Research On Formation System Of High Pressure Bursting Foam

The high-pressure foam cracking and rock breaking method is mainly used for hard rock crushing.Compared with the current drilling and blasting method used in the roadway,it has the advantages of large rock hardness,low input,high work efficiency and low dust.The method utilizes the characteristics of high pressure foam compressibility,strong viscosity and low water consumption,and rock crushing resistance,which is a non-explosive,non-combustion rock breaking method,and its power is controllable and clean.Environmental protection.One of the key technologies of high-pressure foam cracking and rock breaking method is the generation and supercharging of the rising foam.Therefore,this paper mainly studies the high-pressure foam generating system and the supercharging device for the cracking.Based on the closed-loop PID feedback control method,the overall scheme of the foam generation system is designed,which mainly includes the hardware and software parts of the system.In the hardware design part,introduce the analog expansion module of the system controller PLC,determine the sensor D/I conversion method,clarify the selection of pumps,air compressors,etc.,and establish a threedimensional model;in the software design part,determine the system The control method is designed and the control interface is designed to perform a logical relationship judgment on the one-key start function.Based on the VOF two-phase flow model method,the fluid simulation of the key foamer in the foam generation system is carried out.The foamer design is carried out by using the baffle diffusion principle.The foamer is modeled and structured by the ICEM CFD.Dividing and generating a high-quality grid with an average mass of Qm=0.98,using FLUENT to simulate the simulation,the diffusion angle of the different combination spoilers and the throat polymerization angle are set as variables with the maximum influence of the mixing effect,and the pressure in the foamer is analyzed.The velocity cloud diagram analyzes the pressure gradient of the central axis,the velocity profile of the outlet section and the phase diagram of the flow field to obtain the optimal structural parameters of the foamer.Comparing the three forms of the supercharger,the supercharged mode of the double-acting supercharger is determined due to the high pressure of the reciprocating supercharger and the convenient control.According to the use requirements of the foam cracking and breaking rock,the supercharging ratio of the supercharger and the overall parameters are calculated.Aiming at the structural characteristics of the variable gap seal at the high pressure chamber of the key part,the orthogonal experiment design was used to carry out the simulation study to determine the structural parameters of the variable gap seal.By analyzing the rigidflexible impact buffer analysis,it is concluded that the steel-rubber contact surface can act as a shock absorbing buffer.Amesim hydraulic simulation analysis of the supercharged system shows that the increase of the pressurized volume increases the output flow and the pulsation increases but the recovery time does not differ much.When the system pressure increases,the system pressure stabilization time becomes longer.The foaming system was used to evaluate the mixing quality of the foaming system,and the three-factor four-level orthogonal experiment was used to analyze the range,variance and factor level.The high-speed image particle acquisition system was used to analyze the flow pattern distribution in the foam generation system and the flow velocity of the outlet foam in the tube.The commutation time and peak pressure of the supercharger are tested.The results show that the higher the supply pressure,the shorter and more stable the commutation time,and the pressure peak test can reach the theoretical maximum safety pressure of 45 MPa.The experimental and design requirements are consistent.