Industrial Technology China New Technology New Products Application of Energy Saving Technology for Mine Main Drainage System Lei Zhenwei Cui Tianliang (Zhengzhou Coal Industry (Group) Co., Ltd., Zhengzhou, Henan 450042, China) Energy technology methods, through analysis and calculation, formulate energy saving renovation plans, and After the transformation, the operation conditions and energy-saving effects were verified and analyzed. The energy-saving technology methods applicable to the main drainage system of the coal mine were summarized, the safety and reliability of the system were improved, the power consumption was greatly reduced, and safety production and savings were realized. energy.

The main drainage system of mines is an important system for safety production in mines. As the depth of coal mining continues to increase, the influx of mine water and the difficulty of drainage increase. As a result, the requirements for the main drainage system of mines are also getting higher and higher. Increasing the power consumption of the main drainage system of mines has substantially increased, which basically accounts for 20%-40% of the total power consumption of mines. The pressure on production costs of enterprises is huge. And due to the continuous emergence of new equipment, new processes, new technologies, and new materials, the existing equipment and systems are increasingly unable to meet the requirements of safe production, energy conservation, and environmental protection. Therefore, energy saving technology research and transformation of the main drainage system of mines can be performed. Significantly reduce energy consumption, improve system safety and reliability, and have important implications for safe production, energy conservation and environmental protection.

1 The status of the main drainage system of a mine The amount of water inflow is 2700m3/h. The weight of the mine water: Type wear-resistant multi-stage centrifugal water pump, 4 sets of work, 4 spares, and 1 overhaul. Each pump is equipped with a YB2 4-pole 1120kW mine explosion-proof motor. The drainage line uses a 4趟426mm seamless steel pipe drain. Drainage height 419m (water pump suction and mine water treatment station take a total of 15m). The two pump single port 426 Yangyang drain pipe parallel operation operating point parameters: flow rate 1108.6m3 / h, head 501.2m, efficiency 73%, single pump shaft power 1036.4kw. Drainage pump motor powered by the underground substation, in The pump room has a local operation button.

Due to oversized pumps, unreasonable original piping layout, and backward control system, the main drainage system has a low degree of automation, low operating efficiency, and poor reliability. It satisfies the MT/T1002-2006 monitoring method and determination of energy saving in main drainage systems of coal mines. Regulations and opinions on the energy-saving and emission-reduction work in the coal industry, and other relevant policies and regulations concerning energy-saving project implementation plans, must carry out energy-saving reform of the main drainage system.

2.1 Adjust the piping layout to reduce pipeline resistance. By adjusting the diameter and direction of the pipeline, replace the low-resistance pipe fittings and valves, reduce the pipe resistance, change the pipe characteristic curve, and make the system operate in the best working condition.

2.2 cutting pump impeller, change the pump performance curve.

Impeller cutting is a very useful improvement for excessively conservative designs or changes in system load that result in large pump capacities. Impeller cutting is to adjust the diameter of the impeller to reduce the tip speed of the impeller, and thus directly reduce the temperature and humidity of the internal and external temperature and humidity test period of the 10KV traffic police parking lot 141 opening and closing table. Humidity %RH Inside and Outside Temperature Table 2 10kV Traffic Police Parking Lot After Modification 141 Internal and External Humidity Tests at the Opening and Closing Center Humidity at RH Environment RH Humidity Inside and Outside Humidity Difference at HH February 19, 2014 73.269.83.4 March 14, 2014 72.769.53.22014 On April 18th, 83.478.74.7, other measures may be taken for different outdoor RMUs, and no further details will be provided here.

After the renovation, the internal and external humidity measurements were again performed on the 10kV traffic police parking lot 141 opening and closing center (Table 2). According to the data in Table 2, after the modification, the humidity inside and outside the opening and closing center is below 5°%RH, the condensation phenomenon inside the box is obviously controlled, and the water condensation on the top of the box is not found. The mechanism corrosion phenomenon has not deteriorated, and the effect is remarkable.

The promotion of such transformation can effectively alleviate the condensation problem that currently seriously jeopardizes the safety of equipment without affecting the operation of the power grid, prolongs the life of the equipment, and achieves good economic results.

The solution at this stage is only to reduce the humidity by creating natural ventilation conditions, which can play a good role in relieving the condensation problem of the control equipment, but it cannot fundamentally solve the problem of condensation. In the follow-up program improvement, by adding on-line monitoring, solar power generation, 4G communications and other emerging technology applications, real-time monitoring of key equipment can be achieved, data such as temperature and humidity can be collected, and an automatically opened exhaust fan and pumping can be added. Pumps and other equipment. With the large number of applications of outdoor RMUs, the condensation problem will still seriously affect the safety of the equipment. How to solve such problems better and more economically and safely is very important for reducing the occurrence of equipment failures and improving the reliability of power grids. The significance.

Lost Wax Casting is the main technology of investment castings. In most conditions, it can be regarded as Investment Casting. The main process of lost wax castings is: mould design--mould making--wax injection--tree assembly--shell making-dewax-shell roasting-pouring-cleaning-heat treatment-machining-package.

Advantages of lost wax castings:

a, Accuracy: dimension tolerance--CT5~CT7,roughness--Ra2.5~6.3μm,weights range from 10g to 80kg;

b,Surface shape and inner cavity is almost not limited, we could manufacture lost wax castings with minimum wall thickness 0.5mm;

c, Almost all kinds of material can be used, such as steel, aluminum, copper, superalloy and so on.

Disadvantage of lost wax castings:

The production cycle is relatively long and it is not suitable for large products in terms of the features of this kind of process.

Classification of lost wax casting:

1. Sodium silicate casting: large surface roughness, low dimension accuracy with short shell making cycle. The hardening technique is chemical process. Normally most of Carbon Steel Investment Casting and alloy Steel investment casting are made by this kind of lost wax casting process. 

2. Silica sol casting: Small roughness, high dimension accuracy with high material costs and long shell making time. The hardening process of shell is a natural process under certain temperature and humidity. Normally stainless steel investment castings are made by this kind of lost wax casting process.

As a leading manufacturer of lost wax castings, A&M has the experience to produce almost all types of lost wax castings. Most of our lost wax castings are widely used in automotive, aerospace, marine, medical equipment, power plants and other industries

Lost Wax Casting

Silic Sol Castings,Lost Wax Casting,Dimensional Precision Casting,Brass Lost Wax Precision Castings

A&M Manufacturing Co.Ltd. , https://www.am-casting.com