In order to improve the efficiency of gas drainage before and during longwall extraction,a waterjet rotary cutting system has been developed for in-seam cross panel methane drainage.The purpose of the water rotary cut...In order to improve the efficiency of gas drainage before and during longwall extraction,a waterjet rotary cutting system has been developed for in-seam cross panel methane drainage.The purpose of the water rotary cutting system developed was to create artificial fractures along the gas drainage boreholes.During the design of the system,it was perceived that the nozzle geometry is one of the key factors,affecting cutting capacity.Therefore,we studied the structural and geometric parameters of the nozzle and optimized its performance during laboratory tests and numerical simulation.Underground trials conducted in a coal mine,indicate that production of gas drainage before and after cutting significantly increased by up to three times.The advantages of waterjet assisted gas drainage method has been identified as:1) increasing gas drainage efficiency,2) a possible development of a gas drainage fractured network within coal seams associated with panel extraction,and 3) reducing the risk of exceeding gas limits during longwalling.展开更多
With the continuous development of society,the dyeing and finishing field is transitioning towards green sustainability and multifunctionality.The main direction is to dye fabrics using natural dyes with the aid of mo...With the continuous development of society,the dyeing and finishing field is transitioning towards green sustainability and multifunctionality.The main direction is to dye fabrics using natural dyes with the aid of mordants.In recent years,the technology of biological mordant dyeing with natural dyes has become a research hotspot.This paper first discusses in detail the application of biological mordant technology with natural dyes on various types of dyed fabrics,including plant fibers,animal fibers,and synthetic fibers.It then introduces the application of biological mordant dyeing with natural dyes in fields such as antibacterial and ultraviolet protection.By comparing the environmental impact and effectiveness of metal mordants versus biological mordants on dyed fabrics,the most suitable mordant is identified.Finally,the paper provides an outlook on the optimization of the dyeing process,in-depth exploration of mechanisms,rational selection of resources,and functional application trends of biological mordant technology with natural dyes,aiming to provide a reference for research directions in this field.展开更多
基金support provided by the Shenhua Ningxia Coal Group Without this assistance,the project would have been difficult to carry out.
文摘In order to improve the efficiency of gas drainage before and during longwall extraction,a waterjet rotary cutting system has been developed for in-seam cross panel methane drainage.The purpose of the water rotary cutting system developed was to create artificial fractures along the gas drainage boreholes.During the design of the system,it was perceived that the nozzle geometry is one of the key factors,affecting cutting capacity.Therefore,we studied the structural and geometric parameters of the nozzle and optimized its performance during laboratory tests and numerical simulation.Underground trials conducted in a coal mine,indicate that production of gas drainage before and after cutting significantly increased by up to three times.The advantages of waterjet assisted gas drainage method has been identified as:1) increasing gas drainage efficiency,2) a possible development of a gas drainage fractured network within coal seams associated with panel extraction,and 3) reducing the risk of exceeding gas limits during longwalling.
基金College Student Innovation and Entrepreneurship Training Program Project(X202413561129)。
文摘With the continuous development of society,the dyeing and finishing field is transitioning towards green sustainability and multifunctionality.The main direction is to dye fabrics using natural dyes with the aid of mordants.In recent years,the technology of biological mordant dyeing with natural dyes has become a research hotspot.This paper first discusses in detail the application of biological mordant technology with natural dyes on various types of dyed fabrics,including plant fibers,animal fibers,and synthetic fibers.It then introduces the application of biological mordant dyeing with natural dyes in fields such as antibacterial and ultraviolet protection.By comparing the environmental impact and effectiveness of metal mordants versus biological mordants on dyed fabrics,the most suitable mordant is identified.Finally,the paper provides an outlook on the optimization of the dyeing process,in-depth exploration of mechanisms,rational selection of resources,and functional application trends of biological mordant technology with natural dyes,aiming to provide a reference for research directions in this field.
