To solve the problem of water injection in lowporosity and lowpermeability coal seams, a new idea of liquid CO 2 cyclic cold soaking to improve the water absorption and wetting efficiency of coal is proposed. The evolution of the pore structure and mechanical properties of coal were studied using lowfield nuclear magnetic resonance and uniaxial compression tests.
WhatsApp: +86 18203695377
Coal seam water injection is vital in mitigating dust pollution in coal mining operations. To investigate water imbibition and adsorption behavior on the coal surface following injection into coal seams, as well as the impact of surfactants, coal particles with sizes of 68 mm, 35 mm, and mm were selected from the Dongtan Coal Mine in Shandong Province, China.
WhatsApp: +86 18203695377
Coal accounts for approximately 60% of China's primary energy and is an important part of the energy structure (Li et al. 2015; Zhou et al. 2020b).The clean energy produced by the coal chemical process has less environmental pollution than direct combustion (Chen et al. 2020; Guo et al. 2020).Therefore, there will still be a large demand for coal in the future.
WhatsApp: +86 18203695377
Introduction. During integrated steelmaking, coal is typically used in the blast furnace to offset the use of metallurgical coke as a fuel as it is more costeffective particularly with the global scale extreme pressures on coke at present, the EU has enlisted coke as a critical material [Citation 1].The amount at which the coke can be offset is highly dependent on the chemistry of the coal.
WhatsApp: +86 18203695377
The process of water injection in coal seams describes the permeation behavior caused by the action of ground stress and water injection pressure. To study how ground stress and water injection pressure affect water expansion in the coal seam, based on the correlation between the electrical conductivity of coal and its water content, this study designs a coal humidity detection system that ...
WhatsApp: +86 18203695377
The PIPR in the 1 m 3 chamber with one pressurized dust container was with 115 mbar lower than the PIPRs in the 20Lsphere (see Fig. 3).In cases with higher dust amounts two dust containers can be used so theoretically the PIPR may be around 200 mbar. For the reported values of p max this means, the explosion pressures may be 10 % to 20 % higher than if they were measured under ambient pressure.
WhatsApp: +86 18203695377
A large amount of dust will be produced in the process of mine production and construction. Coal dust has great harmfulness, endangering human health, accelerating the wear of mechanical equipment, polluting the mining environment, and even inducing coal dust explosion accidents [3], [4], [5].
WhatsApp: +86 18203695377
Although VACUMAX does produce electric vacuums designed for Class II, Division 2 environments, the most economical solution for cleaning combustible fugitive coal dust is the company's air ...
WhatsApp: +86 18203695377
Other dust recovery techniques applied in pyrometallurgical processes are pelletizing and submerged injection [8], [9]. This work uses data analytics techniques to gain insight into the operation before and after dust insufflation in the rotary kiln furnace of a 180 t h −1 RKEF ferronickel production process.
WhatsApp: +86 18203695377
Surfactant can improve the wettability of water to coal, which is beneficial to reduce the production of coal dust in coal seam water injection. Through the measurement and calculation of contact angle and its decay rate, the wettability differences of SDS (C12H25OSO3Na), AES (C14H29O5NaS), OP10 (C18H30O10), and JFC (RO(CH2CH2O)nH) to anthracite were compared. In addition, the wetting ...
WhatsApp: +86 18203695377
Coal seam water injection is one of the important means of mine disaster prevention, which helps to restrain the production of dust and reduce gas concentration. Ionic surfactant can change the capillary force of water in coal pore fissures, so as to enhance the wetting effect of coal seam water injection. However, the research on the effect of surfactant on the seepage process is still ...
WhatsApp: +86 18203695377
process onengine combustion was emphasized, and subsequentprogress indiesel engine development has been largely dependent upon improvements infuel injection. Fig. 1. Coal dust injection system of Rudolph Diesel. AIR INJECTION (After patent No. 54286 of 1895.) The operating principle ofmost air injection systems has been similar to the one
WhatsApp: +86 18203695377
In the process of coal mining, a large amount of methane is emitted into the atmosphere every year, which enhances the greenhouse effect of the atmosphere. ... This paper lays a theoretical and experimental foundation for the development of a new technology for coal seam water injection dust prevention. View all citing articles on Scopus. View ...
WhatsApp: +86 18203695377
ACS ACS Publications CEN CAS Find my institution Log In Quick View Share Share on Facebook Twitter WeChat Linked In Reddit Email All Publications/Website OR SEARCH CITATIONS
WhatsApp: +86 18203695377
Coal seam water injection is proved an effective method for preventing coal and gas outburst. However, the poor wettability of coal seam has resulted in poor effect of coal seam water injection in preventing coal and gas outburst. In addition, the coal seam is in a state of injecteduninjected cycle due to multiple water injection. Therefore, it is important to study the wettability of coal ...
WhatsApp: +86 18203695377
Relying on a crosslayer extraction borehole, coal seam water injection efficiency extraction and highefficiency water injection dust prevention can be performed in the later stage of borehole extraction, enabling onehole multipurpose and "gaspowder" integrated prevention and control.
WhatsApp: +86 18203695377
Coal briquettes. During the production of coal briquettes, coal dust is mixed with starch paste and water before heating and compression into an ovoid shape. The starch provides structural support to the briquette shape and ensures that the structure is maintained during transport of the briquette to the oven on the conveyor belt.
WhatsApp: +86 18203695377
1. Introduction. Coal will remain dominant in energy supply in the short term from the perspective of China's resource endowment characteristics and current social and economic development needs [1], [2].The "dual carbon goals" of achieving peak carbon emissions before 2030 and carbon neutrality by 2060, has been raised as China's national strategy, and the coal industry will usher in ...
WhatsApp: +86 18203695377
Among them, the coal dust injection diffusion system uses a. diffuser to form a coal dust cloud. In order to avoid the ... The study found that during the ignition process of coal dust clouds ...
WhatsApp: +86 18203695377
Water infusion is the process of injecting water with or without surfactant under a certain pressure into the coal seam ahead of working face.
WhatsApp: +86 18203695377
To further enhance the impact of water injection and dust reduction in the deep mining process of the coal mine, an efficient dust suppressant for water injection was synthesized by coupling a chelating agent and a surfactant. The optimal composition solution was determined by surface tension, pretreatment settling time and contact angle.
WhatsApp: +86 18203695377
Coal seam water injection technology is widely used in most coal mines at home and abroad, and it is a basic dustproof measure in coal mining face (Wu et al., 2012). Coal seam water injection can achieve the purpose of wetting coal in advance, which can reduce the dust produced at the source in the process of mining.
WhatsApp: +86 18203695377
يرغب أحد موردي المواد من بلجيكا في إنتاج مسحوق الحجر الجيري لملابسه...
الهند غنية بالموارد المعدنية المختلفة وهي سوق مهم لمعالجة المعادن
Copyright © 2023 GMC Co., Ltd. SiteMap
