mill discharge, power plant ash treatment, or abrasive slurry transportation in the chemical industry, it can maintain efficient and reliable operation.

The structural design of the AH series coal-water slurry pump revolves around the three core goals of "wear resistance, easy maintenance, and high stability". The key structural characteristics are as follows:

Adopting a horizontal cantilever layout, one end of the pump shaft is connected to the motor, and the other end cantilever supports the impeller, without the need for additional intermediate bearings, simplifying the structural complexity. The single-stage impeller design ensures that the flow path of the medium in the pump cavity is short and direct, reducing particle deposition and wear caused by complex flow paths. At the same time, the pump body adopts a volute structure, and through the gradual flow path design, the kinetic energy transmitted by the impeller is efficiently converted into static pressure energy, improving the delivery pressure and efficiency.

The high abrasiveness and high concentration of coal-water slurry put strict requirements on the sealing system of the pump - it is necessary to prevent medium leakage (avoid environmental pollution and material loss) and resist the wear of the sealing parts by particles. The AH series coal-water slurry pump provides three sealing schemes, which can be flexibly selected according to specific working conditions:

Packing seal is a traditional sealing scheme for rotating shafts. It forms a labyrinth seal structure by filling elastic sealing materials (such as oil-impregnated asbestos, aramid fiber, Teflon) between the shaft sleeve and the stuffing box. The packing seal design of the AH series has two major optimizations:

The advantage of this scheme is simple structure and convenient maintenance, which is suitable for most coal-water slurry transportation scenarios, especially for working conditions that do not require extreme sealing but need frequent maintenance.

"Oil press seal" (also known as "auxiliary impeller seal") is a non-contact sealing scheme. Its core principle is that the auxiliary impeller at the rear of the impeller rotates to generate centrifugal force to form a pressure barrier to prevent coal-water slurry from leaking to the shaft end. At the same time, it is combined with gland seal or lip seal as an auxiliary to form double protection.

The unique advantage of this scheme is that it does not rely on flushing water, and is suitable for the following scenarios:

The auxiliary impeller rotates synchronously with the main impeller, with no contact wear, long service life, simple structure and low maintenance cost.

For high-pressure (outlet pressure ≥ 1.6MPa) or scenarios with strict requirements on leakage control (such as food-grade coal-water slurry transportation), the AH series can be equipped with anti-leakage mechanical seals. Its core is to form a sealing surface through the precise fitting of the moving ring and the static ring (surface roughness Ra ≤ 0.2μm), and cooperate with the spring compensation mechanism to ensure that the end faces are always in close contact to prevent medium leakage.

The comprehensive performance of the AH series coal-water slurry pump makes it a core conveying equipment in many industrial fields, especially in scenarios related to coal-water slurry:

In the coal-water slurry production line, the AH series pump undertakes two key tasks:

In river dredging and lake dredging projects, the AH pump can transport mud with high sand content (sand particle diameter ≤ 50mm). With wear-resistant high-chromium alloy wet parts and large flow design (some models can reach a flow rate of more than 1000m³/h), it can efficiently complete sediment transfer and accumulation operations.

Through targeted structural design and material selection, the AH series coal-water slurry pump is perfectly adapted to the transportation needs of high-abrasive and high-density coal-water slurry. Its core competitiveness is reflected in:

Whether it is coal-water slurry fuel transportation in the coal industry, or heavy-duty slurry treatment in electric power and mining, the AH series coal-water slurry pump, with its characteristics of "high efficiency, reliability and easy maintenance", has become a key equipment in the industrial transportation field, providing stable solutions for medium transportation under complex working conditions.