Since underground coal mines are highly explosive and dangerous places, the pumps used must be certified by the National Mining Products Safety Marking Center. The main models of underground water pumps for coal mines are MD series of multi-stage pumps for mines. The full range of multi-stage pumps for mines of Zoomlian Pumps has passed the certifications of Coal Safety MA and Coal Safety KA.
Basic Principles for Selection of Underground Water Pumps in Coal Mines
(1) Fully meet the requirements of water supply and drainage design standards. According to the seasonal flow and head, try to make the selected water pump near the design rated operating point when the pump station is designed to operate, so that the pump station's highest and lowest head operating conditions (or adjusted operating conditions) , Within its high efficiency zone. Make sure that the rated flow head of the selected water pump is close to the flow and head actually required by the device. One is to reduce the high margin head; the other is to make the pump run at or close to the rated working condition to save energy and improve the operating efficiency of the pump.
(2) Choose a pump type that has good performance and is compatible with the head and flow changes of the pump station. First of all, we should choose a pump with high wear resistance and high efficiency, good cavitation resistance, and a wide range of applications from the sample of the finalized pump series. When there are multiple pump types to choose from, technical and economic comparisons should be made and the best one should be used. When the series of products cannot meet the requirements, new products can be trial-produced, but model and device tests must be carried out, and they can be adopted after passing the technical appraisal. In pumping stations with large head changes, a pump with a steep drop in the Q-H curve should be used; in pumping stations with large changes in flow, a pump with a gentle Q-H curve should be used.
(3) Select the number of pumps and pipeline settings according to industry requirements, that is, to ensure safety and minimize investment.
(4) It is convenient for operation scheduling, maintenance and management.
(5) For cascade pumping stations, the model and number of pumps should meet the flow coordination requirements of the upper and lower pumping stations, and try to avoid or reduce accidents caused by improper flow coordination.
(6) Where necessary, try to accommodate the requirements of comprehensive utilization.
(7) The total drainage capacity that the selected coal mine underground pump must have.
1) When the water is gushing normally, the total drainage capacity of the working water pump must be: QB=24qz/20=1.2 qz≈1.2×157≈188.4m3/h Qmax=24qmax/20=1.2 qmax≈1.2×200≈240m3/ h
2) Estimate of the required head of the pump: HB=Hsy/ng≈120/ 0.8≈150m
3). Pre-select the type and number of stages of the pump: According to the above parameters, select the pump from the pump products. It is best that one pump can achieve the required drainage capacity. Due to the high content of cement sand in the mine, the MD type wear-resistant multistage centrifugal pump should be selected. According to the classification of water pump products, the Machinery Transportation Division recommends the use of the MD280-43×4 wear-resistant multi-stage centrifugal pump for mining. The power of this pump is 200KW, the head is 172m, the flow is 280m3/h, the efficiency is about 77%, and the weight is 907kg.
4) The number of water pumps required: According to the "Coal Mine Safety Regulations", the capacity of the standby water pump should not be less than 70% of the capacity of the working water pump, and the total capacity of the working water pump and the standby water pump should be able to discharge the maximum of 24 hours in the mine within 20 hours. Water inflow. The ability to overhaul the pump should not be less than the working water
