In small workplaces, the complexity of poisonous dust risk, poor ventilation, and terrible environmental hazards threaten the people working within the space. The following technologies and theories are essential in tackling such problems:

(1) Coal mine dust control

The working space of mine evacuation is narrow with complex dust sources, threatening workers. Moreover, the poor hydrophobicity of water injection coal seam would further deteriorate the risky situation to a large extent. The solution consists of:

 Developing a series of compound wetting agents, which are efficient and environmental-sound.

 Developing the high-pressure impulsive water injection technique and automatically adding wetting agent into the coal mine.

 Develop the systematic facility employed in fully-mechanized coal faces, which integrate continuous dust monitoring module, dust sources tracking module with spray dust removal system.

 Optimize the dust removal and ventilation system; develop complete sets with continuous monitoring of dust in large section comprehensive excavation face and intelligent system for wind and water adjustment.

(2) Dust and poisonous gas control in metal-nonmetal mines

The processes of metal-nonmetal excavation concern heavy dust contamination and inadequate prevention effectiveness. The solution refers following aspects:

 Study the theoretical system of in metal-nonmetal mining process.

 Develop the intelligent dust control technology and facilities of unloading ore with multi-levels and high ore pass.

 Develop the efficient, environmental-sound chemical suppressant employed in blasting dust. Moreover, develop the relevant dispensing and adding techniques.

 Develop the intelligent dust removal device (based on air-water control spray technique), micron dry mist dust suppression device, and a novel efficient microporous membrane filter.

(3) Cooling in high-temperature mine and tunnel excavation

Due to the extreme depth and high temperature working ambient due to wall rock and limited workplace, the problem with the mine and tunnel are prominent. The solution contains:

 Identify the heat sources within high-temperature mines and tunnels, and explore the mechanism of heat hazards formation.

 Set up the exothermal computational model of each source and the analog model of thermal exchange between wind flow and wall rock.

 Study the temperature distribution law of the wall rock across high-temperature mines and tunnels, and set up the predictive model.

 Develop the non-artificial cooling materials and technology by considering the applicability of ventilation cooling and spray cooling methods under various working ambient.

(4) Environmental governance of shotcrete operation in limited space

The working space for shotcrete is limited with enormous dust, making dust control difficult. The following solutions are being undertaken:

 Set up the models for predicting the producing dust capability and visualized model of dust movement.

 Develop the novel dust suppression admixture and shotcrete dust purifying equipment.

 Reveal the shotcrete spraying and bouncing trajectory mechanism by illustrating the materials' distribution, movement, and pulverization process.

(5) Industrial ventilation and dust & poisonous gases removal

 Set up the dynamic hazardous gases distribution model for industrial workplaces by studying dust and poisonous gases' causation and impact factors.

 Optimize the current industrial ventilation strategy by studying the distribution of dust and poisonous gases under different ventilation statuses.

 Develop relevant, intelligent monitoring and control technologies and facilities upon researching the mechanism of hazardous dust and poisonous gases controlling.